DebugClients/Python3/FlexCompleter.py

Tue, 02 Oct 2012 19:53:31 +0200

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Tue, 02 Oct 2012 19:53:31 +0200
changeset 2087
795992a5c561
parent 945
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child 2953
703452a2876f
permissions
-rw-r--r--

Made the sixth set of Qt5 compatibility changes.

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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 eric5 shell
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5
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6 <h4>NOTE for eric5 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 eric5
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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 import builtins
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52 import __main__
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53
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54 __all__ = ["Completer"]
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55
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56
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57 class Completer(object):
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58 """
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59 Class implementing the command line completer object.
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60 """
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61 def __init__(self, namespace=None):
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62 """
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63 Create a new completer for the command line.
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64
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65 Completer([namespace]) -> completer instance.
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66
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67 If unspecified, the default namespace where completions are performed
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68 is __main__ (technically, __main__.__dict__). Namespaces should be
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69 given as dictionaries.
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70
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71 Completer instances should be used as the completion mechanism of
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72 readline via the set_completer() call:
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73
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74 readline.set_completer(Completer(my_namespace).complete)
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75
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76 @param namespace The namespace for the completer.
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77 """
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78
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79 if namespace and type(namespace) != type({}):
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80 raise TypeError('namespace must be a dictionary')
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81
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82 # Don't bind to namespace quite yet, but flag whether the user wants a
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83 # specific namespace or to use __main__.__dict__. This will allow us
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84 # to bind to __main__.__dict__ at completion time, not now.
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85 if namespace is None:
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86 self.use_main_ns = True
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87 else:
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88 self.use_main_ns = False
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89 self.namespace = namespace
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90
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91 def complete(self, text, state):
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92 """
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93 Return the next possible completion for 'text'.
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94
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95 This is called successively with state == 0, 1, 2, ... until it
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96 returns None. The completion should begin with 'text'.
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97
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98 @param text The text to be completed. (string)
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99 @param state The state of the completion. (integer)
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100 @return The possible completions as a list of strings.
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101 """
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102 if self.use_main_ns:
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103 self.namespace = __main__.__dict__
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104
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105 if state == 0:
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106 if "." in text:
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107 self.matches = self.attr_matches(text)
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108 else:
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109 self.matches = self.global_matches(text)
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110 try:
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111 return self.matches[state]
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112 except IndexError:
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113 return None
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114
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115 def _callable_postfix(self, val, word):
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116 """
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117 Protected method to check for a callable.
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118
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119 @param val value to check (object)
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120 @param word word to ammend (string)
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121 @return ammended word (string)
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122 """
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123 if hasattr(val, '__call__'):
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124 word = word + "("
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125 return word
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126
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127 def global_matches(self, text):
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128 """
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129 Compute matches when text is a simple name.
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130
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131 @param text The text to be completed. (string)
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132 @return A list of all keywords, built-in functions and names currently
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133 defined in self.namespace that match.
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134 """
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135 import keyword
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136 matches = []
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137 n = len(text)
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138 for word in keyword.kwlist:
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139 if word[:n] == text:
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140 matches.append(word)
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141 for nspace in [builtins.__dict__, self.namespace]:
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142 for word, val in nspace.items():
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143 if word[:n] == text and word != "__builtins__":
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144 matches.append(self._callable_postfix(val, word))
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145 return matches
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146
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147 def attr_matches(self, text):
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148 """
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149 Compute matches when text contains a dot.
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150
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151 Assuming the text is of the form NAME.NAME....[NAME], and is
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152 evaluatable in self.namespace, it will be evaluated and its attributes
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153 (as revealed by dir()) are used as possible completions. (For class
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154 instances, class members are are also considered.)
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155
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156 <b>WARNING</b>: this can still invoke arbitrary C code, if an object
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157 with a __getattr__ hook is evaluated.
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158
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159 @param text The text to be completed. (string)
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160 @return A list of all matches.
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161 """
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162 import re
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163
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164 # Another option, seems to work great. Catches things like ''.<tab>
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165 m = re.match(r"(\S+(\.\w+)*)\.(\w*)", text)
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166
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167 if not m:
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168 return
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169 expr, attr = m.group(1, 3)
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170 try:
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171 thisobject = eval(expr, self.namespace)
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172 except Exception:
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173 return []
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174
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175 # get the content of the object, except __builtins__
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176 words = dir(thisobject)
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177 if "__builtins__" in words:
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178 words.remove("__builtins__")
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179
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180 if hasattr(object, '__class__'):
0
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181 words.append('__class__')
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182 words = words + get_class_members(object.__class__)
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183 matches = []
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184 n = len(attr)
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185 for word in words:
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186 try:
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187 if word[:n] == attr and hasattr(thisobject, word):
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188 val = getattr(thisobject, word)
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189 word = self._callable_postfix(val, "{0}.{1}".format(expr, word))
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190 matches.append(word)
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191 except:
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192 # some badly behaved objects pollute dir() with non-strings,
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193 # which cause the completion to fail. This way we skip the
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194 # bad entries and can still continue processing the others.
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195 pass
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196 return matches
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197
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198
0
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199 def get_class_members(klass):
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200 """
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201 Module function to retrieve the class members.
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202
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203 @param klass The class object to be analysed.
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204 @return A list of all names defined in the class.
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205 """
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206 ret = dir(klass)
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207 if hasattr(klass, '__bases__'):
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208 for base in klass.__bases__:
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209 ret = ret + get_class_members(base)
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210 return ret

eric ide

mercurial