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/***************************************************************************
copyright : (C) 2005 by Inge Wallin
email : inge@lysator.liu.se
***************************************************************************/
/***************************************************************************
* *
* This program 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. *
* *
***************************************************************************/
#ifndef PARSER_H
#define PARSER_H
#include <qstring.h>
/**
* This is a general purpose parser originally written by Inge Wallin.
*
* It is intended to be subclassed; see MoleculeParser.
*
* @author Inge Wallin
*/
class Parser {
public:
// All characters are their own token value per default.
static const int INT_TOKEN = 257;
static const int FLOAT_TOKEN = 258;
// Extend this list in your subclass to make a more advanced parser.
Parser();
Parser(const QString& _str);
~Parser();
/**
* Start a new parse.
*/
void start(const QString& _str);
/**
* Peek at the next character;
*/
int nextChar() const { return m_nextChar; }
/**
* Peek at the next token.
*/
int nextToken() const { return m_nextToken; }
/**
* Get the value stored for different types of tokens.
*/
int intVal() const { return m_intVal; }
float floatVal() const { return m_floatVal; }
private:
// Try to parse some special datatypes.
bool parseInt(int *_result);
bool parseSimpleFloat(double *_result);
protected:
/**
* Make the next character the current one.
*/
int getNextChar();
/**
* Make the next non-space character the current one.
*/
int skipWhitespace();
/**
* Fetches the next token.
*/
virtual int getNextToken();
private:
QString m_str;
int m_index;
int m_nextChar;
protected:
// Lexical analysis and token handling. These members need to be
// protected instead of private since we want to be able to
// reimplement getNextToken().
/**
* The next token to be used in the parser.
*/
int m_nextToken;
// Values for the respective token. These could be made into a
// union, but I don't think it is necessary to bother, since they
// are so few and we don't instantiate a lot of copies of the
// parser.
int m_intVal; // Valid if m_nextToken == INT_TOKEN
double m_floatVal; // Valid if m_nextToken == FLOAT_TOKEN
};
#endif
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