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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
commite9ae80694875f869892f13f4fcaf1170a00dea41 (patch)
treeaa2f8d8a217e2d376224c8d46b7397b68d35de2d /kommander/widget/expression.h
downloadtdewebdev-e9ae80694875f869892f13f4fcaf1170a00dea41.tar.gz
tdewebdev-e9ae80694875f869892f13f4fcaf1170a00dea41.zip
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/kdewebdev@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
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+/***************************************************************************
+ expression.h - Expression parser
+ -------------------
+ copyright : (C) 2004 Michal Rudolf <mrudolf@kdewebdwev.org>
+
+ ***************************************************************************/
+
+/***************************************************************************
+ * *
+ * 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 _HAVE_EXPRESSION_H_
+#define _HAVE_EXPRESSION_H_
+
+#include <qstring.h>
+#include <qvaluelist.h>
+#include <qvariant.h>
+
+class Expression
+{
+public:
+ Expression();
+ Expression(const QString& expr);
+ /* set string to parse */
+ Expression& operator=(const QString& s);
+ /* calculate value */
+ QVariant value(bool* valid = 0);
+ /* equivalent of setString(s) and value(valid) */
+ QVariant value(const QString& s, bool* valid = 0);
+ /* equivalent of setString(s) and checking if value(valid) is true */
+ bool isTrue(const QString& s, bool* valid = 0);
+private:
+ enum Type {TypeInt, TypeDouble, TypeString};
+ /* parsing function - top-down approach */
+ /* parse terminal (number or string) */
+ QVariant parseNumber();
+ /* parse -x expression */
+ QVariant parseMinus();
+ /* parse (x) expression */
+ QVariant parseBracket();
+ /* parse x*y, x/y and x%y expressions */
+ QVariant parseMultiply();
+ /* parse x+y and x-y expressions */
+ QVariant parseAdd();
+ /* parse !x and (equivalent) not x expressions */
+ QVariant parseNot();
+ /* parse x==y, x<=y, x>=y, x<y and x>y expressions */
+ QVariant parseComparison();
+ /* parse x && y, (equivalent) x and y expressions */
+ QVariant parseAnd();
+ /* parse x || y and (equivalent) x or y expressions */
+ QVariant parseOr();
+ /* starting point of parsing - just call first function above */
+ QVariant parse();
+
+ /* check if we still have next argument */
+ bool validate();
+ /* return next argument to parse or null if there is none */
+ QString next() const;
+ /* set error position for future error reporting */
+ void setError(int pos = -1);
+ /* compare various types of QVariant (strings, floats, ints */
+ int compare(const QVariant v1, const QVariant v2) const;
+ /* return common type for binary operations */
+ Type commonType(const QVariant v1, const QVariant v2) const;
+
+ QValueList<QVariant> m_parts;
+ uint m_start;
+ bool m_error;
+ uint m_errorPosition;
+
+};
+
+#endif
+