--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/absyntax_utils/get_var_name.hh	Mon Apr 16 15:10:31 2012 +0100
@@ -0,0 +1,115 @@
+/*
+ *  matiec - a compiler for the programming languages defined in IEC 61131-3
+ *
+ *  Copyright (C) 2012  Mario de Sousa (msousa@fe.up.pt)
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 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.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ * 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 compiler.
+ *
+ * Based on the
+ * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
+ *
+ */
+
+/*
+ *  A small helper visitor class, that will   
+ *  return the name (tokn_c *) of a variable, as it will
+ *  appear in the variable declaration.
+ */
+
+/*  For ex.:
+ *       VAR
+ *          A : int;
+ *          B : ARRAY [1..9] of int;
+ *          C : some_struct_t;
+ *       END_VAR
+ *
+ *          A    := 56;
+ *          B[8] := 99;
+ *          C.e  := 77;
+ *
+ *       Calling this visitor class with symbolic_variable_c instance referencing 'A' in
+ *       the line 'A := 56', will return the string "A".
+ *
+ *       Calling this visitor class with array_variable_c instance referencing 'B[8]' in
+ *       the line 'B[8] := 99', will return the string "B".
+ *
+ *       Calling this visitor class with array_variable_c instance referencing 'C.e' in
+ *       the line 'C.e := 77', will return the string "C".
+ */
+
+
+
+
+class get_var_name_c : public search_visitor_c {    
+  public:
+    get_var_name_c(void)  {};
+    ~get_var_name_c(void) {};  
+    static token_c *get_name(symbol_c *symbol);
+
+  private:
+    static get_var_name_c *singleton_instance_;
+    
+  private:  
+    /*************************/
+    /* B.1 - Common elements */
+    /*************************/
+    /*******************************************/
+    /* B 1.1 - Letters, digits and identifiers */
+    /*******************************************/
+    // SYM_TOKEN(identifier_c)
+    void *visit(identifier_c *symbol);
+
+    /*********************/
+    /* B 1.4 - Variables */
+    /*********************/
+    // SYM_REF2(symbolic_variable_c, var_name, unused)
+    void *visit(symbolic_variable_c *symbol);
+
+    /********************************************/
+    /* B.1.4.1   Directly Represented Variables */
+    /********************************************/
+    // SYM_TOKEN(direct_variable_c)
+    // void *visit(direct_variable_c *symbol);
+
+    /*************************************/
+    /* B.1.4.2   Multi-element Variables */
+    /*************************************/
+    /*  subscripted_variable '[' subscript_list ']' */
+    // SYM_REF2(array_variable_c, subscripted_variable, subscript_list)
+    void *visit(array_variable_c *symbol);
+
+    /* subscript_list ',' subscript */
+    // SYM_LIST(subscript_list_c)
+    // void *visit(subscript_list_c *symbol);
+
+    /*  record_variable '.' field_selector */
+    /*  WARNING: input and/or output variables of function blocks
+     *           may be accessed as fields of a tructured variable!
+     *           Code handling a structured_variable_c must take
+     *           this into account!
+     */
+    // SYM_REF2(structured_variable_c, record_variable, field_selector)
+    void *visit(structured_variable_c *symbol);
+};
+
+
+