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authortoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
committertoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
commitce599e4f9f94b4eb00c1b5edb85bce5431ab3df2 (patch)
treed3bb9f5d25a2dc09ca81adecf39621d871534297 /kalzium/src/parser.h
downloadtdeedu-ce599e4f9f94b4eb00c1b5edb85bce5431ab3df2.tar.gz
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Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.
BUG:215923 git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdeedu@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
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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