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#include "config.h"
27#include "core/dom/ScriptRunner.h"
28
29#include "core/dom/Document.h"
30#include "core/dom/Element.h"
31#include "core/dom/PendingScript.h"
32#include "core/dom/ScriptLoader.h"
33#include "core/fetch/ScriptResource.h"
34
35namespace WebCore {
36
37ScriptRunner::ScriptRunner(Document* document)
38    : m_document(document)
39    , m_timer(this, &ScriptRunner::timerFired)
40{
41    ASSERT(document);
42}
43
44ScriptRunner::~ScriptRunner()
45{
46    for (size_t i = 0; i < m_scriptsToExecuteSoon.size(); ++i)
47        m_document->decrementLoadEventDelayCount();
48    for (size_t i = 0; i < m_scriptsToExecuteInOrder.size(); ++i)
49        m_document->decrementLoadEventDelayCount();
50    for (size_t i = 0; i < m_pendingAsyncScripts.size(); ++i)
51        m_document->decrementLoadEventDelayCount();
52}
53
54void ScriptRunner::queueScriptForExecution(ScriptLoader* scriptLoader, ResourcePtr<ScriptResource> resource, ExecutionType executionType)
55{
56    ASSERT(scriptLoader);
57    ASSERT(resource.get());
58
59    Element* element = scriptLoader->element();
60    ASSERT(element);
61    ASSERT(element->inDocument());
62
63    m_document->incrementLoadEventDelayCount();
64
65    switch (executionType) {
66    case ASYNC_EXECUTION:
67        m_pendingAsyncScripts.add(scriptLoader, PendingScript(element, resource.get()));
68        break;
69
70    case IN_ORDER_EXECUTION:
71        m_scriptsToExecuteInOrder.append(PendingScript(element, resource.get()));
72        break;
73    }
74}
75
76void ScriptRunner::suspend()
77{
78    m_timer.stop();
79}
80
81void ScriptRunner::resume()
82{
83    if (hasPendingScripts())
84        m_timer.startOneShot(0);
85}
86
87void ScriptRunner::notifyScriptReady(ScriptLoader* scriptLoader, ExecutionType executionType)
88{
89    switch (executionType) {
90    case ASYNC_EXECUTION:
91        ASSERT(m_pendingAsyncScripts.contains(scriptLoader));
92        m_scriptsToExecuteSoon.append(m_pendingAsyncScripts.take(scriptLoader));
93        break;
94
95    case IN_ORDER_EXECUTION:
96        ASSERT(!m_scriptsToExecuteInOrder.isEmpty());
97        break;
98    }
99    m_timer.startOneShot(0);
100}
101
102void ScriptRunner::notifyScriptLoadError(ScriptLoader* scriptLoader, ExecutionType executionType)
103{
104    switch (executionType) {
105    case ASYNC_EXECUTION:
106        ASSERT(m_pendingAsyncScripts.contains(scriptLoader));
107        m_pendingAsyncScripts.remove(scriptLoader);
108        m_document->decrementLoadEventDelayCount();
109        break;
110
111    case IN_ORDER_EXECUTION:
112        ASSERT(!m_scriptsToExecuteInOrder.isEmpty());
113        break;
114    }
115}
116
117void ScriptRunner::timerFired(Timer<ScriptRunner>* timer)
118{
119    ASSERT_UNUSED(timer, timer == &m_timer);
120
121    RefPtr<Document> protect(m_document);
122
123    Vector<PendingScript> scripts;
124    scripts.swap(m_scriptsToExecuteSoon);
125
126    size_t numInOrderScriptsToExecute = 0;
127    for (; numInOrderScriptsToExecute < m_scriptsToExecuteInOrder.size() && m_scriptsToExecuteInOrder[numInOrderScriptsToExecute].resource()->isLoaded(); ++numInOrderScriptsToExecute)
128        scripts.append(m_scriptsToExecuteInOrder[numInOrderScriptsToExecute]);
129    if (numInOrderScriptsToExecute)
130        m_scriptsToExecuteInOrder.remove(0, numInOrderScriptsToExecute);
131
132    size_t size = scripts.size();
133    for (size_t i = 0; i < size; ++i) {
134        ScriptResource* resource = scripts[i].resource();
135        RefPtr<Element> element = scripts[i].releaseElementAndClear();
136        toScriptLoaderIfPossible(element.get())->execute(resource);
137        m_document->decrementLoadEventDelayCount();
138    }
139}
140
141}
142