/* Copyright (c) 2010, Carl Burch. License information is located in the
* com.cburch.logisim.Main source code and at www.cburch.com/logisim/. */
package com.cburch.logisim.std.arith;
import com.cburch.logisim.data.Attribute;
import com.cburch.logisim.data.BitWidth;
import com.cburch.logisim.data.Bounds;
import com.cburch.logisim.data.Direction;
import com.cburch.logisim.data.Value;
import com.cburch.logisim.instance.InstanceFactory;
import com.cburch.logisim.instance.InstancePainter;
import com.cburch.logisim.instance.InstanceState;
import com.cburch.logisim.instance.Port;
import com.cburch.logisim.instance.StdAttr;
import com.cburch.logisim.tools.key.BitWidthConfigurator;
import static com.cburch.logisim.util.LocaleString.*;
public class Negator extends InstanceFactory {
private static final int IN = 0;
private static final int OUT = 1;
public Negator() {
super("Negator", getFromLocale("negatorComponent"));
setAttributes(new Attribute[] { StdAttr.WIDTH },
new Object[] { BitWidth.create(8) });
setKeyConfigurator(new BitWidthConfigurator(StdAttr.WIDTH));
setOffsetBounds(Bounds.create(-40, -20, 40, 40));
setIconName("negator.svg");
Port[] ps = new Port[2];
ps[IN] = new Port(-40, 0, Port.INPUT, StdAttr.WIDTH);
ps[OUT] = new Port( 0, 0, Port.OUTPUT, StdAttr.WIDTH);
ps[IN].setToolTip(getFromLocale("negatorInputTip"));
ps[OUT].setToolTip(getFromLocale("negatorOutputTip"));
setPorts(ps);
}
@Override
public void propagate(InstanceState state) {
// get attributes
BitWidth dataWidth = state.getAttributeValue(StdAttr.WIDTH);
// compute outputs
Value in = state.getPort(IN);
Value out;
if (in.isFullyDefined()) {
out = Value.createKnown(in.getBitWidth(), -in.toIntValue());
} else {
Value[] bits = in.getAll();
Value fill = Value.FALSE;
int pos = 0;
while (pos < bits.length) {
if (bits[pos] == Value.FALSE) {
bits[pos] = fill;
} else if (bits[pos] == Value.TRUE) {
if (fill != Value.FALSE) {
bits[pos] = fill;
}
pos++;
break;
} else if (bits[pos] == Value.ERROR) {
fill = Value.ERROR;
} else {
if (fill == Value.FALSE) {
fill = bits[pos];
}
else {
bits[pos] = fill;
}
}
pos++;
}
while (pos < bits.length) {
if (bits[pos] == Value.TRUE) {
bits[pos] = Value.FALSE;
} else if (bits[pos] == Value.FALSE) {
bits[pos] = Value.TRUE;
}
pos++;
}
out = Value.create(bits);
}
// propagate them
int delay = (dataWidth.getWidth() + 2) * Adder.PER_DELAY;
state.setPort(OUT, out, delay);
}
@Override
public void paintInstance(InstancePainter painter) {
painter.drawBounds();
painter.drawPort(IN);
painter.drawPort(OUT, "-x", Direction.WEST);
}
}