| /* |
| * Copyright (C) 2005 Junio C Hamano |
| * Copyright (C) 2010 Google Inc. |
| */ |
| #include "git-compat-util.h" |
| #include "diff.h" |
| #include "diffcore.h" |
| #include "xdiff-interface.h" |
| #include "kwset.h" |
| #include "oidset.h" |
| #include "pretty.h" |
| #include "quote.h" |
| |
| typedef int (*pickaxe_fn)(mmfile_t *one, mmfile_t *two, |
| struct diff_options *o, |
| regex_t *regexp, kwset_t kws); |
| |
| struct diffgrep_cb { |
| regex_t *regexp; |
| int hit; |
| }; |
| |
| static int diffgrep_consume(void *priv, char *line, unsigned long len) |
| { |
| struct diffgrep_cb *data = priv; |
| regmatch_t regmatch; |
| |
| if (line[0] != '+' && line[0] != '-') |
| return 0; |
| if (data->hit) |
| BUG("Already matched in diffgrep_consume! Broken xdiff_emit_line_fn?"); |
| if (!regexec_buf(data->regexp, line + 1, len - 1, 1, |
| ®match, 0)) { |
| data->hit = 1; |
| return 1; |
| } |
| return 0; |
| } |
| |
| static int diff_grep(mmfile_t *one, mmfile_t *two, |
| struct diff_options *o, |
| regex_t *regexp, kwset_t kws UNUSED) |
| { |
| struct diffgrep_cb ecbdata; |
| xpparam_t xpp; |
| xdemitconf_t xecfg; |
| int ret; |
| |
| /* |
| * We have both sides; need to run textual diff and see if |
| * the pattern appears on added/deleted lines. |
| */ |
| memset(&xpp, 0, sizeof(xpp)); |
| memset(&xecfg, 0, sizeof(xecfg)); |
| ecbdata.regexp = regexp; |
| ecbdata.hit = 0; |
| xecfg.flags = XDL_EMIT_NO_HUNK_HDR; |
| xecfg.ctxlen = o->context; |
| xecfg.interhunkctxlen = o->interhunkcontext; |
| |
| /* |
| * An xdiff error might be our "data->hit" from above. See the |
| * comment for xdiff_emit_line_fn in xdiff-interface.h |
| */ |
| ret = xdi_diff_outf(one, two, NULL, diffgrep_consume, |
| &ecbdata, &xpp, &xecfg); |
| if (ecbdata.hit) |
| return 1; |
| if (ret) |
| return ret; |
| return 0; |
| } |
| |
| static unsigned int contains(mmfile_t *mf, regex_t *regexp, kwset_t kws, |
| unsigned int limit) |
| { |
| unsigned int cnt = 0; |
| unsigned long sz = mf->size; |
| const char *data = mf->ptr; |
| |
| if (regexp) { |
| regmatch_t regmatch; |
| int flags = 0; |
| |
| while (sz && |
| !regexec_buf(regexp, data, sz, 1, ®match, flags)) { |
| flags |= REG_NOTBOL; |
| data += regmatch.rm_eo; |
| sz -= regmatch.rm_eo; |
| if (sz && regmatch.rm_so == regmatch.rm_eo) { |
| data++; |
| sz--; |
| } |
| cnt++; |
| |
| if (limit && cnt == limit) |
| return cnt; |
| } |
| |
| } else { /* Classic exact string match */ |
| while (sz) { |
| struct kwsmatch kwsm; |
| size_t offset = kwsexec(kws, data, sz, &kwsm); |
| if (offset == -1) |
| break; |
| sz -= offset + kwsm.size[0]; |
| data += offset + kwsm.size[0]; |
| cnt++; |
| |
| if (limit && cnt == limit) |
| return cnt; |
| } |
| } |
| return cnt; |
| } |
| |
| static int has_changes(mmfile_t *one, mmfile_t *two, |
| struct diff_options *o UNUSED, |
| regex_t *regexp, kwset_t kws) |
| { |
| unsigned int c1 = one ? contains(one, regexp, kws, 0) : 0; |
| unsigned int c2 = two ? contains(two, regexp, kws, c1 + 1) : 0; |
| return c1 != c2; |
| } |
| |
| static int pickaxe_match(struct diff_filepair *p, struct diff_options *o, |
| regex_t *regexp, kwset_t kws, pickaxe_fn fn) |
| { |
| struct userdiff_driver *textconv_one = NULL; |
| struct userdiff_driver *textconv_two = NULL; |
| mmfile_t mf1, mf2; |
| int ret; |
| |
| /* ignore unmerged */ |
| if (!DIFF_FILE_VALID(p->one) && !DIFF_FILE_VALID(p->two)) |
| return 0; |
| |
| if (o->objfind) { |
| return (DIFF_FILE_VALID(p->one) && |
| oidset_contains(o->objfind, &p->one->oid)) || |
| (DIFF_FILE_VALID(p->two) && |
| oidset_contains(o->objfind, &p->two->oid)); |
| } |
| |
| if (o->flags.allow_textconv) { |
| textconv_one = get_textconv(o->repo, p->one); |
| textconv_two = get_textconv(o->repo, p->two); |
| } |
| |
| /* |
| * If we have an unmodified pair, we know that the count will be the |
| * same and don't even have to load the blobs. Unless textconv is in |
| * play, _and_ we are using two different textconv filters (e.g., |
| * because a pair is an exact rename with different textconv attributes |
| * for each side, which might generate different content). |
| */ |
| if (textconv_one == textconv_two && diff_unmodified_pair(p)) |
| return 0; |
| |
| if ((o->pickaxe_opts & DIFF_PICKAXE_KIND_G) && |
| !o->flags.text && |
| ((!textconv_one && diff_filespec_is_binary(o->repo, p->one)) || |
| (!textconv_two && diff_filespec_is_binary(o->repo, p->two)))) |
| return 0; |
| |
| mf1.size = fill_textconv(o->repo, textconv_one, p->one, &mf1.ptr); |
| mf2.size = fill_textconv(o->repo, textconv_two, p->two, &mf2.ptr); |
| |
| ret = fn(&mf1, &mf2, o, regexp, kws); |
| |
| if (textconv_one) |
| free(mf1.ptr); |
| if (textconv_two) |
| free(mf2.ptr); |
| diff_free_filespec_data(p->one); |
| diff_free_filespec_data(p->two); |
| |
| return ret; |
| } |
| |
| static void pickaxe(struct diff_queue_struct *q, struct diff_options *o, |
| regex_t *regexp, kwset_t kws, pickaxe_fn fn) |
| { |
| int i; |
| struct diff_queue_struct outq = DIFF_QUEUE_INIT; |
| |
| if (o->pickaxe_opts & DIFF_PICKAXE_ALL) { |
| /* Showing the whole changeset if needle exists */ |
| for (i = 0; i < q->nr; i++) { |
| struct diff_filepair *p = q->queue[i]; |
| if (pickaxe_match(p, o, regexp, kws, fn)) |
| return; /* do not munge the queue */ |
| } |
| |
| /* |
| * Otherwise we will clear the whole queue by copying |
| * the empty outq at the end of this function, but |
| * first clear the current entries in the queue. |
| */ |
| for (i = 0; i < q->nr; i++) |
| diff_free_filepair(q->queue[i]); |
| } else { |
| /* Showing only the filepairs that has the needle */ |
| for (i = 0; i < q->nr; i++) { |
| struct diff_filepair *p = q->queue[i]; |
| if (pickaxe_match(p, o, regexp, kws, fn)) |
| diff_q(&outq, p); |
| else |
| diff_free_filepair(p); |
| } |
| } |
| |
| free(q->queue); |
| *q = outq; |
| } |
| |
| static void regcomp_or_die(regex_t *regex, const char *needle, int cflags) |
| { |
| int err = regcomp(regex, needle, cflags); |
| if (err) { |
| /* The POSIX.2 people are surely sick */ |
| char errbuf[1024]; |
| regerror(err, regex, errbuf, 1024); |
| die("invalid regex: %s", errbuf); |
| } |
| } |
| |
| void diffcore_pickaxe(struct diff_options *o) |
| { |
| const char *needle = o->pickaxe; |
| int opts = o->pickaxe_opts; |
| regex_t regex, *regexp = NULL; |
| kwset_t kws = NULL; |
| pickaxe_fn fn; |
| |
| if (opts & ~DIFF_PICKAXE_KIND_OBJFIND && |
| (!needle || !*needle)) |
| BUG("should have needle under -G or -S"); |
| if (opts & (DIFF_PICKAXE_REGEX | DIFF_PICKAXE_KIND_G)) { |
| int cflags = REG_EXTENDED | REG_NEWLINE; |
| if (o->pickaxe_opts & DIFF_PICKAXE_IGNORE_CASE) |
| cflags |= REG_ICASE; |
| regcomp_or_die(®ex, needle, cflags); |
| regexp = ®ex; |
| |
| if (opts & DIFF_PICKAXE_KIND_G) |
| fn = diff_grep; |
| else if (opts & DIFF_PICKAXE_REGEX) |
| fn = has_changes; |
| else |
| /* |
| * We don't need to check the combination of |
| * -G and --pickaxe-regex, by the time we get |
| * here diff.c has already died if they're |
| * combined. See the usage tests in |
| * t4209-log-pickaxe.sh. |
| */ |
| BUG("unreachable"); |
| } else if (opts & DIFF_PICKAXE_KIND_S) { |
| if (o->pickaxe_opts & DIFF_PICKAXE_IGNORE_CASE && |
| has_non_ascii(needle)) { |
| struct strbuf sb = STRBUF_INIT; |
| int cflags = REG_NEWLINE | REG_ICASE; |
| |
| basic_regex_quote_buf(&sb, needle); |
| regcomp_or_die(®ex, sb.buf, cflags); |
| strbuf_release(&sb); |
| regexp = ®ex; |
| } else { |
| kws = kwsalloc(o->pickaxe_opts & DIFF_PICKAXE_IGNORE_CASE |
| ? tolower_trans_tbl : NULL); |
| kwsincr(kws, needle, strlen(needle)); |
| kwsprep(kws); |
| } |
| fn = has_changes; |
| } else if (opts & DIFF_PICKAXE_KIND_OBJFIND) { |
| fn = NULL; |
| } else { |
| BUG("unknown pickaxe_opts flag"); |
| } |
| |
| pickaxe(&diff_queued_diff, o, regexp, kws, fn); |
| |
| if (regexp) |
| regfree(regexp); |
| if (kws) |
| kwsfree(kws); |
| return; |
| } |