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Merge branch 'jk/xdiff-interface' 

The interface into "xdiff" library used to discover the offset and
size of a generated patch hunk by first formatting it into the
textual hunk header "@@ -n,m +k,l @@" and then parsing the numbers
out.  A new interface has been introduced to allow callers a more
direct access to them.

* jk/xdiff-interface:
  xdiff-interface: drop parse_hunk_header()
  range-diff: use a hunk callback
  diff: convert --check to use a hunk callback
  combine-diff: use an xdiff hunk callback
  diff: use hunk callback for word-diff
  diff: discard hunk headers for patch-ids earlier
  diff: avoid generating unused hunk header lines
  xdiff-interface: provide a separate consume callback for hunks
  xdiff: provide a separate emit callback for hunks
This commit is contained in:
Junio C Hamano 2018-11-13 22:37:27 +09:00
parent f22838aa7a 5eade0746e
commit 39d23dfa40
10 changed files with 143 additions and 115 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
builtin/merge-tree.c
View File

@ -110,7 +110,8 @@ static void show_diff(struct merge_list *entry)
xpp.flags = 0;
memset(&xecfg, 0, sizeof(xecfg));
xecfg.ctxlen = 3;
ecb.outf = show_outf;
ecb.out_hunk = NULL;
ecb.out_line = show_outf;
ecb.priv = NULL;
src.ptr = origin(entry, &size);

3
builtin/rerere.c
View File

@ -41,7 +41,8 @@ static int diff_two(const char *file1, const char *label1,
xpp.flags = 0;
memset(&xecfg, 0, sizeof(xecfg));
xecfg.ctxlen = 3;
ecb.outf = outf;
ecb.out_hunk = NULL;
ecb.out_line = outf;
ret = xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
free(minus.ptr);

67
combine-diff.c
View File

@ -345,38 +345,43 @@ struct combine_diff_state {
struct sline *lost_bucket;
};
static void consume_hunk(void *state_,
long ob, long on,
long nb, long nn,
const char *funcline, long funclen)
{
struct combine_diff_state *state = state_;
state->ob = ob;
state->on = on;
state->nb = nb;
state->nn = nn;
state->lno = state->nb;
if (state->nn == 0) {
/* @@ -X,Y +N,0 @@ removed Y lines
* that would have come *after* line N
* in the result. Our lost buckets hang
* to the line after the removed lines,
*
* Note that this is correct even when N == 0,
* in which case the hunk removes the first
* line in the file.
*/
state->lost_bucket = &state->sline[state->nb];
if (!state->nb)
state->nb = 1;
} else {
state->lost_bucket = &state->sline[state->nb-1];
}
if (!state->sline[state->nb-1].p_lno)
state->sline[state->nb-1].p_lno =
xcalloc(state->num_parent, sizeof(unsigned long));
state->sline[state->nb-1].p_lno[state->n] = state->ob;
}
static void consume_line(void *state_, char *line, unsigned long len)
{
struct combine_diff_state *state = state_;
if (5 < len && !memcmp("@@ -", line, 4)) {
if (parse_hunk_header(line, len,
&state->ob, &state->on,
&state->nb, &state->nn))
return;
state->lno = state->nb;
if (state->nn == 0) {
/* @@ -X,Y +N,0 @@ removed Y lines
* that would have come *after* line N
* in the result. Our lost buckets hang
* to the line after the removed lines,
*
* Note that this is correct even when N == 0,
* in which case the hunk removes the first
* line in the file.
*/
state->lost_bucket = &state->sline[state->nb];
if (!state->nb)
state->nb = 1;
} else {
state->lost_bucket = &state->sline[state->nb-1];
}
if (!state->sline[state->nb-1].p_lno)
state->sline[state->nb-1].p_lno =
xcalloc(state->num_parent,
sizeof(unsigned long));
state->sline[state->nb-1].p_lno[state->n] = state->ob;
return;
}
if (!state->lost_bucket)
return; /* not in any hunk yet */
switch (line[0]) {
@ -421,8 +426,8 @@ static void combine_diff(struct repository *r,
state.num_parent = num_parent;
state.n = n;
if (xdi_diff_outf(&parent_file, result_file, consume_line, &state,
&xpp, &xecfg))
if (xdi_diff_outf(&parent_file, result_file, consume_hunk,
consume_line, &state, &xpp, &xecfg))
die("unable to generate combined diff for %s",
oid_to_hex(parent));
free(parent_file.ptr);

48
diff.c
View File

@ -1912,19 +1912,17 @@ static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
}
}
static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
static void fn_out_diff_words_aux(void *priv,
long minus_first, long minus_len,
long plus_first, long plus_len,
const char *func, long funclen)
{
struct diff_words_data *diff_words = priv;
struct diff_words_style *style = diff_words->style;
int minus_first, minus_len, plus_first, plus_len;
const char *minus_begin, *minus_end, *plus_begin, *plus_end;
struct diff_options *opt = diff_words->opt;
const char *line_prefix;
if (line[0] != '@' || parse_hunk_header(line, len,
&minus_first, &minus_len, &plus_first, &plus_len))
return;
assert(opt);
line_prefix = diff_line_prefix(opt);
@ -2074,8 +2072,8 @@ static void diff_words_show(struct diff_words_data *diff_words)
xpp.flags = 0;
/* as only the hunk header will be parsed, we need a 0-context */
xecfg.ctxlen = 0;
if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
&xpp, &xecfg))
if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, NULL,
diff_words, &xpp, &xecfg))
die("unable to generate word diff");
free(minus.ptr);
free(plus.ptr);
@ -3130,6 +3128,15 @@ static int is_conflict_marker(const char *line, int marker_size, unsigned long l
return 1;
}
static void checkdiff_consume_hunk(void *priv,
long ob, long on, long nb, long nn,
const char *func, long funclen)
{
struct checkdiff_t *data = priv;
data->lineno = nb - 1;
}
static void checkdiff_consume(void *priv, char *line, unsigned long len)
{
struct checkdiff_t *data = priv;
@ -3165,12 +3172,6 @@ static void checkdiff_consume(void *priv, char *line, unsigned long len)
data->o->file, set, reset, ws);
} else if (line[0] == ' ') {
data->lineno++;
} else if (line[0] == '@') {
char *plus = strchr(line, '+');
if (plus)
data->lineno = strtol(plus, NULL, 10) - 1;
else
die("invalid diff");
}
}
@ -3526,8 +3527,8 @@ static void builtin_diff(const char *name_a,
xecfg.ctxlen = strtoul(v, NULL, 10);
if (o->word_diff)
init_diff_words_data(&ecbdata, o, one, two);
if (xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
&xpp, &xecfg))
if (xdi_diff_outf(&mf1, &mf2, NULL, fn_out_consume,
&ecbdata, &xpp, &xecfg))
die("unable to generate diff for %s", one->path);
if (o->word_diff)
free_diff_words_data(&ecbdata);
@ -3637,8 +3638,8 @@ static void builtin_diffstat(const char *name_a, const char *name_b,
xpp.anchors_nr = o->anchors_nr;
xecfg.ctxlen = o->context;
xecfg.interhunkctxlen = o->interhunkcontext;
if (xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
&xpp, &xecfg))
if (xdi_diff_outf(&mf1, &mf2, discard_hunk_line,
diffstat_consume, diffstat, &xpp, &xecfg))
die("unable to generate diffstat for %s", one->path);
}
@ -3686,7 +3687,8 @@ static void builtin_checkdiff(const char *name_a, const char *name_b,
memset(&xecfg, 0, sizeof(xecfg));
xecfg.ctxlen = 1; /* at least one context line */
xpp.flags = 0;
if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume_hunk,
checkdiff_consume, &data,
&xpp, &xecfg))
die("unable to generate checkdiff for %s", one->path);
@ -5666,10 +5668,6 @@ static void patch_id_consume(void *priv, char *line, unsigned long len)
struct patch_id_t *data = priv;
int new_len;
/* Ignore line numbers when computing the SHA1 of the patch */
if (starts_with(line, "@@ -"))
return;
new_len = remove_space(line, len);
git_SHA1_Update(data->ctx, line, new_len);
@ -5771,8 +5769,8 @@ static int diff_get_patch_id(struct diff_options *options, struct object_id *oid
xpp.flags = 0;
xecfg.ctxlen = 3;
xecfg.flags = 0;
if (xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
&xpp, &xecfg))
if (xdi_diff_outf(&mf1, &mf2, discard_hunk_line,
patch_id_consume, &data, &xpp, &xecfg))
return error("unable to generate patch-id diff for %s",
p->one->path);
}

3
diffcore-pickaxe.c
View File

@ -62,7 +62,8 @@ static int diff_grep(mmfile_t *one, mmfile_t *two,
ecbdata.hit = 0;
xecfg.ctxlen = o->context;
xecfg.interhunkctxlen = o->interhunkcontext;
if (xdi_diff_outf(one, two, diffgrep_consume, &ecbdata, &xpp, &xecfg))
if (xdi_diff_outf(one, two, discard_hunk_line, diffgrep_consume,
&ecbdata, &xpp, &xecfg))
return 0;
return ecbdata.hit;
}

10
range-diff.c
View File

@ -197,6 +197,12 @@ static void diffsize_consume(void *data, char *line, unsigned long len)
(*(int *)data)++;
}
static void diffsize_hunk(void *data, long ob, long on, long nb, long nn,
const char *funcline, long funclen)
{
diffsize_consume(data, NULL, 0);
}
static int diffsize(const char *a, const char *b)
{
xpparam_t pp = { 0 };
@ -210,7 +216,9 @@ static int diffsize(const char *a, const char *b)
mf2.size = strlen(b);
cfg.ctxlen = 3;
if (!xdi_diff_outf(&mf1, &mf2, diffsize_consume, &count, &pp, &cfg))
if (!xdi_diff_outf(&mf1, &mf2,
diffsize_hunk, diffsize_consume, &count,
&pp, &cfg))
return count;
error(_("failed to generate diff"));

76
xdiff-interface.c
View File

@ -9,56 +9,28 @@
#include "xdiff/xutils.h"
struct xdiff_emit_state {
xdiff_emit_consume_fn consume;
xdiff_emit_hunk_fn hunk_fn;
xdiff_emit_line_fn line_fn;
void *consume_callback_data;
struct strbuf remainder;
};
static int parse_num(char **cp_p, int *num_p)
static int xdiff_out_hunk(void *priv_,
long old_begin, long old_nr,
long new_begin, long new_nr,
const char *func, long funclen)
{
char *cp = *cp_p;
int num = 0;
struct xdiff_emit_state *priv = priv_;
while ('0' <= *cp && *cp <= '9')
num = num * 10 + *cp++ - '0';
if (!(cp - *cp_p))
return -1;
*cp_p = cp;
*num_p = num;
if (priv->remainder.len)
BUG("xdiff emitted hunk in the middle of a line");
priv->hunk_fn(priv->consume_callback_data,
old_begin, old_nr, new_begin, new_nr,
func, funclen);
return 0;
}
int parse_hunk_header(char *line, int len,
int *ob, int *on,
int *nb, int *nn)
{
char *cp;
cp = line + 4;
if (parse_num(&cp, ob)) {
bad_line:
return error("malformed diff output: %s", line);
}
if (*cp == ',') {
cp++;
if (parse_num(&cp, on))
goto bad_line;
}
else
*on = 1;
if (*cp++ != ' ' || *cp++ != '+')
goto bad_line;
if (parse_num(&cp, nb))
goto bad_line;
if (*cp == ',') {
cp++;
if (parse_num(&cp, nn))
goto bad_line;
}
else
*nn = 1;
return -!!memcmp(cp, " @@", 3);
}
static void consume_one(void *priv_, char *s, unsigned long size)
{
struct xdiff_emit_state *priv = priv_;
@ -67,7 +39,7 @@ static void consume_one(void *priv_, char *s, unsigned long size)
unsigned long this_size;
ep = memchr(s, '\n', size);
this_size = (ep == NULL) ? size : (ep - s + 1);
priv->consume(priv->consume_callback_data, s, this_size);
priv->line_fn(priv->consume_callback_data, s, this_size);
size -= this_size;
s += this_size;
}
@ -78,6 +50,9 @@ static int xdiff_outf(void *priv_, mmbuffer_t *mb, int nbuf)
struct xdiff_emit_state *priv = priv_;
int i;
if (!priv->line_fn)
return 0;
for (i = 0; i < nbuf; i++) {
if (mb[i].ptr[mb[i].size-1] != '\n') {
/* Incomplete line */
@ -140,8 +115,16 @@ int xdi_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp, xdemitconf_t co
return xdl_diff(&a, &b, xpp, xecfg, xecb);
}
void discard_hunk_line(void *priv,
long ob, long on, long nb, long nn,
const char *func, long funclen)
{
}
int xdi_diff_outf(mmfile_t *mf1, mmfile_t *mf2,
xdiff_emit_consume_fn fn, void *consume_callback_data,
xdiff_emit_hunk_fn hunk_fn,
xdiff_emit_line_fn line_fn,
void *consume_callback_data,
xpparam_t const *xpp, xdemitconf_t const *xecfg)
{
int ret;
@ -149,10 +132,13 @@ int xdi_diff_outf(mmfile_t *mf1, mmfile_t *mf2,
xdemitcb_t ecb;
memset(&state, 0, sizeof(state));
state.consume = fn;
state.hunk_fn = hunk_fn;
state.line_fn = line_fn;
state.consume_callback_data = consume_callback_data;
memset(&ecb, 0, sizeof(ecb));
ecb.outf = xdiff_outf;
if (hunk_fn)
ecb.out_hunk = xdiff_out_hunk;
ecb.out_line = xdiff_outf;
ecb.priv = &state;
strbuf_init(&state.remainder, 0);
ret = xdi_diff(mf1, mf2, xpp, xecfg, &ecb);

21
xdiff-interface.h
View File

@ -11,15 +11,18 @@
*/
#define MAX_XDIFF_SIZE (1024UL * 1024 * 1023)
typedef void (*xdiff_emit_consume_fn)(void *, char *, unsigned long);
typedef void (*xdiff_emit_line_fn)(void *, char *, unsigned long);
typedef void (*xdiff_emit_hunk_fn)(void *data,
long old_begin, long old_nr,
long new_begin, long new_nr,
const char *func, long funclen);
int xdi_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp, xdemitconf_t const *xecfg, xdemitcb_t *ecb);
int xdi_diff_outf(mmfile_t *mf1, mmfile_t *mf2,
xdiff_emit_consume_fn fn, void *consume_callback_data,
xdiff_emit_hunk_fn hunk_fn,
xdiff_emit_line_fn line_fn,
void *consume_callback_data,
xpparam_t const *xpp, xdemitconf_t const *xecfg);
int parse_hunk_header(char *line, int len,
int *ob, int *on,
int *nb, int *nn);
int read_mmfile(mmfile_t *ptr, const char *filename);
void read_mmblob(mmfile_t *ptr, const struct object_id *oid);
int buffer_is_binary(const char *ptr, unsigned long size);
@ -29,6 +32,14 @@ extern void xdiff_clear_find_func(xdemitconf_t *xecfg);
extern int git_xmerge_config(const char *var, const char *value, void *cb);
extern int git_xmerge_style;
/*
* Can be used as a no-op hunk_fn for xdi_diff_outf(), since a NULL
* one just sends the hunk line to the line_fn callback).
*/
void discard_hunk_line(void *priv,
long ob, long on, long nb, long nn,
const char *func, long funclen);
/*
* Compare the strings l1 with l2 which are of size s1 and s2 respectively.
* Returns 1 if the strings are deemed equal, 0 otherwise.

6
xdiff/xdiff.h
View File

@ -86,7 +86,11 @@ typedef struct s_xpparam {
typedef struct s_xdemitcb {
void *priv;
int (*outf)(void *, mmbuffer_t *, int);
int (*out_hunk)(void *,
long old_begin, long old_nr,
long new_begin, long new_nr,
const char *func, long funclen);
int (*out_line)(void *, mmbuffer_t *, int);
} xdemitcb_t;
typedef long (*find_func_t)(const char *line, long line_len, char *buffer, long buffer_size, void *priv);

21
xdiff/xutils.c
View File

@ -54,7 +54,7 @@ int xdl_emit_diffrec(char const *rec, long size, char const *pre, long psize,
mb[2].size = strlen(mb[2].ptr);
i++;
}
if (ecb->outf(ecb->priv, mb, i) < 0) {
if (ecb->out_line(ecb->priv, mb, i) < 0) {
return -1;
}
@ -344,8 +344,9 @@ int xdl_num_out(char *out, long val) {
return str - out;
}
int xdl_emit_hunk_hdr(long s1, long c1, long s2, long c2,
const char *func, long funclen, xdemitcb_t *ecb) {
static int xdl_format_hunk_hdr(long s1, long c1, long s2, long c2,
const char *func, long funclen,
xdemitcb_t *ecb) {
int nb = 0;
mmbuffer_t mb;
char buf[128];
@ -387,9 +388,21 @@ int xdl_emit_hunk_hdr(long s1, long c1, long s2, long c2,
mb.ptr = buf;
mb.size = nb;
if (ecb->outf(ecb->priv, &mb, 1) < 0)
if (ecb->out_line(ecb->priv, &mb, 1) < 0)
return -1;
return 0;
}
int xdl_emit_hunk_hdr(long s1, long c1, long s2, long c2,
const char *func, long funclen,
xdemitcb_t *ecb) {
if (!ecb->out_hunk)
return xdl_format_hunk_hdr(s1, c1, s2, c2, func, funclen, ecb);
if (ecb->out_hunk(ecb->priv,
c1 ? s1 : s1 - 1, c1,
c2 ? s2 : s2 - 1, c2,
func, funclen) < 0)
return -1;
return 0;
}