RFR - JDK-8202442 - String::unescape (Code Review)

Jim Laskey james.laskey at oracle.com
Tue Sep 18 18:55:48 UTC 2018

The intent, of course, is to offset the raw string literals non-translation of Unicode escapes and escape sequences. That is, have the multi-line cake and eat the escapes too.

So a developer could have

	String s = `


to have tabs inserted in the string.

"\\" "\u005c\u005c" and `\` all translate to the same string. `\u005c` translates to "\\u005c”. `\u005c`.unescape() thustranslates to be the same as "\\”, "\u005c\u005c" and `\`.


— Jim

> On Sep 18, 2018, at 3:33 PM, Jonathan Gibbons <jonathan.gibbons at oracle.com> wrote:
> Jim,
> In JLS, and hence javac, Unicode escape handling happens early on at a low level, before string escape handling. This means that it is technically possible to write string escape sequences in terms of Unicode escapes.
> I'm not suggesting you should do the same here, but you should be aware of the difference, compared to javac behavior.
> -- Jon
> On 9/18/18 10:51 AM, Jim Laskey wrote:
>> Please review the code for String::unescape. Used to translate escape sequences in a string, typically in a raw string literal, into characters represented by those escapes.
>> webrev: http://cr.openjdk.java.net/~jlaskey/8202442/webrev/index.html
>> jbs: https://bugs.openjdk.java.net/browse/JDK-8202442
>> csr: https://bugs.openjdk.java.net/browse/JDK-8202443
>> Cheers,
>> — Jim

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