eric6/DebugClients/Python/FlexCompleter.py

Wed, 17 Jun 2020 20:18:54 +0200

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Wed, 17 Jun 2020 20:18:54 +0200
changeset 7628
f904d0eef264
parent 7250
d8bdc55aee1a
child 7639
422fd05e9c91
permissions
-rw-r--r--

Checked the reported security related issue reports generated by the new security checker.

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1 # -*- coding: utf-8 -*-
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2
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3 """
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4 Word completion for the eric6 shell.
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5
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6 <h4>NOTE for eric6 variant</h4>
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7
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8 This version is a re-implementation of rlcompleter
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9 as found in the Python3 library. It is modified to work with the eric6
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10 debug clients.
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11
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12 <h4>Original rlcompleter documentation</h4>
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13
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14 This requires the latest extension to the readline module. The completer
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15 completes keywords, built-ins and globals in a selectable namespace (which
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16 defaults to __main__); when completing NAME.NAME..., it evaluates (!) the
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17 expression up to the last dot and completes its attributes.
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18
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19 It's very cool to do "import sys" type "sys.", hit the
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20 completion key (twice), and see the list of names defined by the
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21 sys module!
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22
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23 Tip: to use the tab key as the completion key, call
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24
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25 readline.parse_and_bind("tab: complete")
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26
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27 <b>Notes</b>:
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28 <ul>
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29 <li>
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30 Exceptions raised by the completer function are *ignored* (and
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31 generally cause the completion to fail). This is a feature -- since
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32 readline sets the tty device in raw (or cbreak) mode, printing a
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33 traceback wouldn't work well without some complicated hoopla to save,
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34 reset and restore the tty state.
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35 </li>
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36 <li>
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37 The evaluation of the NAME.NAME... form may cause arbitrary
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38 application defined code to be executed if an object with a
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39 __getattr__ hook is found. Since it is the responsibility of the
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40 application (or the user) to enable this feature, I consider this an
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41 acceptable risk. More complicated expressions (e.g. function calls or
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42 indexing operations) are *not* evaluated.
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43 </li>
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44 <li>
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45 When the original stdin is not a tty device, GNU readline is never
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46 used, and this module (and the readline module) are silently inactive.
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47 </li>
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48 </ul>
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49 """
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50
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51 try:
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52 import __builtin__ as builtins
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53 except ImportError:
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54 import builtins
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55
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56 import __main__
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57
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58 __all__ = ["Completer"]
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59
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60
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61 class Completer(object):
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62 """
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63 Class implementing the command line completer object.
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64 """
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65 def __init__(self, namespace=None):
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66 """
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67 Constructor
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68
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69 Completer([namespace]) -> completer instance.
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70
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71 If unspecified, the default namespace where completions are performed
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72 is __main__ (technically, __main__.__dict__). Namespaces should be
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73 given as dictionaries.
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74
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75 Completer instances should be used as the completion mechanism of
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76 readline via the set_completer() call:
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77
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78 readline.set_completer(Completer(my_namespace).complete)
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79
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80 @param namespace The namespace for the completer.
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81 @exception TypeError raised to indicate a wrong data structure of
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82 the namespace object
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83 """
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84 if namespace and not isinstance(namespace, dict):
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85 raise TypeError('namespace must be a dictionary')
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86
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87 # Don't bind to namespace quite yet, but flag whether the user wants a
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88 # specific namespace or to use __main__.__dict__. This will allow us
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89 # to bind to __main__.__dict__ at completion time, not now.
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90 if namespace is None:
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91 self.use_main_ns = True
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92 else:
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93 self.use_main_ns = False
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94 self.namespace = namespace
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95
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96 def complete(self, text, state):
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97 """
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98 Public method to return the next possible completion for 'text'.
0
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99
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100 This is called successively with state == 0, 1, 2, ... until it
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101 returns None. The completion should begin with 'text'.
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102
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103 @param text The text to be completed. (string)
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104 @param state The state of the completion. (integer)
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105 @return The possible completions as a list of strings.
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106 """
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107 if self.use_main_ns:
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108 self.namespace = __main__.__dict__
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109
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110 if state == 0:
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111 if "." in text:
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112 self.matches = self.attr_matches(text)
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113 else:
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114 self.matches = self.global_matches(text)
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115 try:
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116 return self.matches[state]
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117 except IndexError:
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118 return None
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119
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120 def _callable_postfix(self, val, word):
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121 """
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122 Protected method to check for a callable.
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123
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124 @param val value to check (object)
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125 @param word word to ammend (string)
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126 @return ammended word (string)
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127 """
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128 if callable(val):
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129 word = word + "("
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130 return word
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131
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132 def global_matches(self, text):
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133 """
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134 Public method to compute matches when text is a simple name.
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135
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136 @param text The text to be completed. (string)
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137 @return A list of all keywords, built-in functions and names currently
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138 defined in self.namespace that match.
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139 """
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140 import keyword
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141 matches = []
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142 seen = {"__builtins__"}
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143 n = len(text)
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144 for word in keyword.kwlist:
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145 if word[:n] == text:
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146 seen.add(word)
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147 if word in {'finally', 'try'}:
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148 word = word + ':'
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149 elif word not in {'False', 'None', 'True',
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150 'break', 'continue', 'pass',
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151 'else'}:
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152 word = word + ' '
0
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153 matches.append(word)
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154 for nspace in [builtins.__dict__, self.namespace]:
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155 for word, val in nspace.items():
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156 if word[:n] == text and word not in seen:
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157 seen.add(word)
0
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158 matches.append(self._callable_postfix(val, word))
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159 return matches
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160
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161 def attr_matches(self, text):
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162 """
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163 Public method to compute matches when text contains a dot.
0
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164
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165 Assuming the text is of the form NAME.NAME....[NAME], and is
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166 evaluatable in self.namespace, it will be evaluated and its attributes
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167 (as revealed by dir()) are used as possible completions. (For class
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168 instances, class members are are also considered.)
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169
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170 <b>WARNING</b>: this can still invoke arbitrary C code, if an object
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171 with a __getattr__ hook is evaluated.
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172
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173 @param text The text to be completed. (string)
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174 @return A list of all matches.
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175 """
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176 import re
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177
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178 m = re.match(r"(\w+(\.\w+)*)\.(\w*)", text)
0
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179 if not m:
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180 return []
0
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181 expr, attr = m.group(1, 3)
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182 try:
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183 thisobject = eval(expr, self.namespace) # secok
0
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184 except Exception:
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185 return []
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186
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187 # get the content of the object, except __builtins__
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188 words = set(dir(thisobject))
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189 words.discard("__builtins__")
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190
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191 if hasattr(object, '__class__'):
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192 words.add('__class__')
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193 words.update(get_class_members(thisobject.__class__))
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194 matches = []
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195 n = len(attr)
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196 if attr == '':
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197 noprefix = '_'
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198 elif attr == '_':
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199 noprefix = '__'
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200 else:
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201 noprefix = None
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202 while True:
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203 for word in words:
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204 if (word[:n] == attr and
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205 not (noprefix and word[:n + 1] == noprefix)):
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206 match = "{0}.{1}".format(expr, word)
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207 try:
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208 val = getattr(thisobject, word)
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209 except Exception: # secok
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210 pass # Include even if attribute not set
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211 else:
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212 match = self._callable_postfix(val, match)
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213 matches.append(match)
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214 if matches or not noprefix:
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215 break
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216 if noprefix == '_':
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217 noprefix = '__'
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diff changeset
218 else:
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219 noprefix = None
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220 matches.sort()
0
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221 return matches
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222
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diff changeset
223
0
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224 def get_class_members(klass):
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225 """
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226 Module function to retrieve the class members.
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227
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228 @param klass The class object to be analysed.
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229 @return A list of all names defined in the class.
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230 """
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231 ret = dir(klass)
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diff changeset
232 if hasattr(klass, '__bases__'):
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233 for base in klass.__bases__:
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diff changeset
234 ret = ret + get_class_members(base)
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235 return ret
4543
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236
2e6a880670e9 Fixed a few code style issues (forgotten future imports, copyrights,...).
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237 #
2e6a880670e9 Fixed a few code style issues (forgotten future imports, copyrights,...).
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238 # eflag: noqa = M702, M111

eric ide

mercurial