[jira] Commented: (LANG-646) StringEscapeUtils.unescapeJava doesn't handle octal escapes and Unicode with extra u

["Henri Yandell (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LANG-646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12907110#action_12907110 ] 

Henri Yandell commented on LANG-646:
------------------------------------

Escaper is easy to write; unescaper is a bit of a pain. Ideally the generic unescaper would know how to escape '\\510' happily, but Java adds the constraints of a max of 377, leading to that being inferred as '\\51' + '0'. Thus the unescaper needs to have a configurable range, and as it plucks numbers off the text it needs to check if has gone beyond the maximum size.


> StringEscapeUtils.unescapeJava doesn't handle octal escapes and Unicode with extra u
> ------------------------------------------------------------------------------------
>
>                 Key: LANG-646
>                 URL: https://issues.apache.org/jira/browse/LANG-646
>             Project: Commons Lang
>          Issue Type: Bug
>          Components: lang.*
>    Affects Versions: 2.5
>         Environment: Irrelevant
>            Reporter: polygenelubricants
>            Priority: Minor
>
> CODE TO REPRODUCE BUG:
> {noformat}
> System.out.println("\45");
> // %
> System.out.println(StringEscapeUtils.unescapeJava("\\45"));
> // 45, should be %
> System.out.println("\uu0030");
> // 0
> System.out.println(StringEscapeUtils.unescapeJava("\\uu0030"));
> // throws NestableRuntimeException:
> {noformat}
> This is not compliant with the JLS, which allows both [OctalEscape] and extraneous u for [UnicodeMarker] in Java string literal.
> REFERENCES:
> 3.10.6 Escape Sequences for Character and String Literals
> http://java.sun.com/docs/books/jls/third_edition/html/lexical.html#3.10.6
> 3.3 Unicode Escapes
> http://java.sun.com/docs/books/jls/third_edition/html/lexical.html#3.3
> EXTERNAL LINKS:
> http://stackoverflow.com/questions/3537706/howto-unescape-a-java-string-literal-in-java/

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