etisserant@0: /*
etisserant@0:  * (c) 2003 Mario de Sousa
etisserant@0:  *
etisserant@0:  * Offered to the public under the terms of the GNU General Public License
etisserant@0:  * as published by the Free Software Foundation; either version 2 of the
etisserant@0:  * License, or (at your option) any later version.
etisserant@0:  *
etisserant@0:  * This program is distributed in the hope that it will be useful, but
etisserant@0:  * WITHOUT ANY WARRANTY; without even the implied warranty of
etisserant@0:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
etisserant@0:  * Public License for more details.
etisserant@0:  *
etisserant@0:  * This code is made available on the understanding that it will not be
etisserant@0:  * used in safety-critical situations without a full and competent review.
etisserant@0:  */
etisserant@0: 
etisserant@0: /*
etisserant@0:  * An IEC 61131-3 IL and ST compiler.
etisserant@0:  *
etisserant@0:  * Based on the
etisserant@0:  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
etisserant@0:  *
etisserant@0:  */
etisserant@0: 
etisserant@0: 
etisserant@0: /*
etisserant@0:  * A generic symbol table.
etisserant@0:  *
etisserant@0:  * This is used to create symbol tables such as a list of
etisserant@0:  * variables currently in scope, a list of previously defined
etisserant@0:  * functions, etc...
etisserant@0:  */
etisserant@0: 
etisserant@0: 
etisserant@0: 
etisserant@0: #ifndef _SYMTABLE_HH
etisserant@0: #define _SYMTABLE_HH
etisserant@0: 
etisserant@0: #include "../absyntax/absyntax.hh"
etisserant@0: 
etisserant@0: #include <map>
etisserant@0: #include <string>
etisserant@0: 
etisserant@0: 
etisserant@0: 
etisserant@0: 
etisserant@0: template<typename value_type, value_type null_value> class symtable_c {
etisserant@0:   /* Case insensitive string compare copied from
etisserant@0:    * "The C++ Programming Language" - 3rd Edition
etisserant@0:    * by Bjarne Stroustrup, ISBN 0201889544.
etisserant@0:    */
etisserant@0:   class nocase_c {
etisserant@0:     public:
etisserant@0:       bool operator() (const std::string& x, const std::string& y) const {
etisserant@0:         std::string::const_iterator ix = x.begin();
etisserant@0:         std::string::const_iterator iy = y.begin();
etisserant@0: 
etisserant@0:         for(; (ix != x.end()) && (iy != y.end()) && (toupper(*ix) == toupper(*iy)); ++ix, ++iy);
etisserant@0:         if (ix == x.end()) return (iy != y.end());
etisserant@0:         if (iy == y.end()) return false;
etisserant@0:         return (toupper(*ix) < toupper(*iy));
etisserant@0:       };
etisserant@0:   };
etisserant@0: 
etisserant@0:   public:
etisserant@0:     typedef value_type value_t;
etisserant@0: 
etisserant@0:   private:
etisserant@0:     /* Comparison between identifiers must ignore case, therefore the use of nocase_c */
etisserant@0:     typedef std::map<std::string, value_t, nocase_c> base_t;
etisserant@0:     base_t _base;
etisserant@0: 
etisserant@0:   public:
etisserant@0:   typedef typename base_t::iterator iterator;
etisserant@0:   typedef typename base_t::const_iterator const_iterator;
etisserant@0:   typedef typename base_t::reverse_iterator reverse_iterator;
etisserant@0:   typedef typename base_t::const_reverse_iterator const_reverse_iterator;
etisserant@0: 
etisserant@0:   private:
etisserant@0:       /* pointer to symbol table of the next inner scope */
etisserant@0:     symtable_c *inner_scope;
etisserant@0:     void reset(void); /* clear all entries... */
etisserant@0: 
etisserant@0:   public:
etisserant@0:     symtable_c(void);
etisserant@0: 
etisserant@0:     void push(void); /* create new inner scope */
etisserant@0:     int  pop(void);  /* clear most inner scope */
etisserant@0: 
etisserant@0:     void set(const char *identifier_str, value_t value);
etisserant@0:     void set(const symbol_c *symbol, value_t value);
etisserant@0:     void insert(const char *identifier_str, value_t value);
etisserant@0:     void insert(const symbol_c *symbol, value_t value);
etisserant@0: 
etisserant@0:     /* Search for an entry. Will return end_value() if not found */
etisserant@0:     value_t end_value(void) {return null_value;}
etisserant@0:     value_t find_value(const char *identifier_str);
etisserant@0:     value_t find_value(const symbol_c *symbol);
etisserant@0: 
etisserant@0:     iterator find(const char *identifier_str) {return _base.find(identifier_str);}
etisserant@0: 
etisserant@0:   /* iterators pointing to beg/end of map... */
etisserant@0:     iterator begin() 			{return _base.begin();}
etisserant@0:     const_iterator begin() const	{return _base.begin();}
etisserant@0:     iterator end()			{return _base.end();}
etisserant@0:     const_iterator end() const 		{return _base.end();}
etisserant@0:     reverse_iterator rbegin()		{return _base.rbegin();}
etisserant@0:     const_reverse_iterator rbegin() const {return _base.rbegin();}
etisserant@0:     reverse_iterator rend() 		{return _base.rend();}
etisserant@0:     const_reverse_iterator rend() const	{return _base.rend();}
etisserant@0: 
etisserant@0:     /* debuging function... */
etisserant@0:     void print(void);
etisserant@0: };
etisserant@0: 
etisserant@0: 
etisserant@0: 
etisserant@0: /* Templates must include the source into the code! */
etisserant@0: #include "symtable.cc"
etisserant@0: 
etisserant@0: #endif /*  _SYMTABLE_HH */