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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);

static int pickaxe_match(struct diff_filepair *p, struct diff_options *o,

regex_t *regexp, kwset_t kws, pickaxe_fn fn);

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;

}

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, &regmatch, 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, &regmatch, 0);

if (!two)

return !regexec(regexp, one->ptr, 1, &regmatch, 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 void diffcore_pickaxe_grep(struct diff_options *o)

{

int err;

regex_t regex;

int cflags = REG_EXTENDED | REG_NEWLINE;

if (DIFF_OPT_TST(o, PICKAXE_IGNORE_CASE))

cflags |= REG_ICASE;

err = regcomp(&regex, o->pickaxe, cflags);

if (err) {

char errbuf[1024];

regerror(err, &regex, errbuf, 1024);

regfree(&regex);

die("invalid regex: %s", errbuf);

}

pickaxe(&diff_queued_diff, o, &regex, NULL, diff_grep);

regfree(&regex);

return;

}

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, &regmatch, 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);

const char *found;

if (offset == -1)

break;

else

found = data + offset;

sz -= found - data + kwsm.size[0];

data = found + 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 diffcore_pickaxe_count(struct diff_options *o)

{

const char *needle = o->pickaxe;

int opts = o->pickaxe_opts;

unsigned long len = strlen(needle);

regex_t regex, *regexp = NULL;

kwset_t kws = NULL;

if (opts & DIFF_PICKAXE_REGEX) {

int err;

err = regcomp(&regex, needle, REG_EXTENDED | REG_NEWLINE);

if (err) {

/* The POSIX.2 people are surely sick */

char errbuf[1024];

regerror(err, &regex, errbuf, 1024);

regfree(&regex);

die("invalid regex: %s", errbuf);

}

regexp = &regex;

} else {

kws = kwsalloc(DIFF_OPT_TST(o, PICKAXE_IGNORE_CASE)

? tolower_trans_tbl : NULL);

kwsincr(kws, needle, len);

kwsprep(kws);

}

pickaxe(&diff_queued_diff, o, regexp, kws, has_changes);

if (opts & DIFF_PICKAXE_REGEX)

regfree(&regex);

else

kwsfree(kws);

return;

}

void diffcore_pickaxe(struct diff_options *o)

{

/* Might want to warn when both S and G are on; I don't care... */

if (o->pickaxe_opts & DIFF_PICKAXE_KIND_G)

diffcore_pickaxe_grep(o);

else

diffcore_pickaxe_count(o);

}