Move left pane entirely to React

ts/components/MessageBodyHighlight.tsx

@@ -0,0 +1,111 @@
+import React from 'react';
+
+import { MessageBody } from './conversation/MessageBody';
+import { Emojify } from './conversation/Emojify';
+import { AddNewLines } from './conversation/AddNewLines';
+
+import { SizeClassType } from '../util/emoji';
+
+import { LocalizerType, RenderTextCallbackType } from '../types/Util';
+
+interface Props {
+  text: string;
+  i18n: LocalizerType;
+}
+
+const renderNewLines: RenderTextCallbackType = ({ text, key }) => (
+  <AddNewLines key={key} text={text} />
+);
+
+const renderEmoji = ({
+  i18n,
+  text,
+  key,
+  sizeClass,
+  renderNonEmoji,
+}: {
+  i18n: LocalizerType;
+  text: string;
+  key: number;
+  sizeClass?: SizeClassType;
+  renderNonEmoji: RenderTextCallbackType;
+}) => (
+  <Emojify
+    i18n={i18n}
+    key={key}
+    text={text}
+    sizeClass={sizeClass}
+    renderNonEmoji={renderNonEmoji}
+  />
+);
+
+export class MessageBodyHighlight extends React.Component<Props> {
+  public render() {
+    const { text, i18n } = this.props;
+    const results: Array<any> = [];
+    const FIND_BEGIN_END = /<<left>>(.+?)<<right>>/g;
+
+    let match = FIND_BEGIN_END.exec(text);
+    let last = 0;
+    let count = 1;
+
+    if (!match) {
+      return (
+        <MessageBody
+          disableJumbomoji={true}
+          disableLinks={true}
+          text={text}
+          i18n={i18n}
+        />
+      );
+    }
+
+    const sizeClass = '';
+
+    while (match) {
+      if (last < match.index) {
+        const beforeText = text.slice(last, match.index);
+        results.push(
+          renderEmoji({
+            text: beforeText,
+            sizeClass,
+            key: count++,
+            i18n,
+            renderNonEmoji: renderNewLines,
+          })
+        );
+      }
+
+      const [, toHighlight] = match;
+      results.push(
+        <span className="module-message-body__highlight" key={count++}>
+          {renderEmoji({
+            text: toHighlight,
+            sizeClass,
+            key: count++,
+            i18n,
+            renderNonEmoji: renderNewLines,
+          })}
+        </span>
+      );
+
+      // @ts-ignore
+      last = FIND_BEGIN_END.lastIndex;
+      match = FIND_BEGIN_END.exec(text);
+    }
+
+    if (last < text.length) {
+      results.push(
+        renderEmoji({
+          text: text.slice(last),
+          sizeClass,
+          key: count++,
+          i18n,
+          renderNonEmoji: renderNewLines,
+        })
+      );
+    }
+
+    return results;
+  }
+}