mercurial/__init__.py
author Gregory Szorc <gregory.szorc@gmail.com>
Sat, 14 Apr 2018 20:04:59 -0700
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parent 36617 5246f940a48e
child 38785 fb9121ea38c4
permissions -rw-r--r--
commands: use command executor interface Differential Revision: https://phab.mercurial-scm.org/D3391
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# __init__.py - Startup and module loading logic for Mercurial.
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#
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# Copyright 2015 Gregory Szorc <gregory.szorc@gmail.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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import sys
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# Allow 'from mercurial import demandimport' to keep working.
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import hgdemandimport
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demandimport = hgdemandimport
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__all__ = []
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# Python 3 uses a custom module loader that transforms source code between
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# source file reading and compilation. This is done by registering a custom
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# finder that changes the spec for Mercurial modules to use a custom loader.
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if sys.version_info[0] >= 3:
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    import importlib
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    import importlib.abc
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    import io
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    import token
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    import tokenize
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    class hgpathentryfinder(importlib.abc.MetaPathFinder):
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        """A sys.meta_path finder that uses a custom module loader."""
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        def find_spec(self, fullname, path, target=None):
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            # Only handle Mercurial-related modules.
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            if not fullname.startswith(('mercurial.', 'hgext.', 'hgext3rd.')):
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                return None
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            # don't try to parse binary
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            if fullname.startswith('mercurial.cext.'):
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                return None
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            # third-party packages are expected to be dual-version clean
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            if fullname.startswith('mercurial.thirdparty'):
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                return None
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            # zstd is already dual-version clean, don't try and mangle it
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            if fullname.startswith('mercurial.zstd'):
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                return None
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            # pywatchman is already dual-version clean, don't try and mangle it
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            if fullname.startswith('hgext.fsmonitor.pywatchman'):
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                return None
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            # Try to find the module using other registered finders.
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            spec = None
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            for finder in sys.meta_path:
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                if finder == self:
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                    continue
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                spec = finder.find_spec(fullname, path, target=target)
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                if spec:
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                    break
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            # This is a Mercurial-related module but we couldn't find it
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            # using the previously-registered finders. This likely means
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            # the module doesn't exist.
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            if not spec:
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                return None
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            # TODO need to support loaders from alternate specs, like zip
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            # loaders.
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            loader = hgloader(spec.name, spec.origin)
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            # Can't use util.safehasattr here because that would require
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            # importing util, and we're in import code.
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            if hasattr(spec.loader, 'loader'): # hasattr-py3-only
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                # This is a nested loader (maybe a lazy loader?)
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                spec.loader.loader = loader
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            else:
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                spec.loader = loader
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            return spec
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    def replacetokens(tokens, fullname):
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        """Transform a stream of tokens from raw to Python 3.
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        It is called by the custom module loading machinery to rewrite
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        source/tokens between source decoding and compilation.
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        Returns a generator of possibly rewritten tokens.
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        The input token list may be mutated as part of processing. However,
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        its changes do not necessarily match the output token stream.
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        REMEMBER TO CHANGE ``BYTECODEHEADER`` WHEN CHANGING THIS FUNCTION
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        OR CACHED FILES WON'T GET INVALIDATED PROPERLY.
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        """
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        futureimpline = False
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        # The following utility functions access the tokens list and i index of
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        # the for i, t enumerate(tokens) loop below
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        def _isop(j, *o):
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            """Assert that tokens[j] is an OP with one of the given values"""
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            try:
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                return tokens[j].type == token.OP and tokens[j].string in o
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            except IndexError:
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                return False
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        def _findargnofcall(n):
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            """Find arg n of a call expression (start at 0)
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            Returns index of the first token of that argument, or None if
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            there is not that many arguments.
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            Assumes that token[i + 1] is '('.
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            """
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            nested = 0
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            for j in range(i + 2, len(tokens)):
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                if _isop(j, ')', ']', '}'):
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                    # end of call, tuple, subscription or dict / set
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                    nested -= 1
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                    if nested < 0:
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                        return None
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                elif n == 0:
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                    # this is the starting position of arg
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                    return j
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                elif _isop(j, '(', '[', '{'):
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                    nested += 1
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                elif _isop(j, ',') and nested == 0:
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                    n -= 1
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            return None
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        def _ensureunicode(j):
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            """Make sure the token at j is a unicode string
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            This rewrites a string token to include the unicode literal prefix
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            so the string transformer won't add the byte prefix.
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            Ignores tokens that are not strings. Assumes bounds checking has
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            already been done.
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            """
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            st = tokens[j]
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            if st.type == token.STRING and st.string.startswith(("'", '"')):
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                tokens[j] = st._replace(string='u%s' % st.string)
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        for i, t in enumerate(tokens):
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            # Convert most string literals to byte literals. String literals
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            # in Python 2 are bytes. String literals in Python 3 are unicode.
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            # Most strings in Mercurial are bytes and unicode strings are rare.
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            # Rather than rewrite all string literals to use ``b''`` to indicate
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            # byte strings, we apply this token transformer to insert the ``b``
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            # prefix nearly everywhere.
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            if t.type == token.STRING:
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                s = t.string
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                # Preserve docstrings as string literals. This is inconsistent
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                # with regular unprefixed strings. However, the
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                # "from __future__" parsing (which allows a module docstring to
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                # exist before it) doesn't properly handle the docstring if it
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                # is b''' prefixed, leading to a SyntaxError. We leave all
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                # docstrings as unprefixed to avoid this. This means Mercurial
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                # components touching docstrings need to handle unicode,
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                # unfortunately.
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                if s[0:3] in ("'''", '"""'):
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                    yield t
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                    continue
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                # If the first character isn't a quote, it is likely a string
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                # prefixing character (such as 'b', 'u', or 'r'. Ignore.
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                if s[0] not in ("'", '"'):
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                    yield t
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                    continue
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                # String literal. Prefix to make a b'' string.
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                yield t._replace(string='b%s' % t.string)
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                continue
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            # Insert compatibility imports at "from __future__ import" line.
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            # No '\n' should be added to preserve line numbers.
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            if (t.type == token.NAME and t.string == 'import' and
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                all(u.type == token.NAME for u in tokens[i - 2:i]) and
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                [u.string for u in tokens[i - 2:i]] == ['from', '__future__']):
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                futureimpline = True
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            if t.type == token.NEWLINE and futureimpline:
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                futureimpline = False
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                if fullname == 'mercurial.pycompat':
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                    yield t
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                    continue
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                r, c = t.start
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                l = (b'; from mercurial.pycompat import '
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                     b'delattr, getattr, hasattr, setattr, xrange, '
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                     b'open, unicode\n')
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                for u in tokenize.tokenize(io.BytesIO(l).readline):
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                    if u.type in (tokenize.ENCODING, token.ENDMARKER):
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                        continue
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                    yield u._replace(
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                        start=(r, c + u.start[1]), end=(r, c + u.end[1]))
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                continue
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   193
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            # This looks like a function call.
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            if t.type == token.NAME and _isop(i + 1, '('):
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                fn = t.string
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   197
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                # *attr() builtins don't accept byte strings to 2nd argument.
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                if (fn in ('getattr', 'setattr', 'hasattr', 'safehasattr') and
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                        not _isop(i - 1, '.')):
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                    arg1idx = _findargnofcall(1)
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                    if arg1idx is not None:
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                        _ensureunicode(arg1idx)
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                # .encode() and .decode() on str/bytes/unicode don't accept
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                # byte strings on Python 3.
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                elif fn in ('encode', 'decode') and _isop(i - 1, '.'):
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                    for argn in range(2):
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                        argidx = _findargnofcall(argn)
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                        if argidx is not None:
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                            _ensureunicode(argidx)
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   212
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                # It changes iteritems/values to items/values as they are not
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                # present in Python 3 world.
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                elif fn in ('iteritems', 'itervalues'):
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                    yield t._replace(string=fn[4:])
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                    continue
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            # Emit unmodified token.
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            yield t
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   221
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    # Header to add to bytecode files. This MUST be changed when
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   223
    # ``replacetoken`` or any mechanism that changes semantics of module
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   224
    # loading is changed. Otherwise cached bytecode may get loaded without
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    # the new transformation mechanisms applied.
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    BYTECODEHEADER = b'HG\x00\x0a'
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    class hgloader(importlib.machinery.SourceFileLoader):
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        """Custom module loader that transforms source code.
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   230
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   231
        When the source code is converted to a code object, we transform
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        certain patterns to be Python 3 compatible. This allows us to write code
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        that is natively Python 2 and compatible with Python 3 without
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        making the code excessively ugly.
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        We do this by transforming the token stream between parse and compile.
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   237
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        Implementing transformations invalidates caching assumptions made
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        by the built-in importer. The built-in importer stores a header on
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        saved bytecode files indicating the Python/bytecode version. If the
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        version changes, the cached bytecode is ignored. The Mercurial
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   242
        transformations could change at any time. This means we need to check
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        that cached bytecode was generated with the current transformation
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        code or there could be a mismatch between cached bytecode and what
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        would be generated from this class.
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   246
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        We supplement the bytecode caching layer by wrapping ``get_data``
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        and ``set_data``. These functions are called when the
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        ``SourceFileLoader`` retrieves and saves bytecode cache files,
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        respectively. We simply add an additional header on the file. As
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        long as the version in this file is changed when semantics change,
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        cached bytecode should be invalidated when transformations change.
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        The added header has the form ``HG<VERSION>``. That is a literal
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        ``HG`` with 2 binary bytes indicating the transformation version.
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        """
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        def get_data(self, path):
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            data = super(hgloader, self).get_data(path)
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            if not path.endswith(tuple(importlib.machinery.BYTECODE_SUFFIXES)):
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                return data
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            # There should be a header indicating the Mercurial transformation
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            # version. If it doesn't exist or doesn't match the current version,
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            # we raise an OSError because that is what
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            # ``SourceFileLoader.get_code()`` expects when loading bytecode
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            # paths to indicate the cached file is "bad."
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            if data[0:2] != b'HG':
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                raise OSError('no hg header')
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            if data[0:4] != BYTECODEHEADER:
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                raise OSError('hg header version mismatch')
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            return data[4:]
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        def set_data(self, path, data, *args, **kwargs):
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            if path.endswith(tuple(importlib.machinery.BYTECODE_SUFFIXES)):
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                data = BYTECODEHEADER + data
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            return super(hgloader, self).set_data(path, data, *args, **kwargs)
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        def source_to_code(self, data, path):
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            """Perform token transformation before compilation."""
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            buf = io.BytesIO(data)
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            tokens = tokenize.tokenize(buf.readline)
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            data = tokenize.untokenize(replacetokens(list(tokens), self.name))
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            # Python's built-in importer strips frames from exceptions raised
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            # for this code. Unfortunately, that mechanism isn't extensible
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            # and our frame will be blamed for the import failure. There
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            # are extremely hacky ways to do frame stripping. We haven't
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            # implemented them because they are very ugly.
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            return super(hgloader, self).source_to_code(data, path)
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    # We automagically register our custom importer as a side-effect of
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    # loading. This is necessary to ensure that any entry points are able
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    # to import mercurial.* modules without having to perform this
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    # registration themselves.
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    if not any(isinstance(x, hgpathentryfinder) for x in sys.meta_path):
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        # meta_path is used before any implicit finders and before sys.path.
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        sys.meta_path.insert(0, hgpathentryfinder())