@CompilerDirectives.SlowPath
@Specialization(order = 1)
public Object getIndex(RubyString string, int index, UndefinedPlaceholder undefined) {
final String javaString = string.toString();
final int normalisedIndex = ArrayUtilities.normaliseIndex(javaString.length(), index);
return getContext().makeString(javaString.charAt(normalisedIndex));
}
@CompilerDirectives.SlowPath
@Specialization(order = 2)
public Object getIndex(RubyString string, FixnumRange range, UndefinedPlaceholder undefined) {
final String javaString = string.toString();
final int stringLength = javaString.length();
if (range.doesExcludeEnd()) {
final int begin = ArrayUtilities.normaliseIndex(stringLength, range.getBegin());
final int exclusiveEnd =
ArrayUtilities.normaliseExclusiveIndex(stringLength, range.getExclusiveEnd());
return getContext().makeString(javaString.substring(begin, exclusiveEnd));
} else {
final int begin = ArrayUtilities.normaliseIndex(stringLength, range.getBegin());
final int inclusiveEnd =
ArrayUtilities.normaliseIndex(stringLength, range.getInclusiveEnd());
return getContext().makeString(javaString.substring(begin, inclusiveEnd + 1));
}
}