mario@181: /*
mario@181:  * (c) 2003 Mario de Sousa
mario@181:  *
mario@181:  * Offered to the public under the terms of the GNU General Public License
mario@181:  * as published by the Free Software Foundation; either version 2 of the
mario@181:  * License, or (at your option) any later version.
mario@181:  *
mario@181:  * This program is distributed in the hope that it will be useful, but
mario@181:  * WITHOUT ANY WARRANTY; without even the implied warranty of
mario@181:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
mario@181:  * Public License for more details.
mario@181:  *
mario@181:  * This code is made available on the understanding that it will not be
mario@181:  * used in safety-critical situations without a full and competent review.
mario@181:  */
mario@181: 
mario@181: /*
mario@181:  * An IEC 61131-3 IL and ST compiler.
mario@181:  *
mario@181:  * Based on the
mario@181:  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
mario@181:  *
mario@181:  */
mario@181: 
mario@181: /*
mario@181:  * Seperation of type specification and default value constructs
mario@181:  * (for e.g. simple_spec_init_c), into a type specificiation part,
mario@181:  * and a default value part.
mario@181:  */
mario@181: 
mario@181: #include "spec_init_separator.hh"
mario@181: 
mario@181: //#define DEBUG
mario@181: #ifdef DEBUG
mario@181: #define TRACE(classname) printf("\n____%s____\n",classname);
mario@181: #else
mario@181: #define TRACE(classname)
mario@181: #endif
mario@181: 
mario@181: #define ERROR error_exit(__FILE__,__LINE__)
mario@181: /* function defined in main.cc */
mario@181: extern void error_exit(const char *file_name, int line_no);
mario@181: 
mario@181: 
mario@181: spec_init_sperator_c *spec_init_sperator_c::get_class_instance(void) {
mario@181:   if (NULL == class_instance)
mario@181:     class_instance = new spec_init_sperator_c();
mario@181: 
mario@181:   if (NULL == class_instance)
mario@181:     ERROR;
mario@181: 
mario@181:   return class_instance;
mario@181: }
mario@181: 
mario@181:  /* the only two public functions... */
mario@181: symbol_c *spec_init_sperator_c::get_spec(symbol_c *spec_init) {
mario@181:    search_what = search_spec;
mario@181:    return (symbol_c *)spec_init->accept(*get_class_instance());
mario@181: }
mario@181: 
mario@181: symbol_c *spec_init_sperator_c::get_init(symbol_c *spec_init) {
mario@181:    search_what = search_init;
mario@181:    return (symbol_c *)spec_init->accept(*get_class_instance());
mario@181: }
mario@181: 
mario@181: /*******************************************/
mario@181: /* B 1.1 - Letters, digits and identifiers */
mario@181: /*******************************************/
mario@181: // SYM_TOKEN(identifier_c)
mario@181: void *spec_init_sperator_c::visit(identifier_c *symbol) {
mario@181:   TRACE("spec_init_sperator_c::identifier_c");
mario@181:   switch (search_what) {
mario@181:     /* if we ever get called sith a simple identifier_c, then it must be a previously declared type... */
mario@181:     case search_spec: return symbol;
mario@181:     case search_init: return NULL;
mario@181:   }
mario@181:   ERROR; /* should never occur */
mario@181:   return NULL;
mario@181: }
mario@181: 
mario@181: 
mario@181: /********************************/
mario@181: /* B 1.3.3 - Derived data types */
mario@181: /********************************/
mario@181: 
mario@181: /* simple_specification ASSIGN constant */
mario@181: void *spec_init_sperator_c::visit(simple_spec_init_c *symbol) {
mario@181:   TRACE("spec_init_sperator_c::simple_spec_init_c");
mario@181:   switch (search_what) {
mario@181:     case search_spec: return symbol->simple_specification;
mario@181:     case search_init: return symbol->constant;
mario@181:   }
mario@181:   ERROR; /* should never occur */
mario@181:   return NULL;
mario@181: }
mario@181: 
mario@181: /* subrange_specification ASSIGN signed_integer */
mario@181: void *spec_init_sperator_c::visit(subrange_spec_init_c *symbol) {
mario@181:   TRACE("spec_init_sperator_c::subrange_spec_init_c");
mario@181:   switch (search_what) {
mario@181:     case search_spec: return symbol->subrange_specification->accept(*this);
mario@181:     case search_init: return symbol->signed_integer;
mario@181:   }
mario@181:   ERROR; /* should never occur */
mario@181:   return NULL;
mario@181: }
mario@181: 
mario@181: /*  integer_type_name '(' subrange')' */
mario@181: void *spec_init_sperator_c::visit(subrange_specification_c *symbol) {
mario@181:   TRACE("spec_init_sperator_c::subrange_specification_c");
mario@181:   switch (search_what) {
mario@181:     case search_spec: return symbol->integer_type_name;
mario@181:     case search_init: return NULL; /* should never occur */
mario@181:   }
mario@181:   ERROR; /* should never occur */
mario@181:   return NULL;
mario@181: }
mario@181: 
mario@181: /* array_specification [ASSIGN array_initialization} */
mario@181: /* array_initialization may be NULL ! */
mario@181: void *spec_init_sperator_c::visit(array_spec_init_c *symbol) {
mario@181:   TRACE("spec_init_sperator_c::array_spec_init_c");
mario@181:   switch (search_what) {
mario@181:     case search_spec: return symbol->array_specification;
mario@181:     case search_init: return symbol->array_initialization;
mario@181:   }
mario@181:   return NULL;
mario@181: }
mario@181: 
mario@181: /* enumerated_specification ASSIGN enumerated_value */
mario@181: void *spec_init_sperator_c::visit(enumerated_spec_init_c *symbol) {
mario@181:   TRACE("spec_init_sperator_c::enumerated_spec_init_c");
mario@181:   switch (search_what) {
mario@181:     case search_spec: return symbol->enumerated_specification;
mario@181:     case search_init: return symbol->enumerated_value;
mario@181:   }
mario@181:   ERROR; /* should never occur */
mario@181:   return NULL;
mario@181: }
mario@181: 
mario@181: /* structure_type_name ASSIGN structure_initialization */
mario@181: /* structure_initialization may be NULL ! */
mario@181: //SYM_REF2(initialized_structure_c, structure_type_name, structure_initialization)
mario@181: void *spec_init_sperator_c::visit(initialized_structure_c *symbol) {
mario@181:   TRACE("spec_init_sperator_c::initialized_structure_c");
mario@181:   switch (search_what) {
mario@181:     case search_spec: return symbol->structure_type_name;
mario@181:     case search_init: return symbol->structure_initialization;
mario@181:   }
mario@181:   ERROR; /* should never occur */
mario@181:   return NULL;
mario@181: }
mario@181: 
mario@181: 
mario@181: /******************************************/
mario@181: /* B 1.4.3 - Declaration & Initialisation */
mario@181: /******************************************/
mario@181: 
mario@181: /* fb_name_list ':' function_block_type_name ASSIGN structure_initialization */
mario@181: /* structure_initialization -> may be NULL ! */
mario@181: void *spec_init_sperator_c::visit(fb_name_decl_c *symbol) {
mario@181:   TRACE("spec_init_sperator_c::fb_name_decl_c");
mario@181:   switch (search_what) {
mario@181:     case search_spec: return symbol->function_block_type_name;
mario@181:     case search_init: return symbol->structure_initialization;
mario@181:   }
mario@181:   ERROR; /* should never occur */
mario@181:   return NULL;
mario@181: }
mario@181: 
mario@181: spec_init_sperator_c *spec_init_sperator_c ::class_instance = NULL;
mario@181: spec_init_sperator_c::search_what_t spec_init_sperator_c::search_what;