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package WebPAC::Tree; |
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use warnings; |
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use strict; |
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use Carp; |
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use Log::Log4perl qw(get_logger :levels); |
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use YAML; |
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=head1 NAME |
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WebPAC::Tree - create tree from lookup data |
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=head1 DESCRIPTION |
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This module will create tree from lookup data. It requires quite complicated |
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data structure, but once you get hang of that, it's peace of case :-) |
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Data structure for tree definition is non-recursive, and defines each level |
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of tree individually (so you can limit depth of tree) like this: |
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my $l = $webpac->{'lookup'}; |
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my @tree = ({ |
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# level 0 |
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code_arr => sub { @{$_[0]} }, |
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filter_code => sub { shift }, |
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lookup_v900 => sub { |
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my ($c,$p) = @_; |
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$p =~ s/^a:(..:....):.*$/$1/; |
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return "a:".$p.":".$c; |
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}, |
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lookup_term => sub { shift @{$l->{"d:".$_[0]}} }, |
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lookup_mfn => sub { shift @{$l->{"900_mfn:".$_[0]}} }, |
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have_children => sub { return $l->{$_[1]} }, |
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},{ |
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# level 1 |
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code_arr => sub { @{$_[0]} }, |
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filter_code => sub { shift }, |
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lookup_v900 => sub { |
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my ($c,$p) = @_; |
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$p =~ s/^a:(..:....):.*$/$1/; |
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return "a:".$p.":".$c; |
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}, |
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lookup_term => sub { shift @{$l->{"d:".$_[0]}} }, |
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lookup_mfn => sub { shift @{$l->{"900_mfn:".$_[0]}} }, |
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have_children => sub { 0 }, |
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)}; |
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You can, however, create recursion with C<have_children_at_level> discussed |
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below, but you loose ability to limit tree depth or to specify different |
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style for each level. |
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Documentation for each element of tree is little sparse, but here it is: |
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=over 5 |
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=item code_arr |
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Called once for each level. |
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@mfns = $t->{'code_arr'}->($start_code); |
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Returns codes for this level. |
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=item filter_code |
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Optional function (which can be replaced by C<shift>) to filter which codes |
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are displayed. |
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$t->{'filter_code'}->($code); |
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Returns code or C<false> if code has to be skipped. |
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=item lookup_v900 |
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Lookup value which will be called C<$v900> from now on. |
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my $v900 = $t->{'lookup_v900'}->($code); |
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=item lookup_term |
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Lookup term value, displayed as name of tree element. |
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my $term = $t->{'lookup_term'}->($code,$v900); |
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=item lookup_mfn |
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Lookup mfn value, used to create hyperlink from tree. |
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my $mfn = $t->{'lookup_mfn'}->($code,$v900); |
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=item have_children |
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Returns children for next iteration of tree generation or undef. |
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my $next_lvl = $t->{'have_children'}->($code,$v900); |
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=item have_children_at_level |
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Returns children for next iteration and next level. |
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my ($level,$next_lvl) = $t->{'have_children_at_level'}->($code,$v900); |
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It's safe to return undef just for next level data (C<$next_lvl> in example |
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above) to stop recursion. |
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=back |
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=head1 METHODS |
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=head2 new |
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Create new tree object |
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my $tree = new WebPAC::Tree( |
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dir => './out', |
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html => 'browse.html', |
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template => './output_template/tree.tt', |
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js => 'tree-ids.js', |
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tree => \@tree, |
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log => 'log4perl.conf', |
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); |
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C<dir> is output directory in which html files and JavaScript files will be |
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created (think of it as C<public_html>). |
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C<html> is name of output html file. |
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C<template> is name of template. It uses Template Toolkit syntax [% var %], |
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but doesn't really use TT. |
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C<js> is name of JavaScript file with shown and hidden ids. |
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C<tree> is tree array with levels of tree described above. |
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C<log> is optional parametar which specify filename of L<Log::Log4Perl> |
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config file. Default is C<log.conf>. |
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=cut |
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sub new { |
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my $class = shift; |
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my $self = {@_}; |
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bless($self, $class); |
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my $log_file = $self->{'log'} || "log.conf"; |
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Log::Log4perl->init($log_file); |
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my $log = $self->_get_logger(); |
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foreach my $p (qw(dir html template js tree)) { |
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$log->logconfess("need $p") unless ($self->{$p}); |
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} |
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$self->{'show_ids'} = []; |
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$self->{'hide_ids'} = []; |
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my $html = $self->unroll(0,()); |
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$log->logdie("no html generated by unroll...") unless ($html); |
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my $html_file = $self->{'dir'}.'/'.$self->{'html'}; |
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open(TEMPLATE, $self->{'template'}) || $log->logdie("can't open '",$self->{'template'},": $!"); |
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my $tmpl; |
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while(<TEMPLATE>) { |
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$tmpl .= $_; |
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} |
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close(TEMPLATE); |
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$log->info("creating '$html_file' with tree"); |
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my $js_arr_file = $self->{'js'}; |
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$tmpl =~ s/\[%\s+js\s+%\]/$js_arr_file/gi; |
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$tmpl =~ s/\[%\s+tree\s+%\]/$html/gi; |
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open(HTML, ">", $html_file) || $log->logdie("can't open '$html_file': $!"); |
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print HTML $tmpl; |
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close(HTML); |
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$self->generate_js(); |
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return $self; |
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} |
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=head2 unroll |
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Generate tree recursively. |
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my $html = $tree->unroll($level,$data_arr); |
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=cut |
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sub unroll { |
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my $self = shift; |
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my ($level,$data_arr) = @_; |
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my $log = $self->_get_logger(); |
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if (! defined($level)) { |
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$log->warn("level is undef, stoping recursion..."); |
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return; |
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} |
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my $next_level = $level + 1; |
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$log->logconfess("need level") unless (defined($level)); |
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#$log->logconfess("need data_arr") unless (defined($data_arr)); |
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my $tree = $self->{'tree'}; |
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$log->logconfess("tree is not defined") unless (defined($tree)); |
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# all levels passed? |
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return if (! defined($tree->[$level])); |
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$log->debug("unroll level $level"); |
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my $html; |
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foreach my $code ($tree->[$level]->{'code_arr'}->($data_arr)) { |
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if ($code = $tree->[$level]->{'filter_code'}->($code)) { |
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$log->debug("# $level filter passed code $code"); |
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my $v900 = $tree->[$level]->{'lookup_v900'}->($code) || $log->warn("can't lookup_v900($code)") && return; |
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$log->debug("# $level lookup_v900($code) = $v900"); |
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my $term = $tree->[$level]->{'lookup_term'}->($code,$v900) || $log->warn("can't lookup_term($code,$v900)") && next; |
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$log->debug("# $level lookup_term($code,$v900) = $term"); |
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my $mfn = $tree->[$level]->{'lookup_mfn'}->($code,$v900) || $log->warn("can't lookup_mfn($code,$v900)") && next; |
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$log->debug("# $level lookup_mfn($code,$v900) = $mfn"); |
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$log->debug("$code -> $v900 : $term [$mfn]"); |
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my ($link_start,$link_end) = ('',''); |
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my $have_children = $tree->[$level]->{'have_children'}->($code,$v900); |
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if (! $have_children) { |
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$log->debug("# $level doesn't have_children($code,$v900)"); |
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($next_level,$have_children) = $tree->[$level]->{'have_children_at_level'}->($code,$v900) if ($tree->[$level]->{'have_children_at_level'}); |
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$log->debug("# $level have_children($code,$v900) on level $next_level") if ($have_children); |
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} |
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($link_start,$link_end) = (qq{<a href="#mfn$mfn" onClick="return toggle_display('id$mfn');">},qq{</a>}) if ($have_children); |
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my $mfn_link = "thes/$mfn.html"; |
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if (-e "out/$mfn_link") { |
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$html .= " " x $level . |
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qq{<li><a name="mfn${mfn}"></a>${link_start}<span id="o$mfn">${term}</span>${link_end}}. |
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qq{ <a href="$mfn_link" onClick="javascript:return popup(this);">»</a></li>\n}; |
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} else { |
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$log->warn("file 'out/$mfn_link' doesn't exist, skipping"); |
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} |
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unless ($have_children) { |
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next; |
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} |
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my $style = $tree->[$level]->{'style'}; |
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$html .= " " x $level . |
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qq{<ul id="id$mfn"}. |
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($style ? ' style="'.$style.'"' : ''). |
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qq{>\n}; |
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if ($style) { |
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if ($style =~ m/display\s*:\s*none/i) { |
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push @{$self->{'hide_ids'}}, "id$mfn"; |
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} else { |
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push @{$self->{'show_ids'}}, "id$mfn"; |
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} |
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} else { |
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# default: show |
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push @{$self->{'show_ids'}}, "id$mfn"; |
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} |
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$html .= $self->unroll($next_level, $have_children); |
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$html .= " " x $level . qq{</ul>\n}; |
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} |
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} |
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return $html; |
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} |
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=head2 generate_js |
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Generate JavaScript arrays C<show> and C<hide> used to toggle display of |
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elements. |
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$tree->generate_js(); |
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=cut |
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sub generate_js { |
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my $self = shift; |
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my $log = $self->_get_logger(); |
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my $js_file = $self->{'dir'}.'/'.$self->{'js'}; |
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$log->info("creating '$js_file' with arrays of shown and hidden ids"); |
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open(JS, ">", $js_file) || $log->logdie("can't open '$js_file': $!"); |
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print JS "var show = ['",join("','",@{$self->{'show_ids'}}),"'];\n"; |
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print JS "var hide = ['",join("','",@{$self->{'hide_ids'}}),"'];\n"; |
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close(JS); |
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$log->debug("stored ",scalar @{$self->{'show_ids'}}," shown and ",scalar @{$self->{'hide_ids'}}," hidden elements"); |
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} |
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# |
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=head1 INTERNAL METHODS |
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You shouldn't call this methods directly. |
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=head2 _get_logger |
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Get C<Log::Log4perl> object with a twist: domains are defined for each |
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method |
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my $log = $webpac->_get_logger(); |
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=cut |
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sub _get_logger { |
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my $self = shift; |
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my $name = (caller(1))[3] || caller; |
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return get_logger($name); |
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} |
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1; |
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