Commit | Line | Data |
456a815d |
1 | package HTML::Zoom::FilterBuilder; |
2 | |
456a815d |
3 | use strict; |
4 | use warnings FATAL => 'all'; |
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5 | use base qw(HTML::Zoom::SubObject); |
456a815d |
6 | use HTML::Zoom::CodeStream; |
7 | |
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8 | sub _stream_from_code { |
d80786d0 |
9 | shift->_zconfig->stream_utils->stream_from_code(@_) |
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10 | } |
11 | |
12 | sub _stream_from_array { |
d80786d0 |
13 | shift->_zconfig->stream_utils->stream_from_array(@_) |
456a815d |
14 | } |
15 | |
3cdbc13f |
16 | sub _stream_from_proto { |
d80786d0 |
17 | shift->_zconfig->stream_utils->stream_from_proto(@_) |
3cdbc13f |
18 | } |
19 | |
456a815d |
20 | sub _stream_concat { |
d80786d0 |
21 | shift->_zconfig->stream_utils->stream_concat(@_) |
456a815d |
22 | } |
23 | |
24 | sub set_attribute { |
25 | my ($self, $args) = @_; |
26 | my ($name, $value) = @{$args}{qw(name value)}; |
27 | sub { |
8f962884 |
28 | my $a = (my $evt = $_[0])->{attrs}; |
456a815d |
29 | my $e = exists $a->{$name}; |
30 | +{ %$evt, raw => undef, raw_attrs => undef, |
31 | attrs => { %$a, $name => $value }, |
32 | ($e # add to name list if not present |
33 | ? () |
34 | : (attr_names => [ @{$evt->{attr_names}}, $name ])) |
35 | } |
36 | }; |
37 | } |
38 | |
39 | sub add_attribute { |
40 | my ($self, $args) = @_; |
41 | my ($name, $value) = @{$args}{qw(name value)}; |
42 | sub { |
8f962884 |
43 | my $a = (my $evt = $_[0])->{attrs}; |
456a815d |
44 | my $e = exists $a->{$name}; |
45 | +{ %$evt, raw => undef, raw_attrs => undef, |
46 | attrs => { |
47 | %$a, |
48 | $name => join(' ', ($e ? $a->{$name} : ()), $value) |
49 | }, |
50 | ($e # add to name list if not present |
51 | ? () |
52 | : (attr_names => [ @{$evt->{attr_names}}, $name ])) |
53 | } |
54 | }; |
55 | } |
56 | |
57 | sub remove_attribute { |
58 | my ($self, $args) = @_; |
59 | my $name = $args->{name}; |
60 | sub { |
8f962884 |
61 | my $a = (my $evt = $_[0])->{attrs}; |
456a815d |
62 | return $evt unless exists $a->{$name}; |
63 | $a = { %$a }; delete $a->{$name}; |
64 | +{ %$evt, raw => undef, raw_attrs => undef, |
65 | attrs => $a, |
66 | attr_names => [ grep $_ ne $name, @{$evt->{attr_names}} ] |
67 | } |
68 | }; |
69 | } |
70 | |
76cecb10 |
71 | sub collect { |
72 | my ($self, $options) = @_; |
dae33531 |
73 | my ($into, $passthrough, $content, $filter) = |
74 | @{$options}{qw(into passthrough content filter)}; |
76cecb10 |
75 | sub { |
76 | my ($evt, $stream) = @_; |
b4d044eb |
77 | # We wipe the contents of @$into here so that other actions depending |
78 | # on this (such as a repeater) can be invoked multiple times easily. |
79 | # I -suspect- it's better for that state reset to be managed here; if it |
80 | # ever becomes painful the decision should be revisited |
81 | if ($into) { |
865bb5d2 |
82 | @$into = $content ? () : ($evt); |
b4d044eb |
83 | } |
76cecb10 |
84 | if ($evt->{is_in_place_close}) { |
865bb5d2 |
85 | return $evt if $passthrough || $content; |
76cecb10 |
86 | return; |
87 | } |
88 | my $name = $evt->{name}; |
89 | my $depth = 1; |
865bb5d2 |
90 | my $_next = $content ? 'peek' : 'next'; |
d80786d0 |
91 | $stream = do { local $_ = $stream; $filter->($stream) } if $filter; |
76cecb10 |
92 | my $collector = $self->_stream_from_code(sub { |
93 | return unless $stream; |
94 | while (my ($evt) = $stream->$_next) { |
95 | $depth++ if ($evt->{type} eq 'OPEN'); |
96 | $depth-- if ($evt->{type} eq 'CLOSE'); |
97 | unless ($depth) { |
98 | undef $stream; |
865bb5d2 |
99 | return if $content; |
76cecb10 |
100 | push(@$into, $evt) if $into; |
101 | return $evt if $passthrough; |
102 | return; |
103 | } |
104 | push(@$into, $evt) if $into; |
865bb5d2 |
105 | $stream->next if $content; |
76cecb10 |
106 | return $evt if $passthrough; |
107 | } |
108 | die "Never saw closing </${name}> before end of source"; |
109 | }); |
865bb5d2 |
110 | return ($passthrough||$content) ? [ $evt, $collector ] : $collector; |
76cecb10 |
111 | }; |
112 | } |
113 | |
865bb5d2 |
114 | sub collect_content { |
115 | my ($self, $options) = @_; |
116 | $self->collect({ %{$options||{}}, content => 1 }) |
117 | } |
118 | |
456a815d |
119 | sub add_before { |
120 | my ($self, $events) = @_; |
8f962884 |
121 | sub { return $self->_stream_from_array(@$events, $_[0]) }; |
456a815d |
122 | } |
123 | |
124 | sub add_after { |
125 | my ($self, $events) = @_; |
b616863d |
126 | my $coll_proto = $self->collect({ passthrough => 1 }); |
456a815d |
127 | sub { |
8f962884 |
128 | my ($evt) = @_; |
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129 | my $emit = $self->_stream_from_array(@$events); |
b616863d |
130 | my $coll = &$coll_proto; |
995bc8be |
131 | return ref($coll) eq 'HASH' # single event, no collect |
132 | ? [ $coll, $emit ] |
133 | : [ $coll->[0], $self->_stream_concat($coll->[1], $emit) ]; |
456a815d |
134 | }; |
8f962884 |
135 | } |
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136 | |
865bb5d2 |
137 | sub prepend_content { |
456a815d |
138 | my ($self, $events) = @_; |
139 | sub { |
8f962884 |
140 | my ($evt) = @_; |
456a815d |
141 | if ($evt->{is_in_place_close}) { |
142 | $evt = { %$evt }; delete @{$evt}{qw(raw is_in_place_close)}; |
143 | return [ $evt, $self->_stream_from_array( |
144 | @$events, { type => 'CLOSE', name => $evt->{name} } |
145 | ) ]; |
146 | } |
147 | return $self->_stream_from_array($evt, @$events); |
148 | }; |
149 | } |
150 | |
865bb5d2 |
151 | sub append_content { |
8f962884 |
152 | my ($self, $events) = @_; |
865bb5d2 |
153 | my $coll_proto = $self->collect({ passthrough => 1, content => 1 }); |
8f962884 |
154 | sub { |
155 | my ($evt) = @_; |
156 | if ($evt->{is_in_place_close}) { |
157 | $evt = { %$evt }; delete @{$evt}{qw(raw is_in_place_close)}; |
158 | return [ $evt, $self->_stream_from_array( |
159 | @$events, { type => 'CLOSE', name => $evt->{name} } |
160 | ) ]; |
161 | } |
b616863d |
162 | my $coll = &$coll_proto; |
8f962884 |
163 | my $emit = $self->_stream_from_array(@$events); |
164 | return [ $coll->[0], $self->_stream_concat($coll->[1], $emit) ]; |
165 | }; |
166 | } |
167 | |
456a815d |
168 | sub replace { |
3cdbc13f |
169 | my ($self, $replace_with, $options) = @_; |
b616863d |
170 | my $coll_proto = $self->collect($options); |
456a815d |
171 | sub { |
172 | my ($evt, $stream) = @_; |
3cdbc13f |
173 | my $emit = $self->_stream_from_proto($replace_with); |
b616863d |
174 | my $coll = &$coll_proto; |
451b3b30 |
175 | # For a straightforward replace operation we can, in fact, do the emit |
176 | # -before- the collect, and my first cut did so. However in order to |
177 | # use the captured content in generating the new content, we need |
178 | # the collect stage to happen first - and it seems highly unlikely |
179 | # that in normal operation the collect phase will take long enough |
180 | # for the difference to be noticeable |
11cc25dd |
181 | return |
182 | ($coll |
183 | ? (ref $coll eq 'ARRAY' |
451b3b30 |
184 | ? [ $coll->[0], $self->_stream_concat($coll->[1], $emit) ] |
185 | : $self->_stream_concat($coll, $emit) |
11cc25dd |
186 | ) |
187 | : $emit |
188 | ); |
456a815d |
189 | }; |
190 | } |
191 | |
865bb5d2 |
192 | sub replace_content { |
193 | my ($self, $replace_with, $options) = @_; |
194 | $self->replace($replace_with, { %{$options||{}}, content => 1 }) |
195 | } |
196 | |
3cdbc13f |
197 | sub repeat { |
198 | my ($self, $repeat_for, $options) = @_; |
199 | $options->{into} = \my @into; |
f8ed299b |
200 | my @between; |
201 | my $repeat_between = delete $options->{repeat_between}; |
202 | if ($repeat_between) { |
f8ed299b |
203 | $options->{filter} = sub { |
d80786d0 |
204 | $_->select($repeat_between)->collect({ into => \@between }) |
f8ed299b |
205 | }; |
206 | } |
3cdbc13f |
207 | my $repeater = sub { |
f8ed299b |
208 | my $s = $self->_stream_from_proto($repeat_for); |
209 | # We have to test $repeat_between not @between here because |
210 | # at the point we're constructing our return stream @between |
211 | # hasn't been populated yet - but we can test @between in the |
212 | # map routine because it has been by then and that saves us doing |
213 | # the extra stream construction if we don't need it. |
214 | if ($repeat_between) { |
215 | $s->map(sub { |
216 | local $_ = $self->_stream_from_array(@into); |
217 | (@between && $s->peek) |
218 | ? $self->_stream_concat( |
219 | $_[0]->($_), $self->_stream_from_array(@between) |
220 | ) |
221 | : $_[0]->($_) |
222 | }) |
223 | ->flatten; |
224 | } else { |
225 | $s->map(sub { |
226 | local $_ = $self->_stream_from_array(@into); |
227 | $_[0]->($_) |
228 | }) |
229 | ->flatten; |
230 | } |
3cdbc13f |
231 | }; |
232 | $self->replace($repeater, $options); |
233 | } |
234 | |
865bb5d2 |
235 | sub repeat_content { |
236 | my ($self, $repeat_for, $options) = @_; |
237 | $self->repeat($repeat_for, { %{$options||{}}, content => 1 }) |
238 | } |
239 | |
456a815d |
240 | 1; |