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Issue 2572053002: DevTools: kill SDK.CSSParser (Closed)
Patch Set: address comments Created 4 years ago
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1 /**
2 * Copyright 2014 The Chromium Authors. All rights reserved.
3 * Use of this source code is governed by a BSD-style license that can be
4 * found in the LICENSE file.
5 */
6
7 /**
8 * @unrestricted
9 */
10 SDK.CSSParser = class extends Common.Object {
11 constructor() {
12 super();
13 this._rules = [];
14 this._terminated = false;
15 }
16
17 /**
18 * @param {!SDK.CSSStyleSheetHeader} styleSheetHeader
19 * @param {function(!Array.<!Common.FormatterWorkerPool.CSSRule>)=} callback
20 */
21 fetchAndParse(styleSheetHeader, callback) {
22 this._lock();
23 this._finishedCallback = callback;
24 styleSheetHeader.requestContent().then(this._innerParse.bind(this));
25 }
26
27 /**
28 * @param {string} text
29 * @param {function(!Array.<!Common.FormatterWorkerPool.CSSRule>)=} callback
30 */
31 parse(text, callback) {
32 this._lock();
33 this._finishedCallback = callback;
34 this._innerParse(text);
35 }
36
37 /**
38 * @param {string} text
39 * @return {!Promise<!Array.<!Common.FormatterWorkerPool.CSSRule>>}
40 */
41 parsePromise(text) {
42 return new Promise(promiseConstructor.bind(this));
43
44 /**
45 * @param {function()} succ
46 * @param {function()} fail
47 * @this {SDK.CSSParser}
48 */
49 function promiseConstructor(succ, fail) {
50 this.parse(text, succ);
51 }
52 }
53
54 dispose() {
55 if (this._terminated)
56 return;
57 this._terminated = true;
58 this._runFinishedCallback([]);
59 }
60
61 /**
62 * @return {!Array.<!Common.FormatterWorkerPool.CSSRule>}
63 */
64 rules() {
65 return this._rules;
66 }
67
68 _lock() {
69 console.assert(!this._parsingStyleSheet, 'Received request to parse styleshe et before previous was completed.');
70 this._parsingStyleSheet = true;
71 }
72
73 _unlock() {
74 delete this._parsingStyleSheet;
75 }
76
77 /**
78 * @param {?string} text
79 */
80 _innerParse(text) {
81 this._rules = [];
82 Common.formatterWorkerPool.parseCSS(text || '', this._onRuleChunk.bind(this) );
83 }
84
85 /**
86 * @param {boolean} isLastChunk
87 * @param {!Array.<!Common.FormatterWorkerPool.CSSRule>} rules
88 */
89 _onRuleChunk(isLastChunk, rules) {
90 if (this._terminated)
91 return;
92 this._rules = this._rules.concat(rules);
93 if (isLastChunk)
94 this._onFinishedParsing();
95 this.dispatchEventToListeners(SDK.CSSParser.Events.RulesParsed);
96 }
97
98 _onFinishedParsing() {
99 this._unlock();
100 this._runFinishedCallback(this._rules);
101 }
102
103 /**
104 * @param {!Array<!SDK.CSSRule>} rules
105 */
106 _runFinishedCallback(rules) {
107 var callback = this._finishedCallback;
108 delete this._finishedCallback;
109 if (callback)
110 callback.call(null, rules);
111 }
112 };
113
114 /** @enum {symbol} */
115 SDK.CSSParser.Events = {
116 RulesParsed: Symbol('RulesParsed')
117 };
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