/* 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.io;
import java.util.Arrays;
import com.cburch.logisim.data.Value;
import com.cburch.logisim.gui.start.TtyInterface;
import com.cburch.logisim.instance.InstanceData;
class TtyState implements InstanceData, Cloneable {
private Value lastClock;
private String[] rowData;
private int colCount;
private StringBuffer lastRow;
private int row;
private boolean sendStdout;
public TtyState(int rows, int cols) {
lastClock = Value.UNKNOWN;
rowData = new String[rows - 1];
colCount = cols;
lastRow = new StringBuffer(cols);
sendStdout = false;
clear();
}
@Override
public TtyState clone() {
try {
TtyState ret = (TtyState) super.clone();
ret.rowData = this.rowData.clone();
return ret;
} catch (CloneNotSupportedException e) {
return null;
}
}
public Value setLastClock(Value newClock) {
Value ret = lastClock;
lastClock = newClock;
return ret;
}
public void setSendStdout(boolean value) {
sendStdout = value;
}
public void clear() {
Arrays.fill(rowData, "");
lastRow.delete(0, lastRow.length());
row = 0;
}
public String getRowString(int index) {
if (index < row) return rowData[index];
else if (index == row) return lastRow.toString();
else return "";
}
public int getCursorRow() {
return row;
}
public int getCursorColumn() {
return lastRow.length();
}
public void add(char c) {
if (sendStdout) {
TtyInterface.sendFromTty(c);
}
int lastLength = lastRow.length();
switch (c) {
case 12: // control-L
row = 0;
lastRow.delete(0, lastLength);
Arrays.fill(rowData, "");
break;
case '\b': // backspace
if (lastLength > 0) lastRow.delete(lastLength - 1, lastLength);
break;
case '\n': case '\r': // newline
commit();
break;
default:
if (!Character.isISOControl(c)) {
if (lastLength == colCount) commit();
lastRow.append(c);
}
}
}
private void commit() {
if (row >= rowData.length) {
System.arraycopy(rowData, 1, rowData, 0, rowData.length - 1);
rowData[row - 1] = lastRow.toString();
} else {
rowData[row] = lastRow.toString();
row++;
}
lastRow.delete(0, lastRow.length());
}
public void updateSize(int rows, int cols) {
int oldRows = rowData.length + 1;
if (rows != oldRows) {
String[] newData = new String[rows - 1];
if (rows > oldRows // rows have been added,
|| row < rows - 1) { // or rows removed but filled rows fit
System.arraycopy(rowData, 0, newData, 0, row);
Arrays.fill(newData, row, rows - 1, "");
} else { // rows removed, and some filled rows must go
System.arraycopy(rowData, row - rows + 1, newData, 0, rows - 1);
row = rows - 1;
}
rowData = newData;
}
int oldCols = colCount;
if (cols != oldCols){
colCount = cols;
if (cols < oldCols) { // will need to trim any long rows
for (int i = 0; i < rows - 1; i++) {
String s = rowData[i];
if (s.length() > cols) rowData[i] = s.substring(0, cols);
}
if (lastRow.length() > cols) {
lastRow.delete(cols, lastRow.length());
}
}
}
}
}