Mercurial > hg
annotate hgdemandimport/demandimportpy2.py @ 48946:642e31cb55f0
py3: use class X: instead of class X(object):
The inheritance from object is implied in Python 3. So this should
be equivalent.
This change was generated via an automated search and replace. So there
may have been some accidental changes.
Differential Revision: https://phab.mercurial-scm.org/D12352
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Mon, 21 Feb 2022 13:08:28 -0700 |
parents | 6000f5b25c9b |
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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 Olivia Mackall <olivia@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 |
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28 import __builtin__ as builtins |
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29 import contextlib |
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30 import sys |
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31 |
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32 from . import tracing |
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33 |
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34 contextmanager = contextlib.contextmanager |
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35 |
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36 _origimport = __import__ |
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37 |
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38 nothing = object() |
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39 |
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40 |
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41 def _hgextimport(importfunc, name, globals, *args, **kwargs): |
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42 try: |
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43 return importfunc(name, globals, *args, **kwargs) |
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44 except ImportError: |
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45 if not globals: |
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46 raise |
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47 # extensions are loaded with "hgext_" prefix |
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48 hgextname = 'hgext_%s' % name |
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49 nameroot = hgextname.split('.', 1)[0] |
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50 contextroot = globals.get('__name__', '').split('.', 1)[0] |
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51 if nameroot != contextroot: |
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52 raise |
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53 # retry to import with "hgext_" prefix |
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54 return importfunc(hgextname, globals, *args, **kwargs) |
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55 |
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56 |
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57 class _demandmod: |
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58 """module demand-loader and proxy |
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59 |
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60 Specify 1 as 'level' argument at construction, to import module |
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61 relatively. |
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62 """ |
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63 |
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64 def __init__(self, name, globals, locals, level): |
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65 if '.' in name: |
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66 head, rest = name.split('.', 1) |
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67 after = [rest] |
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68 else: |
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69 head = name |
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70 after = [] |
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71 object.__setattr__( |
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72 self, "_data", (head, globals, locals, after, level, set()) |
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73 ) |
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74 object.__setattr__(self, "_module", None) |
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75 |
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76 def _extend(self, name): |
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77 """add to the list of submodules to load""" |
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78 self._data[3].append(name) |
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79 |
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80 def _addref(self, name): |
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81 """Record that the named module ``name`` imports this module. |
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82 |
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83 References to this proxy class having the name of this module will be |
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84 replaced at module load time. We assume the symbol inside the importing |
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85 module is identical to the "head" name of this module. We don't |
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86 actually know if "as X" syntax is being used to change the symbol name |
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87 because this information isn't exposed to __import__. |
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88 """ |
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89 self._data[5].add(name) |
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90 |
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91 def _load(self): |
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92 if not self._module: |
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93 with tracing.log('demandimport %s', self._data[0]): |
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94 head, globals, locals, after, level, modrefs = self._data |
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95 mod = _hgextimport( |
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96 _origimport, head, globals, locals, None, level |
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97 ) |
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98 if mod is self: |
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99 # In this case, _hgextimport() above should imply |
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100 # _demandimport(). Otherwise, _hgextimport() never |
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101 # returns _demandmod. This isn't intentional behavior, |
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102 # in fact. (see also issue5304 for detail) |
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103 # |
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104 # If self._module is already bound at this point, self |
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105 # should be already _load()-ed while _hgextimport(). |
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106 # Otherwise, there is no way to import actual module |
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107 # as expected, because (re-)invoking _hgextimport() |
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108 # should cause same result. |
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109 # This is reason why _load() returns without any more |
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110 # setup but assumes self to be already bound. |
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111 mod = self._module |
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112 assert mod and mod is not self, "%s, %s" % (self, mod) |
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113 return |
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114 |
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115 # load submodules |
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116 def subload(mod, p): |
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117 h, t = p, None |
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118 if '.' in p: |
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119 h, t = p.split('.', 1) |
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120 if getattr(mod, h, nothing) is nothing: |
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121 setattr( |
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122 mod, |
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123 h, |
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124 _demandmod(p, mod.__dict__, mod.__dict__, level=1), |
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125 ) |
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126 elif t: |
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127 subload(getattr(mod, h), t) |
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128 |
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129 for x in after: |
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130 subload(mod, x) |
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131 |
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132 # Replace references to this proxy instance with the |
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133 # actual module. |
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134 if locals: |
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135 if locals.get(head) is self: |
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136 locals[head] = mod |
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137 elif locals.get(head + 'mod') is self: |
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138 locals[head + 'mod'] = mod |
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139 |
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140 for modname in modrefs: |
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141 modref = sys.modules.get(modname, None) |
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142 if modref and getattr(modref, head, None) is self: |
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143 setattr(modref, head, mod) |
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144 |
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145 object.__setattr__(self, "_module", mod) |
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146 |
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147 def __repr__(self): |
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148 if self._module: |
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149 return "<proxied module '%s'>" % self._data[0] |
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150 return "<unloaded module '%s'>" % self._data[0] |
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151 |
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152 def __call__(self, *args, **kwargs): |
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153 raise TypeError("%s object is not callable" % repr(self)) |
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154 |
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155 def __getattr__(self, attr): |
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156 self._load() |
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157 return getattr(self._module, attr) |
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158 |
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159 def __setattr__(self, attr, val): |
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160 self._load() |
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161 setattr(self._module, attr, val) |
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162 |
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163 @property |
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164 def __dict__(self): |
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165 self._load() |
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166 return self._module.__dict__ |
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167 |
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168 @property |
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169 def __doc__(self): |
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170 self._load() |
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171 return self._module.__doc__ |
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172 |
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173 |
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174 _pypy = '__pypy__' in sys.builtin_module_names |
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175 |
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176 |
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177 def _demandimport(name, globals=None, locals=None, fromlist=None, level=-1): |
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178 if locals is None or name in ignores or fromlist == ('*',): |
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179 # these cases we can't really delay |
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180 return _hgextimport(_origimport, name, globals, locals, fromlist, level) |
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181 elif not fromlist: |
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182 # import a [as b] |
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183 if '.' in name: # a.b |
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184 base, rest = name.split('.', 1) |
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185 # email.__init__ loading email.mime |
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186 if globals and globals.get('__name__', None) == base: |
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187 return _origimport(name, globals, locals, fromlist, level) |
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188 # if a is already demand-loaded, add b to its submodule list |
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189 if base in locals: |
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190 if isinstance(locals[base], _demandmod): |
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191 locals[base]._extend(rest) |
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192 return locals[base] |
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193 return _demandmod(name, globals, locals, level) |
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194 else: |
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195 # There is a fromlist. |
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196 # from a import b,c,d |
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197 # from . import b,c,d |
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198 # from .a import b,c,d |
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199 |
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200 # level == -1: relative and absolute attempted (Python 2 only). |
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201 # level >= 0: absolute only (Python 2 w/ absolute_import and Python 3). |
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202 # The modern Mercurial convention is to use absolute_import everywhere, |
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203 # so modern Mercurial code will have level >= 0. |
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204 |
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205 # The name of the module the import statement is located in. |
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206 globalname = globals.get('__name__') |
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207 |
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208 def processfromitem(mod, attr): |
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209 """Process an imported symbol in the import statement. |
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210 |
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211 If the symbol doesn't exist in the parent module, and if the |
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212 parent module is a package, it must be a module. We set missing |
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213 modules up as _demandmod instances. |
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214 """ |
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215 symbol = getattr(mod, attr, nothing) |
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216 nonpkg = getattr(mod, '__path__', nothing) is nothing |
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217 if symbol is nothing: |
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218 if nonpkg: |
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219 # do not try relative import, which would raise ValueError, |
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220 # and leave unknown attribute as the default __import__() |
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221 # would do. the missing attribute will be detected later |
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222 # while processing the import statement. |
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223 return |
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224 mn = '%s.%s' % (mod.__name__, attr) |
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225 if mn in ignores: |
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226 importfunc = _origimport |
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227 else: |
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228 importfunc = _demandmod |
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229 symbol = importfunc(attr, mod.__dict__, locals, level=1) |
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230 setattr(mod, attr, symbol) |
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231 |
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232 # Record the importing module references this symbol so we can |
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233 # replace the symbol with the actual module instance at load |
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234 # time. |
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235 if globalname and isinstance(symbol, _demandmod): |
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236 symbol._addref(globalname) |
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237 |
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238 def chainmodules(rootmod, modname): |
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239 # recurse down the module chain, and return the leaf module |
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240 mod = rootmod |
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241 for comp in modname.split('.')[1:]: |
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242 obj = getattr(mod, comp, nothing) |
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243 if obj is nothing: |
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244 obj = _demandmod(comp, mod.__dict__, mod.__dict__, level=1) |
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245 setattr(mod, comp, obj) |
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246 elif mod.__name__ + '.' + comp in sys.modules: |
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247 # prefer loaded module over attribute (issue5617) |
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248 obj = sys.modules[mod.__name__ + '.' + comp] |
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249 mod = obj |
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250 return mod |
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251 |
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252 if level >= 0: |
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253 if name: |
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254 # "from a import b" or "from .a import b" style |
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255 rootmod = _hgextimport( |
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256 _origimport, name, globals, locals, level=level |
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257 ) |
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258 mod = chainmodules(rootmod, name) |
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259 elif _pypy: |
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260 # PyPy's __import__ throws an exception if invoked |
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261 # with an empty name and no fromlist. Recreate the |
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262 # desired behaviour by hand. |
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263 mn = globalname |
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264 mod = sys.modules[mn] |
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265 if getattr(mod, '__path__', nothing) is nothing: |
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266 mn = mn.rsplit('.', 1)[0] |
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267 mod = sys.modules[mn] |
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268 if level > 1: |
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269 mn = mn.rsplit('.', level - 1)[0] |
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270 mod = sys.modules[mn] |
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271 else: |
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272 mod = _hgextimport( |
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273 _origimport, name, globals, locals, level=level |
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274 ) |
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275 |
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276 for x in fromlist: |
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277 processfromitem(mod, x) |
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278 |
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279 return mod |
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280 |
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281 # But, we still need to support lazy loading of standard library and 3rd |
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282 # party modules. So handle level == -1. |
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283 mod = _hgextimport(_origimport, name, globals, locals) |
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284 mod = chainmodules(mod, name) |
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285 |
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286 for x in fromlist: |
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287 processfromitem(mod, x) |
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288 |
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289 return mod |
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290 |
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291 |
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292 ignores = set() |
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293 |
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294 |
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295 def init(ignoreset): |
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296 global ignores |
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297 ignores = ignoreset |
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298 |
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299 |
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300 def isenabled(): |
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301 return builtins.__import__ == _demandimport |
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302 |
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303 |
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304 def enable(): |
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305 """enable global demand-loading of modules""" |
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306 builtins.__import__ = _demandimport |
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307 |
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308 |
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309 def disable(): |
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310 """disable global demand-loading of modules""" |
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311 builtins.__import__ = _origimport |
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312 |
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313 |
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314 @contextmanager |
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315 def deactivated(): |
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316 """context manager for disabling demandimport in 'with' blocks""" |
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317 demandenabled = isenabled() |
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318 if demandenabled: |
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319 disable() |
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320 |
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321 try: |
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322 yield |
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323 finally: |
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324 if demandenabled: |
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325 enable() |