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# grep.py - logic for history walk and grep
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#
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# Copyright 2005-2007 Olivia Mackall <olivia@selenic.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 annotations
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import difflib
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from .i18n import _
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from . import (
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error,
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match as matchmod,
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pycompat,
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scmutil,
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util,
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)
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def matchlines(body, regexp):
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begin = 0
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linenum = 0
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while begin < len(body):
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match = regexp.search(body, begin)
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if not match:
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break
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mstart, mend = match.span()
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linenum += body.count(b'\n', begin, mstart) + 1
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lstart = body.rfind(b'\n', begin, mstart) + 1 or begin
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begin = body.find(b'\n', mend) + 1 or len(body) + 1
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lend = begin - 1
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yield linenum, mstart - lstart, mend - lstart, body[lstart:lend]
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class linestate:
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def __init__(self, line, linenum, colstart, colend):
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self.line = line
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self.linenum = linenum
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self.colstart = colstart
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self.colend = colend
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def __hash__(self):
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return hash(self.line)
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def __eq__(self, other):
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return self.line == other.line
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def findpos(self, regexp):
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"""Iterate all (start, end) indices of matches"""
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yield self.colstart, self.colend
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p = self.colend
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while p < len(self.line):
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m = regexp.search(self.line, p)
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if not m:
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break
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if m.end() == p:
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p += 1
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else:
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yield m.span()
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p = m.end()
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def difflinestates(a, b):
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sm = difflib.SequenceMatcher(None, a, b)
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for tag, alo, ahi, blo, bhi in sm.get_opcodes():
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if tag == 'insert':
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for i in range(blo, bhi):
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yield (b'+', b[i])
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elif tag == 'delete':
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for i in range(alo, ahi):
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yield (b'-', a[i])
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elif tag == 'replace':
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for i in range(alo, ahi):
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yield (b'-', a[i])
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for i in range(blo, bhi):
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yield (b'+', b[i])
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class grepsearcher:
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"""Search files and revisions for lines matching the given pattern
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Options:
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- all_files to search unchanged files at that revision.
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- diff to search files in the parent revision so diffs can be generated.
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- follow to skip files across copies and renames.
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"""
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def __init__(
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self, ui, repo, regexp, all_files=False, diff=False, follow=False
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):
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self._ui = ui
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self._repo = repo
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self._regexp = regexp
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self._all_files = all_files
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self._diff = diff
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self._follow = follow
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self._getfile = util.lrucachefunc(repo.file)
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self._getrenamed = scmutil.getrenamedfn(repo)
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self._matches = {}
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self._copies = {}
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self._skip = set()
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self._revfiles = {}
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def skipfile(self, fn, rev):
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"""Exclude the given file (and the copy at the specified revision)
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from future search"""
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copy = self._copies.get(rev, {}).get(fn)
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self._skip.add(fn)
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if copy:
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self._skip.add(copy)
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def searchfiles(self, revs, makefilematcher):
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"""Walk files and revisions to yield (fn, ctx, pstates, states)
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matches
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states is a list of linestate objects. pstates may be empty unless
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diff is True.
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"""
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for ctx in scmutil.walkchangerevs(
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self._repo, revs, makefilematcher, self._prep
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):
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rev = ctx.rev()
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parent = ctx.p1().rev()
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for fn in sorted(self._revfiles.get(rev, [])):
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states = self._matches[rev][fn]
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copy = self._copies.get(rev, {}).get(fn)
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if fn in self._skip:
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if copy:
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self._skip.add(copy)
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continue
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pstates = self._matches.get(parent, {}).get(copy or fn, [])
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if pstates or states:
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yield fn, ctx, pstates, states
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del self._revfiles[rev]
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# We will keep the matches dict for the duration of the window
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# clear the matches dict once the window is over
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if not self._revfiles:
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self._matches.clear()
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def _grepbody(self, fn, rev, body):
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self._matches[rev].setdefault(fn, [])
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m = self._matches[rev][fn]
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if body is None:
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return
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for lnum, cstart, cend, line in matchlines(body, self._regexp):
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s = linestate(line, lnum, cstart, cend)
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m.append(s)
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def _readfile(self, ctx, fn):
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rev = ctx.rev()
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if rev is None:
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fctx = ctx[fn]
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try:
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return fctx.data()
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except FileNotFoundError:
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pass
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else:
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flog = self._getfile(fn)
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fnode = ctx.filenode(fn)
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try:
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return flog.read(fnode)
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except error.CensoredNodeError:
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self._ui.warn(
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_(
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b'cannot search in censored file: '
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b'%(filename)s:%(revnum)s\n'
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)
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% {b'filename': fn, b'revnum': pycompat.bytestr(rev)}
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)
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def _prep(self, ctx, fmatch):
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rev = ctx.rev()
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pctx = ctx.p1()
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self._matches.setdefault(rev, {})
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if self._diff:
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parent = pctx.rev()
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self._matches.setdefault(parent, {})
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files = self._revfiles.setdefault(rev, [])
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if rev is None:
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# in `hg grep pattern`, 2/3 of the time is spent is spent in
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# pathauditor checks without this in mozilla-central
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contextmanager = self._repo.wvfs.audit.cached
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else:
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contextmanager = util.nullcontextmanager
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with contextmanager():
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# TODO: maybe better to warn missing files?
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if self._all_files:
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fmatch = matchmod.badmatch(fmatch, lambda f, msg: None)
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filenames = ctx.matches(fmatch)
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else:
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filenames = (f for f in ctx.files() if fmatch(f))
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for fn in filenames:
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# fn might not exist in the revision (could be a file removed by
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# the revision). We could check `fn not in ctx` even when rev is
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# None, but it's less racy to protect againt that in readfile.
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if rev is not None and fn not in ctx:
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continue
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copy = None
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if self._follow:
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copy = self._getrenamed(fn, rev)
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if copy:
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self._copies.setdefault(rev, {})[fn] = copy
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if fn in self._skip:
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self._skip.add(copy)
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if fn in self._skip:
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continue
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files.append(fn)
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if fn not in self._matches[rev]:
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self._grepbody(fn, rev, self._readfile(ctx, fn))
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if self._diff:
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pfn = copy or fn
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if pfn not in self._matches[parent] and pfn in pctx:
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self._grepbody(pfn, parent, self._readfile(pctx, pfn))
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