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
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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>
#define BOOST_ASSIGN_MAX_PARAMS 6
#include <boost/assign/list_inserter.hpp>
#include <boost/algorithm/string.hpp>
 
 
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>
        inline Target lexical_cast_scalar_to_string(const char*& arg)
        {
                return lexical_cast_scalar_to_string<Target>(std::string(arg));
        }
 
        
        template<typename Target, typename Source>
        inline Target lexical_cast(const Source& arg)
        {
                return boost::lexical_cast<Target>(arg);
        }
 
    template<typename T>
    inline std::vector<T> lexical_cast_vector(const std::string& arg)
    {
        std::string cleanedInput = arg;
        if (cleanedInput.find('[') != 0)
        {
            throw std::runtime_error("Vector parameter '" + arg + "' must start with '['");
        }
        if (cleanedInput.find(']') != cleanedInput.size()-1)
        {
            throw std::runtime_error("Vector parameter '" + arg + "' must end with ']'");
        }
        cleanedInput.erase(std::remove(cleanedInput.begin(), cleanedInput.end(), '['), cleanedInput.end());
        cleanedInput.erase(std::remove(cleanedInput.begin(), cleanedInput.end(), ' '), cleanedInput.end());
        cleanedInput.erase(std::remove(cleanedInput.begin(), cleanedInput.end(), ']'), cleanedInput.end());
 
        // Split the string into a vector of strings using commas as the delimiter
        std::vector<std::string> tokens;
        boost::algorithm::split(tokens, cleanedInput, boost::algorithm::is_any_of(","));
 
        std::vector<T> result;
        result.reserve(tokens.size());
        for(const auto& token: tokens)
        {
            auto value = lexical_cast_scalar_to_string<T>(token);
            result.push_back(value);
        }
        return result;
    }
        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>
        inline std::string toParam(const S& value)
        {
                return lexical_cast<std::string>(value);
        }
 
    template<typename T>
    inline std::string toParam(const std::vector<T>& input)
    {
        std::ostringstream oss;
        oss << "[";
        std::copy(input.begin(), input.end() - 1,
                  std::ostream_iterator<T>(oss, ", "));
        oss << input.back() << "]";
        return oss.str();
    }
        
        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);
                };
                
                typedef std::vector<ParameterDoc> ParametersDoc;
                
                /*
                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)); }
 
                template<typename T>
                inline std::vector<T> getVector(const std::string& paramName) {return lexical_cast_vector<T>(getParamValueString(paramName)); }
 
                friend std::ostream& operator<< (std::ostream& o, const Parametrizable& p);
        };
        std::ostream& operator<< (std::ostream& o, const Parametrizable::ParametersDoc& p);
} // namespace PointMatcherSupport
 
#endif // __POINTMATCHER_PARAMETRIZABLE_H