Parametrizable.h

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// kate: replace-tabs off; indent-width 4; indent-mode normal
// vim: ts=4:sw=4:noexpandtab
/*

Copyright (c) 2010--2012,
François Pomerleau and Stephane Magnenat, ASL, ETHZ, Switzerland
You can contact the authors at <f dot pomerleau at gmail dot com> and
<stephane at magnenat dot net>

All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name of the <organization> nor the
      names of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL ETH-ASL BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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*/

#ifndef __POINTMATCHER_PARAMETRIZABLE_H
#define __POINTMATCHER_PARAMETRIZABLE_H

#include <stdexcept>
#include <vector>
#include <map>
#include <set>
#include <string>
#include <boost/lexical_cast.hpp>
#include <limits>


namespace PointMatcherSupport
{   
    template<typename Target>
    inline Target lexical_cast_scalar_to_string(const std::string& arg)
    {
        if (arg == "inf")
            return std::numeric_limits<Target>::infinity();
        else if (arg == "-inf")
            return -std::numeric_limits<Target>::infinity();
        else if (arg == "nan")
            return std::numeric_limits<Target>::quiet_NaN();
        else
            return boost::lexical_cast<Target>(arg);
    }
    
    template<typename Target, typename Source>
    inline Target lexical_cast(const Source& arg)
    {
        return boost::lexical_cast<Target>(arg);
    }
    
    template<>
    inline float lexical_cast(const std::string& arg) { return lexical_cast_scalar_to_string<float>(arg); }
    template<>
    inline double lexical_cast(const std::string& arg) { return lexical_cast_scalar_to_string<double>(arg); }
    
    //
    
    template<typename S>
    std::string toParam(const S& value)
    {
        return lexical_cast<std::string>(value);
    }
    
    struct Parametrizable
    {
        struct InvalidParameter: std::runtime_error
        {
            InvalidParameter(const std::string& reason);
        };
        
        typedef bool(*LexicalComparison)(std::string a, std::string b);
        
        template<typename S>
        static bool Comp(std::string a, std::string b)
        {
            return lexical_cast<S>(a) < lexical_cast<S>(b);
        }
        
        struct ParameterDoc
        {
            std::string name; 
            std::string doc; 
            std::string defaultValue; 
            std::string minValue; 
            std::string maxValue; 
            LexicalComparison comp; 
            
            /*
            This code is beautiful, this code is correct, this code does not work ;-(
            Blame gcc bug 9050 (http://gcc.gnu.org/bugzilla/show_bug.cgi?id=9050), shame
            on them forever and beyond. People being laaaazzzy adopters, I'm forced to use
            something that works on gcc 4.4.
            
            template<typename S>
            ParameterDoc(const std::string& name, const std::string& doc, const S defaultValue, const S minValue, const S maxValue = std::numeric_limits<S>::max());
            template<typename S>
            ParameterDoc(const std::string& name, const std::string& doc, const S defaultValue);
            */
            ParameterDoc(const std::string& name, const std::string& doc, const std::string& defaultValue, const std::string& minValue, const std::string& maxValue, LexicalComparison comp);
            ParameterDoc(const std::string& name, const std::string& doc, const std::string& defaultValue);
            
            friend std::ostream& operator<< (std::ostream& o, const ParameterDoc& p);
        };
        
        struct ParametersDoc : public std::vector<ParameterDoc>
        {
            ParametersDoc(std::initializer_list<ParameterDoc> list);
            ParametersDoc();
            
            friend std::ostream& operator<< (std::ostream& o, const ParametersDoc& p);
        };
        
        /*
        Again, not used because fo gcc bug 9050
        struct Parameter: public std::string
        {
            template<typename S>
            Parameter(const S value);
            Parameter(){}
        };
        */
        typedef std::string Parameter; 
        typedef std::map<std::string, Parameter> Parameters; 
        typedef std::set<std::string> ParametersUsed; 
        
        const std::string className; 
        const ParametersDoc parametersDoc; 
        Parameters parameters; 
        ParametersUsed parametersUsed; 
        
        Parametrizable();
        Parametrizable(const std::string& className, const ParametersDoc paramsDoc, const Parameters& params);
        virtual ~Parametrizable();
        
        std::string getParamValueString(const std::string& paramName);
        
        template<typename S>
        S get(const std::string& paramName) { return lexical_cast<S>(getParamValueString(paramName)); }
        
        friend std::ostream& operator<< (std::ostream& o, const Parametrizable& p) { o << p.parametersDoc; return o; }
    };
} // namespace PointMatcherSupport

#endif // __POINTMATCHER_PARAMETRIZABLE_H