Commit | Line | Data |
456a815d |
1 | package HTML::Zoom::FilterBuilder; |
2 | |
3 | use Devel::Dwarn; |
4 | |
5 | use strict; |
6 | use warnings FATAL => 'all'; |
7 | use HTML::Zoom::CodeStream; |
8 | |
9 | sub new { bless({}, shift) } |
10 | |
11 | sub _stream_from_code { |
12 | HTML::Zoom::CodeStream->new({ code => $_[1] }) |
13 | } |
14 | |
15 | sub _stream_from_array { |
16 | shift; # lose $self |
17 | HTML::Zoom::CodeStream->from_array(@_) |
18 | } |
19 | |
20 | sub _stream_concat { |
21 | shift; # lose $self |
22 | my @streams = @_; |
23 | my $cur_stream = shift(@streams) or die "No streams passed"; |
24 | HTML::Zoom::CodeStream->new({ |
25 | code => sub { |
26 | return unless $cur_stream; |
27 | my $evt; |
28 | until (($evt) = $cur_stream->next) { |
29 | return unless $cur_stream = shift(@streams); |
30 | } |
31 | return $evt; |
32 | } |
33 | }); |
34 | } |
35 | |
36 | sub set_attribute { |
37 | my ($self, $args) = @_; |
38 | my ($name, $value) = @{$args}{qw(name value)}; |
39 | sub { |
40 | my $a = (my $evt = shift)->{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 |
45 | ? () |
46 | : (attr_names => [ @{$evt->{attr_names}}, $name ])) |
47 | } |
48 | }; |
49 | } |
50 | |
51 | sub add_attribute { |
52 | my ($self, $args) = @_; |
53 | my ($name, $value) = @{$args}{qw(name value)}; |
54 | sub { |
55 | my $a = (my $evt = shift)->{attrs}; |
56 | my $e = exists $a->{$name}; |
57 | +{ %$evt, raw => undef, raw_attrs => undef, |
58 | attrs => { |
59 | %$a, |
60 | $name => join(' ', ($e ? $a->{$name} : ()), $value) |
61 | }, |
62 | ($e # add to name list if not present |
63 | ? () |
64 | : (attr_names => [ @{$evt->{attr_names}}, $name ])) |
65 | } |
66 | }; |
67 | } |
68 | |
69 | sub remove_attribute { |
70 | my ($self, $args) = @_; |
71 | my $name = $args->{name}; |
72 | sub { |
73 | my $a = (my $evt = shift)->{attrs}; |
74 | return $evt unless exists $a->{$name}; |
75 | $a = { %$a }; delete $a->{$name}; |
76 | +{ %$evt, raw => undef, raw_attrs => undef, |
77 | attrs => $a, |
78 | attr_names => [ grep $_ ne $name, @{$evt->{attr_names}} ] |
79 | } |
80 | }; |
81 | } |
82 | |
83 | sub add_before { |
84 | my ($self, $events) = @_; |
85 | sub { return $self->_stream_from_array(@$events, shift) }; |
86 | } |
87 | |
88 | sub add_after { |
89 | my ($self, $events) = @_; |
90 | sub { |
91 | my ($evt, $stream) = @_; |
92 | my $emit = $self->_stream_from_array(@$events); |
93 | if ($evt->{is_in_place_close}) { |
94 | return [ $evt, $emit ]; |
95 | } |
96 | my ($filtered_evt, $coll) = @{$self->collect(undef, 1)->(@_)}; |
97 | return [ $filtered_evt, $self->_stream_concat($coll, $emit) ]; |
98 | }; |
99 | } |
100 | |
101 | sub prepend_inside { |
102 | my ($self, $events) = @_; |
103 | sub { |
104 | my $evt = shift; |
105 | if ($evt->{is_in_place_close}) { |
106 | $evt = { %$evt }; delete @{$evt}{qw(raw is_in_place_close)}; |
107 | return [ $evt, $self->_stream_from_array( |
108 | @$events, { type => 'CLOSE', name => $evt->{name} } |
109 | ) ]; |
110 | } |
111 | return $self->_stream_from_array($evt, @$events); |
112 | }; |
113 | } |
114 | |
115 | sub replace { |
116 | my ($self, $events) = @_; |
117 | sub { |
118 | my ($evt, $stream) = @_; |
119 | my $emit = $self->_stream_from_array(@$events); |
120 | if ($evt->{is_in_place_close}) { |
121 | return $emit |
122 | } |
123 | return $self->_stream_concat($emit, $self->collect->(@_)); |
124 | }; |
125 | } |
126 | |
127 | sub collect { |
128 | my ($self, $into, $passthrough) = @_; |
129 | sub { |
130 | my ($evt, $stream) = @_; |
131 | push(@$into, $evt) if $into; |
132 | if ($evt->{is_in_place_close}) { |
133 | return $evt if $passthrough; |
134 | return; |
135 | } |
136 | my $name = $evt->{name}; |
137 | my $depth = 1; |
138 | my $collector = $self->_stream_from_code(sub { |
139 | return unless $stream; |
140 | while (my ($evt) = $stream->next) { |
141 | $depth++ if ($evt->{type} eq 'OPEN'); |
142 | $depth-- if ($evt->{type} eq 'CLOSE'); |
143 | unless ($depth) { |
144 | undef $stream; |
145 | return $evt if $passthrough; |
146 | return; |
147 | } |
148 | push(@$into, $evt) if $into; |
149 | return $evt if $passthrough; |
150 | } |
151 | die "Never saw closing </${name}> before end of source"; |
152 | }); |
153 | return $passthrough ? [ $evt, $collector ] : $collector; |
154 | }; |
155 | } |
156 | |
157 | 1; |