util/symtable.hh
author Mario de Sousa <msousa@fe.up.pt>
Thu, 04 Oct 2012 14:30:51 +0100
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child 716 eb9aad0c3627
permissions -rwxr-xr-x
Add new get_datatype_info_c (preparing to remove search_expression_type_c)
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/*
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 *  matiec - a compiler for the programming languages defined in IEC 61131-3
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 *
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 *  Copyright (C) 2003-2011  Mario de Sousa (msousa@fe.up.pt)
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 *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant
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 *
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 *  This program is free software: you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 *  the Free Software Foundation, either version 3 of the License, or
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 *  (at your option) any later version.
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 *
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 *  This program is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
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 *
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 *  You should have received a copy of the GNU General Public License
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 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 *
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 *
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 * This code is made available on the understanding that it will not be
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 * used in safety-critical situations without a full and competent review.
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 */
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/*
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 * A generic symbol table.
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 *
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 * This is used to create symbol tables such as a list of
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 * variables currently in scope, a list of previously defined
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 * functions, etc...
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 */
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#ifndef _SYMTABLE_HH
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#define _SYMTABLE_HH
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#include "../absyntax/absyntax.hh"
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#include <map>
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#include <string>
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template<typename value_type, value_type null_value> class symtable_c {
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  /* Case insensitive string compare copied from
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   * "The C++ Programming Language" - 3rd Edition
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   * by Bjarne Stroustrup, ISBN 0201889544.
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   */
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  class nocase_c {
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    public:
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      bool operator() (const std::string& x, const std::string& y) const {
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        std::string::const_iterator ix = x.begin();
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        std::string::const_iterator iy = y.begin();
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        for(; (ix != x.end()) && (iy != y.end()) && (toupper(*ix) == toupper(*iy)); ++ix, ++iy);
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        if (ix == x.end()) return (iy != y.end());
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        if (iy == y.end()) return false;
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        return (toupper(*ix) < toupper(*iy));
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      };
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  };
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  public:
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    typedef value_type value_t;
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  private:
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    /* Comparison between identifiers must ignore case, therefore the use of nocase_c */
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    typedef std::map<std::string, value_t, nocase_c> base_t;
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    base_t _base;
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  public:
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  typedef typename base_t::iterator iterator;
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  typedef typename base_t::const_iterator const_iterator;
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  typedef typename base_t::reverse_iterator reverse_iterator;
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  typedef typename base_t::const_reverse_iterator const_reverse_iterator;
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  private:
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      /* pointer to symbol table of the next inner scope */
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    symtable_c *inner_scope;
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    void reset(void); /* clear all entries... */
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  public:
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    symtable_c(void);
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    void push(void); /* create new inner scope */
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    int  pop(void);  /* clear most inner scope */
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    void set(const char *identifier_str, value_t value);
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    void set(const symbol_c *symbol, value_t value);
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    void insert(const char *identifier_str, value_t value);
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    void insert(const symbol_c *symbol, value_t value);
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    /* Search for an entry. Will return end_value() if not found */
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    value_t end_value(void) {return null_value;}
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    value_t find_value(const char *identifier_str);
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    value_t find_value(const symbol_c *symbol);
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    iterator find(const char *identifier_str) {return _base.find(identifier_str);}
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  /* iterators pointing to beg/end of map... */
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    iterator begin() 			{return _base.begin();}
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    const_iterator begin() const	{return _base.begin();}
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    iterator end()			{return _base.end();}
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    const_iterator end() const 		{return _base.end();}
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    reverse_iterator rbegin()		{return _base.rbegin();}
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    const_reverse_iterator rbegin() const {return _base.rbegin();}
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    reverse_iterator rend() 		{return _base.rend();}
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    const_reverse_iterator rend() const	{return _base.rend();}
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    /* debuging function... */
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    void print(void);
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};
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/* Templates must include the source into the code! */
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#include "symtable.cc"
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#endif /*  _SYMTABLE_HH */