Function _replace_remove_clause

src/ast/ast_rewrite_same_clauses.c:202–233

compresses multiple consecutive REMOVE clauses into a single REMOVE clause

// compresses multiple consecutive REMOVE clauses into a single REMOVE clause
static void _replace_remove_clause
(
	cypher_astnode_t *root,      // ast root
	cypher_astnode_t **clauses,  // clause being replaced
	int scope_start,             // beginning of scope
	int scope_end,               // ending of scope
	replace_func replace         // replace function pointer
) {
	uint count = array_len(clauses);

	struct cypher_input_range range = cypher_astnode_range(clauses[0]);
	cypher_astnode_t **items = array_new(cypher_astnode_t *, count);

	for (uint i = 0; i < count; i++) {
		uint nitems = cypher_ast_remove_nitems(clauses[i]);
		for(uint j = 0; j < nitems; j++) {
			const cypher_astnode_t *item =
				cypher_ast_remove_get_item(clauses[i], j);
			array_append(items, cypher_ast_clone(item));
		}
	}
	
	// build the replacement clause
	cypher_astnode_t *new_clause =
		cypher_ast_remove(items, array_len(items), items, array_len(items),
				range);

	// replace original clause with fully populated one
	replace(root, new_clause, scope_start, scope_end);
	
	array_free(items);
}

// tries to compress clauses of a query or a foreach clause
// returns true if a rewrite occurred