lang: ast: transparently ignore linefeeds if the current parse context doesn't handle them

lang/ast/ctx.c

@@ -44,13 +44,18 @@ enum ivy_status ivy_parser_push_token(
 	}
 
 	token_parse_function func = get_token_parser(state->s_node, tok);
-	if (!func) {
-		parser->p_status = IVY_ERR_BAD_SYNTAX;
-		return IVY_ERR_BAD_SYNTAX;
+	if (func) {
+		parser->p_status = func(parser, tok);
+		return parser->p_status;
 	}
 
-	parser->p_status = func(parser, tok);
-	return parser->p_status;
+	if (tok->t_type == IVY_TOK_LINEFEED) {
+		ivy_token_destroy(tok);
+		return IVY_OK;
+	}
+
+	parser->p_status = IVY_ERR_BAD_SYNTAX;
+	return IVY_ERR_BAD_SYNTAX;
 }
 
 struct parser_state *parser_get_state_generic(struct ivy_parser *parser)
@@ -106,7 +111,7 @@ void parser_pop_state(struct ivy_parser *parser, enum pop_state_flags flags)
 	struct parser_state *state = b_unbox(struct parser_state, entry, s_entry);
 	b_queue_pop_back(&parser->p_state);
 
-	if (flags & STATE_ADD_NODE_TO_PARENT) {
+	if (state && (flags & STATE_ADD_NODE_TO_PARENT)) {
 		ast_node_add_child(state->s_parent, state->s_node);
 	}
 
@@ -122,7 +127,7 @@ struct ivy_ast_node *ivy_parser_root_node(struct ivy_parser *parser)
 {
 	b_queue_entry *entry = b_queue_first(&parser->p_state);
 	struct parser_state *state = b_unbox(struct parser_state, entry, s_entry);
-	return state->s_node;
+	return state ? state->s_node : NULL;
 }
 
 struct ivy_ast_node *ivy_parser_dequeue_node(struct ivy_parser *parser)
@@ -130,6 +135,10 @@ struct ivy_ast_node *ivy_parser_dequeue_node(struct ivy_parser *parser)
 	b_queue_entry *entry = b_queue_first(&parser->p_state);
 	struct parser_state *state = b_unbox(struct parser_state, entry, s_entry);
 	
+	if (!state) {
+		return NULL;
+	}
+
 	if (state->s_node->n_type != IVY_AST_UNIT) {
 		return NULL;
 	}