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Merge branch 'jk/xdiff-interface'

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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
Download Patch File Download Diff File Expand all files Collapse all files

67
combine-diff.c
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@@ -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);