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nsXMLContentSerializer.h

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 *
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 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
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/*
 * nsIContentSerializer implementation that can be used with an
 * nsIDocumentEncoder to convert an XML DOM to an XML string that
 * could be parsed into more or less the original DOM.
 */

#ifndef nsXMLContentSerializer_h__
#define nsXMLContentSerializer_h__

#include "nsIContentSerializer.h"
#include "nsISupportsUtils.h"
#include "nsCOMPtr.h"
#include "nsVoidArray.h"

class nsIDOMNode;
class nsIAtom;

class nsXMLContentSerializer : public nsIContentSerializer {
 public:
  nsXMLContentSerializer();
  virtual ~nsXMLContentSerializer();

  NS_DECL_ISUPPORTS

  NS_IMETHOD Init(PRUint32 flags, PRUint32 aWrapColumn,
                  const char* aCharSet, PRBool aIsCopying,
                  PRBool aIsWholeDocument);

  NS_IMETHOD AppendText(nsIDOMText* aText, PRInt32 aStartOffset,
                        PRInt32 aEndOffset, nsAString& aStr);

  NS_IMETHOD AppendCDATASection(nsIDOMCDATASection* aCDATASection,
                                PRInt32 aStartOffset, PRInt32 aEndOffset,
                                nsAString& aStr);

  NS_IMETHOD AppendProcessingInstruction(nsIDOMProcessingInstruction* aPI,
                                         PRInt32 aStartOffset,
                                         PRInt32 aEndOffset,
                                         nsAString& aStr);

  NS_IMETHOD AppendComment(nsIDOMComment* aComment, PRInt32 aStartOffset,
                           PRInt32 aEndOffset, nsAString& aStr);
  
  NS_IMETHOD AppendDoctype(nsIDOMDocumentType *aDoctype,
                           nsAString& aStr);

  NS_IMETHOD AppendElementStart(nsIDOMElement *aElement,
                                nsIDOMElement *aOriginalElement,
                                nsAString& aStr);
  
  NS_IMETHOD AppendElementEnd(nsIDOMElement *aElement,
                              nsAString& aStr);

  NS_IMETHOD Flush(nsAString& aStr) { return NS_OK; }

  NS_IMETHOD AppendDocumentStart(nsIDOMDocument *aDocument,
                                 nsAString& aStr);

 protected:
  virtual void AppendToString(const PRUnichar* aStr,
                              PRInt32 aLength,
                              nsAString& aOutputStr);
  virtual void AppendToString(const PRUnichar aChar, nsAString& aOutputStr);
  virtual void AppendToString(const nsAString& aStr,
                              nsAString& aOutputStr,
                              PRBool aTranslateEntities = PR_FALSE,
                              PRBool aIncrColumn = PR_TRUE);
  nsresult AppendTextData(nsIDOMNode* aNode, 
                          PRInt32 aStartOffset,
                          PRInt32 aEndOffset,
                          nsAString& aStr,
                          PRBool aTranslateEntities,
                          PRBool aIncrColumn);
  virtual nsresult PushNameSpaceDecl(const nsAString& aPrefix,
                                     const nsAString& aURI,
                                     nsIDOMElement* aOwner);
  void PopNameSpaceDeclsFor(nsIDOMElement* aOwner);

  /**
   * The problem that ConfirmPrefix fixes is that anyone can insert nodes
   * through the DOM that have a namespace URI and a random or empty or
   * previously existing prefix that's totally unrelated to the prefixes
   * declared at that point through xmlns attributes.  So what ConfirmPrefix
   * does is ensure that we can map aPrefix to the namespace URI aURI (for
   * example, that the prefix is not already mapped to some other namespace).
   * aPrefix will be adjusted, if necessary, so the value of the prefix
   * _after_ this call is what should be serialized.
   * @param aPrefix the prefix that may need adjusting
   * @param aURI the namespace URI we want aPrefix to point to
   * @param aElement the element we're working with (needed for proper default
   *                 namespace handling)
   * @param aIsAttribute PR_TRUE if we're confirming a prefix for an attribute.
   * @return PR_TRUE if we need to push the (prefix, uri) pair on the namespace
   *                 stack (note that this can happen even if the prefix is
   *                 empty).
   */
  PRBool ConfirmPrefix(nsAString& aPrefix,
                       const nsAString& aURI,
                       nsIDOMElement* aElement,
                       PRBool aIsAttribute);
  /**
   * GenerateNewPrefix generates a new prefix and writes it to aPrefix
   */
  void GenerateNewPrefix(nsAString& aPrefix);
  void SerializeAttr(const nsAString& aPrefix,
                     const nsAString& aName,
                     const nsAString& aValue,
                     nsAString& aStr,
                     PRBool aDoEscapeEntities);
  PRBool IsShorthandAttr(const nsIAtom* aAttrName,
                         const nsIAtom* aElementName);

  // Functions to check for newlines that needs to be added between nodes in
  // the root of a document.
  void MaybeAddNewline(nsAString& aStr);
  void MaybeFlagNewline(nsIDOMNode* aNode);

  PRInt32 mPrefixIndex;
  nsVoidArray mNameSpaceStack;

  // The charset that was passed to Init()
  nsCString mCharset;
  
  PRPackedBool mInAttribute;
  PRPackedBool mAddNewline;
};

nsresult
NS_NewXMLContentSerializer(nsIContentSerializer** aSerializer);

#endif 

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