Author: larry
Date: Mon Mar 12 13:30:46 2007
New Revision: 14339
Modified:
doc/trunk/design/syn/S02.pod
doc/trunk/design/syn/S03.pod
doc/trunk/design/syn/S04.pod
doc/trunk/design/syn/S06.pod
Log:
Various clarifications suggested by TheDamian++
Explicit pipe target is now @(*) or @@(*).
Separated clobbering == == from pushy == and ==
Pushy pipes can now be stacked on filters as well as sinks.
$?BLOCK and other contexts now consistently return a list of labels.
Modified: doc/trunk/design/syn/S02.pod
==
--- doc/trunk/design/syn/S02.pod(original)
+++ doc/trunk/design/syn/S02.podMon Mar 12 13:30:46 2007
@@ -12,9 +12,9 @@
Maintainer: Larry Wall [EMAIL PROTECTED]
Date: 10 Aug 2004
- Last Modified: 11 Mar 2007
+ Last Modified: 12 Mar 2007
Number: 2
- Version: 94
+ Version: 95
This document summarizes Apocalypse 2, which covers small-scale
lexical items and typological issues. (These Synopses also contain
@@ -1648,7 +1648,7 @@
@?ROUTINE Which nested routines am I in?
?BLOCK Which block am I in?
@?BLOCK Which nested blocks am I in?
-$?LABEL Which block label am I in?
+$?LABEL Which innermost block label am I in?
@?LABEL Which nested block labels am I in?
All the nested C@? variables are ordered from the innermost to the
@@ -2472,8 +2472,8 @@
line number range within the source file.
The lexical routine itself is C?ROUTINE; you can get its name with
-CROUTINE.name. The current block is C?BLOCK. If the block has a label,
-that shows up in C?BLOCK.label. Within the lexical scope of
+CROUTINE.name. The current block is C?BLOCK. If the block has any
+labels, those shows up in C?BLOCK.labels. Within the lexical scope of
a statement with a label, the label is a pseudo-object representing
the dynamic context of that statement. (If inside multiple dynamic
instances of that statement, the label represents the innermost one.)
Modified: doc/trunk/design/syn/S03.pod
==
--- doc/trunk/design/syn/S03.pod(original)
+++ doc/trunk/design/syn/S03.podMon Mar 12 13:30:46 2007
@@ -14,7 +14,7 @@
Date: 8 Mar 2004
Last Modified: 12 Mar 2007
Number: 3
- Version: 107
+ Version: 108
=head1 Overview
@@ -50,7 +50,7 @@
List prefix = : print push say die map substr ... [+] [*] any all
Loose and and
Loose oror xor err
-Terminator ; ==, ==, {...}, modifiers, unmatched ), ], }
+Terminator ; ==, ==, ==, ==, {...}, modifiers, extra ), ], }
If you don't see your favorite operator there, the following
sections cover all the operators in precedence order. Basic operator
@@ -1393,10 +1393,24 @@
=item *
-Feed operators: ==, ==
+Feed operators: ==, ==, ==, ==
source() == filter() == sink()
+The forms with the double angle append rather than clobber the sink's
+todo list. The C == form always looks ahead for an appropriate
+target to append to, either the final sink in the chain, or the next
+filter stage with an explicit C@(*) or C@@(*) target. This means
+you can stack multiple feeds onto one filter command:
+
+source1() ==
+source2() ==
+source3() ==
+filter(@(*)) == sink()
+
+Similar semantics apply to C == except it looks backward for
+an appropriate target to append to.
+
=item *
Control block: ws{...}
@@ -2521,7 +2535,7 @@
$hacker.feed:xxx('Pizza and cola');
-is tokenized as an adverb applying to the method:
+is tokenized as an adverb applying to the method as its preceding operator:
$hacker.feed :xxx('Pizza and cola');
@@ -2529,7 +2543,8 @@
$hacker.feed: xxx('Pizza and cola'); # wrong
-If you want both meanings of colon, you have to put it twice:
+If you want both meanings of colon in order to supply both an adverb
+and some positional arguments, you have to put the colon twice:
$hacker.feed: :xxx('Pizza and cola'), 1,2,3;
@@ -3366,27 +3381,30 @@
=head1 Traversing arrays in parallel
-In order to support parallel iteration over multiple arrays, Perl 6 has
-a Czip function that builds CSeq objects from the elements of two or more
-arrays.
+In order to support parallel iteration over multiple arrays, Perl 6
+has a Czip function that builds a list of CSeq objects from the
+elements of two or more arrays. In ordinary list context this behaves
+as a list of CCaptures and automatically flattens.
-for zip(@names; @codes) - [$name, $zip] {
+for zip(@names; @codes) - $name, $zip {
print Name: $name; Zip code: $zip\n;
}
Czip has an infix synonym, the CZ operator.
-To read arrays in parallel like Czip but just sequence the values
-rather than generating tuples, use Ceach instead of Czip.
+In an explicitly multidimensional list context, however, the sequences
+turn into subarrays,
