static int ensure_left_hand_identifier_is_not_known_yet(git_object *object, git_reference *reference)
{
if (!ensure_base_rev_is_not_known_yet(object) && reference == NULL)
return 0;
return GIT_EINVALIDSPEC;
}
static int ensure_left_hand_identifier_is_not_known_yet(git_object *object, git_reference *reference, const char *spec)
{
if (!ensure_base_rev_is_not_known_yet(object, spec) && reference == NULL)
return 0;
return revspec_error(spec);
}
int revparse__ext(
git_object **object_out,
git_reference **reference_out,
size_t *identifier_len_out,
git_repository *repo,
const char *spec)
{
size_t pos = 0, identifier_len = 0;
int error = -1, n;
git_buf buf = GIT_BUF_INIT;
git_reference *reference = NULL;
git_object *base_rev = NULL;
bool should_return_reference = true;
assert(object_out && reference_out && repo && spec);
*object_out = NULL;
*reference_out = NULL;
while (spec[pos]) {
switch (spec[pos]) {
case '^':
should_return_reference = false;
if ((error = ensure_base_rev_loaded(&base_rev, &reference, spec, identifier_len, repo, false)) < 0)
goto cleanup;
if (spec[pos+1] == '{') {
git_object *temp_object = NULL;
if ((error = extract_curly_braces_content(&buf, spec, &pos)) < 0)
goto cleanup;
if ((error = handle_caret_curly_syntax(&temp_object, base_rev, git_buf_cstr(&buf))) < 0)
goto cleanup;
git_object_free(base_rev);
base_rev = temp_object;
} else {
git_object *temp_object = NULL;
if ((error = extract_how_many(&n, spec, &pos)) < 0)
goto cleanup;
if ((error = handle_caret_parent_syntax(&temp_object, base_rev, n)) < 0)
goto cleanup;
git_object_free(base_rev);
base_rev = temp_object;
}
break;
case '~':
{
git_object *temp_object = NULL;
should_return_reference = false;
if ((error = extract_how_many(&n, spec, &pos)) < 0)
goto cleanup;
if ((error = ensure_base_rev_loaded(&base_rev, &reference, spec, identifier_len, repo, false)) < 0)
goto cleanup;
if ((error = handle_linear_syntax(&temp_object, base_rev, n)) < 0)
goto cleanup;
git_object_free(base_rev);
base_rev = temp_object;
break;
}
case ':':
{
git_object *temp_object = NULL;
should_return_reference = false;
if ((error = extract_path(&buf, spec, &pos)) < 0)
goto cleanup;
if (any_left_hand_identifier(base_rev, reference, identifier_len)) {
if ((error = ensure_base_rev_loaded(&base_rev, &reference, spec, identifier_len, repo, true)) < 0)
goto cleanup;
if ((error = handle_colon_syntax(&temp_object, base_rev, git_buf_cstr(&buf))) < 0)
goto cleanup;
} else {
if (*git_buf_cstr(&buf) == '/') {
if ((error = handle_grep_syntax(&temp_object, repo, NULL, git_buf_cstr(&buf) + 1)) < 0)
goto cleanup;
} else {
/*
* TODO: support merge-stage path lookup (":2:Makefile")
* and plain index blob lookup (:i-am/a/blob)
*/
giterr_set(GITERR_INVALID, "unimplemented");
error = GIT_ERROR;
goto cleanup;
}
}
git_object_free(base_rev);
base_rev = temp_object;
break;
}
case '@':
{
if (spec[pos+1] == '{') {
git_object *temp_object = NULL;
if ((error = extract_curly_braces_content(&buf, spec, &pos)) < 0)
goto cleanup;
if ((error = ensure_base_rev_is_not_known_yet(base_rev)) < 0)
goto cleanup;
if ((error = handle_at_syntax(&temp_object, &reference, spec, identifier_len, repo, git_buf_cstr(&buf))) < 0)
goto cleanup;
if (temp_object != NULL)
base_rev = temp_object;
break;
} else {
/* Fall through */
}
}
default:
if ((error = ensure_left_hand_identifier_is_not_known_yet(base_rev, reference)) < 0)
goto cleanup;
pos++;
identifier_len++;
}
}
if ((error = ensure_base_rev_loaded(&base_rev, &reference, spec, identifier_len, repo, false)) < 0)
goto cleanup;
if (!should_return_reference) {
git_reference_free(reference);
reference = NULL;
}
*object_out = base_rev;
*reference_out = reference;
*identifier_len_out = identifier_len;
error = 0;
cleanup:
if (error) {
if (error == GIT_EINVALIDSPEC)
giterr_set(GITERR_INVALID,
"failed to parse revision specifier - Invalid pattern '%s'", spec);
git_object_free(base_rev);
git_reference_free(reference);
}
git_buf_free(&buf);
return error;
}
