diff -r 49853bded539 -r 26cb3fa00d29 stage1_2/derived_conversion_functions.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/stage1_2/derived_conversion_functions.cc	Thu Nov 15 17:30:35 2012 +0100
@@ -0,0 +1,200 @@
+/*
+ *  matiec - a compiler for the programming languages defined in IEC 61131-3
+ *
+ *  Copyright (C) 2009-2012  Mario de Sousa (msousa@fe.up.pt)
+ *  Copyright (C) 2012       Manuele Conti  (conti.ma@alice.it)
+ *
+ *
+ *  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)
+ *
+ */
+
+
+#include "derived_conversion_functions.hh"
+#include <sstream>
+
+static const int debug = 0;
+
+derived_conversion_functions_c::derived_conversion_functions_c(symbol_c *ignore) {
+
+}
+
+derived_conversion_functions_c::~derived_conversion_functions_c(void) {
+
+}
+
+std::string &derived_conversion_functions_c::get_declaration(symbol_c *root) {
+    text = "";
+    if (NULL != root) {
+        root->accept(*this);
+    }
+
+    return text;
+}
+
+void *derived_conversion_functions_c::visit(identifier_c *symbol) {
+    currentToken = symbol->value;
+
+    return NULL;
+}
+
+void *derived_conversion_functions_c::visit(enumerated_type_declaration_c *symbol) {
+    std::string enumerateName;
+    std::string functionName;
+    std::list <std::string> enumerateValues;
+
+    symbol->enumerated_type_name->accept(*this);
+    enumerateName = currentToken;
+
+    symbol->enumerated_spec_init->accept(*this);
+    enumerateValues = currentTokenList;
+
+    printStringToEnum  (enumerateName, enumerateValues);
+    printEnumToString  (enumerateName, enumerateValues);
+    for (size_t s = 8; s <= 64; s*= 2) {
+        printIntegerToEnum (enumerateName, enumerateValues, true , s);
+        printEnumToInteger (enumerateName, enumerateValues, true , s);
+        printIntegerToEnum (enumerateName, enumerateValues, false, s);
+        printEnumToInteger (enumerateName, enumerateValues, false, s);
+    }
+    if (debug) std::cout << text << std::endl;
+    
+    return NULL;
+}
+
+void *derived_conversion_functions_c::visit(enumerated_value_list_c *symbol) {
+    list_c *list;
+
+    currentTokenList.clear();
+    list = (list_c *)symbol;
+    for (int i = 0; i < list->n; i++) {
+        list->elements[i]->accept(*this);
+        currentTokenList.push_back(currentToken);
+    }
+
+    return NULL;
+}
+
+std::string derived_conversion_functions_c::getIntegerName(bool isSigned, size_t size) {
+    std::string integerType = "";
+    if (! isSigned) {
+        integerType = "U";
+    }
+    switch(size) {
+    case 8 : integerType += "S"; break;
+    case 16:                     break;
+    case 32: integerType += "D"; break;
+    case 64: integerType += "L"; break;
+    default:                     break;
+    }
+    integerType +="INT";
+
+    return integerType;
+}
+
+void derived_conversion_functions_c::printStringToEnum  (std::string &enumerateName, std::list<std::string> &enumerateValues) {
+    std::list <std::string>::const_iterator itr;
+    std::string functionName;
+
+    functionName = "STRING_TO_" + enumerateName;
+    text += "FUNCTION " + functionName + " : " + enumerateName;
+    text += "\nVAR_INPUT\nIN : STRING;\nEND_VAR\n";
+    for (itr = enumerateValues.begin(); itr != enumerateValues.end(); ++itr) {
+       std::string value = *itr;
+       text += "IF IN = '" + value + "' THEN\n";
+       text += " " + functionName + " := " + value + ";\n";
+       text += " RETURN;\n";
+       text += "END_IF;\n";
+    }
+    text += "END_FUNCTION\n\n";
+}
+
+void derived_conversion_functions_c::printEnumToString  (std::string &enumerateName, std::list<std::string> &enumerateValues) {
+    std::list <std::string>::const_iterator itr;
+    std::string functionName;
+
+    functionName = enumerateName + "_TO_STRING";
+    text += "FUNCTION " + functionName + " : STRING";
+    text += "\nVAR_INPUT\nIN : " + enumerateName + ";\nEND_VAR\n";
+    for (itr = enumerateValues.begin(); itr != enumerateValues.end(); ++itr) {
+        std::string value = *itr;
+        text += "IF IN = " + value + " THEN\n";
+        text += " " + functionName + " := '" + value + "';\n";
+        text += " RETURN;\n";
+        text += "END_IF;\n";
+    }
+    text += "END_FUNCTION\n\n";
+}
+
+void derived_conversion_functions_c::printIntegerToEnum (std::string &enumerateName, std::list<std::string> &enumerateValues, bool isSigned, size_t size) {
+    std::list <std::string>::const_iterator itr;
+    std::string functionName;
+    std::string integerType;
+    int count;
+
+    integerType  = getIntegerName(isSigned, size);
+    functionName = integerType + "_TO_" + enumerateName;
+    text += "FUNCTION " + functionName + " : " + enumerateName;
+    text += "\nVAR_INPUT\nIN : " + integerType + ";\nEND_VAR\n";
+    count = 0;
+    for (itr = enumerateValues.begin(); itr != enumerateValues.end(); ++itr) {
+        std::string value = *itr;
+        std::stringstream out;
+        out << count;
+        text += "IF IN = " + out.str() + " THEN\n";
+        text += " " + functionName + " := " + value + ";\n";
+        text += " RETURN;\n";
+        text += "END_IF;\n";
+        count++;
+    }
+    text += "END_FUNCTION\n\n";
+}
+
+void derived_conversion_functions_c::printEnumToInteger (std::string &enumerateName, std::list<std::string> &enumerateValues, bool isSigned, size_t size) {
+    std::list <std::string>::const_iterator itr;
+    std::string functionName;
+    std::string integerType;
+    int count;
+
+    integerType  = getIntegerName(isSigned, size);
+    functionName = enumerateName + "_TO_" + integerType;
+    text += "FUNCTION " + functionName + " : " + integerType;
+    text += "\nVAR_INPUT\nIN : " + enumerateName + ";\nEND_VAR\n";
+    count = 0;
+    for (itr = enumerateValues.begin(); itr != enumerateValues.end(); ++itr) {
+        std::string value = *itr;
+        std::stringstream out;
+        out << count;
+        text += "IF IN = " + value + " THEN\n";
+        text += " " + functionName + " := " + out.str() + ";\n";
+        text += " RETURN;\n";
+        text += "END_IF;\n";
+        count++;
+    }
+    text += "END_FUNCTION\n\n";
+}
+
+
+