Mercurial > cpython-lru_cache-weakref

annotate Lib/string.py @ 66978:aed2bbafa550 3.1

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Blocked revisions 87324 via svnmerge ........ r87324 | r.david.murray | 2010-12-16 14:08:51 -0500 (Thu, 16 Dec 2010) | 9 lines #10719: restore messages generated on invalid compileall args Before the introduction of filename arguments to compileall it gave semi useful messages about not being able to 'list' names that weren't valid directories. This fix restores that behavior. In addition to the test for this case, the patch also adds a test for the default behavior of compileall when no arguments are provided, and fixes a bug in one of the previously added tests. ........
author R. David Murray <rdmurray@bitdance.com>
date Thu, 16 Dec 2010 19:10:16 +0000
parents f3c595214abc
children 3c9232a684ae
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 """A collection of string constants.
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2
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3 Public module variables:
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4
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5 whitespace -- a string containing all ASCII whitespace
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6 ascii_lowercase -- a string containing all ASCII lowercase letters
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7 ascii_uppercase -- a string containing all ASCII uppercase letters
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8 ascii_letters -- a string containing all ASCII letters
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9 digits -- a string containing all ASCII decimal digits
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10 hexdigits -- a string containing all ASCII hexadecimal digits
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11 octdigits -- a string containing all ASCII octal digits
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12 punctuation -- a string containing all ASCII punctuation characters
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13 printable -- a string containing all ASCII characters considered printable
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14
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15 """
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16
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17 # Some strings for ctype-style character classification
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18 whitespace = ' \t\n\r\v\f'
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19 ascii_lowercase = 'abcdefghijklmnopqrstuvwxyz'
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20 ascii_uppercase = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
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21 ascii_letters = ascii_lowercase + ascii_uppercase
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22 digits = '0123456789'
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23 hexdigits = digits + 'abcdef' + 'ABCDEF'
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24 octdigits = '01234567'
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25 punctuation = """!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~"""
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26 printable = digits + ascii_letters + punctuation + whitespace
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27
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28 # Functions which aren't available as string methods.
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29
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30 # Capitalize the words in a string, e.g. " aBc dEf " -> "Abc Def".
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31 def capwords(s, sep=None):
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32 """capwords(s [,sep]) -> string
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33
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34 Split the argument into words using split, capitalize each
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35 word using capitalize, and join the capitalized words using
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36 join. If the optional second argument sep is absent or None,
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37 runs of whitespace characters are replaced by a single space
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38 and leading and trailing whitespace are removed, otherwise
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39 sep is used to split and join the words.
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40
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41 """
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42 return (sep or ' ').join(x.capitalize() for x in s.split(sep))
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43
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44
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45 # Construct a translation map for bytes.translate
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46 def maketrans(frm: bytes, to: bytes) -> bytes:
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47 """maketrans(frm, to) -> bytes
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48
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49 Return a translation table (a bytes object of length 256)
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50 suitable for use in bytes.translate where each byte in frm is
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51 mapped to the byte at the same position in to.
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52 The strings frm and to must be of the same length.
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53 """
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54 import warnings
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55 warnings.warn("string.maketrans is deprecated, use bytes.maketrans instead",
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56 DeprecationWarning, 2)
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57 if len(frm) != len(to):
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58 raise ValueError("maketrans arguments must have same length")
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59 if not (isinstance(frm, bytes) and isinstance(to, bytes)):
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60 raise TypeError("maketrans arguments must be bytes objects")
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61 L = bytearray(range(256))
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62 for i, c in enumerate(frm):
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63 L[c] = to[i]
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64 return bytes(L)
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65
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66
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67 ####################################################################
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68 import re as _re
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69
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70 class _multimap:
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71 """Helper class for combining multiple mappings.
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72
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73 Used by .{safe_,}substitute() to combine the mapping and keyword
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74 arguments.
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75 """
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76 def __init__(self, primary, secondary):
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77 self._primary = primary
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78 self._secondary = secondary
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79
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80 def __getitem__(self, key):
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81 try:
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82 return self._primary[key]
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83 except KeyError:
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84 return self._secondary[key]
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85
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86
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87 class _TemplateMetaclass(type):
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88 pattern = r"""
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89 %(delim)s(?:
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90 (?P<escaped>%(delim)s) | # Escape sequence of two delimiters
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91 (?P<named>%(id)s) | # delimiter and a Python identifier
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92 {(?P<braced>%(id)s)} | # delimiter and a braced identifier
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93 (?P<invalid>) # Other ill-formed delimiter exprs
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94 )
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95 """
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96
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97 def __init__(cls, name, bases, dct):
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98 super(_TemplateMetaclass, cls).__init__(name, bases, dct)
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99 if 'pattern' in dct:
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100 pattern = cls.pattern
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101 else:
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102 pattern = _TemplateMetaclass.pattern % {
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103 'delim' : _re.escape(cls.delimiter),
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104 'id' : cls.idpattern,
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105 }
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106 cls.pattern = _re.compile(pattern, _re.IGNORECASE | _re.VERBOSE)
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107
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108
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109 class Template(metaclass=_TemplateMetaclass):
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110 """A string class for supporting $-substitutions."""
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111
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112 delimiter = '$'
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113 idpattern = r'[_a-z][_a-z0-9]*'
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114
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115 def __init__(self, template):
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116 self.template = template
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117
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118 # Search for $$, $identifier, ${identifier}, and any bare $'s
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119
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120 def _invalid(self, mo):
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121 i = mo.start('invalid')
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122 lines = self.template[:i].splitlines(True)
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123 if not lines:
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124 colno = 1
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125 lineno = 1
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126 else:
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127 colno = i - len(''.join(lines[:-1]))
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128 lineno = len(lines)
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129 raise ValueError('Invalid placeholder in string: line %d, col %d' %
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130 (lineno, colno))
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131
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132 def substitute(self, *args, **kws):
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133 if len(args) > 1:
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134 raise TypeError('Too many positional arguments')
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135 if not args:
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136 mapping = kws
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137 elif kws:
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138 mapping = _multimap(kws, args[0])
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139 else:
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140 mapping = args[0]
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141 # Helper function for .sub()
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142 def convert(mo):
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143 # Check the most common path first.
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144 named = mo.group('named') or mo.group('braced')
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145 if named is not None:
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146 val = mapping[named]
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147 # We use this idiom instead of str() because the latter will
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148 # fail if val is a Unicode containing non-ASCII characters.
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149 return '%s' % (val,)
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150 if mo.group('escaped') is not None:
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151 return self.delimiter
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152 if mo.group('invalid') is not None:
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153 self._invalid(mo)
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154 raise ValueError('Unrecognized named group in pattern',
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155 self.pattern)
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156 return self.pattern.sub(convert, self.template)
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157
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158 def safe_substitute(self, *args, **kws):
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159 if len(args) > 1:
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160 raise TypeError('Too many positional arguments')
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161 if not args:
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162 mapping = kws
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163 elif kws:
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164 mapping = _multimap(kws, args[0])
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165 else:
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166 mapping = args[0]
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167 # Helper function for .sub()
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168 def convert(mo):
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169 named = mo.group('named')
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170 if named is not None:
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171 try:
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172 # We use this idiom instead of str() because the latter
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173 # will fail if val is a Unicode containing non-ASCII
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174 return '%s' % (mapping[named],)
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175 except KeyError:
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176 return self.delimiter + named
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177 braced = mo.group('braced')
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178 if braced is not None:
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179 try:
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180 return '%s' % (mapping[braced],)
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181 except KeyError:
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182 return self.delimiter + '{' + braced + '}'
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183 if mo.group('escaped') is not None:
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184 return self.delimiter
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185 if mo.group('invalid') is not None:
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186 return self.delimiter
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187 raise ValueError('Unrecognized named group in pattern',
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188 self.pattern)
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189 return self.pattern.sub(convert, self.template)
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190
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191
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192
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193 ########################################################################
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194 # the Formatter class
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195 # see PEP 3101 for details and purpose of this class
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196
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197 # The hard parts are reused from the C implementation. They're exposed as "_"
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198 # prefixed methods of str and unicode.
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199
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200 # The overall parser is implemented in str._formatter_parser.
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201 # The field name parser is implemented in str._formatter_field_name_split
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202
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203 class Formatter:
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204 def format(self, format_string, *args, **kwargs):
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205 return self.vformat(format_string, args, kwargs)
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206
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207 def vformat(self, format_string, args, kwargs):
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208 used_args = set()
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209 result = self._vformat(format_string, args, kwargs, used_args, 2)
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210 self.check_unused_args(used_args, args, kwargs)
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211 return result
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212
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213 def _vformat(self, format_string, args, kwargs, used_args, recursion_depth):
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214 if recursion_depth < 0:
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215 raise ValueError('Max string recursion exceeded')
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216 result = []
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217 for literal_text, field_name, format_spec, conversion in \
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218 self.parse(format_string):
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219
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220 # output the literal text
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221 if literal_text:
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222 result.append(literal_text)
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223
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224 # if there's a field, output it
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225 if field_name is not None:
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226 # this is some markup, find the object and do
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227 # the formatting
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228
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229 # given the field_name, find the object it references
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230 # and the argument it came from
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231 obj, arg_used = self.get_field(field_name, args, kwargs)
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232 used_args.add(arg_used)
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233
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234 # do any conversion on the resulting object
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235 obj = self.convert_field(obj, conversion)
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236
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237 # expand the format spec, if needed
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238 format_spec = self._vformat(format_spec, args, kwargs,
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239 used_args, recursion_depth-1)
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240
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241 # format the object and append to the result
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242 result.append(self.format_field(obj, format_spec))
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243
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244 return ''.join(result)
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245
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246
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247 def get_value(self, key, args, kwargs):
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248 if isinstance(key, int):
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249 return args[key]
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250 else:
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251 return kwargs[key]
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252
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253
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254 def check_unused_args(self, used_args, args, kwargs):
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255 pass
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256
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257
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258 def format_field(self, value, format_spec):
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259 return format(value, format_spec)
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260
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261
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262 def convert_field(self, value, conversion):
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263 # do any conversion on the resulting object
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264 if conversion == 'r':
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265 return repr(value)
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266 elif conversion == 's':
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267 return str(value)
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268 elif conversion is None:
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269 return value
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270 raise ValueError("Unknown converion specifier {0!s}".format(conversion))
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271
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272
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273 # returns an iterable that contains tuples of the form:
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274 # (literal_text, field_name, format_spec, conversion)
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275 # literal_text can be zero length
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276 # field_name can be None, in which case there's no
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277 # object to format and output
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278 # if field_name is not None, it is looked up, formatted
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279 # with format_spec and conversion and then used
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280 def parse(self, format_string):
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281 return format_string._formatter_parser()
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282
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283
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284 # given a field_name, find the object it references.
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285 # field_name: the field being looked up, e.g. "0.name"
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286 # or "lookup[3]"
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287 # used_args: a set of which args have been used
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288 # args, kwargs: as passed in to vformat
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289 def get_field(self, field_name, args, kwargs):
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290 first, rest = field_name._formatter_field_name_split()
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291
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292 obj = self.get_value(first, args, kwargs)
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293
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294 # loop through the rest of the field_name, doing
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295 # getattr or getitem as needed
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296 for is_attr, i in rest:
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297 if is_attr:
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298 obj = getattr(obj, i)
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299 else:
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300 obj = obj[i]
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301
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302 return obj, first