Mercurial > hg
view mercurial/diffhelper.py @ 51099:eba138890c64
revlog: move entry writing in the inner object
This is the second big piece of API we want to live on the inner object. With
this the inner object have freedom it needs to implement things internally.
(except for the delayed write feature of the changelog, that will be migrated in coming changesets)
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Thu, 19 Oct 2023 05:19:55 +0200 |
parents | d44e3c45f0e4 |
children |
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# diffhelper.py - helper routines for patch # # Copyright 2009 Olivia Mackall <olivia@selenic.com> and others # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from .i18n import _ from . import ( error, ) MISSING_NEWLINE_MARKER = b'\\ No newline at end of file\n' def addlines(fp, hunk, lena, lenb, a, b): """Read lines from fp into the hunk The hunk is parsed into two arrays, a and b. a gets the old state of the text, b gets the new state. The control char from the hunk is saved when inserting into a, but not b (for performance while deleting files.) """ while True: todoa = lena - len(a) todob = lenb - len(b) num = max(todoa, todob) if num == 0: break for i in range(num): s = fp.readline() if not s: raise error.ParseError(_(b'incomplete hunk')) if s == MISSING_NEWLINE_MARKER: fixnewline(hunk, a, b) continue if s == b'\n' or s == b'\r\n': # Some patches may be missing the control char # on empty lines. Supply a leading space. s = b' ' + s hunk.append(s) if s.startswith(b'+'): b.append(s[1:]) elif s.startswith(b'-'): a.append(s) else: b.append(s[1:]) a.append(s) def fixnewline(hunk, a, b): """Fix up the last lines of a and b when the patch has no newline at EOF""" l = hunk[-1] # tolerate CRLF in last line if l.endswith(b'\r\n'): hline = l[:-2] else: hline = l[:-1] if hline.startswith((b' ', b'+')): b[-1] = hline[1:] if hline.startswith((b' ', b'-')): a[-1] = hline hunk[-1] = hline def testhunk(a, b, bstart): """Compare the lines in a with the lines in b a is assumed to have a control char at the start of each line, this char is ignored in the compare. """ alen = len(a) blen = len(b) if alen > blen - bstart or bstart < 0: return False for i in range(alen): if a[i][1:] != b[i + bstart]: return False return True