Mercurial > cpython-lru_cache-weakref

annotate Lib/rlcompleter.py @ 54294:dba767bc3155 legacy-trunk

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remove mention of old ctypes version
author Benjamin Peterson <benjamin@python.org>
date Sat, 23 May 2009 20:59:09 +0000
parents 5d2cd96a196b
children 39d1c2c7bcf7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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a42b31fe976f Word completion for the new readline.set_completer() function.
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1 """Word completion for GNU readline 2.0.
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2
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3 This requires the latest extension to the readline module. The completer
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4 completes keywords, built-ins and globals in a selectable namespace (which
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5 defaults to __main__); when completing NAME.NAME..., it evaluates (!) the
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6 expression up to the last dot and completes its attributes.
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7
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8 It's very cool to do "import sys" type "sys.", hit the
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9 completion key (twice), and see the list of names defined by the
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10 sys module!
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11
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12 Tip: to use the tab key as the completion key, call
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13
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14 readline.parse_and_bind("tab: complete")
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15
a42b31fe976f Word completion for the new readline.set_completer() function.
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16 Notes:
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17
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18 - Exceptions raised by the completer function are *ignored* (and
a42b31fe976f Word completion for the new readline.set_completer() function.
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19 generally cause the completion to fail). This is a feature -- since
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20 readline sets the tty device in raw (or cbreak) mode, printing a
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21 traceback wouldn't work well without some complicated hoopla to save,
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22 reset and restore the tty state.
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23
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24 - The evaluation of the NAME.NAME... form may cause arbitrary
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25 application defined code to be executed if an object with a
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26 __getattr__ hook is found. Since it is the responsibility of the
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27 application (or the user) to enable this feature, I consider this an
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28 acceptable risk. More complicated expressions (e.g. function calls or
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29 indexing operations) are *not* evaluated.
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30
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31 - GNU readline is also used by the built-in functions input() and
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32 raw_input(), and thus these also benefit/suffer from the completer
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33 features. Clearly an interactive application can benefit by
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34 specifying its own completer function and using raw_input() for all
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35 its input.
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36
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37 - When the original stdin is not a tty device, GNU readline is never
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38 used, and this module (and the readline module) are silently inactive.
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39
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40 """
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41
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42 import __builtin__
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43 import __main__
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44
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45 __all__ = ["Completer"]
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46
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47 class Completer:
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48 def __init__(self, namespace = None):
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49 """Create a new completer for the command line.
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50
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51 Completer([namespace]) -> completer instance.
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52
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53 If unspecified, the default namespace where completions are performed
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54 is __main__ (technically, __main__.__dict__). Namespaces should be
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55 given as dictionaries.
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56
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57 Completer instances should be used as the completion mechanism of
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58 readline via the set_completer() call:
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59
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60 readline.set_completer(Completer(my_namespace).complete)
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61 """
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62
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63 if namespace and not isinstance(namespace, dict):
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64 raise TypeError,'namespace must be a dictionary'
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65
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66 # Don't bind to namespace quite yet, but flag whether the user wants a
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67 # specific namespace or to use __main__.__dict__. This will allow us
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68 # to bind to __main__.__dict__ at completion time, not now.
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69 if namespace is None:
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70 self.use_main_ns = 1
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71 else:
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72 self.use_main_ns = 0
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73 self.namespace = namespace
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74
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75 def complete(self, text, state):
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76 """Return the next possible completion for 'text'.
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77
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78 This is called successively with state == 0, 1, 2, ... until it
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79 returns None. The completion should begin with 'text'.
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80
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81 """
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82 if self.use_main_ns:
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83 self.namespace = __main__.__dict__
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84
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85 if state == 0:
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86 if "." in text:
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87 self.matches = self.attr_matches(text)
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88 else:
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89 self.matches = self.global_matches(text)
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90 try:
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91 return self.matches[state]
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92 except IndexError:
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93 return None
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94
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95 def _callable_postfix(self, val, word):
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96 if hasattr(val, '__call__'):
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97 word = word + "("
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98 return word
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99
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100 def global_matches(self, text):
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101 """Compute matches when text is a simple name.
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102
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103 Return a list of all keywords, built-in functions and names currently
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104 defined in self.namespace that match.
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105
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106 """
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107 import keyword
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108 matches = []
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109 n = len(text)
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110 for word in keyword.kwlist:
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111 if word[:n] == text:
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112 matches.append(word)
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113 for nspace in [__builtin__.__dict__, self.namespace]:
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114 for word, val in nspace.items():
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115 if word[:n] == text and word != "__builtins__":
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116 matches.append(self._callable_postfix(val, word))
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117 return matches
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118
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119 def attr_matches(self, text):
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120 """Compute matches when text contains a dot.
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121
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122 Assuming the text is of the form NAME.NAME....[NAME], and is
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123 evaluatable in self.namespace, it will be evaluated and its attributes
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124 (as revealed by dir()) are used as possible completions. (For class
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125 instances, class members are also considered.)
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126
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127 WARNING: this can still invoke arbitrary C code, if an object
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128 with a __getattr__ hook is evaluated.
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129
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130 """
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131 import re
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132 m = re.match(r"(\w+(\.\w+)*)\.(\w*)", text)
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133 if not m:
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134 return []
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135 expr, attr = m.group(1, 3)
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136 try:
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137 thisobject = eval(expr, self.namespace)
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138 except Exception:
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139 return []
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140
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141 # get the content of the object, except __builtins__
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142 words = dir(thisobject)
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143 if "__builtins__" in words:
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144 words.remove("__builtins__")
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145
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146 if hasattr(thisobject, '__class__'):
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147 words.append('__class__')
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148 words.extend(get_class_members(thisobject.__class__))
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149 matches = []
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150 n = len(attr)
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151 for word in words:
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152 if word[:n] == attr and hasattr(thisobject, word):
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153 val = getattr(thisobject, word)
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154 word = self._callable_postfix(val, "%s.%s" % (expr, word))
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155 matches.append(word)
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156 return matches
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157
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158 def get_class_members(klass):
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159 ret = dir(klass)
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160 if hasattr(klass,'__bases__'):
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161 for base in klass.__bases__:
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162 ret = ret + get_class_members(base)
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163 return ret
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164
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165 try:
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166 import readline
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167 except ImportError:
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168 pass
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169 else:
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170 readline.set_completer(Completer().complete)