* The general syntax is:
* [!][o][odd][e][even]start-end
*
* You can have multiple ranges separated by commas ','. The '!' modifier removes the
* range from what is already selected. The range changes are incremental, that is,
* numbers are added or deleted as the range appears. The start or the end, but not both, can be omitted.
*/
public class SequenceList {
protected static final int COMMA = 1;
protected static final int MINUS = 2;
protected static final int NOT = 3;
protected static final int TEXT = 4;
protected static final int NUMBER = 5;
protected static final int END = 6;
protected static final char EOT = '\uffff';
private static final int FIRST = 0;
private static final int DIGIT = 1;
private static final int OTHER = 2;
private static final int DIGIT2 = 3;
private static final String NOT_OTHER = "-,!0123456789";
protected char text[];
protected int ptr;
protected int number;
protected String other;
protected int low;
protected int high;
protected boolean odd;
protected boolean even;
protected boolean inverse;
protected SequenceList(String range) {
ptr = 0;
text = range.toCharArray();
}
protected char nextChar() {
while (true) {
if (ptr >= text.length)
return EOT;
char c = text[ptr++];
if (c > ' ')
return c;
}
}
protected void putBack() {
--ptr;
if (ptr < 0)
ptr = 0;
}
protected int getType() {
StringBuffer buf = new StringBuffer();
int state = FIRST;
while (true) {
char c = nextChar();
if (c == EOT) {
if (state == DIGIT) {
number = Integer.parseInt(other = buf.toString());
return NUMBER;
}
else if (state == OTHER) {
other = buf.toString().toLowerCase();
return TEXT;
}
return END;
}
switch (state) {
case FIRST:
switch (c) {
case '!':
return NOT;
case '-':
return MINUS;
case ',':
return COMMA;
}
buf.append(c);
if (c >= '0' && c <= '9')
state = DIGIT;
else
state = OTHER;
break;
case DIGIT:
if (c >= '0' && c <= '9')
buf.append(c);
else {
putBack();
number = Integer.parseInt(other = buf.toString());
return NUMBER;
}
break;
case OTHER:
if (NOT_OTHER.indexOf(c) < 0)
buf.append(c);
else {
putBack();
other = buf.toString().toLowerCase();
return TEXT;
}
break;
}
}
}
private void otherProc() {
if (other.equals("odd") || other.equals("o")) {
odd = true;
even = false;
}
else if (other.equals("even") || other.equals("e")) {
odd = false;
even = true;
}
}
protected boolean getAttributes() {
low = -1;
high = -1;
odd = even = inverse = false;
int state = OTHER;
while (true) {
int type = getType();
if (type == END || type == COMMA) {
if (state == DIGIT)
high = low;
return type == END;
}
switch (state) {
case OTHER:
switch (type) {
case NOT:
inverse = true;
break;
case MINUS:
state = DIGIT2;
break;
default:
if (type == NUMBER) {
low = number;
state = DIGIT;
}
else
otherProc();
break;
}
break;
case DIGIT:
switch (type) {
case NOT:
inverse = true;
state = OTHER;
high = low;
break;
case MINUS:
state = DIGIT2;
break;
default:
high = low;
state = OTHER;
otherProc();
break;
}
break;
case DIGIT2:
switch (type) {
case NOT:
inverse = true;
state = OTHER;
break;
case MINUS:
break;
case NUMBER:
high = number;
state = OTHER;
break;
default:
state = OTHER;
otherProc();
break;
}
break;
}
}
}
/**
* Generates a list of numbers from a string.
* @param ranges the comma separated ranges
* @param maxNumber the maximum number in the range
* @return a list with the numbers as Integer
*/
public static List