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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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 * Separation of type specification and default value constructs

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 * (for e.g. simple_spec_init_c), into a type specificiation part,

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 * and a default value part.

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 */

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

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

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class spec_init_sperator_c: public null_visitor_c {

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  private:

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    /* this is a singleton class... */

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    static spec_init_sperator_c *class_instance;

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    static spec_init_sperator_c *get_class_instance(void);

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  private:

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    typedef enum {search_spec, search_init} search_what_t;

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    static search_what_t search_what;

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  public:

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    /* the only two public functions... */

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    static symbol_c *get_spec(symbol_c *spec_init);

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    static symbol_c *get_init(symbol_c *spec_init);

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  private:

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

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

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

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  // SYM_TOKEN(identifier_c)

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  void *visit(identifier_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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  /* simple_specification ASSIGN constant */

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  void *visit(simple_spec_init_c *symbol);

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  /* subrange_specification ASSIGN signed_integer */

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  void *visit(subrange_spec_init_c *symbol);

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

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  void *visit(subrange_specification_c *symbol);

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  /* array_specification [ASSIGN array_initialization} */

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  /* array_initialization may be NULL ! */

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  void *visit(array_spec_init_c *symbol);

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

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  void *visit(array_specification_c *symbol);

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  /* enumerated_specification ASSIGN enumerated_value */

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  void *visit(enumerated_spec_init_c *symbol);

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  /* structure_type_name ASSIGN structure_initialization */

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  /* structure_initialization may be NULL ! */

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  //SYM_REF2(initialized_structure_c, structure_type_name, structure_initialization)

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  void *visit(initialized_structure_c *symbol);

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  /*  function_block_type_name ASSIGN structure_initialization */

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  /* structure_initialization -> may be NULL ! */

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  //SYM_REF2(fb_spec_init_c, function_block_type_name, structure_initialization)

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  void *visit(fb_spec_init_c *symbol);

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  /* REF_TO (non_generic_type_name | function_block_type_name) */

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  // SYM_REF1(ref_spec_c, type_name)

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  void *visit(ref_spec_c *symbol);

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  /* ref_spec [ ASSIGN ref_initialization ] */ 

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  /* NOTE: ref_initialization may be NULL!! */

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  // SYM_REF2(ref_spec_init_c, ref_spec, ref_initialization)

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  void *visit(ref_spec_init_c *symbol);

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

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  /* B 1.4.3 - Declaration & Initialisation */

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

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  /* STRING '[' integer ']' 

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   * STRING ASSIGN single_byte_character_string

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   * STRING '[' integer ']' ASSIGN single_byte_character_string

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   */

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  void *visit(single_byte_string_spec_c *symbol);

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  /* WSTRING '[' integer ']' 

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   * WSTRING ASSIGN double_byte_character_string

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   * WSTRING '[' integer ']' ASSIGN double_byte_character_string

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   */

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  void *visit(double_byte_string_spec_c *symbol);

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};   /* class spec_init_sperator_c */