Fix playground crash problem

Author: yhirose

.gitignore

@@ -48,3 +48,4 @@ CMakeCache.txt
 .idea/
 grammar/test/*
 .DS_Store
+.vscode/

.pre-commit-config.yaml

@@ -0,0 +1,7 @@
+repos:
+  - repo: https://github.com/pre-commit/mirrors-clang-format
+    rev: v18.1.8
+    hooks:
+      - id: clang-format
+        files: \.(cpp|cc|h)$
+        args: [-i]

docs/build.sh

@@ -1,3 +1,3 @@
 #!/usr/bin/env bash
 source ~/Projects/emsdk/emsdk_env.sh
-emcc -std=c++17 -O3 --bind -o native.js -s ALLOW_MEMORY_GROWTH native.cpp
+emcc -std=c++17 -O3 --bind -o native.js -s ALLOW_MEMORY_GROWTH -fexceptions native.cpp

docs/index.js

@@ -101,11 +101,11 @@ function parse() {
   });
   window.setTimeout(() => {
     const data = JSON.parse(Module.lint(grammarText, codeText, mode, packrat, startRule));
-      $('#overlay').css({
-        'z-index': '-1',
-        'display': 'none',
-        'background-color': 'rgba(1, 1, 1, 1.0)'
-      });
+    $('#overlay').css({
+      'z-index': '-1',
+      'display': 'none',
+      'background-color': 'rgba(1, 1, 1, 1.0)'
+    });
 
     if (data.grammar_valid) {
       $grammarValidation.removeClass('validation-invalid').show();