Mercurial > hg
annotate mercurial/demandimport.py @ 24071:184a2f6f40da
bundle2.unbundle20: add compressed() method
Bundlerepo uses the compressed() method to determine whether it should write
an uncompressed temporary file. Since we don't support compressed bundle2 files
at the moment, make this method return true.
author | Eric Sumner <ericsumner@fb.com> |
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date | Thu, 05 Feb 2015 15:56:50 -0800 |
parents | 2205d00b6d2b |
children | 2e7804110b14 |
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1 # demandimport.py - global demand-loading of modules for Mercurial |
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2 # |
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3 # Copyright 2006, 2007 Matt Mackall <mpm@selenic.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 ''' |
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9 demandimport - automatic demandloading of modules |
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10 |
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11 To enable this module, do: |
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12 |
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13 import demandimport; demandimport.enable() |
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14 |
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15 Imports of the following forms will be demand-loaded: |
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16 |
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17 import a, b.c |
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18 import a.b as c |
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19 from a import b,c # a will be loaded immediately |
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20 |
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21 These imports will not be delayed: |
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22 |
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23 from a import * |
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24 b = __import__(a) |
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25 ''' |
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26 |
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27 import __builtin__, os, sys |
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28 _origimport = __import__ |
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29 |
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30 nothing = object() |
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31 |
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32 try: |
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33 # Python 3 doesn't have relative imports nor level -1. |
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34 level = -1 |
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35 if sys.version_info[0] >= 3: |
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36 level = 0 |
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37 _origimport(__builtin__.__name__, {}, {}, None, level) |
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38 except TypeError: # no level argument |
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39 def _import(name, globals, locals, fromlist, level): |
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40 "call _origimport with no level argument" |
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41 return _origimport(name, globals, locals, fromlist) |
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42 else: |
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43 _import = _origimport |
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44 |
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45 def _hgextimport(importfunc, name, globals, *args): |
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46 try: |
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47 return importfunc(name, globals, *args) |
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48 except ImportError: |
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49 if not globals: |
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50 raise |
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51 # extensions are loaded with "hgext_" prefix |
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52 hgextname = 'hgext_%s' % name |
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53 nameroot = hgextname.split('.', 1)[0] |
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54 contextroot = globals.get('__name__', '').split('.', 1)[0] |
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55 if nameroot != contextroot: |
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56 raise |
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57 # retry to import with "hgext_" prefix |
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58 return importfunc(hgextname, globals, *args) |
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59 |
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60 class _demandmod(object): |
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61 """module demand-loader and proxy""" |
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62 def __init__(self, name, globals, locals, level=level): |
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63 if '.' in name: |
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64 head, rest = name.split('.', 1) |
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65 after = [rest] |
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66 else: |
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67 head = name |
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68 after = [] |
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69 object.__setattr__(self, "_data", |
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70 (head, globals, locals, after, level)) |
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71 object.__setattr__(self, "_module", None) |
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72 def _extend(self, name): |
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73 """add to the list of submodules to load""" |
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74 self._data[3].append(name) |
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75 def _load(self): |
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76 if not self._module: |
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77 head, globals, locals, after, level = self._data |
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78 mod = _hgextimport(_import, head, globals, locals, None, level) |
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79 # load submodules |
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80 def subload(mod, p): |
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81 h, t = p, None |
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82 if '.' in p: |
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83 h, t = p.split('.', 1) |
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84 if getattr(mod, h, nothing) is nothing: |
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85 setattr(mod, h, _demandmod(p, mod.__dict__, mod.__dict__)) |
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86 elif t: |
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87 subload(getattr(mod, h), t) |
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88 |
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89 for x in after: |
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90 subload(mod, x) |
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91 |
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92 # are we in the locals dictionary still? |
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93 if locals and locals.get(head) == self: |
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94 locals[head] = mod |
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95 object.__setattr__(self, "_module", mod) |
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96 |
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97 def __repr__(self): |
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98 if self._module: |
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99 return "<proxied module '%s'>" % self._data[0] |
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100 return "<unloaded module '%s'>" % self._data[0] |
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101 def __call__(self, *args, **kwargs): |
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102 raise TypeError("%s object is not callable" % repr(self)) |
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103 def __getattribute__(self, attr): |
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104 if attr in ('_data', '_extend', '_load', '_module'): |
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105 return object.__getattribute__(self, attr) |
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106 self._load() |
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107 return getattr(self._module, attr) |
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108 def __setattr__(self, attr, val): |
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109 self._load() |
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110 setattr(self._module, attr, val) |
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111 |
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112 def _demandimport(name, globals=None, locals=None, fromlist=None, level=level): |
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113 if not locals or name in ignore or fromlist == ('*',): |
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114 # these cases we can't really delay |
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115 return _hgextimport(_import, name, globals, locals, fromlist, level) |
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116 elif not fromlist: |
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117 # import a [as b] |
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118 if '.' in name: # a.b |
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119 base, rest = name.split('.', 1) |
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120 # email.__init__ loading email.mime |
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121 if globals and globals.get('__name__', None) == base: |
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122 return _import(name, globals, locals, fromlist, level) |
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123 # if a is already demand-loaded, add b to its submodule list |
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124 if base in locals: |
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125 if isinstance(locals[base], _demandmod): |
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126 locals[base]._extend(rest) |
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127 return locals[base] |
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128 return _demandmod(name, globals, locals, level) |
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129 else: |
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130 if level != -1: |
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131 # from . import b,c,d or from .a import b,c,d |
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132 return _origimport(name, globals, locals, fromlist, level) |
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133 # from a import b,c,d |
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134 mod = _hgextimport(_origimport, name, globals, locals) |
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135 # recurse down the module chain |
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136 for comp in name.split('.')[1:]: |
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137 if getattr(mod, comp, nothing) is nothing: |
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138 setattr(mod, comp, _demandmod(comp, mod.__dict__, mod.__dict__)) |
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139 mod = getattr(mod, comp) |
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140 for x in fromlist: |
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141 # set requested submodules for demand load |
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142 if getattr(mod, x, nothing) is nothing: |
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143 setattr(mod, x, _demandmod(x, mod.__dict__, locals)) |
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144 return mod |
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145 |
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146 ignore = [ |
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147 '_hashlib', |
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148 '_xmlplus', |
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149 'fcntl', |
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150 'win32com.gen_py', |
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151 '_winreg', # 2.7 mimetypes needs immediate ImportError |
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152 'pythoncom', |
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153 # imported by tarfile, not available under Windows |
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154 'pwd', |
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155 'grp', |
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156 # imported by profile, itself imported by hotshot.stats, |
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157 # not available under Windows |
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158 'resource', |
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160 'gtk', | |
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161 # setuptools' pkg_resources.py expects "from __main__ import x" to |
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162 # raise ImportError if x not defined |
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163 '__main__', |
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164 '_ssl', # conditional imports in the stdlib, issue1964 |
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165 'rfc822', |
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166 'mimetools', |
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167 # setuptools 8 expects this module to explode early when not on windows |
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168 'distutils.msvc9compiler' |
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169 ] |
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170 |
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171 def isenabled(): |
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172 return __builtin__.__import__ == _demandimport |
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173 |
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174 def enable(): |
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175 "enable global demand-loading of modules" |
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176 if os.environ.get('HGDEMANDIMPORT') != 'disable': |
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177 __builtin__.__import__ = _demandimport |
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178 |
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179 def disable(): |
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180 "disable global demand-loading of modules" |
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181 __builtin__.__import__ = _origimport |