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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* saxparser.h
*
* Mon Mar 24 14:40:15 CET 2008
* Copyright 2008 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of Pracro.
*
* Pracro is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Pracro is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Pracro; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#pragma once
#include <string>
#include <map>
#include <expat.h>
typedef std::map< std::string, std::string> attributes_t;
//! This class implements a SAX Parser, utilising the eXpat XML parser library.
//! It uses virtual methods for the callbacks, and transforms tagnames and
//! attributes into C++ values (std::string and std::vector).
class SAXParser
{
public:
//! Constructor.
//! It initialises the eXpat library.
SAXParser();
//! Destructor.
//! It frees the eXpat library resources.
virtual ~SAXParser();
//! Call this method to use the reimplemented readData method for input.
//! The entire document is parsed through this single call.
//! \return An integer with value 0 on success, or 1 on failure.
//! \see int readData(char *data, size_t size)
int parse();
//! Character data callback method.
//! Reimplement this to get character callbacks.
//! This callback might be called several times, if a character block is big.
//! In that cae it might be nessecary to buffer to received bytes.
//! \param data A std::string containing the character data.
virtual void characterData(const std::string &data);
//! Start tag callback mehtod.
//! Reimplement this to get start tag callbacks.
//! It is called each time a new start tag is seen.
//! \param name A std::string containing the tag name.
//! \param attributes A std::map of std::string to std::string containing all
//! attributes for the tag.
virtual void startTag(std::string name, attributes_t &attr);
//! End tag callback mehtod.
//! Reimplement this to get end tag callbacks.
//! It is called each time an end tag is seen.
//! \param name A std::string containing the tag name.
virtual void endTag(std::string name);
//! Error callback method.
//! Reimplement this to handle error messages.
//! A default implementation prints out the current buffer, linenumber and
//! error message to the screen.
//! \param buf A char* containing the current buffer being parsed.
//! \param len A size_t containing the length of the current buffer being
//! parsed.
//! \param error A std::string containing the error message.
//! \param lineno An integer containing the line number on which the error
//! occurred.
virtual void parseError(const char *buf, size_t len, std::string error,
int lineno);
//! Buffer parse method.
//! Use this method to parse an external buffer with xml data.
//! This method can be called several times (ie. in a read loop).
//! \param buf A char* containing the buffer to parse.
//! \param size A size_t comntaining the size of the buffer to parse.
//! \return A boolean with the value true if a complete document has been
//! seen. false otherwise.
//! \see bool parse(char *buf, size_t size)
bool parse(const char *buf, size_t size);
//! Get the number of bytes used from the last buffer.
//! If the buffer parse method is used, and the buffer comes from a stream of
//! xml doxuments, this method can be used to figure out how many bytes from
//! the stream should be replayed, to another parser.
//! \return an integer containing the number of bytes used from the last
//! buffer.
//! \see bool parse(char *buf, size_t size)
unsigned int usedBytes();
// private stuff that needs to be public!
std::string outertag;
bool done;
protected:
//! Read data callback method.
//! This method is used when the parse() method is used.
//! It can be used to connect the parser with eg. a file.
//! \param data A char* containing the buffer to be filled.
//! \param size A size_t containing the maximum number of bytes to be filled
//! (ie. the size of data)
//! \return An integer contaning the actual number of bytes filled. 0 if no
//! more bytes are available.
//! \see int parse()
virtual int readData(char *data, size_t size);
XML_Parser p;
unsigned int bufferbytes;
unsigned int totalbytes;
};
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