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![Jeff King](/assets/img/avatar_default.png)
The logic flow of has_changes() used for "log -S" and diff_grep() used for "log -G" are essentially the same. See if we have both sides that could be different in any interesting way, slurp the contents in core, possibly after applying textconv, inspect the contents, clean-up and report the result. The only difference between the two is how "inspect" step works. Unify this codeflow in a helper, pickaxe_match(), which takes a callback function that implements the specific "inspect" step. After removing the common scaffolding code from the existing has_changes() and diff_grep(), they each becomes such a callback function suitable for passing to pickaxe_match(). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
276 lines
6.5 KiB
C
276 lines
6.5 KiB
C
/*
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* Copyright (C) 2005 Junio C Hamano
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* Copyright (C) 2010 Google Inc.
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*/
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#include "cache.h"
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#include "diff.h"
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#include "diffcore.h"
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#include "xdiff-interface.h"
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#include "kwset.h"
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typedef int (*pickaxe_fn)(mmfile_t *one, mmfile_t *two,
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struct diff_options *o,
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regex_t *regexp, kwset_t kws);
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static int pickaxe_match(struct diff_filepair *p, struct diff_options *o,
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regex_t *regexp, kwset_t kws, pickaxe_fn fn);
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static void pickaxe(struct diff_queue_struct *q, struct diff_options *o,
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regex_t *regexp, kwset_t kws, pickaxe_fn fn)
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{
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int i;
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struct diff_queue_struct outq;
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DIFF_QUEUE_CLEAR(&outq);
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if (o->pickaxe_opts & DIFF_PICKAXE_ALL) {
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/* Showing the whole changeset if needle exists */
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for (i = 0; i < q->nr; i++) {
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struct diff_filepair *p = q->queue[i];
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if (pickaxe_match(p, o, regexp, kws, fn))
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return; /* do not munge the queue */
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}
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/*
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* Otherwise we will clear the whole queue by copying
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* the empty outq at the end of this function, but
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* first clear the current entries in the queue.
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*/
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for (i = 0; i < q->nr; i++)
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diff_free_filepair(q->queue[i]);
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} else {
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/* Showing only the filepairs that has the needle */
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for (i = 0; i < q->nr; i++) {
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struct diff_filepair *p = q->queue[i];
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if (pickaxe_match(p, o, regexp, kws, fn))
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diff_q(&outq, p);
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else
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diff_free_filepair(p);
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}
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}
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free(q->queue);
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*q = outq;
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}
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struct diffgrep_cb {
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regex_t *regexp;
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int hit;
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};
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static void diffgrep_consume(void *priv, char *line, unsigned long len)
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{
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struct diffgrep_cb *data = priv;
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regmatch_t regmatch;
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int hold;
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if (line[0] != '+' && line[0] != '-')
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return;
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if (data->hit)
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/*
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* NEEDSWORK: we should have a way to terminate the
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* caller early.
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*/
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return;
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/* Yuck -- line ought to be "const char *"! */
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hold = line[len];
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line[len] = '\0';
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data->hit = !regexec(data->regexp, line + 1, 1, ®match, 0);
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line[len] = hold;
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}
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static int diff_grep(mmfile_t *one, mmfile_t *two,
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struct diff_options *o,
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regex_t *regexp, kwset_t kws)
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{
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regmatch_t regmatch;
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struct diffgrep_cb ecbdata;
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xpparam_t xpp;
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xdemitconf_t xecfg;
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if (!one)
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return !regexec(regexp, two->ptr, 1, ®match, 0);
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if (!two)
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return !regexec(regexp, one->ptr, 1, ®match, 0);
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/*
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* We have both sides; need to run textual diff and see if
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* the pattern appears on added/deleted lines.
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*/
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memset(&xpp, 0, sizeof(xpp));
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memset(&xecfg, 0, sizeof(xecfg));
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ecbdata.regexp = regexp;
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ecbdata.hit = 0;
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xecfg.ctxlen = o->context;
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xecfg.interhunkctxlen = o->interhunkcontext;
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xdi_diff_outf(one, two, diffgrep_consume, &ecbdata,
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&xpp, &xecfg);
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return ecbdata.hit;
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}
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static void diffcore_pickaxe_grep(struct diff_options *o)
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{
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int err;
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regex_t regex;
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int cflags = REG_EXTENDED | REG_NEWLINE;
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if (DIFF_OPT_TST(o, PICKAXE_IGNORE_CASE))
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cflags |= REG_ICASE;
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err = regcomp(®ex, o->pickaxe, cflags);
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if (err) {
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char errbuf[1024];
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regerror(err, ®ex, errbuf, 1024);
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regfree(®ex);
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die("invalid log-grep regex: %s", errbuf);
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}
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pickaxe(&diff_queued_diff, o, ®ex, NULL, diff_grep);
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regfree(®ex);
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return;
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}
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static unsigned int contains(mmfile_t *mf, struct diff_options *o,
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regex_t *regexp, kwset_t kws)
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{
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unsigned int cnt;
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unsigned long sz;
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const char *data;
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sz = mf->size;
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data = mf->ptr;
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cnt = 0;
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if (regexp) {
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regmatch_t regmatch;
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int flags = 0;
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assert(data[sz] == '\0');
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while (*data && !regexec(regexp, data, 1, ®match, flags)) {
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flags |= REG_NOTBOL;
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data += regmatch.rm_eo;
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if (*data && regmatch.rm_so == regmatch.rm_eo)
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data++;
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cnt++;
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}
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} else { /* Classic exact string match */
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while (sz) {
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struct kwsmatch kwsm;
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size_t offset = kwsexec(kws, data, sz, &kwsm);
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const char *found;
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if (offset == -1)
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break;
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else
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found = data + offset;
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sz -= found - data + kwsm.size[0];
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data = found + kwsm.size[0];
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cnt++;
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}
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}
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return cnt;
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}
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static int has_changes(mmfile_t *one, mmfile_t *two,
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struct diff_options *o,
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regex_t *regexp, kwset_t kws)
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{
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if (!one)
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return contains(two, o, regexp, kws) != 0;
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if (!two)
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return contains(one, o, regexp, kws) != 0;
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return contains(one, o, regexp, kws) != contains(two, o, regexp, kws);
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}
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static int pickaxe_match(struct diff_filepair *p, struct diff_options *o,
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regex_t *regexp, kwset_t kws, pickaxe_fn fn)
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{
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struct userdiff_driver *textconv_one = NULL;
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struct userdiff_driver *textconv_two = NULL;
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mmfile_t mf1, mf2;
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int ret;
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if (!o->pickaxe[0])
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return 0;
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/* ignore unmerged */
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if (!DIFF_FILE_VALID(p->one) && !DIFF_FILE_VALID(p->two))
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return 0;
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if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
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textconv_one = get_textconv(p->one);
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textconv_two = get_textconv(p->two);
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}
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/*
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* If we have an unmodified pair, we know that the count will be the
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* same and don't even have to load the blobs. Unless textconv is in
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* play, _and_ we are using two different textconv filters (e.g.,
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* because a pair is an exact rename with different textconv attributes
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* for each side, which might generate different content).
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*/
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if (textconv_one == textconv_two && diff_unmodified_pair(p))
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return 0;
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mf1.size = fill_textconv(textconv_one, p->one, &mf1.ptr);
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mf2.size = fill_textconv(textconv_two, p->two, &mf2.ptr);
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ret = fn(DIFF_FILE_VALID(p->one) ? &mf1 : NULL,
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DIFF_FILE_VALID(p->two) ? &mf2 : NULL,
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o, regexp, kws);
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if (textconv_one)
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free(mf1.ptr);
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if (textconv_two)
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free(mf2.ptr);
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diff_free_filespec_data(p->one);
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diff_free_filespec_data(p->two);
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return ret;
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}
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static void diffcore_pickaxe_count(struct diff_options *o)
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{
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const char *needle = o->pickaxe;
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int opts = o->pickaxe_opts;
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unsigned long len = strlen(needle);
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regex_t regex, *regexp = NULL;
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kwset_t kws = NULL;
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if (opts & DIFF_PICKAXE_REGEX) {
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int err;
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err = regcomp(®ex, needle, REG_EXTENDED | REG_NEWLINE);
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if (err) {
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/* The POSIX.2 people are surely sick */
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char errbuf[1024];
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regerror(err, ®ex, errbuf, 1024);
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regfree(®ex);
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die("invalid pickaxe regex: %s", errbuf);
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}
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regexp = ®ex;
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} else {
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kws = kwsalloc(DIFF_OPT_TST(o, PICKAXE_IGNORE_CASE)
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? tolower_trans_tbl : NULL);
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kwsincr(kws, needle, len);
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kwsprep(kws);
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}
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pickaxe(&diff_queued_diff, o, regexp, kws, has_changes);
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if (opts & DIFF_PICKAXE_REGEX)
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regfree(®ex);
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else
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kwsfree(kws);
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return;
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}
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void diffcore_pickaxe(struct diff_options *o)
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{
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/* Might want to warn when both S and G are on; I don't care... */
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if (o->pickaxe_opts & DIFF_PICKAXE_KIND_G)
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diffcore_pickaxe_grep(o);
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else
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diffcore_pickaxe_count(o);
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}
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