Added apply_if to only run an apply block if a predicate is true

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

diff --git a/lib/HTML/Zoom/StreamBase.pm b/lib/HTML/Zoom/StreamBase.pm
index 7584ed6..e063c48 100644 (file)
--- a/lib/HTML/Zoom/StreamBase.pm
+++ b/lib/HTML/Zoom/StreamBase.pm
@@ -2,5 +2,101 @@ package HTML::Zoom::StreamBase;
 
 use strict;
 use warnings FATAL => 'all';
+use HTML::Zoom::TransformBuilder;
+
+sub _zconfig { shift->{_zconfig} }
+
+sub peek {
+  my ($self) = @_;
+  if (exists $self->{_peeked}) {
+    return ($self->{_peeked});
+  }
+  if (my ($peeked) = $self->_next(1)) {
+    return ($self->{_peeked} = $peeked);
+  }
+  return;
+}
+
+sub next {
+  my ($self) = @_;
+
+  # peeked entry so return that
+
+  if (exists $self->{_peeked}) {
+    if (my $peeked_from = delete $self->{_peeked_from}) {
+      $peeked_from->next;
+    }
+    return (delete $self->{_peeked});
+  }
+
+  $self->_next;
+}
+
+
+sub flatten {
+  my $self = shift;
+  require HTML::Zoom::FlattenedStream;
+  HTML::Zoom::FlattenedStream->new({
+    source => $self,
+    zconfig => $self->_zconfig
+  });
+}
+
+sub map {
+  my ($self, $mapper) = @_;
+  require HTML::Zoom::MappedStream;
+  HTML::Zoom::MappedStream->new({
+    source => $self, mapper => $mapper, zconfig => $self->_zconfig
+  });
+}
+
+sub with_filter {
+  my ($self, $selector, $filter) = @_;
+  my $match = $self->_parse_selector($selector);
+  $self->_zconfig->stream_utils->wrap_with_filter($self, $match, $filter);
+}
+
+sub with_transform {
+  my ($self, $transform) = @_;
+  $transform->apply_to_stream($self);
+}
+
+sub select {
+  my ($self, $selector) = @_;
+  return HTML::Zoom::TransformBuilder->new({
+    zconfig => $self->_zconfig,
+    selector => $selector,
+    filters => [],
+    proto => $self,
+  });
+}
+
+sub then {
+  my ($self) = @_;
+  # see notes in HTML/Zoom.pm for why this needs to be fixed
+  $self->select($self->transform->selector);
+}
+
+sub apply {
+  my ($self, $code) = @_;
+  local $_ = $self;
+  $self->$code;
+}
+
+sub apply_if {
+  my ($self, $predicate, $code) = @_;
+  if($predicate) {
+    local $_ = $self;
+    $self->$code;
+  }
+  else {
+    $self;
+  }
+}
+
+sub to_html {
+  my ($self) = @_;
+  $self->_zconfig->producer->html_from_stream($self);
+}
 
 1;