--- /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
+
+
+
+
+
+
+