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 { |
8f962884 |
40 | my $a = (my $evt = $_[0])->{attrs}; |
456a815d |
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 { |
8f962884 |
55 | my $a = (my $evt = $_[0])->{attrs}; |
456a815d |
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 { |
8f962884 |
73 | my $a = (my $evt = $_[0])->{attrs}; |
456a815d |
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) = @_; |
8f962884 |
85 | sub { return $self->_stream_from_array(@$events, $_[0]) }; |
456a815d |
86 | } |
87 | |
88 | sub add_after { |
89 | my ($self, $events) = @_; |
90 | sub { |
8f962884 |
91 | my ($evt) = @_; |
456a815d |
92 | my $emit = $self->_stream_from_array(@$events); |
cac9d0a5 |
93 | my $coll = $self->collect({ passthrough => 1 })->(@_); |
995bc8be |
94 | return ref($coll) eq 'HASH' # single event, no collect |
95 | ? [ $coll, $emit ] |
96 | : [ $coll->[0], $self->_stream_concat($coll->[1], $emit) ]; |
456a815d |
97 | }; |
8f962884 |
98 | } |
456a815d |
99 | |
100 | sub prepend_inside { |
101 | my ($self, $events) = @_; |
102 | sub { |
8f962884 |
103 | my ($evt) = @_; |
456a815d |
104 | if ($evt->{is_in_place_close}) { |
105 | $evt = { %$evt }; delete @{$evt}{qw(raw is_in_place_close)}; |
106 | return [ $evt, $self->_stream_from_array( |
107 | @$events, { type => 'CLOSE', name => $evt->{name} } |
108 | ) ]; |
109 | } |
110 | return $self->_stream_from_array($evt, @$events); |
111 | }; |
112 | } |
113 | |
8f962884 |
114 | sub append_inside { |
115 | my ($self, $events) = @_; |
116 | sub { |
117 | my ($evt) = @_; |
118 | if ($evt->{is_in_place_close}) { |
119 | $evt = { %$evt }; delete @{$evt}{qw(raw is_in_place_close)}; |
120 | return [ $evt, $self->_stream_from_array( |
121 | @$events, { type => 'CLOSE', name => $evt->{name} } |
122 | ) ]; |
123 | } |
124 | my $coll = $self->collect({ passthrough => 1, inside => 1 })->(@_); |
125 | my $emit = $self->_stream_from_array(@$events); |
126 | return [ $coll->[0], $self->_stream_concat($coll->[1], $emit) ]; |
127 | }; |
128 | } |
129 | |
456a815d |
130 | sub replace { |
131 | my ($self, $events) = @_; |
132 | sub { |
133 | my ($evt, $stream) = @_; |
134 | my $emit = $self->_stream_from_array(@$events); |
995bc8be |
135 | my $coll = $self->collect->(@_); |
136 | return $coll ? $self->_stream_concat($emit, $coll) : $emit; |
456a815d |
137 | }; |
138 | } |
139 | |
140 | sub collect { |
cac9d0a5 |
141 | my ($self, $attrs) = @_; |
8f962884 |
142 | my ($into, $passthrough, $inside) = @{$attrs}{qw(into passthrough inside)}; |
456a815d |
143 | sub { |
144 | my ($evt, $stream) = @_; |
8f962884 |
145 | push(@$into, $evt) if $into && !$inside; |
456a815d |
146 | if ($evt->{is_in_place_close}) { |
8f962884 |
147 | return $evt if $passthrough || $inside; |
456a815d |
148 | return; |
149 | } |
150 | my $name = $evt->{name}; |
151 | my $depth = 1; |
8f962884 |
152 | my $_next = $inside ? 'peek' : 'next'; |
456a815d |
153 | my $collector = $self->_stream_from_code(sub { |
154 | return unless $stream; |
8f962884 |
155 | while (my ($evt) = $stream->$_next) { |
456a815d |
156 | $depth++ if ($evt->{type} eq 'OPEN'); |
157 | $depth-- if ($evt->{type} eq 'CLOSE'); |
158 | unless ($depth) { |
159 | undef $stream; |
8f962884 |
160 | return if $inside; |
161 | push(@$into, $evt) if $into; |
456a815d |
162 | return $evt if $passthrough; |
163 | return; |
164 | } |
8f962884 |
165 | push(@$into, $evt) if $into; |
166 | $stream->next if $inside; |
456a815d |
167 | return $evt if $passthrough; |
168 | } |
169 | die "Never saw closing </${name}> before end of source"; |
170 | }); |
8f962884 |
171 | return ($passthrough||$inside) ? [ $evt, $collector ] : $collector; |
456a815d |
172 | }; |
173 | } |
174 | |
175 | 1; |