1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
|
package TAP::Parser::YAMLish::Writer;
use strict;
use warnings;
use base 'TAP::Object';
our $VERSION = '3.42';
my $ESCAPE_CHAR = qr{ [ \x00-\x1f \" ] }x;
my $ESCAPE_KEY = qr{ (?: ^\W ) | $ESCAPE_CHAR }x;
my @UNPRINTABLE = qw(
z x01 x02 x03 x04 x05 x06 a
x08 t n v f r x0e x0f
x10 x11 x12 x13 x14 x15 x16 x17
x18 x19 x1a e x1c x1d x1e x1f
);
# new() implementation supplied by TAP::Object
sub write {
my $self = shift;
die "Need something to write"
unless @_;
my $obj = shift;
my $out = shift || \*STDOUT;
die "Need a reference to something I can write to"
unless ref $out;
$self->{writer} = $self->_make_writer($out);
$self->_write_obj( '---', $obj );
$self->_put('...');
delete $self->{writer};
}
sub _make_writer {
my $self = shift;
my $out = shift;
my $ref = ref $out;
if ( 'CODE' eq $ref ) {
return $out;
}
elsif ( 'ARRAY' eq $ref ) {
return sub { push @$out, shift };
}
elsif ( 'SCALAR' eq $ref ) {
return sub { $$out .= shift() . "\n" };
}
elsif ( 'GLOB' eq $ref || 'IO::Handle' eq $ref ) {
return sub { print $out shift(), "\n" };
}
die "Can't write to $out";
}
sub _put {
my $self = shift;
$self->{writer}->( join '', @_ );
}
sub _enc_scalar {
my $self = shift;
my $val = shift;
my $rule = shift;
return '~' unless defined $val;
if ( $val =~ /$rule/ ) {
$val =~ s/\\/\\\\/g;
$val =~ s/"/\\"/g;
$val =~ s/ ( [\x00-\x1f] ) / '\\' . $UNPRINTABLE[ ord($1) ] /gex;
return qq{"$val"};
}
if ( length($val) == 0 or $val =~ /\s/ ) {
$val =~ s/'/''/;
return "'$val'";
}
return $val;
}
sub _write_obj {
my $self = shift;
my $prefix = shift;
my $obj = shift;
my $indent = shift || 0;
if ( my $ref = ref $obj ) {
my $pad = ' ' x $indent;
if ( 'HASH' eq $ref ) {
if ( keys %$obj ) {
$self->_put($prefix);
for my $key ( sort keys %$obj ) {
my $value = $obj->{$key};
$self->_write_obj(
$pad . $self->_enc_scalar( $key, $ESCAPE_KEY ) . ':',
$value, $indent + 1
);
}
}
else {
$self->_put( $prefix, ' {}' );
}
}
elsif ( 'ARRAY' eq $ref ) {
if (@$obj) {
$self->_put($prefix);
for my $value (@$obj) {
$self->_write_obj(
$pad . '-', $value,
$indent + 1
);
}
}
else {
$self->_put( $prefix, ' []' );
}
}
else {
die "Don't know how to encode $ref";
}
}
else {
$self->_put( $prefix, ' ', $self->_enc_scalar( $obj, $ESCAPE_CHAR ) );
}
}
1;
__END__
=pod
=head1 NAME
TAP::Parser::YAMLish::Writer - Write YAMLish data
=head1 VERSION
Version 3.42
=head1 SYNOPSIS
use TAP::Parser::YAMLish::Writer;
my $data = {
one => 1,
two => 2,
three => [ 1, 2, 3 ],
};
my $yw = TAP::Parser::YAMLish::Writer->new;
# Write to an array...
$yw->write( $data, \@some_array );
# ...an open file handle...
$yw->write( $data, $some_file_handle );
# ...a string ...
$yw->write( $data, \$some_string );
# ...or a closure
$yw->write( $data, sub {
my $line = shift;
print "$line\n";
} );
=head1 DESCRIPTION
Encodes a scalar, hash reference or array reference as YAMLish.
=head1 METHODS
=head2 Class Methods
=head3 C<new>
my $writer = TAP::Parser::YAMLish::Writer->new;
The constructor C<new> creates and returns an empty
C<TAP::Parser::YAMLish::Writer> object.
=head2 Instance Methods
=head3 C<write>
$writer->write($obj, $output );
Encode a scalar, hash reference or array reference as YAML.
my $writer = sub {
my $line = shift;
print SOMEFILE "$line\n";
};
my $data = {
one => 1,
two => 2,
three => [ 1, 2, 3 ],
};
my $yw = TAP::Parser::YAMLish::Writer->new;
$yw->write( $data, $writer );
The C< $output > argument may be:
=over
=item * a reference to a scalar to append YAML to
=item * the handle of an open file
=item * a reference to an array into which YAML will be pushed
=item * a code reference
=back
If you supply a code reference the subroutine will be called once for
each line of output with the line as its only argument. Passed lines
will have no trailing newline.
=head1 AUTHOR
Andy Armstrong, <andy@hexten.net>
=head1 SEE ALSO
L<YAML::Tiny>, L<YAML>, L<YAML::Syck>, L<Config::Tiny>, L<CSS::Tiny>,
L<http://use.perl.org/~Alias/journal/29427>
=head1 COPYRIGHT
Copyright 2007-2011 Andy Armstrong.
This program is free software; you can redistribute
it and/or modify it under the same terms as Perl itself.
The full text of the license can be found in the
LICENSE file included with this module.
=cut
|
