/*
 * (c) 2003 Mario de Sousa
 *
 * Offered to the public under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 * Public License for more details.
 *
 * This code is made available on the understanding that it will not be
 * used in safety-critical situations without a full and competent review.
 */

/*
 * An IEC 61131-3 IL and ST compiler.
 *
 * Based on the
 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
 *
 */


/*
 * Separation of type specification and default value constructs
 * (for e.g. simple_spec_init_c), into a type specificiation part,
 * and a default value part.
 */

#include "../absyntax/absyntax.hh"
#include "../absyntax/visitor.hh"

class spec_init_sperator_c: public null_visitor_c {

  private:
    /* this is a singleton class... */
    static spec_init_sperator_c *class_instance;
    static spec_init_sperator_c *get_class_instance(void);

  private:
    typedef enum {search_spec, search_init} search_what_t;
    static search_what_t search_what;

  public:
    /* the only two public functions... */
    static symbol_c *get_spec(symbol_c *spec_init);

    static symbol_c *get_init(symbol_c *spec_init);


  private:


  /*******************************************/
  /* B 1.1 - Letters, digits and identifiers */
  /*******************************************/
  // SYM_TOKEN(identifier_c)
  void *visit(identifier_c *symbol);
  

  /********************************/
  /* B 1.3.3 - Derived data types */
  /********************************/

  /* simple_specification ASSIGN constant */
  void *visit(simple_spec_init_c *symbol);
  
  /* subrange_specification ASSIGN signed_integer */
  void *visit(subrange_spec_init_c *symbol);
  
  /*  integer_type_name '(' subrange')' */
  void *visit(subrange_specification_c *symbol);
  
  /* array_specification [ASSIGN array_initialization} */
  /* array_initialization may be NULL ! */
  void *visit(array_spec_init_c *symbol);
  
  /* enumerated_specification ASSIGN enumerated_value */
  void *visit(enumerated_spec_init_c *symbol);
  
  /* structure_type_name ASSIGN structure_initialization */
  /* structure_initialization may be NULL ! */
  //SYM_REF2(initialized_structure_c, structure_type_name, structure_initialization)
  void *visit(initialized_structure_c *symbol);
  
  
  /******************************************/
  /* B 1.4.3 - Declaration & Initialisation */
  /******************************************/
  
  /* fb_name_list ':' function_block_type_name ASSIGN structure_initialization */
  /* structure_initialization -> may be NULL ! */
  void *visit(fb_name_decl_c *symbol);
};   /* class spec_init_sperator_c */