Function extract_decorators

internal/cbm/extract_defs.c:1962–2028

Comments are NAMED nodes in tree-sitter, so a comment interleaved in a * decorator run would end the walk and silently drop every decorator above it: * * @Post('login') <-- lost * @HttpCode(HttpStatus.OK) <-- lost * // why this route is throttled <-- walk stopped here * @Throttle({ ... }) <-- kept * async login(...) * * Documenting a

 * comments as transparent — like the anonymous tokens already skipped below.
 * (is_comment_node() is defined above, near the docstring helpers.) */
static const char **extract_decorators(CBMArena *a, TSNode node, const char *source,
                                       CBMLanguage lang, const CBMLangSpec *spec) {
    if (!spec->decorator_node_types || !spec->decorator_node_types[0]) {
        return NULL;
    }

    int count = 0;
    TSNode prev = ts_node_prev_sibling(node);
    while (!ts_node_is_null(prev)) {
        if (cbm_kind_in_set(prev, spec->decorator_node_types)) {
            count++;
        } else if (ts_node_is_named(prev) && !is_comment_node(ts_node_type(prev))) {
            /* A real preceding construct ends the decorator run. Anonymous
             * tokens (e.g. TS `export` between `@Decorator` and the
             * `class_declaration`) and comments are skipped so the decorator
             * is still seen. */
            break;
        }
        prev = ts_node_prev_sibling(prev);
    }

    TSNode wrappers[MAX_ATTR_WRAPPERS];
    int wn = 0;
    int mod_count = 0;
    int child_count = 0;
    if (count == 0) {
        wn = find_jvm_modifiers(node, lang, wrappers, MAX_ATTR_WRAPPERS);
        for (int w = 0; w < wn; w++) {
            mod_count += count_modifier_annotations(wrappers[w], spec);
        }
        /* Languages like Scala attach the annotation directly as a child of the
         * definition node (no wrapper, no prev-sibling). */
        if (mod_count == 0) {
            child_count = count_child_decorators(node, spec);
        }
    }

    int total = count + mod_count + child_count;
    if (total == 0) {
        return NULL;
    }

    const char **result =
        (const char **)cbm_arena_alloc(a, sizeof(const char *) * (total + NULL_TERM));
    if (!result) {
        return NULL;
    }

    int idx = 0;
    prev = ts_node_prev_sibling(node);
    while (!ts_node_is_null(prev) && idx < count) {
        if (cbm_kind_in_set(prev, spec->decorator_node_types)) {
            result[idx++] = cbm_node_text(a, prev, source);
        } else if (ts_node_is_named(prev) && !is_comment_node(ts_node_type(prev))) {
            break;
        }
        prev = ts_node_prev_sibling(prev);
    }