Template::Tiny support for text filtering

[catagits/HTML-Zoom.git] / lib / HTML / Zoom / FilterBuilder.pm

diff --git a/lib/HTML/Zoom/FilterBuilder.pm b/lib/HTML/Zoom/FilterBuilder.pm
index 19cc818..316d56c 100644 (file)
--- a/lib/HTML/Zoom/FilterBuilder.pm
+++ b/lib/HTML/Zoom/FilterBuilder.pm
@@ -1,36 +1,28 @@
 package HTML::Zoom::FilterBuilder;
 
-use Devel::Dwarn;
-
 use strict;
 use warnings FATAL => 'all';
+use base qw(HTML::Zoom::SubObject);
 use HTML::Zoom::CodeStream;
 
-sub new { bless({}, shift) }
-
 sub _stream_from_code {
-  HTML::Zoom::CodeStream->new({ code => $_[1] })
+  shift->_zconfig->stream_utils->stream_from_code(@_)
 }
 
 sub _stream_from_array {
-  shift; # lose $self
-  HTML::Zoom::CodeStream->from_array(@_)
+  shift->_zconfig->stream_utils->stream_from_array(@_)
+}
+
+sub _stream_from_proto {
+  shift->_zconfig->stream_utils->stream_from_proto(@_)
 }
 
 sub _stream_concat {
-  shift; # lose $self
-  my @streams = @_;
-  my $cur_stream = shift(@streams) or die "No streams passed";
-  HTML::Zoom::CodeStream->new({
-    code => sub {
-      return unless $cur_stream;
-      my $evt;
-      until (($evt) = $cur_stream->next) {
-        return unless $cur_stream = shift(@streams);
-      }
-      return $evt;
-    }
-  });
+  shift->_zconfig->stream_utils->stream_concat(@_)
+}
+
+sub _flatten_stream_of_streams {
+  shift->_zconfig->stream_utils->flatten_stream_of_streams(@_)
 }
 
 sub set_attribute {
@@ -82,7 +74,8 @@ sub remove_attribute {
 
 sub collect {
   my ($self, $options) = @_;
-  my ($into, $passthrough, $inside) = @{$options}{qw(into passthrough inside)};
+  my ($into, $passthrough, $content, $filter) =
+    @{$options}{qw(into passthrough content filter)};
   sub {
     my ($evt, $stream) = @_;
     # We wipe the contents of @$into here so that other actions depending
@@ -90,15 +83,16 @@ sub collect {
     # I -suspect- it's better for that state reset to be managed here; if it
     # ever becomes painful the decision should be revisited
     if ($into) {
-      @$into = $inside ? () : ($evt);
+      @$into = $content ? () : ($evt);
     }
     if ($evt->{is_in_place_close}) {
-      return $evt if $passthrough || $inside;
+      return $evt if $passthrough || $content;
       return;
     }
     my $name = $evt->{name};
     my $depth = 1;
-    my $_next = $inside ? 'peek' : 'next';
+    my $_next = $content ? 'peek' : 'next';
+    $stream = do { local $_ = $stream; $filter->($stream) } if $filter;
     my $collector = $self->_stream_from_code(sub {
       return unless $stream;
       while (my ($evt) = $stream->$_next) {
@@ -106,21 +100,26 @@ sub collect {
         $depth-- if ($evt->{type} eq 'CLOSE');
         unless ($depth) {
           undef $stream;
-          return if $inside;
+          return if $content;
           push(@$into, $evt) if $into;
           return $evt if $passthrough;
           return;
         }
         push(@$into, $evt) if $into;
-        $stream->next if $inside;
+        $stream->next if $content;
         return $evt if $passthrough;
       }
       die "Never saw closing </${name}> before end of source";
     });
-    return ($passthrough||$inside) ? [ $evt, $collector ] : $collector;
+    return ($passthrough||$content) ? [ $evt, $collector ] : $collector;
   };
 }
 
+sub collect_content {
+  my ($self, $options) = @_;
+  $self->collect({ %{$options||{}}, content => 1 })
+}
+
 sub add_before {
   my ($self, $events) = @_;
   sub { return $self->_stream_from_array(@$events, $_[0]) };
@@ -139,7 +138,7 @@ sub add_after {
   };
 }
 
-sub prepend_inside {
+sub prepend_content {
   my ($self, $events) = @_;
   sub {
     my ($evt) = @_;
@@ -153,9 +152,9 @@ sub prepend_inside {
   };
 }
 
-sub append_inside {
+sub append_content {
   my ($self, $events) = @_;
-  my $coll_proto = $self->collect({ passthrough => 1, inside => 1 });
+  my $coll_proto = $self->collect({ passthrough => 1, content => 1 });
   sub {
     my ($evt) = @_;
     if ($evt->{is_in_place_close}) {
@@ -171,11 +170,11 @@ sub append_inside {
 }
 
 sub replace {
-  my ($self, $events, $options) = @_;
+  my ($self, $replace_with, $options) = @_;
   my $coll_proto = $self->collect($options);
   sub {
     my ($evt, $stream) = @_;
-    my $emit = $self->_stream_from_array(@$events);
+    my $emit = $self->_stream_from_proto($replace_with);
     my $coll = &$coll_proto;
     # For a straightforward replace operation we can, in fact, do the emit
     # -before- the collect, and my first cut did so. However in order to
@@ -194,4 +193,52 @@ sub replace {
   };
 }
 
+sub replace_content {
+  my ($self, $replace_with, $options) = @_;
+  $self->replace($replace_with, { %{$options||{}}, content => 1 })
+}
+
+sub repeat {
+  my ($self, $repeat_for, $options) = @_;
+  $options->{into} = \my @into;
+  my @between;
+  my $repeat_between = delete $options->{repeat_between};
+  if ($repeat_between) {
+    $options->{filter} = sub {
+      $_->select($repeat_between)->collect({ into => \@between })
+    };
+  }
+  my $repeater = sub {
+    my $s = $self->_stream_from_proto($repeat_for);
+    # We have to test $repeat_between not @between here because
+    # at the point we're constructing our return stream @between
+    # hasn't been populated yet - but we can test @between in the
+    # map routine because it has been by then and that saves us doing
+    # the extra stream construction if we don't need it.
+    $self->_flatten_stream_of_streams(do {
+      if ($repeat_between) {
+        $s->map(sub {
+              local $_ = $self->_stream_from_array(@into);
+              (@between && $s->peek)
+                ? $self->_stream_concat(
+                    $_[0]->($_), $self->_stream_from_array(@between)
+                  )
+                : $_[0]->($_)
+            })
+      } else {
+        $s->map(sub {
+              local $_ = $self->_stream_from_array(@into);
+              $_[0]->($_)
+          })
+      }
+    })
+  };
+  $self->replace($repeater, $options);
+}
+
+sub repeat_content {
+  my ($self, $repeat_for, $options) = @_;
+  $self->repeat($repeat_for, { %{$options||{}}, content => 1 })
+}
+
 1;