Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/demandload.py @ 4402:d1dd16256114
Update Windows build instructions.
author | Lee Cantey <lcantey@gmail.com> |
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date | Thu, 03 May 2007 14:09:09 -0700 |
parents | 61afc32c1a49 |
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1 '''Demand load modules when used, not when imported.''' |
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2 |
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3 __author__ = '''Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>. |
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4 This software may be used and distributed according to the terms |
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5 of the GNU General Public License, incorporated herein by reference.''' |
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6 |
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7 # this is based on matt's original demandload module. it is a |
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8 # complete rewrite. some time, we may need to support syntax of |
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9 # "import foo as bar". |
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10 |
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11 class _importer(object): |
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12 '''import a module. it is not imported until needed, and is |
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13 imported at most once per scope.''' |
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14 |
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15 def __init__(self, scope, modname, fromlist): |
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16 '''scope is context (globals() or locals()) in which import |
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17 should be made. modname is name of module to import. |
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18 fromlist is list of modules for "from foo import ..." |
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19 emulation.''' |
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20 |
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21 self.scope = scope |
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22 self.modname = modname |
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23 self.fromlist = fromlist |
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24 self.mod = None |
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25 |
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26 def module(self): |
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27 '''import the module if needed, and return.''' |
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28 if self.mod is None: |
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29 self.mod = __import__(self.modname, self.scope, self.scope, |
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30 self.fromlist) |
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31 del self.modname, self.fromlist |
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32 return self.mod |
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33 |
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34 class _replacer(object): |
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35 '''placeholder for a demand loaded module. demandload puts this in |
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36 a target scope. when an attribute of this object is looked up, |
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37 this object is replaced in the target scope with the actual |
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38 module. |
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39 |
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40 we use __getattribute__ to avoid namespace clashes between |
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41 placeholder object and real module.''' |
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42 |
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43 def __init__(self, importer, target): |
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44 self.importer = importer |
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45 self.target = target |
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46 # consider case where we do this: |
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47 # demandload(globals(), 'foo.bar foo.quux') |
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48 # foo will already exist in target scope when we get to |
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49 # foo.quux. so we remember that we will need to demandload |
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50 # quux into foo's scope when we really load it. |
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51 self.later = [] |
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52 |
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53 def module(self): |
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54 return object.__getattribute__(self, 'importer').module() |
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55 |
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56 def __getattribute__(self, key): |
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57 '''look up an attribute in a module and return it. replace the |
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58 name of the module in the caller\'s dict with the actual |
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59 module.''' |
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61 module = object.__getattribute__(self, 'module')() |
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62 target = object.__getattribute__(self, 'target') |
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63 importer = object.__getattribute__(self, 'importer') |
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64 later = object.__getattribute__(self, 'later') |
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65 |
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66 if later: |
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67 demandload(module.__dict__, ' '.join(later)) |
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68 |
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69 importer.scope[target] = module |
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70 |
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71 return getattr(module, key) |
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72 |
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73 class _replacer_from(_replacer): |
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74 '''placeholder for a demand loaded module. used for "from foo |
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75 import ..." emulation. semantics of this are different than |
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76 regular import, so different implementation needed.''' |
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77 |
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78 def module(self): |
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79 importer = object.__getattribute__(self, 'importer') |
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80 target = object.__getattribute__(self, 'target') |
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81 |
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82 return getattr(importer.module(), target) |
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83 |
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84 def __call__(self, *args, **kwargs): |
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85 target = object.__getattribute__(self, 'module')() |
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86 return target(*args, **kwargs) |
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87 |
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88 def demandload(scope, modules): |
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89 '''import modules into scope when each is first used. |
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90 |
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91 scope should be the value of globals() in the module calling this |
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92 function, or locals() in the calling function. |
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93 |
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94 modules is a string listing module names, separated by white |
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95 space. names are handled like this: |
262 | 96 |
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97 foo import foo |
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98 foo bar import foo, bar |
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99 foo@bar import foo as bar |
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100 foo.bar import foo.bar |
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101 foo:bar from foo import bar |
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102 foo:bar,quux from foo import bar, quux |
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103 foo.bar:quux from foo.bar import quux''' |
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105 for mod in modules.split(): |
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106 col = mod.find(':') |
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107 if col >= 0: |
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108 fromlist = mod[col+1:].split(',') |
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109 mod = mod[:col] |
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110 else: |
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111 fromlist = [] |
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112 as_ = None |
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113 if '@' in mod: |
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114 mod, as_ = mod.split("@") |
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115 importer = _importer(scope, mod, fromlist) |
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116 if fromlist: |
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117 for name in fromlist: |
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118 scope[name] = _replacer_from(importer, name) |
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119 else: |
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120 dot = mod.find('.') |
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121 if dot >= 0: |
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122 basemod = mod[:dot] |
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123 val = scope.get(basemod) |
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124 # if base module has already been demandload()ed, |
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125 # remember to load this submodule into its namespace |
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126 # when needed. |
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127 if isinstance(val, _replacer): |
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128 later = object.__getattribute__(val, 'later') |
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129 later.append(mod[dot+1:]) |
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130 continue |
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131 else: |
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132 basemod = mod |
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133 if not as_: |
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134 as_ = basemod |
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135 scope[as_] = _replacer(importer, as_) |