@Override
public Object execute(VirtualFrame frame) {
if (RubyGuards.isRubyString(ForeignAccess.getReceiver(frame))) {
final DynamicObject string = (DynamicObject) ForeignAccess.getReceiver(frame);
final int index = (int) ForeignAccess.getArguments(frame).get(labelIndex);
if (index >= Layouts.STRING.getRope(string).byteLength()) {
return 0;
} else {
return (byte) StringOperations.getByteListReadOnly(string).get(index);
}
} else {
CompilerDirectives.transferToInterpreter();
throw new IllegalStateException("Not implemented");
}
}
public static boolean isValidUtf8(DynamicObject string) {
assert RubyGuards.isRubyString(string);
return StringOperations.isCodeRangeValid(string)
&& Layouts.STRING.getRope(string).getEncoding().isUTF8();
}
public static boolean isBrokenCodeRange(DynamicObject string) {
assert RubyGuards.isRubyString(string);
return StringOperations.codeRange(string) == CodeRange.CR_BROKEN;
}
public static boolean is7Bit(DynamicObject string) {
assert RubyGuards.isRubyString(string);
return StringOperations.codeRange(string) == CodeRange.CR_7BIT;
}