parameter_list_base.h

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#ifndef PARAMETER_LIST_BASE_H
#define PARAMETER_LIST_BASE_H
#pragma once
/***************************************************************************
 *   Copyright (C) 2007-2013 Mike Kinghan, imk@burroingroingjoing.com      *
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#include "chew.h"
#include <string>
#include <vector>
#include <memory>
#include <stdexcept>

// Forward decl
struct symbol;

namespace innards {

struct parameter_list_base {

        explicit parameter_list_base(size_t n = 0);

        template<class CharSeq>
        explicit parameter_list_base(chewer<CharSeq> & chew)
        : _defect(none),_variadic(false) {
                read(chew);
        }

        parameter_list_base(parameter_list_base const & other)
        :        _params(
                other._params ?
                        new std::vector<std::string>(*other._params) : nullptr),
                _defect(other._defect),
                _variadic(other._variadic){}

        void swap(parameter_list_base & other) {
                std::swap(_params,other._params);
                std::swap(_defect,other._defect);
                std::swap(_variadic,other._variadic);
        }

        parameter_list_base & operator=(parameter_list_base other) {
                swap(other);
                return *this;
        }

        bool operator==(parameter_list_base const & other) const {
                return str() == other.str();
        }

        bool operator!=(parameter_list_base const & other) const {
                return !(*this == other);
        }

        bool well_formed() const {
                return _defect == none;
        }

        bool variadic() const {
                return _variadic;
        }

        size_t size() const {
                return _params ? _params->size() : 0;
        }

        bool null() const {
                return !_params;
        }

        operator bool () const {
                return !null();
        }

        std::string str() const;



    std::vector<std::string>::iterator begin() {
        using namespace std;
        return null() ? vector<string>::iterator() : _params->begin();
    }

    std::vector<std::string>::const_iterator begin() const {
        using namespace std;
        return null() ? vector<string>::const_iterator() : _params->begin();
    }


    std::vector<std::string>::iterator end() {
        using namespace std;
        return null() ? vector<string>::iterator() : _params->end();
    }

    std::vector<std::string>::const_iterator end() const {
        using namespace std;
        return null() ? vector<string>::const_iterator() : _params->end();
    }


    std::string const & at(size_t n) const {
        using namespace std;
        if (!size()) {
            throw out_of_range("Out of range in parameter_list_base::at(size_t)");
        }
        return (*_params)[n];
    }

    std::string & at(size_t n) {
        using namespace std;
        if (!size()) {
            throw out_of_range("Out of range in parameter_list_base::at(size_t)");
        }
        return (*_params)[n];
    }


    std::string const & operator[](size_t n) const {
        return (*_params)[n];
    }

    std::string & operator[](size_t n) {
        return (*_params)[n];
    }


        size_t which(std::string const & str) const;

    template<class CharSeq>
        void read(chewer<CharSeq> & chew);

        template<typename BiIter>
        static std::string make(BiIter first, BiIter last) {
                std::string s(1,'(');
                if (first != last) {
                        auto last_but_one = last;
                        std::advance(last_but_one,-1);
                        for (   ;first != last_but_one; ++first) {
                                s += std::string(*first) + ',';
                        }
                        s += std::string(first);
                }
                s += ')';
                return s;
        }

protected:

        enum defect {
                none,
                empty_param,
                unclosed,
                non_param
        };

        std::shared_ptr<std::vector<std::string>> _params;
        defect _defect;
        bool _variadic;
};

} // namespace innards

#endif //EOF