/**
* Creates a new character set which matches a character if that character matches either the
* {@code left} or {@code right} character sets.
*
* <p>left | right
*
* @param left The left source character set.
* @param right The right source character set.
*/
public static Chset union(Chset left, Chset right) {
Chset n = left.clone();
for (Range r : right.ranges) {
n.set(r);
}
return n;
}
/**
* Class constructor that initializes a {@code Chset} from a string specification.
*
* @param spec The string specification to initialize the {@code Chset} from.
*/
public Chset(String spec) {
for (int i = 0; i < spec.length(); ) {
final char s = spec.charAt(i);
if ((i + 1) < spec.length()) {
final char n = spec.charAt(i + 1);
if (n == '-') {
if ((i + 2) < spec.length()) {
final char e = spec.charAt(i + 2);
set(new Range(s, e));
i += 3;
continue;
} else {
set(new Range(s, s));
set(new Range('-', '-'));
break;
}
}
}
set(new Range(s, s));
i += 1;
}
}
/** @see #set(Range) */
protected void set(char min, char max) {
set(new Range(min, max));
}