/**
* Move the cursor <i>where</i> characters, withough checking the current buffer.
*
* @see #where
* @param where the number of characters to move to the right or left.
*/
private final void moveInternal(final int where) throws IOException {
// debug ("move cursor " + where + " ("
// + buf.cursor + " => " + (buf.cursor + where) + ")");
buf.cursor += where;
char c;
if (where < 0) {
int len = 0;
for (int i = buf.cursor; i < buf.cursor - where; i++) {
if (buf.getBuffer().charAt(i) == '\t') len += TAB_WIDTH;
else len++;
}
char cbuf[] = new char[len];
Arrays.fill(cbuf, BACKSPACE);
out.write(cbuf);
return;
} else if (buf.cursor == 0) {
return;
} else if (mask != null) {
c = mask.charValue();
} else {
printCharacters(buf.buffer.substring(buf.cursor - where, buf.cursor).toCharArray());
return;
}
// null character mask: don't output anything
if (NULL_MASK.equals(mask)) {
return;
}
printCharacters(c, Math.abs(where));
}
/** Output the specified character, both to the buffer and the output stream. */
private final void putChar(final int c, final boolean print) throws IOException {
buf.write((char) c);
if (print) {
// no masking...
if (mask == null) {
printCharacter(c);
}
// null mask: don't print anything...
else if (mask.charValue() == 0) {;
}
// otherwise print the mask...
else {
printCharacter(mask.charValue());
}
drawBuffer();
}
}
/**
* Redraw the rest of the buffer from the cursor onwards. This is necessary for inserting text
* into the buffer.
*
* @param clear the number of characters to clear after the end of the buffer
*/
private final void drawBuffer(final int clear) throws IOException {
// debug ("drawBuffer: " + clear);
char[] chars = buf.buffer.substring(buf.cursor).toCharArray();
if (mask != null) Arrays.fill(chars, mask.charValue());
printCharacters(chars);
clearAhead(clear);
back(chars.length);
flushConsole();
}