File indexing completed on 2024-04-28 13:39:12

 /***************************************************************************
  *   Copyright (C) 2003 by David Saxton                                    *
  *   david@bluehaze.org                                                    *
  *                                                                         *
  *   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 2 of the License, or     *
  *   (at your option) any later version.                                   *
  ***************************************************************************/
 
 #include "varcomparison.h"
 
 #include "flowcode.h"
 #include "libraryitem.h"
 #include "icndocument.h"
 
 #include <KLocalizedString>
 
 Item *VarComparison::construct(ItemDocument *itemDocument, bool newItem, const char *id)
 {
     return new VarComparison(static_cast<ICNDocument *>(itemDocument), newItem, id);
 }
 
 LibraryItem *VarComparison::libraryItem()
 {
     return new LibraryItem(QStringList(QString("flow/varcomparison")), i18n("Comparison"), i18n("Variables"), "branch.png", LibraryItem::lit_flowpart, VarComparison::construct);
 }
 
 VarComparison::VarComparison(ICNDocument *icnDocument, bool newItem, const char *id)
     : FlowPart(icnDocument, newItem, id ? id : "varcomparison")
 {
     m_name = i18n("Variable Comparison");
     initDecisionSymbol();
     createStdInput();
     createStdOutput();
     createAltOutput();
 
     createProperty("0var1", Variant::Type::Combo);
     property("0var1")->setCaption(i18n("Variable"));
     property("0var1")->setValue("x");
 
     createProperty("1op", Variant::Type::Select);
     property("1op")->setAllowed((QStringList("==") << "<"
                                                    << ">"
                                                    << "<="
                                                    << ">="
                                                    << "!="));
     property("1op")->setValue("==");
     property("1op")->setToolbarCaption(" ");
     property("1op")->setEditorCaption(i18n("Operation"));
 
     createProperty("2var2", Variant::Type::Combo);
     property("2var2")->setToolbarCaption(" ");
     property("2var2")->setEditorCaption(i18n("Value"));
     property("2var2")->setValue("0");
 
     addDisplayText("output_false", QRect(offsetX() + width(), 2, 40, 20), "No");
     addDisplayText("output_true", QRect(0, offsetY() + height(), 50, 20), "Yes");
 }
 
 VarComparison::~VarComparison()
 {
 }
 
 void VarComparison::dataChanged()
 {
     setCaption(dataString("0var1") + " " + dataString("1op") + " " + dataString("2var2") + " ?");
 }
 
 QString VarComparison::oppOp(const QString &op)
 {
     if (op == "==")
         return "!=";
     if (op == "!=")
         return "==";
     else if (op == "<")
         return ">=";
     else if (op == ">=")
         return "<";
     else if (op == ">")
         return "<=";
     else if (op == "<=")
         return ">";
     else
         return "__UNKNOWN_OP__";
 }
 
 void VarComparison::generateMicrobe(FlowCode *code)
 {
     QString var1 = dataString("0var1");
     QString var2 = dataString("2var2");
     QString test = dataString("1op");
 
     handleIfElse(code, var1 + " " + test + " " + var2, var1 + " " + oppOp(test) + " " + var2, "stdoutput", "altoutput");
 
 #if 0
     code->addCode( "if "+var1+" "+test+" "+var2+"\n{\n" );
     code->addCodeBranch( outputPart("stdoutput") );
     code->addCode("}");
     if ( outputPart("altoutput") )
     {
         code->addCode("else\n{");
         code->addCodeBranch( outputPart("altoutput") );
         code->addCode("}");
     }
 #endif
 
 #if 0
     QString newCode;
     
     if ( FlowCode::isLiteral(var2) ) newCode += "movlw " + var2 + " ; Move literal to register w\n";
     else
     {
         code->addVariable(var2);
         newCode += "movf " + var2 + ",0 ; Move " + var2 + " to register w\n";
     }
     
     if ( FlowCode::isLiteral(var1) ) newCode += "sublw " + var1 + " ; Subtract register w from " + var1 + ", placing result in w\n";
     else
     {
         code->addVariable(var1);
         newCode += "subwf " + var1 + ",0 ; Subtract register w from " + var1 + ", placing result in w\n";
     }
     
     
     if      ( test == "==" )
     {
         // check: works
         newCode += "btfss STATUS,2 ; Check if zero flag is set\n";
         newCode += gotoCode("altoutput") + " ; Result from calculation was non-zero; hence comparison is false\n";
         newCode += gotoCode("stdoutput") + " ; Ouput was zero; hence comparison is true, so continue from this point\n";
     }
     else if ( test == "!=" )
     {
         // check: works
         newCode += "btfsc STATUS,2 ; Check if zero flag is clear\n";
         newCode += gotoCode("altoutput") + " ; Result from calculation was zero; hence comparison is false\n";
         newCode += gotoCode("stdoutput") + " ; Output was non-zero; hence comparison is true, so continue from this point\n";
     }
     else if ( test == ">=" )
     {
         // check: works
         newCode += "btfss STATUS,0 ; Check if carry flag is set\n";
         newCode += gotoCode("altoutput") + " ; Result from calculation is negative; hence comparison is false\n";
         newCode += gotoCode("stdoutput") + " ; Result from calculation is positive or zero; so continue from this point\n";
     }
     else if ( test == ">" )
     {
         // check: works
         newCode += "btfss STATUS,0 ; Check if carry flag is set\n";
         newCode += gotoCode("altoutput") + " ; Result is negative; hence comparison is false\n";
         newCode += "btfsc STATUS,2 ; Check if zero flag is set\n";
         newCode += gotoCode("altoutput") + " ; Result is zero; hence comparison is false\n";
         newCode += gotoCode("stdoutput") + " ; Comparison is true, so continue from this point\n";
     }
     else if ( test == "<" )
     {
         // check: works
         newCode += "btfsc STATUS,0 ; Check if carry flag is set\n";
         newCode += gotoCode("altoutput");
         newCode += gotoCode("stdoutput");
     }
     else if ( test == "<=" )
     {
         // check: works
         newCode += "btfsc STATUS,2 ; Check if result is zero\n";
         newCode += gotoCode("stdoutput") + " ; Result is zero; hence comparison is true\n";
         newCode += "btfsc STATUS,0 ; Check if carry flag is set\n";
         newCode += gotoCode("altoutput") + " ; Result is positive (not zero, has already tested for this); hence comparison is false\n";
         newCode += gotoCode("stdoutput") + " ; Result is negative, hence comparison is true\n";
     }
     
     code->addCodeBlock( id(), newCode );
 #endif
 }