laurent@347: /*
laurent@347:  *  matiec - a compiler for the programming languages defined in IEC 61131-3
laurent@347:  *
laurent@347:  *  Copyright (C) 2003-2011  Mario de Sousa (msousa@fe.up.pt)
laurent@347:  *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant
laurent@347:  *
laurent@347:  *  This program is free software: you can redistribute it and/or modify
laurent@347:  *  it under the terms of the GNU General Public License as published by
laurent@347:  *  the Free Software Foundation, either version 3 of the License, or
laurent@347:  *  (at your option) any later version.
laurent@347:  *
laurent@347:  *  This program is distributed in the hope that it will be useful,
laurent@347:  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
laurent@347:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
laurent@347:  *  GNU General Public License for more details.
laurent@347:  *
laurent@347:  *  You should have received a copy of the GNU General Public License
laurent@347:  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
laurent@347:  *
laurent@347:  *
laurent@347:  * This code is made available on the understanding that it will not be
laurent@347:  * used in safety-critical situations without a full and competent review.
laurent@347:  */
laurent@347: 
laurent@347: /*
laurent@347:  * An IEC 61131-3 compiler.
laurent@347:  *
laurent@347:  * Based on the
laurent@347:  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
laurent@347:  *
laurent@347:  */
laurent@347: 
laurent@347: 
laurent@347: /*
laurent@347:  * Case element iterator.
laurent@347:  * Iterate through the elements of a case list.
laurent@347:  *
laurent@347:  * This is part of the 4th stage that generates
laurent@347:  * a c++ source program equivalent to the IL and ST
laurent@347:  * code.
laurent@347:  */
laurent@347: 
laurent@347: /* Given a case_list_c and a type of element, iterate through
laurent@347:  * each element, returning the symbol of each element if from
laurent@347:  * the good type...case_element_iterator_c
laurent@347:  */
laurent@347: 
laurent@347: 
laurent@347: #include "../absyntax/visitor.hh"
laurent@347: 
laurent@347: 
laurent@347: class case_element_iterator_c : public null_visitor_c {
laurent@347:   public:
laurent@347:     /* A type to specify the type of element.
laurent@347:      */
laurent@347:     typedef enum {
laurent@347:       element_single,
laurent@347:       element_subrange,
laurent@347:     } case_element_t ;
laurent@347: 
laurent@347: 
laurent@347:   private:
laurent@377:     /* a pointer to the case_list_c currently being analyzed */
laurent@347:     symbol_c *case_list;
laurent@347:     /* used when called to iterate() for a parameter */
laurent@347:     symbol_c *current_case_element;
laurent@347: 
laurent@347:     /* used to indicate the type of case element on which iterate */
laurent@347:     case_element_t wanted_element_type;
laurent@347: 
laurent@347:   private:
laurent@347:     void* handle_case_element(symbol_c *case_element);
laurent@347: 
laurent@347:     void* iterate_list(list_c *list);
laurent@347: 
laurent@347:   public:
laurent@347:     /* start off at the first case element once again... */
laurent@347:     void reset(void);
laurent@347: 
laurent@377:     /* initialize the iterator object.
laurent@377:      * We must be given a reference to a case_list_c that will be analyzed...
laurent@347:      */
laurent@347:     case_element_iterator_c(symbol_c *list, case_element_t element_type);
laurent@347: 
laurent@347:     /* Skip to the next case element of type chosen. After object creation,
laurent@347:      * the object references on case element _before_ the first, so
laurent@347:      * this function must be called once to get the object to
laurent@347:      * reference the first element...
laurent@347:      *
laurent@347:      * Returns the case element's symbol!
laurent@347:      */
laurent@347:     symbol_c *next(void);
laurent@347: 
laurent@347:     private:
laurent@347:     
laurent@347:     /******************************/
laurent@347:     /* B 1.2.1 - Numeric Literals */
laurent@347:     /******************************/
laurent@347:     void *visit(integer_c *symbol);
laurent@347:     void *visit(neg_integer_c *symbol);
laurent@347: 
laurent@347:     /********************************/
laurent@347:     /* B 1.3.3 - Derived data types */
laurent@347:     /********************************/
laurent@347:     /*  signed_integer DOTDOT signed_integer */
laurent@347:     void *visit(subrange_c *symbol);
laurent@347: 
laurent@347:     /* enumerated_type_name '#' identifier */
laurent@347:     void *visit(enumerated_value_c *symbol);
laurent@347: 
laurent@347:     /********************************/
laurent@347:     /* B 3.2.3 Selection Statements */
laurent@347:     /********************************/
laurent@347:     void *visit(case_list_c *symbol);
laurent@347: 
laurent@347:     
laurent@347: 
laurent@347: }; // function_param_iterator_c
laurent@347: 
laurent@347: 
laurent@347: 
laurent@347: 
laurent@347: 
laurent@347: 
laurent@347: