Mercurial > cpython-lru_cache-weakref
annotate Lib/rlcompleter.py @ 79675:c0a2294de787 2.7
Issue #16199: Backport 2to3 typo fix from 3.2.
| author | Chris Jerdonek <chris.jerdonek@gmail.com> |
|---|---|
| date | Thu, 11 Oct 2012 16:15:46 -0700 |
| parents | 39d1c2c7bcf7 |
| children | d234dd21374a |
| rev | line source |
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Closes #14411: remove outdated comment in rlcompleter docstring.
Georg Brandl <georg@python.org>
parents:
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1 """Word completion for GNU readline. |
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2 |
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Closes #14411: remove outdated comment in rlcompleter docstring.
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parents:
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3 The completer completes keywords, built-ins and globals in a selectable |
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Closes #14411: remove outdated comment in rlcompleter docstring.
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parents:
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4 namespace (which defaults to __main__); when completing NAME.NAME..., it |
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Closes #14411: remove outdated comment in rlcompleter docstring.
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parents:
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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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Closes #14411: remove outdated comment in rlcompleter docstring.
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7 It's very cool to do "import sys" type "sys.", hit the completion key (twice), |
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Closes #14411: remove outdated comment in rlcompleter docstring.
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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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parents:
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16 - Exceptions raised by the completer function are *ignored* (and generally cause |
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parents:
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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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20 |
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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 - GNU readline is also used by the built-in functions input() and |
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28 raw_input(), and thus these also benefit/suffer from the completer |
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29 features. Clearly an interactive application can benefit by |
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30 specifying its own completer function and using raw_input() for all |
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31 its input. |
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32 |
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33 - When the original stdin is not a tty device, GNU readline is never |
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34 used, and this module (and the readline module) are silently inactive. |
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35 |
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36 """ |
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37 |
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38 import __builtin__ |
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39 import __main__ |
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40 |
| 16613 | 41 __all__ = ["Completer"] |
| 42 | |
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43 class Completer: |
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44 def __init__(self, namespace = None): |
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45 """Create a new completer for the command line. |
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46 |
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47 Completer([namespace]) -> completer instance. |
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48 |
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49 If unspecified, the default namespace where completions are performed |
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50 is __main__ (technically, __main__.__dict__). Namespaces should be |
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51 given as dictionaries. |
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52 |
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53 Completer instances should be used as the completion mechanism of |
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54 readline via the set_completer() call: |
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55 |
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56 readline.set_completer(Completer(my_namespace).complete) |
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57 """ |
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58 |
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59 if namespace and not isinstance(namespace, dict): |
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60 raise TypeError,'namespace must be a dictionary' |
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61 |
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62 # Don't bind to namespace quite yet, but flag whether the user wants a |
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63 # specific namespace or to use __main__.__dict__. This will allow us |
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64 # to bind to __main__.__dict__ at completion time, not now. |
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65 if namespace is None: |
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66 self.use_main_ns = 1 |
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67 else: |
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68 self.use_main_ns = 0 |
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69 self.namespace = namespace |
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70 |
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71 def complete(self, text, state): |
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72 """Return the next possible completion for 'text'. |
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73 |
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74 This is called successively with state == 0, 1, 2, ... until it |
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75 returns None. The completion should begin with 'text'. |
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76 |
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77 """ |
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78 if self.use_main_ns: |
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79 self.namespace = __main__.__dict__ |
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80 |
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81 if state == 0: |
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82 if "." in text: |
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83 self.matches = self.attr_matches(text) |
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84 else: |
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85 self.matches = self.global_matches(text) |
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86 try: |
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87 return self.matches[state] |
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88 except IndexError: |
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89 return None |
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90 |
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91 def _callable_postfix(self, val, word): |
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92 if hasattr(val, '__call__'): |
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93 word = word + "(" |
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94 return word |
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95 |
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96 def global_matches(self, text): |
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97 """Compute matches when text is a simple name. |
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98 |
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99 Return a list of all keywords, built-in functions and names currently |
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100 defined in self.namespace that match. |
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101 |
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102 """ |
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103 import keyword |
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104 matches = [] |
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105 n = len(text) |
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106 for word in keyword.kwlist: |
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107 if word[:n] == text: |
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108 matches.append(word) |
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109 for nspace in [__builtin__.__dict__, self.namespace]: |
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110 for word, val in nspace.items(): |
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111 if word[:n] == text and word != "__builtins__": |
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112 matches.append(self._callable_postfix(val, word)) |
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113 return matches |
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114 |
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115 def attr_matches(self, text): |
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116 """Compute matches when text contains a dot. |
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117 |
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118 Assuming the text is of the form NAME.NAME....[NAME], and is |
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119 evaluatable in self.namespace, it will be evaluated and its attributes |
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120 (as revealed by dir()) are used as possible completions. (For class |
| 30723 | 121 instances, class members are also considered.) |
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122 |
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123 WARNING: this can still invoke arbitrary C code, if an object |
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124 with a __getattr__ hook is evaluated. |
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125 |
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126 """ |
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127 import re |
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128 m = re.match(r"(\w+(\.\w+)*)\.(\w*)", text) |
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129 if not m: |
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130 return [] |
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131 expr, attr = m.group(1, 3) |
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132 try: |
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133 thisobject = eval(expr, self.namespace) |
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134 except Exception: |
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135 return [] |
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136 |
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137 # get the content of the object, except __builtins__ |
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138 words = dir(thisobject) |
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139 if "__builtins__" in words: |
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140 words.remove("__builtins__") |
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141 |
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142 if hasattr(thisobject, '__class__'): |
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143 words.append('__class__') |
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144 words.extend(get_class_members(thisobject.__class__)) |
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145 matches = [] |
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146 n = len(attr) |
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147 for word in words: |
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148 if word[:n] == attr and hasattr(thisobject, word): |
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149 val = getattr(thisobject, word) |
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150 word = self._callable_postfix(val, "%s.%s" % (expr, word)) |
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151 matches.append(word) |
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152 return matches |
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153 |
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154 def get_class_members(klass): |
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155 ret = dir(klass) |
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156 if hasattr(klass,'__bases__'): |
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157 for base in klass.__bases__: |
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158 ret = ret + get_class_members(base) |
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159 return ret |
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160 |
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161 try: |
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162 import readline |
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163 except ImportError: |
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164 pass |
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165 else: |
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166 readline.set_completer(Completer().complete) |
