--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/absyntax_utils/search_varfb_instance_type.hh	Mon Jun 01 21:08:44 2009 +0200
@@ -0,0 +1,135 @@
+/*
+ * (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 variable.
+ * The variable may be a simple variable, a function block instance, a
+ * struture element within a data structured type (a struct or a fb), or
+ * an array element.
+ * A mixture of array element of a structure element of a structure element
+ * of a .... is also suported!
+ *
+ * A reference to the relevant base type __definition__ is returned.
+ * This means that if we find that the variable is of type MY_INT,
+ * which was previously declared to be
+ * TYPE MY_INT: INT := 9;
+ * this class wil return INT, and __not__ MY_INT !!
+ *
+ *
+ *  example:
+ *    window.points[1].coordinate.x
+ *    window.points[1].colour
+ *    etc... ARE ALLOWED!
+ *
+ * This class must be passed the scope within which the
+ * variable was declared, and the variable name...
+ */
+
+class search_varfb_instance_type_c: public search_base_type_c {
+
+  private:
+    search_var_instance_decl_c search_var_instance_decl;
+    decompose_var_instance_name_c *decompose_var_instance_name;
+    symbol_c *current_structelement_name;
+    bool search_base_type;
+
+  public:
+    search_varfb_instance_type_c(symbol_c *search_scope);
+    symbol_c *get_type(symbol_c *variable_name, bool base_type = true);
+
+    unsigned int get_vartype(symbol_c *variable_name);
+
+  private:
+    /* a helper function... */
+    void *visit_list(list_c *list);
+
+    /* a helper function... */
+    void *base_type(symbol_c *symbol);
+
+
+  private:
+    /* We override the base class' visitor to identifier_c.
+     * This is so because the base class does not consider a function block
+     * to be a type, unlike this class that allows a variable instance
+     * of a function block type...
+     */
+    void *visit(identifier_c *type_name);
+
+    /********************************/
+    /* B 1.3.3 - Derived data types */
+    /********************************/
+    
+    /*  identifier ':' array_spec_init */
+    void *visit(array_type_declaration_c *symbol);
+    
+    /* array_specification [ASSIGN array_initialization} */
+    /* array_initialization may be NULL ! */
+    void *visit(array_spec_init_c *symbol);
+    
+    /* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */
+    void *visit(array_specification_c *symbol);
+
+    /*  structure_type_name ':' structure_specification */
+    void *visit(structure_type_declaration_c *symbol);
+
+    /* structure_type_name ASSIGN structure_initialization */
+    /* structure_initialization may be NULL ! */
+    // SYM_REF2(initialized_structure_c, structure_type_name, structure_initialization)
+    void *visit(initialized_structure_c *symbol);
+
+    /* helper symbol for structure_declaration */
+    /* structure_declaration:  STRUCT structure_element_declaration_list END_STRUCT */
+    /* structure_element_declaration_list structure_element_declaration ';' */
+    void *visit(structure_element_declaration_list_c *symbol);
+
+    /*  structure_element_name ':' spec_init */
+    void *visit(structure_element_declaration_c *symbol);
+
+    /* helper symbol for structure_initialization */
+    /* structure_initialization: '(' structure_element_initialization_list ')' */
+    /* structure_element_initialization_list ',' structure_element_initialization */
+    void *visit(structure_element_initialization_list_c *symbol); /* should never get called... */
+    /*  structure_element_name ASSIGN value */
+    void *visit(structure_element_initialization_c *symbol); /* should never get called... */
+
+
+
+    /**************************************/
+    /* B.1.5 - Program organization units */
+    /**************************************/
+    /*****************************/
+    /* B 1.5.2 - Function Blocks */
+    /*****************************/
+    /*  FUNCTION_BLOCK derived_function_block_name io_OR_other_var_declarations function_block_body END_FUNCTION_BLOCK */
+    // SYM_REF4(function_block_declaration_c, fblock_name, var_declarations, fblock_body, unused)
+    void *visit(function_block_declaration_c *symbol);
+
+}; // search_varfb_instance_type_c
+
+
+
+
+
+