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Diffstat (limited to 'src/flowparts/varcomparison.cpp')
| -rw-r--r-- | src/flowparts/varcomparison.cpp | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/src/flowparts/varcomparison.cpp b/src/flowparts/varcomparison.cpp new file mode 100644 index 0000000..e01ebf2 --- /dev/null +++ b/src/flowparts/varcomparison.cpp @@ -0,0 +1,170 @@ +/*************************************************************************** + * 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 +} |