Mercurial > hg
annotate mercurial/__init__.py @ 43091:127cc1f72e70
py3: stop normalizing .encode()/.decode() arguments to unicode
Now that we don't byte transform string literals, we no longer need
this transform.
While we're here, we also drop some superfluous u'' prefix in existing
callers.
Differential Revision: https://phab.mercurial-scm.org/D7011
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Sun, 06 Oct 2019 17:27:51 -0400 |
parents | 1f339b503a40 |
children | c95b2f40db7c |
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1 # __init__.py - Startup and module loading logic for Mercurial. |
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2 # |
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3 # Copyright 2015 Gregory Szorc <gregory.szorc@gmail.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import sys |
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11 |
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12 # Allow 'from mercurial import demandimport' to keep working. |
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13 import hgdemandimport |
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14 |
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15 demandimport = hgdemandimport |
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16 |
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17 __all__ = [] |
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18 |
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19 # Python 3 uses a custom module loader that transforms source code between |
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20 # source file reading and compilation. This is done by registering a custom |
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21 # finder that changes the spec for Mercurial modules to use a custom loader. |
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22 if sys.version_info[0] >= 3: |
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23 import importlib |
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24 import importlib.abc |
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25 import io |
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26 import token |
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27 import tokenize |
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28 |
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29 class hgpathentryfinder(importlib.abc.MetaPathFinder): |
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30 """A sys.meta_path finder that uses a custom module loader.""" |
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31 |
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32 def find_spec(self, fullname, path, target=None): |
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33 # Only handle Mercurial-related modules. |
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34 if not fullname.startswith(('mercurial.', 'hgext.')): |
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35 return None |
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36 # don't try to parse binary |
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37 if fullname.startswith('mercurial.cext.'): |
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38 return None |
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39 # third-party packages are expected to be dual-version clean |
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40 if fullname.startswith('mercurial.thirdparty'): |
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41 return None |
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42 # zstd is already dual-version clean, don't try and mangle it |
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43 if fullname.startswith('mercurial.zstd'): |
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44 return None |
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45 # rustext is built for the right python version, |
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46 # don't try and mangle it |
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47 if fullname.startswith('mercurial.rustext'): |
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48 return None |
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49 # pywatchman is already dual-version clean, don't try and mangle it |
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50 if fullname.startswith('hgext.fsmonitor.pywatchman'): |
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51 return None |
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52 |
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53 # Try to find the module using other registered finders. |
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54 spec = None |
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55 for finder in sys.meta_path: |
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56 if finder == self: |
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57 continue |
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58 |
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59 # Originally the API was a `find_module` method, but it was |
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60 # renamed to `find_spec` in python 3.4, with a new `target` |
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61 # argument. |
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62 find_spec_method = getattr(finder, 'find_spec', None) |
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63 if find_spec_method: |
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64 spec = find_spec_method(fullname, path, target=target) |
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65 else: |
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66 spec = finder.find_module(fullname) |
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67 if spec is not None: |
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68 spec = importlib.util.spec_from_loader(fullname, spec) |
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69 if spec: |
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70 break |
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71 |
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72 # This is a Mercurial-related module but we couldn't find it |
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73 # using the previously-registered finders. This likely means |
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74 # the module doesn't exist. |
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75 if not spec: |
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76 return None |
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77 |
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78 # TODO need to support loaders from alternate specs, like zip |
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79 # loaders. |
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80 loader = hgloader(spec.name, spec.origin) |
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81 # Can't use util.safehasattr here because that would require |
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82 # importing util, and we're in import code. |
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83 if hasattr(spec.loader, 'loader'): # hasattr-py3-only |
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84 # This is a nested loader (maybe a lazy loader?) |
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85 spec.loader.loader = loader |
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86 else: |
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87 spec.loader = loader |
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88 return spec |
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89 |
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90 def replacetokens(tokens, fullname): |
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91 """Transform a stream of tokens from raw to Python 3. |
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92 |
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93 It is called by the custom module loading machinery to rewrite |
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94 source/tokens between source decoding and compilation. |
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95 |
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96 Returns a generator of possibly rewritten tokens. |
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97 |
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98 The input token list may be mutated as part of processing. However, |
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99 its changes do not necessarily match the output token stream. |
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100 |
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101 REMEMBER TO CHANGE ``BYTECODEHEADER`` WHEN CHANGING THIS FUNCTION |
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102 OR CACHED FILES WON'T GET INVALIDATED PROPERLY. |
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103 """ |
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104 # The following utility functions access the tokens list and i index of |
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105 # the for i, t enumerate(tokens) loop below |
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106 def _isop(j, *o): |
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107 """Assert that tokens[j] is an OP with one of the given values""" |
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108 try: |
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109 return tokens[j].type == token.OP and tokens[j].string in o |
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110 except IndexError: |
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111 return False |
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112 |
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113 def _findargnofcall(n): |
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114 """Find arg n of a call expression (start at 0) |
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115 |
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116 Returns index of the first token of that argument, or None if |
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117 there is not that many arguments. |
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118 |
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119 Assumes that token[i + 1] is '('. |
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120 |
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121 """ |
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122 nested = 0 |
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123 for j in range(i + 2, len(tokens)): |
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124 if _isop(j, ')', ']', '}'): |
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125 # end of call, tuple, subscription or dict / set |
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126 nested -= 1 |
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127 if nested < 0: |
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128 return None |
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129 elif n == 0: |
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130 # this is the starting position of arg |
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131 return j |
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132 elif _isop(j, '(', '[', '{'): |
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133 nested += 1 |
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134 elif _isop(j, ',') and nested == 0: |
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135 n -= 1 |
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136 |
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137 return None |
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138 |
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139 def _ensureunicode(j): |
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140 """Make sure the token at j is a unicode string |
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141 |
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142 This rewrites a string token to include the unicode literal prefix |
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143 so the string transformer won't add the byte prefix. |
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144 |
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145 Ignores tokens that are not strings. Assumes bounds checking has |
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146 already been done. |
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147 |
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148 """ |
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149 st = tokens[j] |
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150 if st.type == token.STRING and st.string.startswith(("'", '"')): |
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151 tokens[j] = st._replace(string='u%s' % st.string) |
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152 |
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153 for i, t in enumerate(tokens): |
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154 # This looks like a function call. |
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155 if t.type == token.NAME and _isop(i + 1, '('): |
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156 fn = t.string |
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157 |
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158 # *attr() builtins don't accept byte strings to 2nd argument. |
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159 if fn in ( |
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160 'getattr', |
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161 'setattr', |
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162 'hasattr', |
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163 'safehasattr', |
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164 ) and not _isop(i - 1, '.'): |
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165 arg1idx = _findargnofcall(1) |
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166 if arg1idx is not None: |
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167 _ensureunicode(arg1idx) |
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168 |
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169 # It changes iteritems/values to items/values as they are not |
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170 # present in Python 3 world. |
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171 elif fn in ('iteritems', 'itervalues') and not ( |
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172 tokens[i - 1].type == token.NAME |
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173 and tokens[i - 1].string == 'def' |
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174 ): |
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175 yield t._replace(string=fn[4:]) |
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176 continue |
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177 |
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178 # Emit unmodified token. |
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179 yield t |
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180 |
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181 # Header to add to bytecode files. This MUST be changed when |
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182 # ``replacetoken`` or any mechanism that changes semantics of module |
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183 # loading is changed. Otherwise cached bytecode may get loaded without |
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184 # the new transformation mechanisms applied. |
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185 BYTECODEHEADER = b'HG\x00\x13' |
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186 |
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187 class hgloader(importlib.machinery.SourceFileLoader): |
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188 """Custom module loader that transforms source code. |
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189 |
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190 When the source code is converted to a code object, we transform |
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191 certain patterns to be Python 3 compatible. This allows us to write code |
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192 that is natively Python 2 and compatible with Python 3 without |
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193 making the code excessively ugly. |
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194 |
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195 We do this by transforming the token stream between parse and compile. |
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196 |
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197 Implementing transformations invalidates caching assumptions made |
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198 by the built-in importer. The built-in importer stores a header on |
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199 saved bytecode files indicating the Python/bytecode version. If the |
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200 version changes, the cached bytecode is ignored. The Mercurial |
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201 transformations could change at any time. This means we need to check |
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202 that cached bytecode was generated with the current transformation |
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203 code or there could be a mismatch between cached bytecode and what |
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204 would be generated from this class. |
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205 |
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206 We supplement the bytecode caching layer by wrapping ``get_data`` |
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207 and ``set_data``. These functions are called when the |
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208 ``SourceFileLoader`` retrieves and saves bytecode cache files, |
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209 respectively. We simply add an additional header on the file. As |
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210 long as the version in this file is changed when semantics change, |
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211 cached bytecode should be invalidated when transformations change. |
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212 |
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213 The added header has the form ``HG<VERSION>``. That is a literal |
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214 ``HG`` with 2 binary bytes indicating the transformation version. |
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215 """ |
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216 |
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217 def get_data(self, path): |
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218 data = super(hgloader, self).get_data(path) |
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219 |
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220 if not path.endswith(tuple(importlib.machinery.BYTECODE_SUFFIXES)): |
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221 return data |
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222 |
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223 # There should be a header indicating the Mercurial transformation |
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224 # version. If it doesn't exist or doesn't match the current version, |
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225 # we raise an OSError because that is what |
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226 # ``SourceFileLoader.get_code()`` expects when loading bytecode |
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227 # paths to indicate the cached file is "bad." |
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228 if data[0:2] != b'HG': |
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229 raise OSError('no hg header') |
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230 if data[0:4] != BYTECODEHEADER: |
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231 raise OSError('hg header version mismatch') |
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232 |
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233 return data[4:] |
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234 |
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235 def set_data(self, path, data, *args, **kwargs): |
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236 if path.endswith(tuple(importlib.machinery.BYTECODE_SUFFIXES)): |
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237 data = BYTECODEHEADER + data |
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238 |
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239 return super(hgloader, self).set_data(path, data, *args, **kwargs) |
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240 |
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241 def source_to_code(self, data, path): |
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242 """Perform token transformation before compilation.""" |
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243 buf = io.BytesIO(data) |
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244 tokens = tokenize.tokenize(buf.readline) |
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245 data = tokenize.untokenize(replacetokens(list(tokens), self.name)) |
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246 # Python's built-in importer strips frames from exceptions raised |
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247 # for this code. Unfortunately, that mechanism isn't extensible |
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248 # and our frame will be blamed for the import failure. There |
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249 # are extremely hacky ways to do frame stripping. We haven't |
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250 # implemented them because they are very ugly. |
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251 return super(hgloader, self).source_to_code(data, path) |
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252 |
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253 # We automagically register our custom importer as a side-effect of |
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254 # loading. This is necessary to ensure that any entry points are able |
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255 # to import mercurial.* modules without having to perform this |
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256 # registration themselves. |
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257 if not any(isinstance(x, hgpathentryfinder) for x in sys.meta_path): |
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258 # meta_path is used before any implicit finders and before sys.path. |
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259 sys.meta_path.insert(0, hgpathentryfinder()) |