1 |
package WebPAC::Common; |
2 |
|
3 |
use warnings; |
4 |
use strict; |
5 |
|
6 |
use Log::Log4perl qw(get_logger :levels); |
7 |
|
8 |
=head1 NAME |
9 |
|
10 |
WebPAC::Common - internal methods called from other WebPAC modules |
11 |
|
12 |
=head1 VERSION |
13 |
|
14 |
Version 0.01 |
15 |
|
16 |
=cut |
17 |
|
18 |
our $VERSION = '0.01'; |
19 |
|
20 |
#my $LOOKUP_REGEX = '\[[^\[\]]+\]'; |
21 |
#my $LOOKUP_REGEX_SAVE = '\[([^\[\]]+)\]'; |
22 |
my $LOOKUP_REGEX = 'lookup{[^\{\}]+}'; |
23 |
my $LOOKUP_REGEX_SAVE = 'lookup{([^\{\}]+)}'; |
24 |
|
25 |
=head1 SYNOPSYS |
26 |
|
27 |
This module defines common functions, and is used as base for other, more |
28 |
specific modules. |
29 |
|
30 |
my $webpac = new WebPAC::Common( |
31 |
filter => { |
32 |
'filter_name_1' => sub { |
33 |
# filter code |
34 |
return length($_); |
35 |
}, ... |
36 |
}, |
37 |
} |
38 |
|
39 |
=head1 FUNCTIONS |
40 |
|
41 |
=head2 fill_in |
42 |
|
43 |
Workhourse of all: takes record from in-memory structure of database and |
44 |
strings with placeholders and returns string or array of with substituted |
45 |
values from record. |
46 |
|
47 |
my $text = $webpac->fill_in($rec,'v250^a'); |
48 |
|
49 |
Optional argument is ordinal number for repeatable fields. By default, |
50 |
it's assume to be first repeatable field (fields are perl array, so first |
51 |
element is 0). |
52 |
Following example will read second value from repeatable field. |
53 |
|
54 |
my $text = $webpac->fill_in($rec,'Title: v250^a',1); |
55 |
|
56 |
This function B<does not> perform parsing of format to inteligenty skip |
57 |
delimiters before fields which aren't used. |
58 |
|
59 |
This method will automatically decode UTF-8 string to local code page |
60 |
if needed. |
61 |
|
62 |
=cut |
63 |
|
64 |
sub fill_in { |
65 |
my $self = shift; |
66 |
|
67 |
my $log = $self->_get_logger(); |
68 |
|
69 |
my $rec = shift || $log->logconfess("need data record"); |
70 |
my $format = shift || $log->logconfess("need format to parse"); |
71 |
# iteration (for repeatable fields) |
72 |
my $i = shift || 0; |
73 |
|
74 |
$log->logdie("infitite loop in format $format") if ($i > ($self->{'max_mfn'} || 9999)); |
75 |
|
76 |
# FIXME remove for speedup? |
77 |
$log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o); |
78 |
|
79 |
if (utf8::is_utf8($format)) { |
80 |
$format = $self->_x($format); |
81 |
} |
82 |
|
83 |
my $found = 0; |
84 |
|
85 |
my $eval_code; |
86 |
# remove eval{...} from beginning |
87 |
$eval_code = $1 if ($format =~ s/^eval{([^}]+)}//s); |
88 |
|
89 |
my $filter_name; |
90 |
# remove filter{...} from beginning |
91 |
$filter_name = $1 if ($format =~ s/^filter{([^}]+)}//s); |
92 |
|
93 |
# do actual replacement of placeholders |
94 |
# repeatable fields |
95 |
$format =~ s/v(\d+)(?:\^(\w))?/$self->get_data(\$rec,$1,$2,$i,\$found)/ges; |
96 |
# non-repeatable fields |
97 |
$format =~ s/s(\d+)(?:\^(\w))?/$self->get_data(\$rec,$1,$2,0,\$found)/ges; |
98 |
|
99 |
if ($found) { |
100 |
$log->debug("format: $format"); |
101 |
if ($eval_code) { |
102 |
my $eval = $self->fill_in($rec,$eval_code,$i); |
103 |
return if (! $self->_eval($eval)); |
104 |
} |
105 |
if ($filter_name && $self->{'filter'}->{$filter_name}) { |
106 |
$log->debug("filter '$filter_name' for $format"); |
107 |
$format = $self->{'filter'}->{$filter_name}->($format); |
108 |
return unless(defined($format)); |
109 |
$log->debug("filter result: $format"); |
110 |
} |
111 |
# do we have lookups? |
112 |
if ($format =~ /$LOOKUP_REGEX/o) { |
113 |
$log->debug("format '$format' has lookup"); |
114 |
return $self->lookup($format); |
115 |
} else { |
116 |
return $format; |
117 |
} |
118 |
} else { |
119 |
return; |
120 |
} |
121 |
} |
122 |
|
123 |
|
124 |
=head2 get_data |
125 |
|
126 |
Returns value from record. |
127 |
|
128 |
my $text = $self->get_data(\$rec,$f,$sf,$i,\$found); |
129 |
|
130 |
Arguments are: |
131 |
record reference C<$rec>, |
132 |
field C<$f>, |
133 |
optional subfiled C<$sf>, |
134 |
index for repeatable values C<$i>. |
135 |
|
136 |
Optinal variable C<$found> will be incremeted if there |
137 |
is field. |
138 |
|
139 |
Returns value or empty string. |
140 |
|
141 |
=cut |
142 |
|
143 |
sub get_data { |
144 |
my $self = shift; |
145 |
|
146 |
my ($rec,$f,$sf,$i,$found) = @_; |
147 |
|
148 |
if ($$rec->{$f}) { |
149 |
return '' if (! $$rec->{$f}->[$i]); |
150 |
no strict 'refs'; |
151 |
if ($sf && $$rec->{$f}->[$i]->{$sf}) { |
152 |
$$found++ if (defined($$found)); |
153 |
return $$rec->{$f}->[$i]->{$sf}; |
154 |
} elsif ($$rec->{$f}->[$i]) { |
155 |
$$found++ if (defined($$found)); |
156 |
# it still might have subfield, just |
157 |
# not specified, so we'll dump all |
158 |
if ($$rec->{$f}->[$i] =~ /HASH/o) { |
159 |
my $out; |
160 |
foreach my $k (keys %{$$rec->{$f}->[$i]}) { |
161 |
$out .= $$rec->{$f}->[$i]->{$k}." "; |
162 |
} |
163 |
return $out; |
164 |
} else { |
165 |
return $$rec->{$f}->[$i]; |
166 |
} |
167 |
} |
168 |
} else { |
169 |
return ''; |
170 |
} |
171 |
} |
172 |
|
173 |
|
174 |
=head1 INTERNAL METHODS |
175 |
|
176 |
Here is a quick list of internal methods, mostly useful to turn debugging |
177 |
on them (see L<LOGGING> below for explanation). |
178 |
|
179 |
=cut |
180 |
|
181 |
=head2 _eval |
182 |
|
183 |
Internal function to eval code without C<strict 'subs'>. |
184 |
|
185 |
=cut |
186 |
|
187 |
sub _eval { |
188 |
my $self = shift; |
189 |
|
190 |
my $code = shift || return; |
191 |
|
192 |
my $log = $self->_get_logger(); |
193 |
|
194 |
no strict 'subs'; |
195 |
my $ret = eval $code; |
196 |
if ($@) { |
197 |
$log->error("problem with eval code [$code]: $@"); |
198 |
} |
199 |
|
200 |
$log->debug("eval: ",$code," [",$ret,"]"); |
201 |
|
202 |
return $ret || undef; |
203 |
} |
204 |
|
205 |
=head2 _sort_by_order |
206 |
|
207 |
Sort xml tags data structure accoding to C<order=""> attribute. |
208 |
|
209 |
=cut |
210 |
|
211 |
sub _sort_by_order { |
212 |
my $self = shift; |
213 |
|
214 |
my $va = $self->{'import_xml'}->{'indexer'}->{$a}->{'order'} || |
215 |
$self->{'import_xml'}->{'indexer'}->{$a}; |
216 |
my $vb = $self->{'import_xml'}->{'indexer'}->{$b}->{'order'} || |
217 |
$self->{'import_xml'}->{'indexer'}->{$b}; |
218 |
|
219 |
return $va <=> $vb; |
220 |
} |
221 |
|
222 |
=head2 _x |
223 |
|
224 |
Convert string from UTF-8 to code page defined in C<import_xml>. |
225 |
|
226 |
my $text = $webpac->_x('utf8 text'); |
227 |
|
228 |
Default application code page is C<ISO-8859-2>. You will probably want to |
229 |
change that when creating new instance of object based on this one. |
230 |
|
231 |
=cut |
232 |
|
233 |
sub _x { |
234 |
my $self = shift; |
235 |
my $utf8 = shift || return; |
236 |
|
237 |
# create UTF-8 convertor for import_xml files |
238 |
$self->{'utf2cp'} ||= Text::Iconv->new('UTF-8' ,$self->{'code_page'} || 'ISO-8859-2'); |
239 |
|
240 |
return $self->{'utf2cp'}->convert($utf8) || |
241 |
$self->_get_logger()->logwarn("can't convert '$utf8'"); |
242 |
} |
243 |
|
244 |
=head2 _init_logger |
245 |
|
246 |
This function will init C<Log::Log4perl> using provided configuration file. |
247 |
|
248 |
$webpac->_init_logger('/path/to/log.conf'); |
249 |
|
250 |
If no path to configuration file is given, dummy empty configuration |
251 |
will be create. |
252 |
|
253 |
=cut |
254 |
|
255 |
sub _init_logger { |
256 |
my $self = shift; |
257 |
my $file = shift; |
258 |
if ($file) { |
259 |
Log::Log4perl->init($file); |
260 |
} else { |
261 |
my $conf = q( ); |
262 |
Log::Log4perl->init( \$conf ); |
263 |
} |
264 |
} |
265 |
|
266 |
|
267 |
=head2 _get_logger |
268 |
|
269 |
Get C<Log::Log4perl> object with a twist: domains are defined for each |
270 |
method |
271 |
|
272 |
my $log = $webpac->_get_logger(); |
273 |
|
274 |
=cut |
275 |
|
276 |
sub _get_logger { |
277 |
my $self = shift; |
278 |
|
279 |
$self->{'_logger_ok'} ||= $self->_init_logger; |
280 |
|
281 |
my $name = (caller(1))[3] || caller; |
282 |
return get_logger($name); |
283 |
} |
284 |
|
285 |
|
286 |
=head1 LOGGING |
287 |
|
288 |
Logging in WebPAC is performed by L<Log::Log4perl> with config file |
289 |
C<log.conf>. |
290 |
|
291 |
Methods defined above have different levels of logging, so |
292 |
it's descriptions will be useful to turn (mostry B<debug> logging) on |
293 |
or off to see why WabPAC isn't perforing as you expect it (it might even |
294 |
be a bug!). |
295 |
|
296 |
B<This is different from normal Log4perl behaviour>. To repeat, you can |
297 |
also use method names, and not only classes (which are just few) |
298 |
to filter logging. |
299 |
|
300 |
|