Mercurial > cpython-lru_cache-weakref

annotate Lib/rlcompleter.py @ 78069:a8aa77458e12 3.2

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Add c_size_t and c_ssize_t to the ctypes summary table.
author Antoine Pitrou <solipsis@pitrou.net>
date Thu, 12 Jul 2012 20:31:50 +0200
parents 37751d1cb4a8
children e07f104133d5 8d28d44f3a9a
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1 """Word completion for GNU readline.
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2
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3 The completer completes keywords, built-ins and globals in a selectable
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4 namespace (which defaults to __main__); when completing NAME.NAME..., it
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5 evaluates (!) the expression up to the last dot and completes its attributes.
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6
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7 It's very cool to do "import sys" type "sys.", hit the completion key (twice),
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8 and see the list of names defined by the sys module!
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9
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10 Tip: to use the tab key as the completion key, call
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11
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12 readline.parse_and_bind("tab: complete")
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13
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14 Notes:
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15
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16 - Exceptions raised by the completer function are *ignored* (and generally cause
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17 the completion to fail). This is a feature -- since readline sets the tty
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18 device in raw (or cbreak) mode, printing a traceback wouldn't work well
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19 without some complicated hoopla to save, reset and restore the tty state.
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21 - The evaluation of the NAME.NAME... form may cause arbitrary application
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22 defined code to be executed if an object with a __getattr__ hook is found.
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23 Since it is the responsibility of the application (or the user) to enable this
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24 feature, I consider this an acceptable risk. More complicated expressions
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25 (e.g. function calls or indexing operations) are *not* evaluated.
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26
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27 - When the original stdin is not a tty device, GNU readline is never
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28 used, and this module (and the readline module) are silently inactive.
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29
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30 """
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31
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32 import builtins
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33 import __main__
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34
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35 __all__ = ["Completer"]
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36
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37 class Completer:
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38 def __init__(self, namespace = None):
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39 """Create a new completer for the command line.
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40
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41 Completer([namespace]) -> completer instance.
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42
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43 If unspecified, the default namespace where completions are performed
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44 is __main__ (technically, __main__.__dict__). Namespaces should be
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45 given as dictionaries.
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46
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47 Completer instances should be used as the completion mechanism of
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48 readline via the set_completer() call:
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49
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50 readline.set_completer(Completer(my_namespace).complete)
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51 """
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52
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53 if namespace and not isinstance(namespace, dict):
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54 raise TypeError('namespace must be a dictionary')
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55
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56 # Don't bind to namespace quite yet, but flag whether the user wants a
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57 # specific namespace or to use __main__.__dict__. This will allow us
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58 # to bind to __main__.__dict__ at completion time, not now.
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59 if namespace is None:
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60 self.use_main_ns = 1
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61 else:
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62 self.use_main_ns = 0
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63 self.namespace = namespace
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65 def complete(self, text, state):
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66 """Return the next possible completion for 'text'.
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67
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68 This is called successively with state == 0, 1, 2, ... until it
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69 returns None. The completion should begin with 'text'.
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71 """
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72 if self.use_main_ns:
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73 self.namespace = __main__.__dict__
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74
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75 if state == 0:
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76 if "." in text:
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77 self.matches = self.attr_matches(text)
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78 else:
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79 self.matches = self.global_matches(text)
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80 try:
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81 return self.matches[state]
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82 except IndexError:
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83 return None
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84
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85 def _callable_postfix(self, val, word):
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86 if callable(val):
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87 word = word + "("
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88 return word
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89
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90 def global_matches(self, text):
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91 """Compute matches when text is a simple name.
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92
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93 Return a list of all keywords, built-in functions and names currently
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94 defined in self.namespace that match.
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95
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96 """
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97 import keyword
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98 matches = []
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99 n = len(text)
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100 for word in keyword.kwlist:
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101 if word[:n] == text:
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102 matches.append(word)
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103 for nspace in [builtins.__dict__, self.namespace]:
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104 for word, val in nspace.items():
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105 if word[:n] == text and word != "__builtins__":
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106 matches.append(self._callable_postfix(val, word))
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107 return matches
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108
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109 def attr_matches(self, text):
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110 """Compute matches when text contains a dot.
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111
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112 Assuming the text is of the form NAME.NAME....[NAME], and is
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113 evaluatable in self.namespace, it will be evaluated and its attributes
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114 (as revealed by dir()) are used as possible completions. (For class
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115 instances, class members are also considered.)
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116
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117 WARNING: this can still invoke arbitrary C code, if an object
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118 with a __getattr__ hook is evaluated.
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119
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120 """
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121 import re
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122 m = re.match(r"(\w+(\.\w+)*)\.(\w*)", text)
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123 if not m:
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124 return []
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125 expr, attr = m.group(1, 3)
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126 try:
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127 thisobject = eval(expr, self.namespace)
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128 except Exception:
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129 return []
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130
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131 # get the content of the object, except __builtins__
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132 words = dir(thisobject)
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133 if "__builtins__" in words:
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134 words.remove("__builtins__")
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135
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136 if hasattr(thisobject, '__class__'):
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137 words.append('__class__')
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138 words.extend(get_class_members(thisobject.__class__))
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139 matches = []
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140 n = len(attr)
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141 for word in words:
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142 if word[:n] == attr and hasattr(thisobject, word):
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143 val = getattr(thisobject, word)
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144 word = self._callable_postfix(val, "%s.%s" % (expr, word))
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145 matches.append(word)
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146 return matches
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147
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148 def get_class_members(klass):
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149 ret = dir(klass)
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150 if hasattr(klass,'__bases__'):
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151 for base in klass.__bases__:
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152 ret = ret + get_class_members(base)
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153 return ret
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154
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155 try:
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156 import readline
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157 except ImportError:
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158 pass
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159 else:
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160 readline.set_completer(Completer().complete)