From 52687a403376b08282310846ed221789bdb50b8a Mon Sep 17 00:00:00 2001
From: - <->
Date: Sat, 24 Nov 2012 17:13:48 -0800
Subject: [PATCH] Work on SL if: t+

---
 blog/sl/error.pl             | 41 ++++++++++++++++++++++--------------
 r2/lib/Marpa/R2/Stuifzand.pm |  8 +++++--
 2 files changed, 31 insertions(+), 18 deletions(-)

diff --git a/blog/sl/error.pl b/blog/sl/error.pl
index 3029f1d0f..a883f51f8 100644
--- a/blog/sl/error.pl
+++ b/blog/sl/error.pl
@@ -22,23 +22,35 @@
 
 my $prefix_grammar = Marpa::R2::Grammar->new(
     {   start          => 'Script',
-        actions        => 'My_Actions',
+        action_object        => 'My_Actions',
         default_action => 'do_arg0',
         rules          => [ <<'END_OF_RULES' ]
 Script ::=
-     Expression
-   | [s] [a] [y] :ws Expression action => do_arg1
+     :ows Expression :ows
+   | :ows ([s] [a] [y]) :ows Expression
 Expression ::=
-     :ows Number :ows
-   | :ows [+] :ows Expression :ows action => do_add
+     Number
+   | ([+]) :ows Expression :ows Expression action => do_add
 Number ::= [\d] + action => do_number
 END_OF_RULES
     }
 );
 
-sub My_Actions::do_add  { shift; return $_[1] + $_[2] }
-sub My_Actions::do_arg0 { shift; return shift; }
-sub My_Actions::do_arg1 { shift; return $_[1]; }
+package My_Actions;
+our $SELF;
+sub new { return $SELF }
+sub do_number  {
+   my $self = shift;
+   my ($start, $end) = Marpa::R2::Context::location();
+   return substr ${$self->{input}}, $start, $end-$start;
+}
+sub do_add  { shift;
+# say +(scalar @_), " args: ", join "; ", @_;
+return $_[0] + $_[1] }
+sub do_arg0 { shift; return shift; }
+sub do_arg1 { shift; return $_[1]; }
+
+package main;
 
 $prefix_grammar->precompute();
 
@@ -105,15 +117,12 @@ sub My_Error::show_position {
 
 sub my_parser {
     my ( $grammar, $string ) = @_;
-    my $recce = Marpa::R2::Recognizer->new( { grammar => $grammar } );
 
-    # A quasi-object, for internal use only
-    my $self = bless {
-        grammar   => $grammar,
-        input     => \$string,
-        recce     => $recce,
-        },
-        'My_Error';
+    my $self = bless { grammar => $grammar, input => \$string, }, 'My_Error';
+    local $My_Actions::SELF = $self;
+
+    my $recce = Marpa::R2::Recognizer->new( { grammar => $grammar } );
+    $self->{recce} = $recce;
 
     $recce->read_string($string);
     my $value_ref = $recce->value;
diff --git a/r2/lib/Marpa/R2/Stuifzand.pm b/r2/lib/Marpa/R2/Stuifzand.pm
index a724e8ef5..a59e75591 100644
--- a/r2/lib/Marpa/R2/Stuifzand.pm
+++ b/r2/lib/Marpa/R2/Stuifzand.pm
@@ -33,6 +33,7 @@ use constant HIDE => 1;
 
 sub new { my $class = shift; return bless { name => $_[NAME], is_hidden => ($_[HIDE]//0) }, $class }
 sub name { return $_[0]->{name} }
+sub names { return $_[0]->{name} }
 sub is_hidden { return $_[0]->{is_hidden} }
 sub hidden_set { $_[0]->{is_hidden} = 1; }
 sub symbols { return $_[0]; }
@@ -42,7 +43,10 @@ package Marpa::R2::Internal::Stuifzand::Symbol_List;
 sub new { my $class = shift; return bless [@_], $class }
 
 sub names {
-    return map { $_->name() } @{ $_[0] };
+    return map { $_->names() } @{ $_[0] };
+}
+sub is_hidden {
+    return map { $_->is_hidden() } @{ $_[0] };
 }
 
 sub hidden_set {
@@ -50,7 +54,7 @@ sub hidden_set {
 }
 
 sub mask {
-    return map { !$_->is_hidden() } @{ $_[0] };
+    return map { ! $_ } map { $_->is_hidden() } @{ $_[0] };
 }
 
 sub symbols { return @{ $_[0] }; }