absyntax_utils/case_element_iterator.cc
author mjsousa
Sun, 14 Dec 2014 19:15:29 +0000
changeset 964 5f4dfe6670da
parent 596 4efb11e44065
child 1041 56ebe2a31b5b
permissions -rwxr-xr-x
Fix bugs introduced in previous commit (once again do constant folding of all literals in type declarations)
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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 "case_element_iterator.hh"
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#include "../main.hh" // required for ERROR() and ERROR_MSG() macros.
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//#define DEBUG
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#ifdef DEBUG
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#define TRACE(classname) printf("\n____%s____\n",classname);
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#else
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#define TRACE(classname)
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#endif
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void* case_element_iterator_c::handle_case_element(symbol_c *case_element) {
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  if (current_case_element == case_element) {
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    current_case_element = NULL;
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  }
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  else if (current_case_element == NULL) {
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	current_case_element = case_element;
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	return case_element;
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  }
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  /* Not found! */
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  return NULL;
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}
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void* case_element_iterator_c::iterate_list(list_c *list) {
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  void *res;
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  for (int i = 0; i < list->n; i++) {
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    res = list->elements[i]->accept(*this);
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    if (res != NULL)
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        return res;
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  }
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  return NULL;
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}
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/* start off at the first case element once again... */
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void case_element_iterator_c::reset(void) {
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  current_case_element = NULL;
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}
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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::case_element_iterator_c(symbol_c *list, case_element_t element_type) {
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  /* do some consistency check... */
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  case_list_c* case_list = dynamic_cast<case_list_c*>(list);
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  if (NULL == case_list) ERROR;
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  /* OK. Now initialize this object... */
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  this->case_list = list;
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  this->wanted_element_type = element_type;
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  reset();
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}
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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 *case_element_iterator_c::next(void) {
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  void *res = case_list->accept(*this);
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  if (res == NULL) 
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    return NULL;
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  return current_case_element;
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}
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/******************************/
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/* B 1.2.1 - Numeric Literals */
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/******************************/
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void *case_element_iterator_c::visit(integer_c *symbol) {
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  switch (wanted_element_type) {
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	case element_single:
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	  return handle_case_element(symbol);
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	  break;
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	default:
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	  break;
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  }
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  return NULL;
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}
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void *case_element_iterator_c::visit(neg_integer_c *symbol) {
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  switch (wanted_element_type) {
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	case element_single:
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	  return handle_case_element(symbol);
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	  break;
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	default:
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	  break;
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  }
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  return NULL;
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}
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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 *case_element_iterator_c::visit(subrange_c *symbol) {
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  switch (wanted_element_type) {
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    case element_subrange:
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      return handle_case_element(symbol);
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      break;
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    default:
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      break;
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  }
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  return NULL;
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}
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/* enumerated_type_name '#' identifier */
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void *case_element_iterator_c::visit(enumerated_value_c *symbol) {
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  switch (wanted_element_type) {
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    case element_single:
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      return handle_case_element(symbol);
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      break;
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    default:
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      break;
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  }
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  return NULL;
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}
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/********************************/
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/* B 3.2.3 Selection Statements */
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/********************************/
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void *case_element_iterator_c::visit(case_list_c *symbol) {
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  return iterate_list(symbol);
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}
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