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      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 COMPUTER, 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 COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     20  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     22  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     23  */
     24 
     25 #include "config.h"
     26 #include "core/html/parser/TextDocumentParser.h"
     27 
     28 #include "core/HTMLNames.h"
     29 #include "core/html/parser/HTMLTreeBuilder.h"
     30 
     31 namespace WebCore {
     32 
     33 using namespace HTMLNames;
     34 
     35 TextDocumentParser::TextDocumentParser(HTMLDocument& document)
     36     : HTMLDocumentParser(document, false)
     37     , m_haveInsertedFakePreElement(false)
     38 {
     39 }
     40 
     41 TextDocumentParser::~TextDocumentParser()
     42 {
     43 }
     44 
     45 void TextDocumentParser::appendBytes(const char* data, size_t length)
     46 {
     47     if (!m_haveInsertedFakePreElement)
     48         insertFakePreElement();
     49     HTMLDocumentParser::appendBytes(data, length);
     50 }
     51 
     52 void TextDocumentParser::insertFakePreElement()
     53 {
     54     // In principle, we should create a specialized tree builder for
     55     // TextDocuments, but instead we re-use the existing HTMLTreeBuilder.
     56     // We create a fake token and give it to the tree builder rather than
     57     // sending fake bytes through the front-end of the parser to avoid
     58     // distrubing the line/column number calculations.
     59     Vector<Attribute> attributes;
     60     attributes.append(Attribute(styleAttr, "word-wrap: break-word; white-space: pre-wrap;"));
     61     AtomicHTMLToken fakePre(HTMLToken::StartTag, preTag.localName(), attributes);
     62     treeBuilder()->constructTree(&fakePre);
     63 
     64     // Normally we would skip the first \n after a <pre> element, but we don't
     65     // want to skip the first \n for text documents!
     66     treeBuilder()->setShouldSkipLeadingNewline(false);
     67 
     68     // Although Text Documents expose a "pre" element in their DOM, they
     69     // act like a <plaintext> tag, so we have to force plaintext mode.
     70     forcePlaintextForTextDocument();
     71 
     72     m_haveInsertedFakePreElement = true;
     73 }
     74 
     75 }
     76