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

/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *
 * 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
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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, 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);

  // The document could have been detached by an extension while the
  // tree was being constructed.
  if (isStopped())
    return;

  // 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