third_party/WebKit/Source/core/html/parser/TextDocumentParser.cpp

/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
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 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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#include "core/html/parser/TextDocumentParser.h"

#include "core/HTMLNames.h"
#include "core/html/parser/HTMLTreeBuilder.h"
#include "core/html/parser/ParserSynchronizationPolicy.h"

namespace blink {

using namespace HTMLNames;

TextDocumentParser::TextDocumentParser(HTMLDocument& document, ParserSynchronizationPolicy syncPolicy)
    : HTMLDocumentParser(document, false, syncPolicy)
    , m_haveInsertedFakePreElement(false)
{
}

TextDocumentParser::~TextDocumentParser()
{
}

void TextDocumentParser::appendBytes(const char* data, size_t length)
{
    if (!m_haveInsertedFakePreElement)
        insertFakePreElement();
    HTMLDocumentParser::appendBytes(data, length);
}

void TextDocumentParser::insertFakePreElement()
{
    // In principle, we should create a specialized tree builder for
    // TextDocuments, but instead we re-use the existing HTMLTreeBuilder.
    // We create a fake token and give it to the tree builder rather than
    // sending fake bytes through the front-end of the parser to avoid
    // distrubing the line/column number calculations.
    Vector<Attribute> attributes;
    attributes.append(Attribute(styleAttr, "word-wrap: break-word; white-space: pre-wrap;"));
    AtomicHTMLToken fakePre(HTMLToken::StartTag, preTag.localName(), attributes);
    treeBuilder()->constructTree(&fakePre);
    if (isStopped())
        return; // The document could have been detached by an extension while the tree was being constructed.

    // Normally we would skip the first \n after a <pre> element, but we don't
    // want to skip the first \n for text documents!
    treeBuilder()->setShouldSkipLeadingNewline(false);

    // Although Text Documents expose a "pre" element in their DOM, they
    // act like a <plaintext> tag, so we have to force plaintext mode.
    forcePlaintextForTextDocument();

    m_haveInsertedFakePreElement = true;
}

} // namespace blink