1 package HTML::Zoom::FilterBuilder;
6 use warnings FATAL => 'all';
7 use HTML::Zoom::CodeStream;
9 sub new { bless({}, shift) }
11 sub _stream_from_code {
12 HTML::Zoom::CodeStream->new({ code => $_[1] })
15 sub _stream_from_array {
17 HTML::Zoom::CodeStream->from_array(@_)
23 my $cur_stream = shift(@streams) or die "No streams passed";
24 HTML::Zoom::CodeStream->new({
26 return unless $cur_stream;
28 until (($evt) = $cur_stream->next) {
29 return unless $cur_stream = shift(@streams);
37 my ($self, $args) = @_;
38 my ($name, $value) = @{$args}{qw(name value)};
40 my $a = (my $evt = $_[0])->{attrs};
41 my $e = exists $a->{$name};
42 +{ %$evt, raw => undef, raw_attrs => undef,
43 attrs => { %$a, $name => $value },
44 ($e # add to name list if not present
46 : (attr_names => [ @{$evt->{attr_names}}, $name ]))
52 my ($self, $args) = @_;
53 my ($name, $value) = @{$args}{qw(name value)};
55 my $a = (my $evt = $_[0])->{attrs};
56 my $e = exists $a->{$name};
57 +{ %$evt, raw => undef, raw_attrs => undef,
60 $name => join(' ', ($e ? $a->{$name} : ()), $value)
62 ($e # add to name list if not present
64 : (attr_names => [ @{$evt->{attr_names}}, $name ]))
69 sub remove_attribute {
70 my ($self, $args) = @_;
71 my $name = $args->{name};
73 my $a = (my $evt = $_[0])->{attrs};
74 return $evt unless exists $a->{$name};
75 $a = { %$a }; delete $a->{$name};
76 +{ %$evt, raw => undef, raw_attrs => undef,
78 attr_names => [ grep $_ ne $name, @{$evt->{attr_names}} ]
84 my ($self, $options) = @_;
85 my ($into, $passthrough, $inside) = @{$options}{qw(into passthrough inside)};
87 my ($evt, $stream) = @_;
88 # We wipe the contents of @$into here so that other actions depending
89 # on this (such as a repeater) can be invoked multiple times easily.
90 # I -suspect- it's better for that state reset to be managed here; if it
91 # ever becomes painful the decision should be revisited
93 @$into = $inside ? () : ($evt);
95 if ($evt->{is_in_place_close}) {
96 return $evt if $passthrough || $inside;
99 my $name = $evt->{name};
101 my $_next = $inside ? 'peek' : 'next';
102 my $collector = $self->_stream_from_code(sub {
103 return unless $stream;
104 while (my ($evt) = $stream->$_next) {
105 $depth++ if ($evt->{type} eq 'OPEN');
106 $depth-- if ($evt->{type} eq 'CLOSE');
110 push(@$into, $evt) if $into;
111 return $evt if $passthrough;
114 push(@$into, $evt) if $into;
115 $stream->next if $inside;
116 return $evt if $passthrough;
118 die "Never saw closing </${name}> before end of source";
120 return ($passthrough||$inside) ? [ $evt, $collector ] : $collector;
125 my ($self, $events) = @_;
126 sub { return $self->_stream_from_array(@$events, $_[0]) };
130 my ($self, $events) = @_;
133 my $emit = $self->_stream_from_array(@$events);
134 my $coll = $self->collect({ passthrough => 1 })->(@_);
135 return ref($coll) eq 'HASH' # single event, no collect
137 : [ $coll->[0], $self->_stream_concat($coll->[1], $emit) ];
142 my ($self, $events) = @_;
145 if ($evt->{is_in_place_close}) {
146 $evt = { %$evt }; delete @{$evt}{qw(raw is_in_place_close)};
147 return [ $evt, $self->_stream_from_array(
148 @$events, { type => 'CLOSE', name => $evt->{name} }
151 return $self->_stream_from_array($evt, @$events);
156 my ($self, $events) = @_;
159 if ($evt->{is_in_place_close}) {
160 $evt = { %$evt }; delete @{$evt}{qw(raw is_in_place_close)};
161 return [ $evt, $self->_stream_from_array(
162 @$events, { type => 'CLOSE', name => $evt->{name} }
165 my $coll = $self->collect({ passthrough => 1, inside => 1 })->(@_);
166 my $emit = $self->_stream_from_array(@$events);
167 return [ $coll->[0], $self->_stream_concat($coll->[1], $emit) ];
172 my ($self, $events, $options) = @_;
174 my ($evt, $stream) = @_;
175 my $emit = $self->_stream_from_array(@$events);
176 my $coll = $self->collect($options)->(@_);
177 # For a straightforward replace operation we can, in fact, do the emit
178 # -before- the collect, and my first cut did so. However in order to
179 # use the captured content in generating the new content, we need
180 # the collect stage to happen first - and it seems highly unlikely
181 # that in normal operation the collect phase will take long enough
182 # for the difference to be noticeable
185 ? (ref $coll eq 'ARRAY'
186 ? [ $coll->[0], $self->_stream_concat($coll->[1], $emit) ]
187 : $self->_stream_concat($coll, $emit)