Author: lwall
Date: 2010-03-06 14:55:38 +0100 (Sat, 06 Mar 2010)
New Revision: 29953
Modified:
docs/Perl6/Spec/S05-regex.pod
Log:
[S05] kill {*} and #=
Modified: docs/Perl6/Spec/S05-regex.pod
===================================================================
--- docs/Perl6/Spec/S05-regex.pod 2010-03-06 12:09:42 UTC (rev 29952)
+++ docs/Perl6/Spec/S05-regex.pod 2010-03-06 13:55:38 UTC (rev 29953)
@@ -16,8 +16,8 @@
Created: 24 Jun 2002
- Last Modified: 2 Feb 2010
- Version: 115
+ Last Modified: 6 Mar 2010
+ Version: 116
This document summarizes Apocalypse 5, which is about the new regex
syntax. We now try to call them I<regex> rather than "regular
@@ -3779,34 +3779,6 @@
MyGrammar.parse($str, :actions($action-object))
-Whenever a closure within the grammar returns a C<Whatever> object, the
-grammar engine tries to call a method of the same name as the name of the
-current regex on the actions object, passing along the current C<Match>
-object as the first positional argument, and the tag of the reduction (if
-any) as the second argument. The tag is supplied via a C<#=> comment later
-on the same line as the C<{*}>. There must be whitespace between the C<#=>
-and the tag, but the tag itself may contain spaces.
-
- grammar Integer {
- token TOP {
- | 0b(<[01]>+) {*} #= binary
- | \d+ {*} #= decimal
- }
- }
- class Twice {
- multi method TOP($/, $tag) {
- my $value = $tag eq 'binary' ?? :2($0) !! +$/;
- make 2 * $value;
- }
- }
- say Integer.parse('21', :actions(Twice.new)).ast; # 42
- say Integer.parse('0b10101', :actions(Twice.new)).ast; # 42
-
-A C<{*}> is assumed at the end of every rule, and the method is
-called with no tag argument. Note that the implicit C<{*}> is
-I<outside> the alternation in the C<TOP> rule above, despite
-the fact that no explicit square brackets were used.
-
=back
=head1 Syntactic categories
