/*
* (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)
*
*/
/* Determine the data type of a specific constant or variable.
* A reference to the relevant type definition is returned.
*
* For example:
* 22 -> returns reference to a int_type_name_c object.
* 22.2 -> returns reference to a real_type_name_c object.
* LREAL#22.2 -> returns reference to a lreal_type_name_c object.
* etc...
*/
class search_constant_type_c: public search_visitor_c {
public:
/**********************/
/* B.1.3 - Data types */
/**********************/
/***********************************/
/* B 1.3.1 - Elementary Data Types */
/***********************************/
static real_type_name_c real_type_name;
static int_type_name_c int_type_name;
static string_type_name_c string_type_name;
static wstring_type_name_c wstring_type_name;
static time_type_name_c time_type_name;
static date_type_name_c date_type_name;
static dt_type_name_c dt_type_name;
static tod_type_name_c tod_type_name;
public:
symbol_c *get_type(symbol_c *constant) {
return (symbol_c *)constant->accept(*this);
}
public:
/*********************/
/* B 1.2 - Constants */
/*********************/
/******************************/
/* B 1.2.1 - Numeric Literals */
/******************************/
void *visit(real_c *symbol) {return (void *)&real_type_name;}
void *visit(integer_c *symbol) {return (void *)&int_type_name;}
void *visit(binary_integer_c *symbol) {return (void *)&int_type_name;}
void *visit(octal_integer_c *symbol) {return (void *)&int_type_name;}
void *visit(hex_integer_c *symbol) {return (void *)&int_type_name;}
void *visit(numeric_literal_c *symbol)
{return (void *)((symbol->type!=NULL)?symbol->type:symbol->value->accept(*this));}
void *visit(integer_literal_c *symbol)
{return (void *)((symbol->type!=NULL)?symbol->type:symbol->value->accept(*this));}
void *visit(real_literal_c *symbol)
{return (void *)((symbol->type!=NULL)?symbol->type:symbol->value->accept(*this));}
void *visit(bit_string_literal_c *symbol)
{return (void *)((symbol->type!=NULL)?symbol->type:symbol->value->accept(*this));}
void *visit(boolean_literal_c *symbol)
{return (void *)((symbol->type!=NULL)?symbol->type:symbol->value->accept(*this));}
/*******************************/
/* B.1.2.2 Character Strings */
/*******************************/
void *visit(double_byte_character_string_c *symbol) {return (void *)&wstring_type_name;}
void *visit(single_byte_character_string_c *symbol) {return (void *)&string_type_name;}
/***************************/
/* B 1.2.3 - Time Literals */
/***************************/
/************************/
/* B 1.2.3.1 - Duration */
/************************/
void *visit(neg_time_c *symbol) {ERROR; return NULL;} /* this member function should never be called. */
void *visit(duration_c *symbol) {return (void *)&time_type_name;}
void *visit(fixed_point_c *symbol) {ERROR; return NULL;} /* this member function should never be called. */
void *visit(days_c *symbol) {ERROR; return NULL;} /* this member function should never be called. */
void *visit(hours_c *symbol) {ERROR; return NULL;} /* this member function should never be called. */
void *visit(minutes_c *symbol) {ERROR; return NULL;} /* this member function should never be called. */
void *visit(seconds_c *symbol) {ERROR; return NULL;} /* this member function should never be called. */
void *visit(milliseconds_c *symbol) {ERROR; return NULL;} /* this member function should never be called. */
/************************************/
/* B 1.2.3.2 - Time of day and Date */
/************************************/
void *visit(time_of_day_c *symbol) {return (void *)&tod_type_name;}
void *visit(daytime_c *symbol) {ERROR; return NULL;} /* this member function should never be called. */
void *visit(date_c *symbol) {return (void *)&date_type_name;}
void *visit(date_literal_c *symbol) {ERROR; return NULL;} /* this member function should never be called. */
void *visit(date_and_time_c *symbol) {return (void *)&dt_type_name;}
};
real_type_name_c search_constant_type_c::real_type_name;
int_type_name_c search_constant_type_c::int_type_name;
string_type_name_c search_constant_type_c::string_type_name;
wstring_type_name_c search_constant_type_c::wstring_type_name;
time_type_name_c search_constant_type_c::time_type_name;
date_type_name_c search_constant_type_c::date_type_name;
dt_type_name_c search_constant_type_c::dt_type_name;
tod_type_name_c search_constant_type_c::tod_type_name;