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/***************************************************************************
* 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 < y</b> - Less than: true if x is smaller than y.</li><li><b>x > y</b> - Greater than: true if x is bigger than y.</li><li><b>x <= y</b> - Less than or equal: true if x is less than or equal to y.</li><li><b>x >= 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") + " ?" );
}
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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