osgEarth 2.1.1

/home/cube/sources/osgearth/src/osgEarthSymbology/Expression

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00001 /* -*-c++-*- */
00002 /* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
00003  * Copyright 2008-2010 Pelican Mapping
00004  * http://osgearth.org
00005  *
00006  * osgEarth is free software; you can redistribute it and/or modify
00007  * it under the terms of the GNU Lesser General Public License as published by
00008  * the Free Software Foundation; either version 2 of the License, or
00009  * (at your option) any later version.
00010  *
00011  * This program is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014  * GNU Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public License
00017  * along with this program.  If not, see <http://www.gnu.org/licenses/>
00018  */
00019 
00020 #ifndef OSGEARTHSYMBOLOGY_EXPRESSION_H
00021 #define OSGEARTHSYMBOLOGY_EXPRESSION_H 1
00022 
00023 #include <osgEarthSymbology/Common>
00024 #include <osgEarth/Config>
00025 #include <osgEarth/GeoData>
00026 #include <osgEarth/TileKey>
00027 
00028 namespace osgEarth { namespace Symbology
00029 {    
00033     class OSGEARTHSYMBOLOGY_EXPORT NumericExpression
00034     {
00035     public:
00036         typedef std::pair<std::string,unsigned> Variable;
00037         typedef std::vector<Variable> Variables;
00038 
00039     public:
00040         NumericExpression() { }
00041 
00042         NumericExpression( const Config& conf );
00043 
00045         NumericExpression( const std::string& expr );
00046 
00048         NumericExpression( double staticValue );
00049 
00051         NumericExpression( const NumericExpression& rhs );
00052 
00054         const Variables& variables() const { return _vars; }
00055 
00057         void set( const Variable& var, double value );
00058 
00060         double eval() const;
00061 
00063         const std::string& expr() const { return _src; }
00064 
00066         bool empty() const { return _src.empty(); }
00067 
00068     public:
00069         Config getConfig() const;
00070         void mergeConfig( const Config& conf );
00071 
00072     private:
00073         enum Op { OPERAND, VARIABLE, ADD, SUB, MULT, DIV, MOD, MIN, MAX, LPAREN, RPAREN, COMMA }; // in low-high precedence order
00074         typedef std::pair<Op,double> Atom;
00075         typedef std::vector<Atom> AtomVector;
00076         typedef std::stack<Atom> AtomStack;
00077         
00078         std::string _src;
00079         AtomVector  _rpn;
00080         Variables   _vars;
00081         double      _value;
00082         bool        _dirty;
00083 
00084         void init();
00085     };
00086 
00087     //--------------------------------------------------------------------
00088 
00092     class OSGEARTHSYMBOLOGY_EXPORT StringExpression
00093     {
00094     public:
00095         typedef std::pair<std::string,unsigned> Variable;
00096         typedef std::vector<Variable> Variables;
00097 
00098     public:
00099         StringExpression() { }
00100 
00101         StringExpression( const Config& conf );
00102 
00104         StringExpression( const std::string& expr );
00105 
00107         StringExpression( const StringExpression& rhs );
00108 
00110         const Variables& variables() const { return _vars; }
00111 
00113         void set( const Variable& var, const std::string& value );
00114 
00116         const std::string& eval() const;
00117 
00119         const std::string& expr() const { return _src; }
00120 
00122         bool empty() const { return _src.empty(); }
00123 
00124         void setURIContext( const URIContext& uriContext ) { _uriContext = uriContext; }
00125         const URIContext& uriContext() const { return _uriContext; }
00126 
00127     public:
00128         Config getConfig() const;
00129         void mergeConfig( const Config& conf );
00130 
00131     private:
00132         enum Op { OPERAND, VARIABLE }; // in low-high precedence order
00133         typedef std::pair<Op,std::string> Atom;
00134         typedef std::vector<Atom> AtomVector;
00135         
00136         std::string  _src;
00137         AtomVector   _infix;
00138         Variables    _vars;
00139         std::string  _value;
00140         bool         _dirty;
00141         URIContext   _uriContext;
00142 
00143         void init();
00144     };
00145 
00146 
00147 
00148 } } // namespace osgEarth::Symbology
00149 
00150 #endif // OSGEARTHSYMBOLOGY_EXPRESSION_H
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