/**
* Converts a range of a string to an array of code points.
*
* @param charSequence the source string.
* @param startIndex the start index inside the string in java chars, inclusive.
* @param endIndex the end index inside the string in java chars, exclusive.
* @return a new array of code points. At most endIndex - startIndex, but possibly less.
*/
public static int[] toCodePointArray(
final CharSequence charSequence, final int startIndex, final int endIndex) {
final int length = charSequence.length();
if (length <= 0) {
return EMPTY_CODEPOINTS;
}
final int[] codePoints = new int[Character.codePointCount(charSequence, startIndex, endIndex)];
copyCodePointsAndReturnCodePointCount(
codePoints, charSequence, startIndex, endIndex, false /* downCase */);
return codePoints;
}
