rust: switch hg-core and hg-cpython to rust 2018 edition
Many interesting changes have happened in Rust since the Oxidation Plan was
introduced, like the 2018 edition and procedural macros:
- Opting in to the 2018 edition is a clear benefit in terms of future
proofing, new (nice to have) syntactical sugar notwithstanding. It
also has a new non-lexical, non-AST based borrow checker that has
fewer bugs(!) and allows us to write correct code that in some cases
would have been rejected by the old one.
- Procedural macros allow us to use the PyO3 crate which maintainers have
expressed the clear goal of compiling on stable, which would help in
code maintainability compared to rust-cpython.
In this patch are the following changes:
- Removing most `extern crate` uses
- Updating `use` clauses (`crate` keyword, nested `use`)
- Removing `mod.rs` in favor of an aptly named module file
Like discussed in the mailing list (
https://www.mercurial-scm.org/pipermail/mercurial-devel/2019-July/132316.html
), until Rust integration in Mercurial is considered to be out of the
experimental phase, the maximum version of Rust allowed is whatever the latest
version Debian packages.
Differential Revision: https://phab.mercurial-scm.org/D6597
# fileset.py - file set queries for mercurial
#
# Copyright 2010 Matt Mackall <mpm@selenic.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
from __future__ import absolute_import
import errno
import re
from .i18n import _
from . import (
error,
filesetlang,
match as matchmod,
merge,
pycompat,
registrar,
scmutil,
util,
)
from .utils import (
stringutil,
)
# common weight constants
_WEIGHT_CHECK_FILENAME = filesetlang.WEIGHT_CHECK_FILENAME
_WEIGHT_READ_CONTENTS = filesetlang.WEIGHT_READ_CONTENTS
_WEIGHT_STATUS = filesetlang.WEIGHT_STATUS
_WEIGHT_STATUS_THOROUGH = filesetlang.WEIGHT_STATUS_THOROUGH
# helpers for processing parsed tree
getsymbol = filesetlang.getsymbol
getstring = filesetlang.getstring
_getkindpat = filesetlang.getkindpat
getpattern = filesetlang.getpattern
getargs = filesetlang.getargs
def getmatch(mctx, x):
if not x:
raise error.ParseError(_("missing argument"))
return methods[x[0]](mctx, *x[1:])
def getmatchwithstatus(mctx, x, hint):
keys = set(getstring(hint, 'status hint must be a string').split())
return getmatch(mctx.withstatus(keys), x)
def stringmatch(mctx, x):
return mctx.matcher([x])
def kindpatmatch(mctx, x, y):
return stringmatch(mctx, _getkindpat(x, y, matchmod.allpatternkinds,
_("pattern must be a string")))
def patternsmatch(mctx, *xs):
allkinds = matchmod.allpatternkinds
patterns = [getpattern(x, allkinds, _("pattern must be a string"))
for x in xs]
return mctx.matcher(patterns)
def andmatch(mctx, x, y):
xm = getmatch(mctx, x)
ym = getmatch(mctx.narrowed(xm), y)
return matchmod.intersectmatchers(xm, ym)
def ormatch(mctx, *xs):
ms = [getmatch(mctx, x) for x in xs]
return matchmod.unionmatcher(ms)
def notmatch(mctx, x):
m = getmatch(mctx, x)
return mctx.predicate(lambda f: not m(f), predrepr=('<not %r>', m))
def minusmatch(mctx, x, y):
xm = getmatch(mctx, x)
ym = getmatch(mctx.narrowed(xm), y)
return matchmod.differencematcher(xm, ym)
def listmatch(mctx, *xs):
raise error.ParseError(_("can't use a list in this context"),
hint=_('see \'hg help "filesets.x or y"\''))
def func(mctx, a, b):
funcname = getsymbol(a)
if funcname in symbols:
return symbols[funcname](mctx, b)
keep = lambda fn: getattr(fn, '__doc__', None) is not None
syms = [s for (s, fn) in symbols.items() if keep(fn)]
raise error.UnknownIdentifier(funcname, syms)
# symbols are callable like:
# fun(mctx, x)
# with:
# mctx - current matchctx instance
# x - argument in tree form
symbols = filesetlang.symbols
predicate = registrar.filesetpredicate(symbols)
@predicate('modified()', callstatus=True, weight=_WEIGHT_STATUS)
def modified(mctx, x):
"""File that is modified according to :hg:`status`.
"""
# i18n: "modified" is a keyword
getargs(x, 0, 0, _("modified takes no arguments"))
s = set(mctx.status().modified)
return mctx.predicate(s.__contains__, predrepr='modified')
@predicate('added()', callstatus=True, weight=_WEIGHT_STATUS)
def added(mctx, x):
"""File that is added according to :hg:`status`.
"""
# i18n: "added" is a keyword
getargs(x, 0, 0, _("added takes no arguments"))
s = set(mctx.status().added)
return mctx.predicate(s.__contains__, predrepr='added')
@predicate('removed()', callstatus=True, weight=_WEIGHT_STATUS)
def removed(mctx, x):
"""File that is removed according to :hg:`status`.
"""
# i18n: "removed" is a keyword
getargs(x, 0, 0, _("removed takes no arguments"))
s = set(mctx.status().removed)
return mctx.predicate(s.__contains__, predrepr='removed')
@predicate('deleted()', callstatus=True, weight=_WEIGHT_STATUS)
def deleted(mctx, x):
"""Alias for ``missing()``.
"""
# i18n: "deleted" is a keyword
getargs(x, 0, 0, _("deleted takes no arguments"))
s = set(mctx.status().deleted)
return mctx.predicate(s.__contains__, predrepr='deleted')
@predicate('missing()', callstatus=True, weight=_WEIGHT_STATUS)
def missing(mctx, x):
"""File that is missing according to :hg:`status`.
"""
# i18n: "missing" is a keyword
getargs(x, 0, 0, _("missing takes no arguments"))
s = set(mctx.status().deleted)
return mctx.predicate(s.__contains__, predrepr='deleted')
@predicate('unknown()', callstatus=True, weight=_WEIGHT_STATUS_THOROUGH)
def unknown(mctx, x):
"""File that is unknown according to :hg:`status`."""
# i18n: "unknown" is a keyword
getargs(x, 0, 0, _("unknown takes no arguments"))
s = set(mctx.status().unknown)
return mctx.predicate(s.__contains__, predrepr='unknown')
@predicate('ignored()', callstatus=True, weight=_WEIGHT_STATUS_THOROUGH)
def ignored(mctx, x):
"""File that is ignored according to :hg:`status`."""
# i18n: "ignored" is a keyword
getargs(x, 0, 0, _("ignored takes no arguments"))
s = set(mctx.status().ignored)
return mctx.predicate(s.__contains__, predrepr='ignored')
@predicate('clean()', callstatus=True, weight=_WEIGHT_STATUS)
def clean(mctx, x):
"""File that is clean according to :hg:`status`.
"""
# i18n: "clean" is a keyword
getargs(x, 0, 0, _("clean takes no arguments"))
s = set(mctx.status().clean)
return mctx.predicate(s.__contains__, predrepr='clean')
@predicate('tracked()')
def tracked(mctx, x):
"""File that is under Mercurial control."""
# i18n: "tracked" is a keyword
getargs(x, 0, 0, _("tracked takes no arguments"))
return mctx.predicate(mctx.ctx.__contains__, predrepr='tracked')
@predicate('binary()', weight=_WEIGHT_READ_CONTENTS)
def binary(mctx, x):
"""File that appears to be binary (contains NUL bytes).
"""
# i18n: "binary" is a keyword
getargs(x, 0, 0, _("binary takes no arguments"))
return mctx.fpredicate(lambda fctx: fctx.isbinary(),
predrepr='binary', cache=True)
@predicate('exec()')
def exec_(mctx, x):
"""File that is marked as executable.
"""
# i18n: "exec" is a keyword
getargs(x, 0, 0, _("exec takes no arguments"))
ctx = mctx.ctx
return mctx.predicate(lambda f: ctx.flags(f) == 'x', predrepr='exec')
@predicate('symlink()')
def symlink(mctx, x):
"""File that is marked as a symlink.
"""
# i18n: "symlink" is a keyword
getargs(x, 0, 0, _("symlink takes no arguments"))
ctx = mctx.ctx
return mctx.predicate(lambda f: ctx.flags(f) == 'l', predrepr='symlink')
@predicate('resolved()', weight=_WEIGHT_STATUS)
def resolved(mctx, x):
"""File that is marked resolved according to :hg:`resolve -l`.
"""
# i18n: "resolved" is a keyword
getargs(x, 0, 0, _("resolved takes no arguments"))
if mctx.ctx.rev() is not None:
return mctx.never()
ms = merge.mergestate.read(mctx.ctx.repo())
return mctx.predicate(lambda f: f in ms and ms[f] == 'r',
predrepr='resolved')
@predicate('unresolved()', weight=_WEIGHT_STATUS)
def unresolved(mctx, x):
"""File that is marked unresolved according to :hg:`resolve -l`.
"""
# i18n: "unresolved" is a keyword
getargs(x, 0, 0, _("unresolved takes no arguments"))
if mctx.ctx.rev() is not None:
return mctx.never()
ms = merge.mergestate.read(mctx.ctx.repo())
return mctx.predicate(lambda f: f in ms and ms[f] == 'u',
predrepr='unresolved')
@predicate('hgignore()', weight=_WEIGHT_STATUS)
def hgignore(mctx, x):
"""File that matches the active .hgignore pattern.
"""
# i18n: "hgignore" is a keyword
getargs(x, 0, 0, _("hgignore takes no arguments"))
return mctx.ctx.repo().dirstate._ignore
@predicate('portable()', weight=_WEIGHT_CHECK_FILENAME)
def portable(mctx, x):
"""File that has a portable name. (This doesn't include filenames with case
collisions.)
"""
# i18n: "portable" is a keyword
getargs(x, 0, 0, _("portable takes no arguments"))
return mctx.predicate(lambda f: util.checkwinfilename(f) is None,
predrepr='portable')
@predicate('grep(regex)', weight=_WEIGHT_READ_CONTENTS)
def grep(mctx, x):
"""File contains the given regular expression.
"""
try:
# i18n: "grep" is a keyword
r = re.compile(getstring(x, _("grep requires a pattern")))
except re.error as e:
raise error.ParseError(_('invalid match pattern: %s') %
stringutil.forcebytestr(e))
return mctx.fpredicate(lambda fctx: r.search(fctx.data()),
predrepr=('grep(%r)', r.pattern), cache=True)
def _sizetomax(s):
try:
s = s.strip().lower()
for k, v in util._sizeunits:
if s.endswith(k):
# max(4k) = 5k - 1, max(4.5k) = 4.6k - 1
n = s[:-len(k)]
inc = 1.0
if "." in n:
inc /= 10 ** len(n.split(".")[1])
return int((float(n) + inc) * v) - 1
# no extension, this is a precise value
return int(s)
except ValueError:
raise error.ParseError(_("couldn't parse size: %s") % s)
def sizematcher(expr):
"""Return a function(size) -> bool from the ``size()`` expression"""
expr = expr.strip()
if '-' in expr: # do we have a range?
a, b = expr.split('-', 1)
a = util.sizetoint(a)
b = util.sizetoint(b)
return lambda x: x >= a and x <= b
elif expr.startswith("<="):
a = util.sizetoint(expr[2:])
return lambda x: x <= a
elif expr.startswith("<"):
a = util.sizetoint(expr[1:])
return lambda x: x < a
elif expr.startswith(">="):
a = util.sizetoint(expr[2:])
return lambda x: x >= a
elif expr.startswith(">"):
a = util.sizetoint(expr[1:])
return lambda x: x > a
else:
a = util.sizetoint(expr)
b = _sizetomax(expr)
return lambda x: x >= a and x <= b
@predicate('size(expression)', weight=_WEIGHT_STATUS)
def size(mctx, x):
"""File size matches the given expression. Examples:
- size('1k') - files from 1024 to 2047 bytes
- size('< 20k') - files less than 20480 bytes
- size('>= .5MB') - files at least 524288 bytes
- size('4k - 1MB') - files from 4096 bytes to 1048576 bytes
"""
# i18n: "size" is a keyword
expr = getstring(x, _("size requires an expression"))
m = sizematcher(expr)
return mctx.fpredicate(lambda fctx: m(fctx.size()),
predrepr=('size(%r)', expr), cache=True)
@predicate('encoding(name)', weight=_WEIGHT_READ_CONTENTS)
def encoding(mctx, x):
"""File can be successfully decoded with the given character
encoding. May not be useful for encodings other than ASCII and
UTF-8.
"""
# i18n: "encoding" is a keyword
enc = getstring(x, _("encoding requires an encoding name"))
def encp(fctx):
d = fctx.data()
try:
d.decode(pycompat.sysstr(enc))
return True
except LookupError:
raise error.Abort(_("unknown encoding '%s'") % enc)
except UnicodeDecodeError:
return False
return mctx.fpredicate(encp, predrepr=('encoding(%r)', enc), cache=True)
@predicate('eol(style)', weight=_WEIGHT_READ_CONTENTS)
def eol(mctx, x):
"""File contains newlines of the given style (dos, unix, mac). Binary
files are excluded, files with mixed line endings match multiple
styles.
"""
# i18n: "eol" is a keyword
enc = getstring(x, _("eol requires a style name"))
def eolp(fctx):
if fctx.isbinary():
return False
d = fctx.data()
if (enc == 'dos' or enc == 'win') and '\r\n' in d:
return True
elif enc == 'unix' and re.search('(?<!\r)\n', d):
return True
elif enc == 'mac' and re.search('\r(?!\n)', d):
return True
return False
return mctx.fpredicate(eolp, predrepr=('eol(%r)', enc), cache=True)
@predicate('copied()')
def copied(mctx, x):
"""File that is recorded as being copied.
"""
# i18n: "copied" is a keyword
getargs(x, 0, 0, _("copied takes no arguments"))
def copiedp(fctx):
p = fctx.parents()
return p and p[0].path() != fctx.path()
return mctx.fpredicate(copiedp, predrepr='copied', cache=True)
@predicate('revs(revs, pattern)', weight=_WEIGHT_STATUS)
def revs(mctx, x):
"""Evaluate set in the specified revisions. If the revset match multiple
revs, this will return file matching pattern in any of the revision.
"""
# i18n: "revs" is a keyword
r, x = getargs(x, 2, 2, _("revs takes two arguments"))
# i18n: "revs" is a keyword
revspec = getstring(r, _("first argument to revs must be a revision"))
repo = mctx.ctx.repo()
revs = scmutil.revrange(repo, [revspec])
matchers = []
for r in revs:
ctx = repo[r]
mc = mctx.switch(ctx.p1(), ctx)
matchers.append(getmatch(mc, x))
if not matchers:
return mctx.never()
if len(matchers) == 1:
return matchers[0]
return matchmod.unionmatcher(matchers)
@predicate('status(base, rev, pattern)', weight=_WEIGHT_STATUS)
def status(mctx, x):
"""Evaluate predicate using status change between ``base`` and
``rev``. Examples:
- ``status(3, 7, added())`` - matches files added from "3" to "7"
"""
repo = mctx.ctx.repo()
# i18n: "status" is a keyword
b, r, x = getargs(x, 3, 3, _("status takes three arguments"))
# i18n: "status" is a keyword
baseerr = _("first argument to status must be a revision")
baserevspec = getstring(b, baseerr)
if not baserevspec:
raise error.ParseError(baseerr)
reverr = _("second argument to status must be a revision")
revspec = getstring(r, reverr)
if not revspec:
raise error.ParseError(reverr)
basectx, ctx = scmutil.revpair(repo, [baserevspec, revspec])
mc = mctx.switch(basectx, ctx)
return getmatch(mc, x)
@predicate('subrepo([pattern])')
def subrepo(mctx, x):
"""Subrepositories whose paths match the given pattern.
"""
# i18n: "subrepo" is a keyword
getargs(x, 0, 1, _("subrepo takes at most one argument"))
ctx = mctx.ctx
sstate = ctx.substate
if x:
pat = getpattern(x, matchmod.allpatternkinds,
# i18n: "subrepo" is a keyword
_("subrepo requires a pattern or no arguments"))
fast = not matchmod.patkind(pat)
if fast:
def m(s):
return (s == pat)
else:
m = matchmod.match(ctx.repo().root, '', [pat], ctx=ctx)
return mctx.predicate(lambda f: f in sstate and m(f),
predrepr=('subrepo(%r)', pat))
else:
return mctx.predicate(sstate.__contains__, predrepr='subrepo')
methods = {
'withstatus': getmatchwithstatus,
'string': stringmatch,
'symbol': stringmatch,
'kindpat': kindpatmatch,
'patterns': patternsmatch,
'and': andmatch,
'or': ormatch,
'minus': minusmatch,
'list': listmatch,
'not': notmatch,
'func': func,
}
class matchctx(object):
def __init__(self, basectx, ctx, badfn=None):
self._basectx = basectx
self.ctx = ctx
self._badfn = badfn
self._match = None
self._status = None
def narrowed(self, match):
"""Create matchctx for a sub-tree narrowed by the given matcher"""
mctx = matchctx(self._basectx, self.ctx, self._badfn)
mctx._match = match
# leave wider status which we don't have to care
mctx._status = self._status
return mctx
def switch(self, basectx, ctx):
mctx = matchctx(basectx, ctx, self._badfn)
mctx._match = self._match
return mctx
def withstatus(self, keys):
"""Create matchctx which has precomputed status specified by the keys"""
mctx = matchctx(self._basectx, self.ctx, self._badfn)
mctx._match = self._match
mctx._buildstatus(keys)
return mctx
def _buildstatus(self, keys):
self._status = self._basectx.status(self.ctx, self._match,
listignored='ignored' in keys,
listclean='clean' in keys,
listunknown='unknown' in keys)
def status(self):
return self._status
def matcher(self, patterns):
return self.ctx.match(patterns, badfn=self._badfn)
def predicate(self, predfn, predrepr=None, cache=False):
"""Create a matcher to select files by predfn(filename)"""
if cache:
predfn = util.cachefunc(predfn)
return matchmod.predicatematcher(predfn, predrepr=predrepr,
badfn=self._badfn)
def fpredicate(self, predfn, predrepr=None, cache=False):
"""Create a matcher to select files by predfn(fctx) at the current
revision
Missing files are ignored.
"""
ctx = self.ctx
if ctx.rev() is None:
def fctxpredfn(f):
try:
fctx = ctx[f]
except error.LookupError:
return False
try:
fctx.audit()
except error.Abort:
return False
try:
return predfn(fctx)
except (IOError, OSError) as e:
# open()-ing a directory fails with EACCES on Windows
if e.errno in (errno.ENOENT, errno.EACCES, errno.ENOTDIR,
errno.EISDIR):
return False
raise
else:
def fctxpredfn(f):
try:
fctx = ctx[f]
except error.LookupError:
return False
return predfn(fctx)
return self.predicate(fctxpredfn, predrepr=predrepr, cache=cache)
def never(self):
"""Create a matcher to select nothing"""
return matchmod.never(badfn=self._badfn)
def match(ctx, expr, badfn=None):
"""Create a matcher for a single fileset expression"""
tree = filesetlang.parse(expr)
tree = filesetlang.analyze(tree)
tree = filesetlang.optimize(tree)
mctx = matchctx(ctx.p1(), ctx, badfn=badfn)
return getmatch(mctx, tree)
def loadpredicate(ui, extname, registrarobj):
"""Load fileset predicates from specified registrarobj
"""
for name, func in registrarobj._table.iteritems():
symbols[name] = func
# tell hggettext to extract docstrings from these functions:
i18nfunctions = symbols.values()