--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/mercurial/grep.py Wed Sep 09 15:23:49 2020 +0900
@@ -0,0 +1,71 @@
+# grep.py - logic for history walk and grep
+#
+# Copyright 2005-2007 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 difflib
+
+from . import pycompat
+
+
+def matchlines(body, regexp):
+ begin = 0
+ linenum = 0
+ while begin < len(body):
+ match = regexp.search(body, begin)
+ if not match:
+ break
+ mstart, mend = match.span()
+ linenum += body.count(b'\n', begin, mstart) + 1
+ lstart = body.rfind(b'\n', begin, mstart) + 1 or begin
+ begin = body.find(b'\n', mend) + 1 or len(body) + 1
+ lend = begin - 1
+ yield linenum, mstart - lstart, mend - lstart, body[lstart:lend]
+
+
+class linestate(object):
+ def __init__(self, line, linenum, colstart, colend):
+ self.line = line
+ self.linenum = linenum
+ self.colstart = colstart
+ self.colend = colend
+
+ def __hash__(self):
+ return hash(self.line)
+
+ def __eq__(self, other):
+ return self.line == other.line
+
+ def findpos(self, regexp):
+ """Iterate all (start, end) indices of matches"""
+ yield self.colstart, self.colend
+ p = self.colend
+ while p < len(self.line):
+ m = regexp.search(self.line, p)
+ if not m:
+ break
+ if m.end() == p:
+ p += 1
+ else:
+ yield m.span()
+ p = m.end()
+
+
+def difflinestates(a, b):
+ sm = difflib.SequenceMatcher(None, a, b)
+ for tag, alo, ahi, blo, bhi in sm.get_opcodes():
+ if tag == 'insert':
+ for i in pycompat.xrange(blo, bhi):
+ yield (b'+', b[i])
+ elif tag == 'delete':
+ for i in pycompat.xrange(alo, ahi):
+ yield (b'-', a[i])
+ elif tag == 'replace':
+ for i in pycompat.xrange(alo, ahi):
+ yield (b'-', a[i])
+ for i in pycompat.xrange(blo, bhi):
+ yield (b'+', b[i])