--- loncom/interface/lonsearchcat.pm 2001/03/20 11:45:21 1.42 +++ loncom/interface/lonsearchcat.pm 2001/03/21 02:09:38 1.50 @@ -31,8 +31,11 @@ # server reference, # environment reference, # reply list reference) : outputs results from search -# build_SQL_query() : builds a SQL query string from a logical expression -# with AND/OR keywords +# build_SQL_query(field name, logic) : builds a SQL query string from a +# logical expression with AND/OR keywords +# 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 package Apache::lonsearchcat; @@ -48,6 +51,15 @@ my $scrout; my %metadatafields; my %cprtag; my %mimetag; +my $closebutton; +my $viewselect=< + + + + + +END sub handler { my $r = shift; @@ -73,6 +85,10 @@ sub handler { END + $closebutton=< +END + # ------------------------------------------------ First, check out environment $metadatafields{'owner'}=$ENV{'user.name'}.'@'.$ENV{'user.domain'}; @@ -245,7 +261,8 @@ ENDDOCUMENT
- +$closebutton +$viewselect

Advanced Search

@@ -253,7 +270,8 @@ $scrout

- +$closebutton +$viewselect

@@ -445,7 +463,7 @@ sub selectbox { return $selout.''; } -# ------------------------------------------------ Performing a advanced search +# ----------------------------------------------- Performing an advanced search sub advancedsearch { my ($r,$envhash)=@_; my %ENV=%{$envhash}; @@ -465,13 +483,23 @@ sub advancedsearch { } 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); - &output_results($r,$envhash,$reply); + my @queries; + # Go through logical expression AND/OR/NOT phrase fields. + foreach my $field ('title','author','subject','notes','abstract') { + if ($ENV{'form.'.$field}) { + push @queries,&build_SQL_query($field,$ENV{'form.'.$field}); + } + } + if (@queries) { + $query=join(" and ",@queries); + $query="select * from metadata where $query"; + my $reply=&Apache::lonnet::metadata_query($query); + &output_results('Advanced',$r,$envhash,$query,$reply); + } + else { + &output_results('Advanced',$r,$envhash,$query); + } return OK; } @@ -502,10 +530,11 @@ sub basicsearch { $query="select * from metadata where concat($concatarg) like '\%$ENV{'form.basicexp'}\%'"; my $reply=&Apache::lonnet::metadata_query($query); - &output_results($r,$envhash,$reply); + &output_results('Basic',$r,$envhash,$query,$reply); return OK; } +# ---------------- Message to output when there are not enough fields filled in sub output_blank_field_error { my ($r)=@_; # make query information persistent to allow for subsequent revision @@ -535,8 +564,7 @@ BEGINNING $persistent - +$closebutton

Helpful Message

@@ -552,8 +580,10 @@ RESULTS # ----------------------------- format and output results based on a reply list sub output_results { - my ($r,$envhash,@replylist)=@_; + my ($mode,$r,$envhash,$query,@replylist)=@_; my %ENV=%{$envhash}; + my $compiledresult=''; + foreach my $reply (@replylist) { my @results; @@ -576,13 +606,13 @@ sub output_results { @results=<$fh>; } - my $compiledresult=''; - foreach my $result (@results) { + my @fields=map + {&Apache::lonnet::unescape($_)} + (split(/\,/,$result)); my ($title,$author,$subject,$url,$keywords,$version, $notes,$abstract,$mime,$lang, - $creationdate,$lastrevisiondate,$owner,$copyright - )=map {&Apache::lonnet::unescape($_)} (split(/\,/,$result)); + $creationdate,$lastrevisiondate,$owner,$copyright)=@fields; my $shortabstract=$abstract; $shortabstract=substr($abstract,0,200) if length($abstract)>200; $compiledresult.=<$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 -

-END + + if ($ENV{'form.viewselect'} eq 'Detailed Citation View') { + $compiledresult.=&detailed_citation_view(@fields); + } + elsif ($ENV{'form.viewselect'} eq 'Summary View') { + $compiledresult.=&summary_view(@fields); + } + elsif ($ENV{'form.viewselect'} eq 'Fielded Format') { + $compiledresult.=&fielded_format_view(@fields); + } + elsif ($ENV{'form.viewselect'} eq 'XML/SGML') { + $compiledresult.=&xml_sgml_view(@fields); + } + } unless ($compiledresult) { @@ -662,14 +688,27 @@ SCRIPT
- +$closebutton $persistent

Search Query

+RESULTS + if ($mode eq 'Basic') { + $r->print(< Basic search: $ENV{'form.basicexp'}

+RESULTS + } + elsif ($mode eq 'Advanced') { + $r->print(< +Advanced search +$query +

+RESULTS + } + $r->print(<Search Results $compiledresult @@ -680,7 +719,147 @@ RESULTS # ------------------------------------------------------------- build_SQL_query sub build_SQL_query { + my ($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 $sql_query; +} + +# - Recursively parse a reverse notation expression into a SQL query expression +sub recursive_SQL_query_build { + my ($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 '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,$pattern); +} +# ------------------------------------------------------ Detailed Citation View +sub detailed_citation_view { + my ($title,$author,$subject,$url,$keywords,$version, + $notes,$abstract,$mime,$lang, + $creationdate,$lastrevisiondate,$owner,$copyright)=@_; + my $result=<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 +

+END + return $result; +} + +# ---------------------------------------------------------------- Summary View +sub summary_view { + my ($title,$author,$subject,$url,$keywords,$version, + $notes,$abstract,$mime,$lang, + $creationdate,$lastrevisiondate,$owner,$copyright)=@_; + my $result=<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 +

+END + return $result; +} + +# -------------------------------------------------------------- Fielded Format +sub fielded_format_view { + my ($title,$author,$subject,$url,$keywords,$version, + $notes,$abstract,$mime,$lang, + $creationdate,$lastrevisiondate,$owner,$copyright)=@_; + my $result=<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 +

+END + return $result; +} + +# -------------------------------------------------------------------- XML/SGML +sub xml_sgml_view { + my ($title,$author,$subject,$url,$keywords,$version, + $notes,$abstract,$mime,$lang, + $creationdate,$lastrevisiondate,$owner,$copyright)=@_; + my $result=<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 +

+END + return $result; } 1;