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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:

    67

    68

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);

    76

  return NULL;

    77

}

    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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  }

    92

    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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void *visit(neg_literal_c *symbol) {return print_unary_expression(symbol->exp, "-");}

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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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   222

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;

   328

}

   329

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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);

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  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) {

   352

    s4o.print(" := ");

   353

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

   354

  }

   355

  return NULL;

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}

   357

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/*  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) {

   362

    s4o.print("(");

   363

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

   364

    s4o.print(")");

   365

  }

   366

  return NULL;

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}

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/*  signed_integer DOTDOT signed_integer */

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void *visit(subrange_c *symbol) {

   371

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

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  s4o.print(" .. ");

   373

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

   374

  return NULL;

   375

}

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/*  enumerated_type_name ':' enumerated_spec_init */

   378

void *visit(enumerated_type_declaration_c *symbol) {

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

   380

  s4o.print(" : ");

   381

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

   382

  return NULL;

   383

}

   384

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/* enumerated_specification ASSIGN enumerated_value */

   386

void *visit(enumerated_spec_init_c *symbol) {

   387

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

   388

  if (symbol->enumerated_value != NULL) {

   389

    s4o.print(" := ");

   390

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

   391

  }

   392

  return NULL;

   393

}

   394

   395

/* helper symbol for enumerated_specification->enumerated_spec_init */

   396

/* enumerated_value_list ',' enumerated_value */

   397

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

   398

   399

/* enumerated_type_name '#' identifier */

   400

void *visit(enumerated_value_c *symbol) {

   401

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

   402

  s4o.print("#");

   403

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

   404

  return NULL;

   405

}

   406

   407

/*  identifier ':' array_spec_init */

   408

void *visit(array_type_declaration_c *symbol) {

   409

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

   410

  s4o.print(" : ");

   411

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

   412

  return NULL;

   413

}

   414

   415

/* array_specification [ASSIGN array_initialization} */

   416

/* array_initialization may be NULL ! */

   417

void *visit(array_spec_init_c *symbol) {

   418

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

   419

  if (symbol->array_initialization != NULL) {

   420

    s4o.print(" := ");

   421

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

   422

  }

   423

  return NULL;

   424

}

   425

   426

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

   427

void *visit(array_specification_c *symbol) {

   428

  s4o.print("ARRAY [");

   429

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

   430

  s4o.print("] OF ");

   431

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

   432

  return NULL;

   433

}

   434

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/* helper symbol for array_specification */

   436

/* array_subrange_list ',' subrange */

   437

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

   438

   439

/* helper symbol for array_initialization */

   440

/* array_initial_elements_list ',' array_initial_elements */

   441

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

   442

   443

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

   444

/* array_initial_element may be NULL ! */

   445

void *visit(array_initial_elements_c *symbol) {

   446

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

   447

  s4o.print("(");

   448

  if (symbol->array_initial_element != NULL)

   449

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

   450

  s4o.print(")");

   451

  return NULL;

   452

}

   453

   454

/*  structure_type_name ':' structure_specification */

   455

void *visit(structure_type_declaration_c *symbol) {

   456

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

   457

  s4o.print(" : ");

   458

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

   459

  return NULL;

   460

}

   461

   462

/* structure_type_name ASSIGN structure_initialization */

   463

/* structure_initialization may be NULL ! */

   464

void *visit(initialized_structure_c *symbol) {

   465

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

   466

  if (symbol->structure_initialization != NULL) {

   467

    s4o.print(" := ");

   468

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

   469

  }

   470

  return NULL;

   471

}

   472

   473

/* helper symbol for structure_declaration */

   474

/* structure_declaration:  STRUCT structure_element_declaration_list END_STRUCT */

   475

/* structure_element_declaration_list structure_element_declaration ';' */

   476

void *visit(structure_element_declaration_list_c *symbol) {

   477

  s4o.print("STRUCT\n");

   478

  s4o.indent_right();

   479

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

   480

  s4o.print("END_STRUCT");

   481

  s4o.indent_left();

   482

  return NULL;

   483

}

   484

   485

/*  structure_element_name ':' *_spec_init */

   486

void *visit(structure_element_declaration_c *symbol) {

   487

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

   488

  s4o.print(" : ");

   489

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

   490

  return NULL;

   491

}

   492

   493

/* helper symbol for structure_initialization */

   494

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

   495

/* structure_element_initialization_list ',' structure_element_initialization */

   496

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

   497

   498

/*  structure_element_name ASSIGN value */

   499

void *visit(structure_element_initialization_c *symbol) {

   500

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

   501

  s4o.print(" := ");

   502

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

   503

  return NULL;

   504

}

   505

   506

/*  string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */

   507

void *visit(string_type_declaration_c *symbol) {

   508

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

   509

  s4o.print(" : ");

   510

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

   511

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

   512

  if (symbol->string_type_declaration_init != NULL)

   513

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

   514

  return NULL;

   515

}

   516

   517

   518

   519

   520

   521

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

   522

/* B 1.4 - Variables */

   523

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

   524

void *visit(symbolic_variable_c *symbol) {

   525

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

   526

  return NULL;

   527

}

   528