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diffcore-pickaxe.c
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/* * Copyright (C) 2005 Junio C Hamano * Copyright (C) 2010 Google Inc. */ #include "cache.h" #include "diff.h" #include "diffcore.h" #include "xdiff-interface.h" #include "kwset.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 void diffgrep_consume(void *priv, char *line, unsigned long len) { struct diffgrep_cb *data = priv; regmatch_t regmatch; int hold; if (line[0] != '+' && line[0] != '-') return; if (data->hit) /* * NEEDSWORK: we should have a way to terminate the * caller early. */ return; /* Yuck -- line ought to be "const char *"! */ hold = line[len]; line[len] = '\0'; data->hit = !regexec(data->regexp, line + 1, 1, ®match, 0); line[len] = hold; } static int diff_grep(mmfile_t *one, mmfile_t *two, struct diff_options *o, regex_t *regexp, kwset_t kws) { regmatch_t regmatch; struct diffgrep_cb ecbdata; xpparam_t xpp; xdemitconf_t xecfg; if (!one) return !regexec(regexp, two->ptr, 1, ®match, 0); if (!two) return !regexec(regexp, one->ptr, 1, ®match, 0); /* * 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.ctxlen = o->context; xecfg.interhunkctxlen = o->interhunkcontext; xdi_diff_outf(one, two, diffgrep_consume, &ecbdata, &xpp, &xecfg); return ecbdata.hit; } static unsigned int contains(mmfile_t *mf, regex_t *regexp, kwset_t kws) { unsigned int cnt; unsigned long sz; const char *data; sz = mf->size; data = mf->ptr; cnt = 0; if (regexp) { regmatch_t regmatch; int flags = 0; assert(data[sz] == '\0'); while (*data && !regexec(regexp, data, 1, ®match, flags)) { flags |= REG_NOTBOL; data += regmatch.rm_eo; if (*data && regmatch.rm_so == regmatch.rm_eo) data++; 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++; } } return cnt; } static int has_changes(mmfile_t *one, mmfile_t *two, struct diff_options *o, regex_t *regexp, kwset_t kws) { unsigned int one_contains = one ? contains(one, regexp, kws) : 0; unsigned int two_contains = two ? contains(two, regexp, kws) : 0; return one_contains != two_contains; } 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; if (!o->pickaxe[0]) return 0; /* ignore unmerged */ if (!DIFF_FILE_VALID(p->one) && !DIFF_FILE_VALID(p->two)) return 0; if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) { textconv_one = get_textconv(p->one); textconv_two = get_textconv(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; mf1.size = fill_textconv(textconv_one, p->one, &mf1.ptr); mf2.size = fill_textconv(textconv_two, p->two, &mf2.ptr); ret = fn(DIFF_FILE_VALID(p->one) ? &mf1 : NULL, DIFF_FILE_VALID(p->two) ? &mf2 : NULL, 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_CLEAR(&outq); 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; } 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; if (opts & (DIFF_PICKAXE_REGEX | DIFF_PICKAXE_KIND_G)) { int err; int cflags = REG_EXTENDED | REG_NEWLINE; if (DIFF_OPT_TST(o, PICKAXE_IGNORE_CASE)) cflags |= REG_ICASE; err = regcomp(®ex, needle, cflags); if (err) { /* The POSIX.2 people are surely sick */ char errbuf[1024]; regerror(err, ®ex, errbuf, 1024); regfree(®ex); die("invalid regex: %s", errbuf); } regexp = ®ex; } else { kws = kwsalloc(DIFF_OPT_TST(o, PICKAXE_IGNORE_CASE) ? tolower_trans_tbl : NULL); kwsincr(kws, needle, strlen(needle)); kwsprep(kws); } /* Might want to warn when both S and G are on; I don't care... */ pickaxe(&diff_queued_diff, o, regexp, kws, (opts & DIFF_PICKAXE_KIND_G) ? diff_grep : has_changes); if (regexp) regfree(regexp); else kwsfree(kws); return; }
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