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/*

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 * (c) 2003 Mario de Sousa

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 *

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 * Offered to the public under the terms of the GNU General Public License

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 * as published by the Free Software Foundation; either version 2 of the

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 * License, or (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, but

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 * WITHOUT ANY WARRANTY; without even the implied warranty of

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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General

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 * Public License for more details.

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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 IL and ST 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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/* Determine the data type of a specific constant or variable.

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 * A reference to the relevant type definition is returned.

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 *

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 * For example:

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 *       22          -> returns reference to a int_type_name_c object.

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 *       22.2        -> returns reference to a real_type_name_c object.

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 *       LREAL#22.2  -> returns reference to a lreal_type_name_c object.

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 *       etc...

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 */

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class search_constant_type_c: public search_visitor_c {

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  public:

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

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/* B.1.3 - Data types */

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

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

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/* B 1.3.1 - Elementary Data Types */

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

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  static real_type_name_c     real_type_name;

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  static int_type_name_c      int_type_name;

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  static string_type_name_c   string_type_name;

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  static wstring_type_name_c  wstring_type_name;

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  static time_type_name_c     time_type_name;

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  static date_type_name_c     date_type_name;

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  static dt_type_name_c       dt_type_name;

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  static tod_type_name_c      tod_type_name;

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  public:

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    symbol_c *get_type(symbol_c *constant) {

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      return (symbol_c *)constant->accept(*this);

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    }

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  public:

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

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/* B 1.2 - Constants */

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

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

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/* B 1.2.1 - Numeric Literals */

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

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    void *visit(real_c *symbol) {return (void *)&real_type_name;}

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    void *visit(integer_c *symbol) {return (void *)&int_type_name;}

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    void *visit(binary_integer_c *symbol) {return (void *)&int_type_name;}

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    void *visit(octal_integer_c *symbol) {return (void *)&int_type_name;}

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    void *visit(hex_integer_c *symbol) {return (void *)&int_type_name;}

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    void *visit(numeric_literal_c *symbol)

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      {return (void *)((symbol->type!=NULL)?symbol->type:symbol->value->accept(*this));}

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    void *visit(integer_literal_c *symbol)

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      {return (void *)((symbol->type!=NULL)?symbol->type:symbol->value->accept(*this));}

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    void *visit(real_literal_c *symbol)

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      {return (void *)((symbol->type!=NULL)?symbol->type:symbol->value->accept(*this));}

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    void *visit(bit_string_literal_c *symbol)

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      {return (void *)((symbol->type!=NULL)?symbol->type:symbol->value->accept(*this));}

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    void *visit(boolean_literal_c *symbol)

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      {return (void *)((symbol->type!=NULL)?symbol->type:symbol->value->accept(*this));}

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

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/* B.1.2.2   Character Strings */

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

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    void *visit(double_byte_character_string_c *symbol) {return (void *)&wstring_type_name;}

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    void *visit(single_byte_character_string_c *symbol) {return (void *)&string_type_name;}

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

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/* B 1.2.3 - Time Literals */

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

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

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/* B 1.2.3.1 - Duration */

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

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    void *visit(neg_time_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

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    void *visit(duration_c *symbol) {return (void *)&time_type_name;}

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    void *visit(fixed_point_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

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    void *visit(days_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

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    void *visit(hours_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

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    void *visit(minutes_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

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    void *visit(seconds_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

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    void *visit(milliseconds_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

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

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/* B 1.2.3.2 - Time of day and Date */

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

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    void *visit(time_of_day_c *symbol) {return (void *)&tod_type_name;}

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    void *visit(daytime_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

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    void *visit(date_c *symbol) {return (void *)&date_type_name;}

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    void *visit(date_literal_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

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    void *visit(date_and_time_c *symbol) {return (void *)&dt_type_name;}

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};

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real_type_name_c     search_constant_type_c::real_type_name;

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int_type_name_c      search_constant_type_c::int_type_name;

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string_type_name_c   search_constant_type_c::string_type_name;

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wstring_type_name_c  search_constant_type_c::wstring_type_name;

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time_type_name_c     search_constant_type_c::time_type_name;

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date_type_name_c     search_constant_type_c::date_type_name;

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dt_type_name_c       search_constant_type_c::dt_type_name;

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tod_type_name_c      search_constant_type_c::tod_type_name;

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