1/*
2    Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
3    Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
4    Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
5    Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
6    Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
7
8    This library is free software; you can redistribute it and/or
9    modify it under the terms of the GNU Library General Public
10    License as published by the Free Software Foundation; either
11    version 2 of the License, or (at your option) any later version.
12
13    This library is distributed in the hope that it will be useful,
14    but WITHOUT ANY WARRANTY; without even the implied warranty of
15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16    Library General Public License for more details.
17
18    You should have received a copy of the GNU Library General Public License
19    along with this library; see the file COPYING.LIB.  If not, write to
20    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
21    Boston, MA 02110-1301, USA.
22
23    This class provides all functionality needed for loading images, style sheets and html
24    pages from the web. It has a memory cache for these objects.
25*/
26
27#include "config.h"
28#include "CachedScript.h"
29
30#include "MemoryCache.h"
31#include "CachedResourceClient.h"
32#include "CachedResourceClientWalker.h"
33#include "SharedBuffer.h"
34#include "TextResourceDecoder.h"
35#include <wtf/Vector.h>
36
37#if USE(JSC)
38#include <parser/SourceProvider.h>
39#endif
40
41namespace WebCore {
42
43CachedScript::CachedScript(const String& url, const String& charset)
44    : CachedResource(url, Script)
45    , m_decoder(TextResourceDecoder::create("application/javascript", charset))
46    , m_decodedDataDeletionTimer(this, &CachedScript::decodedDataDeletionTimerFired)
47{
48    // It's javascript we want.
49    // But some websites think their scripts are <some wrong mimetype here>
50    // and refuse to serve them if we only accept application/x-javascript.
51    setAccept("*/*");
52}
53
54CachedScript::~CachedScript()
55{
56}
57
58void CachedScript::didAddClient(CachedResourceClient* c)
59{
60    if (m_decodedDataDeletionTimer.isActive())
61        m_decodedDataDeletionTimer.stop();
62
63    CachedResource::didAddClient(c);
64}
65
66void CachedScript::allClientsRemoved()
67{
68    if (double interval = memoryCache()->deadDecodedDataDeletionInterval())
69        m_decodedDataDeletionTimer.startOneShot(interval);
70}
71
72void CachedScript::setEncoding(const String& chs)
73{
74    m_decoder->setEncoding(chs, TextResourceDecoder::EncodingFromHTTPHeader);
75}
76
77String CachedScript::encoding() const
78{
79    return m_decoder->encoding().name();
80}
81
82const String& CachedScript::script()
83{
84    ASSERT(!isPurgeable());
85
86    if (!m_script && m_data) {
87        m_script = m_decoder->decode(m_data->data(), encodedSize());
88        m_script += m_decoder->flush();
89        setDecodedSize(m_script.length() * sizeof(UChar));
90    }
91    m_decodedDataDeletionTimer.startOneShot(0);
92
93    return m_script;
94}
95
96void CachedScript::data(PassRefPtr<SharedBuffer> data, bool allDataReceived)
97{
98    if (!allDataReceived)
99        return;
100
101    m_data = data;
102    setEncodedSize(m_data.get() ? m_data->size() : 0);
103    setLoading(false);
104    checkNotify();
105}
106
107void CachedScript::error(CachedResource::Status status)
108{
109    setStatus(status);
110    ASSERT(errorOccurred());
111    setLoading(false);
112    checkNotify();
113}
114
115void CachedScript::destroyDecodedData()
116{
117    m_script = String();
118    unsigned extraSize = 0;
119#if USE(JSC)
120    if (m_sourceProviderCache && m_clients.isEmpty())
121        m_sourceProviderCache->clear();
122
123    extraSize = m_sourceProviderCache ? m_sourceProviderCache->byteSize() : 0;
124#endif
125    setDecodedSize(extraSize);
126    if (!MemoryCache::shouldMakeResourcePurgeableOnEviction() && isSafeToMakePurgeable())
127        makePurgeable(true);
128}
129
130void CachedScript::decodedDataDeletionTimerFired(Timer<CachedScript>*)
131{
132    destroyDecodedData();
133}
134
135#if USE(JSC)
136JSC::SourceProviderCache* CachedScript::sourceProviderCache() const
137{
138    if (!m_sourceProviderCache)
139        m_sourceProviderCache = adoptPtr(new JSC::SourceProviderCache);
140    return m_sourceProviderCache.get();
141}
142
143void CachedScript::sourceProviderCacheSizeChanged(int delta)
144{
145    setDecodedSize(decodedSize() + delta);
146}
147#endif
148
149} // namespace WebCore
150