diff options
| -rw-r--r-- | Makefile | 3 | ||||
| -rw-r--r-- | xdiff/xdiff.h | 7 | ||||
| -rw-r--r-- | xdiff/xdiffi.c | 3 | ||||
| -rw-r--r-- | xdiff/xdiffi.h | 1 | ||||
| -rw-r--r-- | xdiff/xmerge.c | 433 |
5 files changed, 444 insertions, 3 deletions
@@ -723,7 +723,8 @@ $(DIFF_OBJS): diffcore.h $(LIB_FILE): $(LIB_OBJS) rm -f $@ && $(AR) rcs $@ $(LIB_OBJS) -XDIFF_OBJS=xdiff/xdiffi.o xdiff/xprepare.o xdiff/xutils.o xdiff/xemit.o +XDIFF_OBJS=xdiff/xdiffi.o xdiff/xprepare.o xdiff/xutils.o xdiff/xemit.o \ + xdiff/xmerge.o $(XDIFF_OBJS): xdiff/xinclude.h xdiff/xmacros.h xdiff/xdiff.h xdiff/xtypes.h \ xdiff/xutils.h xdiff/xprepare.h xdiff/xdiffi.h xdiff/xemit.h diff --git a/xdiff/xdiff.h b/xdiff/xdiff.h index c9f817818..fa409d523 100644 --- a/xdiff/xdiff.h +++ b/xdiff/xdiff.h @@ -49,6 +49,9 @@ extern "C" { #define XDL_BDOP_CPY 2 #define XDL_BDOP_INSB 3 +#define XDL_MERGE_MINIMAL 0 +#define XDL_MERGE_EAGER 1 +#define XDL_MERGE_ZEALOUS 2 typedef struct s_mmfile { char *ptr; @@ -90,6 +93,10 @@ long xdl_mmfile_size(mmfile_t *mmf); int xdl_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp, xdemitconf_t const *xecfg, xdemitcb_t *ecb); +int xdl_merge(mmfile_t *orig, mmfile_t *mf1, const char *name1, + mmfile_t *mf2, const char *name2, + xpparam_t const *xpp, int level, mmbuffer_t *result); + #ifdef __cplusplus } #endif /* #ifdef __cplusplus */ diff --git a/xdiff/xdiffi.c b/xdiff/xdiffi.c index d76e76a0e..9aeebc473 100644 --- a/xdiff/xdiffi.c +++ b/xdiff/xdiffi.c @@ -45,7 +45,6 @@ static long xdl_split(unsigned long const *ha1, long off1, long lim1, long *kvdf, long *kvdb, int need_min, xdpsplit_t *spl, xdalgoenv_t *xenv); static xdchange_t *xdl_add_change(xdchange_t *xscr, long i1, long i2, long chg1, long chg2); -static int xdl_change_compact(xdfile_t *xdf, xdfile_t *xdfo, long flags); @@ -397,7 +396,7 @@ static xdchange_t *xdl_add_change(xdchange_t *xscr, long i1, long i2, long chg1, } -static int xdl_change_compact(xdfile_t *xdf, xdfile_t *xdfo, long flags) { +int xdl_change_compact(xdfile_t *xdf, xdfile_t *xdfo, long flags) { long ix, ixo, ixs, ixref, grpsiz, nrec = xdf->nrec; char *rchg = xdf->rchg, *rchgo = xdfo->rchg; xrecord_t **recs = xdf->recs; diff --git a/xdiff/xdiffi.h b/xdiff/xdiffi.h index d3b72716b..472aeaecf 100644 --- a/xdiff/xdiffi.h +++ b/xdiff/xdiffi.h @@ -50,6 +50,7 @@ int xdl_recs_cmp(diffdata_t *dd1, long off1, long lim1, long *kvdf, long *kvdb, int need_min, xdalgoenv_t *xenv); int xdl_do_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp, xdfenv_t *xe); +int xdl_change_compact(xdfile_t *xdf, xdfile_t *xdfo, long flags); int xdl_build_script(xdfenv_t *xe, xdchange_t **xscr); void xdl_free_script(xdchange_t *xscr); int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb, diff --git a/xdiff/xmerge.c b/xdiff/xmerge.c new file mode 100644 index 000000000..7b85aa590 --- /dev/null +++ b/xdiff/xmerge.c @@ -0,0 +1,433 @@ +/* + * LibXDiff by Davide Libenzi ( File Differential Library ) + * Copyright (C) 2003-2006 Davide Libenzi, Johannes E. Schindelin + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Davide Libenzi <davidel@xmailserver.org> + * + */ + +#include "xinclude.h" + +typedef struct s_xdmerge { + struct s_xdmerge *next; + /* + * 0 = conflict, + * 1 = no conflict, take first, + * 2 = no conflict, take second. + */ + int mode; + long i1, i2; + long chg1, chg2; +} xdmerge_t; + +static int xdl_append_merge(xdmerge_t **merge, int mode, + long i1, long chg1, long i2, long chg2) +{ + xdmerge_t *m = *merge; + if (m && mode == m->mode && + (i1 == m->i1 + m->chg1 || i2 == m->i2 + m->chg2)) { + m->chg1 = i1 + chg1 - m->i1; + m->chg2 = i2 + chg2 - m->i2; + } else { + m = xdl_malloc(sizeof(xdmerge_t)); + if (!m) + return -1; + m->next = NULL; + m->mode = mode; + m->i1 = i1; + m->chg1 = chg1; + m->i2 = i2; + m->chg2 = chg2; + if (*merge) + (*merge)->next = m; + *merge = m; + } + return 0; +} + +static int xdl_cleanup_merge(xdmerge_t *c) +{ + int count = 0; + xdmerge_t *next_c; + + /* were there conflicts? */ + for (; c; c = next_c) { + if (c->mode == 0) + count++; + next_c = c->next; + free(c); + } + return count; +} + +static int xdl_merge_cmp_lines(xdfenv_t *xe1, int i1, xdfenv_t *xe2, int i2, + int line_count, long flags) +{ + int i; + xrecord_t **rec1 = xe1->xdf2.recs + i1; + xrecord_t **rec2 = xe2->xdf2.recs + i2; + + for (i = 0; i < line_count; i++) { + int result = xdl_recmatch(rec1[i]->ptr, rec1[i]->size, + rec2[i]->ptr, rec2[i]->size, flags); + if (!result) + return -1; + } + return 0; +} + +static int xdl_recs_copy(xdfenv_t *xe, int i, int count, int add_nl, char *dest) +{ + xrecord_t **recs = xe->xdf2.recs + i; + int size = 0; + + if (count < 1) + return 0; + + for (i = 0; i < count; size += recs[i++]->size) + if (dest) + memcpy(dest + size, recs[i]->ptr, recs[i]->size); + if (add_nl) { + i = recs[count - 1]->size; + if (i == 0 || recs[count - 1]->ptr[i - 1] != '\n') { + if (dest) + dest[size] = '\n'; + size++; + } + } + return size; +} + +static int xdl_fill_merge_buffer(xdfenv_t *xe1, const char *name1, + xdfenv_t *xe2, const char *name2, xdmerge_t *m, char *dest) +{ + const int marker_size = 7; + int marker1_size = (name1 ? strlen(name1) + 1 : 0); + int marker2_size = (name2 ? strlen(name2) + 1 : 0); + int conflict_marker_size = 3 * (marker_size + 1) + + marker1_size + marker2_size; + int size, i1, j; + + for (size = i1 = 0; m; m = m->next) { + if (m->mode == 0) { + size += xdl_recs_copy(xe1, i1, m->i1 - i1, 0, + dest ? dest + size : NULL); + if (dest) { + for (j = 0; j < marker_size; j++) + dest[size++] = '<'; + if (marker1_size) { + dest[size] = ' '; + memcpy(dest + size + 1, name1, + marker1_size - 1); + size += marker1_size; + } + dest[size++] = '\n'; + } else + size += conflict_marker_size; + size += xdl_recs_copy(xe1, m->i1, m->chg1, 1, + dest ? dest + size : NULL); + if (dest) { + for (j = 0; j < marker_size; j++) + dest[size++] = '='; + dest[size++] = '\n'; + } + size += xdl_recs_copy(xe2, m->i2, m->chg2, 1, + dest ? dest + size : NULL); + if (dest) { + for (j = 0; j < marker_size; j++) + dest[size++] = '>'; + if (marker2_size) { + dest[size] = ' '; + memcpy(dest + size + 1, name2, + marker2_size - 1); + size += marker2_size; + } + dest[size++] = '\n'; + } + } else if (m->mode == 1) + size += xdl_recs_copy(xe1, i1, m->i1 + m->chg1 - i1, 0, + dest ? dest + size : NULL); + else if (m->mode == 2) + size += xdl_recs_copy(xe2, m->i2 - m->i1 + i1, + m->i1 + m->chg2 - i1, 0, + dest ? dest + size : NULL); + i1 = m->i1 + m->chg1; + } + size += xdl_recs_copy(xe1, i1, xe1->xdf2.nrec - i1, 0, + dest ? dest + size : NULL); + return size; +} + +/* + * Sometimes, changes are not quite identical, but differ in only a few + * lines. Try hard to show only these few lines as conflicting. + */ +static int xdl_refine_conflicts(xdfenv_t *xe1, xdfenv_t *xe2, xdmerge_t *m, + xpparam_t const *xpp) +{ + for (; m; m = m->next) { + mmfile_t t1, t2; + xdfenv_t xe; + xdchange_t *xscr, *x; + int i1 = m->i1, i2 = m->i2; + + /* let's handle just the conflicts */ + if (m->mode) + continue; + + /* + * This probably does not work outside git, since + * we have a very simple mmfile structure. + */ + t1.ptr = (char *)xe1->xdf2.recs[m->i1]->ptr; + t1.size = xe1->xdf2.recs[m->i1 + m->chg1]->ptr + + xe1->xdf2.recs[m->i1 + m->chg1]->size - t1.ptr; + t2.ptr = (char *)xe2->xdf2.recs[m->i1]->ptr; + t2.size = xe2->xdf2.recs[m->i1 + m->chg1]->ptr + + xe2->xdf2.recs[m->i1 + m->chg1]->size - t2.ptr; + if (xdl_do_diff(&t1, &t2, xpp, &xe) < 0) + return -1; + if (xdl_change_compact(&xe.xdf1, &xe.xdf2, xpp->flags) < 0 || + xdl_change_compact(&xe.xdf2, &xe.xdf1, xpp->flags) < 0 || + xdl_build_script(&xe, &xscr) < 0) { + xdl_free_env(&xe); + return -1; + } + if (!xscr) { + /* If this happens, it's a bug. */ + xdl_free_env(&xe); + return -2; + } + x = xscr; + m->i1 = xscr->i1 + i1; + m->chg1 = xscr->chg1; + m->i2 = xscr->i2 + i2; + m->chg2 = xscr->chg2; + while (xscr->next) { + xdmerge_t *m2 = xdl_malloc(sizeof(xdmerge_t)); + if (!m2) { + xdl_free_env(&xe); + xdl_free_script(x); + return -1; + } + xscr = xscr->next; + m2->next = m->next; + m->next = m2; + m = m2; + m->mode = 0; + m->i1 = xscr->i1 + i1; + m->chg1 = xscr->chg1; + m->i2 = xscr->i2 + i2; + m->chg2 = xscr->chg2; + } + xdl_free_env(&xe); + xdl_free_script(x); + } + return 0; +} + +/* + * level == 0: mark all overlapping changes as conflict + * level == 1: mark overlapping changes as conflict only if not identical + * level == 2: analyze non-identical changes for minimal conflict set + * + * returns < 0 on error, == 0 for no conflicts, else number of conflicts + */ +static int xdl_do_merge(xdfenv_t *xe1, xdchange_t *xscr1, const char *name1, + xdfenv_t *xe2, xdchange_t *xscr2, const char *name2, + int level, xpparam_t const *xpp, mmbuffer_t *result) { + xdmerge_t *changes, *c; + int i1, i2, chg1, chg2; + + c = changes = NULL; + + while (xscr1 && xscr2) { + if (!changes) + changes = c; + if (xscr1->i1 + xscr1->chg1 < xscr2->i1) { + i1 = xscr1->i2; + i2 = xscr2->i2 - xscr2->i1 + xscr1->i1; + chg1 = xscr1->chg2; + chg2 = xscr1->chg1; + if (xdl_append_merge(&c, 1, i1, chg1, i2, chg2)) { + xdl_cleanup_merge(changes); + return -1; + } + xscr1 = xscr1->next; + continue; + } + if (xscr2->i1 + xscr2->chg1 < xscr1->i1) { + i1 = xscr1->i2 - xscr1->i1 + xscr2->i1; + i2 = xscr2->i2; + chg1 = xscr2->chg1; + chg2 = xscr2->chg2; + if (xdl_append_merge(&c, 2, i1, chg1, i2, chg2)) { + xdl_cleanup_merge(changes); + return -1; + } + xscr2 = xscr2->next; + continue; + } + if (level < 1 || 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; + + i1 = xscr1->i2; + i2 = xscr2->i2; + if (off > 0) + i1 -= off; + else + i2 += off; + chg1 = xscr1->i2 + xscr1->chg2 - i1; + chg2 = xscr2->i2 + xscr2->chg2 - i2; + if (ffo > 0) + chg2 += ffo; + else + chg1 -= ffo; + if (xdl_append_merge(&c, 0, i1, chg1, i2, chg2)) { + xdl_cleanup_merge(changes); + return -1; + } + } + + i1 = xscr1->i1 + xscr1->chg1; + i2 = xscr2->i1 + xscr2->chg1; + + if (i1 > i2) { + xscr1->chg1 -= i1 - i2; + xscr1->i1 = i2; + xscr1->i2 += xscr1->chg2; + xscr1->chg2 = 0; + xscr1 = xscr1->next; + } else if (i2 > i1) { + xscr2->chg1 -= i2 - i1; + xscr2->i1 = i1; + xscr2->i2 += xscr2->chg2; + xscr2->chg2 = 0; + xscr2 = xscr2->next; + } else { + xscr1 = xscr1->next; + xscr2 = xscr2->next; + } + } + while (xscr1) { + if (!changes) + changes = c; + i1 = xscr1->i2; + i2 = xscr1->i1 + xe2->xdf2.nrec - xe2->xdf1.nrec; + chg1 = xscr1->chg2; + chg2 = xscr1->chg1; + if (xdl_append_merge(&c, 1, i1, chg1, i2, chg2)) { + xdl_cleanup_merge(changes); + return -1; + } + xscr1 = xscr1->next; + } + while (xscr2) { + if (!changes) + changes = c; + i1 = xscr2->i1 + xe1->xdf2.nrec - xe1->xdf1.nrec; + i2 = xscr2->i2; + chg1 = xscr2->chg1; + chg2 = xscr2->chg2; + if (xdl_append_merge(&c, 2, i1, chg1, i2, chg2)) { + xdl_cleanup_merge(changes); + return -1; + } + xscr2 = xscr2->next; + } + if (!changes) + changes = c; + /* refine conflicts */ + if (level > 1 && xdl_refine_conflicts(xe1, xe2, changes, xpp) < 0) { + xdl_cleanup_merge(changes); + return -1; + } + /* output */ + if (result) { + int size = xdl_fill_merge_buffer(xe1, name1, xe2, name2, + changes, NULL); + 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, changes, + result->ptr); + } + return xdl_cleanup_merge(changes); +} + +int xdl_merge(mmfile_t *orig, mmfile_t *mf1, const char *name1, + mmfile_t *mf2, const char *name2, + xpparam_t const *xpp, int level, mmbuffer_t *result) { + xdchange_t *xscr1, *xscr2; + xdfenv_t xe1, xe2; + + 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; + } + if (xscr1 || xscr2) { + 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 if (xdl_do_merge(&xe1, xscr1, name1, + &xe2, xscr2, name2, + level, xpp, result) < 0) { + xdl_free_script(xscr1); + xdl_free_script(xscr2); + xdl_free_env(&xe1); + xdl_free_env(&xe2); + return -1; + } + xdl_free_script(xscr1); + xdl_free_script(xscr2); + } + xdl_free_env(&xe1); + xdl_free_env(&xe2); + + return 0; +} + |