lang: ast: add diag support to parser

lang/ast/ctx.c

@@ -4,6 +4,7 @@
 #include "node.h"
 
 #include <blue/core/queue.h>
+#include <ivy/diag.h>
 #include <ivy/lang/ast.h>
 #include <stddef.h>
 #include <stdio.h>
@@ -67,6 +68,13 @@ void ivy_parser_destroy(struct ivy_parser *parser, struct ivy_ast_node **result)
 	free(parser);
 }
 
+enum ivy_status ivy_parser_set_diag_ctx(
+	struct ivy_parser *parser, struct ivy_diag_ctx *ctx)
+{
+	parser->p_diag_ctx = ctx;
+	return IVY_OK;
+}
+
 enum ivy_status ivy_parser_get_status(struct ivy_parser *parser)
 {
 	return parser->p_status;
@@ -266,3 +274,30 @@ struct ivy_ast_node *ivy_parser_dequeue_node(struct ivy_parser *parser)
 
 	return b_unbox(struct ivy_ast_node, entry, n_entry);
 }
+
+struct ivy_diag *parser_push_diag(
+	struct ivy_parser *parser, unsigned long diag_class, unsigned long msg,
+	struct ivy_token *tok)
+{
+	struct ivy_diag *diag
+		= ivy_diag_ctx_create_diag(parser->p_diag_ctx, diag_class);
+
+	if (msg != 0) {
+		ivy_diag_push_msg(diag, msg);
+	}
+
+	if (tok) {
+		const struct ivy_diag_highlight hl[] = {
+			IVY_DIAG_HL(
+				ERROR, tok->t_start.c_row, tok->t_start.c_col,
+				tok->t_end.c_row, tok->t_end.c_col),
+		};
+		const size_t nr_hl = sizeof hl / sizeof hl[0];
+
+		ivy_diag_push_snippet(
+			diag, tok->t_start.c_row, tok->t_end.c_row, NULL, 0, hl,
+			nr_hl);
+	};
+
+	return diag;
+}