code file support syntax highlight (#6922)

* code file support syntax highlight

* add theme.js

---------

Co-authored-by: zhouwenxuan <aries@Mac.local>

frontend/src/components/seafile-codemirror/index.js

@@ -1,11 +1,8 @@
 import React from 'react';
 import PropTypes from 'prop-types';
 import CodeMirror from '@uiw/react-codemirror';
-import { EditorView } from '@codemirror/view';
-import { loadLanguage } from '@uiw/codemirror-extensions-langs';
-import { Utils } from '../../utils/utils';
-
-import './style.css';
+import { getLanguageExtensions } from './languages';
+import { myTheme } from './theme';
 
 const DEFAULT_CODEMIRROR_OPTIONS = {
   lineNumbers: true,
@@ -31,41 +28,21 @@ class SeafileCodeMirror extends React.Component {
     this.options = null;
   }
 
-  getOptions = () => {
-    if (this.options) return this.options;
-
-    const { fileExt, readOnly } = this.props;
-    const mode = Utils.chooseLanguage(fileExt);
-    const extensions = loadLanguage(mode);
-    if (extensions) {
-      return {
-        theme: 'light',
-        readOnly: readOnly,
-        extensions: extensions,
-      };
-    }
-    return {
-      theme: 'light',
-      readOnly: readOnly,
-    };
-  };
-
   onChange = (value) => {
     this.props.onChange && this.props.onChange(value);
   };
 
   render() {
-    const { value } = this.props;
-    const options = this.getOptions();
+    const { value, readOnly, fileExt } = this.props;
     return (
       <div className='seafile-code-mirror-container'>
         <CodeMirror
-          ref="code-mirror-editor"
           value={value}
-          {...options}
-          onChange={this.onChange}
           basicSetup={DEFAULT_CODEMIRROR_OPTIONS}
-          extensions={[EditorView.lineWrapping]}
+          theme={myTheme}
+          readOnly={readOnly}
+          extensions={[...getLanguageExtensions(fileExt)]}
+          onChange={this.onChange}
         />
       </div>
     );

frontend/src/components/seafile-codemirror/languages.js

@@ -0,0 +1,30 @@
+import { python } from '@codemirror/lang-python';
+import { javascript } from '@codemirror/lang-javascript';
+import { cpp } from '@codemirror/lang-cpp';
+import { java } from '@codemirror/lang-java';
+import { shell } from '@codemirror/legacy-modes/mode/shell';
+import { html } from '@codemirror/lang-html';
+import { loadLanguage } from '@uiw/codemirror-extensions-langs';
+import { Utils } from '../../utils/utils';
+
+export const getLanguageExtensions = (fileExt) => {
+  const mode = Utils.chooseLanguage(fileExt);
+
+  switch (mode) {
+    case 'javascript':
+      return [javascript({ jsx: true })];
+    case 'python':
+      return [python()];
+    case 'cpp':
+    case 'c':
+      return [cpp()];
+    case 'java':
+      return [java()];
+    case 'shell':
+      return [shell()];
+    case 'html':
+      return [html()];
+    default:
+      return [loadLanguage(mode)];
+  }
+};

frontend/src/components/seafile-codemirror/theme.js

@@ -0,0 +1,70 @@
+
+import { tags as t } from '@lezer/highlight';
+import { createTheme } from '@uiw/codemirror-themes';
+
+import './style.css';
+
+export const myTheme = createTheme({
+  theme: 'light',
+  settings: {
+    background: '#ffffff',
+    foreground: '#383a42',
+    caret: '#000',
+    selection: '#add6ff',
+    selectionMatch: '#a8ac94',
+    lineHighlight: '#99999926',
+    gutterBackground: '#fff',
+    gutterForeground: '#237893',
+    gutterActiveForeground: '#0b216f',
+    fontFamily: 'Menlo, Monaco, Consolas, "Andale Mono", "Ubuntu Mono", "Courier New", monospace',
+  },
+  styles: [
+    {
+      tag: [
+        t.keyword,
+        t.operatorKeyword,
+        t.modifier,
+        t.color,
+        t.constant(t.name),
+        t.standard(t.name),
+        t.standard(t.tagName),
+        t.special(t.brace),
+        t.atom,
+        t.bool,
+        t.special(t.variableName),
+      ],
+      color: '#0000ff',
+    },
+    { tag: [t.moduleKeyword, t.controlKeyword], color: '#af00db' },
+    {
+      tag: [
+        t.name,
+        t.deleted,
+        t.character,
+        t.macroName,
+        t.propertyName,
+        t.variableName,
+        t.labelName,
+        t.definition(t.name),
+      ],
+      color: '#0070c1',
+    },
+    { tag: t.heading, fontWeight: 'bold', color: '#0070c1' },
+    {
+      tag: [t.typeName, t.className, t.tagName, t.number, t.changed, t.annotation, t.self, t.namespace],
+      color: '#267f99',
+    },
+    { tag: [t.function(t.variableName), t.function(t.propertyName)], color: '#795e26' },
+    { tag: [t.number], color: '#098658' },
+    { tag: [t.operator, t.punctuation, t.separator, t.url, t.escape, t.regexp], color: '#383a42' },
+    { tag: [t.regexp], color: '#af00db' },
+    { tag: [t.special(t.string), t.processingInstruction, t.string, t.inserted], color: '#a31515' },
+    { tag: [t.angleBracket], color: '#383a42' },
+    { tag: t.strong, fontWeight: 'bold' },
+    { tag: t.emphasis, fontStyle: 'italic' },
+    { tag: t.strikethrough, textDecoration: 'line-through' },
+    { tag: [t.meta, t.comment], color: '#008000' },
+    { tag: t.link, color: '#4078f2', textDecoration: 'underline' },
+    { tag: t.invalid, color: '#e45649' },
+  ],
+});