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 "PendingScript.h"
30#include <wtf/Deque.h>
31#include <wtf/text/TextPosition.h>
32#include <wtf/PassRefPtr.h>
33
34namespace WebCore {
35
36class CachedResource;
37class CachedScript;
38class Document;
39class Element;
40class Frame;
41class HTMLScriptRunnerHost;
42class ScriptSourceCode;
43
44class HTMLScriptRunner {
45    WTF_MAKE_NONCOPYABLE(HTMLScriptRunner); WTF_MAKE_FAST_ALLOCATED;
46public:
47    static PassOwnPtr<HTMLScriptRunner> create(Document* document, HTMLScriptRunnerHost* host)
48    {
49        return adoptPtr(new HTMLScriptRunner(document, host));
50    }
51    ~HTMLScriptRunner();
52
53    void detach();
54
55    // Processes the passed in script and any pending scripts if possible.
56    bool execute(PassRefPtr<Element> scriptToProcess, const TextPosition1& scriptStartPosition);
57
58    bool executeScriptsWaitingForLoad(CachedResource*);
59    bool hasScriptsWaitingForStylesheets() const { return m_hasScriptsWaitingForStylesheets; }
60    bool executeScriptsWaitingForStylesheets();
61    bool executeScriptsWaitingForParsing();
62
63    bool isExecutingScript() const { return !!m_scriptNestingLevel; }
64
65private:
66    HTMLScriptRunner(Document*, HTMLScriptRunnerHost*);
67
68    Frame* frame() const;
69
70    void executeParsingBlockingScript();
71    void executePendingScriptAndDispatchEvent(PendingScript&);
72    bool haveParsingBlockingScript() const;
73    bool executeParsingBlockingScripts();
74
75    void requestParsingBlockingScript(Element*);
76    void requestDeferredScript(Element*);
77    bool requestPendingScript(PendingScript&, Element*) const;
78
79    void runScript(Element*, const TextPosition1& scriptStartPosition);
80
81    // Helpers for dealing with HTMLScriptRunnerHost
82    void watchForLoad(PendingScript&);
83    void stopWatchingForLoad(PendingScript&);
84    bool isPendingScriptReady(const PendingScript&);
85    ScriptSourceCode sourceFromPendingScript(const PendingScript&, bool& errorOccurred) const;
86
87    Document* m_document;
88    HTMLScriptRunnerHost* m_host;
89    PendingScript m_parsingBlockingScript;
90    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
91    unsigned m_scriptNestingLevel;
92
93    // We only want stylesheet loads to trigger script execution if script
94    // execution is currently stopped due to stylesheet loads, otherwise we'd
95    // cause nested script execution when parsing <style> tags since </style>
96    // tags can cause Document to call executeScriptsWaitingForStylesheets.
97    bool m_hasScriptsWaitingForStylesheets;
98};
99
100}
101
102#endif
103