MySQL Bugs: #68142: UCA / LDML parser does not complain about invalid/unsupported backslash sequence

Bug #68142	UCA / LDML parser does not complain about invalid/unsupported backslash sequence
Submitted:	22 Jan 2013 14:45	Modified:	22 Jan 2013 18:31
Reporter:	Hartmut Holzgraefe	Email Updates:
Status:	Verified	Impact on me:	None
Category:	MySQL Server: Charsets	Severity:	S3 (Non-critical)
Version:	mysql-5.6.9	OS:	Any
Assigned to:		CPU Architecture:	Any

Description:
According to the documentation (and the code AFAICT) the only kind of backslash sequences supported/allowed are \u... sequences that specify a unicode code point by its hexadecimal code point number after the \u

Forgetting the 'u' after '\' does not raise any errors though ...

How to repeat:

  <collation name="utf8_test" id="253">
    <rules>
     <reset>A</reset>
     <p>\00c4</p><!-- should be Ä. missing 'u' here -->
     <t>\u00e4</t><!-- ä -->
    </rules>
  </collation>

Suggested fix:
Verify that a \ is followed by a valid/supported sequence ...

Thank you for the report.

Verified as described.

Quote of the documentation at http://dev.mysql.com/doc/refman/5.6/en/ldml-rules.html: "Characters named in LDML rules can be written literally or in \unnnn format, where nnnn is the hexadecimal Unicode code point value."