From 3bc4153bc2d6ee6eb821275bfb303633b4c2d7f1 Mon Sep 17 00:00:00 2001
From: mhoffm <mhoffm@posteo.de>
Date: Sun, 20 Jun 2021 23:11:21 +0200
Subject: [PATCH] add sanity assertions

---
 src/scanner.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/scanner.c b/src/scanner.c
index 6ac5bf6..5247c57 100644
--- a/src/scanner.c
+++ b/src/scanner.c
@@ -3,6 +3,7 @@
 #include <wctype.h>
 #include <string.h>
 #include <stdio.h>
+#include <assert.h>
 
 enum TokenType {
   QUOTED_TEMPLATE_START,
@@ -63,6 +64,7 @@ void scanner_enter_interpolation_context(Scanner *scanner) {
 }
 
 void scanner_exit_interpolation_context(Scanner *scanner) {
+  assert(scanner->template_interpolation_depth > 0);
   scanner->template_interpolation_depth--;
   scanner->in_template_interpolation = false;
   if (scanner->quoted_context_depth > 0) {
@@ -77,6 +79,7 @@ void scanner_enter_quoted_context(Scanner *scanner) {
 }
 
 void scanner_exit_quoted_context(Scanner *scanner) {
+  assert(scanner->quoted_context_depth > 0);
   scanner->quoted_context_depth--;
   scanner->in_quoted_context = false;
   if (scanner->template_interpolation_depth > 0) {