Parser.hh

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/*
 
Cadabra: a field-theory motivated computer algebra system.
Copyright (C) 2001-2014  Kasper Peeters <kasper.peeters@phi-sci.com>
 
This program is free software: you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 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
General Public License for more details.
 
You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
*/
 
#pragma once
 
#include <string>
#include <vector>
#include <iostream>
 
#include "Storage.hh"
 
namespace cadabra {

 
    class Parser {
        public:
            Parser();
            Parser(std::shared_ptr<Ex>);
            Parser(std::shared_ptr<Ex>, const std::string&);
 
            void erase();
 
            void remove_empty_nodes();

            void finalise();
            bool string2tree(const std::string& inp);
 
            std::shared_ptr<Ex> tree;
        private:
            Ex::iterator   parts;
            std::u32string str;
 
            enum mode_t { m_skipwhite=0, m_name=1, m_findchildren=2,
                          m_singlecharname=3, m_backslashname=4,
                          m_childgroup=5, m_initialgroup=6, m_verbatim=7, m_property=8
            };
 
            void                   advance(unsigned int& i);
            char32_t               get_token(unsigned int i);
            bool                   is_number(const std::u32string& str) const;
            str_node::bracket_t    is_closing_bracket(const char32_t& br) const;
            str_node::bracket_t    is_opening_bracket(const char32_t& br) const;
            str_node::parent_rel_t is_link(const char32_t& ln) const;
 
            std::vector<mode_t>                 current_mode;
            std::vector<str_node::bracket_t>    current_bracket;
            std::vector<str_node::parent_rel_t> current_parent_rel;
        };
 
    }
 
std::istream& operator>>(std::istream&, cadabra::Parser&);
 
 
//std::ostream& operator<<(std::ostream&, Parser&);