package HTML::Zoom::FilterBuilder;
-use Devel::Dwarn;
-
use strict;
use warnings FATAL => 'all';
use HTML::Zoom::CodeStream;
HTML::Zoom::CodeStream->from_array(@_)
}
+sub _stream_from_proto {
+ my ($self, $proto) = @_;
+ my $ref = ref $proto;
+ if (not $ref) {
+ return $self->_stream_from_array({ type => 'TEXT', raw => $proto });
+ } elsif ($ref eq 'ARRAY') {
+ return $self->_stream_from_array(@$proto);
+ } elsif ($ref eq 'CODE') {
+ return $proto->();
+ } elsif ($ref eq 'SCALAR') {
+ require HTML::Zoom::Parser::BuiltIn;
+ return HTML::Zoom::Parser::BuiltIn->html_to_stream($$proto);
+ }
+ die "Don't know how to turn $proto (ref $ref) into a stream";
+}
+
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 $evt;
- }
- });
+ shift->_stream_from_array(@_)->flatten;
}
sub set_attribute {
my ($self, $args) = @_;
my ($name, $value) = @{$args}{qw(name value)};
sub {
- my $a = (my $evt = shift)->{attrs};
+ my $a = (my $evt = $_[0])->{attrs};
my $e = exists $a->{$name};
+{ %$evt, raw => undef, raw_attrs => undef,
attrs => { %$a, $name => $value },
my ($self, $args) = @_;
my ($name, $value) = @{$args}{qw(name value)};
sub {
- my $a = (my $evt = shift)->{attrs};
+ my $a = (my $evt = $_[0])->{attrs};
my $e = exists $a->{$name};
+{ %$evt, raw => undef, raw_attrs => undef,
attrs => {
my ($self, $args) = @_;
my $name = $args->{name};
sub {
- my $a = (my $evt = shift)->{attrs};
+ my $a = (my $evt = $_[0])->{attrs};
return $evt unless exists $a->{$name};
$a = { %$a }; delete $a->{$name};
+{ %$evt, raw => undef, raw_attrs => undef,
};
}
+sub collect {
+ my ($self, $options) = @_;
+ my ($into, $passthrough, $inside) = @{$options}{qw(into passthrough inside)};
+ sub {
+ my ($evt, $stream) = @_;
+ # We wipe the contents of @$into here so that other actions depending
+ # on this (such as a repeater) can be invoked multiple times easily.
+ # 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);
+ }
+ if ($evt->{is_in_place_close}) {
+ return $evt if $passthrough || $inside;
+ return;
+ }
+ my $name = $evt->{name};
+ my $depth = 1;
+ my $_next = $inside ? 'peek' : 'next';
+ my $collector = $self->_stream_from_code(sub {
+ return unless $stream;
+ while (my ($evt) = $stream->$_next) {
+ $depth++ if ($evt->{type} eq 'OPEN');
+ $depth-- if ($evt->{type} eq 'CLOSE');
+ unless ($depth) {
+ undef $stream;
+ return if $inside;
+ push(@$into, $evt) if $into;
+ return $evt if $passthrough;
+ return;
+ }
+ push(@$into, $evt) if $into;
+ $stream->next if $inside;
+ return $evt if $passthrough;
+ }
+ die "Never saw closing </${name}> before end of source";
+ });
+ return ($passthrough||$inside) ? [ $evt, $collector ] : $collector;
+ };
+}
+
sub add_before {
my ($self, $events) = @_;
- sub { return $self->_stream_from_array(@$events, shift) };
+ sub { return $self->_stream_from_array(@$events, $_[0]) };
}
sub add_after {
my ($self, $events) = @_;
+ my $coll_proto = $self->collect({ passthrough => 1 });
sub {
- my ($evt, $stream) = @_;
+ my ($evt) = @_;
my $emit = $self->_stream_from_array(@$events);
- my $coll = $self->collect(undef, { passthrough => 1 })->(@_);
+ my $coll = &$coll_proto;
return ref($coll) eq 'HASH' # single event, no collect
? [ $coll, $emit ]
: [ $coll->[0], $self->_stream_concat($coll->[1], $emit) ];
};
-}
+}
sub prepend_inside {
my ($self, $events) = @_;
sub {
- my $evt = shift;
+ my ($evt) = @_;
if ($evt->{is_in_place_close}) {
$evt = { %$evt }; delete @{$evt}{qw(raw is_in_place_close)};
return [ $evt, $self->_stream_from_array(
};
}
-sub replace {
+sub append_inside {
my ($self, $events) = @_;
+ my $coll_proto = $self->collect({ passthrough => 1, inside => 1 });
sub {
- my ($evt, $stream) = @_;
+ my ($evt) = @_;
+ if ($evt->{is_in_place_close}) {
+ $evt = { %$evt }; delete @{$evt}{qw(raw is_in_place_close)};
+ return [ $evt, $self->_stream_from_array(
+ @$events, { type => 'CLOSE', name => $evt->{name} }
+ ) ];
+ }
+ my $coll = &$coll_proto;
my $emit = $self->_stream_from_array(@$events);
- my $coll = $self->collect->(@_);
- return $coll ? $self->_stream_concat($emit, $coll) : $emit;
+ return [ $coll->[0], $self->_stream_concat($coll->[1], $emit) ];
};
}
-sub collect {
- my ($self, $into, $attrs) = @_;
- my ($passthrough) = @{$attrs}{qw(passthrough)};
+sub replace {
+ my ($self, $replace_with, $options) = @_;
+ my $coll_proto = $self->collect($options);
sub {
my ($evt, $stream) = @_;
- push(@$into, $evt) if $into;
- if ($evt->{is_in_place_close}) {
- return $evt if $passthrough;
- return;
- }
- my $name = $evt->{name};
- my $depth = 1;
- my $collector = $self->_stream_from_code(sub {
- return unless $stream;
- while (my ($evt) = $stream->next) {
- $depth++ if ($evt->{type} eq 'OPEN');
- $depth-- if ($evt->{type} eq 'CLOSE');
- unless ($depth) {
- undef $stream;
- return $evt if $passthrough;
- return;
- }
- push(@$into, $evt) if $into;
- return $evt if $passthrough;
- }
- die "Never saw closing </${name}> before end of source";
- });
- return $passthrough ? [ $evt, $collector ] : $collector;
+ 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
+ # use the captured content in generating the new content, we need
+ # the collect stage to happen first - and it seems highly unlikely
+ # that in normal operation the collect phase will take long enough
+ # for the difference to be noticeable
+ return
+ ($coll
+ ? (ref $coll eq 'ARRAY'
+ ? [ $coll->[0], $self->_stream_concat($coll->[1], $emit) ]
+ : $self->_stream_concat($coll, $emit)
+ )
+ : $emit
+ );
+ };
+}
+
+sub repeat {
+ my ($self, $repeat_for, $options) = @_;
+ $options->{into} = \my @into;
+ my $map_repeat = sub {
+ local $_ = $self->_stream_from_array(@into);
+ $_[0]->($_)
+ };
+ my $repeater = sub {
+ $self->_stream_from_proto($repeat_for)
+ ->map($map_repeat)
+ ->flatten
};
+ $self->replace($repeater, $options);
}
1;