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diff --git a/kalzium/src/parser.h b/kalzium/src/parser.h
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+/***************************************************************************
+    copyright            : (C) 2005 by Inge Wallin
+    email                : [email protected]
+ ***************************************************************************/
+/***************************************************************************
+ *                                                                         *
+ *   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