1/*
2 * Copyright (C) 2010 Google, Inc. All Rights Reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef HTMLScriptRunner_h
27#define HTMLScriptRunner_h
28
29#include "core/dom/PendingScript.h"
30#include "core/fetch/ResourceClient.h"
31#include "platform/heap/Handle.h"
32#include "wtf/Deque.h"
33#include "wtf/PassRefPtr.h"
34#include "wtf/text/TextPosition.h"
35
36namespace blink {
37
38class Resource;
39class ScriptResource;
40class Document;
41class Element;
42class LocalFrame;
43class HTMLScriptRunnerHost;
44class ScriptSourceCode;
45
46class HTMLScriptRunner FINAL : public NoBaseWillBeGarbageCollectedFinalized<HTMLScriptRunner>, private ScriptResourceClient {
47    WTF_MAKE_NONCOPYABLE(HTMLScriptRunner); WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
48public:
49    static PassOwnPtrWillBeRawPtr<HTMLScriptRunner> create(Document* document, HTMLScriptRunnerHost* host)
50    {
51        return adoptPtrWillBeNoop(new HTMLScriptRunner(document, host));
52    }
53    ~HTMLScriptRunner();
54
55    void detach();
56
57    // Processes the passed in script and any pending scripts if possible.
58    void execute(PassRefPtrWillBeRawPtr<Element> scriptToProcess, const TextPosition& scriptStartPosition);
59
60    void executeScriptsWaitingForLoad(Resource*);
61    bool hasScriptsWaitingForResources() const { return m_hasScriptsWaitingForResources; }
62    void executeScriptsWaitingForResources();
63    bool executeScriptsWaitingForParsing();
64
65    bool hasParserBlockingScript() const;
66    bool isExecutingScript() const { return !!m_scriptNestingLevel; }
67
68    // ResourceClient
69    virtual void notifyFinished(Resource*) OVERRIDE;
70
71    void trace(Visitor*);
72
73private:
74    HTMLScriptRunner(Document*, HTMLScriptRunnerHost*);
75
76    void executeParsingBlockingScript();
77    void executePendingScriptAndDispatchEvent(PendingScript&, PendingScript::Type);
78    void executeParsingBlockingScripts();
79
80    void requestParsingBlockingScript(Element*);
81    void requestDeferredScript(Element*);
82    bool requestPendingScript(PendingScript&, Element*) const;
83
84    void runScript(Element*, const TextPosition& scriptStartPosition);
85
86    bool isPendingScriptReady(const PendingScript&);
87
88    RawPtrWillBeMember<Document> m_document;
89    RawPtrWillBeMember<HTMLScriptRunnerHost> m_host;
90    PendingScript m_parserBlockingScript;
91    Deque<PendingScript> m_scriptsToExecuteAfterParsing; // http://www.whatwg.org/specs/web-apps/current-work/#list-of-scripts-that-will-execute-when-the-document-has-finished-parsing
92    unsigned m_scriptNestingLevel;
93
94    // We only want stylesheet loads to trigger script execution if script
95    // execution is currently stopped due to stylesheet loads, otherwise we'd
96    // cause nested script execution when parsing <style> tags since </style>
97    // tags can cause Document to call executeScriptsWaitingForResources.
98    bool m_hasScriptsWaitingForResources;
99
100    // For tracking the times between script load and compilation, we need to
101    // know whether a parser blocking script was loaded previously, or whether
102    // it's really loaded when requested.
103    bool m_parserBlockingScriptAlreadyLoaded;
104};
105
106}
107
108#endif
109