absyntax_utils/case_element_iterator.hh
author mjsousa
Thu, 29 May 2014 12:06:22 +0100
changeset 895 f824bf8e1579
parent 661 f537c3315f83
permissions -rwxr-xr-x
Add error message for invalid datatype of transition condition. Generalize datatype narrowing algorithm for transition conditions.
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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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 * An IEC 61131-3 compiler.
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 *
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 * Based on the
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 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
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 *
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 */
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/*
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 * Case element iterator.
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 * Iterate through the elements of a case list.
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 *
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 * This is part of the 4th stage that generates
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 * a c++ source program equivalent to the IL and ST
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 * code.
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 */
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/* Given a case_list_c and a type of element, iterate through
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 * each element, returning the symbol of each element if from
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 * the good type...case_element_iterator_c
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 */
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#include "../absyntax/visitor.hh"
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class case_element_iterator_c : public null_visitor_c {
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  public:
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    /* A type to specify the type of element.
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     */
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    typedef enum {
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      element_single,
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      element_subrange
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    } case_element_t ;
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  private:
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    /* a pointer to the case_list_c currently being analyzed */
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    symbol_c *case_list;
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    /* used when called to iterate() for a parameter */
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    symbol_c *current_case_element;
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    /* used to indicate the type of case element on which iterate */
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    case_element_t wanted_element_type;
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  private:
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    void* handle_case_element(symbol_c *case_element);
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    void* iterate_list(list_c *list);
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  public:
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    /* start off at the first case element once again... */
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    void reset(void);
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    /* initialize the iterator object.
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     * We must be given a reference to a case_list_c that will be analyzed...
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     */
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    case_element_iterator_c(symbol_c *list, case_element_t element_type);
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    /* Skip to the next case element of type chosen. After object creation,
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     * the object references on case element _before_ the first, so
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     * this function must be called once to get the object to
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     * reference the first element...
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     *
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     * Returns the case element's symbol!
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     */
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    symbol_c *next(void);
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    private:
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    /******************************/
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    /* B 1.2.1 - Numeric Literals */
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    /******************************/
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    void *visit(integer_c *symbol);
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    void *visit(neg_integer_c *symbol);
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    /********************************/
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    /* B 1.3.3 - Derived data types */
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    /********************************/
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    /*  signed_integer DOTDOT signed_integer */
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    void *visit(subrange_c *symbol);
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    /* enumerated_type_name '#' identifier */
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    void *visit(enumerated_value_c *symbol);
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    /********************************/
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    /* B 3.2.3 Selection Statements */
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    /********************************/
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    void *visit(case_list_c *symbol);
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}; // function_param_iterator_c
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