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comparison: DebugClients/Python3/FlexCompleter.py
DebugClients/Python3/FlexCompleter.py
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| 1 # -*- coding: utf-8 -*- | |
| 2 | |
| 3 """ | |
| 4 Word completion for the eric4 shell | |
| 5 | |
| 6 <h4>NOTE for eric4 variant</h4> | |
| 7 | |
| 8 This version is a re-implementation of rlcompleter | |
| 9 as found in the Python3 library. It is modified to work with the eric4 | |
| 10 debug clients. | |
| 11 | |
| 12 <h4>Original rlcompleter documentation</h4> | |
| 13 | |
| 14 This requires the latest extension to the readline module. The completer | |
| 15 completes keywords, built-ins and globals in a selectable namespace (which | |
| 16 defaults to __main__); when completing NAME.NAME..., it evaluates (!) the | |
| 17 expression up to the last dot and completes its attributes. | |
| 18 | |
| 19 It's very cool to do "import sys" type "sys.", hit the | |
| 20 completion key (twice), and see the list of names defined by the | |
| 21 sys module! | |
| 22 | |
| 23 Tip: to use the tab key as the completion key, call | |
| 24 | |
| 25 readline.parse_and_bind("tab: complete") | |
| 26 | |
| 27 <b>Notes</b>: | |
| 28 <ul> | |
| 29 <li> | |
| 30 Exceptions raised by the completer function are *ignored* (and | |
| 31 generally cause the completion to fail). This is a feature -- since | |
| 32 readline sets the tty device in raw (or cbreak) mode, printing a | |
| 33 traceback wouldn't work well without some complicated hoopla to save, | |
| 34 reset and restore the tty state. | |
| 35 </li> | |
| 36 <li> | |
| 37 The evaluation of the NAME.NAME... form may cause arbitrary | |
| 38 application defined code to be executed if an object with a | |
| 39 __getattr__ hook is found. Since it is the responsibility of the | |
| 40 application (or the user) to enable this feature, I consider this an | |
| 41 acceptable risk. More complicated expressions (e.g. function calls or | |
| 42 indexing operations) are *not* evaluated. | |
| 43 </li> | |
| 44 <li> | |
| 45 When the original stdin is not a tty device, GNU readline is never | |
| 46 used, and this module (and the readline module) are silently inactive. | |
| 47 </li> | |
| 48 </ul> | |
| 49 """ | |
| 50 | |
| 51 import builtins | |
| 52 import __main__ | |
| 53 | |
| 54 __all__ = ["Completer"] | |
| 55 | |
| 56 class Completer(object): | |
| 57 """ | |
| 58 Class implementing the command line completer object. | |
| 59 """ | |
| 60 def __init__(self, namespace = None): | |
| 61 """ | |
| 62 Create a new completer for the command line. | |
| 63 | |
| 64 Completer([namespace]) -> completer instance. | |
| 65 | |
| 66 If unspecified, the default namespace where completions are performed | |
| 67 is __main__ (technically, __main__.__dict__). Namespaces should be | |
| 68 given as dictionaries. | |
| 69 | |
| 70 Completer instances should be used as the completion mechanism of | |
| 71 readline via the set_completer() call: | |
| 72 | |
| 73 readline.set_completer(Completer(my_namespace).complete) | |
| 74 | |
| 75 @param namespace The namespace for the completer. | |
| 76 """ | |
| 77 | |
| 78 if namespace and type(namespace) != type({}): | |
| 79 raise TypeError('namespace must be a dictionary') | |
| 80 | |
| 81 # Don't bind to namespace quite yet, but flag whether the user wants a | |
| 82 # specific namespace or to use __main__.__dict__. This will allow us | |
| 83 # to bind to __main__.__dict__ at completion time, not now. | |
| 84 if namespace is None: | |
| 85 self.use_main_ns = True | |
| 86 else: | |
| 87 self.use_main_ns = False | |
| 88 self.namespace = namespace | |
| 89 | |
| 90 def complete(self, text, state): | |
| 91 """ | |
| 92 Return the next possible completion for 'text'. | |
| 93 | |
| 94 This is called successively with state == 0, 1, 2, ... until it | |
| 95 returns None. The completion should begin with 'text'. | |
| 96 | |
| 97 @param text The text to be completed. (string) | |
| 98 @param state The state of the completion. (integer) | |
| 99 @return The possible completions as a list of strings. | |
| 100 """ | |
| 101 if self.use_main_ns: | |
| 102 self.namespace = __main__.__dict__ | |
| 103 | |
| 104 if state == 0: | |
| 105 if "." in text: | |
| 106 self.matches = self.attr_matches(text) | |
| 107 else: | |
| 108 self.matches = self.global_matches(text) | |
| 109 try: | |
| 110 return self.matches[state] | |
| 111 except IndexError: | |
| 112 return None | |
| 113 | |
| 114 def _callable_postfix(self, val, word): | |
| 115 """ | |
| 116 Protected method to check for a callable. | |
| 117 | |
| 118 @param val value to check (object) | |
| 119 @param word word to ammend (string) | |
| 120 @return ammended word (string) | |
| 121 """ | |
| 122 if hasattr(val, '__call__'): | |
| 123 word = word + "(" | |
| 124 return word | |
| 125 | |
| 126 def global_matches(self, text): | |
| 127 """ | |
| 128 Compute matches when text is a simple name. | |
| 129 | |
| 130 @param text The text to be completed. (string) | |
| 131 @return A list of all keywords, built-in functions and names currently | |
| 132 defined in self.namespace that match. | |
| 133 """ | |
| 134 import keyword | |
| 135 matches = [] | |
| 136 n = len(text) | |
| 137 for word in keyword.kwlist: | |
| 138 if word[:n] == text: | |
| 139 matches.append(word) | |
| 140 for nspace in [builtins.__dict__, self.namespace]: | |
| 141 for word, val in nspace.items(): | |
| 142 if word[:n] == text and word != "__builtins__": | |
| 143 matches.append(self._callable_postfix(val, word)) | |
| 144 return matches | |
| 145 | |
| 146 def attr_matches(self, text): | |
| 147 """ | |
| 148 Compute matches when text contains a dot. | |
| 149 | |
| 150 Assuming the text is of the form NAME.NAME....[NAME], and is | |
| 151 evaluatable in self.namespace, it will be evaluated and its attributes | |
| 152 (as revealed by dir()) are used as possible completions. (For class | |
| 153 instances, class members are are also considered.) | |
| 154 | |
| 155 <b>WARNING</b>: this can still invoke arbitrary C code, if an object | |
| 156 with a __getattr__ hook is evaluated. | |
| 157 | |
| 158 @param text The text to be completed. (string) | |
| 159 @return A list of all matches. | |
| 160 """ | |
| 161 import re | |
| 162 | |
| 163 # Another option, seems to work great. Catches things like ''.<tab> | |
| 164 m = re.match(r"(\S+(\.\w+)*)\.(\w*)", text) | |
| 165 | |
| 166 if not m: | |
| 167 return | |
| 168 expr, attr = m.group(1, 3) | |
| 169 try: | |
| 170 thisobject = eval(expr, self.namespace) | |
| 171 except Exception: | |
| 172 return [] | |
| 173 | |
| 174 # get the content of the object, except __builtins__ | |
| 175 words = dir(thisobject) | |
| 176 if "__builtins__" in words: | |
| 177 words.remove("__builtins__") | |
| 178 | |
| 179 if hasattr(object,'__class__'): | |
| 180 words.append('__class__') | |
| 181 words = words + get_class_members(object.__class__) | |
| 182 matches = [] | |
| 183 n = len(attr) | |
| 184 for word in words: | |
| 185 try: | |
| 186 if word[:n] == attr and hasattr(thisobject, word): | |
| 187 val = getattr(thisobject, word) | |
| 188 word = self._callable_postfix(val, "{0}.{1}".format(expr, word)) | |
| 189 matches.append(word) | |
| 190 except: | |
| 191 # some badly behaved objects pollute dir() with non-strings, | |
| 192 # which cause the completion to fail. This way we skip the | |
| 193 # bad entries and can still continue processing the others. | |
| 194 pass | |
| 195 return matches | |
| 196 | |
| 197 def get_class_members(klass): | |
| 198 """ | |
| 199 Module function to retrieve the class members. | |
| 200 | |
| 201 @param klass The class object to be analysed. | |
| 202 @return A list of all names defined in the class. | |
| 203 """ | |
| 204 ret = dir(klass) | |
| 205 if hasattr(klass, '__bases__'): | |
| 206 for base in klass.__bases__: | |
| 207 ret = ret + get_class_members(base) | |
| 208 return ret |
