Mercurial > hg
annotate mercurial/__init__.py @ 35449:24528dba0e64
run-tests: add substitution patterns for common '\' path output on Windows
The goal is to reduce the amount of hand tuning of new/changed tests that is
required on Windows. Since the OS prints the proper paths everywhere else, this
is limited to Windows. These are based on the check-code rules that were
dropped in 5feb782c7a95.
There are some minor tweaks, because those were trying to detect '/' paths
without a '(glob)' at the end, whereas these detect '\' paths. Also, it looks
like the 'no changes made to subrepo' one was broke, because the path to the
subrepo has been getting output but was not in the pattern. End anchors are
dropped because '(glob)' is no longer required, but '(feature !)' annotations
are a possibility.
The 'saved backup bundle' pattern dropped from run-tests.py was simply carrying
over the first capture group. The replace() method runs prior to evaluating
'\1', but it wasn't doing anything because of the 'r' prefix on '\\'.
The 'not recording move' entry is new, because I stumbled upon it searching for
some of these patterns. There are probably others.
author | Matt Harbison <matt_harbison@yahoo.com> |
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date | Tue, 12 Dec 2017 20:11:13 -0500 |
parents | 414114a7c18f |
children | 5246f940a48e |
rev | line source |
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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 demandimport = hgdemandimport |
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15 |
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16 __all__ = [] |
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17 |
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18 # Python 3 uses a custom module loader that transforms source code between |
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19 # source file reading and compilation. This is done by registering a custom |
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20 # finder that changes the spec for Mercurial modules to use a custom loader. |
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21 if sys.version_info[0] >= 3: |
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22 import importlib |
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23 import importlib.abc |
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24 import io |
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25 import token |
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26 import tokenize |
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27 |
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28 class hgpathentryfinder(importlib.abc.MetaPathFinder): |
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29 """A sys.meta_path finder that uses a custom module loader.""" |
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30 def find_spec(self, fullname, path, target=None): |
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31 # Only handle Mercurial-related modules. |
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32 if not fullname.startswith(('mercurial.', 'hgext.', 'hgext3rd.')): |
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33 return None |
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34 # third-party packages are expected to be dual-version clean |
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35 if fullname.startswith('mercurial.thirdparty'): |
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36 return None |
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37 # zstd is already dual-version clean, don't try and mangle it |
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38 if fullname.startswith('mercurial.zstd'): |
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39 return None |
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40 # pywatchman is already dual-version clean, don't try and mangle it |
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41 if fullname.startswith('hgext.fsmonitor.pywatchman'): |
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42 return None |
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43 |
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44 # Try to find the module using other registered finders. |
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45 spec = None |
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46 for finder in sys.meta_path: |
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47 if finder == self: |
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48 continue |
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49 |
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50 spec = finder.find_spec(fullname, path, target=target) |
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51 if spec: |
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52 break |
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53 |
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54 # This is a Mercurial-related module but we couldn't find it |
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55 # using the previously-registered finders. This likely means |
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56 # the module doesn't exist. |
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57 if not spec: |
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58 return None |
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59 |
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60 # TODO need to support loaders from alternate specs, like zip |
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61 # loaders. |
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62 loader = hgloader(spec.name, spec.origin) |
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63 # Can't use util.safehasattr here because that would require |
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64 # importing util, and we're in import code. |
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65 if hasattr(spec.loader, 'loader'): # hasattr-py3-only |
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66 # This is a nested loader (maybe a lazy loader?) |
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67 spec.loader.loader = loader |
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68 else: |
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69 spec.loader = loader |
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70 return spec |
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71 |
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72 def replacetokens(tokens, fullname): |
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73 """Transform a stream of tokens from raw to Python 3. |
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74 |
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75 It is called by the custom module loading machinery to rewrite |
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76 source/tokens between source decoding and compilation. |
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77 |
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78 Returns a generator of possibly rewritten tokens. |
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79 |
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80 The input token list may be mutated as part of processing. However, |
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81 its changes do not necessarily match the output token stream. |
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82 |
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83 REMEMBER TO CHANGE ``BYTECODEHEADER`` WHEN CHANGING THIS FUNCTION |
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84 OR CACHED FILES WON'T GET INVALIDATED PROPERLY. |
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85 """ |
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86 futureimpline = False |
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87 |
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88 # The following utility functions access the tokens list and i index of |
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89 # the for i, t enumerate(tokens) loop below |
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90 def _isop(j, *o): |
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91 """Assert that tokens[j] is an OP with one of the given values""" |
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92 try: |
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93 return tokens[j].type == token.OP and tokens[j].string in o |
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94 except IndexError: |
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95 return False |
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96 |
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97 def _findargnofcall(n): |
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98 """Find arg n of a call expression (start at 0) |
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99 |
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100 Returns index of the first token of that argument, or None if |
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101 there is not that many arguments. |
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102 |
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103 Assumes that token[i + 1] is '('. |
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104 |
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105 """ |
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106 nested = 0 |
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107 for j in range(i + 2, len(tokens)): |
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108 if _isop(j, ')', ']', '}'): |
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109 # end of call, tuple, subscription or dict / set |
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110 nested -= 1 |
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111 if nested < 0: |
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112 return None |
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113 elif n == 0: |
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114 # this is the starting position of arg |
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115 return j |
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116 elif _isop(j, '(', '[', '{'): |
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117 nested += 1 |
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118 elif _isop(j, ',') and nested == 0: |
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119 n -= 1 |
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120 |
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121 return None |
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122 |
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123 def _ensureunicode(j): |
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124 """Make sure the token at j is a unicode string |
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125 |
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126 This rewrites a string token to include the unicode literal prefix |
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127 so the string transformer won't add the byte prefix. |
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128 |
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129 Ignores tokens that are not strings. Assumes bounds checking has |
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130 already been done. |
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131 |
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132 """ |
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133 st = tokens[j] |
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134 if st.type == token.STRING and st.string.startswith(("'", '"')): |
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135 tokens[j] = st._replace(string='u%s' % st.string) |
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136 |
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137 for i, t in enumerate(tokens): |
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138 # Convert most string literals to byte literals. String literals |
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139 # in Python 2 are bytes. String literals in Python 3 are unicode. |
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140 # Most strings in Mercurial are bytes and unicode strings are rare. |
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141 # Rather than rewrite all string literals to use ``b''`` to indicate |
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142 # byte strings, we apply this token transformer to insert the ``b`` |
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143 # prefix nearly everywhere. |
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144 if t.type == token.STRING: |
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145 s = t.string |
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146 |
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147 # Preserve docstrings as string literals. This is inconsistent |
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148 # with regular unprefixed strings. However, the |
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149 # "from __future__" parsing (which allows a module docstring to |
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150 # exist before it) doesn't properly handle the docstring if it |
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151 # is b''' prefixed, leading to a SyntaxError. We leave all |
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152 # docstrings as unprefixed to avoid this. This means Mercurial |
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153 # components touching docstrings need to handle unicode, |
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154 # unfortunately. |
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155 if s[0:3] in ("'''", '"""'): |
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156 yield t |
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157 continue |
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158 |
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159 # If the first character isn't a quote, it is likely a string |
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160 # prefixing character (such as 'b', 'u', or 'r'. Ignore. |
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161 if s[0] not in ("'", '"'): |
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162 yield t |
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163 continue |
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164 |
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165 # String literal. Prefix to make a b'' string. |
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166 yield t._replace(string='b%s' % t.string) |
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167 continue |
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168 |
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169 # Insert compatibility imports at "from __future__ import" line. |
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170 # No '\n' should be added to preserve line numbers. |
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171 if (t.type == token.NAME and t.string == 'import' and |
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172 all(u.type == token.NAME for u in tokens[i - 2:i]) and |
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173 [u.string for u in tokens[i - 2:i]] == ['from', '__future__']): |
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174 futureimpline = True |
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175 if t.type == token.NEWLINE and futureimpline: |
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176 futureimpline = False |
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177 if fullname == 'mercurial.pycompat': |
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178 yield t |
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179 continue |
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180 r, c = t.start |
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181 l = (b'; from mercurial.pycompat import ' |
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182 b'delattr, getattr, hasattr, setattr, xrange, ' |
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183 b'open, unicode\n') |
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184 for u in tokenize.tokenize(io.BytesIO(l).readline): |
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185 if u.type in (tokenize.ENCODING, token.ENDMARKER): |
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186 continue |
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187 yield u._replace( |
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188 start=(r, c + u.start[1]), end=(r, c + u.end[1])) |
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189 continue |
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190 |
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191 # This looks like a function call. |
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192 if t.type == token.NAME and _isop(i + 1, '('): |
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193 fn = t.string |
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194 |
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195 # *attr() builtins don't accept byte strings to 2nd argument. |
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196 if (fn in ('getattr', 'setattr', 'hasattr', 'safehasattr') and |
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197 not _isop(i - 1, '.')): |
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198 arg1idx = _findargnofcall(1) |
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199 if arg1idx is not None: |
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200 _ensureunicode(arg1idx) |
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201 |
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202 # .encode() and .decode() on str/bytes/unicode don't accept |
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203 # byte strings on Python 3. |
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204 elif fn in ('encode', 'decode') and _isop(i - 1, '.'): |
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205 for argn in range(2): |
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206 argidx = _findargnofcall(argn) |
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207 if argidx is not None: |
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208 _ensureunicode(argidx) |
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209 |
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210 # It changes iteritems/values to items/values as they are not |
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211 # present in Python 3 world. |
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212 elif fn in ('iteritems', 'itervalues'): |
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213 yield t._replace(string=fn[4:]) |
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214 continue |
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215 |
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216 # Emit unmodified token. |
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217 yield t |
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218 |
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219 # Header to add to bytecode files. This MUST be changed when |
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220 # ``replacetoken`` or any mechanism that changes semantics of module |
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221 # loading is changed. Otherwise cached bytecode may get loaded without |
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222 # the new transformation mechanisms applied. |
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223 BYTECODEHEADER = b'HG\x00\x0a' |
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224 |
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225 class hgloader(importlib.machinery.SourceFileLoader): |
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226 """Custom module loader that transforms source code. |
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227 |
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228 When the source code is converted to a code object, we transform |
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229 certain patterns to be Python 3 compatible. This allows us to write code |
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230 that is natively Python 2 and compatible with Python 3 without |
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231 making the code excessively ugly. |
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232 |
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233 We do this by transforming the token stream between parse and compile. |
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234 |
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235 Implementing transformations invalidates caching assumptions made |
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236 by the built-in importer. The built-in importer stores a header on |
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237 saved bytecode files indicating the Python/bytecode version. If the |
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238 version changes, the cached bytecode is ignored. The Mercurial |
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239 transformations could change at any time. This means we need to check |
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240 that cached bytecode was generated with the current transformation |
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241 code or there could be a mismatch between cached bytecode and what |
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242 would be generated from this class. |
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243 |
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244 We supplement the bytecode caching layer by wrapping ``get_data`` |
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245 and ``set_data``. These functions are called when the |
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246 ``SourceFileLoader`` retrieves and saves bytecode cache files, |
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247 respectively. We simply add an additional header on the file. As |
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248 long as the version in this file is changed when semantics change, |
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249 cached bytecode should be invalidated when transformations change. |
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250 |
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251 The added header has the form ``HG<VERSION>``. That is a literal |
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252 ``HG`` with 2 binary bytes indicating the transformation version. |
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253 """ |
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254 def get_data(self, path): |
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255 data = super(hgloader, self).get_data(path) |
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256 |
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257 if not path.endswith(tuple(importlib.machinery.BYTECODE_SUFFIXES)): |
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258 return data |
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259 |
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260 # There should be a header indicating the Mercurial transformation |
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261 # version. If it doesn't exist or doesn't match the current version, |
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262 # we raise an OSError because that is what |
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263 # ``SourceFileLoader.get_code()`` expects when loading bytecode |
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264 # paths to indicate the cached file is "bad." |
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265 if data[0:2] != b'HG': |
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266 raise OSError('no hg header') |
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267 if data[0:4] != BYTECODEHEADER: |
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268 raise OSError('hg header version mismatch') |
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269 |
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270 return data[4:] |
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271 |
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272 def set_data(self, path, data, *args, **kwargs): |
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273 if path.endswith(tuple(importlib.machinery.BYTECODE_SUFFIXES)): |
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274 data = BYTECODEHEADER + data |
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275 |
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276 return super(hgloader, self).set_data(path, data, *args, **kwargs) |
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277 |
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278 def source_to_code(self, data, path): |
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279 """Perform token transformation before compilation.""" |
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280 buf = io.BytesIO(data) |
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281 tokens = tokenize.tokenize(buf.readline) |
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282 data = tokenize.untokenize(replacetokens(list(tokens), self.name)) |
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283 # Python's built-in importer strips frames from exceptions raised |
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284 # for this code. Unfortunately, that mechanism isn't extensible |
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285 # and our frame will be blamed for the import failure. There |
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286 # are extremely hacky ways to do frame stripping. We haven't |
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287 # implemented them because they are very ugly. |
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288 return super(hgloader, self).source_to_code(data, path) |
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289 |
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290 # We automagically register our custom importer as a side-effect of |
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291 # loading. This is necessary to ensure that any entry points are able |
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292 # to import mercurial.* modules without having to perform this |
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293 # registration themselves. |
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294 if not any(isinstance(x, hgpathentryfinder) for x in sys.meta_path): |
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295 # meta_path is used before any implicit finders and before sys.path. |
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296 sys.meta_path.insert(0, hgpathentryfinder()) |