--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/absyntax_utils/case_element_iterator.hh	Fri Sep 02 18:15:55 2011 +0200
@@ -0,0 +1,127 @@
+/*
+ *  matiec - a compiler for the programming languages defined in IEC 61131-3
+ *
+ *  Copyright (C) 2003-2011  Mario de Sousa (msousa@fe.up.pt)
+ *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant
+ *
+ *  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)
+ *
+ */
+
+
+/*
+ * Case element iterator.
+ * Iterate through the elements of a case list.
+ *
+ * This is part of the 4th stage that generates
+ * a c++ source program equivalent to the IL and ST
+ * code.
+ */
+
+/* Given a case_list_c and a type of element, iterate through
+ * each element, returning the symbol of each element if from
+ * the good type...case_element_iterator_c
+ */
+
+
+#include "../absyntax/visitor.hh"
+
+
+class case_element_iterator_c : public null_visitor_c {
+  public:
+    /* A type to specify the type of element.
+     */
+    typedef enum {
+      element_single,
+      element_subrange,
+    } case_element_t ;
+
+
+  private:
+    /* a pointer to the function_block_declaration_c
+     * or function_declaration_c currently being analysed.
+     */
+    symbol_c *case_list;
+    /* used when called to iterate() for a parameter */
+    symbol_c *current_case_element;
+
+    /* used to indicate the type of case element on which iterate */
+    case_element_t wanted_element_type;
+
+  private:
+    void* handle_case_element(symbol_c *case_element);
+
+    void* iterate_list(list_c *list);
+
+  public:
+    /* start off at the first case element once again... */
+    void reset(void);
+
+    /* initialise the iterator object.
+     * We must be given a reference to a case_list_c that will be analysed...
+     */
+    case_element_iterator_c(symbol_c *list, case_element_t element_type);
+
+    /* Skip to the next case element of type chosen. After object creation,
+     * the object references on case element _before_ the first, so
+     * this function must be called once to get the object to
+     * reference the first element...
+     *
+     * Returns the case element's symbol!
+     */
+    symbol_c *next(void);
+
+    private:
+    
+    /******************************/
+    /* B 1.2.1 - Numeric Literals */
+    /******************************/
+    void *visit(integer_c *symbol);
+    void *visit(neg_integer_c *symbol);
+
+    /********************************/
+    /* B 1.3.3 - Derived data types */
+    /********************************/
+    /*  signed_integer DOTDOT signed_integer */
+    void *visit(subrange_c *symbol);
+
+    /* enumerated_type_name '#' identifier */
+    void *visit(enumerated_value_c *symbol);
+
+    /********************************/
+    /* B 3.2.3 Selection Statements */
+    /********************************/
+    void *visit(case_list_c *symbol);
+
+    
+
+}; // function_param_iterator_c
+
+
+
+
+
+
+