Function node_keys_list

src/cypher/cypher.c:3524–3557

Build a JSON list of a node's non-null property keys: keys(n). */

/* Build a JSON list of a node's non-null property keys: keys(n). */
static const char *node_keys_list(const cbm_node_t *n, char *buf, size_t buf_sz) {
    const struct {
        const char *k;
        bool present;
    } ks[] = {
        {"name", n->name && n->name[0]},
        {"qualified_name", n->qualified_name && n->qualified_name[0]},
        {"label", n->label && n->label[0]},
        {"file_path", n->file_path && n->file_path[0]},
        {"start_line", n->start_line > 0},
        {"end_line", n->end_line > 0},
    };
    size_t pos = 0;
    bool first = true;
    if (pos < buf_sz - SKIP_ONE) {
        buf[pos++] = '[';
    }
    for (size_t i = 0; i < sizeof(ks) / sizeof(ks[0]) && pos < buf_sz - SKIP_ONE; i++) {
        if (!ks[i].present) {
            continue;
        }
        int w = snprintf(buf + pos, buf_sz - pos, "%s\"%s\"", first ? "" : ",", ks[i].k);
        if (w < 0 || (size_t)w >= buf_sz - pos) {
            break;
        }
        pos += (size_t)w;
        first = false;
    }
    if (pos < buf_sz - SKIP_ONE) {
        buf[pos++] = ']';
    }
    buf[pos] = '\0';
    return buf;
}

/* Resolve a function argument to its string value (literal or var.prop). */
static const char *eval_func_arg(binding_t *b, const cbm_func_arg_t *a) {