Function cbm_template_string_text

internal/cbm/helpers.c:1635–1666

Flatten a JS/TS `template_string` node into plain text (issue #1006). * String fragments are kept verbatim; each ${...} substitution becomes the * "{}" placeholder so client URLs built from template literals share the * canonical parameter shape of server-side route paths * (`/things/${id}/x` -> "/things/{}/x"). Returns NULL when the node yields * no text or exceeds the route-sized buffer. */

 * (`/things/${id}/x` -> "/things/{}/x"). Returns NULL when the node yields
 * no text or exceeds the route-sized buffer. */
const char *cbm_template_string_text(CBMArena *a, TSNode node, const char *source) {
    enum { TPL_BUF = 512 };
    char buf[TPL_BUF];
    size_t pos = 0;
    uint32_t nc = ts_node_named_child_count(node);
    for (uint32_t i = 0; i < nc; i++) {
        TSNode c = ts_node_named_child(node, i);
        const char *k = ts_node_type(c);
        if (strcmp(k, "string_fragment") == 0) {
            char *frag = cbm_node_text(a, c, source);
            if (!frag) {
                continue;
            }
            size_t fl = strlen(frag);
            if (pos + fl >= TPL_BUF) {
                return NULL;
            }
            memcpy(buf + pos, frag, fl);
            pos += fl;
        } else if (strcmp(k, "template_substitution") == 0) {
            if (pos + PAIR_LEN >= TPL_BUF) {
                return NULL;
            }
            buf[pos++] = '{';
            buf[pos++] = '}';
        }
    }
    if (pos == 0) {
        return NULL;
    }
    return cbm_arena_strndup(a, buf, pos);
}