arguments.hpp

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/*
    Copyright (c) 2011-2014 University of Zurich
    
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#ifndef PLLL_INCLUDE_GUARD__ARGUMENTS_HPP
#define PLLL_INCLUDE_GUARD__ARGUMENTS_HPP

#include <map>
#include <set>
#include <list>
#include <string>

namespace plll
{
    namespace helper
    {
        class ArgumentParser
        {
        public:
            class Value
            {
                friend class ArgumentParser;
                
            private:
                enum Type { VT_Empty, VT_Text, VT_Integer, VT_Float };
                
                // VT_Empty is used for arguments of type "--blah". The argument "--blah=" is
                // treated as VT_Text with getText().size() == 0.
                
                std::string d_value;
                Type d_type;
                long d_int;
                double d_float;
                bool d_id_overflow; // d_type is VT_Integer or VT_Float, but value is too large,
                                    // whence d_int/d_float is not meaningful and d_value should be
                                    // used
                
                Value(const std::string & value, std::string & id);
                
            public:
                bool isEmpty() const
                {
                    return d_type == VT_Empty;
                }
                
                bool isText() const
                {
                    return d_type == VT_Text;
                }
                
                const std::string & getText() const
                {
                    return d_value;
                }
                
                bool hasOverflow() const
                {
                    return d_id_overflow;
                }
                
                bool isInteger() const
                {
                    return d_type == VT_Integer;
                }
                
                long getInteger() const
                {
                    return d_int;
                }
                
                bool isFloat() const
                {
                    return d_type == VT_Float;
                }
                
                double getFloat() const
                {
                    return d_float;
                }
            };
            
        private:
            class MapIteratorComparator
            {
            public:
                bool operator() (const std::map<std::string, Value>::const_iterator & A,
                                 const std::map<std::string, Value>::const_iterator & B) const
                {
                    std::less<const Value*> less;
                    return less(&(A->second), &(B->second));
                }
            };
            
            std::map<std::string, Value> d_args;
            std::list<std::string> d_names;
            mutable std::set<std::map<std::string, Value>::const_iterator, MapIteratorComparator> d_unprocessed_args;
            
        public:
            ArgumentParser(int argc, char **argv);
            
            bool hasNoArguments() const
            {
                return d_args.empty() && d_names.empty();
            }
            
            const std::list<std::string> & getNames() const
            {
                return d_names;
            }
            
            const Value * getValue(const std::string & arg) const
            {
                std::map<std::string, Value>::const_iterator i = d_args.find(arg);
                if (i == d_args.end())
                    return NULL;
                else
                {
                    std::set<std::map<std::string, Value>::const_iterator, MapIteratorComparator>::iterator it = d_unprocessed_args.find(i);
                    if (it != d_unprocessed_args.end())
                        d_unprocessed_args.erase(it);
                    return &(i->second);
                }
            }
            
            bool hasUnprocessedArguments() const
            {
                return d_unprocessed_args.size();
            }
            
            template<class Fun>
            void enumerateUnprocessedArguments(Fun f) const
            {
                for (std::set<std::map<std::string, Value>::const_iterator, MapIteratorComparator>::iterator
                         i = d_unprocessed_args.begin(); i != d_unprocessed_args.end(); ++i)
                    f((*i)->first, (*i)->second);
            }
        };
    }
}

#endif