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ba311807f8
If 'current-file' does not contain LF at EOF, and change between
'base-file' and 'other-file' does not change any line close to EOF, the
3-way merge should not add LF to EOF. This is what 'diff3 -m' does, and
seems to be a reasonable expectation.
The change which introduced the behavior is cd1d61c44f. It always calls
function xdl_recs_copy() for sides with add_nl == 1. In fact, it looks
like the only case when this is needed is when 2 files are being
union-merged, and they do not have LF at EOF (strictly speaking, the
first of them).
Add tests:
* "merge without conflict (missing LF at EOF, away from change in the
other file)" and "merge does not add LF away of change", to demonstrate
the changed behavior.
* "conflict at EOF without LF resolved by --union", to verify that the
union-merge at the end inerts newline between versions.
* some more tests which I felt like not covering the functionality well
Signed-off-by: Max Kirillov <max@max630.net>
Acked-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
619 lines
15 KiB
C
619 lines
15 KiB
C
/*
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* LibXDiff by Davide Libenzi ( File Differential Library )
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* Copyright (C) 2003-2006 Davide Libenzi, Johannes E. Schindelin
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Davide Libenzi <davidel@xmailserver.org>
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*
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*/
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#include "xinclude.h"
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typedef struct s_xdmerge {
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struct s_xdmerge *next;
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/*
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* 0 = conflict,
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* 1 = no conflict, take first,
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* 2 = no conflict, take second.
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* 3 = no conflict, take both.
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*/
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int mode;
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/*
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* These point at the respective postimages. E.g. <i1,chg1> is
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* how side #1 wants to change the common ancestor; if there is no
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* overlap, lines before i1 in the postimage of side #1 appear
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* in the merge result as a region touched by neither side.
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*/
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long i1, i2;
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long chg1, chg2;
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/*
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* These point at the preimage; of course there is just one
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* preimage, that is from the shared common ancestor.
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*/
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long i0;
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long chg0;
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} xdmerge_t;
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static int xdl_append_merge(xdmerge_t **merge, int mode,
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long i0, long chg0,
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long i1, long chg1,
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long i2, long chg2)
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{
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xdmerge_t *m = *merge;
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if (m && (i1 <= m->i1 + m->chg1 || i2 <= m->i2 + m->chg2)) {
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if (mode != m->mode)
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m->mode = 0;
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m->chg0 = i0 + chg0 - m->i0;
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m->chg1 = i1 + chg1 - m->i1;
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m->chg2 = i2 + chg2 - m->i2;
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} else {
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m = xdl_malloc(sizeof(xdmerge_t));
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if (!m)
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return -1;
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m->next = NULL;
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m->mode = mode;
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m->i0 = i0;
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m->chg0 = chg0;
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m->i1 = i1;
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m->chg1 = chg1;
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m->i2 = i2;
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m->chg2 = chg2;
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if (*merge)
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(*merge)->next = m;
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*merge = m;
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}
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return 0;
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}
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static int xdl_cleanup_merge(xdmerge_t *c)
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{
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int count = 0;
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xdmerge_t *next_c;
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/* were there conflicts? */
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for (; c; c = next_c) {
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if (c->mode == 0)
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count++;
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next_c = c->next;
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free(c);
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}
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return count;
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}
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static int xdl_merge_cmp_lines(xdfenv_t *xe1, int i1, xdfenv_t *xe2, int i2,
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int line_count, long flags)
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{
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int i;
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xrecord_t **rec1 = xe1->xdf2.recs + i1;
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xrecord_t **rec2 = xe2->xdf2.recs + i2;
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for (i = 0; i < line_count; i++) {
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int result = xdl_recmatch(rec1[i]->ptr, rec1[i]->size,
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rec2[i]->ptr, rec2[i]->size, flags);
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if (!result)
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return -1;
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}
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return 0;
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}
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static int xdl_recs_copy_0(int use_orig, xdfenv_t *xe, int i, int count, int add_nl, char *dest)
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{
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xrecord_t **recs;
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int size = 0;
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recs = (use_orig ? xe->xdf1.recs : xe->xdf2.recs) + i;
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if (count < 1)
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return 0;
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for (i = 0; i < count; size += recs[i++]->size)
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if (dest)
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memcpy(dest + size, recs[i]->ptr, recs[i]->size);
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if (add_nl) {
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i = recs[count - 1]->size;
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if (i == 0 || recs[count - 1]->ptr[i - 1] != '\n') {
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if (dest)
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dest[size] = '\n';
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size++;
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}
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}
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return size;
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}
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static int xdl_recs_copy(xdfenv_t *xe, int i, int count, int add_nl, char *dest)
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{
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return xdl_recs_copy_0(0, xe, i, count, add_nl, dest);
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}
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static int xdl_orig_copy(xdfenv_t *xe, int i, int count, int add_nl, char *dest)
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{
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return xdl_recs_copy_0(1, xe, i, count, add_nl, dest);
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}
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static int fill_conflict_hunk(xdfenv_t *xe1, const char *name1,
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xdfenv_t *xe2, const char *name2,
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const char *name3,
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int size, int i, int style,
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xdmerge_t *m, char *dest, int marker_size)
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{
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int marker1_size = (name1 ? strlen(name1) + 1 : 0);
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int marker2_size = (name2 ? strlen(name2) + 1 : 0);
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int marker3_size = (name3 ? strlen(name3) + 1 : 0);
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if (marker_size <= 0)
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marker_size = DEFAULT_CONFLICT_MARKER_SIZE;
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/* Before conflicting part */
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size += xdl_recs_copy(xe1, i, m->i1 - i, 0,
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dest ? dest + size : NULL);
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if (!dest) {
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size += marker_size + 1 + marker1_size;
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} else {
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memset(dest + size, '<', marker_size);
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size += marker_size;
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if (marker1_size) {
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dest[size] = ' ';
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memcpy(dest + size + 1, name1, marker1_size - 1);
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size += marker1_size;
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}
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dest[size++] = '\n';
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}
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/* Postimage from side #1 */
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size += xdl_recs_copy(xe1, m->i1, m->chg1, 1,
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dest ? dest + size : NULL);
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if (style == XDL_MERGE_DIFF3) {
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/* Shared preimage */
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if (!dest) {
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size += marker_size + 1 + marker3_size;
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} else {
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memset(dest + size, '|', marker_size);
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size += marker_size;
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if (marker3_size) {
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dest[size] = ' ';
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memcpy(dest + size + 1, name3, marker3_size - 1);
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size += marker3_size;
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}
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dest[size++] = '\n';
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}
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size += xdl_orig_copy(xe1, m->i0, m->chg0, 1,
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dest ? dest + size : NULL);
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}
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if (!dest) {
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size += marker_size + 1;
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} else {
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memset(dest + size, '=', marker_size);
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size += marker_size;
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dest[size++] = '\n';
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}
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/* Postimage from side #2 */
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size += xdl_recs_copy(xe2, m->i2, m->chg2, 1,
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dest ? dest + size : NULL);
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if (!dest) {
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size += marker_size + 1 + marker2_size;
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} else {
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memset(dest + size, '>', marker_size);
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size += marker_size;
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if (marker2_size) {
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dest[size] = ' ';
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memcpy(dest + size + 1, name2, marker2_size - 1);
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size += marker2_size;
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}
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dest[size++] = '\n';
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}
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return size;
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}
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static int xdl_fill_merge_buffer(xdfenv_t *xe1, const char *name1,
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xdfenv_t *xe2, const char *name2,
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const char *ancestor_name,
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int favor,
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xdmerge_t *m, char *dest, int style,
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int marker_size)
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{
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int size, i;
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for (size = i = 0; m; m = m->next) {
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if (favor && !m->mode)
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m->mode = favor;
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if (m->mode == 0)
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size = fill_conflict_hunk(xe1, name1, xe2, name2,
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ancestor_name,
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size, i, style, m, dest,
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marker_size);
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else if (m->mode & 3) {
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/* Before conflicting part */
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size += xdl_recs_copy(xe1, i, m->i1 - i, 0,
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dest ? dest + size : NULL);
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/* Postimage from side #1 */
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if (m->mode & 1)
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size += xdl_recs_copy(xe1, m->i1, m->chg1, (m->mode & 2),
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dest ? dest + size : NULL);
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/* Postimage from side #2 */
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if (m->mode & 2)
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size += xdl_recs_copy(xe2, m->i2, m->chg2, 0,
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dest ? dest + size : NULL);
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} else
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continue;
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i = m->i1 + m->chg1;
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}
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size += xdl_recs_copy(xe1, i, xe1->xdf2.nrec - i, 0,
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dest ? dest + size : NULL);
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return size;
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}
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/*
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* Sometimes, changes are not quite identical, but differ in only a few
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* lines. Try hard to show only these few lines as conflicting.
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*/
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static int xdl_refine_conflicts(xdfenv_t *xe1, xdfenv_t *xe2, xdmerge_t *m,
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xpparam_t const *xpp)
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{
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for (; m; m = m->next) {
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mmfile_t t1, t2;
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xdfenv_t xe;
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xdchange_t *xscr, *x;
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int i1 = m->i1, i2 = m->i2;
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/* let's handle just the conflicts */
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if (m->mode)
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continue;
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/* no sense refining a conflict when one side is empty */
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if (m->chg1 == 0 || m->chg2 == 0)
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continue;
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/*
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* This probably does not work outside git, since
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* we have a very simple mmfile structure.
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*/
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t1.ptr = (char *)xe1->xdf2.recs[m->i1]->ptr;
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t1.size = xe1->xdf2.recs[m->i1 + m->chg1 - 1]->ptr
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+ xe1->xdf2.recs[m->i1 + m->chg1 - 1]->size - t1.ptr;
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t2.ptr = (char *)xe2->xdf2.recs[m->i2]->ptr;
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t2.size = xe2->xdf2.recs[m->i2 + m->chg2 - 1]->ptr
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+ xe2->xdf2.recs[m->i2 + m->chg2 - 1]->size - t2.ptr;
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if (xdl_do_diff(&t1, &t2, xpp, &xe) < 0)
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return -1;
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if (xdl_change_compact(&xe.xdf1, &xe.xdf2, xpp->flags) < 0 ||
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xdl_change_compact(&xe.xdf2, &xe.xdf1, xpp->flags) < 0 ||
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xdl_build_script(&xe, &xscr) < 0) {
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xdl_free_env(&xe);
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return -1;
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}
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if (!xscr) {
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/* If this happens, the changes are identical. */
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xdl_free_env(&xe);
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m->mode = 4;
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continue;
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}
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x = xscr;
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m->i1 = xscr->i1 + i1;
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m->chg1 = xscr->chg1;
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m->i2 = xscr->i2 + i2;
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m->chg2 = xscr->chg2;
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while (xscr->next) {
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xdmerge_t *m2 = xdl_malloc(sizeof(xdmerge_t));
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if (!m2) {
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xdl_free_env(&xe);
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xdl_free_script(x);
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return -1;
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}
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xscr = xscr->next;
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m2->next = m->next;
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m->next = m2;
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m = m2;
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m->mode = 0;
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m->i1 = xscr->i1 + i1;
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m->chg1 = xscr->chg1;
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m->i2 = xscr->i2 + i2;
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m->chg2 = xscr->chg2;
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}
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xdl_free_env(&xe);
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xdl_free_script(x);
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}
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return 0;
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}
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static int line_contains_alnum(const char *ptr, long size)
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{
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while (size--)
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if (isalnum((unsigned char)*(ptr++)))
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return 1;
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return 0;
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}
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static int lines_contain_alnum(xdfenv_t *xe, int i, int chg)
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{
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for (; chg; chg--, i++)
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if (line_contains_alnum(xe->xdf2.recs[i]->ptr,
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xe->xdf2.recs[i]->size))
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return 1;
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return 0;
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}
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/*
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* This function merges m and m->next, marking everything between those hunks
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* as conflicting, too.
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*/
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static void xdl_merge_two_conflicts(xdmerge_t *m)
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{
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xdmerge_t *next_m = m->next;
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m->chg1 = next_m->i1 + next_m->chg1 - m->i1;
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m->chg2 = next_m->i2 + next_m->chg2 - m->i2;
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m->next = next_m->next;
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free(next_m);
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}
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/*
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* If there are less than 3 non-conflicting lines between conflicts,
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* it appears simpler -- because it takes up less (or as many) lines --
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* if the lines are moved into the conflicts.
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*/
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static int xdl_simplify_non_conflicts(xdfenv_t *xe1, xdmerge_t *m,
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int simplify_if_no_alnum)
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{
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int result = 0;
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if (!m)
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return result;
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for (;;) {
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xdmerge_t *next_m = m->next;
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int begin, end;
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if (!next_m)
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return result;
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begin = m->i1 + m->chg1;
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end = next_m->i1;
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if (m->mode != 0 || next_m->mode != 0 ||
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(end - begin > 3 &&
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(!simplify_if_no_alnum ||
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lines_contain_alnum(xe1, begin, end - begin)))) {
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m = next_m;
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} else {
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result++;
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xdl_merge_two_conflicts(m);
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}
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}
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}
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/*
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* level == 0: mark all overlapping changes as conflict
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* level == 1: mark overlapping changes as conflict only if not identical
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* level == 2: analyze non-identical changes for minimal conflict set
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* level == 3: analyze non-identical changes for minimal conflict set, but
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* treat hunks not containing any letter or number as conflicting
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*
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* returns < 0 on error, == 0 for no conflicts, else number of conflicts
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*/
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static int xdl_do_merge(xdfenv_t *xe1, xdchange_t *xscr1,
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xdfenv_t *xe2, xdchange_t *xscr2,
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xmparam_t const *xmp, mmbuffer_t *result)
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{
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xdmerge_t *changes, *c;
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xpparam_t const *xpp = &xmp->xpp;
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const char *const ancestor_name = xmp->ancestor;
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const char *const name1 = xmp->file1;
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const char *const name2 = xmp->file2;
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int i0, i1, i2, chg0, chg1, chg2;
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int level = xmp->level;
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int style = xmp->style;
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int favor = xmp->favor;
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if (style == XDL_MERGE_DIFF3) {
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/*
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* "diff3 -m" output does not make sense for anything
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* more aggressive than XDL_MERGE_EAGER.
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*/
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if (XDL_MERGE_EAGER < level)
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level = XDL_MERGE_EAGER;
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}
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c = changes = NULL;
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while (xscr1 && xscr2) {
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if (!changes)
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changes = c;
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if (xscr1->i1 + xscr1->chg1 < xscr2->i1) {
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i0 = xscr1->i1;
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i1 = xscr1->i2;
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i2 = xscr2->i2 - xscr2->i1 + xscr1->i1;
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chg0 = xscr1->chg1;
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chg1 = xscr1->chg2;
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chg2 = xscr1->chg1;
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if (xdl_append_merge(&c, 1,
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i0, chg0, i1, chg1, i2, chg2)) {
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xdl_cleanup_merge(changes);
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return -1;
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}
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xscr1 = xscr1->next;
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continue;
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}
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if (xscr2->i1 + xscr2->chg1 < xscr1->i1) {
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i0 = xscr2->i1;
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i1 = xscr1->i2 - xscr1->i1 + xscr2->i1;
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i2 = xscr2->i2;
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chg0 = xscr2->chg1;
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chg1 = xscr2->chg1;
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chg2 = xscr2->chg2;
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if (xdl_append_merge(&c, 2,
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i0, chg0, i1, chg1, i2, chg2)) {
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xdl_cleanup_merge(changes);
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return -1;
|
|
}
|
|
xscr2 = xscr2->next;
|
|
continue;
|
|
}
|
|
if (level == XDL_MERGE_MINIMAL || xscr1->i1 != xscr2->i1 ||
|
|
xscr1->chg1 != xscr2->chg1 ||
|
|
xscr1->chg2 != xscr2->chg2 ||
|
|
xdl_merge_cmp_lines(xe1, xscr1->i2,
|
|
xe2, xscr2->i2,
|
|
xscr1->chg2, xpp->flags)) {
|
|
/* conflict */
|
|
int off = xscr1->i1 - xscr2->i1;
|
|
int ffo = off + xscr1->chg1 - xscr2->chg1;
|
|
|
|
i0 = xscr1->i1;
|
|
i1 = xscr1->i2;
|
|
i2 = xscr2->i2;
|
|
if (off > 0) {
|
|
i0 -= off;
|
|
i1 -= off;
|
|
}
|
|
else
|
|
i2 += off;
|
|
chg0 = xscr1->i1 + xscr1->chg1 - i0;
|
|
chg1 = xscr1->i2 + xscr1->chg2 - i1;
|
|
chg2 = xscr2->i2 + xscr2->chg2 - i2;
|
|
if (ffo < 0) {
|
|
chg0 -= ffo;
|
|
chg1 -= ffo;
|
|
} else
|
|
chg2 += ffo;
|
|
if (xdl_append_merge(&c, 0,
|
|
i0, chg0, i1, chg1, i2, chg2)) {
|
|
xdl_cleanup_merge(changes);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
i1 = xscr1->i1 + xscr1->chg1;
|
|
i2 = xscr2->i1 + xscr2->chg1;
|
|
|
|
if (i1 >= i2)
|
|
xscr2 = xscr2->next;
|
|
if (i2 >= i1)
|
|
xscr1 = xscr1->next;
|
|
}
|
|
while (xscr1) {
|
|
if (!changes)
|
|
changes = c;
|
|
i0 = xscr1->i1;
|
|
i1 = xscr1->i2;
|
|
i2 = xscr1->i1 + xe2->xdf2.nrec - xe2->xdf1.nrec;
|
|
chg0 = xscr1->chg1;
|
|
chg1 = xscr1->chg2;
|
|
chg2 = xscr1->chg1;
|
|
if (xdl_append_merge(&c, 1,
|
|
i0, chg0, i1, chg1, i2, chg2)) {
|
|
xdl_cleanup_merge(changes);
|
|
return -1;
|
|
}
|
|
xscr1 = xscr1->next;
|
|
}
|
|
while (xscr2) {
|
|
if (!changes)
|
|
changes = c;
|
|
i0 = xscr2->i1;
|
|
i1 = xscr2->i1 + xe1->xdf2.nrec - xe1->xdf1.nrec;
|
|
i2 = xscr2->i2;
|
|
chg0 = xscr2->chg1;
|
|
chg1 = xscr2->chg1;
|
|
chg2 = xscr2->chg2;
|
|
if (xdl_append_merge(&c, 2,
|
|
i0, chg0, i1, chg1, i2, chg2)) {
|
|
xdl_cleanup_merge(changes);
|
|
return -1;
|
|
}
|
|
xscr2 = xscr2->next;
|
|
}
|
|
if (!changes)
|
|
changes = c;
|
|
/* refine conflicts */
|
|
if (XDL_MERGE_ZEALOUS <= level &&
|
|
(xdl_refine_conflicts(xe1, xe2, changes, xpp) < 0 ||
|
|
xdl_simplify_non_conflicts(xe1, changes,
|
|
XDL_MERGE_ZEALOUS < level) < 0)) {
|
|
xdl_cleanup_merge(changes);
|
|
return -1;
|
|
}
|
|
/* output */
|
|
if (result) {
|
|
int marker_size = xmp->marker_size;
|
|
int size = xdl_fill_merge_buffer(xe1, name1, xe2, name2,
|
|
ancestor_name,
|
|
favor, changes, NULL, style,
|
|
marker_size);
|
|
result->ptr = xdl_malloc(size);
|
|
if (!result->ptr) {
|
|
xdl_cleanup_merge(changes);
|
|
return -1;
|
|
}
|
|
result->size = size;
|
|
xdl_fill_merge_buffer(xe1, name1, xe2, name2,
|
|
ancestor_name, favor, changes,
|
|
result->ptr, style, marker_size);
|
|
}
|
|
return xdl_cleanup_merge(changes);
|
|
}
|
|
|
|
int xdl_merge(mmfile_t *orig, mmfile_t *mf1, mmfile_t *mf2,
|
|
xmparam_t const *xmp, mmbuffer_t *result)
|
|
{
|
|
xdchange_t *xscr1, *xscr2;
|
|
xdfenv_t xe1, xe2;
|
|
int status;
|
|
xpparam_t const *xpp = &xmp->xpp;
|
|
|
|
result->ptr = NULL;
|
|
result->size = 0;
|
|
|
|
if (xdl_do_diff(orig, mf1, xpp, &xe1) < 0 ||
|
|
xdl_do_diff(orig, mf2, xpp, &xe2) < 0) {
|
|
return -1;
|
|
}
|
|
if (xdl_change_compact(&xe1.xdf1, &xe1.xdf2, xpp->flags) < 0 ||
|
|
xdl_change_compact(&xe1.xdf2, &xe1.xdf1, xpp->flags) < 0 ||
|
|
xdl_build_script(&xe1, &xscr1) < 0) {
|
|
xdl_free_env(&xe1);
|
|
return -1;
|
|
}
|
|
if (xdl_change_compact(&xe2.xdf1, &xe2.xdf2, xpp->flags) < 0 ||
|
|
xdl_change_compact(&xe2.xdf2, &xe2.xdf1, xpp->flags) < 0 ||
|
|
xdl_build_script(&xe2, &xscr2) < 0) {
|
|
xdl_free_env(&xe2);
|
|
return -1;
|
|
}
|
|
status = 0;
|
|
if (!xscr1) {
|
|
result->ptr = xdl_malloc(mf2->size);
|
|
memcpy(result->ptr, mf2->ptr, mf2->size);
|
|
result->size = mf2->size;
|
|
} else if (!xscr2) {
|
|
result->ptr = xdl_malloc(mf1->size);
|
|
memcpy(result->ptr, mf1->ptr, mf1->size);
|
|
result->size = mf1->size;
|
|
} else {
|
|
status = xdl_do_merge(&xe1, xscr1,
|
|
&xe2, xscr2,
|
|
xmp, result);
|
|
}
|
|
xdl_free_script(xscr1);
|
|
xdl_free_script(xscr2);
|
|
|
|
xdl_free_env(&xe1);
|
|
xdl_free_env(&xe2);
|
|
|
|
return status;
|
|
}
|