--- loncom/interface/lonsearchcat.pm 2001/03/19 16:45:38 1.41 +++ loncom/interface/lonsearchcat.pm 2002/06/18 21:36:38 1.121 @@ -1,113 +1,307 @@ -# The LearningOnline Network +# The LearningOnline Network with CAPA # Search Catalog # -# 03/08/2001 Scott Harrison +# $Id: lonsearchcat.pm,v 1.121 2002/06/18 21:36:38 matthew Exp $ # -# Functions +# Copyright Michigan State University Board of Trustees # -# handler(server reference) : interacts with the Apache server layer -# (for /adm/searchcat URLs) -# simpletextfield(name,value) : returns HTML formatted string for simple text -# field -# simplecheckbox(name,value) : returns HTML formatted string for simple -# checkbox -# searchphrasefield(title,name,value) : returns HTML formatted string for -# a search expression phrase field -# dateboxes(name, defaultmonth, defaultday, defaultyear) : returns HTML -# formatted string -# for a calendar date -# selectbox(title,name,value,%HASH=options) : returns HTML formatted string for -# a selection box field -# advancedsearch() : -# filled(field) : determines whether a given field has been filled -# basicsearch() : -# output_blank_field_error() : outputs a message saying that more fields need -# to be filled in -# output_results() : outputs results from search -# build_SQL_query() : builds a SQL query string from a logical expression -# with AND/OR keywords +# This file is part of the LearningOnline Network with CAPA (LON-CAPA). +# +# LON-CAPA is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# LON-CAPA is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with LON-CAPA; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +# +# /home/httpd/html/adm/gpl.txt +# +# http://www.lon-capa.org/ +# +# YEAR=2001 +# 3/8, 3/12, 3/13, 3/14, 3/15, 3/19 Scott Harrison +# 3/20, 3/21, 3/22, 3/26, 3/27, 4/2, 8/15, 8/24, 8/25 Scott Harrison +# 10/12,10/14,10/15,10/16,11/28,11/29,12/10,12/12,12/16 Scott Harrison +# YEAR=2002 +# 1/17 Scott Harrison +# 6/17 Matthew Hall +# +############################################################################### +############################################################################### + +=pod + +=head1 NAME + +lonsearchcat + +=head1 SYNOPSIS + +Search interface to LON-CAPAs digital library + +=head1 DESCRIPTION + +This module enables searching for a distributed browseable catalog. + +This is part of the LearningOnline Network with CAPA project +described at http://www.lon-capa.org. + +lonsearchcat presents the user with an interface to search the LON-CAPA +digital library. lonsearchcat also initiates the execution of a search +by sending the search parameters to LON-CAPA servers. The progress of +search (on a server basis) is displayed to the user in a seperate window. + +=head1 Internals + +=over 4 + +=cut + +############################################################################### +############################################################################### + +## ## +## ORGANIZATION OF THIS PERL MODULE ## +## ## +## 1. Modules used by this module ## +## 2. Choices for different output views (detailed, summary, xml, etc) ## +## 3. BEGIN block (to be run once after compilation) ## +## 4. Handling routine called via Apache and mod_perl ## +## 5. Other subroutines ## +## ## +############################################################################### package Apache::lonsearchcat; +# ------------------------------------------------- modules used by this module use strict; use Apache::Constants qw(:common); use Apache::lonnet(); use Apache::File(); use CGI qw(:standard); use Text::Query; +use GDBM_File; +use Apache::loncommon(); + +# ---------------------------------------- variables used throughout the module + +###################################################################### +###################################################################### + +=pod + +=item Global variables + +=over 4 + +=item %hostdomains + +matches host name to host domain + +=item %hostips + +matches host name to host ip + +=item %hitcount + +stores number of hits per host + +=item $closebutton + +button that closes the search window + +=item $importbutton + +button to take the selecte results and go to group sorting + +=item $hidden + +holds 'hidden' html forms + +=item $scrout + +string that holds portions of the screen output + +=item $yourself + +allows for quickly limiting to oneself + +=item %hash + +The ubiquitous database hash + +=item $basicviewselect and $advancedviewselect + +View selection forms. These are not actually global and will be +moved soon. + +=item $diropendb + +The full path to the (temporary) search database file. This is set and +used in &handler() and is also used in &output_results(). + +=back + +=cut + +###################################################################### +###################################################################### + +# -- information holders +my %hostdomains; # matches host name to host domain +my %hostips; # matches host name to host ip +my %hitcount; # stores number of hits per host + +# -- dynamically rendered interface components +my $closebutton; # button that closes the search window +my $importbutton; # button to take the selected results and go to group sorting +my $hidden; # Holds 'hidden' html forms + +# -- miscellaneous variables +my $scrout; # string that holds portions of the screen output +my $yourself; # allows for quickly limiting to oneself +my %hash; # database hash + +# ------------------------------------------ choices for different output views +# Detailed Citation View ---> sub detailed_citation_view +# Summary View ---> sub summary_view +# Fielded Format ---> sub fielded_format_view +# XML/SGML ---> sub xml_sgml_view +my $basicviewselect=< + + + + + +END +my $advancedviewselect=< + + + + + +END + +#------------------------------------------------------------- global variables +my $diropendb = ""; +my $domain = ""; + +# ----------------------------------------------------------------------- BEGIN + +=pod -my %language; -my $scrout; -my %metadatafields; -my %cprtag; -my %mimetag; +=item BEGIN block +Load %hostdomains and %hostips with data from lonnet.pm. Only library +servers are considered. + +=cut + +BEGIN { + foreach (keys (%Apache::lonnet::libserv)) { + $hostdomains{$_}=$Apache::lonnet::hostdom{$_}; + $hostips{$_}=$Apache::lonnet::hostip{$_}; + } +} + +###################################################################### +###################################################################### + +=pod + +=item &handler() - main handler invoked by httpd child + +=cut + +###################################################################### +###################################################################### +# ----------------------------- Handling routine called via Apache and mod_perl sub handler { my $r = shift; - -# -------------------------------------- see if called from an interactive mode - map { - my ($name, $value) = split(/=/,$_); - $value =~ tr/+/ /; - $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg; - if ($name eq 'catalogmode') { - $ENV{'form.'.$name}=$value; - } - } (split(/&/,$ENV{'QUERY_STRING'})); + untie %hash; $r->content_type('text/html'); $r->send_http_header; return OK if $r->header_only; - %metadatafields=(); + my $domain = $r->dir_config('lonDefDomain'); + $diropendb= "/home/httpd/perl/tmp/".&Apache::lonnet::unescape($domain). + "\_".&Apache::lonnet::unescape($ENV{'user.name'})."_searchcat.db"; + + &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'}, + ['catalogmode','launch','acts','mode','form','element']); + + if ($ENV{'form.launch'} eq '1') { + if (tie(%hash,'GDBM_File',$diropendb,&GDBM_WRCREAT,0640)) { + &start_fresh_session(); + untie %hash; + } + else { + $r->print('Unable to tie hash to db '. + 'file'); + return OK; + } + } + +# --------------------------- Produce some output, so people know it is working - my $hidden=''; - $hidden=< -END + $r->print("\n"); + $r->rflush; -# ------------------------------------------------ First, check out environment - $metadatafields{'owner'}=$ENV{'user.name'}.'@'.$ENV{'user.domain'}; +# ----------------------------------- configure dynamic components of interface -# --------------------------------- Compute various listings of metadata values - - %language=(); - $language{'any'}='Any language'; - { - my $fh=Apache::File->new($r->dir_config('lonTabDir').'/language.tab'); - map { - $_=~/(\w+)\s+([\w\s\-]+)/; - $language{$1}=$2; - } <$fh>; - } - - %cprtag=(); - $cprtag{'any'}='Any copyright/distribution'; - { - my $fh=Apache::File->new($r->dir_config('lonIncludes').'/copyright.tab'); - map { - $_=~/(\w+)\s+([\w\s\-]+)/; - $cprtag{$1}=$2; - } <$fh>; - } - - %mimetag=(); - $mimetag{'any'}='Any type'; - { - my $fh=Apache::File->new($r->dir_config('lonTabDir').'/filetypes.tab'); - map { - $_=~/(\w+)\s+(\w+)\s+([\w\s\-]+)/; - $mimetag{$1}=".$1 $3"; - } <$fh>; + if ($ENV{'form.catalogmode'} eq 'interactive') { + $hidden="". + "\n"; + $closebutton=""."\n"; } + elsif ($ENV{'form.catalogmode'} eq 'groupsearch') { + $hidden=< +END + $closebutton=< +END + $importbutton=< +END + } + $hidden .= < + + + +END +# ------------------------------------------------------ Determine current user + $yourself=$ENV{'user.name'}.'@'.$ENV{'user.domain'}; + +# --- Now, depending on the interface actions, do one of three things here: +# --- 1. a basic search +# --- 2. an advanced search +# --- 3. output a search interface +# ----------------------------------- See if a search invocation should be done if ($ENV{'form.basicsubmit'} eq 'SEARCH') { - return &basicsearch($r,\%ENV); + untie %hash; return &basicsearch($r,\%ENV); } elsif ($ENV{'form.advancedsubmit'} eq 'SEARCH') { - return &advancedsearch($r,\%ENV); + untie %hash; return &advancedsearch($r,\%ENV); } +# ----------------------------- Else, begin building search interface to output $scrout=''; # building a part of screen output $scrout.=&searchphrasefield('Limit by title','title', $ENV{'form.title'}); @@ -124,8 +318,8 @@ END $scrout.=&searchphrasefield('Limit by URL','url', $ENV{'form.url'}); - $scrout.=&searchphrasefield('Limit by version','version', - $ENV{'form.version'}); +# $scrout.=&searchphrasefield('Limit by version','version', +# $ENV{'form.version'}); $scrout.=&searchphrasefield('Limit by notes','notes', $ENV{'form.notes'}); @@ -133,22 +327,27 @@ END $scrout.=&searchphrasefield('Limit by abstract','abstract', $ENV{'form.abstract'}); - $ENV{'form.mime'}='notxxx' unless length($ENV{'form.mime'}); + $ENV{'form.mime'}='any' unless length($ENV{'form.mime'}); $scrout.=&selectbox('Limit by MIME type','mime', - $ENV{'form.mime'},%mimetag); + $ENV{'form.mime'}, + 'any','Any type', + \&{Apache::loncommon::filedescriptionex}, + (&Apache::loncommon::fileextensions)); $ENV{'form.language'}='any' unless length($ENV{'form.language'}); $scrout.=&selectbox('Limit by language','language', - $ENV{'form.language'},%language); - + $ENV{'form.language'},'any','Any Language', + \&{Apache::loncommon::languagedescription}, + (&Apache::loncommon::languageids), + ); # ------------------------------------------------ Compute date selection boxes $scrout.=< LIMIT BY CREATION DATE RANGE: -
+
between: CREATIONDATESTART $scrout.=&dateboxes('creationdatestart',1,1,1976, @@ -170,7 +369,7 @@ CREATIONDATEEND

LIMIT BY LAST REVISION DATE RANGE: -
between: +
between: LASTREVISIONDATESTART $scrout.=&dateboxes('lastrevisiondatestart',1,1,1976, $ENV{'form.lastrevisiondatestart_month'}, @@ -189,64 +388,89 @@ LASTREVISIONDATEEND $scrout.=&searchphrasefield('Limit by publisher/owner','owner', $ENV{'form.owner'}); -# $metadatafields{'owner'}); $ENV{'form.copyright'}='any' unless length($ENV{'form.copyright'}); $scrout.=&selectbox('Limit by copyright/distribution','copyright', - $ENV{'form.copyright'},%cprtag); + $ENV{'form.copyright'}, + 'any','Any copyright/distribution', + \&{Apache::loncommon::copyrightdescription}, + (&Apache::loncommon::copyrightids), + ); # ------------------------------------------- Compute customized metadata field $scrout.=< -LIMIT BY OTHER METADATA FIELDS: +LIMIT BY SPECIAL METADATA FIELDS: -For author-specific metadata, enter in an expression in the form of -key=value separated by operators such as AND or OR.
+For resource-specific metadata, enter in an expression in the form of +key=value separated by operators such as AND, OR or NOT.
Example: grandmother=75 OR grandfather=85 -
+
CUSTOMMETADATA $scrout.=&simpletextfield('custommetadata',$ENV{'form.custommetadata'}); $scrout.=' initial users of this system do not need to worry about this option'; + $scrout.=< +SHOW SPECIAL METADATA FIELDS: + +Enter in a space-separated list of special metadata fields to show +in a fielded listing for each record result. +
+CUSTOMSHOW +$scrout.=&simpletextfield('customshow',$ENV{'form.customshow'}); +$scrout.=' initial users of this system do not need to worry about this option'; + # ---------------------------------------------------------------- Print screen $r->print(< The LearningOnline Network with CAPA + - +

Search Catalog

$hidden -
+

Basic Search

Enter terms or phrases separated by search operators -such as AND or OR then press SEARCH below. Terms should be specific +such as AND, OR, or NOT then press SEARCH below. Terms should be specific to the title, author, subject, notes, or abstract information associated with a resource. -
+
ENDDOCUMENT $r->print(&simpletextfield('basicexp',$ENV{'form.basicexp'})); $r->print(' '); $r->print(&simplecheckbox('titleonly',$ENV{'form.titleonly'})); $r->print('Title only '); - $r->print(&simplecheckbox('allversions',$ENV{'form.allversions'})); +# $r->print(&simplecheckbox('allversions',$ENV{'form.allversions'})); +# Search historic archives $r->print(<Search historic archives -
- - - +
+ + +$closebutton +$basicviewselect +

-
+

Advanced Search

$scrout

- - - + + +$closebutton +$advancedviewselect +

@@ -255,195 +479,153 @@ ENDDOCUMENT return OK; } +###################################################################### +###################################################################### + +=pod + +=item &make_persistent() + +Returns a scalar which holds the current ENV{'form.*'} values in +a 'hidden' html input tag. +=cut + +###################################################################### +###################################################################### + +# ------------------------------------------------------------- make persistent + +sub make_persistent { + my $persistent=''; + + foreach (keys %ENV) { + if (/^form\./ && !/submit/) { + my $name=$_; + my $key=$name; + $ENV{$key}=~s/\'//g; # do not mess with html field syntax + $name=~s/^form\.//; + $persistent.=< +END + } + } + return $persistent; +} + # --------------------------------------------------------- Various form fields sub simpletextfield { my ($name,$value)=@_; - return ''; + return ''; } sub simplecheckbox { my ($name,$value)=@_; my $checked=''; $checked="CHECKED" if $value eq 'on'; - return ''; + return ''; } sub searchphrasefield { my ($title,$name,$value)=@_; my $instruction=<$uctitle:". - " $instruction
". - ''; + " $instruction
". + ''; } sub dateboxes { my ($name,$defaultmonth,$defaultday,$defaultyear, $currentmonth,$currentday,$currentyear)=@_; ($defaultmonth,$defaultday,$defaultyear)=('','',''); - my $month=< - - - - - - - - - - - - - - -END - $month=~s/(\"$currentmonth\")/$1 SELECTED/ if length($currentmonth); + # + # Day my $day=< - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - END + for (my $i = 1; $i<=31; $i++) { + $day.="\n"; + } + $day.="\n"; $day=~s/(\"$currentday\")/$1 SELECTED/ if length($currentday); + # + # Month + my $month=< + +END + my $i = 1; + foreach (qw/January February March April May June + July August September October November December /){ + $month .="\n"; + $i++; + } + $month.="\n"; + $month=~s/(\"$currentmonth\")/$1 SELECTED/ if length($currentmonth); + # + # Year (obviously) my $year=< - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - END + my $maxyear = 2051; + for (my $i = 1976; $i<=$maxyear; $i++) { + $year.="\n"; + } + $year.="\n"; $year=~s/(\"$currentyear\")/$1 SELECTED/ if length($currentyear); return "$month$day$year"; } sub selectbox { - my ($title,$name,$value,%options)=@_; + my ($title,$name,$value,$anyvalue,$anytag,$functionref,@idlist)=@_; my $uctitle=uc($title); my $selout="\n

$uctitle:". - "
".''; + foreach ($anyvalue,@idlist) { + $selout.=''; + } + else {$selout.='>'.&{$functionref}($_).'';} + } return $selout.''; } -# ------------------------------------------------ Performing a advanced search +# ----------------------------------------------- Performing an advanced search sub advancedsearch { my ($r,$envhash)=@_; my %ENV=%{$envhash}; my $fillflag=0; + # Clean up fields for safety + for my $field ('title','author','subject','keywords','url','version', + 'creationdatestart_month','creationdatestart_day', + 'creationdatestart_year','creationdateend_month', + 'creationdateend_day','creationdateend_year', + 'lastrevisiondatestart_month','lastrevisiondatestart_day', + 'lastrevisiondatestart_year','lastrevisiondateend_month', + 'lastrevisiondateend_day','lastrevisiondateend_year', + 'notes','abstract','mime','language','owner', + 'custommetadata','customshow') { + $ENV{"form.$field"}=~s/[^\w\/\s\(\)\=\-\"\']//g; + } + foreach ('mode','form','element') { + # is this required? Hmmm. + next unless (exists($ENV{"form.$_"})); + $ENV{"form.$_"}=&Apache::lonnet::unescape($ENV{"form.$_"}); + $ENV{"form.$_"}=~s/[^\w\/\s\(\)\=\-\"\']//g; + } + # Check to see if enough information was filled in for my $field ('title','author','subject','keywords','url','version', 'notes','abstract','mime','language','owner', 'custommetadata') { @@ -451,230 +633,1150 @@ sub advancedsearch { $fillflag++; } } - unless ($fillflag) { &output_blank_field_error($r); return OK; } - my $query=''; -# my $concatarg=join('," ",', -# ('title', 'author', 'subject', 'notes', 'abstract')); - $query="select * from metadata where concat(title) like '\%$ENV{'form.title'}\%'"; - my $reply=&Apache::lonnet::metadata_query($query); + # Turn the form input into a SQL-based query + my $query=''; - &output_results($r,$envhash,$reply); - return OK; -} + my @queries; + # Evaluate logical expression AND/OR/NOT phrase fields. + foreach my $field ('title','author','subject','notes','abstract','url', + 'keywords','version','owner') { + if ($ENV{'form.'.$field}) { + push @queries,&build_SQL_query($field,$ENV{'form.'.$field}); + } + } + # Evaluate option lists + if ($ENV{'form.language'} and $ENV{'form.language'} ne 'any') { + push @queries,"(language like \"$ENV{'form.language'}\")"; + } + if ($ENV{'form.mime'} and $ENV{'form.mime'} ne 'any') { + push @queries,"(mime like \"$ENV{'form.mime'}\")"; + } + if ($ENV{'form.copyright'} and $ENV{'form.copyright'} ne 'any') { + push @queries,"(copyright like \"$ENV{'form.copyright'}\")"; + } + # Evaluate date windows + my $datequery=&build_date_queries( + $ENV{'form.creationdatestart_month'}, + $ENV{'form.creationdatestart_day'}, + $ENV{'form.creationdatestart_year'}, + $ENV{'form.creationdateend_month'}, + $ENV{'form.creationdateend_day'}, + $ENV{'form.creationdateend_year'}, + $ENV{'form.lastrevisiondatestart_month'}, + $ENV{'form.lastrevisiondatestart_day'}, + $ENV{'form.lastrevisiondatestart_year'}, + $ENV{'form.lastrevisiondateend_month'}, + $ENV{'form.lastrevisiondateend_day'}, + $ENV{'form.lastrevisiondateend_year'}, + ); + # Test to see if date windows are legitimate + if ($datequery=~/^Incorrect/) { + &output_date_error($r,$datequery); + return OK; + } + elsif ($datequery) { + push @queries,$datequery; + } -# ---------------------------------------------------- see if a field is filled -sub filled { - my ($field)=@_; - if ($field=~/\S/) { - return 1; + # Process form information for custom metadata querying + my $customquery=''; + if ($ENV{'form.custommetadata'}) { + $customquery=&build_custommetadata_query('custommetadata', + $ENV{'form.custommetadata'}); } - else { - return 0; + my $customshow=''; + if ($ENV{'form.customshow'}) { + $customshow=$ENV{'form.customshow'}; + $customshow=~s/[^\w\s]//g; + my @fields=split(/\s+/,$customshow); + $customshow=join(" ",@fields); + } + # Send query statements over the network to be processed by either the SQL + # database or a recursive scheme of 'grep'-like actions (for custom + # metadata). + if (@queries) { + $query=join(" AND ",@queries); + $query="select * from metadata where $query"; + my $reply; # reply hash reference + unless ($customquery or $customshow) { + $reply=&Apache::lonnet::metadata_query($query); + } + else { + $reply=&Apache::lonnet::metadata_query($query, + $customquery,$customshow); + } + &output_results('Advanced',$r,$envhash,$customquery,$reply); } + elsif ($customquery) { + my $reply; # reply hash reference + $reply=&Apache::lonnet::metadata_query('', + $customquery,$customshow); + &output_results('Advanced',$r,$envhash,$customquery,$reply); + } + # should not get to this point + return 'Error. Should not have gone to this point.'; } # --------------------------------------------------- Performing a basic search sub basicsearch { my ($r,$envhash)=@_; my %ENV=%{$envhash}; + # Clean up fields for safety + for my $field ('basicexp') { + $ENV{"form.$field"}=~s/[^\w\s\(\)\-]//g; + } + foreach ('mode','form','element') { + # is this required? Hmmm. + next unless (exists($ENV{"form.$_"})); + $ENV{"form.$_"}=&Apache::lonnet::unescape($ENV{"form.$_"}); + $ENV{"form.$_"}=~s/[^\w\/\s\(\)\=\-\"\']//g; + } + # Check to see if enough is filled in unless (&filled($ENV{'form.basicexp'})) { &output_blank_field_error($r); return OK; } + # Build SQL query string based on form page my $query=''; my $concatarg=join('," ",', ('title', 'author', 'subject', 'notes', 'abstract')); + $concatarg='title' if $ENV{'form.titleonly'}; + + $query=&build_SQL_query('concat('.$concatarg.')',$ENV{'form.'.'basicexp'}); + + # Get reply (either a hash reference to filehandles or bad connection) + my $reply=&Apache::lonnet::metadata_query('select * from metadata where '.$query); + + # Output search results + + &output_results('Basic',$r,$envhash,$query,$reply); - $query="select * from metadata where concat($concatarg) like '\%$ENV{'form.basicexp'}\%'"; - my $reply=&Apache::lonnet::metadata_query($query); - &output_results($r,$envhash,$reply); return OK; } -sub output_blank_field_error { - my ($r)=@_; +# ------------------------------------------------------------- build_SQL_query +sub build_SQL_query { + my ($field_name,$logic_statement)=@_; + my $q=new Text::Query('abc', + -parse => 'Text::Query::ParseAdvanced', + -build => 'Text::Query::Build'); + $q->prepare($logic_statement); + my $matchexp=${$q}{'matchexp'}; chomp $matchexp; + my $sql_query=&recursive_SQL_query_build($field_name,$matchexp); + return $sql_query; +} + +# ------------------------------------------------- build custom metadata query +sub build_custommetadata_query { + my ($field_name,$logic_statement)=@_; + my $q=new Text::Query('abc', + -parse => 'Text::Query::ParseAdvanced', + -build => 'Text::Query::BuildAdvancedString'); + $q->prepare($logic_statement); + my $matchexp=${$q}{'-parse'}{'-build'}{'matchstring'}; + # quick fix to change literal into xml tag-matching + # will eventually have to write a separate builder module + my $oldmatchexp=$matchexp; + $matchexp=~s/(\w+)\\=([\w\\\+]+)/\\<$1\\>\[\^\\<\]\*$2\[\^\\<\]\*\\<\\\/$1\\>/g; + return $matchexp; +} + +# - Recursively parse a reverse notation expression into a SQL query expression +sub recursive_SQL_query_build { + my ($dkey,$pattern)=@_; + my @matches=($pattern=~/(\[[^\]|\[]*\])/g); + return $pattern unless @matches; + foreach my $match (@matches) { + $match=~/\[ (\w+)\s(.*) \]/; + my ($key,$value)=($1,$2); + my $replacement=''; + if ($key eq 'literal') { + $replacement="($dkey like \"\%$value\%\")"; + } + elsif ($key eq 'not') { + $value=~s/like/not like/; +# $replacement="($dkey not like $value)"; + $replacement="$value"; + } + elsif ($key eq 'and') { + $value=~/(.*[\"|\)]) ([|\(|\^].*)/; + $replacement="($1 AND $2)"; + } + elsif ($key eq 'or') { + $value=~/(.*[\"|\)]) ([|\(|\^].*)/; + $replacement="($1 OR $2)"; + } + substr($pattern, + index($pattern,$match), + length($match), + $replacement + ); + } + &recursive_SQL_query_build($dkey,$pattern); +} + +# ------------------------------------------------------------ Build date query +sub build_date_queries { + my ($cmonth1,$cday1,$cyear1,$cmonth2,$cday2,$cyear2, + $lmonth1,$lday1,$lyear1,$lmonth2,$lday2,$lyear2)=@_; + my @queries; + if ($cmonth1 or $cday1 or $cyear1 or $cmonth2 or $cday2 or $cyear2) { + unless ($cmonth1 and $cday1 and $cyear1 and + $cmonth2 and $cday2 and $cyear2) { + return "Incorrect entry for the creation date. You must specify ". + "a starting month, day, and year and an ending month, ". + "day, and year."; + } + my $cnumeric1=sprintf("%d%2d%2d",$cyear1,$cmonth1,$cday1); + $cnumeric1+=0; + my $cnumeric2=sprintf("%d%2d%2d",$cyear2,$cmonth2,$cday2); + $cnumeric2+=0; + if ($cnumeric1>$cnumeric2) { + return "Incorrect entry for the creation date. The starting ". + "date must occur before the ending date."; + } + my $cquery="(creationdate BETWEEN '$cyear1-$cmonth1-$cday1' AND '". + "$cyear2-$cmonth2-$cday2 23:59:59')"; + push @queries,$cquery; + } + if ($lmonth1 or $lday1 or $lyear1 or $lmonth2 or $lday2 or $lyear2) { + unless ($lmonth1 and $lday1 and $lyear1 and + $lmonth2 and $lday2 and $lyear2) { + return "Incorrect entry for the last revision date. You must ". + "specify a starting month, day, and year and an ending ". + "month, day, and year."; + } + my $lnumeric1=sprintf("%d%2d%2d",$lyear1,$lmonth1,$lday1); + $lnumeric1+=0; + my $lnumeric2=sprintf("%d%2d%2d",$lyear2,$lmonth2,$lday2); + $lnumeric2+=0; + if ($lnumeric1>$lnumeric2) { + return "Incorrect entry for the last revision date. The ". + "starting date must occur before the ending date."; + } + my $lquery="(lastrevisiondate BETWEEN '$lyear1-$lmonth1-$lday1' AND '". + "$lyear2-$lmonth2-$lday2 23:59:59')"; + push @queries,$lquery; + } + if (@queries) { + return join(" AND ",@queries); + } + return ''; +} + +# ----------------------------- format and output results based on a reply list +# There are two windows that this function writes to. The main search +# window ("srch") has a listing of the results. A secondary window ("popwin") +# gives the status of the network search (time elapsed, number of machines +# contacted, etc.) +sub output_results { + my $fnum; # search result counter + my ($mode,$r,$envhash,$query,$replyref)=@_; + my %ENV=%{$envhash}; + my %rhash=%{$replyref}; + my $compiledresult=''; + my $timeremain=300; + my $elapsetime=0; + my $resultflag=0; + my $tflag=1; + # make query information persistent to allow for subsequent revision - my $persistent=''; - map { - if (/^form\./ && !/submit/) { - my $name=$_; - my $key=$name; - $name=~s/^form\.//; - $persistent.=< -END - } - } (keys %ENV); + my $persistent=&make_persistent(); - $r->print(<print(< The LearningOnline Network with CAPA BEGINNING - $r->print(<print(< + function select_data(title,url) { + changeTitle(title); + changeURL(url); + self.close(); + } + function changeTitle(val) { + if (opener.inf.document.forms.resinfo.elements.t) { + opener.inf.document.forms.resinfo.elements.t.value=val; + } + } + function changeURL(val) { + if (opener.inf.document.forms.resinfo.elements.u) { + opener.inf.document.forms.resinfo.elements.u.value=val; + } + } + +SCRIPT + } elsif ($ENV{'form.mode'} eq 'edit') { + my $form = $ENV{'form.form'}; + my $element = $ENV{'form.element'}; + $r->print(< +function select_data(title,url) { + changeURL(url); + self.close(); +} +function changeTitle(val) { +} +function changeURL(val) { + if (window.opener.document) { + window.opener.document.forms["$form"].elements["$element"].value=val; + } else { + var url = 'forms[\"$form\"].elements[\"$element\"].value'; + alert("Unable to transfer data to "+url); + } +} + +SCRIPT + } + } + $r->print(< + function select_data(title,url) { +// alert('DEBUG: Should be storing '+title+' and '+url); + } + function queue(val) { + if (eval("document.forms.results.returnvalues["+val+"].checked")) { + document.forms.results.acts.value+='1a'+val+'b'; + } + else { + document.forms.results.acts.value+='0a'+val+'b'; + } + } + function select_group() { + window.location= + "/adm/groupsort?mode=$ENV{'form.mode'}&catalogmode=groupsearch&acts="+ + document.forms.results.acts.value; + } + +SCRIPT + $r->print(< + function displayinfo(val) { + popwin.document.forms.popremain.sdetails.value=val; + } + function openhelp(val) { + openhelpwin=open('/adm/help/searchcat.html','helpscreen', + 'scrollbars=1,width=400,height=300'); + openhelpwin.focus(); + } + function abortsearch(val) { + popwin.close(); + } + +SCRIPT + $r->rflush(); + + # begin showing the cataloged results + $r->print(<

Search Catalog

-
-$persistent +CATALOGBEGIN + $r->print(< +$hidden + - -
-

Helpful Message

+onClick='this.form.submit();' /> +$importbutton +$closebutton +$persistent +
+

Search Query

+CATALOGCONTROLS + if ($mode eq 'Basic') { + $r->print(< -Incorrect search query due to blank entry fields. -You need to fill in the relevant -fields on the search page in order for a query to be -processed. +Basic search: $ENV{'form.basicexp'}

- - RESULTS -} - -# ----------------------------- format and output results based on a reply list -sub output_results { - my ($r,$envhash,@replylist)=@_; - my %ENV=%{$envhash}; - foreach my $reply (@replylist) { + } + elsif ($mode eq 'Advanced') { + $r->print(< +Advanced search +$query +

+RESULTS + } + $r->print('

Search Results

'); + $r->rflush(); + my $servernum=(keys %rhash)+0; + + # define server grid (shows status of multiple machines) + my $hcinit; + my $grid="'
'+"; + $grid.="\n"; + my $sn=1; + for my $sk (sort keys %rhash) { + # ''+ + $grid.="'+\"'\"+')\">'+"; + $grid.="\n"; + $grid.="'\"".$sk."\"'+\n"; + $grid.="'
'+\n" unless $sn%10; + $sn++; + } + $r->print(< + popwin=open('','popwin','scrollbars=1,width=400,height=220'); + popwin.focus(); + popwin.document.writeln('<'+'html>'); + popwin.document.writeln('<'+'head>'); + popwin.document.writeln('<'+'script>'); + popwin.document.writeln('hc=new Array();$hcinit'); + popwin.document.writeln('<'+'/script>'); + popwin.document.writeln('<'+'/head>'+ + '<'+'body bgcolor="#FFFFFF">'+ + '<'+'image name="whirly" align="right" src="/adm/lonIcons/'+ + 'lonanim.gif" '+ + 'alt="animated logo" />'+ + '<'+'h3>Search Results Progress<'+'/h3>'+ + '<'+'form name="popremain">'+ + '<'+'tt>'+ + '<'+'br clear="all"/>PLEASE BE PATIENT'+ + '<'+'br />SCANNING $servernum SERVERS'+ + '<'+'br clear="all" />Number of record hits found '+ + '<'+'input type="text" size="10" name="numhits"'+ + ' value="0" />'+ + '<'+'br clear="all" />Time elapsed '+ + '<'+'input type="text" size="10" name="elapsetime"'+ + ' value="0" />'+ + '<'+'br />'+ + 'SERVER GRID (click on any cell for details)'+ + $grid + '<'+'br />'+ + 'Server details '+ + '<'+'input type="text" size="35" name="sdetails"'+ + ' value="" />'+ + '<'+'br />'+ + ' <'+'input type="button" name="button"'+ + ' value="close this window" '+ + ' onClick="javascript:opener.abortsearch()" />'+ + ' <'+'input type="button" name="button"'+ + ' value="help" onClick="javascript:opener.openhelp()" />'+ + '<'+'/tt>'+ + '<'+'/form>'+ + '<'+'/body><'+'/html>'); + popwin.document.close(); + +ENDPOP + $r->rflush(); + my $servercount=0; + my $hitcountsum=0; + my $bloop=$servernum; + my %orkey; + BLOOP: while(1) { + my $sn=0; + last BLOOP unless $bloop; + last BLOOP unless $timeremain; + RLOOP: foreach my $rkey (sort keys %rhash) { + $sn++; + next RLOOP if $orkey{$rkey}; + $servercount++; + $tflag=1; + $compiledresult=''; + my $hostname=$rkey; + my $reply=$rhash{$rkey}; my @results; - + my $replyfile=''; - $reply=~/^([\.\w]+)$/; # must do since 'use strict' checks for tainting - $replyfile=$r->dir_config('lonDaemons').'/tmp/'.$1; - $reply=~/(.*?)\_/; - my $hostname=$1; - - { - while (1) { - last if -e $replyfile; - sleep 1; + + if ($reply eq 'con_lost') { + &popwin_imgupdate($r,$sn,"srvbad.gif"); + $bloop--; + $orkey{$rkey}=1; + } + else { + $reply=~/^([\.\w]+)$/; # must do since 'use strict' checks for tainting + $replyfile=$r->dir_config('lonDaemons').'/tmp/'.$1; + $reply=~/(.*?)\_/; + { + my $temp=0; + WLOOP: while (1) { + if (-e $replyfile && $tflag) { + &popwin_imgupdate($r,$sn,"srvhalf.gif"); + &popwin_js($r,'popwin.hc["'.$rkey.'"]='. + '"still transferring..."'.';'); + $tflag=0; + } + if (-e "$replyfile.end") { + $bloop--; + $orkey{$rkey}=1; + if (-s $replyfile) { + &popwin_imgupdate($r,$sn,"srvgood.gif"); + my $fh=Apache::File->new($replyfile) or + ($r->print('ERROR: file '. + $replyfile.' cannot be opened') and + return OK); + @results=<$fh> if $fh; + $hitcount{$rkey}=@results+0; + &popwin_js($r,'popwin.hc["'.$rkey.'"]='. + $hitcount{$rkey}.';'); + $hitcountsum+=$hitcount{$rkey}; + &popwin_js($r,'popwin.document.forms.popremain.'. + 'numhits.value='.$hitcountsum.';'); + } + else { + &popwin_imgupdate($r,$sn,"srvempty.gif"); + &popwin_js($r,'popwin.hc["'.$rkey.'"]=0;'); + } + last WLOOP; + } + if ($temp>1) { + sleep 1; + $timeremain--; + $elapsetime++; + last WLOOP; + } + last WLOOP unless $timeremain; + sleep 1; + $timeremain--; + $elapsetime++; + &popwin_js($r,"popwin.document.popremain.". + "elapsetime.value=$elapsetime;"); + $temp++; + } } - # QUESTION: how should I handle this error condition.. - # I'm sure there is syntax elsewhere I can use.. - my $fh=Apache::File->new($replyfile) or - ($r->print('file cannot be opened') and return OK); - @results=<$fh>; + &popwin_js($r,'popwin.document.whirly.'. + 'src="/adm/lonIcons/lonanimend.gif";'); } - - my $compiledresult=''; - + my $customshow=''; + my $extrashow=''; + my @customfields; + if ($ENV{'form.customshow'}) { + $customshow=$ENV{'form.customshow'}; + $customshow=~s/[^\w\s]//g; + my @fields=map {"$_:"} + split(/\s+/,$customshow); + @customfields=split(/\s+/,$customshow); + if ($customshow) { + $extrashow="
  • ".join("
  • ",@fields)."
\n"; + } + } + my $customdata=''; + my %customhash; foreach my $result (@results) { - my ($title,$author,$subject,$url,$keywords,$version, - $notes,$abstract,$mime,$lang, - $creationdate,$lastrevisiondate,$owner,$copyright - )=map {&Apache::lonnet::unescape($_)} (split(/\,/,$result)); - my $shortabstract=$abstract; - $shortabstract=substr($abstract,0,200) if length($abstract)>200; - $compiledresult.=<200; + $fields[7]=$shortabstract; + my $shortkeywords=$keywords; + $shortkeywords=substr($keywords,0,200).'...' if length($keywords)>200; + $fields[4]=$shortkeywords; + + my $extrashow2=$extrashow; + if ($extrashow) { + foreach my $field (@customfields) { + my $value=''; + if ($customhash{$url}=~/\<${field}[^\>]*\>(.*?)\<\/${field}[^\>]*\>/s) { + $value=$1; + } + $extrashow2=~s/\<\!\-\- $field \-\-\>/ $value/g; + } + } + + $compiledresult.=< +END + $compiledresult.=< END - $compiledresult.=< +onClick="javascript:select_data('$titleesc','$url')"> -
+
END - $compiledresult.=<URL: $url -
-Title: $title
-Author(s): $author
-Subject: $subject
-Keyword(s): $keywords
-Notes: $notes
-Abstract: $shortabstract
-MIME Type: $mimetag{$mime}
-Language: $language{$lang}
-Creation Date: $creationdate
-Last Revision Date: $lastrevisiondate
-Publisher/Owner: $owner
-Copyright/Distribution: $copyright
-Repository Location: $hostname -

+ } + if ($ENV{'form.catalogmode'} eq 'groupsearch') { + $fnum+=0; + $hash{"pre_${fnum}_link"}=$url; + $hash{"pre_${fnum}_title"}=$title; + $compiledresult.=< + + +
END - } +# +# + $fnum++; + } + my $httphost=$ENV{'HTTP_HOST'}; + + my $viewselect; + if ($mode eq 'Basic') { + $viewselect=$ENV{'form.basicviewselect'}; + } + elsif ($mode eq 'Advanced') { + $viewselect=$ENV{'form.advancedviewselect'}; + } + + if ($viewselect eq 'Detailed Citation View') { + $compiledresult.=&detailed_citation_view(@fields, + $hostname,$httphost, + $extrashow2); + } + elsif ($viewselect eq 'Summary View') { + $compiledresult.=&summary_view(@fields,$hostname,$httphost, + $extrashow2); + } + elsif ($viewselect eq 'Fielded Format') { + $compiledresult.=&fielded_format_view(@fields,$hostname, + $httphost,$extrashow2); + } + elsif ($viewselect eq 'XML/SGML') { + $compiledresult.=&xml_sgml_view(@fields,$hostname,$httphost, + $extrashow2); + } + + } - unless ($compiledresult) { - $compiledresult="There were no results that matched your query"; + untie %hash; + } + else { + $r->print('Unable to tie hash to db '. + 'file'); } + if ($compiledresult) { + $resultflag=1; + } + + $r->print(<print("\nThere were no results that matched your query\n"); + } +# $r->print(''."\n"); $r->rflush(); + $r->print(< + +RESULTS +} - # make query information persistent to allow for subsequent revision - my $persistent=''; - map { - if (/^form\./ && !/submit/) { - my $name=$_; - my $key=$name; - $name=~s/^form\.//; - $persistent.=< +# ------------------------------------------------------ Detailed Citation View +sub detailed_citation_view { + my ($title,$author,$subject,$url,$keywords,$version, + $notes,$shortabstract,$mime,$lang, + $creationdate,$lastrevisiondate,$owner,$copyright, + $hostname,$httphost,$extrashow)=@_; + my $result=<$owner, last revised $lastrevisiondate +

$title

+

$author

+

+

+Subject: $subject
+Keyword(s): $keywords
+Notes: $notes
+MIME Type: END - } - } (keys %ENV); + $result.=&Apache::loncommon::filedescription($mime); + $result.=< +Language: +END + $result.=&Apache::loncommon::languagedescription($lang); + $result.=< +Copyright/Distribution: +END + $result.=&Apache::loncommon::copyrightdescription($copyright); + $result.=< +

+$extrashow +

+$shortabstract +

+END + return $result; +} - $r->print(<$author
+$title
+$owner -- $lastrevisiondate
+$cprtag
+$extrashow +

+END + return $result; +} + +# -------------------------------------------------------------- Fielded Format +sub fielded_format_view { + my ($title,$author,$subject,$url,$keywords,$version, + $notes,$shortabstract,$mime,$lang, + $creationdate,$lastrevisiondate,$owner,$copyright, + $hostname,$httphost,$extrashow)=@_; + my $mimetag=&Apache::loncommon::filedescription($mime); + my $language=&Apache::loncommon::languagedescription($lang); + my $cprtag=&Apache::loncommon::copyrightdescription($copyright); + my $result=<URL: $url +
+Title: $title
+Author(s): $author
+Subject: $subject
+Keyword(s): $keywords
+Notes: $notes
+MIME Type: $mimetag
+Language: $language
+Creation Date: $creationdate
+Last Revision Date: $lastrevisiondate
+Publisher/Owner: $owner
+Copyright/Distribution: $cprtag
+Repository Location: $hostname
+Abstract: $shortabstract
+$extrashow +

+END + return $result; +} + +# -------------------------------------------------------------------- XML/SGML +sub xml_sgml_view { + my ($title,$author,$subject,$url,$keywords,$version, + $notes,$shortabstract,$mime,$lang, + $creationdate,$lastrevisiondate,$owner,$copyright, + $hostname,$httphost,$extrashow)=@_; + my $cprtag=&Apache::loncommon::copyrightdescription($copyright); + my $mimetag=&Apache::loncommon::filedescription($mime); + my $language=&Apache::loncommon::languagedescription($lang); + my $result=< +<LonCapaResource> +<url>$url</url> +<title>$title</title> +<author>$author</author> +<subject>$subject</subject> +<keywords>$keywords</keywords> +<notes>$notes</notes> +<mimeInfo> +<mime>$mime</mime> +<mimetag>$mimetag</mimetag> +</mimeInfo> +<languageInfo> +<language>$lang</language> +<languagetag>$language</languagetag> +</languageInfo> +<creationdate>$creationdate</creationdate> +<lastrevisiondate>$lastrevisiondate</lastrevisiondate> +<owner>$owner</owner> +<copyrightInfo> +<copyright>$copyright</copyright> +<copyrighttag>$cprtag</copyrighttag> +</copyrightInfo> +<repositoryLocation>$hostname</repositoryLocation> +<shortabstract>$shortabstract</shortabstract> +</LonCapaResource> + +$extrashow +END + return $result; +} + +# ---------------------------------------------------- see if a field is filled +sub filled { + my ($field)=@_; + if ($field=~/\S/ && $field ne 'any') { + return 1; + } + else { + return 0; + } +} + +# ---------------- Message to output when there are not enough fields filled in +sub output_blank_field_error { + my ($r)=@_; + # make query information persistent to allow for subsequent revision + my $persistent=&make_persistent(); + + $r->print(< The LearningOnline Network with CAPA BEGINNING - $r->print(< - function select_data(title,url) { - changeTitle(title); - changeURL(url); - } - function changeTitle(val) { - if (opener.inf.document.forms.resinfo.elements.t) { - opener.inf.document.forms.resinfo.elements.t.value=val; - } - } - function changeURL(val) { - if (opener.inf.document.forms.resinfo.elements.u) { - opener.inf.document.forms.resinfo.elements.u.value=val; - } - } - -SCRIPT - $r->print(<print(< - +

Search Catalog

+$persistent - +onClick='this.form.submit();' /> +$closebutton +
+

Helpful Message

+

+Incorrect search query due to blank entry fields. +You need to fill in the relevant +fields on the search page in order for a query to be +processed. +

+ + +RESULTS +} + +# ----------------------------------------------------------- Output date error +sub output_date_error { + my ($r,$message)=@_; + # make query information persistent to allow for subsequent revision + my $persistent=&make_persistent(); + + $r->print(< + +The LearningOnline Network with CAPA +BEGINNING + $r->print(< + + +

Search Catalog

+ $persistent -
-

Search Query

+ +$closebutton +
+

Helpful Message

-Basic search: $ENV{'form.basicexp'} +$message

-

Search Results

-$compiledresult RESULTS - } } -# ------------------------------------------------------------- build_SQL_query -sub build_SQL_query { +# --------- settings whenever the user causes the search window to be launched +sub start_fresh_session { + delete $hash{'mode_catalog'}; + foreach (keys %hash) { + if ($_ =~ /^pre_/) { + delete $hash{$_}; + } + if ($_ =~ /^store/) { + delete $hash{$_}; + } + } +} +# ----------------------------------------------- send javascript to popwin +sub popwin_js { + # Print javascript out to popwin, but make sure we dont generate + # any javascript errors in doing so. + my ($r,$text) = @_; + $r->print(<<"END"); + +END + $r->rflush(); } +sub popwin_imgupdate { + my ($r,$imgnum,$icon) = @_; + &popwin_js($r,'popwin.document.img'.$imgnum.'.'. + 'src="/adm/lonIcons/'.$icon.'";'); +} + 1; + __END__ + +=pod + +=back + +=over 4 + +=head1 HANDLER SUBROUTINE + +This routine is called by Apache and mod_perl. + +=over 4 + +=item * + +configure dynamic components of interface + +=item * + +determine current user + +=item * + +see if a search invocation should be done + +=item * + +else, begin building search interface to output + +=item * + +compute date selection boxes + +=item * + +compute customized metadata field + +=item * + +print screen + +=back + +=head1 OTHER SUBROUTINES + +=over 4 + +=item * + +get_unprocessed_cgi() : reads in critical name/value pairs that may have not +been processed and passed into %ENV by the web server + +=item * + +make_persistent() : makes a set of hidden HTML fields to make +SQL search interface information to be persistent + +=back + +WEB INTERFACE COMPONENT FUNCTIONS + +=over 4 + +=item * + +simpletextfield(name,value) : returns HTML formatted string for simple text +field + +=item * + +simplecheckbox(name,value) : returns HTML formatted string for simple +checkbox + +=item * + +searchphrasefield(title,name,value) : returns HTML formatted string for +a search expression phrase field + +=item * + +dateboxes(name, defaultmonth, defaultday, defaultyear) : returns HTML +formatted string for a calendar date + +=item * + +selectbox(title,name,value,%HASH=options) : returns HTML formatted string for +a selection box field + +=back + +SEARCH FUNCTIONS + +=over 4 + +=item * + +advancedsearch(server reference, environment reference) : perform a complex +multi-field logical query + +=item * + +basicsearch(server reference, environment reference) : perform a simple +single-field logical query + +=item * + +build_SQL_query(field name, logic) : builds a SQL query string from a +logical expression with AND/OR keywords + +=item * + +build_custommetadata_query(field_name, logic_statement) : builds a perl +regular expression from a logical expression with AND/OR keywords + +=item * + +recursive_SQL_query_build(field name, reverse notation expression) : +builds a SQL query string from a reverse notation expression +logical expression with AND/OR keywords + +=item * + +build_date_queries(cmonth1, cday1, cyear1, cmonth2, cday2, cyear2, +lmonth1, lday1, lyear1, lmonth2, lday2, lyear2) : +Builds a SQL logic query to check time/date entries. + +=back + +OUTPUTTING RESULTS FUNCTION + +=over 4 + +=item * + +output_results(output mode, server reference, environment reference, +reply list reference) : outputs results from search + +=back + +DIFFERENT WAYS TO VIEW METADATA RECORDS + +=over 4 + +=item * + +detailed_citation_view(ORDERED METADATA LIST FOR A RESULT OBJECT INSTANCE) : +see metadata viewing notes below + +=item * + +summary_view(ORDERED METADATA LIST FOR A RESULT OBJECT INSTANCE) : +see metadata viewing notes below + +=item * + +fielded_format_view(ORDERED METADATA LIST FOR A RESULT OBJECT INSTANCE) : +see metadata viewing notes below + +=item * + +xml_sgml_view(ORDERED METADATA LIST FOR A RESULT OBJECT INSTANCE) : +see metadata viewing notes below + +=back + + _____________________________________________________________________ + | * Metadata viewing notes | + | Output is a HTML-ified string. | + | Input arguments are title, author, subject, url, keywords, version, | + | notes, short abstract, mime, language, creation date, | + | last revision date, owner, copyright, hostname, httphost, and | + | extra custom metadata to show. | + --------------------------------------------------------------------- + +TEST CONDITIONAL FUNCTIONS + +=over 4 + +=item * + +filled(field) : determines whether a given field has been filled + +=back + +ERROR FUNCTIONS + +=over 4 + +=item * + +output_blank_field_error(server reference) : outputs a message saying that +more fields need to be filled in + +=item * + +output_date_error(server reference, error message) : outputs +an error message specific to bad date format. + +=back + +=cut