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varcomparison.cpp

/***************************************************************************
 *   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 "libraryitem.h"
#include "flowcode.h"

#include <klocale.h>

Item* VarComparison::construct( ItemDocument *itemDocument, bool newItem, const char *id )
{
      return new VarComparison( (ICNDocument*)itemDocument, newItem, id );
}

LibraryItem* VarComparison::libraryItem()
{
      return new LibraryItem(
            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");
      m_desc = i18n("Conditional branch point, depending on the comparison of two values. The supported comparisons are:<ul><li><b>x == y</b> - Equality: true if x has the same value as y.</li><li><b>x &lt; y</b> - Less than: true if x is smaller than y.</li><li><b>x &gt; y</b> - Greater than: true if x is bigger than y.</li><li><b>x &lt;= y</b> - Less than or equal: true if x is less than or equal to y.</li><li><b>x &gt;= y</b> - Greater than or equal: true if x is greater than or equal to y.</li><li><b>x != y</b> - Does not equal: true if x does not have the same value as y.</li></ul>");
      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::split( ',', "==,<,>,<=,>=,!=" ) );
      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") + " ?" );
}

00072 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
}

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