private static String getShortPropertyName(int property) {
		String propertyName = UCharacter.getPropertyName(property, UProperty.NameChoice.SHORT);
		// For some reason, a few properties only have long names.
		if (propertyName == null) {
			propertyName = UCharacter.getPropertyName(property, UProperty.NameChoice.LONG);
		}
		return propertyName;
	}
StringTemplate controller used to generate parameters to feed
to {@code unicodedata.st} to code-generate {@code UnicodeData.java},
used by the tool for Unicode property escapes like {@code \\p\{Lu\}}.

Uses ICU to iterate over Unicode character categories, properties,
and script codes, as well as aliases for those codes.

This class exists in its own Maven module to avoid adding a
dependency from the tool onto the (large) ICU runtime.
tool/src/org/antlr/v4/unicode/UnicodeDataTemplateController.java