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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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 * Seperation 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 "spec_init_separator.hh"

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#include "../main.hh" // required for ERROR() and ERROR_MSG() macros.

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//#define DEBUG

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#ifdef DEBUG

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#define TRACE(classname) printf("\n____%s____\n",classname);

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#else

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#define TRACE(classname)

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#endif

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spec_init_sperator_c *spec_init_sperator_c::get_class_instance(void) {

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  if (NULL == class_instance)

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    class_instance = new spec_init_sperator_c();

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  if (NULL == class_instance)

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    ERROR;

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  return class_instance;

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}

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

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symbol_c *spec_init_sperator_c::get_spec(symbol_c *spec_init) {

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   search_what = search_spec;

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   return (symbol_c *)spec_init->accept(*get_class_instance());

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}

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symbol_c *spec_init_sperator_c::get_init(symbol_c *spec_init) {

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   search_what = search_init;

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   return (symbol_c *)spec_init->accept(*get_class_instance());

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}

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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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/* visitor for identifier_c should no longer be necessary. All references to derived datatypes are now stored in then */

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/* AST using either poutype_identifier_c or derived_datatype_identifier_c                                             */

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void *spec_init_sperator_c::visit(                 identifier_c *symbol) { ERROR; return NULL;} /* should never occur */

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void *spec_init_sperator_c::visit(         poutype_identifier_c *symbol) {

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  TRACE("spec_init_sperator_c::poutype_identifier_c");

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  switch (search_what) {

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    /* if we ever get called sith a simple identifier_c, then it must be a previously declared type... */

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    case search_spec: return symbol;

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    case search_init: return NULL;

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  }

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  ERROR; /* should never occur */

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  return NULL;

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  }

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void *spec_init_sperator_c::visit(derived_datatype_identifier_c *symbol) {

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  TRACE("spec_init_sperator_c::derived_datatype_identifier_c");

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  switch (search_what) {

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    /* if we ever get called sith a simple identifier_c, then it must be a previously declared type... */

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    case search_spec: return symbol;

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    case search_init: return NULL;

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  }

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  ERROR; /* should never occur */

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  return NULL;

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}

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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 *spec_init_sperator_c::visit(simple_spec_init_c *symbol) {

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  TRACE("spec_init_sperator_c::simple_spec_init_c");

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  switch (search_what) {

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    case search_spec: return symbol->simple_specification;

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    case search_init: return symbol->constant;

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  }

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  ERROR; /* should never occur */

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  return NULL;

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}

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/* subrange_specification ASSIGN signed_integer */

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void *spec_init_sperator_c::visit(subrange_spec_init_c *symbol) {

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  TRACE("spec_init_sperator_c::subrange_spec_init_c");

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  switch (search_what) {

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    case search_spec: return symbol->subrange_specification->accept(*this);

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    case search_init: return symbol->signed_integer;

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  }

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  ERROR; /* should never occur */

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  return NULL;

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}

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

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void *spec_init_sperator_c::visit(subrange_specification_c *symbol) {

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  TRACE("spec_init_sperator_c::subrange_specification_c");

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  switch (search_what) {

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    case search_spec: return symbol->integer_type_name;

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    case search_init: return NULL; /* should never occur */

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  }

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  ERROR; /* should never occur */

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  return NULL;

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}

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/* array_specification [ASSIGN array_initialization} */

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/* array_initialization may be NULL ! */

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void *spec_init_sperator_c::visit(array_spec_init_c *symbol) {

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  TRACE("spec_init_sperator_c::array_spec_init_c");

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  switch (search_what) {

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    case search_spec: return symbol->array_specification;

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    case search_init: return symbol->array_initialization;

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  }

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  return NULL;

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}

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

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/* NOTE: this symbol may be used directly in implictly defined variables in VAR_TEMP!! 

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 *       so we must consider it here too!

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 */

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void *spec_init_sperator_c::visit(array_specification_c *symbol) {

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  TRACE("spec_init_sperator_c::array_spec_init_c");

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  switch (search_what) {

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    case search_spec: return symbol;

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    case search_init: return NULL;

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  }

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  return NULL;

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}

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/* enumerated_specification ASSIGN enumerated_value */

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void *spec_init_sperator_c::visit(enumerated_spec_init_c *symbol) {

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  TRACE("spec_init_sperator_c::enumerated_spec_init_c");

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  switch (search_what) {

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    case search_spec: return symbol->enumerated_specification;

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    case search_init: return symbol->enumerated_value;

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  }

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  ERROR; /* should never occur */

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  return NULL;

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}

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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 *spec_init_sperator_c::visit(initialized_structure_c *symbol) {

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  TRACE("spec_init_sperator_c::initialized_structure_c");

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  switch (search_what) {

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    case search_spec: return symbol->structure_type_name;

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    case search_init: return symbol->structure_initialization;

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  }

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  ERROR; /* should never occur */

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  return NULL;

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}

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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 *spec_init_sperator_c::visit(fb_spec_init_c *symbol) {

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  TRACE("spec_init_sperator_c::fb_spec_init_c");

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  switch (search_what) {

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    case search_spec: return symbol->function_block_type_name;

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    case search_init: return symbol->structure_initialization;

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  }

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  ERROR; /* should never occur */

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  return NULL;

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}

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/* ref_spec:  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 *spec_init_sperator_c::visit(ref_spec_c *symbol) {

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  TRACE("spec_init_sperator_c::ref_spec_c");

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  /* This visitor should never really be called, but there is no harm in including it... */

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  switch (search_what) {

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    case search_spec: return symbol;

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    case search_init: return NULL; /* should never occur */

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  }

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  ERROR; /* should never occur */

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  return NULL;

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}

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/* For the moment, we do not support initialising reference data types */

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/* ref_spec_init: 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 *spec_init_sperator_c::visit(ref_spec_init_c *symbol) {

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  TRACE("spec_init_sperator_c::ref_spec_init_c");

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  switch (search_what) {

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    case search_spec: return symbol->ref_spec;

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    case search_init: return symbol->ref_initialization;

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  }

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  ERROR; /* should never occur */

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  return NULL;

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}

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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 *spec_init_sperator_c::visit(single_byte_string_spec_c *symbol) {

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  TRACE("spec_init_sperator_c::single_byte_string_spec_c");

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  switch (search_what) {

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    case search_spec: return symbol->string_spec;

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    case search_init: return symbol->single_byte_character_string;

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  }

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  ERROR; /* should never occur */

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  return NULL;

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}

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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 *spec_init_sperator_c::visit(double_byte_string_spec_c *symbol) {

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  TRACE("spec_init_sperator_c::double_byte_string_spec_c");

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  switch (search_what) {

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    case search_spec: return symbol->string_spec;

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    case search_init: return symbol->double_byte_character_string;

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  }

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  ERROR; /* should never occur */

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  return NULL;

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}

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spec_init_sperator_c *spec_init_sperator_c ::class_instance = NULL;

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spec_init_sperator_c::search_what_t spec_init_sperator_c::search_what;