Function parse_match_pattern

src/cypher/cypher.c:1846–1878

Parse a single MATCH pattern into pat */

/* Parse a single MATCH pattern into pat */
static int parse_match_pattern(parser_t *p, cbm_pattern_t *pat) {
    memset(pat, 0, sizeof(*pat));
    int node_cap = CYP_INIT_CAP4;
    int rel_cap = CYP_INIT_CAP4;
    pat->nodes = malloc(node_cap * sizeof(cbm_node_pattern_t));
    pat->rels = calloc(rel_cap, sizeof(cbm_rel_pattern_t));

    if (parse_node(p, &pat->nodes[0]) < 0) {
        return CBM_NOT_FOUND;
    }
    pat->node_count = SKIP_ONE;

    while (check(p, TOK_DASH) || check(p, TOK_LT)) {
        if (pat->rel_count >= rel_cap) {
            rel_cap *= PAIR_LEN;
            pat->rels = safe_realloc(pat->rels, rel_cap * sizeof(cbm_rel_pattern_t));
        }
        if (parse_rel(p, &pat->rels[pat->rel_count]) < 0) {
            return CBM_NOT_FOUND;
        }
        pat->rel_count++;

        if (pat->node_count >= node_cap) {
            node_cap *= PAIR_LEN;
            pat->nodes = safe_realloc(pat->nodes, node_cap * sizeof(cbm_node_pattern_t));
        }
        if (parse_node(p, &pat->nodes[pat->node_count]) < 0) {
            return CBM_NOT_FOUND;
        }
        pat->node_count++;
    }
    return 0;
}

/* Parse UNWIND [...] AS var clause into query */
static void parse_unwind_clause(parser_t *p, cbm_query_t *q) {