DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Mercurial (dcc6d7a0dc00)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 et tw=78: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef nsHtml5DocumentBuilder_h
#define nsHtml5DocumentBuilder_h

#include "nsContentSink.h"
#include "nsHtml5DocumentMode.h"
#include "nsIDocument.h"
#include "nsIContent.h"

typedef nsIContent* nsIContentPtr;

enum eHtml5FlushState {
  eNotFlushing = 0,  // not flushing
  eInFlush = 1,      // the Flush() method is on the call stack
  eInDocUpdate = 2,  // inside an update batch on the document
  eNotifying = 3     // flushing pending append notifications
};

class nsHtml5DocumentBuilder : public nsContentSink
{
public:
  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(nsHtml5DocumentBuilder,
                                           nsContentSink)

  NS_DECL_ISUPPORTS_INHERITED

  inline void HoldElement(already_AddRefed<nsIContent> aContent)
  {
    *(mOwnedElements.AppendElement()) = aContent;
  }

  nsresult Init(nsIDocument* aDoc, nsIURI* aURI,
                nsISupports* aContainer, nsIChannel* aChannel);

  // Getters and setters for fields from nsContentSink
  nsIDocument* GetDocument()
  {
    return mDocument;
  }

  nsNodeInfoManager* GetNodeInfoManager()
  {
    return mNodeInfoManager;
  }

  /**
   * Marks this parser as broken and tells the stream parser (if any) to
   * terminate.
   *
   * @return aReason for convenience
   */
  virtual nsresult MarkAsBroken(nsresult aReason);

  /**
   * Checks if this parser is broken. Returns a non-NS_OK (i.e. non-0)
   * value if broken.
   */
  inline nsresult IsBroken()
  {
    return mBroken;
  }

  inline void BeginDocUpdate()
  {
    NS_PRECONDITION(mFlushState == eInFlush, "Tried to double-open update.");
    NS_PRECONDITION(mParser, "Started update without parser.");
    mFlushState = eInDocUpdate;
    mDocument->BeginUpdate(UPDATE_CONTENT_MODEL);
  }

  inline void EndDocUpdate()
  {
    NS_PRECONDITION(mFlushState != eNotifying, "mFlushState out of sync");
    if (mFlushState == eInDocUpdate) {
      mFlushState = eInFlush;
      mDocument->EndUpdate(UPDATE_CONTENT_MODEL);
    }
  }

  bool IsInDocUpdate()
  {
    return mFlushState == eInDocUpdate;
  }

  void SetDocumentCharsetAndSource(nsACString& aCharset, int32_t aCharsetSource);

  /**
   * Sets up style sheet load / parse
   */
  void UpdateStyleSheet(nsIContent* aElement);

  void SetDocumentMode(nsHtml5DocumentMode m);

  void SetNodeInfoManager(nsNodeInfoManager* aManager)
  {
    mNodeInfoManager = aManager;
  }

  // nsContentSink methods
  virtual void UpdateChildCounts() override;
  virtual nsresult FlushTags() override;

protected:

  explicit nsHtml5DocumentBuilder(bool aRunsToCompletion);
  virtual ~nsHtml5DocumentBuilder();

protected:
  nsAutoTArray<nsCOMPtr<nsIContent>, 32> mOwnedElements;
  /**
   * Non-NS_OK if this parser should refuse to process any more input.
   * For example, the parser needs to be marked as broken if it drops some
   * input due to a memory allocation failure. In such a case, the whole
   * parser needs to be marked as broken, because some input has been lost
   * and parsing more input could lead to a DOM where pieces of HTML source
   * that weren't supposed to become scripts become scripts.
   *
   * Since NS_OK is actually 0, zeroing operator new takes care of
   * initializing this.
   */
  nsresult                             mBroken;
  eHtml5FlushState                     mFlushState;
};

#endif // nsHtml5DocumentBuilder_h