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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "common.h"
#include "diff.h"
#include "diff_driver.h"
#include "diff_patch.h"
#include "diff_xdiff.h"
static int git_xdiff_scan_int(const char **str, int *value)
{
const char *scan = *str;
int v = 0, digits = 0;
/* find next digit */
for (scan = *str; *scan && !git__isdigit(*scan); scan++);
/* parse next number */
for (; git__isdigit(*scan); scan++, digits++)
v = (v * 10) + (*scan - '0');
*str = scan;
*value = v;
return (digits > 0) ? 0 : -1;
}
static int git_xdiff_parse_hunk(git_diff_range *range, const char *header)
{
/* expect something of the form "@@ -%d[,%d] +%d[,%d] @@" */
if (*header != '@')
return -1;
if (git_xdiff_scan_int(&header, &range->old_start) < 0)
return -1;
if (*header == ',') {
if (git_xdiff_scan_int(&header, &range->old_lines) < 0)
return -1;
} else
range->old_lines = 1;
if (git_xdiff_scan_int(&header, &range->new_start) < 0)
return -1;
if (*header == ',') {
if (git_xdiff_scan_int(&header, &range->new_lines) < 0)
return -1;
} else
range->new_lines = 1;
if (range->old_start < 0 || range->new_start < 0)
return -1;
return 0;
}
typedef struct {
git_xdiff_output *xo;
git_diff_patch *patch;
git_diff_range range;
} git_xdiff_info;
static int git_xdiff_cb(void *priv, mmbuffer_t *bufs, int len)
{
git_xdiff_info *info = priv;
git_diff_patch *patch = info->patch;
const git_diff_delta *delta = git_diff_patch_delta(patch);
git_diff_output *output = &info->xo->output;
if (len == 1) {
output->error = git_xdiff_parse_hunk(&info->range, bufs[0].ptr);
if (output->error < 0)
return output->error;
if (output->hunk_cb != NULL &&
output->hunk_cb(delta, &info->range,
bufs[0].ptr, bufs[0].size, output->payload))
output->error = GIT_EUSER;
}
if (len == 2 || len == 3) {
/* expect " "/"-"/"+", then data */
char origin =
(*bufs[0].ptr == '+') ? GIT_DIFF_LINE_ADDITION :
(*bufs[0].ptr == '-') ? GIT_DIFF_LINE_DELETION :
GIT_DIFF_LINE_CONTEXT;
if (output->data_cb != NULL &&
output->data_cb(delta, &info->range,
origin, bufs[1].ptr, bufs[1].size, output->payload))
output->error = GIT_EUSER;
}
if (len == 3 && !output->error) {
/* If we have a '+' and a third buf, then we have added a line
* without a newline and the old code had one, so DEL_EOFNL.
* If we have a '-' and a third buf, then we have removed a line
* with out a newline but added a blank line, so ADD_EOFNL.
*/
char origin =
(*bufs[0].ptr == '+') ? GIT_DIFF_LINE_DEL_EOFNL :
(*bufs[0].ptr == '-') ? GIT_DIFF_LINE_ADD_EOFNL :
GIT_DIFF_LINE_CONTEXT_EOFNL;
if (output->data_cb != NULL &&
output->data_cb(delta, &info->range,
origin, bufs[2].ptr, bufs[2].size, output->payload))
output->error = GIT_EUSER;
}
return output->error;
}
static int git_xdiff(git_diff_output *output, git_diff_patch *patch)
{
git_xdiff_output *xo = (git_xdiff_output *)output;
git_xdiff_info info;
git_diff_find_context_payload findctxt;
mmfile_t xd_old_data, xd_new_data;
memset(&info, 0, sizeof(info));
info.patch = patch;
info.xo = xo;
xo->callback.priv = &info;
git_diff_find_context_init(
&xo->config.find_func, &findctxt, git_diff_patch__driver(patch));
xo->config.find_func_priv = &findctxt;
if (xo->config.find_func != NULL)
xo->config.flags |= XDL_EMIT_FUNCNAMES;
else
xo->config.flags &= ~XDL_EMIT_FUNCNAMES;
/* TODO: check ofile.opts_flags to see if driver-specific per-file
* updates are needed to xo->params.flags
*/
git_diff_patch__old_data(&xd_old_data.ptr, &xd_old_data.size, patch);
git_diff_patch__new_data(&xd_new_data.ptr, &xd_new_data.size, patch);
xdl_diff(&xd_old_data, &xd_new_data,
&xo->params, &xo->config, &xo->callback);
git_diff_find_context_clear(&findctxt);
return xo->output.error;
}
void git_xdiff_init(git_xdiff_output *xo, const git_diff_options *opts)
{
uint32_t flags = opts ? opts->flags : GIT_DIFF_NORMAL;
xo->output.diff_cb = git_xdiff;
memset(&xo->config, 0, sizeof(xo->config));
xo->config.ctxlen = opts ? opts->context_lines : 3;
xo->config.interhunkctxlen = opts ? opts->interhunk_lines : 0;
memset(&xo->params, 0, sizeof(xo->params));
if (flags & GIT_DIFF_IGNORE_WHITESPACE)
xo->params.flags |= XDF_WHITESPACE_FLAGS;
if (flags & GIT_DIFF_IGNORE_WHITESPACE_CHANGE)
xo->params.flags |= XDF_IGNORE_WHITESPACE_CHANGE;
if (flags & GIT_DIFF_IGNORE_WHITESPACE_EOL)
xo->params.flags |= XDF_IGNORE_WHITESPACE_AT_EOL;
memset(&xo->callback, 0, sizeof(xo->callback));
xo->callback.outf = git_xdiff_cb;
}
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