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 * 
 * Redistribution and use in source and binary forms, with or without
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 * met:
 * 1. Redistribution of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
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/* $Id: BeautifierHandlers.H 1086 2010-12-10 13:07:28Z eduardo $ */
/** @file BeautifierHandlers.H
 *  @brief Beautifier Handlers Class
 */

#ifndef __BEAUTIFIER_HANDLERS_H__
#define __BEAUTIFIER_HANDLERS_H__

#include <memory>
#include <string>
#include <vector>

#include <xercesc/sax/HandlerBase.hpp>

#include "libepp_nicbr.H"

using std::auto_ptr;
using std::string;
using std::vector;

XERCES_CPP_NAMESPACE_USE

LIBEPP_NICBR_NS_BEGIN

/// User Data
struct UserData {
	string input_txt;
	string output_txt;
};

/// Beautifier Handlers Class
class BeautifierHandlers : public XERCES_CPP_NAMESPACE_QUALIFIER HandlerBase
{
public:  
	/// Constructor
	/**
	   @param pretty_data The User Data Structure(input and output text) 
	*/
	BeautifierHandlers(UserData *pretty_data);

	/// Destructor 
	~BeautifierHandlers();

	/// Start Element Handler
	/**
	   @param name The name of the starting element 
	   @param attributes The list of attributes of the element
	*/
	void startElement(const XMLCh* const name, AttributeList& attributes);

	/// Characters Handler
	/**
	   @param chars The text of some element 
	   @param length The length of the text
	*/
	void characters(const XMLCh* const chars,
#if XERCES_VERSION_MAJOR == 2
	                const unsigned int length
#else
	                const XMLSize_t length
#endif
	                );

	/// End Element Handler
	/**
	   @param chars The name of the ending element 
	*/
	void endElement(const XMLCh* const chars);

	/// Handle SAXParseException in case of warning
	/**
	   @param SAXParseException The exception caught
	*/
	void warning(const SAXParseException& exc);

	/// Handle SAXParseException in case of error
	/**
	   @param SAXParseException The exception caught
	*/
	void error(const SAXParseException& exc);

	/// Handle SAXParseException in case of fatal error
	/**
	   @param SAXParseException The exception caught
	*/
	void fatalError(const SAXParseException& exc);

private:
	/// Effective characters handling 
	/// The method is necessary because escaped characters generates 
	//  another character event so it is necessary to buffer the characters 
	//  until the end
	void chars_handler();

	/// Transcode XMLCh to std::string
	/**
	   @param to_transcode XMLCh to be transcoded in std::string
	   @return The transcoded std::string
	*/
	string str_transcode(const XMLCh *const to_transcode);

	/// Truncate the text based on the maximum line length
	/**
	   @param line The text to be checked and formatted (if necessary)
	   @return The formatted text
	*/
	string truncate(const string &line);

	/// Remove leading, trailing and nested zeros
	/**
	   @param buffer The text to be trimmed
	*/  
	string alltrim(const string& buffer);

	/// Split one string into several strings separated by a given pattern
	/**
	   @param buffer The original string
	   @param words  The reference to the vector to be fiiled
	   @return The number of words found
	*/
	int split(const string& buffer, vector<string>& words);

	/// Event Type
	enum eventType {
		NONE = 0,
		START = 1,
		CHARACTERS = 2,
		END = 3
	};

	/// The current depth in the XML Tree
	int _depth;

	/// The pointer to the user data(reference to the input and output)
	UserData *_user_data;

	/// Last event 
	eventType _last_event;

	/// Last non-characters event 
	eventType _last_non_chars_event;

	/// String to be printed
	string _to_be_printed;

	/// Number of whitespaces in the Left margin
	int _left_margin;

	/// Current Element Name
	string _element_name;

	/// Truncated text
	bool _truncated_txt;

	/// Tag Margin
	string _tag_margin;

	/// Buffered characters
	string _buffered_chars;
};

LIBEPP_NICBR_NS_END
#endif //__BEAUTIFIER_HANDLERS_H__
