Mercurial > cpython-lru_cache-weakref

annotate Lib/argparse.py @ 71285:8bc9dbc61ba6 3.2

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Issue #12326: document the recommended idiom for checking sys.platform on Unix systems. Also, point to the various alternatives.
author Antoine Pitrou <solipsis@pitrou.net>
date Sat, 09 Jul 2011 15:54:23 +0200
parents 69ab5251f3f0
children 8e57b5d8f58f 1f3f6443810a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # Author: Steven J. Bethard <steven.bethard@gmail.com>.
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2
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3 """Command-line parsing library
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4
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5 This module is an optparse-inspired command-line parsing library that:
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6
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7 - handles both optional and positional arguments
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8 - produces highly informative usage messages
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9 - supports parsers that dispatch to sub-parsers
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10
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11 The following is a simple usage example that sums integers from the
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12 command-line and writes the result to a file::
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13
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14 parser = argparse.ArgumentParser(
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15 description='sum the integers at the command line')
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16 parser.add_argument(
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17 'integers', metavar='int', nargs='+', type=int,
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18 help='an integer to be summed')
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19 parser.add_argument(
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20 '--log', default=sys.stdout, type=argparse.FileType('w'),
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21 help='the file where the sum should be written')
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22 args = parser.parse_args()
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23 args.log.write('%s' % sum(args.integers))
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24 args.log.close()
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25
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26 The module contains the following public classes:
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27
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28 - ArgumentParser -- The main entry point for command-line parsing. As the
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29 example above shows, the add_argument() method is used to populate
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30 the parser with actions for optional and positional arguments. Then
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31 the parse_args() method is invoked to convert the args at the
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32 command-line into an object with attributes.
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33
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34 - ArgumentError -- The exception raised by ArgumentParser objects when
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35 there are errors with the parser's actions. Errors raised while
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36 parsing the command-line are caught by ArgumentParser and emitted
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37 as command-line messages.
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38
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39 - FileType -- A factory for defining types of files to be created. As the
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40 example above shows, instances of FileType are typically passed as
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41 the type= argument of add_argument() calls.
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42
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43 - Action -- The base class for parser actions. Typically actions are
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44 selected by passing strings like 'store_true' or 'append_const' to
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45 the action= argument of add_argument(). However, for greater
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46 customization of ArgumentParser actions, subclasses of Action may
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47 be defined and passed as the action= argument.
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48
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49 - HelpFormatter, RawDescriptionHelpFormatter, RawTextHelpFormatter,
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50 ArgumentDefaultsHelpFormatter -- Formatter classes which
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51 may be passed as the formatter_class= argument to the
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52 ArgumentParser constructor. HelpFormatter is the default,
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53 RawDescriptionHelpFormatter and RawTextHelpFormatter tell the parser
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54 not to change the formatting for help text, and
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55 ArgumentDefaultsHelpFormatter adds information about argument defaults
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56 to the help.
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57
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58 All other classes in this module are considered implementation details.
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59 (Also note that HelpFormatter and RawDescriptionHelpFormatter are only
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60 considered public as object names -- the API of the formatter objects is
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61 still considered an implementation detail.)
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62 """
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63
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64 __version__ = '1.1'
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65 __all__ = [
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66 'ArgumentParser',
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67 'ArgumentError',
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68 'ArgumentTypeError',
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69 'FileType',
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70 'HelpFormatter',
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71 'ArgumentDefaultsHelpFormatter',
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72 'RawDescriptionHelpFormatter',
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73 'RawTextHelpFormatter',
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74 'Namespace',
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75 'Action',
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76 'ONE_OR_MORE',
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77 'OPTIONAL',
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78 'PARSER',
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79 'REMAINDER',
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80 'SUPPRESS',
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81 'ZERO_OR_MORE',
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82 ]
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84
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74f9ed48ae5d Issue #9026: Fix order of argparse sub-commands in help messages.
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85 import collections as _collections
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86 import copy as _copy
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87 import os as _os
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88 import re as _re
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89 import sys as _sys
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90 import textwrap as _textwrap
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91
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92 from gettext import gettext as _, ngettext
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94
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95 def _callable(obj):
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96 return hasattr(obj, '__call__') or hasattr(obj, '__bases__')
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98
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99 SUPPRESS = '==SUPPRESS=='
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100
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101 OPTIONAL = '?'
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102 ZERO_OR_MORE = '*'
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103 ONE_OR_MORE = '+'
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104 PARSER = 'A...'
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105 REMAINDER = '...'
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106 _UNRECOGNIZED_ARGS_ATTR = '_unrecognized_args'
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107
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108 # =============================
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109 # Utility functions and classes
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110 # =============================
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111
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112 class _AttributeHolder(object):
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113 """Abstract base class that provides __repr__.
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114
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115 The __repr__ method returns a string in the format::
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116 ClassName(attr=name, attr=name, ...)
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117 The attributes are determined either by a class-level attribute,
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118 '_kwarg_names', or by inspecting the instance __dict__.
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119 """
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120
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121 def __repr__(self):
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122 type_name = type(self).__name__
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123 arg_strings = []
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124 for arg in self._get_args():
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125 arg_strings.append(repr(arg))
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126 for name, value in self._get_kwargs():
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127 arg_strings.append('%s=%r' % (name, value))
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128 return '%s(%s)' % (type_name, ', '.join(arg_strings))
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129
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130 def _get_kwargs(self):
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131 return sorted(self.__dict__.items())
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132
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133 def _get_args(self):
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134 return []
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135
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136
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137 def _ensure_value(namespace, name, value):
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138 if getattr(namespace, name, None) is None:
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139 setattr(namespace, name, value)
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140 return getattr(namespace, name)
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141
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142
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143 # ===============
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144 # Formatting Help
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145 # ===============
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146
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147 class HelpFormatter(object):
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148 """Formatter for generating usage messages and argument help strings.
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149
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150 Only the name of this class is considered a public API. All the methods
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151 provided by the class are considered an implementation detail.
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152 """
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153
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154 def __init__(self,
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155 prog,
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156 indent_increment=2,
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157 max_help_position=24,
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158 width=None):
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159
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160 # default setting for width
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161 if width is None:
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162 try:
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163 width = int(_os.environ['COLUMNS'])
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164 except (KeyError, ValueError):
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165 width = 80
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166 width -= 2
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167
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168 self._prog = prog
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169 self._indent_increment = indent_increment
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170 self._max_help_position = max_help_position
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171 self._width = width
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172
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173 self._current_indent = 0
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174 self._level = 0
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175 self._action_max_length = 0
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176
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177 self._root_section = self._Section(self, None)
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178 self._current_section = self._root_section
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179
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180 self._whitespace_matcher = _re.compile(r'\s+')
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181 self._long_break_matcher = _re.compile(r'\n\n\n+')
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182
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183 # ===============================
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184 # Section and indentation methods
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185 # ===============================
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186 def _indent(self):
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187 self._current_indent += self._indent_increment
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188 self._level += 1
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189
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190 def _dedent(self):
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191 self._current_indent -= self._indent_increment
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192 assert self._current_indent >= 0, 'Indent decreased below 0.'
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193 self._level -= 1
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194
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195 class _Section(object):
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196
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197 def __init__(self, formatter, parent, heading=None):
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198 self.formatter = formatter
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199 self.parent = parent
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200 self.heading = heading
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201 self.items = []
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202
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203 def format_help(self):
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204 # format the indented section
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205 if self.parent is not None:
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206 self.formatter._indent()
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207 join = self.formatter._join_parts
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208 for func, args in self.items:
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209 func(*args)
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210 item_help = join([func(*args) for func, args in self.items])
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211 if self.parent is not None:
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212 self.formatter._dedent()
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213
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214 # return nothing if the section was empty
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215 if not item_help:
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216 return ''
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217
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218 # add the heading if the section was non-empty
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219 if self.heading is not SUPPRESS and self.heading is not None:
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220 current_indent = self.formatter._current_indent
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221 heading = '%*s%s:\n' % (current_indent, '', self.heading)
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222 else:
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223 heading = ''
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224
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225 # join the section-initial newline, the heading and the help
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226 return join(['\n', heading, item_help, '\n'])
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227
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228 def _add_item(self, func, args):
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229 self._current_section.items.append((func, args))
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230
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231 # ========================
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232 # Message building methods
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233 # ========================
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234 def start_section(self, heading):
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235 self._indent()
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236 section = self._Section(self, self._current_section, heading)
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237 self._add_item(section.format_help, [])
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238 self._current_section = section
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239
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240 def end_section(self):
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241 self._current_section = self._current_section.parent
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242 self._dedent()
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243
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244 def add_text(self, text):
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245 if text is not SUPPRESS and text is not None:
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246 self._add_item(self._format_text, [text])
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247
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248 def add_usage(self, usage, actions, groups, prefix=None):
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249 if usage is not SUPPRESS:
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250 args = usage, actions, groups, prefix
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251 self._add_item(self._format_usage, args)
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252
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253 def add_argument(self, action):
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254 if action.help is not SUPPRESS:
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255
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256 # find all invocations
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257 get_invocation = self._format_action_invocation
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258 invocations = [get_invocation(action)]
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259 for subaction in self._iter_indented_subactions(action):
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260 invocations.append(get_invocation(subaction))
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261
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262 # update the maximum item length
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263 invocation_length = max([len(s) for s in invocations])
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264 action_length = invocation_length + self._current_indent
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265 self._action_max_length = max(self._action_max_length,
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266 action_length)
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267
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268 # add the item to the list
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269 self._add_item(self._format_action, [action])
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270
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271 def add_arguments(self, actions):
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272 for action in actions:
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273 self.add_argument(action)
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274
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275 # =======================
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276 # Help-formatting methods
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277 # =======================
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278 def format_help(self):
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279 help = self._root_section.format_help()
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280 if help:
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281 help = self._long_break_matcher.sub('\n\n', help)
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282 help = help.strip('\n') + '\n'
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283 return help
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284
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285 def _join_parts(self, part_strings):
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286 return ''.join([part
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287 for part in part_strings
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288 if part and part is not SUPPRESS])
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289
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290 def _format_usage(self, usage, actions, groups, prefix):
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291 if prefix is None:
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292 prefix = _('usage: ')
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293
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294 # if usage is specified, use that
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295 if usage is not None:
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296 usage = usage % dict(prog=self._prog)
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297
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298 # if no optionals or positionals are available, usage is just prog
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299 elif usage is None and not actions:
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300 usage = '%(prog)s' % dict(prog=self._prog)
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301
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302 # if optionals and positionals are available, calculate usage
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303 elif usage is None:
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304 prog = '%(prog)s' % dict(prog=self._prog)
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305
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306 # split optionals from positionals
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307 optionals = []
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308 positionals = []
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309 for action in actions:
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310 if action.option_strings:
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311 optionals.append(action)
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312 else:
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313 positionals.append(action)
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314
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315 # build full usage string
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316 format = self._format_actions_usage
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317 action_usage = format(optionals + positionals, groups)
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318 usage = ' '.join([s for s in [prog, action_usage] if s])
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319
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320 # wrap the usage parts if it's too long
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321 text_width = self._width - self._current_indent
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322 if len(prefix) + len(usage) > text_width:
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323
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324 # break usage into wrappable parts
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325 part_regexp = r'\(.*?\)+|\[.*?\]+|\S+'
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326 opt_usage = format(optionals, groups)
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327 pos_usage = format(positionals, groups)
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328 opt_parts = _re.findall(part_regexp, opt_usage)
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329 pos_parts = _re.findall(part_regexp, pos_usage)
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330 assert ' '.join(opt_parts) == opt_usage
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331 assert ' '.join(pos_parts) == pos_usage
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332
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333 # helper for wrapping lines
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334 def get_lines(parts, indent, prefix=None):
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335 lines = []
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336 line = []
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337 if prefix is not None:
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338 line_len = len(prefix) - 1
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339 else:
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340 line_len = len(indent) - 1
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341 for part in parts:
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342 if line_len + 1 + len(part) > text_width:
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343 lines.append(indent + ' '.join(line))
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344 line = []
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345 line_len = len(indent) - 1
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346 line.append(part)
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347 line_len += len(part) + 1
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348 if line:
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349 lines.append(indent + ' '.join(line))
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350 if prefix is not None:
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351 lines[0] = lines[0][len(indent):]
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352 return lines
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353
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354 # if prog is short, follow it with optionals or positionals
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355 if len(prefix) + len(prog) <= 0.75 * text_width:
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356 indent = ' ' * (len(prefix) + len(prog) + 1)
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357 if opt_parts:
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358 lines = get_lines([prog] + opt_parts, indent, prefix)
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359 lines.extend(get_lines(pos_parts, indent))
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360 elif pos_parts:
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361 lines = get_lines([prog] + pos_parts, indent, prefix)
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362 else:
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363 lines = [prog]
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364
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365 # if prog is long, put it on its own line
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366 else:
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367 indent = ' ' * len(prefix)
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368 parts = opt_parts + pos_parts
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369 lines = get_lines(parts, indent)
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370 if len(lines) > 1:
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371 lines = []
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372 lines.extend(get_lines(opt_parts, indent))
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373 lines.extend(get_lines(pos_parts, indent))
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374 lines = [prog] + lines
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375
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376 # join lines into usage
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377 usage = '\n'.join(lines)
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378
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379 # prefix with 'usage:'
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380 return '%s%s\n\n' % (prefix, usage)
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381
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382 def _format_actions_usage(self, actions, groups):
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383 # find group indices and identify actions in groups
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384 group_actions = set()
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385 inserts = {}
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386 for group in groups:
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387 try:
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388 start = actions.index(group._group_actions[0])
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389 except ValueError:
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390 continue
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391 else:
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392 end = start + len(group._group_actions)
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393 if actions[start:end] == group._group_actions:
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394 for action in group._group_actions:
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395 group_actions.add(action)
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396 if not group.required:
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397 if start in inserts:
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398 inserts[start] += ' ['
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399 else:
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400 inserts[start] = '['
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401 inserts[end] = ']'
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402 else:
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403 if start in inserts:
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404 inserts[start] += ' ('
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405 else:
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406 inserts[start] = '('
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407 inserts[end] = ')'
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408 for i in range(start + 1, end):
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409 inserts[i] = '|'
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410
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411 # collect all actions format strings
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412 parts = []
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413 for i, action in enumerate(actions):
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414
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415 # suppressed arguments are marked with None
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416 # remove | separators for suppressed arguments
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417 if action.help is SUPPRESS:
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418 parts.append(None)
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419 if inserts.get(i) == '|':
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420 inserts.pop(i)
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421 elif inserts.get(i + 1) == '|':
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422 inserts.pop(i + 1)
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423
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424 # produce all arg strings
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425 elif not action.option_strings:
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426 part = self._format_args(action, action.dest)
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427
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428 # if it's in a group, strip the outer []
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429 if action in group_actions:
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430 if part[0] == '[' and part[-1] == ']':
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431 part = part[1:-1]
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432
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433 # add the action string to the list
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434 parts.append(part)
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435
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436 # produce the first way to invoke the option in brackets
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437 else:
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438 option_string = action.option_strings[0]
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439
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440 # if the Optional doesn't take a value, format is:
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441 # -s or --long
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442 if action.nargs == 0:
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443 part = '%s' % option_string
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444
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445 # if the Optional takes a value, format is:
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446 # -s ARGS or --long ARGS
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447 else:
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448 default = action.dest.upper()
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449 args_string = self._format_args(action, default)
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450 part = '%s %s' % (option_string, args_string)
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451
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452 # make it look optional if it's not required or in a group
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453 if not action.required and action not in group_actions:
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454 part = '[%s]' % part
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455
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456 # add the action string to the list
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457 parts.append(part)
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458
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459 # insert things at the necessary indices
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460 for i in sorted(inserts, reverse=True):
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461 parts[i:i] = [inserts[i]]
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462
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463 # join all the action items with spaces
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464 text = ' '.join([item for item in parts if item is not None])
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465
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466 # clean up separators for mutually exclusive groups
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467 open = r'[\[(]'
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468 close = r'[\])]'
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469 text = _re.sub(r'(%s) ' % open, r'\1', text)
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470 text = _re.sub(r' (%s)' % close, r'\1', text)
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471 text = _re.sub(r'%s *%s' % (open, close), r'', text)
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472 text = _re.sub(r'\(([^|]*)\)', r'\1', text)
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473 text = text.strip()
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474
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475 # return the text
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476 return text
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477
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478 def _format_text(self, text):
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479 if '%(prog)' in text:
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480 text = text % dict(prog=self._prog)
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481 text_width = self._width - self._current_indent
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482 indent = ' ' * self._current_indent
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483 return self._fill_text(text, text_width, indent) + '\n\n'
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484
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485 def _format_action(self, action):
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486 # determine the required width and the entry label
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487 help_position = min(self._action_max_length + 2,
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488 self._max_help_position)
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489 help_width = self._width - help_position
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490 action_width = help_position - self._current_indent - 2
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491 action_header = self._format_action_invocation(action)
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492
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493 # ho nelp; start on same line and add a final newline
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494 if not action.help:
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495 tup = self._current_indent, '', action_header
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496 action_header = '%*s%s\n' % tup
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497
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498 # short action name; start on the same line and pad two spaces
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499 elif len(action_header) <= action_width:
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500 tup = self._current_indent, '', action_width, action_header
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501 action_header = '%*s%-*s ' % tup
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502 indent_first = 0
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503
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504 # long action name; start on the next line
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505 else:
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506 tup = self._current_indent, '', action_header
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507 action_header = '%*s%s\n' % tup
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508 indent_first = help_position
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509
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510 # collect the pieces of the action help
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511 parts = [action_header]
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512
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513 # if there was help for the action, add lines of help text
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514 if action.help:
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515 help_text = self._expand_help(action)
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516 help_lines = self._split_lines(help_text, help_width)
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517 parts.append('%*s%s\n' % (indent_first, '', help_lines[0]))
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518 for line in help_lines[1:]:
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519 parts.append('%*s%s\n' % (help_position, '', line))
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520
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521 # or add a newline if the description doesn't end with one
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522 elif not action_header.endswith('\n'):
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523 parts.append('\n')
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524
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525 # if there are any sub-actions, add their help as well
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526 for subaction in self._iter_indented_subactions(action):
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527 parts.append(self._format_action(subaction))
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528
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529 # return a single string
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530 return self._join_parts(parts)
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531
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532 def _format_action_invocation(self, action):
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533 if not action.option_strings:
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534 metavar, = self._metavar_formatter(action, action.dest)(1)
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535 return metavar
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536
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537 else:
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538 parts = []
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539
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540 # if the Optional doesn't take a value, format is:
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541 # -s, --long
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542 if action.nargs == 0:
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543 parts.extend(action.option_strings)
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544
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545 # if the Optional takes a value, format is:
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546 # -s ARGS, --long ARGS
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547 else:
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548 default = action.dest.upper()
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549 args_string = self._format_args(action, default)
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550 for option_string in action.option_strings:
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551 parts.append('%s %s' % (option_string, args_string))
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552
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553 return ', '.join(parts)
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554
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555 def _metavar_formatter(self, action, default_metavar):
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556 if action.metavar is not None:
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557 result = action.metavar
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558 elif action.choices is not None:
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559 choice_strs = [str(choice) for choice in action.choices]
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560 result = '{%s}' % ','.join(choice_strs)
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561 else:
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562 result = default_metavar
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563
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564 def format(tuple_size):
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565 if isinstance(result, tuple):
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566 return result
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567 else:
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568 return (result, ) * tuple_size
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569 return format
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570
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571 def _format_args(self, action, default_metavar):
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572 get_metavar = self._metavar_formatter(action, default_metavar)
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573 if action.nargs is None:
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574 result = '%s' % get_metavar(1)
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575 elif action.nargs == OPTIONAL:
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576 result = '[%s]' % get_metavar(1)
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577 elif action.nargs == ZERO_OR_MORE:
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578 result = '[%s [%s ...]]' % get_metavar(2)
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579 elif action.nargs == ONE_OR_MORE:
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580 result = '%s [%s ...]' % get_metavar(2)
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581 elif action.nargs == REMAINDER:
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582 result = '...'
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583 elif action.nargs == PARSER:
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584 result = '%s ...' % get_metavar(1)
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585 else:
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586 formats = ['%s' for _ in range(action.nargs)]
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587 result = ' '.join(formats) % get_metavar(action.nargs)
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588 return result
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589
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590 def _expand_help(self, action):
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591 params = dict(vars(action), prog=self._prog)
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592 for name in list(params):
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593 if params[name] is SUPPRESS:
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594 del params[name]
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595 for name in list(params):
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596 if hasattr(params[name], '__name__'):
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597 params[name] = params[name].__name__
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598 if params.get('choices') is not None:
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599 choices_str = ', '.join([str(c) for c in params['choices']])
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600 params['choices'] = choices_str
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601 return self._get_help_string(action) % params
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602
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603 def _iter_indented_subactions(self, action):
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604 try:
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605 get_subactions = action._get_subactions
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606 except AttributeError:
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607 pass
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608 else:
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609 self._indent()
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610 for subaction in get_subactions():
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611 yield subaction
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612 self._dedent()
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613
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614 def _split_lines(self, text, width):
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615 text = self._whitespace_matcher.sub(' ', text).strip()
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616 return _textwrap.wrap(text, width)
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617
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618 def _fill_text(self, text, width, indent):
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619 text = self._whitespace_matcher.sub(' ', text).strip()
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620 return _textwrap.fill(text, width, initial_indent=indent,
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621 subsequent_indent=indent)
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622
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623 def _get_help_string(self, action):
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624 return action.help
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625
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626
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627 class RawDescriptionHelpFormatter(HelpFormatter):
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628 """Help message formatter which retains any formatting in descriptions.
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629
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630 Only the name of this class is considered a public API. All the methods
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631 provided by the class are considered an implementation detail.
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632 """
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633
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634 def _fill_text(self, text, width, indent):
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635 return ''.join([indent + line for line in text.splitlines(True)])
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636
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637
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638 class RawTextHelpFormatter(RawDescriptionHelpFormatter):
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639 """Help message formatter which retains formatting of all help text.
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diff changeset
640
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641 Only the name of this class is considered a public API. All the methods
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642 provided by the class are considered an implementation detail.
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643 """
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644
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645 def _split_lines(self, text, width):
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diff changeset
646 return text.splitlines()
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diff changeset
647
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648
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649 class ArgumentDefaultsHelpFormatter(HelpFormatter):
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650 """Help message formatter which adds default values to argument help.
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651
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652 Only the name of this class is considered a public API. All the methods
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653 provided by the class are considered an implementation detail.
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654 """
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655
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656 def _get_help_string(self, action):
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657 help = action.help
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658 if '%(default)' not in action.help:
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659 if action.default is not SUPPRESS:
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660 defaulting_nargs = [OPTIONAL, ZERO_OR_MORE]
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661 if action.option_strings or action.nargs in defaulting_nargs:
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662 help += ' (default: %(default)s)'
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663 return help
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664
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665
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666 # =====================
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667 # Options and Arguments
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668 # =====================
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669
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diff changeset
670 def _get_action_name(argument):
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671 if argument is None:
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672 return None
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673 elif argument.option_strings:
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674 return '/'.join(argument.option_strings)
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675 elif argument.metavar not in (None, SUPPRESS):
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676 return argument.metavar
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677 elif argument.dest not in (None, SUPPRESS):
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678 return argument.dest
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679 else:
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680 return None
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681
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682
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683 class ArgumentError(Exception):
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684 """An error from creating or using an argument (optional or positional).
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685
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686 The string value of this exception is the message, augmented with
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diff changeset
687 information about the argument that caused it.
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688 """
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689
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690 def __init__(self, argument, message):
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691 self.argument_name = _get_action_name(argument)
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692 self.message = message
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693
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694 def __str__(self):
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695 if self.argument_name is None:
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696 format = '%(message)s'
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697 else:
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698 format = 'argument %(argument_name)s: %(message)s'
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699 return format % dict(message=self.message,
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700 argument_name=self.argument_name)
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701
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702
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703 class ArgumentTypeError(Exception):
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704 """An error from trying to convert a command line string to a type."""
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705 pass
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706
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707
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708 # ==============
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709 # Action classes
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710 # ==============
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711
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712 class Action(_AttributeHolder):
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713 """Information about how to convert command line strings to Python objects.
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714
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715 Action objects are used by an ArgumentParser to represent the information
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716 needed to parse a single argument from one or more strings from the
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717 command line. The keyword arguments to the Action constructor are also
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718 all attributes of Action instances.
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719
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720 Keyword Arguments:
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721
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722 - option_strings -- A list of command-line option strings which
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723 should be associated with this action.
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724
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725 - dest -- The name of the attribute to hold the created object(s)
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726
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727 - nargs -- The number of command-line arguments that should be
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728 consumed. By default, one argument will be consumed and a single
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729 value will be produced. Other values include:
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730 - N (an integer) consumes N arguments (and produces a list)
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731 - '?' consumes zero or one arguments
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732 - '*' consumes zero or more arguments (and produces a list)
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733 - '+' consumes one or more arguments (and produces a list)
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734 Note that the difference between the default and nargs=1 is that
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735 with the default, a single value will be produced, while with
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736 nargs=1, a list containing a single value will be produced.
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737
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738 - const -- The value to be produced if the option is specified and the
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739 option uses an action that takes no values.
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740
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741 - default -- The value to be produced if the option is not specified.
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742
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743 - type -- The type which the command-line arguments should be converted
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744 to, should be one of 'string', 'int', 'float', 'complex' or a
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745 callable object that accepts a single string argument. If None,
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746 'string' is assumed.
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747
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748 - choices -- A container of values that should be allowed. If not None,
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749 after a command-line argument has been converted to the appropriate
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750 type, an exception will be raised if it is not a member of this
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751 collection.
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752
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753 - required -- True if the action must always be specified at the
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754 command line. This is only meaningful for optional command-line
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755 arguments.
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756
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757 - help -- The help string describing the argument.
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758
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759 - metavar -- The name to be used for the option's argument with the
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760 help string. If None, the 'dest' value will be used as the name.
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761 """
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762
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763 def __init__(self,
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764 option_strings,
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765 dest,
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766 nargs=None,
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767 const=None,
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768 default=None,
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769 type=None,
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770 choices=None,
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771 required=False,
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772 help=None,
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773 metavar=None):
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774 self.option_strings = option_strings
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775 self.dest = dest
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776 self.nargs = nargs
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777 self.const = const
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778 self.default = default
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779 self.type = type
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780 self.choices = choices
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781 self.required = required
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782 self.help = help
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783 self.metavar = metavar
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784
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785 def _get_kwargs(self):
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786 names = [
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787 'option_strings',
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788 'dest',
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789 'nargs',
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790 'const',
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791 'default',
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792 'type',
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793 'choices',
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794 'help',
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795 'metavar',
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796 ]
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797 return [(name, getattr(self, name)) for name in names]
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798
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799 def __call__(self, parser, namespace, values, option_string=None):
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800 raise NotImplementedError(_('.__call__() not defined'))
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801
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802
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803 class _StoreAction(Action):
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804
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805 def __init__(self,
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806 option_strings,
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807 dest,
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808 nargs=None,
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809 const=None,
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810 default=None,
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811 type=None,
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812 choices=None,
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813 required=False,
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814 help=None,
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815 metavar=None):
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816 if nargs == 0:
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817 raise ValueError('nargs for store actions must be > 0; if you '
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818 'have nothing to store, actions such as store '
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819 'true or store const may be more appropriate')
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820 if const is not None and nargs != OPTIONAL:
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821 raise ValueError('nargs must be %r to supply const' % OPTIONAL)
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822 super(_StoreAction, self).__init__(
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823 option_strings=option_strings,
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824 dest=dest,
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825 nargs=nargs,
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826 const=const,
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827 default=default,
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828 type=type,
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829 choices=choices,
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830 required=required,
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831 help=help,
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832 metavar=metavar)
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diff changeset
833
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834 def __call__(self, parser, namespace, values, option_string=None):
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835 setattr(namespace, self.dest, values)
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diff changeset
836
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diff changeset
837
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838 class _StoreConstAction(Action):
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diff changeset
839
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840 def __init__(self,
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841 option_strings,
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842 dest,
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843 const,
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844 default=None,
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845 required=False,
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846 help=None,
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847 metavar=None):
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848 super(_StoreConstAction, self).__init__(
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849 option_strings=option_strings,
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850 dest=dest,
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851 nargs=0,
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852 const=const,
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853 default=default,
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854 required=required,
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855 help=help)
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856
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857 def __call__(self, parser, namespace, values, option_string=None):
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858 setattr(namespace, self.dest, self.const)
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diff changeset
859
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diff changeset
860
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861 class _StoreTrueAction(_StoreConstAction):
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862
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diff changeset
863 def __init__(self,
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864 option_strings,
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865 dest,
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866 default=False,
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867 required=False,
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868 help=None):
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869 super(_StoreTrueAction, self).__init__(
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870 option_strings=option_strings,
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871 dest=dest,
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872 const=True,
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873 default=default,
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874 required=required,
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diff changeset
875 help=help)
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diff changeset
876
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diff changeset
877
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diff changeset
878 class _StoreFalseAction(_StoreConstAction):
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diff changeset
879
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diff changeset
880 def __init__(self,
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881 option_strings,
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diff changeset
882 dest,
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diff changeset
883 default=True,
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diff changeset
884 required=False,
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diff changeset
885 help=None):
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diff changeset
886 super(_StoreFalseAction, self).__init__(
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diff changeset
887 option_strings=option_strings,
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diff changeset
888 dest=dest,
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889 const=False,
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890 default=default,
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891 required=required,
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diff changeset
892 help=help)
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diff changeset
893
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diff changeset
894
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diff changeset
895 class _AppendAction(Action):
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Benjamin Peterson <benjamin@python.org>
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diff changeset
896
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diff changeset
897 def __init__(self,
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diff changeset
898 option_strings,
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diff changeset
899 dest,
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diff changeset
900 nargs=None,
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diff changeset
901 const=None,
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diff changeset
902 default=None,
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diff changeset
903 type=None,
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diff changeset
904 choices=None,
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diff changeset
905 required=False,
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906 help=None,
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907 metavar=None):
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908 if nargs == 0:
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diff changeset
909 raise ValueError('nargs for append actions must be > 0; if arg '
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910 'strings are not supplying the value to append, '
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diff changeset
911 'the append const action may be more appropriate')
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diff changeset
912 if const is not None and nargs != OPTIONAL:
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diff changeset
913 raise ValueError('nargs must be %r to supply const' % OPTIONAL)
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diff changeset
914 super(_AppendAction, self).__init__(
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915 option_strings=option_strings,
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diff changeset
916 dest=dest,
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diff changeset
917 nargs=nargs,
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diff changeset
918 const=const,
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diff changeset
919 default=default,
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diff changeset
920 type=type,
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diff changeset
921 choices=choices,
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diff changeset
922 required=required,
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diff changeset
923 help=help,
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diff changeset
924 metavar=metavar)
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diff changeset
925
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diff changeset
926 def __call__(self, parser, namespace, values, option_string=None):
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diff changeset
927 items = _copy.copy(_ensure_value(namespace, self.dest, []))
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diff changeset
928 items.append(values)
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diff changeset
929 setattr(namespace, self.dest, items)
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diff changeset
930
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diff changeset
931
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diff changeset
932 class _AppendConstAction(Action):
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diff changeset
933
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934 def __init__(self,
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935 option_strings,
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diff changeset
936 dest,
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937 const,
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938 default=None,
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939 required=False,
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940 help=None,
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941 metavar=None):
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diff changeset
942 super(_AppendConstAction, self).__init__(
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diff changeset
943 option_strings=option_strings,
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diff changeset
944 dest=dest,
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945 nargs=0,
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946 const=const,
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947 default=default,
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948 required=required,
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949 help=help,
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950 metavar=metavar)
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diff changeset
951
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diff changeset
952 def __call__(self, parser, namespace, values, option_string=None):
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953 items = _copy.copy(_ensure_value(namespace, self.dest, []))
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diff changeset
954 items.append(self.const)
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955 setattr(namespace, self.dest, items)
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diff changeset
956
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diff changeset
957
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958 class _CountAction(Action):
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959
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diff changeset
960 def __init__(self,
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961 option_strings,
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962 dest,
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963 default=None,
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964 required=False,
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965 help=None):
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966 super(_CountAction, self).__init__(
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967 option_strings=option_strings,
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968 dest=dest,
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969 nargs=0,
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diff changeset
970 default=default,
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971 required=required,
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972 help=help)
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diff changeset
973
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974 def __call__(self, parser, namespace, values, option_string=None):
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975 new_count = _ensure_value(namespace, self.dest, 0) + 1
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976 setattr(namespace, self.dest, new_count)
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977
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978
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979 class _HelpAction(Action):
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980
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981 def __init__(self,
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982 option_strings,
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983 dest=SUPPRESS,
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984 default=SUPPRESS,
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985 help=None):
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986 super(_HelpAction, self).__init__(
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987 option_strings=option_strings,
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988 dest=dest,
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989 default=default,
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990 nargs=0,
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991 help=help)
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992
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993 def __call__(self, parser, namespace, values, option_string=None):
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994 parser.print_help()
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995 parser.exit()
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996
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997
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998 class _VersionAction(Action):
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999
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1000 def __init__(self,
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1001 option_strings,
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1002 version=None,
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1003 dest=SUPPRESS,
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1004 default=SUPPRESS,
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1005 help="show program's version number and exit"):
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1006 super(_VersionAction, self).__init__(
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1007 option_strings=option_strings,
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1008 dest=dest,
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1009 default=default,
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1010 nargs=0,
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1011 help=help)
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1012 self.version = version
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1013
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1014 def __call__(self, parser, namespace, values, option_string=None):
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1015 version = self.version
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1016 if version is None:
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1017 version = parser.version
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1018 formatter = parser._get_formatter()
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1019 formatter.add_text(version)
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1020 parser.exit(message=formatter.format_help())
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1021
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1022
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1023 class _SubParsersAction(Action):
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1024
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1025 class _ChoicesPseudoAction(Action):
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1026
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1027 def __init__(self, name, aliases, help):
4c0426261148 Add subparser aliases for argparse. Resolves issue 9324. Approved by Georg for beta2 on the tracker.
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1028 metavar = dest = name
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diff changeset
1029 if aliases:
4c0426261148 Add subparser aliases for argparse. Resolves issue 9324. Approved by Georg for beta2 on the tracker.
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1030 metavar += ' (%s)' % ', '.join(aliases)
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1031 sup = super(_SubParsersAction._ChoicesPseudoAction, self)
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diff changeset
1032 sup.__init__(option_strings=[], dest=dest, help=help,
4c0426261148 Add subparser aliases for argparse. Resolves issue 9324. Approved by Georg for beta2 on the tracker.
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1033 metavar=metavar)
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1034
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1035 def __init__(self,
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1036 option_strings,
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1037 prog,
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1038 parser_class,
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1039 dest=SUPPRESS,
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1040 help=None,
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1041 metavar=None):
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1042
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1043 self._prog_prefix = prog
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1044 self._parser_class = parser_class
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Steven Bethard <steven.bethard@gmail.com>
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1045 self._name_parser_map = _collections.OrderedDict()
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1046 self._choices_actions = []
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1047
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1048 super(_SubParsersAction, self).__init__(
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1049 option_strings=option_strings,
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1050 dest=dest,
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1051 nargs=PARSER,
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1052 choices=self._name_parser_map,
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1053 help=help,
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1054 metavar=metavar)
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1055
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1056 def add_parser(self, name, **kwargs):
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1057 # set prog from the existing prefix
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1058 if kwargs.get('prog') is None:
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1059 kwargs['prog'] = '%s %s' % (self._prog_prefix, name)
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1060
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1061 aliases = kwargs.pop('aliases', ())
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1062
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1063 # create a pseudo-action to hold the choice help
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1064 if 'help' in kwargs:
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1065 help = kwargs.pop('help')
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1066 choice_action = self._ChoicesPseudoAction(name, aliases, help)
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1067 self._choices_actions.append(choice_action)
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1068
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1069 # create the parser and add it to the map
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1070 parser = self._parser_class(**kwargs)
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1071 self._name_parser_map[name] = parser
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1072
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1073 # make parser available under aliases also
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1074 for alias in aliases:
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1075 self._name_parser_map[alias] = parser
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1076
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1077 return parser
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1078
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1079 def _get_subactions(self):
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1080 return self._choices_actions
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1081
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1082 def __call__(self, parser, namespace, values, option_string=None):
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1083 parser_name = values[0]
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1084 arg_strings = values[1:]
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1085
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1086 # set the parser name if requested
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1087 if self.dest is not SUPPRESS:
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1088 setattr(namespace, self.dest, parser_name)
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1089
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1090 # select the parser
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1091 try:
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1092 parser = self._name_parser_map[parser_name]
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1093 except KeyError:
66661
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diff changeset
1094 args = {'parser_name': parser_name,
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diff changeset
1095 'choices': ', '.join(self._name_parser_map)}
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1096 msg = _('unknown parser %(parser_name)r (choices: %(choices)s)') % args
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1097 raise ArgumentError(self, msg)
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diff changeset
1098
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1099 # parse all the remaining options into the namespace
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1100 # store any unrecognized options on the object, so that the top
ff6f39b3c38e Fix bug 9340 - argparse parse_known_args didn't work with subparsers
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1101 # level parser can decide what to do with them
ff6f39b3c38e Fix bug 9340 - argparse parse_known_args didn't work with subparsers
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diff changeset
1102 namespace, arg_strings = parser.parse_known_args(arg_strings, namespace)
ff6f39b3c38e Fix bug 9340 - argparse parse_known_args didn't work with subparsers
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diff changeset
1103 if arg_strings:
ff6f39b3c38e Fix bug 9340 - argparse parse_known_args didn't work with subparsers
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diff changeset
1104 vars(namespace).setdefault(_UNRECOGNIZED_ARGS_ATTR, [])
ff6f39b3c38e Fix bug 9340 - argparse parse_known_args didn't work with subparsers
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diff changeset
1105 getattr(namespace, _UNRECOGNIZED_ARGS_ATTR).extend(arg_strings)
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1106
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1107
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1108 # ==============
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1109 # Type classes
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1110 # ==============
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1111
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1112 class FileType(object):
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1113 """Factory for creating file object types
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1114
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1115 Instances of FileType are typically passed as type= arguments to the
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1116 ArgumentParser add_argument() method.
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1117
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1118 Keyword Arguments:
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1119 - mode -- A string indicating how the file is to be opened. Accepts the
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1120 same values as the builtin open() function.
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1121 - bufsize -- The file's desired buffer size. Accepts the same values as
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1122 the builtin open() function.
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1123 """
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1124
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1125 def __init__(self, mode='r', bufsize=-1):
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1126 self._mode = mode
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1127 self._bufsize = bufsize
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1128
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1129 def __call__(self, string):
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1130 # the special argument "-" means sys.std{in,out}
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1131 if string == '-':
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1132 if 'r' in self._mode:
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1133 return _sys.stdin
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1134 elif 'w' in self._mode:
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1135 return _sys.stdout
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1136 else:
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1137 msg = _('argument "-" with mode %r') % self._mode
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1138 raise ValueError(msg)
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1139
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1140 # all other arguments are used as file names
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1141 try:
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1142 return open(string, self._mode, self._bufsize)
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1143 except IOError as e:
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1144 message = _("can't open '%s': %s")
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1145 raise ArgumentTypeError(message % (string, e))
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1146
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1147 def __repr__(self):
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1148 args = self._mode, self._bufsize
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1149 args_str = ', '.join(repr(arg) for arg in args if arg != -1)
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1150 return '%s(%s)' % (type(self).__name__, args_str)
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1151
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1152 # ===========================
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1153 # Optional and Positional Parsing
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1154 # ===========================
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1155
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1156 class Namespace(_AttributeHolder):
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1157 """Simple object for storing attributes.
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1158
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1159 Implements equality by attribute names and values, and provides a simple
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1160 string representation.
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1161 """
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1162
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1163 def __init__(self, **kwargs):
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1164 for name in kwargs:
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1165 setattr(self, name, kwargs[name])
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1166
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1167 def __eq__(self, other):
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1168 return vars(self) == vars(other)
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1169
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1170 def __ne__(self, other):
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1171 return not (self == other)
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1172
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1173 def __contains__(self, key):
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1174 return key in self.__dict__
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1175
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1176
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1177 class _ActionsContainer(object):
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1178
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1179 def __init__(self,
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1180 description,
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1181 prefix_chars,
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1182 argument_default,
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1183 conflict_handler):
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1184 super(_ActionsContainer, self).__init__()
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1185
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1186 self.description = description
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1187 self.argument_default = argument_default
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1188 self.prefix_chars = prefix_chars
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1189 self.conflict_handler = conflict_handler
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1190
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1191 # set up registries
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1192 self._registries = {}
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1193
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1194 # register actions
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1195 self.register('action', None, _StoreAction)
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1196 self.register('action', 'store', _StoreAction)
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1197 self.register('action', 'store_const', _StoreConstAction)
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1198 self.register('action', 'store_true', _StoreTrueAction)
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1199 self.register('action', 'store_false', _StoreFalseAction)
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1200 self.register('action', 'append', _AppendAction)
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1201 self.register('action', 'append_const', _AppendConstAction)
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1202 self.register('action', 'count', _CountAction)
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1203 self.register('action', 'help', _HelpAction)
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1204 self.register('action', 'version', _VersionAction)
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1205 self.register('action', 'parsers', _SubParsersAction)
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1206
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1207 # raise an exception if the conflict handler is invalid
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1208 self._get_handler()
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1209
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1210 # action storage
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1211 self._actions = []
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1212 self._option_string_actions = {}
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1213
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1214 # groups
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1215 self._action_groups = []
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1216 self._mutually_exclusive_groups = []
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diff changeset
1217
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diff changeset
1218 # defaults storage
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1219 self._defaults = {}
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diff changeset
1220
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1221 # determines whether an "option" looks like a negative number
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1222 self._negative_number_matcher = _re.compile(r'^-\d+$|^-\d*\.\d+$')
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1223
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1224 # whether or not there are any optionals that look like negative
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1225 # numbers -- uses a list so it can be shared and edited
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1226 self._has_negative_number_optionals = []
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1227
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1228 # ====================
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1229 # Registration methods
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1230 # ====================
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1231 def register(self, registry_name, value, object):
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1232 registry = self._registries.setdefault(registry_name, {})
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1233 registry[value] = object
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1234
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1235 def _registry_get(self, registry_name, value, default=None):
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1236 return self._registries[registry_name].get(value, default)
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1237
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1238 # ==================================
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1239 # Namespace default accessor methods
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1240 # ==================================
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diff changeset
1241 def set_defaults(self, **kwargs):
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diff changeset
1242 self._defaults.update(kwargs)
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diff changeset
1243
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diff changeset
1244 # if these defaults match any existing arguments, replace
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diff changeset
1245 # the previous default on the object with the new one
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diff changeset
1246 for action in self._actions:
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parents: 59258
diff changeset
1247 if action.dest in kwargs:
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parents: 59258
diff changeset
1248 action.default = kwargs[action.dest]
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diff changeset
1249
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diff changeset
1250 def get_default(self, dest):
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diff changeset
1251 for action in self._actions:
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diff changeset
1252 if action.dest == dest and action.default is not None:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1253 return action.default
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1254 return self._defaults.get(dest, None)
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Benjamin Peterson <benjamin@python.org>
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diff changeset
1255
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diff changeset
1256
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diff changeset
1257 # =======================
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diff changeset
1258 # Adding argument actions
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parents: 59258
diff changeset
1259 # =======================
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parents: 59258
diff changeset
1260 def add_argument(self, *args, **kwargs):
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parents: 59258
diff changeset
1261 """
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diff changeset
1262 add_argument(dest, ..., name=value, ...)
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parents: 59258
diff changeset
1263 add_argument(option_string, option_string, ..., name=value, ...)
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diff changeset
1264 """
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diff changeset
1265
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diff changeset
1266 # if no positional args are supplied or only one is supplied and
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diff changeset
1267 # it doesn't look like an option string, parse a positional
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parents: 59258
diff changeset
1268 # argument
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diff changeset
1269 chars = self.prefix_chars
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diff changeset
1270 if not args or len(args) == 1 and args[0][0] not in chars:
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diff changeset
1271 if args and 'dest' in kwargs:
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diff changeset
1272 raise ValueError('dest supplied twice for positional argument')
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diff changeset
1273 kwargs = self._get_positional_kwargs(*args, **kwargs)
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diff changeset
1274
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diff changeset
1275 # otherwise, we're adding an optional argument
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diff changeset
1276 else:
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diff changeset
1277 kwargs = self._get_optional_kwargs(*args, **kwargs)
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diff changeset
1278
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diff changeset
1279 # if no default was supplied, use the parser-level default
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diff changeset
1280 if 'default' not in kwargs:
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diff changeset
1281 dest = kwargs['dest']
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parents: 59258
diff changeset
1282 if dest in self._defaults:
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diff changeset
1283 kwargs['default'] = self._defaults[dest]
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parents: 59258
diff changeset
1284 elif self.argument_default is not None:
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Benjamin Peterson <benjamin@python.org>
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diff changeset
1285 kwargs['default'] = self.argument_default
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diff changeset
1286
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diff changeset
1287 # create the action object, and add it to the parser
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diff changeset
1288 action_class = self._pop_action_class(kwargs)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1289 if not _callable(action_class):
69126
69ab5251f3f0 Issue #9347: Fix formatting for tuples in argparse type= error messages.
Steven Bethard <steven.bethard@gmail.com>
parents: 69003
diff changeset
1290 raise ValueError('unknown action "%s"' % (action_class,))
59275
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diff changeset
1291 action = action_class(**kwargs)
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diff changeset
1292
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diff changeset
1293 # raise an error if the action type is not callable
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diff changeset
1294 type_func = self._registry_get('type', action.type, action.type)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1295 if not _callable(type_func):
69126
69ab5251f3f0 Issue #9347: Fix formatting for tuples in argparse type= error messages.
Steven Bethard <steven.bethard@gmail.com>
parents: 69003
diff changeset
1296 raise ValueError('%r is not callable' % (type_func,))
59275
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Benjamin Peterson <benjamin@python.org>
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diff changeset
1297
68967
c89db9b36ea6 Issue #9348: Raise an early error if argparse nargs and metavar don't match.
Steven Bethard <steven.bethard@gmail.com>
parents: 67819
diff changeset
1298 # raise an error if the metavar does not match the type
c89db9b36ea6 Issue #9348: Raise an early error if argparse nargs and metavar don't match.
Steven Bethard <steven.bethard@gmail.com>
parents: 67819
diff changeset
1299 if hasattr(self, "_get_formatter"):
c89db9b36ea6 Issue #9348: Raise an early error if argparse nargs and metavar don't match.
Steven Bethard <steven.bethard@gmail.com>
parents: 67819
diff changeset
1300 try:
c89db9b36ea6 Issue #9348: Raise an early error if argparse nargs and metavar don't match.
Steven Bethard <steven.bethard@gmail.com>
parents: 67819
diff changeset
1301 self._get_formatter()._format_args(action, None)
c89db9b36ea6 Issue #9348: Raise an early error if argparse nargs and metavar don't match.
Steven Bethard <steven.bethard@gmail.com>
parents: 67819
diff changeset
1302 except TypeError:
c89db9b36ea6 Issue #9348: Raise an early error if argparse nargs and metavar don't match.
Steven Bethard <steven.bethard@gmail.com>
parents: 67819
diff changeset
1303 raise ValueError("length of metavar tuple does not match nargs")
c89db9b36ea6 Issue #9348: Raise an early error if argparse nargs and metavar don't match.
Steven Bethard <steven.bethard@gmail.com>
parents: 67819
diff changeset
1304
59275
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diff changeset
1305 return self._add_action(action)
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diff changeset
1306
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diff changeset
1307 def add_argument_group(self, *args, **kwargs):
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diff changeset
1308 group = _ArgumentGroup(self, *args, **kwargs)
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diff changeset
1309 self._action_groups.append(group)
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diff changeset
1310 return group
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diff changeset
1311
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diff changeset
1312 def add_mutually_exclusive_group(self, **kwargs):
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parents: 59258
diff changeset
1313 group = _MutuallyExclusiveGroup(self, **kwargs)
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diff changeset
1314 self._mutually_exclusive_groups.append(group)
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diff changeset
1315 return group
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diff changeset
1316
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diff changeset
1317 def _add_action(self, action):
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diff changeset
1318 # resolve any conflicts
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diff changeset
1319 self._check_conflict(action)
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diff changeset
1320
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diff changeset
1321 # add to actions list
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diff changeset
1322 self._actions.append(action)
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diff changeset
1323 action.container = self
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diff changeset
1324
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diff changeset
1325 # index the action by any option strings it has
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diff changeset
1326 for option_string in action.option_strings:
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diff changeset
1327 self._option_string_actions[option_string] = action
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diff changeset
1328
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diff changeset
1329 # set the flag if any option strings look like negative numbers
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diff changeset
1330 for option_string in action.option_strings:
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diff changeset
1331 if self._negative_number_matcher.match(option_string):
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diff changeset
1332 if not self._has_negative_number_optionals:
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diff changeset
1333 self._has_negative_number_optionals.append(True)
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diff changeset
1334
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diff changeset
1335 # return the created action
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diff changeset
1336 return action
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diff changeset
1337
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diff changeset
1338 def _remove_action(self, action):
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diff changeset
1339 self._actions.remove(action)
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diff changeset
1340
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diff changeset
1341 def _add_container_actions(self, container):
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diff changeset
1342 # collect groups by titles
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diff changeset
1343 title_group_map = {}
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diff changeset
1344 for group in self._action_groups:
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diff changeset
1345 if group.title in title_group_map:
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diff changeset
1346 msg = _('cannot merge actions - two groups are named %r')
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diff changeset
1347 raise ValueError(msg % (group.title))
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diff changeset
1348 title_group_map[group.title] = group
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diff changeset
1349
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diff changeset
1350 # map each action to its group
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diff changeset
1351 group_map = {}
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diff changeset
1352 for group in container._action_groups:
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diff changeset
1353
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diff changeset
1354 # if a group with the title exists, use that, otherwise
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diff changeset
1355 # create a new group matching the container's group
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diff changeset
1356 if group.title not in title_group_map:
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diff changeset
1357 title_group_map[group.title] = self.add_argument_group(
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diff changeset
1358 title=group.title,
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parents: 59258
diff changeset
1359 description=group.description,
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diff changeset
1360 conflict_handler=group.conflict_handler)
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diff changeset
1361
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diff changeset
1362 # map the actions to their new group
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Benjamin Peterson <benjamin@python.org>
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diff changeset
1363 for action in group._group_actions:
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diff changeset
1364 group_map[action] = title_group_map[group.title]
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diff changeset
1365
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diff changeset
1366 # add container's mutually exclusive groups
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diff changeset
1367 # NOTE: if add_mutually_exclusive_group ever gains title= and
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parents: 59258
diff changeset
1368 # description= then this code will need to be expanded as above
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diff changeset
1369 for group in container._mutually_exclusive_groups:
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parents: 59258
diff changeset
1370 mutex_group = self.add_mutually_exclusive_group(
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parents: 59258
diff changeset
1371 required=group.required)
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diff changeset
1372
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diff changeset
1373 # map the actions to their new mutex group
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1374 for action in group._group_actions:
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parents: 59258
diff changeset
1375 group_map[action] = mutex_group
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parents: 59258
diff changeset
1376
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diff changeset
1377 # add all actions to this container or their group
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parents: 59258
diff changeset
1378 for action in container._actions:
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parents: 59258
diff changeset
1379 group_map.get(action, self)._add_action(action)
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parents: 59258
diff changeset
1380
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diff changeset
1381 def _get_positional_kwargs(self, dest, **kwargs):
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parents: 59258
diff changeset
1382 # make sure required is not specified
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diff changeset
1383 if 'required' in kwargs:
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diff changeset
1384 msg = _("'required' is an invalid argument for positionals")
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diff changeset
1385 raise TypeError(msg)
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diff changeset
1386
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diff changeset
1387 # mark positional arguments as required if at least one is
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diff changeset
1388 # always required
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parents: 59258
diff changeset
1389 if kwargs.get('nargs') not in [OPTIONAL, ZERO_OR_MORE]:
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parents: 59258
diff changeset
1390 kwargs['required'] = True
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diff changeset
1391 if kwargs.get('nargs') == ZERO_OR_MORE and 'default' not in kwargs:
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diff changeset
1392 kwargs['required'] = True
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diff changeset
1393
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diff changeset
1394 # return the keyword arguments with no option strings
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diff changeset
1395 return dict(kwargs, dest=dest, option_strings=[])
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diff changeset
1396
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diff changeset
1397 def _get_optional_kwargs(self, *args, **kwargs):
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diff changeset
1398 # determine short and long option strings
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diff changeset
1399 option_strings = []
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diff changeset
1400 long_option_strings = []
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diff changeset
1401 for option_string in args:
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parents: 59258
diff changeset
1402 # error on strings that don't start with an appropriate prefix
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diff changeset
1403 if not option_string[0] in self.prefix_chars:
66661
4c9844732925 Allow translators to reorder placeholders in localizable messages from
Éric Araujo <merwok@netwok.org>
parents: 66655
diff changeset
1404 args = {'option': option_string,
4c9844732925 Allow translators to reorder placeholders in localizable messages from
Éric Araujo <merwok@netwok.org>
parents: 66655
diff changeset
1405 'prefix_chars': self.prefix_chars}
4c9844732925 Allow translators to reorder placeholders in localizable messages from
Éric Araujo <merwok@netwok.org>
parents: 66655
diff changeset
1406 msg = _('invalid option string %(option)r: '
4c9844732925 Allow translators to reorder placeholders in localizable messages from
Éric Araujo <merwok@netwok.org>
parents: 66655
diff changeset
1407 'must start with a character %(prefix_chars)r')
4c9844732925 Allow translators to reorder placeholders in localizable messages from
Éric Araujo <merwok@netwok.org>
parents: 66655
diff changeset
1408 raise ValueError(msg % args)
59275
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diff changeset
1409
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diff changeset
1410 # strings starting with two prefix characters are long options
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diff changeset
1411 option_strings.append(option_string)
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diff changeset
1412 if option_string[0] in self.prefix_chars:
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diff changeset
1413 if len(option_string) > 1:
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diff changeset
1414 if option_string[1] in self.prefix_chars:
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diff changeset
1415 long_option_strings.append(option_string)
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diff changeset
1416
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diff changeset
1417 # infer destination, '--foo-bar' -> 'foo_bar' and '-x' -> 'x'
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diff changeset
1418 dest = kwargs.pop('dest', None)
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diff changeset
1419 if dest is None:
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diff changeset
1420 if long_option_strings:
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diff changeset
1421 dest_option_string = long_option_strings[0]
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diff changeset
1422 else:
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diff changeset
1423 dest_option_string = option_strings[0]
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diff changeset
1424 dest = dest_option_string.lstrip(self.prefix_chars)
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diff changeset
1425 if not dest:
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diff changeset
1426 msg = _('dest= is required for options like %r')
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diff changeset
1427 raise ValueError(msg % option_string)
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parents: 59258
diff changeset
1428 dest = dest.replace('-', '_')
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diff changeset
1429
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diff changeset
1430 # return the updated keyword arguments
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diff changeset
1431 return dict(kwargs, dest=dest, option_strings=option_strings)
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diff changeset
1432
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diff changeset
1433 def _pop_action_class(self, kwargs, default=None):
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diff changeset
1434 action = kwargs.pop('action', default)
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parents: 59258
diff changeset
1435 return self._registry_get('action', action, action)
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diff changeset
1436
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diff changeset
1437 def _get_handler(self):
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parents: 59258
diff changeset
1438 # determine function from conflict handler string
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diff changeset
1439 handler_func_name = '_handle_conflict_%s' % self.conflict_handler
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parents: 59258
diff changeset
1440 try:
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diff changeset
1441 return getattr(self, handler_func_name)
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parents: 59258
diff changeset
1442 except AttributeError:
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diff changeset
1443 msg = _('invalid conflict_resolution value: %r')
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parents: 59258
diff changeset
1444 raise ValueError(msg % self.conflict_handler)
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diff changeset
1445
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diff changeset
1446 def _check_conflict(self, action):
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diff changeset
1447
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diff changeset
1448 # find all options that conflict with this option
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Benjamin Peterson <benjamin@python.org>
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diff changeset
1449 confl_optionals = []
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parents: 59258
diff changeset
1450 for option_string in action.option_strings:
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diff changeset
1451 if option_string in self._option_string_actions:
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diff changeset
1452 confl_optional = self._option_string_actions[option_string]
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parents: 59258
diff changeset
1453 confl_optionals.append((option_string, confl_optional))
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parents: 59258
diff changeset
1454
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diff changeset
1455 # resolve any conflicts
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diff changeset
1456 if confl_optionals:
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diff changeset
1457 conflict_handler = self._get_handler()
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parents: 59258
diff changeset
1458 conflict_handler(action, confl_optionals)
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diff changeset
1459
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diff changeset
1460 def _handle_conflict_error(self, action, conflicting_actions):
66721
1827a8ac9b18 Use proper plural forms in argparse (#4391)
Éric Araujo <merwok@netwok.org>
parents: 66661
diff changeset
1461 message = ngettext('conflicting option string: %s',
1827a8ac9b18 Use proper plural forms in argparse (#4391)
Éric Araujo <merwok@netwok.org>
parents: 66661
diff changeset
1462 'conflicting option strings: %s',
1827a8ac9b18 Use proper plural forms in argparse (#4391)
Éric Araujo <merwok@netwok.org>
parents: 66661
diff changeset
1463 len(conflicting_actions))
59275
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diff changeset
1464 conflict_string = ', '.join([option_string
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diff changeset
1465 for option_string, action
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diff changeset
1466 in conflicting_actions])
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diff changeset
1467 raise ArgumentError(action, message % conflict_string)
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diff changeset
1468
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diff changeset
1469 def _handle_conflict_resolve(self, action, conflicting_actions):
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parents: 59258
diff changeset
1470
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diff changeset
1471 # remove all conflicting options
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diff changeset
1472 for option_string, action in conflicting_actions:
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diff changeset
1473
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diff changeset
1474 # remove the conflicting option
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diff changeset
1475 action.option_strings.remove(option_string)
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parents: 59258
diff changeset
1476 self._option_string_actions.pop(option_string, None)
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diff changeset
1477
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parents: 59258
diff changeset
1478 # if the option now has no option string, remove it from the
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diff changeset
1479 # container holding it
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diff changeset
1480 if not action.option_strings:
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diff changeset
1481 action.container._remove_action(action)
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diff changeset
1482
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diff changeset
1483
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diff changeset
1484 class _ArgumentGroup(_ActionsContainer):
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diff changeset
1485
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diff changeset
1486 def __init__(self, container, title=None, description=None, **kwargs):
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diff changeset
1487 # add any missing keyword arguments by checking the container
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diff changeset
1488 update = kwargs.setdefault
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diff changeset
1489 update('conflict_handler', container.conflict_handler)
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diff changeset
1490 update('prefix_chars', container.prefix_chars)
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diff changeset
1491 update('argument_default', container.argument_default)
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diff changeset
1492 super_init = super(_ArgumentGroup, self).__init__
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diff changeset
1493 super_init(description=description, **kwargs)
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diff changeset
1494
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diff changeset
1495 # group attributes
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diff changeset
1496 self.title = title
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diff changeset
1497 self._group_actions = []
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diff changeset
1498
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diff changeset
1499 # share most attributes with the container
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diff changeset
1500 self._registries = container._registries
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diff changeset
1501 self._actions = container._actions
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diff changeset
1502 self._option_string_actions = container._option_string_actions
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diff changeset
1503 self._defaults = container._defaults
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diff changeset
1504 self._has_negative_number_optionals = \
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diff changeset
1505 container._has_negative_number_optionals
67819
2bef7ab6256b #10680: fix mutually exclusive arguments in argument groups.
Georg Brandl <georg@python.org>
parents: 67746
diff changeset
1506 self._mutually_exclusive_groups = container._mutually_exclusive_groups
59275
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diff changeset
1507
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1508 def _add_action(self, action):
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diff changeset
1509 action = super(_ArgumentGroup, self)._add_action(action)
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1510 self._group_actions.append(action)
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1511 return action
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1512
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1513 def _remove_action(self, action):
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diff changeset
1514 super(_ArgumentGroup, self)._remove_action(action)
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diff changeset
1515 self._group_actions.remove(action)
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1516
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1517
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diff changeset
1518 class _MutuallyExclusiveGroup(_ArgumentGroup):
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1519
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1520 def __init__(self, container, required=False):
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1521 super(_MutuallyExclusiveGroup, self).__init__(container)
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diff changeset
1522 self.required = required
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diff changeset
1523 self._container = container
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1524
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1525 def _add_action(self, action):
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diff changeset
1526 if action.required:
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diff changeset
1527 msg = _('mutually exclusive arguments must be optional')
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diff changeset
1528 raise ValueError(msg)
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diff changeset
1529 action = self._container._add_action(action)
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diff changeset
1530 self._group_actions.append(action)
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1531 return action
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1532
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1533 def _remove_action(self, action):
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diff changeset
1534 self._container._remove_action(action)
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diff changeset
1535 self._group_actions.remove(action)
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1536
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1537
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1538 class ArgumentParser(_AttributeHolder, _ActionsContainer):
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1539 """Object for parsing command line strings into Python objects.
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1540
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1541 Keyword Arguments:
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1542 - prog -- The name of the program (default: sys.argv[0])
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1543 - usage -- A usage message (default: auto-generated from arguments)
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1544 - description -- A description of what the program does
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1545 - epilog -- Text following the argument descriptions
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1546 - parents -- Parsers whose arguments should be copied into this one
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diff changeset
1547 - formatter_class -- HelpFormatter class for printing help messages
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diff changeset
1548 - prefix_chars -- Characters that prefix optional arguments
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1549 - fromfile_prefix_chars -- Characters that prefix files containing
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diff changeset
1550 additional arguments
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diff changeset
1551 - argument_default -- The default value for all arguments
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diff changeset
1552 - conflict_handler -- String indicating how to handle conflicts
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diff changeset
1553 - add_help -- Add a -h/-help option
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diff changeset
1554 """
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diff changeset
1555
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diff changeset
1556 def __init__(self,
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diff changeset
1557 prog=None,
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diff changeset
1558 usage=None,
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diff changeset
1559 description=None,
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diff changeset
1560 epilog=None,
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diff changeset
1561 version=None,
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diff changeset
1562 parents=[],
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diff changeset
1563 formatter_class=HelpFormatter,
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diff changeset
1564 prefix_chars='-',
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1565 fromfile_prefix_chars=None,
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1566 argument_default=None,
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1567 conflict_handler='error',
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diff changeset
1568 add_help=True):
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diff changeset
1569
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1570 if version is not None:
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1571 import warnings
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1572 warnings.warn(
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diff changeset
1573 """The "version" argument to ArgumentParser is deprecated. """
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diff changeset
1574 """Please use """
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diff changeset
1575 """"add_argument(..., action='version', version="N", ...)" """
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diff changeset
1576 """instead""", DeprecationWarning)
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diff changeset
1577
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diff changeset
1578 superinit = super(ArgumentParser, self).__init__
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diff changeset
1579 superinit(description=description,
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diff changeset
1580 prefix_chars=prefix_chars,
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diff changeset
1581 argument_default=argument_default,
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diff changeset
1582 conflict_handler=conflict_handler)
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diff changeset
1583
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1584 # default setting for prog
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1585 if prog is None:
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diff changeset
1586 prog = _os.path.basename(_sys.argv[0])
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1587
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1588 self.prog = prog
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diff changeset
1589 self.usage = usage
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diff changeset
1590 self.epilog = epilog
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diff changeset
1591 self.version = version
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1592 self.formatter_class = formatter_class
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1593 self.fromfile_prefix_chars = fromfile_prefix_chars
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diff changeset
1594 self.add_help = add_help
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diff changeset
1595
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diff changeset
1596 add_group = self.add_argument_group
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diff changeset
1597 self._positionals = add_group(_('positional arguments'))
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diff changeset
1598 self._optionals = add_group(_('optional arguments'))
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diff changeset
1599 self._subparsers = None
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1600
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diff changeset
1601 # register types
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1602 def identity(string):
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1603 return string
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1604 self.register('type', None, identity)
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1605
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1606 # add help and version arguments if necessary
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diff changeset
1607 # (using explicit default to override global argument_default)
63690
2850bd919277 #9444: use first of prefix_chars for help opt instead of raising error
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diff changeset
1608 default_prefix = '-' if '-' in prefix_chars else prefix_chars[0]
59275
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1609 if self.add_help:
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1610 self.add_argument(
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diff changeset
1611 default_prefix+'h', default_prefix*2+'help',
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1612 action='help', default=SUPPRESS,
59275
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1613 help=_('show this help message and exit'))
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1614 if self.version:
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diff changeset
1615 self.add_argument(
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diff changeset
1616 default_prefix+'v', default_prefix*2+'version',
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diff changeset
1617 action='version', default=SUPPRESS,
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1618 version=self.version,
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1619 help=_("show program's version number and exit"))
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1620
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1621 # add parent arguments and defaults
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1622 for parent in parents:
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1623 self._add_container_actions(parent)
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1624 try:
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1625 defaults = parent._defaults
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1626 except AttributeError:
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1627 pass
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1628 else:
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1629 self._defaults.update(defaults)
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1630
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1631 # =======================
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1632 # Pretty __repr__ methods
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1633 # =======================
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1634 def _get_kwargs(self):
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1635 names = [
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1636 'prog',
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1637 'usage',
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1638 'description',
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1639 'version',
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1640 'formatter_class',
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1641 'conflict_handler',
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1642 'add_help',
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1643 ]
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1644 return [(name, getattr(self, name)) for name in names]
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1645
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diff changeset
1646 # ==================================
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1647 # Optional/Positional adding methods
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1648 # ==================================
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1649 def add_subparsers(self, **kwargs):
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1650 if self._subparsers is not None:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1651 self.error(_('cannot have multiple subparser arguments'))
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1652
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1653 # add the parser class to the arguments if it's not present
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1654 kwargs.setdefault('parser_class', type(self))
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1655
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1656 if 'title' in kwargs or 'description' in kwargs:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1657 title = _(kwargs.pop('title', 'subcommands'))
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1658 description = _(kwargs.pop('description', None))
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1659 self._subparsers = self.add_argument_group(title, description)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1660 else:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1661 self._subparsers = self._positionals
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1662
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1663 # prog defaults to the usage message of this parser, skipping
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1664 # optional arguments and with no "usage:" prefix
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1665 if kwargs.get('prog') is None:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1666 formatter = self._get_formatter()
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1667 positionals = self._get_positional_actions()
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1668 groups = self._mutually_exclusive_groups
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1669 formatter.add_usage(self.usage, positionals, groups, '')
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1670 kwargs['prog'] = formatter.format_help().strip()
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1671
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1672 # create the parsers action and add it to the positionals list
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1673 parsers_class = self._pop_action_class(kwargs, 'parsers')
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1674 action = parsers_class(option_strings=[], **kwargs)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1675 self._subparsers._add_action(action)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1676
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1677 # return the created parsers action
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1678 return action
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1679
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1680 def _add_action(self, action):
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1681 if action.option_strings:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1682 self._optionals._add_action(action)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1683 else:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1684 self._positionals._add_action(action)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1685 return action
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1686
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1687 def _get_optional_actions(self):
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1688 return [action
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1689 for action in self._actions
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1690 if action.option_strings]
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1691
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1692 def _get_positional_actions(self):
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1693 return [action
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1694 for action in self._actions
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1695 if not action.option_strings]
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1696
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1697 # =====================================
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1698 # Command line argument parsing methods
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1699 # =====================================
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1700 def parse_args(self, args=None, namespace=None):
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1701 args, argv = self.parse_known_args(args, namespace)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1702 if argv:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1703 msg = _('unrecognized arguments: %s')
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1704 self.error(msg % ' '.join(argv))
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1705 return args
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1706
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1707 def parse_known_args(self, args=None, namespace=None):
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1708 # args default to the system args
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1709 if args is None:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1710 args = _sys.argv[1:]
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1711
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1712 # default Namespace built from parser defaults
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1713 if namespace is None:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1714 namespace = Namespace()
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1715
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1716 # add any action defaults that aren't present
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1717 for action in self._actions:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1718 if action.dest is not SUPPRESS:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1719 if not hasattr(namespace, action.dest):
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1720 if action.default is not SUPPRESS:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1721 default = action.default
59282
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Benjamin Peterson <benjamin@python.org>
parents: 59275
diff changeset
1722 if isinstance(action.default, str):
59275
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1723 default = self._get_value(action, default)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1724 setattr(namespace, action.dest, default)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1725
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1726 # add any parser defaults that aren't present
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1727 for dest in self._defaults:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1728 if not hasattr(namespace, dest):
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1729 setattr(namespace, dest, self._defaults[dest])
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1730
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1731 # parse the arguments and exit if there are any errors
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1732 try:
65887
ff6f39b3c38e Fix bug 9340 - argparse parse_known_args didn't work with subparsers
Steven Bethard <steven.bethard@gmail.com>
parents: 65869
diff changeset
1733 namespace, args = self._parse_known_args(args, namespace)
ff6f39b3c38e Fix bug 9340 - argparse parse_known_args didn't work with subparsers
Steven Bethard <steven.bethard@gmail.com>
parents: 65869
diff changeset
1734 if hasattr(namespace, _UNRECOGNIZED_ARGS_ATTR):
ff6f39b3c38e Fix bug 9340 - argparse parse_known_args didn't work with subparsers
Steven Bethard <steven.bethard@gmail.com>
parents: 65869
diff changeset
1735 args.extend(getattr(namespace, _UNRECOGNIZED_ARGS_ATTR))
ff6f39b3c38e Fix bug 9340 - argparse parse_known_args didn't work with subparsers
Steven Bethard <steven.bethard@gmail.com>
parents: 65869
diff changeset
1736 delattr(namespace, _UNRECOGNIZED_ARGS_ATTR)
ff6f39b3c38e Fix bug 9340 - argparse parse_known_args didn't work with subparsers
Steven Bethard <steven.bethard@gmail.com>
parents: 65869
diff changeset
1737 return namespace, args
59275
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1738 except ArgumentError:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1739 err = _sys.exc_info()[1]
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1740 self.error(str(err))
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1741
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1742 def _parse_known_args(self, arg_strings, namespace):
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1743 # replace arg strings that are file references
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1744 if self.fromfile_prefix_chars is not None:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1745 arg_strings = self._read_args_from_files(arg_strings)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1746
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1747 # map all mutually exclusive arguments to the other arguments
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1748 # they can't occur with
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1749 action_conflicts = {}
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1750 for mutex_group in self._mutually_exclusive_groups:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1751 group_actions = mutex_group._group_actions
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1752 for i, mutex_action in enumerate(mutex_group._group_actions):
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1753 conflicts = action_conflicts.setdefault(mutex_action, [])
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1754 conflicts.extend(group_actions[:i])
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1755 conflicts.extend(group_actions[i + 1:])
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1756
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1757 # find all option indices, and determine the arg_string_pattern
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1758 # which has an 'O' if there is an option at an index,
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1759 # an 'A' if there is an argument, or a '-' if there is a '--'
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1760 option_string_indices = {}
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1761 arg_string_pattern_parts = []
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1762 arg_strings_iter = iter(arg_strings)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1763 for i, arg_string in enumerate(arg_strings_iter):
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1764
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1765 # all args after -- are non-options
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1766 if arg_string == '--':
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1767 arg_string_pattern_parts.append('-')
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1768 for arg_string in arg_strings_iter:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1769 arg_string_pattern_parts.append('A')
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1770
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1771 # otherwise, add the arg to the arg strings
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1772 # and note the index if it was an option
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1773 else:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1774 option_tuple = self._parse_optional(arg_string)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1775 if option_tuple is None:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1776 pattern = 'A'
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1777 else:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1778 option_string_indices[i] = option_tuple
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1779 pattern = 'O'
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1780 arg_string_pattern_parts.append(pattern)
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diff changeset
1781
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diff changeset
1782 # join the pieces together to form the pattern
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parents: 59258
diff changeset
1783 arg_strings_pattern = ''.join(arg_string_pattern_parts)
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parents: 59258
diff changeset
1784
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parents: 59258
diff changeset
1785 # converts arg strings to the appropriate and then takes the action
59282
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Benjamin Peterson <benjamin@python.org>
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diff changeset
1786 seen_actions = set()
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diff changeset
1787 seen_non_default_actions = set()
59275
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parents: 59258
diff changeset
1788
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parents: 59258
diff changeset
1789 def take_action(action, argument_strings, option_string=None):
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1790 seen_actions.add(action)
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parents: 59258
diff changeset
1791 argument_values = self._get_values(action, argument_strings)
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parents: 59258
diff changeset
1792
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parents: 59258
diff changeset
1793 # error if this argument is not allowed with other previously
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1794 # seen arguments, assuming that actions that use the default
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1795 # value don't really count as "present"
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1796 if argument_values is not action.default:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1797 seen_non_default_actions.add(action)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1798 for conflict_action in action_conflicts.get(action, []):
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1799 if conflict_action in seen_non_default_actions:
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diff changeset
1800 msg = _('not allowed with argument %s')
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parents: 59258
diff changeset
1801 action_name = _get_action_name(conflict_action)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1802 raise ArgumentError(action, msg % action_name)
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diff changeset
1803
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diff changeset
1804 # take the action if we didn't receive a SUPPRESS value
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parents: 59258
diff changeset
1805 # (e.g. from a default)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1806 if argument_values is not SUPPRESS:
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parents: 59258
diff changeset
1807 action(self, namespace, argument_values, option_string)
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diff changeset
1808
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diff changeset
1809 # function to convert arg_strings into an optional action
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1810 def consume_optional(start_index):
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diff changeset
1811
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diff changeset
1812 # get the optional identified at this index
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parents: 59258
diff changeset
1813 option_tuple = option_string_indices[start_index]
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parents: 59258
diff changeset
1814 action, option_string, explicit_arg = option_tuple
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1815
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diff changeset
1816 # identify additional optionals in the same arg string
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parents: 59258
diff changeset
1817 # (e.g. -xyz is the same as -x -y -z if no args are required)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1818 match_argument = self._match_argument
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1819 action_tuples = []
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1820 while True:
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diff changeset
1821
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diff changeset
1822 # if we found no optional action, skip it
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parents: 59258
diff changeset
1823 if action is None:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1824 extras.append(arg_strings[start_index])
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1825 return start_index + 1
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parents: 59258
diff changeset
1826
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diff changeset
1827 # if there is an explicit argument, try to match the
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1828 # optional's string arguments to only this
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1829 if explicit_arg is not None:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1830 arg_count = match_argument(action, 'A')
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1831
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diff changeset
1832 # if the action is a single-dash option and takes no
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1833 # arguments, try to parse more single-dash options out
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1834 # of the tail of the option string
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1835 chars = self.prefix_chars
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1836 if arg_count == 0 and option_string[1] not in chars:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1837 action_tuples.append((action, [], option_string))
65867
cb9e10034e4a Fix bug 9352 where characters were being lost in parsing some short options
Steven Bethard <steven.bethard@gmail.com>
parents: 65863
diff changeset
1838 char = option_string[0]
cb9e10034e4a Fix bug 9352 where characters were being lost in parsing some short options
Steven Bethard <steven.bethard@gmail.com>
parents: 65863
diff changeset
1839 option_string = char + explicit_arg[0]
cb9e10034e4a Fix bug 9352 where characters were being lost in parsing some short options
Steven Bethard <steven.bethard@gmail.com>
parents: 65863
diff changeset
1840 new_explicit_arg = explicit_arg[1:] or None
cb9e10034e4a Fix bug 9352 where characters were being lost in parsing some short options
Steven Bethard <steven.bethard@gmail.com>
parents: 65863
diff changeset
1841 optionals_map = self._option_string_actions
cb9e10034e4a Fix bug 9352 where characters were being lost in parsing some short options
Steven Bethard <steven.bethard@gmail.com>
parents: 65863
diff changeset
1842 if option_string in optionals_map:
cb9e10034e4a Fix bug 9352 where characters were being lost in parsing some short options
Steven Bethard <steven.bethard@gmail.com>
parents: 65863
diff changeset
1843 action = optionals_map[option_string]
cb9e10034e4a Fix bug 9352 where characters were being lost in parsing some short options
Steven Bethard <steven.bethard@gmail.com>
parents: 65863
diff changeset
1844 explicit_arg = new_explicit_arg
59275
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diff changeset
1845 else:
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parents: 59258
diff changeset
1846 msg = _('ignored explicit argument %r')
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1847 raise ArgumentError(action, msg % explicit_arg)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1848
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diff changeset
1849 # if the action expect exactly one argument, we've
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1850 # successfully matched the option; exit the loop
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1851 elif arg_count == 1:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1852 stop = start_index + 1
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1853 args = [explicit_arg]
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parents: 59258
diff changeset
1854 action_tuples.append((action, args, option_string))
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1855 break
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parents: 59258
diff changeset
1856
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1857 # error if a double-dash option did not use the
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1858 # explicit argument
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diff changeset
1859 else:
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parents: 59258
diff changeset
1860 msg = _('ignored explicit argument %r')
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1861 raise ArgumentError(action, msg % explicit_arg)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1862
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parents: 59258
diff changeset
1863 # if there is no explicit argument, try to match the
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
1864 # optional's string arguments with the following strings
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parents: 59258
diff changeset
1865 # if successful, exit the loop
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parents: 59258
diff changeset
1866 else:
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parents: 59258
diff changeset
1867 start = start_index + 1
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parents: 59258
diff changeset
1868 selected_patterns = arg_strings_pattern[start:]
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parents: 59258
diff changeset
1869 arg_count = match_argument(action, selected_patterns)
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parents: 59258
diff changeset
1870 stop = start + arg_count
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diff changeset
1871 args = arg_strings[start:stop]
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diff changeset
1872 action_tuples.append((action, args, option_string))
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diff changeset
1873 break
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diff changeset
1874
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diff changeset
1875 # add the Optional to the list and return the index at which
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diff changeset
1876 # the Optional's string args stopped
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diff changeset
1877 assert action_tuples
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diff changeset
1878 for action, args, option_string in action_tuples:
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diff changeset
1879 take_action(action, args, option_string)
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diff changeset
1880 return stop
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diff changeset
1881
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diff changeset
1882 # the list of Positionals left to be parsed; this is modified
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diff changeset
1883 # by consume_positionals()
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diff changeset
1884 positionals = self._get_positional_actions()
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diff changeset
1885
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diff changeset
1886 # function to convert arg_strings into positional actions
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Benjamin Peterson <benjamin@python.org>
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diff changeset
1887 def consume_positionals(start_index):
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diff changeset
1888 # match as many Positionals as possible
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diff changeset
1889 match_partial = self._match_arguments_partial
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diff changeset
1890 selected_pattern = arg_strings_pattern[start_index:]
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diff changeset
1891 arg_counts = match_partial(positionals, selected_pattern)
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diff changeset
1892
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diff changeset
1893 # slice off the appropriate arg strings for each Positional
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diff changeset
1894 # and add the Positional and its args to the list
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diff changeset
1895 for action, arg_count in zip(positionals, arg_counts):
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diff changeset
1896 args = arg_strings[start_index: start_index + arg_count]
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diff changeset
1897 start_index += arg_count
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diff changeset
1898 take_action(action, args)
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diff changeset
1899
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diff changeset
1900 # slice off the Positionals that we just parsed and return the
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diff changeset
1901 # index at which the Positionals' string args stopped
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diff changeset
1902 positionals[:] = positionals[len(arg_counts):]
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diff changeset
1903 return start_index
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diff changeset
1904
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diff changeset
1905 # consume Positionals and Optionals alternately, until we have
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diff changeset
1906 # passed the last option string
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diff changeset
1907 extras = []
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diff changeset
1908 start_index = 0
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diff changeset
1909 if option_string_indices:
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diff changeset
1910 max_option_string_index = max(option_string_indices)
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diff changeset
1911 else:
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diff changeset
1912 max_option_string_index = -1
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diff changeset
1913 while start_index <= max_option_string_index:
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1914
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1915 # consume any Positionals preceding the next option
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1916 next_option_string_index = min([
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1917 index
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1918 for index in option_string_indices
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1919 if index >= start_index])
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1920 if start_index != next_option_string_index:
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1921 positionals_end_index = consume_positionals(start_index)
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1922
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1923 # only try to parse the next optional if we didn't consume
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1924 # the option string during the positionals parsing
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1925 if positionals_end_index > start_index:
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1926 start_index = positionals_end_index
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1927 continue
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1928 else:
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1929 start_index = positionals_end_index
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1930
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1931 # if we consumed all the positionals we could and we're not
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1932 # at the index of an option string, there were extra arguments
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1933 if start_index not in option_string_indices:
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1934 strings = arg_strings[start_index:next_option_string_index]
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1935 extras.extend(strings)
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1936 start_index = next_option_string_index
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1937
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1938 # consume the next optional and any arguments for it
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1939 start_index = consume_optional(start_index)
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1940
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1941 # consume any positionals following the last Optional
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1942 stop_index = consume_positionals(start_index)
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1943
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1944 # if we didn't consume all the argument strings, there were extras
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1945 extras.extend(arg_strings[stop_index:])
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1946
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1947 # if we didn't use all the Positional objects, there were too few
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1948 # arg strings supplied.
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1949 if positionals:
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1950 self.error(_('too few arguments'))
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1951
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1952 # make sure all required actions were present
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1953 for action in self._actions:
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1954 if action.required:
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1955 if action not in seen_actions:
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1956 name = _get_action_name(action)
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1957 self.error(_('argument %s is required') % name)
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1958
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1959 # make sure all required groups had one option present
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1960 for group in self._mutually_exclusive_groups:
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1961 if group.required:
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1962 for action in group._group_actions:
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1963 if action in seen_non_default_actions:
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1964 break
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1965
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1966 # if no actions were used, report the error
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1967 else:
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1968 names = [_get_action_name(action)
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1969 for action in group._group_actions
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1970 if action.help is not SUPPRESS]
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1971 msg = _('one of the arguments %s is required')
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1972 self.error(msg % ' '.join(names))
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1973
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1974 # return the updated namespace and the extra arguments
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1975 return namespace, extras
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1976
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1977 def _read_args_from_files(self, arg_strings):
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1978 # expand arguments referencing files
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1979 new_arg_strings = []
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1980 for arg_string in arg_strings:
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1981
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1982 # for regular arguments, just add them back into the list
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1983 if arg_string[0] not in self.fromfile_prefix_chars:
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1984 new_arg_strings.append(arg_string)
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1985
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1986 # replace arguments referencing files with the file content
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1987 else:
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1988 try:
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1989 args_file = open(arg_string[1:])
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1990 try:
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1991 arg_strings = []
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1992 for arg_line in args_file.read().splitlines():
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1993 for arg in self.convert_arg_line_to_args(arg_line):
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1994 arg_strings.append(arg)
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1995 arg_strings = self._read_args_from_files(arg_strings)
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1996 new_arg_strings.extend(arg_strings)
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1997 finally:
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1998 args_file.close()
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1999 except IOError:
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2000 err = _sys.exc_info()[1]
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2001 self.error(str(err))
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2002
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2003 # return the modified argument list
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2004 return new_arg_strings
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2005
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diff changeset
2006 def convert_arg_line_to_args(self, arg_line):
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2007 return [arg_line]
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2008
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2009 def _match_argument(self, action, arg_strings_pattern):
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2010 # match the pattern for this action to the arg strings
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2011 nargs_pattern = self._get_nargs_pattern(action)
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2012 match = _re.match(nargs_pattern, arg_strings_pattern)
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2013
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2014 # raise an exception if we weren't able to find a match
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2015 if match is None:
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2016 nargs_errors = {
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2017 None: _('expected one argument'),
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2018 OPTIONAL: _('expected at most one argument'),
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2019 ONE_OR_MORE: _('expected at least one argument'),
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2020 }
66721
1827a8ac9b18 Use proper plural forms in argparse (#4391)
Éric Araujo <merwok@netwok.org>
parents: 66661
diff changeset
2021 default = ngettext('expected %s argument',
1827a8ac9b18 Use proper plural forms in argparse (#4391)
Éric Araujo <merwok@netwok.org>
parents: 66661
diff changeset
2022 'expected %s arguments',
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Éric Araujo <merwok@netwok.org>
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diff changeset
2023 action.nargs) % action.nargs
59275
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2024 msg = nargs_errors.get(action.nargs, default)
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2025 raise ArgumentError(action, msg)
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diff changeset
2026
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2027 # return the number of arguments matched
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2028 return len(match.group(1))
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diff changeset
2029
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diff changeset
2030 def _match_arguments_partial(self, actions, arg_strings_pattern):
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diff changeset
2031 # progressively shorten the actions list by slicing off the
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diff changeset
2032 # final actions until we find a match
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diff changeset
2033 result = []
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diff changeset
2034 for i in range(len(actions), 0, -1):
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diff changeset
2035 actions_slice = actions[:i]
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diff changeset
2036 pattern = ''.join([self._get_nargs_pattern(action)
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2037 for action in actions_slice])
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diff changeset
2038 match = _re.match(pattern, arg_strings_pattern)
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2039 if match is not None:
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diff changeset
2040 result.extend([len(string) for string in match.groups()])
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2041 break
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2042
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2043 # return the list of arg string counts
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2044 return result
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2045
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2046 def _parse_optional(self, arg_string):
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2047 # if it's an empty string, it was meant to be a positional
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2048 if not arg_string:
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2049 return None
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2050
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parents: 59258
diff changeset
2051 # if it doesn't start with a prefix, it was meant to be positional
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parents: 59258
diff changeset
2052 if not arg_string[0] in self.prefix_chars:
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parents: 59258
diff changeset
2053 return None
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parents: 59258
diff changeset
2054
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parents: 59258
diff changeset
2055 # if the option string is present in the parser, return the action
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2056 if arg_string in self._option_string_actions:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2057 action = self._option_string_actions[arg_string]
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2058 return action, arg_string, None
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parents: 59258
diff changeset
2059
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2060 # if it's just a single character, it was meant to be positional
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2061 if len(arg_string) == 1:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2062 return None
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2063
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2064 # if the option string before the "=" is present, return the action
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2065 if '=' in arg_string:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2066 option_string, explicit_arg = arg_string.split('=', 1)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2067 if option_string in self._option_string_actions:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2068 action = self._option_string_actions[option_string]
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2069 return action, option_string, explicit_arg
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2070
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2071 # search through all possible prefixes of the option string
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2072 # and all actions in the parser for possible interpretations
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2073 option_tuples = self._get_option_tuples(arg_string)
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2074
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parents: 59258
diff changeset
2075 # if multiple actions match, the option string was ambiguous
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2076 if len(option_tuples) > 1:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2077 options = ', '.join([option_string
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2078 for action, option_string, explicit_arg in option_tuples])
66661
4c9844732925 Allow translators to reorder placeholders in localizable messages from
Éric Araujo <merwok@netwok.org>
parents: 66655
diff changeset
2079 args = {'option': arg_string, 'matches': options}
4c9844732925 Allow translators to reorder placeholders in localizable messages from
Éric Araujo <merwok@netwok.org>
parents: 66655
diff changeset
2080 msg = _('ambiguous option: %(option)s could match %(matches)s')
4c9844732925 Allow translators to reorder placeholders in localizable messages from
Éric Araujo <merwok@netwok.org>
parents: 66655
diff changeset
2081 self.error(msg % args)
59275
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diff changeset
2082
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2083 # if exactly one action matched, this segmentation is good,
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2084 # so return the parsed action
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parents: 59258
diff changeset
2085 elif len(option_tuples) == 1:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2086 option_tuple, = option_tuples
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parents: 59258
diff changeset
2087 return option_tuple
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parents: 59258
diff changeset
2088
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parents: 59258
diff changeset
2089 # if it was not found as an option, but it looks like a negative
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2090 # number, it was meant to be positional
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2091 # unless there are negative-number-like options
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2092 if self._negative_number_matcher.match(arg_string):
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parents: 59258
diff changeset
2093 if not self._has_negative_number_optionals:
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parents: 59258
diff changeset
2094 return None
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2095
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parents: 59258
diff changeset
2096 # if it contains a space, it was meant to be a positional
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2097 if ' ' in arg_string:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2098 return None
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2099
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parents: 59258
diff changeset
2100 # it was meant to be an optional but there is no such option
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2101 # in this parser (though it might be a valid option in a subparser)
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parents: 59258
diff changeset
2102 return None, arg_string, None
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2103
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parents: 59258
diff changeset
2104 def _get_option_tuples(self, option_string):
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diff changeset
2105 result = []
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parents: 59258
diff changeset
2106
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parents: 59258
diff changeset
2107 # option strings starting with two prefix characters are only
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2108 # split at the '='
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2109 chars = self.prefix_chars
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parents: 59258
diff changeset
2110 if option_string[0] in chars and option_string[1] in chars:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2111 if '=' in option_string:
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parents: 59258
diff changeset
2112 option_prefix, explicit_arg = option_string.split('=', 1)
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parents: 59258
diff changeset
2113 else:
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parents: 59258
diff changeset
2114 option_prefix = option_string
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2115 explicit_arg = None
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parents: 59258
diff changeset
2116 for option_string in self._option_string_actions:
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parents: 59258
diff changeset
2117 if option_string.startswith(option_prefix):
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parents: 59258
diff changeset
2118 action = self._option_string_actions[option_string]
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2119 tup = action, option_string, explicit_arg
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2120 result.append(tup)
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Benjamin Peterson <benjamin@python.org>
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diff changeset
2121
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2122 # single character options can be concatenated with their arguments
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2123 # but multiple character options always have to have their argument
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2124 # separate
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2125 elif option_string[0] in chars and option_string[1] not in chars:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2126 option_prefix = option_string
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2127 explicit_arg = None
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2128 short_option_prefix = option_string[:2]
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2129 short_explicit_arg = option_string[2:]
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parents: 59258
diff changeset
2130
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diff changeset
2131 for option_string in self._option_string_actions:
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parents: 59258
diff changeset
2132 if option_string == short_option_prefix:
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parents: 59258
diff changeset
2133 action = self._option_string_actions[option_string]
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parents: 59258
diff changeset
2134 tup = action, option_string, short_explicit_arg
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parents: 59258
diff changeset
2135 result.append(tup)
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parents: 59258
diff changeset
2136 elif option_string.startswith(option_prefix):
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parents: 59258
diff changeset
2137 action = self._option_string_actions[option_string]
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parents: 59258
diff changeset
2138 tup = action, option_string, explicit_arg
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2139 result.append(tup)
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parents: 59258
diff changeset
2140
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2141 # shouldn't ever get here
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parents: 59258
diff changeset
2142 else:
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parents: 59258
diff changeset
2143 self.error(_('unexpected option string: %s') % option_string)
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parents: 59258
diff changeset
2144
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2145 # return the collected option tuples
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2146 return result
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2147
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parents: 59258
diff changeset
2148 def _get_nargs_pattern(self, action):
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parents: 59258
diff changeset
2149 # in all examples below, we have to allow for '--' args
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2150 # which are represented as '-' in the pattern
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2151 nargs = action.nargs
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diff changeset
2152
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diff changeset
2153 # the default (None) is assumed to be a single argument
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diff changeset
2154 if nargs is None:
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Benjamin Peterson <benjamin@python.org>
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diff changeset
2155 nargs_pattern = '(-*A-*)'
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Benjamin Peterson <benjamin@python.org>
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diff changeset
2156
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parents: 59258
diff changeset
2157 # allow zero or one arguments
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2158 elif nargs == OPTIONAL:
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Benjamin Peterson <benjamin@python.org>
parents: 59258
diff changeset
2159 nargs_pattern = '(-*A?-*)'
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parents: 59258
diff changeset
2160
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parents: 59258
diff changeset
2161 # allow zero or more arguments
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diff changeset
2162 elif nargs == ZERO_OR_MORE:
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diff changeset
2163 nargs_pattern = '(-*[A-]*)'
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diff changeset
2164
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diff changeset
2165 # allow one or more arguments
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diff changeset
2166 elif nargs == ONE_OR_MORE:
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diff changeset
2167 nargs_pattern = '(-*A[A-]*)'
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diff changeset
2168
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diff changeset
2169 # allow any number of options or arguments
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diff changeset
2170 elif nargs == REMAINDER:
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diff changeset
2171 nargs_pattern = '([-AO]*)'
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diff changeset
2172
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diff changeset
2173 # allow one argument followed by any number of options or arguments
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diff changeset
2174 elif nargs == PARSER:
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diff changeset
2175 nargs_pattern = '(-*A[-AO]*)'
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diff changeset
2176
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diff changeset
2177 # all others should be integers
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diff changeset
2178 else:
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diff changeset
2179 nargs_pattern = '(-*%s-*)' % '-*'.join('A' * nargs)
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diff changeset
2180
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diff changeset
2181 # if this is an optional action, -- is not allowed
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diff changeset
2182 if action.option_strings:
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diff changeset
2183 nargs_pattern = nargs_pattern.replace('-*', '')
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diff changeset
2184 nargs_pattern = nargs_pattern.replace('-', '')
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diff changeset
2185
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diff changeset
2186 # return the pattern
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diff changeset
2187 return nargs_pattern
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diff changeset
2188
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diff changeset
2189 # ========================
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diff changeset
2190 # Value conversion methods
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diff changeset
2191 # ========================
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2192 def _get_values(self, action, arg_strings):
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diff changeset
2193 # for everything but PARSER args, strip out '--'
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diff changeset
2194 if action.nargs not in [PARSER, REMAINDER]:
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diff changeset
2195 arg_strings = [s for s in arg_strings if s != '--']
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2196
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diff changeset
2197 # optional argument produces a default when not present
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diff changeset
2198 if not arg_strings and action.nargs == OPTIONAL:
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diff changeset
2199 if action.option_strings:
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diff changeset
2200 value = action.const
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2201 else:
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2202 value = action.default
59282
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2203 if isinstance(value, str):
59275
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diff changeset
2204 value = self._get_value(action, value)
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2205 self._check_value(action, value)
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2206
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2207 # when nargs='*' on a positional, if there were no command-line
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2208 # args, use the default if it is anything other than None
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2209 elif (not arg_strings and action.nargs == ZERO_OR_MORE and
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2210 not action.option_strings):
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2211 if action.default is not None:
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2212 value = action.default
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2213 else:
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2214 value = arg_strings
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2215 self._check_value(action, value)
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2216
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2217 # single argument or optional argument produces a single value
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2218 elif len(arg_strings) == 1 and action.nargs in [None, OPTIONAL]:
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diff changeset
2219 arg_string, = arg_strings
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2220 value = self._get_value(action, arg_string)
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2221 self._check_value(action, value)
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2222
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2223 # REMAINDER arguments convert all values, checking none
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2224 elif action.nargs == REMAINDER:
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diff changeset
2225 value = [self._get_value(action, v) for v in arg_strings]
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2226
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2227 # PARSER arguments convert all values, but check only the first
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2228 elif action.nargs == PARSER:
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2229 value = [self._get_value(action, v) for v in arg_strings]
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2230 self._check_value(action, value[0])
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2231
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2232 # all other types of nargs produce a list
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2233 else:
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2234 value = [self._get_value(action, v) for v in arg_strings]
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diff changeset
2235 for v in value:
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diff changeset
2236 self._check_value(action, v)
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diff changeset
2237
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2238 # return the converted value
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diff changeset
2239 return value
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diff changeset
2240
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2241 def _get_value(self, action, arg_string):
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2242 type_func = self._registry_get('type', action.type, action.type)
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diff changeset
2243 if not _callable(type_func):
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diff changeset
2244 msg = _('%r is not callable')
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diff changeset
2245 raise ArgumentError(action, msg % type_func)
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diff changeset
2246
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diff changeset
2247 # convert the value to the appropriate type
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diff changeset
2248 try:
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diff changeset
2249 result = type_func(arg_string)
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diff changeset
2250
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2251 # ArgumentTypeErrors indicate errors
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2252 except ArgumentTypeError:
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diff changeset
2253 name = getattr(action.type, '__name__', repr(action.type))
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diff changeset
2254 msg = str(_sys.exc_info()[1])
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diff changeset
2255 raise ArgumentError(action, msg)
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diff changeset
2256
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diff changeset
2257 # TypeErrors or ValueErrors also indicate errors
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diff changeset
2258 except (TypeError, ValueError):
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diff changeset
2259 name = getattr(action.type, '__name__', repr(action.type))
66661
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diff changeset
2260 args = {'type': name, 'value': arg_string}
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diff changeset
2261 msg = _('invalid %(type)s value: %(value)r')
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diff changeset
2262 raise ArgumentError(action, msg % args)
59275
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diff changeset
2263
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diff changeset
2264 # return the converted value
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diff changeset
2265 return result
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diff changeset
2266
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2267 def _check_value(self, action, value):
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diff changeset
2268 # converted value must be one of the choices (if specified)
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diff changeset
2269 if action.choices is not None and value not in action.choices:
66661
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diff changeset
2270 args = {'value': value,
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diff changeset
2271 'choices': ', '.join(map(repr, action.choices))}
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diff changeset
2272 msg = _('invalid choice: %(value)r (choose from %(choices)s)')
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diff changeset
2273 raise ArgumentError(action, msg % args)
59275
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diff changeset
2274
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diff changeset
2275 # =======================
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diff changeset
2276 # Help-formatting methods
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diff changeset
2277 # =======================
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diff changeset
2278 def format_usage(self):
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diff changeset
2279 formatter = self._get_formatter()
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diff changeset
2280 formatter.add_usage(self.usage, self._actions,
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diff changeset
2281 self._mutually_exclusive_groups)
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diff changeset
2282 return formatter.format_help()
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diff changeset
2283
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diff changeset
2284 def format_help(self):
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diff changeset
2285 formatter = self._get_formatter()
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diff changeset
2286
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diff changeset
2287 # usage
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diff changeset
2288 formatter.add_usage(self.usage, self._actions,
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diff changeset
2289 self._mutually_exclusive_groups)
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diff changeset
2290
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diff changeset
2291 # description
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diff changeset
2292 formatter.add_text(self.description)
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diff changeset
2293
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diff changeset
2294 # positionals, optionals and user-defined groups
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diff changeset
2295 for action_group in self._action_groups:
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diff changeset
2296 formatter.start_section(action_group.title)
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diff changeset
2297 formatter.add_text(action_group.description)
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diff changeset
2298 formatter.add_arguments(action_group._group_actions)
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diff changeset
2299 formatter.end_section()
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diff changeset
2300
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diff changeset
2301 # epilog
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2302 formatter.add_text(self.epilog)
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diff changeset
2303
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diff changeset
2304 # determine help from format above
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diff changeset
2305 return formatter.format_help()
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2306
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2307 def format_version(self):
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diff changeset
2308 import warnings
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2309 warnings.warn(
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diff changeset
2310 'The format_version method is deprecated -- the "version" '
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2311 'argument to ArgumentParser is no longer supported.',
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2312 DeprecationWarning)
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2313 formatter = self._get_formatter()
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2314 formatter.add_text(self.version)
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diff changeset
2315 return formatter.format_help()
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diff changeset
2316
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2317 def _get_formatter(self):
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diff changeset
2318 return self.formatter_class(prog=self.prog)
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2319
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2320 # =====================
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2321 # Help-printing methods
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2322 # =====================
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2323 def print_usage(self, file=None):
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2324 if file is None:
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2325 file = _sys.stdout
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2326 self._print_message(self.format_usage(), file)
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2327
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2328 def print_help(self, file=None):
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2329 if file is None:
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2330 file = _sys.stdout
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2331 self._print_message(self.format_help(), file)
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2332
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2333 def print_version(self, file=None):
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2334 import warnings
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2335 warnings.warn(
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2336 'The print_version method is deprecated -- the "version" '
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2337 'argument to ArgumentParser is no longer supported.',
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2338 DeprecationWarning)
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2339 self._print_message(self.format_version(), file)
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2340
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2341 def _print_message(self, message, file=None):
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2342 if message:
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2343 if file is None:
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2344 file = _sys.stderr
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2345 file.write(message)
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2346
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2347 # ===============
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2348 # Exiting methods
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2349 # ===============
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2350 def exit(self, status=0, message=None):
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2351 if message:
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2352 self._print_message(message, _sys.stderr)
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2353 _sys.exit(status)
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2354
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2355 def error(self, message):
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2356 """error(message: string)
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2357
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2358 Prints a usage message incorporating the message to stderr and
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2359 exits.
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2360
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2361 If you override this in a subclass, it should not return -- it
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2362 should either exit or raise an exception.
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2363 """
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2364 self.print_usage(_sys.stderr)
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2365 args = {'prog': self.prog, 'message': message}
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2366 self.exit(2, _('%(prog)s: error: %(message)s\n') % args)