1/*
2 * Copyright (C) 2010 Google, Inc. All Rights Reserved.
3 * Copyright (C) 2010-2017 Apple Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#pragma once
28
29#include "PendingScript.h"
30#include <wtf/Deque.h>
31#include <wtf/WeakPtr.h>
32#include <wtf/text/TextPosition.h>
33
34namespace WebCore {
35
36class Document;
37class Frame;
38class HTMLScriptRunnerHost;
39class ScriptSourceCode;
40
41class HTMLScriptRunner {
42 WTF_MAKE_FAST_ALLOCATED;
43public:
44 HTMLScriptRunner(Document&, HTMLScriptRunnerHost&);
45 ~HTMLScriptRunner();
46
47 void detach();
48
49 // Processes the passed in script and any pending scripts if possible.
50 void execute(Ref<ScriptElement>&&, const TextPosition& scriptStartPosition);
51
52 void executeScriptsWaitingForLoad(PendingScript&);
53 bool hasScriptsWaitingForStylesheets() const { return m_hasScriptsWaitingForStylesheets; }
54 void executeScriptsWaitingForStylesheets();
55 bool executeScriptsWaitingForParsing();
56
57 bool hasParserBlockingScript() const;
58 bool isExecutingScript() const { return !!m_scriptNestingLevel; }
59
60private:
61 Frame* frame() const;
62
63 void executePendingScriptAndDispatchEvent(PendingScript&);
64 void executeParsingBlockingScripts();
65
66 void requestParsingBlockingScript(ScriptElement&);
67 void requestDeferredScript(ScriptElement&);
68
69 void runScript(ScriptElement&, const TextPosition& scriptStartPosition);
70
71 void watchForLoad(PendingScript&);
72 void stopWatchingForLoad(PendingScript&);
73 bool isPendingScriptReady(const PendingScript&);
74
75 WeakPtr<Document> m_document;
76 HTMLScriptRunnerHost& m_host;
77 RefPtr<PendingScript> m_parserBlockingScript;
78 Deque<Ref<PendingScript>> m_scriptsToExecuteAfterParsing; // http://www.whatwg.org/specs/web-apps/current-work/#list-of-scripts-that-will-execute-when-the-document-has-finished-parsing
79 unsigned m_scriptNestingLevel;
80
81 // We only want stylesheet loads to trigger script execution if script
82 // execution is currently stopped due to stylesheet loads, otherwise we'd
83 // cause nested script execution when parsing <style> tags since </style>
84 // tags can cause Document to call executeScriptsWaitingForStylesheets.
85 bool m_hasScriptsWaitingForStylesheets;
86};
87
88} // namespace WebCore
89