--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/absyntax_utils/decompose_var_instance_name.hh	Mon Jun 01 21:08:44 2009 +0200
@@ -0,0 +1,89 @@
+/*
+ * (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)
+ *
+ */
+
+
+
+/* Decomposes a variable instance name into its constituents,
+ * example:
+ *    window.points[1].coordinate.x
+ *
+ *  will succesfully return
+ *        - window
+ *        - points
+ *        - coordinate
+ *        - x
+ * on succesive calls to decompose_var_instance_name_c::next_part()
+ */
+
+
+
+#include "../absyntax/visitor.hh"
+
+
+
+class decompose_var_instance_name_c: null_visitor_c {
+
+  private:
+    symbol_c *variable_name;
+    symbol_c *next_variable_name;
+    symbol_c *current_recursive_variable_name;
+    symbol_c *previously_returned_variable_name;
+
+  public:
+    decompose_var_instance_name_c(symbol_c *variable_instance_name);
+
+    symbol_c *next_part(void);
+
+  private:
+  /*********************/
+  /* B 1.4 - Variables */
+  /*********************/
+    void *visit(symbolic_variable_c *symbol);
+  
+  /********************************************/
+  /* B.1.4.1   Directly Represented Variables */
+  /********************************************/
+    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);
+  
+  /*  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);
+
+}; // decompose_var_instance_name_c
+
+
+
+