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/*

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 * (c) 2003 Mario de Sousa

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 *

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 * Offered to the public under the terms of the GNU General Public License

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 * as published by the Free Software Foundation; either version 2 of the

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 * License, or (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, but

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 * WITHOUT ANY WARRANTY; without even the implied warranty of

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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General

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 * Public License for more details.

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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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    17

/*

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 * An IEC 61131-3 IL and ST 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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    25

    26

/*

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 * Code to be included into the code generated by the 4th stage.

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 *

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 * This is part of the 4th stage that generates

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 * a ST and IL source program equivalent to the IL and ST

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 * code.

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 * This is expected to be used mainly in debuging the syntax

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 * and lexical parser, and as a starting point for other

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 * 4th stages.

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 */

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// #include <stdio.h>  /* required for NULL */

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#include <string>

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#include <iostream>

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#include <sstream>

    46

#include "generate_iec.hh"

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#include "../stage4.hh"

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//class generate_iec_c: public iterator_visitor_c {

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class generate_iec_c: public visitor_c {

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  private:

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    stage4out_c &s4o;

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    60

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  public:

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    generate_iec_c(stage4out_c *s4o_ptr): s4o(*s4o_ptr) {}

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    ~generate_iec_c(void) {}

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  private:

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void *print_token(token_c *token) {

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  return s4o.print(token->value);

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}

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void *print_literal(symbol_c *type, symbol_c *value) {

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  type->accept(*this);

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  s4o.print("#");

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  value->accept(*this);

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  return NULL;

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}

    78

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void *print_list(list_c *list,

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			       std::string pre_elem_str = "",

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			       std::string inter_elem_str = "",

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			       std::string post_elem_str = "") {

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  if (list->n > 0) {

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    s4o.print(pre_elem_str);

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    list->elements[0]->accept(*this);

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  }

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  for(int i = 1; i < list->n; i++) {

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    s4o.print(inter_elem_str);

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    list->elements[i]->accept(*this);

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  }

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    93

  if (list->n > 0)

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    s4o.print(post_elem_str);

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  return NULL;

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}

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void *print_binary_expression(symbol_c *l_exp,

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			      symbol_c *r_exp,

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			      const char *operation) {

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  s4o.print("(");

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  l_exp->accept(*this);

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  s4o.print(operation);

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  r_exp->accept(*this);

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  s4o.print(")");

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  return NULL;

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}

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void *print_unary_expression(symbol_c *exp,

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			     const char *operation) {

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  s4o.print(operation);

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  exp->accept(*this);

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  return NULL;

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}

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  public:

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/***************************/

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/* 2.1.6 Pragmas */

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/***************************/

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void *visit(pragma_c *symbol) {return print_token(symbol);}

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/***************************/

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/* B 0 - Programming Model */

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/***************************/

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void *visit(library_c *symbol) {return print_list(symbol);}

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/*******************************************/

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/* B 1.1 - Letters, digits and identifiers */

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/*******************************************/

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void *visit(identifier_c *symbol) {return print_token(symbol);}

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/*********************/

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/* B 1.2 - Constants */

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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 *visit(real_c *symbol) {return print_token(symbol);}

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void *visit(integer_c *symbol) {return print_token(symbol);}

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void *visit(binary_integer_c *symbol) {return print_token(symbol);}

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void *visit(octal_integer_c *symbol) {return print_token(symbol);}

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void *visit(hex_integer_c *symbol) {return print_token(symbol);}

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void *visit(numeric_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}

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void *visit(integer_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}

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void *visit(real_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}

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void *visit(bit_string_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}

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void *visit(boolean_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}

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/* helper class for boolean_literal_c */

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void *visit(boolean_true_c *symbol) {s4o.print(/*"TRUE"*/"1"); return NULL;}

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void *visit(boolean_false_c *symbol) {s4o.print(/*"FALSE"*/"0"); return NULL;}

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/*******************************/

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/* B.1.2.2   Character Strings */

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/*******************************/

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void *visit(double_byte_character_string_c *symbol) {return print_token(symbol);}

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void *visit(single_byte_character_string_c *symbol) {return print_token(symbol);}

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/***************************/

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/* B 1.2.3 - Time Literals */

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/***************************/

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/************************/

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/* B 1.2.3.1 - Duration */

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/************************/

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void *visit(neg_time_c *symbol) {s4o.print("-"); return NULL;}

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void *visit(duration_c *symbol) {

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  s4o.print("TIME#");

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  if (symbol->neg != NULL)

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    symbol->neg->accept(*this);

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  symbol->interval->accept(*this);

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  return NULL;

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}

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void *visit(fixed_point_c *symbol) {return print_token(symbol);}

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void *visit(days_c *symbol) {

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  symbol->days->accept(*this);

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  s4o.print("d");

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  if (symbol->hours != NULL)

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    symbol->hours->accept(*this);

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  return NULL;

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}

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void *visit(hours_c *symbol) {

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  symbol->hours->accept(*this);

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  s4o.print("h");

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  if (symbol->minutes != NULL)

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    symbol->minutes->accept(*this);

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  return NULL;

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}

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void *visit(minutes_c *symbol) {

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  symbol->minutes->accept(*this);

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  s4o.print("m");

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  if (symbol->seconds != NULL)

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    symbol->seconds->accept(*this);

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  return NULL;

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}

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void *visit(seconds_c *symbol) {

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  symbol->seconds->accept(*this);

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  s4o.print("s");

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  if (symbol->milliseconds != NULL)

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    symbol->milliseconds->accept(*this);

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  return NULL;

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}

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void *visit(milliseconds_c *symbol) {

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  symbol->milliseconds->accept(*this);

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  s4o.print("ms");

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  return NULL;

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}

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/************************************/

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/* B 1.2.3.2 - Time of day and Date */

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/************************************/

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void *visit(time_of_day_c *symbol) {

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  s4o.print("TIME_OF_DAY#");

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  symbol->daytime->accept(*this);

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  return NULL;

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}

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void *visit(daytime_c *symbol) {

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  symbol->day_hour->accept(*this);

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  s4o.print(":");

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  symbol->day_minute->accept(*this);

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  s4o.print(":");

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  symbol->day_second->accept(*this);

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  return NULL;

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}

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void *visit(date_c *symbol) {

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  s4o.print("DATE#");

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  symbol->date_literal->accept(*this);

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  return NULL;

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}

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void *visit(date_literal_c *symbol) {

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  symbol->year->accept(*this);

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  s4o.print("-");

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  symbol->month->accept(*this);

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  s4o.print("-");

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  symbol->day->accept(*this);

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  return NULL;

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}

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void *visit(date_and_time_c *symbol) {

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  s4o.print("DATE_AND_TIME#");

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  symbol->date_literal->accept(*this);

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  s4o.print("-");

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  symbol->daytime->accept(*this);

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  return NULL;

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}

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/***********************************/

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/* B 1.3.1 - Elementary Data Types */

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/***********************************/

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void *visit(time_type_name_c *symbol) {s4o.print("TIME"); return NULL;}

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void *visit(bool_type_name_c *symbol) {s4o.print("BOOL"); return NULL;}

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void *visit(sint_type_name_c *symbol) {s4o.print("SINT"); return NULL;}

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void *visit(int_type_name_c *symbol) {s4o.print("INT"); return NULL;}

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void *visit(dint_type_name_c *symbol) {s4o.print("DINT"); return NULL;}

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void *visit(lint_type_name_c *symbol) {s4o.print("LINT"); return NULL;}

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void *visit(usint_type_name_c *symbol) {s4o.print("USINT"); return NULL;}

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void *visit(uint_type_name_c *symbol) {s4o.print("UINT"); return NULL;}

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void *visit(udint_type_name_c *symbol) {s4o.print("UDINT"); return NULL;}

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void *visit(ulint_type_name_c *symbol) {s4o.print("ULINT"); return NULL;}

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void *visit(real_type_name_c *symbol) {s4o.print("REAL"); return NULL;}

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void *visit(lreal_type_name_c *symbol) {s4o.print("LREAL"); return NULL;}

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void *visit(date_type_name_c *symbol) {s4o.print("DATE"); return NULL;}

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void *visit(tod_type_name_c *symbol) {s4o.print("TOD"); return NULL;}

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void *visit(dt_type_name_c *symbol) {s4o.print("DT"); return NULL;}

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void *visit(byte_type_name_c *symbol) {s4o.print("BYTE"); return NULL;}

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void *visit(word_type_name_c *symbol) {s4o.print("WORD"); return NULL;}

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void *visit(lword_type_name_c *symbol) {s4o.print("LWORD"); return NULL;}

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void *visit(dword_type_name_c *symbol) {s4o.print("DWORD"); return NULL;}

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void *visit(string_type_name_c *symbol) {s4o.print("STRING"); return NULL;}

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void *visit(wstring_type_name_c *symbol) {s4o.print("WSTRING"); return NULL;}

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void *visit(constant_int_type_name_c *symbol) {return NULL;}

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void *visit(constant_real_type_name_c *symbol) {return NULL;}

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/********************************/

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/* B 1.3.3 - Derived data types */

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/********************************/

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/*  TYPE type_declaration_list END_TYPE */

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void *visit(data_type_declaration_c *symbol) {

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  s4o.print("TYPE\n");

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  s4o.indent_right();

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  symbol->type_declaration_list->accept(*this);

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  s4o.indent_left();

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  s4o.print("END_TYPE\n\n\n");

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  return NULL;

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}

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/* helper symbol for data_type_declaration */

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/*| type_declaration_list type_declaration ';' */

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void *visit(type_declaration_list_c *symbol) {

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  return print_list(symbol, s4o.indent_spaces, ";\n" + s4o.indent_spaces, ";\n");

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}

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/*  simple_type_name ':' simple_spec_init */

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void *visit(simple_type_declaration_c *symbol) {

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  symbol->simple_type_name->accept(*this);

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  s4o.print(" : ");

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  symbol->simple_spec_init->accept(*this);

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  return NULL;

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}

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/* simple_specification ASSIGN constant */

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void *visit(simple_spec_init_c *symbol) {

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  symbol->simple_specification->accept(*this);

   331

  if (symbol->constant != NULL) {

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    s4o.print(" := ");

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    symbol->constant->accept(*this);

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  }

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  return NULL;

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}

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/*  subrange_type_name ':' subrange_spec_init */

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void *visit(subrange_type_declaration_c *symbol) {

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  symbol->subrange_type_name->accept(*this);

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  s4o.print(" : ");

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  symbol->subrange_spec_init->accept(*this);

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  return NULL;

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}

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/* subrange_specification ASSIGN signed_integer */

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void *visit(subrange_spec_init_c *symbol) {

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  symbol->subrange_specification->accept(*this);

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  if (symbol->signed_integer != NULL) {

   350

    s4o.print(" := ");

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    symbol->signed_integer->accept(*this);

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  }

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  return NULL;

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}

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   356

/*  integer_type_name '(' subrange')' */

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void *visit(subrange_specification_c *symbol) {

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  symbol->integer_type_name->accept(*this);

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  if (symbol->subrange != NULL) {

   360

    s4o.print("(");

   361

    symbol->subrange->accept(*this);

   362

    s4o.print(")");

   363

  }

   364

  return NULL;

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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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  symbol->lower_limit->accept(*this);

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  s4o.print(" .. ");

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  symbol->upper_limit->accept(*this);

   372

  return NULL;

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}

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/*  enumerated_type_name ':' enumerated_spec_init */

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void *visit(enumerated_type_declaration_c *symbol) {

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  symbol->enumerated_type_name->accept(*this);

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  s4o.print(" : ");

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  symbol->enumerated_spec_init->accept(*this);

   380

  return NULL;

   381

}

   382

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/* enumerated_specification ASSIGN enumerated_value */

   384

void *visit(enumerated_spec_init_c *symbol) {

   385

  symbol->enumerated_specification->accept(*this);

   386

  if (symbol->enumerated_value != NULL) {

   387

    s4o.print(" := ");

   388

    symbol->enumerated_value->accept(*this);

   389

  }

   390

  return NULL;

   391

}

   392

   393

/* helper symbol for enumerated_specification->enumerated_spec_init */

   394

/* enumerated_value_list ',' enumerated_value */

   395

void *visit(enumerated_value_list_c *symbol) {print_list(symbol, "(", ", ", ")"); return NULL;}

   396

   397

/* enumerated_type_name '#' identifier */

   398

void *visit(enumerated_value_c *symbol) {

   399

  symbol->type->accept(*this);

   400

  s4o.print("#");

   401

  symbol->value->accept(*this);

   402

  return NULL;

   403

}

   404

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/*  identifier ':' array_spec_init */

   406

void *visit(array_type_declaration_c *symbol) {

   407

  symbol->identifier->accept(*this);

   408

  s4o.print(" : ");

   409

  symbol->array_spec_init->accept(*this);

   410

  return NULL;

   411

}

   412

   413

/* array_specification [ASSIGN array_initialization} */

   414

/* array_initialization may be NULL ! */

   415

void *visit(array_spec_init_c *symbol) {

   416

  symbol->array_specification->accept(*this);

   417

  if (symbol->array_initialization != NULL) {

   418

    s4o.print(" := ");

   419

    symbol->array_initialization->accept(*this);

   420

  }

   421

  return NULL;

   422

}

   423

   424

/* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */

   425

void *visit(array_specification_c *symbol) {

   426

  s4o.print("ARRAY [");

   427

  symbol->array_subrange_list->accept(*this);

   428

  s4o.print("] OF ");

   429

  symbol->non_generic_type_name->accept(*this);

   430

  return NULL;

   431

}

   432

   433

/* helper symbol for array_specification */

   434

/* array_subrange_list ',' subrange */

   435

void *visit(array_subrange_list_c *symbol) {print_list(symbol, "", ", "); return NULL;}

   436

   437

/* helper symbol for array_initialization */

   438

/* array_initial_elements_list ',' array_initial_elements */

   439

void *visit(array_initial_elements_list_c *symbol) {print_list(symbol, "[", ", ", "]"); return NULL;}

   440

   441

/* integer '(' [array_initial_element] ')' */

   442

/* array_initial_element may be NULL ! */

   443

void *visit(array_initial_elements_c *symbol) {

   444

  symbol->integer->accept(*this);

   445

  s4o.print("(");

   446

  if (symbol->array_initial_element != NULL)

   447

    symbol->array_initial_element->accept(*this);

   448

  s4o.print(")");

   449

  return NULL;

   450

}

   451

   452

/*  structure_type_name ':' structure_specification */

   453

void *visit(structure_type_declaration_c *symbol) {

   454

  symbol->structure_type_name->accept(*this);

   455

  s4o.print(" : ");

   456

  symbol->structure_specification->accept(*this);

   457

  return NULL;

   458

}

   459

   460

/* structure_type_name ASSIGN structure_initialization */

   461

/* structure_initialization may be NULL ! */

   462

void *visit(initialized_structure_c *symbol) {

   463

  symbol->structure_type_name->accept(*this);

   464

  if (symbol->structure_initialization != NULL) {

   465

    s4o.print(" := ");

   466

    symbol->structure_initialization->accept(*this);

   467

  }

   468

  return NULL;

   469

}

   470

   471

/* helper symbol for structure_declaration */

   472

/* structure_declaration:  STRUCT structure_element_declaration_list END_STRUCT */

   473

/* structure_element_declaration_list structure_element_declaration ';' */

   474

void *visit(structure_element_declaration_list_c *symbol) {

   475

  s4o.print("STRUCT\n");

   476

  s4o.indent_right();

   477

  print_list(symbol, s4o.indent_spaces, ";\n" + s4o.indent_spaces, ";\n" + s4o.indent_spaces);

   478

  s4o.print("END_STRUCT");

   479

  s4o.indent_left();

   480

  return NULL;

   481

}

   482

   483

/*  structure_element_name ':' *_spec_init */

   484

void *visit(structure_element_declaration_c *symbol) {

   485

  symbol->structure_element_name->accept(*this);

   486

  s4o.print(" : ");

   487

  symbol->spec_init->accept(*this);

   488

  return NULL;

   489

}

   490

   491

/* helper symbol for structure_initialization */

   492

/* structure_initialization: '(' structure_element_initialization_list ')' */

   493

/* structure_element_initialization_list ',' structure_element_initialization */

   494

void *visit(structure_element_initialization_list_c *symbol) {print_list(symbol, "(", ", ", ")"); return NULL;}

   495

   496

/*  structure_element_name ASSIGN value */

   497

void *visit(structure_element_initialization_c *symbol) {

   498

  symbol->structure_element_name->accept(*this);

   499

  s4o.print(" := ");

   500

  symbol->value->accept(*this);

   501

  return NULL;

   502

}

   503

   504

/*  string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */

   505

void *visit(string_type_declaration_c *symbol) {

   506

  symbol->string_type_name->accept(*this);

   507

  s4o.print(" : ");

   508

  symbol->elementary_string_type_name->accept(*this);

   509

  symbol->string_type_declaration_size->accept(*this);

   510

  if (symbol->string_type_declaration_init != NULL)

   511

    symbol->string_type_declaration_init->accept(*this);

   512

  return NULL;

   513

}

   514

   515

   516

   517

   518

   519

/*********************/

   520

/* B 1.4 - Variables */

   521

/*********************/

   522

void *visit(symbolic_variable_c *symbol) {

   523

  symbol->var_name->accept(*this);

   524

  return NULL;

   525

}

   526

   527

/********************************************/

   528

/* B.1.4.1   Directly Represented Variables */

   529