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00001 /******************************************************************************** 00002 * * 00003 * E x p r e s s i o n E v a l u a t o r * 00004 * * 00005 ********************************************************************************* 00006 * Copyright (C) 1998,2006 by Jeroen van der Zijp. All Rights Reserved. * 00007 ********************************************************************************* 00008 * This library is free software; you can redistribute it and/or * 00009 * modify it under the terms of the GNU Lesser General Public * 00010 * License as published by the Free Software Foundation; either * 00011 * version 2.1 of the License, or (at your option) any later version. * 00012 * * 00013 * This library is distributed in the hope that it will be useful, * 00014 * but WITHOUT ANY WARRANTY; without even the implied warranty of * 00015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * 00016 * Lesser General Public License for more details. * 00017 * * 00018 * You should have received a copy of the GNU Lesser General Public * 00019 * License along with this library; if not, write to the Free Software * 00020 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. * 00021 ********************************************************************************* 00022 * $Id: FXExpression.h,v 1.13 2006/03/21 01:41:43 fox Exp $ * 00023 ********************************************************************************/ 00024 #ifndef FXEXPRESSION_H 00025 #define FXEXPRESSION_H 00026 00027 00028 namespace FX { 00029 00030 00031 /// Expression error codes 00032 enum FXExpressionError { 00033 EXPRERR_OK, 00034 EXPRERR_EMPTY, /// Empty input 00035 EXPRERR_MEMORY, /// Out of memory 00036 EXPRERR_PAREN, /// Unmatched parentheses 00037 EXPRERR_TOKEN, /// Illegal token 00038 EXPRERR_COMMA, /// Expected comma 00039 EXPRERR_IDENT /// Unknown identifier 00040 }; 00041 00042 00043 /// Expression 00044 class FXAPI FXExpression { 00045 private: 00046 FXuchar *code; 00047 private: 00048 static const FXuchar initial[]; 00049 static const FXchar *const errors[]; 00050 public: 00051 00052 /// Construct empty expression object 00053 FXExpression(); 00054 00055 /// Copy expression object 00056 FXExpression(const FXExpression& orig); 00057 00058 /// Compile expression; if error is not NULL, error code is returned 00059 FXExpression(const FXchar* expression,const FXchar* variables=NULL,FXExpressionError* error=NULL); 00060 00061 /// Compile expression; if error is not NULL, error code is returned 00062 FXExpression(const FXString& expression,const FXString& variables=FXString::null,FXExpressionError* error=NULL); 00063 00064 /// Assign another expression to this one 00065 FXExpression& operator=(const FXExpression& orig); 00066 00067 /// See if expression is empty 00068 bool empty() const { return (code==initial); } 00069 00070 /// Evaluate expression with given arguments, if any 00071 FXdouble evaluate(const FXdouble *args=NULL); 00072 00073 /// Parse expression, return error code if syntax error is found 00074 FXExpressionError parse(const FXchar* expression,const FXchar* variables=NULL); 00075 00076 /// Parse expression, return error code if syntax error is found 00077 FXExpressionError parse(const FXString& expression,const FXString& variables=FXString::null); 00078 00079 /// Returns error code for given error 00080 static const FXchar* getError(FXExpressionError err){ return errors[err]; } 00081 00082 /// Delete 00083 ~FXExpression(); 00084 }; 00085 00086 } 00087 00088 #endif
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Copyright © 1997-2005 Jeroen van der Zijp
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