annotate mercurial/__init__.py @ 34033:d37f1bb68169

filemerge: move a util copy call to filectx.write This way a future in-memory-merge context can intercept them. Differential Revision: https://phab.mercurial-scm.org/D400
author Phil Cohen <phillco@fb.com>
date Thu, 31 Aug 2017 11:28:59 -0700
parents 5d0c0c8d2929
children 9fb9f8440b71
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 # selectors2 is already dual-version clean, don't try and mangle it
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35 if fullname.startswith('mercurial.selectors2'):
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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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diff changeset
143 # prefix nearly everywhere.
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diff changeset
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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diff changeset
153 # components touching docstrings need to handle unicode,
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diff changeset
154 # unfortunately.
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diff changeset
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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diff changeset
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')
29800
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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]))
29800
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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)
423377290a3a py3: refactor token parsing to handle call args properly
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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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diff changeset
205 for argn in range(2):
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206 argidx = _findargnofcall(argn)
423377290a3a py3: refactor token parsing to handle call args properly
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diff changeset
207 if argidx is not None:
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208 _ensureunicode(argidx)
29550
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diff changeset
209
31445
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diff changeset
210 # It changes iteritems/values to items/values as they are not
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diff changeset
211 # present in Python 3 world.
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212 elif fn in ('iteritems', 'itervalues'):
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diff changeset
213 yield t._replace(string=fn[4:])
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parents: 30051
diff changeset
214 continue
eaaedad68011 py3: switch to .items() using transformer
Pulkit Goyal <7895pulkit@gmail.com>
parents: 30051
diff changeset
215
29550
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diff changeset
216 # Emit unmodified token.
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
217 yield t
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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parents: 29490
diff changeset
218
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
219 # Header to add to bytecode files. This MUST be changed when
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
220 # ``replacetoken`` or any mechanism that changes semantics of module
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
221 # loading is changed. Otherwise cached bytecode may get loaded without
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
222 # the new transformation mechanisms applied.
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parents: 31445
diff changeset
223 BYTECODEHEADER = b'HG\x00\x0a'
29550
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diff changeset
224
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
225 class hgloader(importlib.machinery.SourceFileLoader):
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226 """Custom module loader that transforms source code.
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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parents: 29490
diff changeset
227
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
228 When the source code is converted to a code object, we transform
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diff changeset
229 certain patterns to be Python 3 compatible. This allows us to write code
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
230 that is natively Python 2 and compatible with Python 3 without
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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parents: 29490
diff changeset
231 making the code excessively ugly.
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
232
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
233 We do this by transforming the token stream between parse and compile.
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
234
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
235 Implementing transformations invalidates caching assumptions made
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
236 by the built-in importer. The built-in importer stores a header on
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
237 saved bytecode files indicating the Python/bytecode version. If the
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
238 version changes, the cached bytecode is ignored. The Mercurial
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
239 transformations could change at any time. This means we need to check
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
240 that cached bytecode was generated with the current transformation
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
241 code or there could be a mismatch between cached bytecode and what
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
242 would be generated from this class.
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
parents: 29490
diff changeset
243
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
244 We supplement the bytecode caching layer by wrapping ``get_data``
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
245 and ``set_data``. These functions are called when the
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
246 ``SourceFileLoader`` retrieves and saves bytecode cache files,
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
247 respectively. We simply add an additional header on the file. As
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
248 long as the version in this file is changed when semantics change,
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diff changeset
249 cached bytecode should be invalidated when transformations change.
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
250
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
251 The added header has the form ``HG<VERSION>``. That is a literal
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
252 ``HG`` with 2 binary bytes indicating the transformation version.
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
253 """
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
254 def get_data(self, path):
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
255 data = super(hgloader, self).get_data(path)
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diff changeset
256
1c22400db72d mercurial: implement a source transforming module loader on Python 3
Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
257 if not path.endswith(tuple(importlib.machinery.BYTECODE_SUFFIXES)):
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diff changeset
258 return data
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
259
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
260 # There should be a header indicating the Mercurial transformation
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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parents: 29490
diff changeset
261 # version. If it doesn't exist or doesn't match the current version,
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diff changeset
262 # we raise an OSError because that is what
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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diff changeset
263 # ``SourceFileLoader.get_code()`` expects when loading bytecode
1c22400db72d mercurial: implement a source transforming module loader on Python 3
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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))
29550
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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
32373
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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())