/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 TRANSFRMX_XML_EVENT_HANDLER_H
#define TRANSFRMX_XML_EVENT_HANDLER_H

#include "txCore.h"
#include "nsAtom.h"

#define kTXNameSpaceURI u"http://www.mozilla.org/TransforMiix"
#define kTXWrapper "transformiix:result"

class txOutputFormat;
namespace mozilla::dom {
class Document;
}  // namespace mozilla::dom

/**
 * An interface for handling XML documents, loosely modeled
 * after Dave Megginson's SAX 1.0 API.
 */

class txAXMLEventHandler {
 public:
  virtual ~txAXMLEventHandler() = default;

  /**
   * Signals to receive the start of an attribute.
   *
   * @param aPrefix the prefix of the attribute
   * @param aLocalName the localname of the attribute
   * @param aLowercaseName the localname of the attribute in lower case
   * @param aNsID the namespace ID of the attribute
   * @param aValue the value of the attribute
   */
  virtual nsresult attribute(nsAtom* aPrefix, nsAtom* aLocalName,
                             nsAtom* aLowercaseLocalName, int32_t aNsID,
                             const nsString& aValue) = 0;

  /**
   * Signals to receive the start of an attribute.
   *
   * @param aPrefix the prefix of the attribute
   * @param aLocalName the localname of the attribute
   * @param aNsID the namespace ID of the attribute
   * @param aValue the value of the attribute
   */
  virtual nsresult attribute(nsAtom* aPrefix, const nsAString& aLocalName,
                             const int32_t aNsID, const nsString& aValue) = 0;

  /**
   * Signals to receive characters.
   *
   * @param aData the characters to receive
   * @param aDOE disable output escaping for these characters
   */
  virtual nsresult characters(const nsAString& aData, bool aDOE) = 0;

  /**
   * Signals to receive data that should be treated as a comment.
   *
   * @param data the comment data to receive
   */
  virtual nsresult comment(const nsString& aData) = 0;

  /**
   * Signals the end of a document. It is an error to call
   * this method more than once.
   */
  virtual nsresult endDocument(nsresult aResult) = 0;

  /**
   * Signals to receive the end of an element.
   */
  virtual nsresult endElement() = 0;

  /**
   * Signals to receive a processing instruction.
   *
   * @param aTarget the target of the processing instruction
   * @param aData the data of the processing instruction
   */
  virtual nsresult processingInstruction(const nsString& aTarget,
                                         const nsString& aData) = 0;

  /**
   * Signals the start of a document.
   */
  virtual nsresult startDocument() = 0;

  /**
   * Signals to receive the start of an element.
   *
   * @param aPrefix the prefix of the element
   * @param aLocalName the localname of the element
   * @param aLowercaseName the localname of the element in lower case
   * @param aNsID the namespace ID of the element
   */
  virtual nsresult startElement(nsAtom* aPrefix, nsAtom* aLocalName,
                                nsAtom* aLowercaseLocalName, int32_t aNsID) = 0;

  /**
   * Signals to receive the start of an element. Can throw
   * NS_ERROR_XSLT_BAD_NODE_NAME if the name is invalid
   *
   * @param aPrefix the prefix of the element
   * @param aLocalName the localname of the element
   * @param aNsID the namespace ID of the element
   */
  virtual nsresult startElement(nsAtom* aPrefix, const nsAString& aLocalName,
                                const int32_t aNsID) = 0;
};

#define TX_DECL_TXAXMLEVENTHANDLER                                          \
  virtual nsresult attribute(nsAtom* aPrefix, nsAtom* aLocalName,           \
                             nsAtom* aLowercaseLocalName, int32_t aNsID,    \
                             const nsString& aValue) override;              \
  virtual nsresult attribute(nsAtom* aPrefix, const nsAString& aLocalName,  \
                             const int32_t aNsID, const nsString& aValue)   \
      override;                                                             \
  virtual nsresult characters(const nsAString& aData, bool aDOE) override;  \
  virtual nsresult comment(const nsString& aData) override;                 \
  virtual nsresult endDocument(nsresult aResult = NS_OK) override;          \
  virtual nsresult endElement() override;                                   \
  virtual nsresult processingInstruction(const nsString& aTarget,           \
                                         const nsString& aData) override;   \
  virtual nsresult startDocument() override;                                \
  virtual nsresult startElement(nsAtom* aPrefix, nsAtom* aLocalName,        \
                                nsAtom* aLowercaseLocalName, int32_t aNsID) \
      override;                                                             \
  virtual nsresult startElement(nsAtom* aPrefix, const nsAString& aName,    \
                                const int32_t aNsID) override;

class txAOutputXMLEventHandler : public txAXMLEventHandler {
 public:
  /**
   * Gets the Mozilla output document
   *
   * @param aDocument the Mozilla output document
   */
  virtual void getOutputDocument(mozilla::dom::Document** aDocument) = 0;
};

#define TX_DECL_TXAOUTPUTXMLEVENTHANDLER \
  virtual void getOutputDocument(mozilla::dom::Document** aDocument) override;

/**
 * Interface used to create the appropriate outputhandler
 */
class txAOutputHandlerFactory {
 public:
  virtual ~txAOutputHandlerFactory() = default;

  /**
   * Creates an outputhandler for the specified format.
   * @param aFromat  format to get handler for
   * @param aHandler outparam. The created handler
   */
  virtual nsresult createHandlerWith(txOutputFormat* aFormat,
                                     txAXMLEventHandler** aHandler) = 0;

  /**
   * Creates an outputhandler for the specified format, with the specified
   * name and namespace for the root element.
   * @param aFromat  format to get handler for
   * @param aName    name of the root element
   * @param aNsID    namespace-id of the root element
   * @param aHandler outparam. The created handler
   */
  virtual nsresult createHandlerWith(txOutputFormat* aFormat,
                                     const nsAString& aName, int32_t aNsID,
                                     txAXMLEventHandler** aHandler) = 0;
};

#define TX_DECL_TXAOUTPUTHANDLERFACTORY                                       \
  nsresult createHandlerWith(txOutputFormat* aFormat,                         \
                             txAXMLEventHandler** aHandler) override;         \
  nsresult createHandlerWith(txOutputFormat* aFormat, const nsAString& aName, \
                             int32_t aNsID, txAXMLEventHandler** aHandler)    \
      override;

#endif