2 * Copyright (C) 2000 Peter Kelly (pmk@post.com)
3 * Copyright (C) 2005, 2006 Apple Computer, Inc.
4 * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
5 * Copyright (C) 2010 Google, Inc.
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public License
18 * along with this library; see the file COPYING.LIB. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
24 #ifndef DocumentParser_h
25 #define DocumentParser_h
27 #include "platform/heap/Handle.h"
28 #include "wtf/Forward.h"
29 #include "wtf/RefCounted.h"
34 class DocumentParserClient;
35 class SegmentedString;
36 class ScriptableDocumentParser;
37 class TextResourceDecoder;
39 class DocumentParser : public RefCountedWillBeGarbageCollectedFinalized<DocumentParser> {
41 virtual ~DocumentParser();
42 virtual void trace(Visitor*);
44 virtual ScriptableDocumentParser* asScriptableDocumentParser() { return 0; }
46 // http://www.whatwg.org/specs/web-apps/current-work/#insertion-point
47 virtual bool hasInsertionPoint() { return true; }
49 // insert is used by document.write.
50 virtual void insert(const SegmentedString&) = 0;
52 // The below functions are used by DocumentWriter (the loader).
53 virtual void appendBytes(const char* bytes, size_t length) = 0;
54 virtual bool needsDecoder() const { return false; }
55 virtual void setDecoder(PassOwnPtr<TextResourceDecoder>);
56 virtual TextResourceDecoder* decoder();
57 virtual void setHasAppendedData() { }
59 // pinToMainThread also makes append() not yield before completion of that chunk.
60 virtual void pinToMainThread() { }
62 // FIXME: append() should be private, but DocumentLoader::replaceDocumentWhileExecutingJavaScriptURL uses it for now.
63 // FIXME: This really should take a PassOwnPtr to signify that it expects to take
64 // ownership of the buffer. The parser expects the PassRefPtr to hold the only ref of the StringImpl.
65 virtual void append(PassRefPtr<StringImpl>) = 0;
67 virtual void finish() = 0;
69 // FIXME: processingData() is only used by DocumentLoader::isLoadingInAPISense
70 // and is very unclear as to what it actually means. The LegacyHTMLDocumentParser
71 // used to implement it.
72 virtual bool processingData() const { return false; }
74 // document() will return 0 after detach() is called.
75 Document* document() const { ASSERT(m_document); return m_document; }
77 bool isParsing() const { return m_state == ParsingState; }
78 bool isStopping() const { return m_state == StoppingState; }
79 bool isStopped() const { return m_state >= StoppedState; }
80 bool isDetached() const { return m_state == DetachedState; }
82 // prepareToStop() is used when the EOF token is encountered and parsing is to be
84 virtual void prepareToStopParsing();
86 // stopParsing() is used when a load is canceled/stopped.
87 // stopParsing() is currently different from detach(), but shouldn't be.
88 // It should NOT be ok to call any methods on DocumentParser after either
89 // detach() or stopParsing() but right now only detach() will ASSERT.
90 virtual void stopParsing();
92 // Document is expected to detach the parser before releasing its ref.
93 // After detach, m_document is cleared. The parser will unwind its
94 // callstacks, but not produce any more nodes.
95 // It is impossible for the parser to touch the rest of WebCore after
97 // Oilpan: We don't need to call detach when a Document is destructed.
98 virtual void detach();
100 void setDocumentWasLoadedAsPartOfNavigation() { m_documentWasLoadedAsPartOfNavigation = true; }
101 bool documentWasLoadedAsPartOfNavigation() const { return m_documentWasLoadedAsPartOfNavigation; }
103 // FIXME: The names are not very accurate :(
104 virtual void suspendScheduledTasks();
105 virtual void resumeScheduledTasks();
107 void addClient(DocumentParserClient*);
108 void removeClient(DocumentParserClient*);
111 explicit DocumentParser(Document*);
113 virtual void flush() = 0;
123 bool m_documentWasLoadedAsPartOfNavigation;
125 // Every DocumentParser needs a pointer back to the document.
126 // m_document will be 0 after the parser is stopped.
127 RawPtrWillBeMember<Document> m_document;
129 WillBeHeapHashSet<RawPtrWillBeWeakMember<DocumentParserClient> > m_clients;
134 #endif // DocumentParser_h