--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/stage4/generate_cc/search_constant_type.cc	Wed Jan 31 15:32:38 2007 +0100
@@ -0,0 +1,130 @@
+/*
+ * (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;
+
+
+
+
+
+
+