Function extract_prop_string

src/graph_buffer/graph_buffer.c:1375–1391

Extract a string property from a properties JSON string. * Returns heap-allocated string or NULL. Caller must free. * Parses real JSON: the dump writer feeds these values into indexes whose * backing columns are GENERATED AS json_extract(properties,'$. '). * Naive byte slicing returned the ESCAPED text (and cut at embedded \\") * while json_extract yields the unescaped value — the mismatc

 * "missing from index idx_edges_url_path" under PRAGMA integrity_check.
 * key_quoted ("\"key\"") is a fast pre-filter to skip the JSON parse. */
static char *extract_prop_string(const char *props, const char *key_quoted, const char *key) {
    if (!props || !strstr(props, key_quoted)) {
        return NULL;
    }
    yyjson_doc *doc = yyjson_read(props, strlen(props), 0);
    if (!doc) {
        return NULL;
    }
    char *out = NULL;
    yyjson_val *v = yyjson_obj_get(yyjson_doc_get_root(doc), key);
    if (v && yyjson_is_str(v)) {
        const char *sv = yyjson_get_str(v);
        out = cbm_strndup(sv, strlen(sv));
    }
    yyjson_doc_free(doc);
    return out;
}

static char *extract_url_path(const char *props) {
    return extract_prop_string(props, "\"url_path\"", "url_path");