/usr/include/osgEarthSymbology/Expression is in libosgearth-dev 2.7.0+dfsg-2+b3.
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/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
* Copyright 2015 Pelican Mapping
* http://osgearth.org
*
* osgEarth is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>
*/
#ifndef OSGEARTHSYMBOLOGY_EXPRESSION_H
#define OSGEARTHSYMBOLOGY_EXPRESSION_H 1
#include <osgEarthSymbology/Common>
#include <osgEarth/Config>
#include <osgEarth/URI>
#include <osgEarth/GeoData>
#include <osgEarth/TileKey>
namespace osgEarth { namespace Symbology
{
/**
* Simple numeric expression evaluator with variables.
*/
class OSGEARTHSYMBOLOGY_EXPORT NumericExpression
{
public:
typedef std::pair<std::string,unsigned> Variable;
typedef std::vector<Variable> Variables;
public:
NumericExpression() { }
NumericExpression( const Config& conf );
/** Construct a new expression from the infix string. */
NumericExpression( const std::string& expr );
/** Construct a new static expression from a value */
NumericExpression( double staticValue );
/** Copy ctor. */
NumericExpression( const NumericExpression& rhs );
/** dtor */
virtual ~NumericExpression() { }
/** Set the result to a literal value. */
void setLiteral( double staticValue );
/** Access the expression variables. */
const Variables& variables() const { return _vars; }
/** Set the value of a variable. */
void set( const Variable& var, double value );
/** Evaluate the expression. */
double eval() const;
/** Gets the expression string. */
const std::string& expr() const { return _src; }
/** Whether the expression is empty */
bool empty() const { return _src.empty(); }
public:
Config getConfig() const;
void mergeConfig( const Config& conf );
private:
enum Op { OPERAND, VARIABLE, ADD, SUB, MULT, DIV, MOD, MIN, MAX, LPAREN, RPAREN, COMMA }; // in low-high precedence order
typedef std::pair<Op,double> Atom;
typedef std::vector<Atom> AtomVector;
typedef std::stack<Atom> AtomStack;
std::string _src;
AtomVector _rpn;
Variables _vars;
double _value;
bool _dirty;
void init();
};
//--------------------------------------------------------------------
/**
* Simple string expression evaluator with variables.
*/
class OSGEARTHSYMBOLOGY_EXPORT StringExpression
{
public:
typedef std::pair<std::string,unsigned> Variable;
typedef std::vector<Variable> Variables;
public:
StringExpression() { }
StringExpression( const Config& conf );
/** Construct a new expression from the infix string. */
StringExpression( const std::string& expr );
/** Construct an expression from the infix string and a URI context. */
StringExpression( const std::string& expr, const URIContext& uriContext );
/** Copy ctor. */
StringExpression( const StringExpression& rhs );
/** dtor */
virtual ~StringExpression() { }
/** Set the infix expr. */
void setInfix( const std::string& infix );
/** Set the infix expr to a literal string */
void setLiteral( const std::string& value );
/** Access the expression variables. */
const Variables& variables() const { return _vars; }
/** Set the value of a variable. */
void set( const Variable& var, const std::string& value );
/** Set the value of a names variable if it exists */
void set( const std::string& varName, const std::string& value );
/** Evaluate the expression. */
const std::string& eval() const;
/** Gets the expression string. */
const std::string& expr() const { return _src; }
/** Whether the expression is empty */
bool empty() const { return _src.empty(); }
void setURIContext( const URIContext& uriContext ) { _uriContext = uriContext; }
const URIContext& uriContext() const { return _uriContext; }
public:
Config getConfig() const;
void mergeConfig( const Config& conf );
private:
enum Op { OPERAND, VARIABLE }; // in low-high precedence order
typedef std::pair<Op,std::string> Atom;
typedef std::vector<Atom> AtomVector;
std::string _src;
AtomVector _infix;
Variables _vars;
std::string _value;
bool _dirty;
URIContext _uriContext;
void init();
};
} } // namespace osgEarth::Symbology
#endif // OSGEARTHSYMBOLOGY_EXPRESSION_H
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