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/*

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 *  matiec - a compiler for the programming languages defined in IEC 61131-3

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 *

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 *  Copyright (C) 2009-2012  Mario de Sousa (msousa@fe.up.pt)

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 *  Copyright (C) 2012       Manuele Conti  (conti.ma@alice.it)

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 *

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 *

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 *  This program is free software: you can redistribute it and/or modify

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 *  it under the terms of the GNU General Public License as published by

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 *  the Free Software Foundation, either version 3 of the License, or

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 *  (at your option) any later version.

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 *

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 *  This program is distributed in the hope that it will be useful,

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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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 *  GNU General Public License for more details.

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 *

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 *  You should have received a copy of the GNU General Public License

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 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.

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 *

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 *

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 * This code is made available on the understanding that it will not be

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 * used in safety-critical situations without a full and competent review.

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 */

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/*

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 * An IEC 61131-3 compiler.

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 *

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 * Based on the

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 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)

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 *

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 */

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#include <sstream>

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#include "create_enumtype_conversion_functions.hh"

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/* set to 1 to see debug info during execution */

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static const int debug = 0;

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/* 

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 * The create_enumtype_conversion_functions_c class generates ST source code!

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 * This code is in actual fact datatype conversion functions between user defined

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 * enumerated datatypes, and some basic datatypes.

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 *

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 * These conversion functions cannot be implemented the normal way (i.e. in the standard library)

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 * since they convert from/to a datatype that is defined by the user. So, we generate these conversions

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 * functions on the fly! 

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 * (to get an idea of what the generated code looks like, see the comments in create_enumtype_conversion_functions.cc)

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 *

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 * Currently, we support conversion between the user defined enumerated datatype and STRING,

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 * SINT, INT, DINT, LINT, USINT, UINT, UDINT, ULINT (basically the ANY_INT)

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 *

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 * ST source code is generated when the method get_declaration() is called. since the

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 * create_enumtype_conversion_functions_c inherits from the iterator visitor, this method may be 

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 * passed either the root of an abstract syntax tree, or sub-tree of the AST.

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 *

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 * This class will iterate through that AST, and for each enumerated type declaration, will 

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 * create the apropriate conversion functions.

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 */

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create_enumtype_conversion_functions_c *create_enumtype_conversion_functions_c::singleton = NULL;

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create_enumtype_conversion_functions_c:: create_enumtype_conversion_functions_c(symbol_c *ignore) {}

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create_enumtype_conversion_functions_c::~create_enumtype_conversion_functions_c(void)             {}

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std::string &create_enumtype_conversion_functions_c::get_declaration(symbol_c *symbol) {

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    if (NULL == singleton)  singleton = new create_enumtype_conversion_functions_c(NULL);

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    if (NULL == singleton)  ERROR_MSG("Out of memory. Bailing out!\n");

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    singleton->text = "";

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    if (NULL != symbol) 

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      symbol->accept(*singleton);

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    return singleton->text;

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}

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void *create_enumtype_conversion_functions_c::visit(identifier_c *symbol) {

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    currentToken = symbol->value;

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    return NULL;

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}

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/**********************/

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/* B 1.3 - Data types */

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/**********************/

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/********************************/

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/* B 1.3.3 - Derived data types */

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/********************************/

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void *create_enumtype_conversion_functions_c::visit(enumerated_type_declaration_c *symbol) {

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    std::string enumerateName;

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    std::string functionName;

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    std::list <std::string> enumerateValues;

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    symbol->enumerated_type_name->accept(*this);

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    enumerateName = currentToken;

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    symbol->enumerated_spec_init->accept(*this);

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    enumerateValues = currentTokenList;

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    printStringToEnum  (enumerateName, enumerateValues);

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    printEnumToString  (enumerateName, enumerateValues);

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    for (size_t s = 8; s <= 64; s*= 2) {

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        printIntegerToEnum (enumerateName, enumerateValues, true , s);

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        printEnumToInteger (enumerateName, enumerateValues, true , s);

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        printIntegerToEnum (enumerateName, enumerateValues, false, s);

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        printEnumToInteger (enumerateName, enumerateValues, false, s);

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    }

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    if (debug) std::cout << text << std::endl;

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    return NULL;

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}

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void *create_enumtype_conversion_functions_c::visit(enumerated_value_list_c *symbol) {

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    list_c *list;

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    currentTokenList.clear();

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    list = (list_c *)symbol;

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    for (int i = 0; i < list->n; i++) {

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        list->elements[i]->accept(*this);

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        currentTokenList.push_back(currentToken);

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    }

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    return NULL;

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}

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/*

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 * getIntegerName function generate a integer data name from signed and size.

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 */

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std::string create_enumtype_conversion_functions_c::getIntegerName(bool isSigned, size_t size) {

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    std::string integerType = "";

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    if (! isSigned) {

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        integerType = "U";

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    }

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    switch(size) {

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    case 8 : integerType += "S"; break;

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    case 16:                     break;

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    case 32: integerType += "D"; break;

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    case 64: integerType += "L"; break;

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    default:                     break;

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    }

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    integerType +="INT";

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    return integerType;

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}

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/*

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 * printStringToEnum function print conversion function from STRING to <ENUM>:

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 * ST Output:

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 *

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 FUNCTION STRING_TO_<ENUM> : <ENUM>

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  VAR_INPUT

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  IN: STRING;

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  END_VAR

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  IF IN = '<ENUM.VALUE_1>' THEN

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   STRING_TO_<ENUM> := <ENUM.VALUE_1>;

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   RETURN;

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  END_IF;

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  ...

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  IF IN = '<ENUM.VALU_N>' THEN

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   STRING_TO_<ENUM> := <ENUM.VALUE_N>;

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   RETURN;

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  END_IF;

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  ENO := FALSE;

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  END_FUNCTION

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  Note: if you change code below remember to update this comment.

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 */

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void create_enumtype_conversion_functions_c::printStringToEnum  (std::string &enumerateName, std::list<std::string> &enumerateValues) {

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    std::list <std::string>::const_iterator itr;

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    std::string functionName;

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    functionName = "STRING_TO_" + enumerateName;

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    text += "FUNCTION " + functionName + " : " + enumerateName;

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    text += "\nVAR_INPUT\nIN : STRING;\nEND_VAR\n";

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    for (itr = enumerateValues.begin(); itr != enumerateValues.end(); ++itr) {

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       std::string value = *itr;

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       text += "IF IN = '" + value + "' THEN\n";

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       text += " " + functionName + " := " + value + ";\n";

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       text += " RETURN;\n"; 

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       text += "END_IF;\n";

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    }

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    text += "ENO := FALSE;\n";

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    text += "END_FUNCTION\n\n";

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}

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/*

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 * printEnumToString function print conversion function from <ENUM> to STRING:

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 * ST Output:

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 *

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 FUNCTION <ENUM>_TO_STRING : STRING

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  VAR_INPUT

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  IN: <ENUM>;

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  END_VAR

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  IF IN = <ENUM.VALUE_1> THEN

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   RETURN;

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  END_IF;

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  ...

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  IF IN = <ENUM.VALUE_N> THEN

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   RETURN;

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  END_IF;

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  ENO := FALSE;

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  END_FUNCTION

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  Note: if you change code below remember to update this comment.

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 */

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void create_enumtype_conversion_functions_c::printEnumToString  (std::string &enumerateName, std::list<std::string> &enumerateValues) {

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    std::list <std::string>::const_iterator itr;

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    std::string functionName;

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    functionName = enumerateName + "_TO_STRING";

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    text += "FUNCTION " + functionName + " : STRING";

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    text += "\nVAR_INPUT\nIN : " + enumerateName + ";\nEND_VAR\n";

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    for (itr = enumerateValues.begin(); itr != enumerateValues.end(); ++itr) {

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        std::string value = *itr;

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        text += "IF IN = " + value + " THEN\n";

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        text += " RETURN;\n";

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        text += "END_IF;\n";

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    }

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    text += "ENO := FALSE;\n";

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    text += "END_FUNCTION\n\n";

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}

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/*

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 * printIntegerToEnum function print conversion function from <INTEGER> to <ENUM>:

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 * ST Output:

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 *

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 FUNCTION <INTEGER>_TO_<ENUM> : <ENUM>

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  VAR_INPUT

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  IN: <INTEGER>;

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  END_VAR

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  IF IN = 1 THEN

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   <INTEGER>_TO_<ENUM> := <ENUM.VALUE_1>;

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   RETURN;

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  END_IF;

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  ...

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  IF IN = N THEN

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   <INTEGER>_TO_<ENUM> := <ENUM.VALUE_N>;

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   RETURN;

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  END_IF;

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  ENO := FALSE;

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  END_FUNCTION

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  Note: if you change code below remember to update this comment.

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 */

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void create_enumtype_conversion_functions_c::printIntegerToEnum (std::string &enumerateName, std::list<std::string> &enumerateValues, bool isSigned, size_t size) {

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    std::list <std::string>::const_iterator itr;

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    std::string functionName;

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    std::string integerType;

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    int count;

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    integerType  = getIntegerName(isSigned, size);

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    functionName = integerType + "_TO_" + enumerateName;

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    text += "FUNCTION " + functionName + " : " + enumerateName;

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    text += "\nVAR_INPUT\nIN : " + integerType + ";\nEND_VAR\n";

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    count = 0;

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    for (itr = enumerateValues.begin(); itr != enumerateValues.end(); ++itr) {

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        std::string value = *itr;

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        std::stringstream out;

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        out << count;

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        text += "IF IN = " + out.str() + " THEN\n";

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        text += " " + functionName + " := " + value + ";\n";

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        text += " RETURN;\n";

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        text += "END_IF;\n";

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        count++;

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    }

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    text += "ENO := FALSE;\n";

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    text += "END_FUNCTION\n\n";

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}

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/*

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 * printEnumToInteger function print conversion function from <ENUM> to <INTEGER>:

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 * ST Output:

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 *

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 FUNCTION <ENUM>_TO_<INTEGER> : <INTEGER>

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  VAR_INPUT

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  IN: <INTEGER>;

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  END_VAR

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  IF IN = <ENUM.VALUE_1> THEN

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   <ENUM>_TO_<INTEGER> := 1;

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   RETURN;

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  END_IF;

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  ...

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  IF IN = <ENUM.VALUE_N> THEN

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   <ENUM>_TO_<INTEGER> := N;

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   RETURN;

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  END_IF;

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  ENO := FALSE;

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  END_FUNCTION

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  Note: if you change code below remember to update this comment.

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 */

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void create_enumtype_conversion_functions_c::printEnumToInteger (std::string &enumerateName, std::list<std::string> &enumerateValues, bool isSigned, size_t size) {

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    std::list <std::string>::const_iterator itr;

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    std::string functionName;

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    std::string integerType;

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    int count;

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    integerType  = getIntegerName(isSigned, size);

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    functionName = enumerateName + "_TO_" + integerType;

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    text += "FUNCTION " + functionName + " : " + integerType;

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    text += "\nVAR_INPUT\nIN : " + enumerateName + ";\nEND_VAR\n";

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    count = 0;

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    for (itr = enumerateValues.begin(); itr != enumerateValues.end(); ++itr) {

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        std::string value = *itr;

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        std::stringstream out;

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        out << count;

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        text += "IF IN = " + value + " THEN\n";

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        text += " " + functionName + " := " + out.str() + ";\n";

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        text += " RETURN;\n";

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        text += "END_IF;\n";

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        count++;

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    }

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    text += "ENO := FALSE;\n";

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    text += "END_FUNCTION\n\n";

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}

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