diff options
Diffstat (limited to 'xdiff')
| -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/xemit.c | 7 | ||||
| -rw-r--r-- | xdiff/xmacros.h | 5 | ||||
| -rw-r--r-- | xdiff/xmerge.c | 426 | ||||
| -rw-r--r-- | xdiff/xutils.c | 32 |
7 files changed, 455 insertions, 26 deletions
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/xemit.c b/xdiff/xemit.c index 714c56354..e291dc760 100644 --- a/xdiff/xemit.c +++ b/xdiff/xemit.c @@ -86,11 +86,10 @@ static void xdl_find_func(xdfile_t *xf, long i, char *buf, long sz, long *ll) { if (len > 0 && (isalpha((unsigned char)*rec) || /* identifier? */ *rec == '_' || /* also identifier? */ - *rec == '(' || /* lisp defun? */ - *rec == '#')) { /* #define? */ + *rec == '$')) { /* mysterious GNU diff's invention */ if (len > sz) len = sz; - if (len && rec[len - 1] == '\n') + while (0 < len && isspace((unsigned char)rec[len - 1])) len--; memcpy(buf, rec, len); *ll = len; @@ -119,7 +118,7 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb, xdemitconf_t const *xecfg) { long s1, s2, e1, e2, lctx; xdchange_t *xch, *xche; - char funcbuf[40]; + char funcbuf[80]; long funclen = 0; if (xecfg->flags & XDL_EMIT_COMMON) diff --git a/xdiff/xmacros.h b/xdiff/xmacros.h index 4c2fde80c..e2cd2023b 100644 --- a/xdiff/xmacros.h +++ b/xdiff/xmacros.h @@ -24,14 +24,15 @@ #define XMACROS_H -#define GR_PRIME 0x9e370001UL #define XDL_MIN(a, b) ((a) < (b) ? (a): (b)) #define XDL_MAX(a, b) ((a) > (b) ? (a): (b)) #define XDL_ABS(v) ((v) >= 0 ? (v): -(v)) #define XDL_ISDIGIT(c) ((c) >= '0' && (c) <= '9') -#define XDL_HASHLONG(v, b) (((unsigned long)(v) * GR_PRIME) >> ((CHAR_BIT * sizeof(unsigned long)) - (b))) +#define XDL_ADDBITS(v,b) ((v) + ((v) >> (b))) +#define XDL_MASKBITS(b) ((1UL << (b)) - 1) +#define XDL_HASHLONG(v,b) (XDL_ADDBITS((unsigned long)(v), b) & XDL_MASKBITS(b)) #define XDL_PTRFREE(p) do { if (p) { xdl_free(p); (p) = NULL; } } while (0) #define XDL_LE32_PUT(p, v) \ do { \ diff --git a/xdiff/xmerge.c b/xdiff/xmerge.c new file mode 100644 index 000000000..b83b3348c --- /dev/null +++ b/xdiff/xmerge.c @@ -0,0 +1,426 @@ +/* + * 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 && (i1 <= m->i1 + m->chg1 || i2 <= m->i2 + m->chg2)) { + if (mode != m->mode) + m->mode = 0; + 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); + else + continue; + 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; + + /* no sense refining a conflict when one side is empty */ + if (m->chg1 == 0 || m->chg2 == 0) + 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 - 1]->ptr + + xe1->xdf2.recs[m->i1 + m->chg1 - 1]->size - t1.ptr; + t2.ptr = (char *)xe2->xdf2.recs[m->i2]->ptr; + t2.size = xe2->xdf2.recs[m->i2 + m->chg2 - 1]->ptr + + xe2->xdf2.recs[m->i2 + m->chg2 - 1]->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, the changes are identical. */ + xdl_free_env(&xe); + m->mode = 4; + continue; + } + 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) + xscr2 = xscr2->next; + if (i2 >= i1) + xscr1 = xscr1->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; + int status; + + 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 || 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 { + status = xdl_do_merge(&xe1, xscr1, name1, + &xe2, xscr2, name2, + level, xpp, result); + } + xdl_free_script(xscr1); + xdl_free_script(xscr2); + } + xdl_free_env(&xe1); + xdl_free_env(&xe2); + + return status; +} diff --git a/xdiff/xutils.c b/xdiff/xutils.c index f7bdd395a..1b899f32c 100644 --- a/xdiff/xutils.c +++ b/xdiff/xutils.c @@ -191,36 +191,30 @@ int xdl_recmatch(const char *l1, long s1, const char *l2, long s2, long flags) int i1, i2; if (flags & XDF_IGNORE_WHITESPACE) { - for (i1 = i2 = 0; i1 < s1 && i2 < s2; i1++, i2++) { + for (i1 = i2 = 0; i1 < s1 && i2 < s2; ) { if (isspace(l1[i1])) while (isspace(l1[i1]) && i1 < s1) i1++; - else if (isspace(l2[i2])) + if (isspace(l2[i2])) while (isspace(l2[i2]) && i2 < s2) i2++; - else if (l1[i1] != l2[i2]) - return l2[i2] - l1[i1]; + if (i1 < s1 && i2 < s2 && l1[i1++] != l2[i2++]) + return 0; } - if (i1 >= s1) - return 1; - else if (i2 >= s2) - return -1; + return (i1 >= s1 && i2 >= s2); } else if (flags & XDF_IGNORE_WHITESPACE_CHANGE) { - for (i1 = i2 = 0; i1 < s1 && i2 < s2; i1++, i2++) { + for (i1 = i2 = 0; i1 < s1 && i2 < s2; ) { if (isspace(l1[i1])) { if (!isspace(l2[i2])) - return -1; + return 0; while (isspace(l1[i1]) && i1 < s1) i1++; while (isspace(l2[i2]) && i2 < s2) i2++; - } else if (l1[i1] != l2[i2]) - return l2[i2] - l1[i1]; + } else if (l1[i1++] != l2[i2++]) + return 0; } - if (i1 >= s1) - return 1; - else if (i2 >= s2) - return -1; + return (i1 >= s1 && i2 >= s2); } else return s1 == s2 && !memcmp(l1, l2, s1); @@ -233,9 +227,11 @@ unsigned long xdl_hash_record(char const **data, char const *top, long flags) { for (; ptr < top && *ptr != '\n'; ptr++) { if (isspace(*ptr) && (flags & XDF_WHITESPACE_FLAGS)) { - while (ptr < top && isspace(*ptr) && ptr[1] != '\n') + while (ptr + 1 < top && isspace(ptr[1]) + && ptr[1] != '\n') ptr++; - if (flags & XDF_IGNORE_WHITESPACE_CHANGE) { + if (flags & XDF_IGNORE_WHITESPACE_CHANGE + && ptr[1] != '\n') { ha += (ha << 5); ha ^= (unsigned long) ' '; } |