Reject sign characters in UnicodeUnescaper hex values#1721
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UnicodeUnescaper.translatereads the four-character value of a\uXXXXescape withInteger.parseInt(value, 16), which tolerates a leading sign.\u-047decodes toU+FFB9rather than being rejected, becauseparseInt("-047", 16)returns-71.\u02-3already throwsIllegalArgumentException, so accepting a leading sign is inconsistent.Reject a leading
+/-in the value field before parsing. The documentedu+notation (\u+0047) is unaffected.Repro:
new UnicodeUnescaper().translate("\\u-047")Expected:
IllegalArgumentExceptionActual: returns the string
\uFFB9