util/dsymtable.hh
author Edouard Tisserant
Wed, 28 May 2014 11:32:09 +0200
changeset 894 39086e324665
parent 723 d475ae61c7f8
child 972 bc90dd4bbf4f
permissions -rwxr-xr-x
merge
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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 that allows duplicate values.
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 *
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 * This is used to create a symbol table of previously defined
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 * functions. Duplicate are allowed since the standard permits function\
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 * overloading in the standard library.
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 */
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#ifndef _DSYMTABLE_HH
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#define _DSYMTABLE_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 dsymtable_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::multimap<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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    const char *symbol_to_string(const symbol_c *symbol);
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  public:
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    dsymtable_c(void) {};
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    void reset(void); /* clear all entries... */
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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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    /* Determine how many entries are associated to key identifier_str */ 
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    /* returns: 0 if no entry is found, 1 if 1 entry is found, ..., n if n entries are found */
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    int count(const char *identifier_str)    {return _base.count(identifier_str);}
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    int count(const symbol_c *symbol)        {return count(symbol_to_string(symbol));}
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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)       {return find_value(symbol_to_string(symbol));}
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    /* Search for an entry associated with identifier_str. Will return end() if not found */
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    iterator find(const char *identifier_str)        {return _base.find(identifier_str);}
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    iterator find(const symbol_c *symbol)            {return find(symbol_to_string(symbol));}
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    /* Search for the first entry associated with (i.e. with key ==) identifier_str. Will return end() if not found (NOTE: end() != end_value()) */
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    iterator lower_bound(const char *identifier_str) {return ((count(identifier_str) == 0)? _base.end() : _base.lower_bound(identifier_str));}
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    iterator lower_bound(const symbol_c *symbol)     {return lower_bound(symbol_to_string(symbol));}
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    /* Search for the first entry with key greater than identifier_str. Will return end() if not found */
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    iterator upper_bound(const char *identifier_str) {return ((count(identifier_str) == 0)? _base.end() : _base.upper_bound(identifier_str));}
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    iterator upper_bound(const symbol_c *symbol)     {return upper_bound(symbol_to_string(symbol));}
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    /* get the value to which an iterator is pointing to... */
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    value_t get_value(const iterator i) {return i->second;}
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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 "dsymtable.cc"
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#endif /*  _DSYMTABLE_HH */