Mercurial > hg > pyhgsh

annotate mercurial/demandload.py @ 2285:0912f807b7ff

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win98: fall back to win32api.GetModuleFileName if needed.
author Volker Kleinfeld <Volker.Kleinfeld@gmx.de>
date Sun, 14 May 2006 23:49:31 -0700
parents f3abe0bdccdd
children d01eac5968c6
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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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60
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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 demandload(scope, modules):
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85 '''import modules into scope when each is first used.
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86
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87 scope should be the value of globals() in the module calling this
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88 function, or locals() in the calling function.
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89
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90 modules is a string listing module names, separated by white
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91 space. names are handled like this:
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92
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93 foo import foo
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94 foo bar import foo, bar
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95 foo.bar import foo.bar
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96 foo:bar from foo import bar
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97 foo:bar,quux from foo import bar, quux
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98 foo.bar:quux from foo.bar import quux'''
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99
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100 for mod in modules.split():
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101 col = mod.find(':')
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102 if col >= 0:
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103 fromlist = mod[col+1:].split(',')
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104 mod = mod[:col]
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105 else:
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106 fromlist = []
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107 importer = _importer(scope, mod, fromlist)
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108 if fromlist:
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109 for name in fromlist:
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110 scope[name] = _replacer_from(importer, name)
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111 else:
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112 dot = mod.find('.')
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113 if dot >= 0:
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114 basemod = mod[:dot]
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115 val = scope.get(basemod)
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116 # if base module has already been demandload()ed,
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117 # remember to load this submodule into its namespace
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118 # when needed.
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119 if isinstance(val, _replacer):
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120 later = object.__getattribute__(val, 'later')
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121 later.append(mod[dot+1:])
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122 continue
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123 else:
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124 basemod = mod
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125 scope[basemod] = _replacer(importer, basemod)