lbessard@70: /*
lbessard@70:  * (c) 2003 Mario de Sousa
lbessard@70:  *
lbessard@70:  * Offered to the public under the terms of the GNU General Public License
lbessard@70:  * as published by the Free Software Foundation; either version 2 of the
lbessard@70:  * License, or (at your option) any later version.
lbessard@70:  *
lbessard@70:  * This program is distributed in the hope that it will be useful, but
lbessard@70:  * WITHOUT ANY WARRANTY; without even the implied warranty of
lbessard@70:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
lbessard@70:  * Public License for more details.
lbessard@70:  *
lbessard@70:  * This code is made available on the understanding that it will not be
lbessard@70:  * used in safety-critical situations without a full and competent review.
lbessard@70:  */
lbessard@70: 
lbessard@70: /*
lbessard@70:  * An IEC 61131-3 IL and ST compiler.
lbessard@70:  *
lbessard@70:  * Based on the
lbessard@70:  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
lbessard@70:  *
lbessard@70:  */
lbessard@70: 
lbessard@70: 
lbessard@70: /*
lbessard@70:  * Seperation of type specification and default value constructs
lbessard@70:  * (for e.g. simple_spec_init_c), into a type specificiation part,
lbessard@70:  * and a default value part.
lbessard@70:  */
lbessard@70: 
lbessard@70: 
lbessard@70: 
lbessard@70: 
lbessard@70: //#include <stdio.h>  /* required for NULL */
lbessard@70: //#include <string>
lbessard@70: //#include <iostream>
lbessard@70: 
lbessard@70: //#include "../../util/symtable.hh"
lbessard@70: 
lbessard@70: 
lbessard@70: 
lbessard@70: 
lbessard@70: 
lbessard@70: 
lbessard@70: 
lbessard@70: class spec_init_sperator_c: public null_visitor_c {
lbessard@70:   private:
lbessard@70:     /* this is a singleton class... */
lbessard@70:     static spec_init_sperator_c *class_instance;
lbessard@70:     static spec_init_sperator_c *get_class_instance(void) {
lbessard@70:       if (NULL == class_instance)
lbessard@70:         class_instance = new spec_init_sperator_c();
lbessard@70: 
lbessard@70:       if (NULL == class_instance)
lbessard@70:         ERROR;
lbessard@70: 
lbessard@70:       return class_instance;
lbessard@70:     }
lbessard@70: 
lbessard@70:   private:
lbessard@70:     typedef enum {search_spec, search_init} search_what_t;
lbessard@70:     static search_what_t search_what;
lbessard@70: 
lbessard@70:   public:
lbessard@70:     /* the only two public functions... */
lbessard@70:     static symbol_c *get_spec(symbol_c *spec_init) {
lbessard@70:       search_what = search_spec;
lbessard@70:       return (symbol_c *)spec_init->accept(*get_class_instance());
lbessard@70:     }
lbessard@70: 
lbessard@70:     static symbol_c *get_init(symbol_c *spec_init) {
lbessard@70:       search_what = search_init;
lbessard@70:       return (symbol_c *)spec_init->accept(*get_class_instance());
lbessard@70:     }
lbessard@70: 
lbessard@70: //  private:
lbessard@70:   public:  /* probably needs to be public so it may be visited... !! */
lbessard@70: 
lbessard@70: 
lbessard@70: /*******************************************/
lbessard@70: /* B 1.1 - Letters, digits and identifiers */
lbessard@70: /*******************************************/
lbessard@70: // SYM_TOKEN(identifier_c)
lbessard@70: void *visit(identifier_c *symbol) {
lbessard@70:   TRACE("spec_init_sperator_c::identifier_c");
lbessard@70:   switch (search_what) {
lbessard@70:     /* if we ever get called sith a simple identifier_c, then it must be a previously declared type... */
lbessard@70:     case search_spec: return symbol;
lbessard@70:     case search_init: return NULL;
lbessard@70:   }
lbessard@70:   ERROR; /* should never occur */
lbessard@70:   return NULL;
lbessard@70: }
lbessard@70: 
lbessard@70: 
lbessard@70: /********************************/
lbessard@70: /* B 1.3.3 - Derived data types */
lbessard@70: /********************************/
lbessard@70: 
lbessard@70: /* simple_specification ASSIGN constant */
lbessard@70: void *visit(simple_spec_init_c *symbol) {
lbessard@70:   TRACE("spec_init_sperator_c::simple_spec_init_c");
lbessard@70:   switch (search_what) {
lbessard@70:     case search_spec: return symbol->simple_specification;
lbessard@70:     case search_init: return symbol->constant;
lbessard@70:   }
lbessard@70:   ERROR; /* should never occur */
lbessard@70:   return NULL;
lbessard@70: }
lbessard@70: 
lbessard@70: /* subrange_specification ASSIGN signed_integer */
lbessard@70: void *visit(subrange_spec_init_c *symbol) {
lbessard@70:   TRACE("spec_init_sperator_c::subrange_spec_init_c");
lbessard@70:   switch (search_what) {
lbessard@70:     case search_spec: return symbol->subrange_specification;
lbessard@70:     case search_init: return symbol->signed_integer;
lbessard@70:   }
lbessard@70:   ERROR; /* should never occur */
lbessard@70:   return NULL;
lbessard@70: }
lbessard@70: 
lbessard@70: /* enumerated_specification ASSIGN enumerated_value */
lbessard@70: void *visit(enumerated_spec_init_c *symbol) {
lbessard@70:   TRACE("spec_init_sperator_c::enumerated_spec_init_c");
lbessard@70:   switch (search_what) {
lbessard@70:     case search_spec: return symbol->enumerated_specification;
lbessard@70:     case search_init: return symbol->enumerated_value;
lbessard@70:   }
lbessard@70:   ERROR; /* should never occur */
lbessard@70:   return NULL;
lbessard@70: }
lbessard@70: 
lbessard@70: /* structure_type_name ASSIGN structure_initialization */
lbessard@70: /* structure_initialization may be NULL ! */
lbessard@70: //SYM_REF2(initialized_structure_c, structure_type_name, structure_initialization)
lbessard@70: void *visit(initialized_structure_c *symbol) {
lbessard@70:   TRACE("spec_init_sperator_c::initialized_structure_c");
lbessard@70:   switch (search_what) {
lbessard@70:     case search_spec: return symbol->structure_type_name;
lbessard@70:     case search_init: return symbol->structure_initialization;
lbessard@70:   }
lbessard@70:   ERROR; /* should never occur */
lbessard@70:   return NULL;
lbessard@70: }
lbessard@70: 
lbessard@70: 
lbessard@70: /******************************************/
lbessard@70: /* B 1.4.3 - Declaration & Initialisation */
lbessard@70: /******************************************/
lbessard@70: 
lbessard@70: /* fb_name_list ':' function_block_type_name ASSIGN structure_initialization */
lbessard@70: /* structure_initialization -> may be NULL ! */
lbessard@70: void *visit(fb_name_decl_c *symbol) {
lbessard@70:   TRACE("spec_init_sperator_c::fb_name_decl_c");
lbessard@70:   switch (search_what) {
lbessard@70:     case search_spec: return symbol->function_block_type_name;
lbessard@70:     case search_init: return symbol->structure_initialization;
lbessard@70:   }
lbessard@70:   ERROR; /* should never occur */
lbessard@70:   return NULL;
lbessard@70: }
lbessard@70: 
lbessard@70: };   /* class spec_init_sperator_c */
lbessard@70: 
lbessard@70: 
lbessard@70: 
lbessard@70: spec_init_sperator_c *spec_init_sperator_c ::class_instance = NULL;
lbessard@70: spec_init_sperator_c::search_what_t spec_init_sperator_c::search_what;