Author: autrijus Date: Wed Apr 26 10:05:19 2006 New Revision: 8961 Modified: doc/trunk/design/syn/S02.pod
Log: * Further note that Ps/Pe dominates BidiMirroring, so U+298D maps to U+298E, and U+298E itself does not open brackets. Modified: doc/trunk/design/syn/S02.pod ============================================================================== --- doc/trunk/design/syn/S02.pod (original) +++ doc/trunk/design/syn/S02.pod Wed Apr 26 10:05:19 2006 @@ -52,19 +52,23 @@ from non-bracketing. Bracketing characters are defined as any Unicode characters with either bidirectional mirrorings or Ps/Pe properties. +In practice, though, you're safest using matching characters with +Ps/Pe properties, though ASCII angle brackets are a notable exception, +since they're bidirectional but not in the Ps/Pe set. + Characters with no corresponding closing characters does not qualify as opening brackets. This includes the second section of the BidiMirroring data table, as well as C<U+201A> and C<U+201E>. +If a character is already used in Ps/Pe mappings, then its entry in +BidiMirroring is ignored. Therefore C<U+298D> maps to C<U+298E>, +not C<U+2990>, and C<U+298E> itself is not a valid bracket opener. + The C<U+301D> has two closing alternatives, C<U+301E> and C<U+301F>; Perl 6 only recognizes the one with lower code point number, C<U+301E>, as the closing brace. This policy also applies to new one-to-many mappings introduced in the future. -In practice, though, you're safest using matching characters with -Ps/Pe properties, though ASCII angle brackets are a notable exception, -since they're bidirectional but not in the Ps/Pe set. - =back =head1 Molecules
