Mercurial > cpython-lru_cache-weakref

annotate Lib/idlelib/CallTips.py @ 79691:05c8928362ee

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Merge __next__ method link fixes with 3.3.
author Ezio Melotti <ezio.melotti@gmail.com>
date Fri, 12 Oct 2012 13:46:37 +0300
parents eea379307efa
children 181c170c6270
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 """CallTips.py - An IDLE Extension to Jog Your Memory
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2
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3 Call Tips are floating windows which display function, class, and method
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4 parameter and docstring information when you type an opening parenthesis, and
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5 which disappear when you type a closing parenthesis.
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6
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7 """
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8 import re
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9 import sys
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10 import types
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11 import inspect
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12
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13 from idlelib import CallTipWindow
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14 from idlelib.HyperParser import HyperParser
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15
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16 import __main__
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17
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18 class CallTips:
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19
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20 menudefs = [
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21 ('edit', [
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22 ("Show call tip", "<<force-open-calltip>>"),
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23 ])
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24 ]
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25
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26 def __init__(self, editwin=None):
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27 if editwin is None: # subprocess and test
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28 self.editwin = None
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29 else:
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30 self.editwin = editwin
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31 self.text = editwin.text
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32 self.active_calltip = None
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33 self._calltip_window = self._make_tk_calltip_window
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34
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35 def close(self):
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36 self._calltip_window = None
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37
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38 def _make_tk_calltip_window(self):
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39 # See __init__ for usage
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40 return CallTipWindow.CallTip(self.text)
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41
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42 def _remove_calltip_window(self, event=None):
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43 if self.active_calltip:
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44 self.active_calltip.hidetip()
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45 self.active_calltip = None
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46
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47 def force_open_calltip_event(self, event):
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48 "The user selected the menu entry or hotkey, open the tip."
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49 self.open_calltip(True)
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50
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51 def try_open_calltip_event(self, event):
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52 """Happens when it would be nice to open a CallTip, but not really
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53 necessary, for example after an opening bracket, so function calls
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54 won't be made.
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55 """
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56 self.open_calltip(False)
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57
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58 def refresh_calltip_event(self, event):
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59 if self.active_calltip and self.active_calltip.is_active():
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60 self.open_calltip(False)
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61
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62 def open_calltip(self, evalfuncs):
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63 self._remove_calltip_window()
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64
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65 hp = HyperParser(self.editwin, "insert")
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66 sur_paren = hp.get_surrounding_brackets('(')
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67 if not sur_paren:
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68 return
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69 hp.set_index(sur_paren[0])
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70 expression = hp.get_expression()
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71 if not expression:
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72 return
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73 if not evalfuncs and (expression.find('(') != -1):
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74 return
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75 argspec = self.fetch_tip(expression)
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76 if not argspec:
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77 return
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78 self.active_calltip = self._calltip_window()
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79 self.active_calltip.showtip(argspec, sur_paren[0], sur_paren[1])
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80
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81 def fetch_tip(self, expression):
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82 """Return the argument list and docstring of a function or class.
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83
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84 If there is a Python subprocess, get the calltip there. Otherwise,
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85 either this fetch_tip() is running in the subprocess or it was
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86 called in an IDLE running without the subprocess.
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87
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88 The subprocess environment is that of the most recently run script. If
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89 two unrelated modules are being edited some calltips in the current
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90 module may be inoperative if the module was not the last to run.
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91
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92 To find methods, fetch_tip must be fed a fully qualified name.
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93
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94 """
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95 try:
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96 rpcclt = self.editwin.flist.pyshell.interp.rpcclt
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97 except AttributeError:
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98 rpcclt = None
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99 if rpcclt:
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100 return rpcclt.remotecall("exec", "get_the_calltip",
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101 (expression,), {})
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102 else:
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103 return get_argspec(get_entity(expression))
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104
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105 def get_entity(expression):
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106 """Return the object corresponding to expression evaluated
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107 in a namespace spanning sys.modules and __main.dict__.
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108 """
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109 if expression:
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110 namespace = sys.modules.copy()
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111 namespace.update(__main__.__dict__)
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112 try:
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113 return eval(expression, namespace)
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114 except BaseException:
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115 # An uncaught exception closes idle, and eval can raise any
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116 # exception, especially if user classes are involved.
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117 return None
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118
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119 # The following are used in both get_argspec and tests
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120 _first_param = re.compile('(?<=\()\w*\,?\s*')
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121 _default_callable_argspec = "No docstring, see docs."
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122
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123 def get_argspec(ob):
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124 '''Return a string describing the arguments and return of a callable object.
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125
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126 For Python-coded functions and methods, the first line is introspected.
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127 Delete 'self' parameter for classes (.__init__) and bound methods.
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128 The last line is the first line of the doc string. For builtins, this typically
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129 includes the arguments in addition to the return value.
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130
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131 '''
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132 argspec = ""
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133 if hasattr(ob, '__call__'):
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134 if isinstance(ob, type):
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135 fob = getattr(ob, '__init__', None)
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136 elif isinstance(ob.__call__, types.MethodType):
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137 fob = ob.__call__
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138 else:
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139 fob = ob
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140 if isinstance(fob, (types.FunctionType, types.MethodType)):
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141 argspec = inspect.formatargspec(*inspect.getfullargspec(fob))
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142 if (isinstance(ob, (type, types.MethodType)) or
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143 isinstance(ob.__call__, types.MethodType)):
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144 argspec = _first_param.sub("", argspec)
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145
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146 if isinstance(ob.__call__, types.MethodType):
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147 doc = ob.__call__.__doc__
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148 else:
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149 doc = getattr(ob, "__doc__", "")
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150 if doc:
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151 doc = doc.lstrip()
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152 pos = doc.find("\n")
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153 if pos < 0 or pos > 70:
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154 pos = 70
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155 if argspec:
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156 argspec += "\n"
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157 argspec += doc[:pos]
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158 if not argspec:
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159 argspec = _default_callable_argspec
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160 return argspec
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161
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162 #################################################
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163 #
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164 # Test code tests CallTips.fetch_tip, get_entity, and get_argspec
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165
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166 def main():
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167 # Putting expected in docstrings results in doubled tips for test
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168 def t1(): "()"
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169 def t2(a, b=None): "(a, b=None)"
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170 def t3(a, *args): "(a, *args)"
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171 def t4(*args): "(*args)"
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172 def t5(a, b=None, *args, **kw): "(a, b=None, *args, **kw)"
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173
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174 class TC(object):
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175 "(ai=None, *b)"
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176 def __init__(self, ai=None, *b): "(self, ai=None, *b)"
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177 def t1(self): "(self)"
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178 def t2(self, ai, b=None): "(self, ai, b=None)"
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179 def t3(self, ai, *args): "(self, ai, *args)"
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180 def t4(self, *args): "(self, *args)"
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181 def t5(self, ai, b=None, *args, **kw): "(self, ai, b=None, *args, **kw)"
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182 def t6(no, self): "(no, self)"
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183 @classmethod
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184 def cm(cls, a): "(cls, a)"
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185 @staticmethod
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186 def sm(b): "(b)"
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187 def __call__(self, ci): "(self, ci)"
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188
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189 tc = TC()
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190
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191 # Python classes that inherit builtin methods
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192 class Int(int): "Int(x[, base]) -> integer"
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193 class List(list): "List() -> new empty list"
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194 # Simulate builtin with no docstring for default argspec test
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195 class SB: __call__ = None
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196
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197 __main__.__dict__.update(locals()) # required for get_entity eval()
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198
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199 num_tests = num_fail = 0
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200 tip = CallTips().fetch_tip
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201
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202 def test(expression, expected):
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203 nonlocal num_tests, num_fail
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204 num_tests += 1
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205 argspec = tip(expression)
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206 if argspec != expected:
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207 num_fail += 1
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208 fmt = "%s - expected\n%r\n - but got\n%r"
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209 print(fmt % (expression, expected, argspec))
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210
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211 def test_builtins():
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212 # if first line of a possibly multiline compiled docstring changes,
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213 # must change corresponding test string
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214 test('int', "int(x[, base]) -> integer")
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215 test('Int', Int.__doc__)
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216 test('types.MethodType', "method(function, instance)")
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217 test('list', "list() -> new empty list")
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218 test('List', List.__doc__)
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219 test('list.__new__',
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220 'T.__new__(S, ...) -> a new object with type S, a subtype of T')
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221 test('list.__init__',
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222 'x.__init__(...) initializes x; see help(type(x)) for signature')
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223 append_doc = "L.append(object) -> None -- append object to end"
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224 test('list.append', append_doc)
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225 test('[].append', append_doc)
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226 test('List.append', append_doc)
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227 test('SB()', _default_callable_argspec)
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228
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229 def test_funcs():
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230 for func in (t1, t2, t3, t4, t5, TC,):
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231 fdoc = func.__doc__
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232 test(func.__name__, fdoc + "\n" + fdoc)
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233 for func in (TC.t1, TC.t2, TC.t3, TC.t4, TC.t5, TC.t6, TC.sm,
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234 TC.__call__):
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235 fdoc = func.__doc__
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236 test('TC.'+func.__name__, fdoc + "\n" + fdoc)
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237 fdoc = TC.cm.__func__.__doc__
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238 test('TC.cm.__func__', fdoc + "\n" + fdoc)
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239
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240 def test_methods():
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241 # test that first parameter is correctly removed from argspec
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242 # using _first_param re to calculate expected masks re errors
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243 for meth, mdoc in ((tc.t1, "()"), (tc.t4, "(*args)"), (tc.t6, "(self)"),
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244 (TC.cm, "(a)"),):
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245 test('tc.'+meth.__name__, mdoc + "\n" + meth.__doc__)
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246 test('tc', "(ci)" + "\n" + tc.__call__.__doc__)
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247 # directly test that re works to delete unicode parameter name
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248 uni = "(A\u0391\u0410\u05d0\u0627\u0905\u1e00\u3042, a)" # various As
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Terry Jan Reedy <tjreedy@udel.edu>
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249 assert _first_param.sub('', uni) == '(a)'
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250
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251 def test_non_callables():
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252 # expression evaluates, but not to a callable
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253 for expr in ('0', '0.0' 'num_tests', b'num_tests', '[]', '{}'):
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254 test(expr, '')
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parents: 77316
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255 # expression does not evaluate, but raises an exception
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256 for expr in ('1a', 'xyx', 'num_tests.xyz', '[int][1]', '{0:int}[1]'):
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257 test(expr, '')
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258
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259 test_builtins()
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260 test_funcs()
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parents: 77316
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261 test_non_callables()
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262 test_methods()
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263
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264 print("%d of %d tests failed" % (num_fail, num_tests))
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cc7e914a22d9 Use inspect.py and clean up.
Kurt B. Kaiser <kbk@shore.net>
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265
cc7e914a22d9 Use inspect.py and clean up.
Kurt B. Kaiser <kbk@shore.net>
parents: 42853
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266 if __name__ == '__main__':
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267 main()