/* 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 java.awt.Graphics;
import com.cburch.logisim.data.Attribute;
import com.cburch.logisim.data.AttributeOption;
import com.cburch.logisim.data.AttributeSet;
import com.cburch.logisim.data.Attributes;
import com.cburch.logisim.data.BitWidth;
import com.cburch.logisim.data.Bounds;
import com.cburch.logisim.data.Value;
import com.cburch.logisim.instance.Instance;
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 com.cburch.logisim.util.GraphicsUtil;
public class BitFinder extends InstanceFactory {
static final AttributeOption LOW_ONE
= new AttributeOption("low1", Strings.getter("bitFinderLowOption", "1"));
static final AttributeOption HIGH_ONE
= new AttributeOption("high1", Strings.getter("bitFinderHighOption", "1"));
static final AttributeOption LOW_ZERO
= new AttributeOption("low0", Strings.getter("bitFinderLowOption", "0"));
static final AttributeOption HIGH_ZERO
= new AttributeOption("high0", Strings.getter("bitFinderHighOption", "0"));
static final Attribute<AttributeOption> TYPE
= Attributes.forOption("type", Strings.getter("bitFinderTypeAttr"),
new AttributeOption[] { LOW_ONE, HIGH_ONE, LOW_ZERO, HIGH_ZERO });
public BitFinder() {
super("BitFinder", Strings.getter("bitFinderComponent"));
setAttributes(new Attribute[] {
StdAttr.WIDTH, TYPE
}, new Object[] {
BitWidth.create(8), LOW_ONE
});
setKeyConfigurator(new BitWidthConfigurator(StdAttr.WIDTH));
setIconName("bitfindr.gif");
}
@Override
public Bounds getOffsetBounds(AttributeSet attrs) {
return Bounds.create(-40, -20, 40, 40);
}
@Override
protected void configureNewInstance(Instance instance) {
configurePorts(instance);
instance.addAttributeListener();
}
@Override
protected void instanceAttributeChanged(Instance instance, Attribute<?> attr) {
if (attr == StdAttr.WIDTH) {
configurePorts(instance);
} else if (attr == TYPE) {
instance.fireInvalidated();
}
}
private void configurePorts(Instance instance) {
BitWidth inWidth = instance.getAttributeValue(StdAttr.WIDTH);
int outWidth = computeOutputBits(inWidth.getWidth() - 1);
Port[] ps = new Port[3];
ps[0] = new Port(-20, 20, Port.OUTPUT, BitWidth.ONE);
ps[1] = new Port( 0, 0, Port.OUTPUT, BitWidth.create(outWidth));
ps[2] = new Port(-40, 0, Port.INPUT, inWidth);
Object type = instance.getAttributeValue(TYPE);
if (type == HIGH_ZERO) {
ps[0].setToolTip(Strings.getter("bitFinderPresentTip", "0"));
ps[1].setToolTip(Strings.getter("bitFinderIndexHighTip", "0"));
} else if (type == LOW_ZERO) {
ps[0].setToolTip(Strings.getter("bitFinderPresentTip", "0"));
ps[1].setToolTip(Strings.getter("bitFinderIndexLowTip", "0"));
} else if (type == HIGH_ONE) {
ps[0].setToolTip(Strings.getter("bitFinderPresentTip", "1"));
ps[1].setToolTip(Strings.getter("bitFinderIndexHighTip", "1"));
} else {
ps[0].setToolTip(Strings.getter("bitFinderPresentTip", "1"));
ps[1].setToolTip(Strings.getter("bitFinderIndexLowTip", "1"));
}
ps[2].setToolTip(Strings.getter("bitFinderInputTip"));
instance.setPorts(ps);
}
private int computeOutputBits(int maxBits) {
int outWidth = 1;
while ((1 << outWidth) <= maxBits) outWidth++;
return outWidth;
}
@Override
public void propagate(InstanceState state) {
int width = state.getAttributeValue(StdAttr.WIDTH).getWidth();
int outWidth = computeOutputBits(width - 1);
Object type = state.getAttributeValue(TYPE);
Value[] bits = state.getPort(2).getAll();
Value want;
int i;
if (type == HIGH_ZERO) {
want = Value.FALSE;
for (i = bits.length - 1; i >= 0 && bits[i] == Value.TRUE; i--) { }
} else if (type == LOW_ZERO) {
want = Value.FALSE;
for (i = 0; i < bits.length && bits[i] == Value.TRUE; i++) { }
} else if (type == HIGH_ONE) {
want = Value.TRUE;
for (i = bits.length - 1; i >= 0 && bits[i] == Value.FALSE; i--) { }
} else {
want = Value.TRUE;
for (i = 0; i < bits.length && bits[i] == Value.FALSE; i++) { }
}
Value present;
Value index;
if (i < 0 || i >= bits.length) {
present = Value.FALSE;
index = Value.createKnown(BitWidth.create(outWidth), 0);
} else if (bits[i] == want) {
present = Value.TRUE;
index = Value.createKnown(BitWidth.create(outWidth), i);
} else {
present = Value.ERROR;
index = Value.createError(BitWidth.create(outWidth));
}
int delay = outWidth * Adder.PER_DELAY;
state.setPort(0, present, delay);
state.setPort(1, index, delay);
}
@Override
public void paintInstance(InstancePainter painter) {
Graphics g = painter.getGraphics();
painter.drawBounds();
painter.drawPorts();
String top = Strings.get("bitFinderFindLabel");
String mid;
String bot;
Object type = painter.getAttributeValue(TYPE);
if (type == HIGH_ZERO) {
mid = Strings.get("bitFinderHighLabel");
bot = "0";
} else if (type == LOW_ZERO) {
mid = Strings.get("bitFinderLowLabel");
bot = "0";
} else if (type == HIGH_ONE) {
mid = Strings.get("bitFinderHighLabel");
bot = "1";
} else {
mid = Strings.get("bitFinderLowLabel");
bot = "1";
}
Bounds bds = painter.getBounds();
int x = bds.getX() + bds.getWidth() / 2;
int y0 = bds.getY();
GraphicsUtil.drawCenteredText(g, top, x, y0 + 8);
GraphicsUtil.drawCenteredText(g, mid, x, y0 + 20);
GraphicsUtil.drawCenteredText(g, bot, x, y0 + 32);
}
}