/[webpac2]/trunk/lib/WebPAC/Common.pm
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revision 10 by dpavlin, Sat Jul 16 20:35:30 2005 UTC revision 254 by dpavlin, Fri Dec 16 01:04:14 2005 UTC
# Line 3  package WebPAC::Common; Line 3  package WebPAC::Common;
3  use warnings;  use warnings;
4  use strict;  use strict;
5    
6  use Log::Log4perl qw(get_logger :levels);  use Log::Log4perl qw/get_logger :levels/;
7    use Time::HiRes qw/time/;
8    
9    # If ture, enable logging debug
10    my $log_debug = 0;
11    
12  =head1 NAME  =head1 NAME
13    
# Line 11  WebPAC::Common - internal methods called Line 15  WebPAC::Common - internal methods called
15    
16  =head1 VERSION  =head1 VERSION
17    
18  Version 0.01  Version 0.02
19    
20  =cut  =cut
21    
22  our $VERSION = '0.01';  our $VERSION = '0.02';
23    
24  =head1 SYNOPSYS  =head1 SYNOPSYS
25    
26  This module defines common functions, and is used as base for other, more  This module defines common functions, and is used as base for other, more
27  specific modules.  specific modules.
28    
  my $webpac = new WebPAC::Common(  
         filter => {  
                 'filter_name_1' => sub {  
                         # filter code  
                         return length($_);  
                 }, ...  
         },  
   }  
   
29  =head1 FUNCTIONS  =head1 FUNCTIONS
30    
 =head2 fill_in  
   
 Workhourse of all: takes record from in-memory structure of database and  
 strings with placeholders and returns string or array of with substituted  
 values from record.  
   
  my $text = $webpac->fill_in($rec,'v250^a');  
   
 Optional argument is ordinal number for repeatable fields. By default,  
 it's assume to be first repeatable field (fields are perl array, so first  
 element is 0).  
 Following example will read second value from repeatable field.  
   
  my $text = $webpac->fill_in($rec,'Title: v250^a',1);  
   
 This function B<does not> perform parsing of format to inteligenty skip  
 delimiters before fields which aren't used.  
   
 This method will automatically decode UTF-8 string to local code page  
 if needed.  
   
 =cut  
   
 sub fill_in {  
         my $self = shift;  
   
         my $log = $self->_get_logger();  
   
         my $rec = shift || $log->logconfess("need data record");  
         my $format = shift || $log->logconfess("need format to parse");  
         # iteration (for repeatable fields)  
         my $i = shift || 0;  
   
         $log->logdie("infitite loop in format $format") if ($i > ($self->{'max_mfn'} || 9999));  
   
         # FIXME remove for speedup?  
         $log->logconfess("need HASH as first argument!") if ($rec !~ /HASH/o);  
   
         if (utf8::is_utf8($format)) {  
                 $format = $self->_x($format);  
         }  
   
         my $found = 0;  
   
         my $eval_code;  
         # remove eval{...} from beginning  
         $eval_code = $1 if ($format =~ s/^eval{([^}]+)}//s);  
   
         my $filter_name;  
         # remove filter{...} from beginning  
         $filter_name = $1 if ($format =~ s/^filter{([^}]+)}//s);  
   
         # do actual replacement of placeholders  
         # repeatable fields  
         $format =~ s/v(\d+)(?:\^(\w))?/$self->get_data(\$rec,$1,$2,$i,\$found)/ges;  
         # non-repeatable fields  
         $format =~ s/s(\d+)(?:\^(\w))?/$self->get_data(\$rec,$1,$2,0,\$found)/ges;  
   
         if ($found) {  
                 $log->debug("format: $format");  
                 if ($eval_code) {  
                         my $eval = $self->fill_in($rec,$eval_code,$i);  
                         return if (! $self->_eval($eval));  
                 }  
                 if ($filter_name && $self->{'filter'}->{$filter_name}) {  
                         $log->debug("filter '$filter_name' for $format");  
                         $format = $self->{'filter'}->{$filter_name}->($format);  
                         return unless(defined($format));  
                         $log->debug("filter result: $format");  
                 }  
                 # do we have lookups?  
                 if ($self->{'lookup'}) {  
                         return $self->lookup($format);  
                 } else {  
                         return $format;  
                 }  
         } else {  
                 return;  
         }  
 }  
   
   
 =head2 get_data  
   
 Returns value from record.  
   
  my $text = $self->get_data(\$rec,$f,$sf,$i,\$found);  
   
 Arguments are:  
 record reference C<$rec>,  
 field C<$f>,  
 optional subfiled C<$sf>,  
 index for repeatable values C<$i>.  
   
 Optinal variable C<$found> will be incremeted if there  
 is field.  
   
 Returns value or empty string.  
   
 =cut  
   
 sub get_data {  
         my $self = shift;  
   
         my ($rec,$f,$sf,$i,$found) = @_;  
   
         if ($$rec->{$f}) {  
                 return '' if (! $$rec->{$f}->[$i]);  
                 no strict 'refs';  
                 if ($sf && $$rec->{$f}->[$i]->{$sf}) {  
                         $$found++ if (defined($$found));  
                         return $$rec->{$f}->[$i]->{$sf};  
                 } elsif ($$rec->{$f}->[$i]) {  
                         $$found++ if (defined($$found));  
                         # it still might have subfield, just  
                         # not specified, so we'll dump all  
                         if ($$rec->{$f}->[$i] =~ /HASH/o) {  
                                 my $out;  
                                 foreach my $k (keys %{$$rec->{$f}->[$i]}) {  
                                         $out .= $$rec->{$f}->[$i]->{$k}." ";  
                                 }  
                                 return $out;  
                         } else {  
                                 return $$rec->{$f}->[$i];  
                         }  
                 }  
         } else {  
                 return '';  
         }  
 }  
   
   
31  =head2 progress_bar  =head2 progress_bar
32    
33  Draw progress bar on STDERR.  Draw progress bar on STDERR.
# Line 269  sub _eval { Line 132  sub _eval {
132          return $ret || undef;          return $ret || undef;
133  }  }
134    
 =head2 _sort_by_order  
   
 Sort xml tags data structure accoding to C<order=""> attribute.  
   
 =cut  
   
 sub _sort_by_order {  
         my $self = shift;  
   
         my $va = $self->{'import_xml'}->{'indexer'}->{$a}->{'order'} ||  
                 $self->{'import_xml'}->{'indexer'}->{$a};  
         my $vb = $self->{'import_xml'}->{'indexer'}->{$b}->{'order'} ||  
                 $self->{'import_xml'}->{'indexer'}->{$b};  
   
         return $va <=> $vb;  
 }  
   
 =head2 _x  
   
 Convert string from UTF-8 to code page defined in C<import_xml>.  
   
  my $text = $webpac->_x('utf8 text');  
   
 Default application code page is C<ISO-8859-2>. You will probably want to  
 change that when creating new instance of object based on this one.  
   
 =cut  
   
 sub _x {  
         my $self = shift;  
         my $utf8 = shift || return;  
   
         # create UTF-8 convertor for import_xml files  
         $self->{'utf2cp'} ||= Text::Iconv->new('UTF-8' ,$self->{'code_page'} || 'ISO-8859-2');  
   
         return $self->{'utf2cp'}->convert($utf8) ||  
                 $self->_get_logger()->logwarn("can't convert '$utf8'");  
 }  
   
135  =head2 _init_logger  =head2 _init_logger
136    
137  This function will init C<Log::Log4perl> using provided configuration file.  This function will init C<Log::Log4perl> using provided configuration file.
# Line 318  If no path to configuration file is give Line 142  If no path to configuration file is give
142  will be created. If any mode which inherits from this one is called  will be created. If any mode which inherits from this one is called
143  with C<debug> flag, it will turn logging to debug level.  with C<debug> flag, it will turn logging to debug level.
144    
145    This function will also read C<log_conf> value from current object and try
146    to read that as configuration file if it exists, if it doesn't it will
147    fallback to default C<conf/log.conf>.
148    
149    You can disable all logging by adding C<no_log> to constructor of WebPAC
150    object. Object in C<Test::Exception> class will disable logging
151    automatically.
152    
153  =cut  =cut
154    
155  sub _init_logger {  sub _init_logger {
156          my $self = shift;          my $self = shift;
157          my $file = shift;          my $file = shift;
158          if ($file) {          $file ||= $self->{'log_conf'};
159                  Log::Log4perl->init($file);          $file = 'conf/log.conf';
160          } else {          my $name = (caller(2))[3] || caller;
161                  my $conf = q( );  
162                  if ($self->{'debug'}) {          my $conf = q( );
163                          $conf = << '_log4perl_';          if ($self->{'no_log'}) {
164                    warn "# $name disabled logging\n" if ($log_debug);
165            } elsif ($self->{'debug'}) {
166                    $conf = << '_log4perl_';
167    
168  log4perl.rootLogger=INFO, SCREEN  log4perl.rootLogger=INFO, SCREEN
169    
# Line 339  log4perl.appender.SCREEN.layout=PatternL Line 174  log4perl.appender.SCREEN.layout=PatternL
174  log4perl.appender.SCREEN.layout.ConversionPattern=%d %p> %F{1}:%L %M - %m%n  log4perl.appender.SCREEN.layout.ConversionPattern=%d %p> %F{1}:%L %M - %m%n
175    
176  _log4perl_  _log4perl_
177                  }                  warn "# $name is using debug logger\n" if ($log_debug);
178                  Log::Log4perl->init( \$conf );          } elsif ($name =~ m/Test::Exception/o) {
179                    warn "# disabled logging for Text::Exception\n" if ($log_debug);
180            } elsif (-e $file) {
181                    warn "# $name is using $file logger\n" if ($log_debug);
182                    Log::Log4perl->init($file);
183                    return 1;
184            } else {
185                    warn "# $name is using null logger\n" if ($log_debug);
186          }          }
187            Log::Log4perl->init( \$conf );
188    
189            return 1;
190  }  }
191    
192    
# Line 357  method Line 202  method
202  sub _get_logger {  sub _get_logger {
203          my $self = shift;          my $self = shift;
204    
205          $self->{'_logger_ok'} ||= $self->_init_logger;          my $name = (caller(2))[3] || caller;
206            $self->{'_logger_'} ||= $self->_init_logger;
207    
208            warn "# get_logger( $name )\n" if ($log_debug);
209    
         my $name = (caller(1))[3] || caller;  
210          return get_logger($name);          return get_logger($name);
211  }  }
212    
213    
214    =head2 _log
215    
216    Quick cludge to make logging object available to scripts which
217    use webpac line this:
218    
219      my $log = _new WebPAC::Common()->_get_logger();
220    
221    =cut
222    
223    sub _new {
224            my $class = shift;
225            my $self = {@_};
226            bless($self, $class);
227    
228            $self ? return $self : return undef;
229    }
230    
231  =head1 LOGGING  =head1 LOGGING
232    
233  Logging in WebPAC is performed by L<Log::Log4perl> with config file  Logging in WebPAC is performed by L<Log::Log4perl> with config file
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