/*
 * (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)
 *
 */



/* Returns the function block type declaration
 * of a specific function block instance.
 */



/* Returns the type name of a specific function block
 * instance. This class will search the variable
 * declarations inside the scope given to it
 * searching for the declaration of the function
 * block instance.
 *
 * The class constructor must be given the search scope
 * (function, function block or program within which
 * the function block instance was declared).
 *
 * This class will search the tree from the root given to the
 * constructor. Another option would be to build a symbol table,
 * and search that instead. Building the symbol table would be done
 * while visiting the variable declaration objects in the parse
 * tree. Unfortuantely, generate_c_c does not visit these
 * objects, delegating it to another class. This means that
 * we would need another specialised class just to build the
 * symbol table. We might just as well have a specialised class
 * that searches the tree itself for the relevant info. This
 * class is exactly that...!
 */


class search_fb_instance_decl_c: public search_visitor_c {

  private:
    symbol_c *search_scope;

    symbol_c *search_name;
    symbol_c *current_fb_type_name;

  public:
    search_fb_instance_decl_c(symbol_c *search_scope);
    symbol_c *get_type_name(symbol_c *fb_instance_name);

  public:
  /***************************/
  /* B 0 - Programming Model */
  /***************************/
    void *visit(library_c *symbol);

  /******************************************/
  /* B 1.4.3 - Declaration & Initialisation */
  /******************************************/
  
  /* name_list ':' function_block_type_name ASSIGN structure_initialization */
  /* structure_initialization -> may be NULL ! */
    void *visit(fb_name_decl_c *symbol);
  /* name_list ',' fb_name */
    void *visit(fb_name_list_c *symbol);

  /**************************************/
  /* B.1.5 - Program organization units */
  /**************************************/
  /***********************/
  /* B 1.5.1 - Functions */
  /***********************/
    void *visit(function_declaration_c *symbol);

  /*****************************/
  /* B 1.5.2 - Function Blocks */
  /*****************************/
    void *visit(function_block_declaration_c *symbol);

  /**********************/
  /* B 1.5.3 - Programs */
  /**********************/
    void *visit(program_declaration_c *symbol);
}; // search_fb_instance_decl_c