--- loncom/interface/lonsearchcat.pm	2001/03/15 19:16:42	1.22
+++ loncom/interface/lonsearchcat.pm	2001/03/20 12:21:56	1.43
@@ -2,7 +2,41 @@
 # Search Catalog
 #
 # 03/08/2001 Scott Harrison
+# Scott Harrison: 03/12/2001, 03/13/2001, 03/14/2001, 03/15/2001, 03/19/2001
+# Scott Harrison: 03/20/2001
 #
+# Functions
+#
+# 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(server reference, environment reference) : perform a complex
+#                                  multi-field logical query
+# filled(field) : determines whether a given field has been filled
+# basicsearch(server reference, environment reference) : perform a simple
+#                               single-field logical query
+# output_blank_field_error(server reference) : outputs a message saying that
+#                                              more fields need to be filled in
+# output_results(output mode,
+#                server reference, 
+#                environment reference,
+#                reply list reference) : outputs results from search
+# 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;
 
 use strict;
@@ -10,6 +44,7 @@ use Apache::Constants qw(:common);
 use Apache::lonnet();
 use Apache::File();
 use CGI qw(:standard);
+use Text::Query;
 
 my %language;
 my $scrout;
@@ -232,12 +267,6 @@ ENDDOCUMENT
 
 # --------------------------------------------------------- Various form fields
 
-sub textfield {
-    my ($title,$name,$value)=@_;
-    return "\n<p><b>$title:</b><br>".
-           '<input type=text name="'.$name.'" size=80 value="'.$value.'">';
-}
-
 sub simpletextfield {
     my ($name,$value)=@_;
     return '<input type=text name="'.$name.'" size=20 value="'.$value.'">';
@@ -424,10 +453,40 @@ sub advancedsearch {
     my ($r,$envhash)=@_;
     my %ENV=%{$envhash};
 
-    return <<(END);
-Advanced searching is not yet implemented.
-END
+    my $fillflag=0;
+    for my $field ('title','author','subject','keywords','url','version',
+		   'notes','abstract','mime','language','owner',
+		   'custommetadata') {
+	if (&filled($ENV{"form.$field"})) {
+	    $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);
+
+    &output_results('Advanced',$r,$envhash,$reply);
+    return OK;
+}
+
+# ---------------------------------------------------- see if a field is filled
+sub filled {
+    my ($field)=@_;
+    if ($field=~/\S/) {
+	return 1;
+    }
+    else {
+	return 0;
+    }
 }
 
 # --------------------------------------------------- Performing a basic search
@@ -435,12 +494,18 @@ sub basicsearch {
     my ($r,$envhash)=@_;
     my %ENV=%{$envhash};
 
-    &output_blank_field_error($r) unless length($ENV{'form.basicexp'});
+    unless (&filled($ENV{'form.basicexp'})) {
+	&output_blank_field_error($r);
+	return OK;
+    }
+
+    my $query='';
+    my $concatarg=join(',"    ",',
+		       ('title', 'author', 'subject', 'notes', 'abstract'));
 
-    my $query=$ENV{'form.basicexp'};
-    $query="select * from metadata where concat(title,\"    \",author) like '\%$ENV{'form.basicexp'}\%'";
+    $query="select * from metadata where concat($concatarg) like '\%$ENV{'form.basicexp'}\%'";
     my $reply=&Apache::lonnet::metadata_query($query);
-    &output_results($r,$envhash,$reply);
+    &output_results('Basic',$r,$envhash,$reply);
     return OK;
 }
 
@@ -490,7 +555,7 @@ RESULTS
 
 # ----------------------------- format and output results based on a reply list
 sub output_results {
-    my ($r,$envhash,@replylist)=@_;
+    my ($mode,$r,$envhash,@replylist)=@_;
     my %ENV=%{$envhash};
     foreach my $reply (@replylist) {
 
@@ -605,9 +670,20 @@ onClick='self.close();'>
 $persistent
 <hr>
 <h3>Search Query</h3>
+RESULTS
+    if ($mode eq 'Basic') {
+	$r->print(<<RESULTS);
 <p>
 <b>Basic search:</b> $ENV{'form.basicexp'}
 </p>
+RESULTS
+    elsif ($mode eq 'Advanced') {
+	$r->print(<<RESULTS);
+<p>
+<b>Advanced search</b>
+</p>
+RESULTS
+    }
 <h3>Search Results</h3>
 $compiledresult
 </body>
@@ -616,5 +692,45 @@ 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');
+    $q->prepare($statement);
+    my $matchexp=${$q}{'matchexp'}; chomp $matchexp;
+    my $sql_query=&recursive_SQL_query_build($field_name,$matchexp);
+}
+
+# - Recursively parse a reverse notation expression into a SQL query expression
+sub recursive_SQL_query_build {
+    my ($dkey,$pattern)=@_;
+    my @matches=($pattern=~/(\[[^\]|\[]*\])/g);
+    return $pattern unless @matches;
+    foreach my $match (@matches) {
+	$match=~/\[ (\w+)\s(.*) \]/;
+	($key,$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);
+}
+
 1;
 __END__