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# Copyright (C) 2004, 2005 Canonical Ltd
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, see <http://www.gnu.org/licenses/>.
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# mbp: "you know that thing where cvs gives you conflict markers?"
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# s: "i hate that."
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from __future__ import absolute_import
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import os
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import sys
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from .i18n import _
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from . import (
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mdiff,
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scmutil,
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util,
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)
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class CantReprocessAndShowBase(Exception):
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pass
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def intersect(ra, rb):
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"""Given two ranges return the range where they intersect or None.
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>>> intersect((0, 10), (0, 6))
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(0, 6)
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>>> intersect((0, 10), (5, 15))
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(5, 10)
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>>> intersect((0, 10), (10, 15))
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>>> intersect((0, 9), (10, 15))
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>>> intersect((0, 9), (7, 15))
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(7, 9)
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"""
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assert ra[0] <= ra[1]
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assert rb[0] <= rb[1]
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sa = max(ra[0], rb[0])
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sb = min(ra[1], rb[1])
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if sa < sb:
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return sa, sb
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else:
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return None
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def compare_range(a, astart, aend, b, bstart, bend):
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"""Compare a[astart:aend] == b[bstart:bend], without slicing.
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"""
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if (aend - astart) != (bend - bstart):
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return False
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for ia, ib in zip(xrange(astart, aend), xrange(bstart, bend)):
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if a[ia] != b[ib]:
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return False
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else:
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return True
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class Merge3Text(object):
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"""3-way merge of texts.
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Given strings BASE, OTHER, THIS, tries to produce a combined text
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incorporating the changes from both BASE->OTHER and BASE->THIS."""
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def __init__(self, basetext, atext, btext, base=None, a=None, b=None):
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self.basetext = basetext
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self.atext = atext
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self.btext = btext
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if base is None:
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base = mdiff.splitnewlines(basetext)
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if a is None:
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a = mdiff.splitnewlines(atext)
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if b is None:
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b = mdiff.splitnewlines(btext)
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self.base = base
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self.a = a
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self.b = b
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def merge_lines(self,
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name_a=None,
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name_b=None,
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name_base=None,
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start_marker='<<<<<<<',
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mid_marker='=======',
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end_marker='>>>>>>>',
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base_marker=None):
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"""Return merge in cvs-like form.
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"""
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self.conflicts = False
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newline = '\n'
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if len(self.a) > 0:
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if self.a[0].endswith('\r\n'):
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newline = '\r\n'
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elif self.a[0].endswith('\r'):
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newline = '\r'
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if name_a:
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start_marker = start_marker + ' ' + name_a
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if name_b:
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end_marker = end_marker + ' ' + name_b
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if name_base and base_marker:
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base_marker = base_marker + ' ' + name_base
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merge_regions = self.merge_regions()
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for t in merge_regions:
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what = t[0]
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if what == 'unchanged':
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for i in range(t[1], t[2]):
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yield self.base[i]
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elif what == 'a' or what == 'same':
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for i in range(t[1], t[2]):
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yield self.a[i]
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elif what == 'b':
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for i in range(t[1], t[2]):
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yield self.b[i]
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elif what == 'conflict':
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self.conflicts = True
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yield start_marker + newline
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for i in range(t[3], t[4]):
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yield self.a[i]
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if base_marker is not None:
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yield base_marker + newline
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for i in range(t[1], t[2]):
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yield self.base[i]
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yield mid_marker + newline
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for i in range(t[5], t[6]):
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yield self.b[i]
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yield end_marker + newline
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else:
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raise ValueError(what)
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def merge_groups(self):
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"""Yield sequence of line groups. Each one is a tuple:
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'unchanged', lines
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Lines unchanged from base
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'a', lines
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Lines taken from a
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'same', lines
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Lines taken from a (and equal to b)
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'b', lines
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Lines taken from b
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'conflict', base_lines, a_lines, b_lines
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Lines from base were changed to either a or b and conflict.
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"""
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for t in self.merge_regions():
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what = t[0]
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if what == 'unchanged':
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yield what, self.base[t[1]:t[2]]
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elif what == 'a' or what == 'same':
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yield what, self.a[t[1]:t[2]]
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elif what == 'b':
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yield what, self.b[t[1]:t[2]]
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elif what == 'conflict':
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yield (what,
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self.base[t[1]:t[2]],
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self.a[t[3]:t[4]],
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self.b[t[5]:t[6]])
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else:
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raise ValueError(what)
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def merge_regions(self):
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"""Return sequences of matching and conflicting regions.
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This returns tuples, where the first value says what kind we
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have:
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'unchanged', start, end
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Take a region of base[start:end]
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'same', astart, aend
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b and a are different from base but give the same result
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'a', start, end
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Non-clashing insertion from a[start:end]
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Method is as follows:
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The two sequences align only on regions which match the base
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and both descendants. These are found by doing a two-way diff
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of each one against the base, and then finding the
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intersections between those regions. These "sync regions"
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are by definition unchanged in both and easily dealt with.
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The regions in between can be in any of three cases:
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conflicted, or changed on only one side.
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"""
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# section a[0:ia] has been disposed of, etc
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iz = ia = ib = 0
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for region in self.find_sync_regions():
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zmatch, zend, amatch, aend, bmatch, bend = region
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#print 'match base [%d:%d]' % (zmatch, zend)
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matchlen = zend - zmatch
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assert matchlen >= 0
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assert matchlen == (aend - amatch)
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assert matchlen == (bend - bmatch)
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len_a = amatch - ia
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len_b = bmatch - ib
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len_base = zmatch - iz
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assert len_a >= 0
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assert len_b >= 0
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assert len_base >= 0
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#print 'unmatched a=%d, b=%d' % (len_a, len_b)
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if len_a or len_b:
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# try to avoid actually slicing the lists
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equal_a = compare_range(self.a, ia, amatch,
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self.base, iz, zmatch)
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equal_b = compare_range(self.b, ib, bmatch,
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self.base, iz, zmatch)
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same = compare_range(self.a, ia, amatch,
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self.b, ib, bmatch)
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if same:
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yield 'same', ia, amatch
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elif equal_a and not equal_b:
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yield 'b', ib, bmatch
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elif equal_b and not equal_a:
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yield 'a', ia, amatch
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elif not equal_a and not equal_b:
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yield 'conflict', iz, zmatch, ia, amatch, ib, bmatch
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else:
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raise AssertionError("can't handle a=b=base but unmatched")
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ia = amatch
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ib = bmatch
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iz = zmatch
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# if the same part of the base was deleted on both sides
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# that's OK, we can just skip it.
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if matchlen > 0:
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assert ia == amatch
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assert ib == bmatch
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assert iz == zmatch
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yield 'unchanged', zmatch, zend
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iz = zend
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ia = aend
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ib = bend
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def find_sync_regions(self):
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"""Return a list of sync regions, where both descendants match the base.
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Generates a list of (base1, base2, a1, a2, b1, b2). There is
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always a zero-length sync region at the end of all the files.
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"""
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ia = ib = 0
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amatches = mdiff.get_matching_blocks(self.basetext, self.atext)
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bmatches = mdiff.get_matching_blocks(self.basetext, self.btext)
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len_a = len(amatches)
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len_b = len(bmatches)
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sl = []
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while ia < len_a and ib < len_b:
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abase, amatch, alen = amatches[ia]
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bbase, bmatch, blen = bmatches[ib]
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# there is an unconflicted block at i; how long does it
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# extend? until whichever one ends earlier.
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i = intersect((abase, abase + alen), (bbase, bbase + blen))
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if i:
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intbase = i[0]
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intend = i[1]
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intlen = intend - intbase
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# found a match of base[i[0], i[1]]; this may be less than
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# the region that matches in either one
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assert intlen <= alen
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assert intlen <= blen
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assert abase <= intbase
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assert bbase <= intbase
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asub = amatch + (intbase - abase)
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bsub = bmatch + (intbase - bbase)
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aend = asub + intlen
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bend = bsub + intlen
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assert self.base[intbase:intend] == self.a[asub:aend], \
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(self.base[intbase:intend], self.a[asub:aend])
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assert self.base[intbase:intend] == self.b[bsub:bend]
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sl.append((intbase, intend,
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asub, aend,
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bsub, bend))
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# advance whichever one ends first in the base text
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if (abase + alen) < (bbase + blen):
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ia += 1
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else:
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ib += 1
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intbase = len(self.base)
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abase = len(self.a)
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bbase = len(self.b)
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sl.append((intbase, intbase, abase, abase, bbase, bbase))
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return sl
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def find_unconflicted(self):
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"""Return a list of ranges in base that are not conflicted."""
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am = mdiff.get_matching_blocks(self.basetext, self.atext)
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bm = mdiff.get_matching_blocks(self.basetext, self.btext)
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unc = []
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while am and bm:
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# there is an unconflicted block at i; how long does it
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# extend? until whichever one ends earlier.
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a1 = am[0][0]
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a2 = a1 + am[0][2]
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b1 = bm[0][0]
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b2 = b1 + bm[0][2]
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i = intersect((a1, a2), (b1, b2))
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if i:
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unc.append(i)
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if a2 < b2:
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del am[0]
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else:
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del bm[0]
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return unc
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def simplemerge(ui, local, base, other, **opts):
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def readfile(filename):
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f = open(filename, "rb")
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text = f.read()
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f.close()
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if util.binary(text):
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msg = _("%s looks like a binary file.") % filename
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if not opts.get('quiet'):
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ui.warn(_('warning: %s\n') % msg)
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if not opts.get('text'):
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raise util.Abort(msg)
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return text
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name_a = local
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name_b = other
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name_base = None
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labels = opts.get('label', [])
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if len(labels) > 0:
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name_a = labels[0]
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if len(labels) > 1:
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name_b = labels[1]
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if len(labels) > 2:
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name_base = labels[2]
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if len(labels) > 3:
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raise util.Abort(_("can only specify three labels."))
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try:
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localtext = readfile(local)
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basetext = readfile(base)
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othertext = readfile(other)
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except util.Abort:
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return 1
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local = os.path.realpath(local)
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if not opts.get('print'):
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opener = scmutil.opener(os.path.dirname(local))
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out = opener(os.path.basename(local), "w", atomictemp=True)
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else:
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out = sys.stdout
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m3 = Merge3Text(basetext, localtext, othertext)
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extrakwargs = {}
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if name_base is not None:
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extrakwargs['base_marker'] = '|||||||'
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extrakwargs['name_base'] = name_base
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for line in m3.merge_lines(name_a=name_a, name_b=name_b, **extrakwargs):
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out.write(line)
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if not opts.get('print'):
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out.close()
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if m3.conflicts:
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if not opts.get('quiet'):
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ui.warn(_("warning: conflicts during merge.\n"))
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return 1
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