1 files changed, 32 insertions, 0 deletions

diff --git a/language-web/src/main/js/components/XtextCodeMirror.jsx b/language-web/src/main/js/components/XtextCodeMirror.jsx
new file mode 100644
index 00000000..75a20daa
--- /dev/null
+++ b/language-web/src/main/js/components/XtextCodeMirror.jsx
@@ -0,0 +1,32 @@
+import React, { useCallback, useState } from 'react';
+import { Controlled as CodeMirror } from 'react-codemirror2';
+import 'mode-problem';
+import { createServices, removeServices } from 'xtext/xtext-codemirror';
+
+export default function XtextCodeMirror({ initialValue }) {
+  const [value, setValue] = useState(initialValue);
+
+  const codeMirrorOptions = {
+    mode: 'xtext/problem',
+    indentUnit: 2,
+  };
+
+  const xtextOptions = {
+    xtextLang: 'problem',
+    enableFormattingAction: true,
+  };
+
+  const onBeforeChange = useCallback((_editor, _data, newValue) => {
+    setValue(newValue);
+  }, [setValue]);
+
+  return (
+    <CodeMirror
+      value={value}
+      options={codeMirrorOptions}
+      editorDidMount={editor => createServices(editor, xtextOptions)}
+      editorWillUnmount={removeServices}
+      onBeforeChange={onBeforeChange}
+    />
+  );
+};