/[webpac]/trunk2/lib/WebPAC.pm
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Annotation of /trunk2/lib/WebPAC.pm

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Revision 355 - (hide annotations)
Wed Jun 16 11:41:50 2004 UTC (15 years, 7 months ago) by dpavlin
File size: 6675 byte(s)
added create_lookup

1 dpavlin 354 package WebPAC;
2 dpavlin 352
3     use Carp;
4 dpavlin 353 use Text::Iconv;
5     use Config::IniFiles;
6 dpavlin 352
7     =head1 NAME
8    
9 dpavlin 354 WebPAC - base class for WebPAC
10 dpavlin 352
11     =head1 DESCRIPTION
12    
13 dpavlin 354 This module implements methods used by WebPAC.
14 dpavlin 352
15     =head1 METHODS
16    
17     =head2 new
18    
19 dpavlin 354 This will create new instance of WebPAC using configuration specified by C<config_file>.
20 dpavlin 352
21 dpavlin 354 my $webpac = new WebPAC(
22 dpavlin 352 config_file => 'name.conf',
23     [code_page => 'ISO-8859-2',]
24     );
25    
26     Default C<code_page> is C<ISO-8859-2>.
27    
28 dpavlin 353 It will also read configuration files
29     C<global.conf> (used by indexer and Web font-end)
30     and configuration file specified by C<config_file>
31     which describes databases to be indexed.
32    
33 dpavlin 352 =cut
34    
35     sub new {
36     my $class = shift;
37     my $self = {@_};
38     bless($self, $class);
39    
40     # fill in default values
41     # output codepage
42     $self->{'code_page'} = 'ISO-8859-2' if (! $self->{'code_page'});
43    
44 dpavlin 353 #
45     # read global.conf
46     #
47 dpavlin 352
48     $self->{global_config_file} = new Config::IniFiles( -file => 'global.conf' ) || croak "can't open 'global.conf'";
49    
50     # read global config parametars
51     foreach my $var (qw(
52     dbi_dbd
53     dbi_dsn
54     dbi_user
55     dbi_passwd
56     show_progress
57     my_unac_filter
58     )) {
59     $self->{global_config}->{$var} = $self->{global_config_file}->val('global', $var);
60     }
61    
62 dpavlin 353 #
63     # read indexer config file
64     #
65 dpavlin 352
66     $self->{indexer_config_file} = new Config::IniFiles( -file => $self->{config_file} ) || croak "can't open '$self->{config_file}'";
67    
68     # read global config parametars
69     foreach my $var (qw(
70     dbi_dbd
71     dbi_dsn
72     dbi_user
73     dbi_passwd
74     show_progress
75     my_unac_filter
76     )) {
77     $self->{global_config}->{$var} = $self->{global_config_file}->val('global', $var);
78     }
79    
80     return $self;
81     }
82    
83     =head2 open_isis
84    
85     Open CDS/ISIS database using OpenIsis module and read all records to memory.
86    
87     $webpac->open_isis(
88     filename => '/data/ISIS/ISIS',
89     code_page => '852',
90     limit_mfn => '500',
91     lookup => [ ... ],
92     );
93    
94     By default, ISIS code page is assumed to be C<852>.
95    
96 dpavlin 353 If optional parametar C<limit_mfn> is set, it will read just 500 records
97     from database in example above.
98 dpavlin 352
99     Returns number of last record read into memory (size of database, really).
100    
101     C<lookup> argument is an array of lookups to create. Each lookup must have C<key> and
102     C<val>. Optional parametar C<eval> is perl code to evaluate before storing
103     value in index.
104    
105     lookup => [
106     { 'key' => 'd:v900', 'val' => 'v250^a' },
107     { 'eval' => '"v901^a" eq "Podruèje"',
108     'key' => 'pa:v561^4:v562^4:v461^1',
109     'val' => 'v900' },
110     ]
111    
112     =cut
113    
114     sub open_isis {
115     my $self = shift;
116     my $arg = {@_};
117    
118     croak "need filename" if (! $arg->{'filename'});
119     my $code_page = $arg->{'code_page'} || '852';
120    
121 dpavlin 353 use OpenIsis;
122    
123 dpavlin 352 #$self->{'isis_code_page'} = $code_page;
124    
125     # create Text::Iconv object
126     my $cp = Text::Iconv->new($code_page,$self->{'code_page'});
127    
128     my $isis_db = OpenIsis::open($arg->{'filename'});
129    
130     my $maxmfn = OpenIsis::maxRowid( $isis_db ) || 1;
131    
132     # read database
133     for (my $mfn = 1; $mfn <= $maxmfn; $mfn++) {
134    
135     # read record
136     my $row = OpenIsis::read( $isis_db, $mfn );
137     foreach my $k (keys %{$row}) {
138     if ($k ne "mfn") {
139     foreach my $l (@{$row->{$k}}) {
140     $l = $cp->convert($l);
141     # has subfields?
142     my $val;
143     if ($l =~ m/\^/) {
144     foreach my $t (split(/\^/,$l)) {
145     next if (! $t);
146     $val->{substr($t,0,1)} = substr($t,1);
147     }
148     } else {
149     $val = $l;
150     }
151    
152     push @{$self->{'data'}->{$mfn}->{$k}}, $val;
153     }
154     }
155    
156     }
157    
158     # create lookup
159 dpavlin 355 my $rec = $self->{'data'}->{$mfn};
160     $self->create_lookup($rec, @{$arg->{'lookup'}});
161 dpavlin 352
162     }
163    
164     # store max mfn and return it.
165     return $self->{'max_mfn'} = $maxmfn;
166     }
167    
168 dpavlin 355 =head2 create_lookup
169    
170     Create lookup from record using lookup definition.
171    
172     =cut
173    
174     sub create_lookup {
175     my $self = shift;
176    
177     my $rec = shift || confess "need record to create lookup";
178     confess("need HASH as first argument!") if ($rec !~ /HASH/o);
179    
180     foreach my $i (@_) {
181     if ($i->{'eval'}) {
182     my $eval = $self->fill_in($rec,$i->{'eval'});
183     my $key = $self->fill_in($rec,$i->{'key'});
184     my @val = $self->fill_in($rec,$i->{'val'});
185     if ($key && @val && eval $eval) {
186     push @{$self->{'lookup'}->{$key}}, @val;
187     }
188     } else {
189     my $key = $self->fill_in($rec,$i->{'key'});
190     my @val = $self->fill_in($rec,$i->{'val'});
191     if ($key && @val) {
192     push @{$self->{'lookup'}->{$key}}, @val;
193     }
194     }
195     }
196     }
197    
198 dpavlin 352 =head2 fill_in
199    
200     Workhourse of all: takes record from in-memory structure of database and
201     strings with placeholders and returns string or array of with substituted
202     values from record.
203    
204     $webpac->fill_in($rec,'v250^a');
205    
206     Optional argument is ordinal number for repeatable fields. By default,
207 dpavlin 353 it's assume to be first repeatable field (fields are perl array, so first
208     element is 0).
209     Following example will read second value from repeatable field.
210 dpavlin 352
211 dpavlin 353 $webpac->fill_in($rec,'Title: v250^a',1);
212    
213     This function B<does not> perform parsing of format to inteligenty skip
214     delimiters before fields which aren't used.
215    
216 dpavlin 352 =cut
217    
218     sub fill_in {
219     my $self = shift;
220    
221     my $rec = shift || confess "need data record";
222     my $format = shift || confess "need format to parse";
223     # iteration (for repeatable fields)
224     my $i = shift || 0;
225    
226     # FIXME remove for speedup?
227 dpavlin 355 confess("need HASH as first argument!") if ($rec !~ /HASH/o);
228 dpavlin 352
229     my $found = 0;
230    
231     # get field with subfield
232     sub get_sf {
233     my ($found,$rec,$f,$sf,$i) = @_;
234     if ($$rec->{$f} && $$rec->{$f}->[$i]->{$sf}) {
235     $$found++;
236     return $$rec->{$f}->[$i]->{$sf};
237     } else {
238     return '';
239     }
240     }
241    
242     # get field (without subfield)
243     sub get_nosf {
244     my ($found,$rec,$f,$i) = @_;
245     if ($$rec->{$f} && $$rec->{$f}->[$i]) {
246     $$found++;
247     return $$rec->{$f}->[$i];
248     } else {
249     return '';
250     }
251     }
252    
253     # do actual replacement of placeholders
254     $format =~ s/v(\d+)\^(\w)/get_sf(\$found,\$rec,$1,$2,$i)/ges;
255     $format =~ s/v(\d+)/get_nosf(\$found,\$rec,$1,$i)/ges;
256    
257 dpavlin 353 if ($found) {
258     # do we have lookups?
259     if ($format =~ /\[[^\[\]]+\]/o) {
260     return $self->lookup($format);
261     } else {
262     return $format;
263     }
264 dpavlin 352 } else {
265     return;
266     }
267     }
268    
269     =head2 lookup
270    
271 dpavlin 355 Perform lookups on format supplied to it.
272 dpavlin 352
273     my $txt = $self->lookup('[v900]');
274    
275 dpavlin 355 Lookups can be nested (like C<[d:[a:[v900]]]>).
276    
277 dpavlin 352 =cut
278    
279     sub lookup {
280     my $self = shift;
281    
282     my $tmp = shift || confess "need format";
283    
284 dpavlin 353 if ($tmp =~ /\[[^\[\]]+\]/o) {
285 dpavlin 352 my @in = ( $tmp );
286 dpavlin 353 #print "##lookup $tmp\n";
287 dpavlin 352 my @out;
288     while (my $f = shift @in) {
289     if ($f =~ /\[([^\[\]]+)\]/) {
290     my $k = $1;
291     if ($self->{'lookup'}->{$k}) {
292 dpavlin 353 #print "## lookup key = $k\n";
293 dpavlin 352 foreach my $nv (@{$self->{'lookup'}->{$k}}) {
294     my $tmp2 = $f;
295     $tmp2 =~ s/\[$k\]/$nv/g;
296     push @in, $tmp2;
297 dpavlin 353 #print "## lookup in => $tmp2\n";
298 dpavlin 352 }
299     } else {
300     undef $f;
301     }
302     } elsif ($f) {
303     push @out, $f;
304 dpavlin 353 #print "## lookup out => $f\n";
305 dpavlin 352 }
306     }
307     return @out;
308     } else {
309     return $tmp;
310     }
311     }
312    
313     1;

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