DevTools: Changes View

third_party/WebKit/Source/devtools/front_end/changes/ChangesHighlighter.js

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @param {!Object} config
+ * @param {{rows: !Array<!Changes.ChangesView.Row>}} parserConfig
+ * @return {{
+ *  startState: function():!Changes.ChangesHighlighter.DiffState,
+ *  token: function({next: function()}, !Changes.ChangesHighlighter.DiffState):string,
+ *  blankLine: function(!Changes.ChangesHighlighter.DiffState):string,
+ * }}
+ */
+Changes.ChangesHighlighter = function(config, parserConfig) {
+  var rows = parserConfig.rows;
+
+  return {
+    /**
+     * @return {!Changes.ChangesHighlighter.DiffState}
+     */
+    startState: function() {
+      return {lineNumber: 0, index: 0};
+    },
+
+    /**
+     * @param {!{next: function()}} stream
+     * @param {!Changes.ChangesHighlighter.DiffState} state
+     * @return {string}
+     */
+    token: function(stream, state) {
+      var row = rows[state.lineNumber];
+      if (!row) {
+        stream.next();
+        return '';
+      }
+      var classes = '';
+      if (state.index === 0)
+        classes += ' line-background-' + row.type + ' line-' + row.type;
+      stream.pos += row.content[state.index].text.length;
+      classes += ' ' + row.content[state.index].className;
+      state.index++;
+      if (state.index >= row.content.length) {
+        state.lineNumber++;
+        state.index = 0;
+      }
+      return classes;
+    },
+
+    /**
+     * @param {!Changes.ChangesHighlighter.DiffState} state
+     * @return {string}
+     */
+    blankLine: function(state) {
+      var row = rows[state.lineNumber];
+      state.lineNumber++;
+      state.index = 0;
+      if (!row)
+        return '';
+      return 'line-background-' + row.type + ' line-' + row.type;
+    }
+  };
+};
+
+/** @typedef {!{lineNumber: number, index: number}} */
+Changes.ChangesHighlighter.DiffState;
+
+CodeMirror.defineMode('devtools-diff', Changes.ChangesHighlighter);