--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/stage3/case_elements_check.hh	Thu Apr 30 20:54:04 2015 +0100
@@ -0,0 +1,85 @@
+/*
+ *  matiec - a compiler for the programming languages defined in IEC 61131-3
+ *
+ *  Copyright (C) 2015  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)
+ *
+ */
+
+
+/*
+ * Case Options Checking:
+ *   - Check whether the options in a case statement are repeated, either directly, or in a range.
+ *       For example:
+ *         case var of
+ *           1: ...   <- OK
+ *           2: ...   <- OK
+ *           1: ...   <- OK (not an error), but produce a warning!
+ *           0..8: ...<- OK (not an error), but produce a warning!
+ */
+
+#include "../absyntax_utils/absyntax_utils.hh"
+
+
+
+class case_elements_check_c: public iterator_visitor_c {
+
+  private:
+    bool warning_found;
+    int error_count;
+    int current_display_error_level;
+
+    std::vector<symbol_c *> case_elements_list;
+    void check_subr_subr(symbol_c *s1, symbol_c *s2);
+    void check_subr_symb(symbol_c *s1, symbol_c *s2);
+    void check_symb_symb(symbol_c *s1, symbol_c *s2);
+  
+
+  public:
+    case_elements_check_c(symbol_c *ignore);
+    virtual ~case_elements_check_c(void);
+    int get_error_count();
+
+    /***************************************/
+    /* B.3 - Language ST (Structured Text) */
+    /***************************************/
+    /********************/
+    /* B 3.2 Statements */
+    /********************/
+    /********************************/
+    /* B 3.2.3 Selection Statements */
+    /********************************/
+    void *visit(case_statement_c *symbol);
+    void *visit(case_list_c      *symbol);
+}; /* case_elements_check_c */
+
+
+
+
+
+
+