Mercurial > cpython-lru_cache-weakref

annotate Lib/pyclbr.py @ 4566:6403c94de50d legacy-trunk

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Added safeguard against failure in __del__.
author Guido van Rossum <guido@python.org>
date Wed, 27 Nov 1996 19:39:58 +0000
parents 5c86f60539f7
children e9c67c192cdb
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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a169e68734ff Module with one function to read Python modules and extract class and
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1 '''Parse a Python file and retrieve classes and methods.
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2
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3 Parse enough of a Python file to recognize class and method
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4 definitions and to find out the superclasses of a class.
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5
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6 The interface consists of a single function:
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7 readmodule(module, path)
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8 module is the name of a Python module, path is an optional list of
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9 directories where the module is to be searched. If present, path is
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10 prepended to the system search path sys.path.
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11 The return value is a dictionary. The keys of the dictionary are
a169e68734ff Module with one function to read Python modules and extract class and
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12 the names of the classes defined in the module (including classes
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13 that are defined via the from XXX import YYY construct). The values
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14 are class instances of the class Class defined here.
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15
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16 A class is described by the class Class in this module. Instances
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17 of this class have the following instance variables:
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18 name -- the name of the class
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19 super -- a list of super classes (Class instances)
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20 methods -- a dictionary of methods
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21 file -- the file in which the class was defined
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22 lineno -- the line in the file on which the class statement occurred
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23 The dictionary of methods uses the method names as keys and the line
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24 numbers on which the method was defined as values.
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25 If the name of a super class is not recognized, the corresponding
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26 entry in the list of super classes is not a class instance but a
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27 string giving the name of the super class. Since import statements
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28 are recognized and imported modules are scanned as well, this
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29 shouldn't happen often.
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30
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31 BUGS
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32 Continuation lines are not dealt with at all and strings may confuse
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33 the hell out of the parser, but it usually works.'''
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34
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35 import os
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36 import sys
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37 import imp
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38 import regex
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39 import string
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40
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41 id = '\\(<id>[A-Za-z_][A-Za-z0-9_]*\\)' # match identifier
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42 blank_line = regex.compile('^[ \t]*\\($\\|#\\)')
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43 is_class = regex.symcomp('^class[ \t]+'+id+'[ \t]*\\(<sup>([^)]*)\\)?[ \t]*:')
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44 is_method = regex.symcomp('^[ \t]+def[ \t]+'+id+'[ \t]*(')
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45 is_import = regex.symcomp('^import[ \t]*\\(<imp>[^#]+\\)')
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46 is_from = regex.symcomp('^from[ \t]+'+id+'[ \t]+import[ \t]+\\(<imp>[^#]+\\)')
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47 dedent = regex.compile('^[^ \t]')
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48 indent = regex.compile('^[^ \t]*')
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49
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50 _modules = {} # cache of modules we've seen
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51
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52 # each Python class is represented by an instance of this class
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53 class Class:
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54 '''Class to represent a Python class.'''
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313637c77daa Also remember the module a class is defined in.
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55 def __init__(self, module, name, super, file, lineno):
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56 self.module = module
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57 self.name = name
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58 if super is None:
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59 super = []
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60 self.super = super
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61 self.methods = {}
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62 self.file = file
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63 self.lineno = lineno
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64
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65 def _addmethod(self, name, lineno):
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66 self.methods[name] = lineno
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67
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68 def readmodule(module, path = []):
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69 '''Read a module file and return a dictionary of classes.
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70
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71 Search for MODULE in PATH and sys.path, read and parse the
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72 module and return a dictionary with one entry for each class
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73 found in the module.'''
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74
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75 if _modules.has_key(module):
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76 # we've seen this module before...
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77 return _modules[module]
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78 if module in sys.builtin_module_names:
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79 # this is a built-in module
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80 dict = {}
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81 _modules[module] = dict
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82 return dict
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83
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84 # search the path for the module
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85 f = None
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86 suffixes = imp.get_suffixes()
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87 for dir in path + sys.path:
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88 for suff, mode, type in suffixes:
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89 file = os.path.join(dir, module + suff)
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90 try:
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91 f = open(file, mode)
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92 except IOError:
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93 pass
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94 else:
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95 # found the module
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96 break
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97 if f:
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98 break
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99 if not f:
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100 raise IOError, 'module ' + module + ' not found'
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101 if type != imp.PY_SOURCE:
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102 # not Python source, can't do anything with this module
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103 f.close()
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104 dict = {}
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105 _modules[module] = dict
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106 return dict
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107
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108 cur_class = None
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109 dict = {}
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110 _modules[module] = dict
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111 imports = []
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112 lineno = 0
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113 while 1:
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114 line = f.readline()
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115 if not line:
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116 break
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117 lineno = lineno + 1 # count lines
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118 line = line[:-1] # remove line feed
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119 if blank_line.match(line) >= 0:
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120 # ignore blank (and comment only) lines
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121 continue
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122 ## if indent.match(line) >= 0:
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123 ## indentation = len(string.expandtabs(indent.group(0), 8))
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124 if is_import.match(line) >= 0:
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125 # import module
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126 for n in string.splitfields(is_import.group('imp'), ','):
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127 n = string.strip(n)
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128 try:
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129 # recursively read the
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130 # imported module
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131 d = readmodule(n, path)
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132 except:
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133 print 'module',n,'not found'
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134 pass
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135 continue
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136 if is_from.match(line) >= 0:
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137 # from module import stuff
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138 mod = is_from.group('id')
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139 names = string.splitfields(is_from.group('imp'), ',')
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140 try:
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141 # recursively read the imported module
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142 d = readmodule(mod, path)
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143 except:
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144 print 'module',mod,'not found'
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145 continue
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146 # add any classes that were defined in the
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147 # imported module to our name space if they
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148 # were mentioned in the list
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149 for n in names:
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150 n = string.strip(n)
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151 if d.has_key(n):
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152 dict[n] = d[n]
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153 elif n == '*':
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154 # only add a name if not
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155 # already there (to mimic what
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156 # Python does internally)
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5c86f60539f7 Don't add names that start with _
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157 # also don't add names that
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158 # start with _
2867
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159 for n in d.keys():
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160 if n[0] != '_' and \
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161 not dict.has_key(n):
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162 dict[n] = d[n]
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163 continue
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164 if is_class.match(line) >= 0:
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165 # we found a class definition
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166 class_name = is_class.group('id')
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167 inherit = is_class.group('sup')
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168 if inherit:
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169 # the class inherits from other classes
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170 inherit = string.strip(inherit[1:-1])
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171 names = []
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172 for n in string.splitfields(inherit, ','):
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173 n = string.strip(n)
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174 if dict.has_key(n):
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175 # we know this super class
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176 n = dict[n]
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177 else:
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178 c = string.splitfields(n, '.')
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179 if len(c) > 1:
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180 # super class
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181 # is of the
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182 # form module.class:
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183 # look in
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184 # module for class
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185 m = c[-2]
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186 c = c[-1]
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187 if _modules.has_key(m):
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188 d = _modules[m]
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189 if d.has_key(c):
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190 n = d[c]
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191 names.append(n)
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192 inherit = names
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193 # remember this class
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194 cur_class = Class(module, class_name, inherit, file, lineno)
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195 dict[class_name] = cur_class
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196 continue
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197 if is_method.match(line) >= 0:
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198 # found a method definition
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199 if cur_class:
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200 # and we know the class it belongs to
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201 meth_name = is_method.group('id')
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202 cur_class._addmethod(meth_name, lineno)
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203 continue
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204 if dedent.match(line) >= 0:
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205 # end of class definition
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206 cur_class = None
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207 f.close()
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208 return dict