lang: ast: implement support for multiple expression terminator tokens

lang/ast/expr/expr.c

@@ -2,6 +2,33 @@
 
 #include "../node.h"
 
+void expr_add_terminator(struct expr_parser_state *state, unsigned short tok)
+{
+	if (state->s_nr_terminators < EXPR_TERMINATOR_MAX) {
+		state->s_terminators[state->s_nr_terminators++] = tok;
+	}
+}
+
+void expr_copy_terminators(const struct expr_parser_state *src, struct expr_parser_state *dest)
+{
+	dest->s_nr_terminators = src->s_nr_terminators;
+
+	for (unsigned int i = 0; i < src->s_nr_terminators; i++) {
+		dest->s_terminators[i] = src->s_terminators[i];
+	}
+}
+
+bool expr_terminates_at_token(struct expr_parser_state *state, unsigned short tok)
+{
+	for (unsigned int i = 0; i < EXPR_TERMINATOR_MAX; i++) {
+		if (state->s_terminators[i] == tok) {
+			return true;
+		}
+	}
+
+	return false;
+}
+
 static enum ivy_status add_child(
 	struct parser_state *parent, struct ivy_ast_node *child)
 {