--- loncom/xml/lonxml.pm 2000/06/23 20:40:06 1.2
+++ loncom/xml/lonxml.pm 2000/11/06 16:22:59 1.33
@@ -1,149 +1,378 @@
# The LearningOnline Network with CAPA
-# Style Parser Module
+# XML Parser Module
#
-# last modified 06/23/00 by Alexander Sakharuk
-
-package Apache::lonstyleparser;
+# last modified 06/26/00 by Alexander Sakharuk
+# 11/6 Gerd Kortemeyer
+package Apache::lonxml;
+use vars
+qw(@pwd $outputstack $redirection $textredirection $on_offimport @extlinks);
use strict;
use HTML::TokeParser;
+use Safe;
+use Opcode;
-#============================================================= style subroutine
-
-sub styleparser {
-
- my ($target,$content_style_string) = @_;
+sub register {
+ my $space;
+ my @taglist;
+ my $temptag;
+ ($space,@taglist) = @_;
+ foreach $temptag (@taglist) {
+ $Apache::lonxml::alltags{$temptag}=$space;
+ }
+}
+
+use Apache::style;
+use Apache::lontexconvert;
+use Apache::run;
+use Apache::londefdef;
+use Apache::scripttag;
+#================================================== Main subroutine: xmlparse
+@pwd=();
+$outputstack = '';
+$redirection = 1;
+$textredirection = 1;
+$on_offimport = 0;
+@extlinks=();
+
+sub xmlparse {
+
+ my ($target,$content_file_string,$safeinit,%style_for_target) = @_;
+ if ($target eq 'meta')
+ {$Apache::lonxml::textredirection = 0;
+ $Apache::lonxml::on_offimport = 1;
+ }
+ my @pars = ();
+ @Apache::lonxml::pwd=();
+ my $pwd=$ENV{'request.filename'};
+ $pwd =~ s:/[^/]*$::;
+ &newparser(\@pars,\$content_file_string,$pwd);
+ my $currentstring = '';
+ my $finaloutput = '';
+ my $newarg = '';
+ my $result;
+
+ my $safeeval = new Safe;
+ $safeeval->permit("entereval");
+ $safeeval->permit(":base_math");
+ $safeeval->deny(":base_io");
+#need to inspect this class of ops
+# $safeeval->deny(":base_orig");
+ $safeinit .= ';$external::target='.$target.';';
+ $safeinit .= ';$external::randomseed='.&Apache::lonnet::rndseed().';';
+ &Apache::run::run($safeinit,$safeeval);
+#-------------------- Redefinition of the target in the case of compound target
+
+ ($target, my @tenta) = split('&&',$target);
+
+ my @stack = ();
+ my @parstack = ();
+ &initdepth;
+ my $token;
+ while ( $#pars > -1 ) {
+ while ($token = $pars[$#pars]->get_token) {
+ if ($token->[0] eq 'T') {
+ if ($Apache::lonxml::textredirection == 1) {$result=$token->[1];}
+# $finaloutput .= &Apache::run::evaluate($token->[1],$safeeval,'');
+ } elsif ($token->[0] eq 'S') {
+# if ($target eq 'meta' and $token->[2]->{metaout} eq 'ON') {$Apache::lonxml::textredirection = 1;}
+ # add tag to stack
+ push (@stack,$token->[1]);
+ # add parameters list to another stack
+ push (@parstack,&parstring($token));
+ &increasedepth($token);
+ if (exists $style_for_target{$token->[1]}) {
+
+ if ($Apache::lonxml::redirection == 1) {
+ $finaloutput .= &recurse($style_for_target{$token->[1]},
+ $target,$safeeval,\%style_for_target,
+ @parstack);
+ } else {
+ $Apache::lonxml::outputstack .= &recurse($style_for_target{$token->[1]},
+ $target,$safeeval,\%style_for_target,
+ @parstack);
+ }
-#------------------------------------------- target redefinition (if necessary)
-
- my @target_string = '';
- my $element;
-
- ($element,@target_string) = split ('&&',$target);
-
- map {$content_style_string =~ s/\<(.*)$_\>/\<$1$element\>/g; } @target_string;
-
- $target = $element;
-
-#-------------------------------------------- create a table for defined target
-#----------------------------------------- from the information from Style File
-
- my @value_style = ();
- my $current_key = '';
- my $current_value = '';
- my $stoken;
- my $flag;
- my $iele;
-
- my $pstyle = HTML::TokeParser->new(\$content_style_string);
-
- while ($stoken = $pstyle->get_token) {
-#----------------------------------------------------- start for tag definition
- if ($stoken->[0] eq 'S' and $stoken->[1] eq 'definetag') {
-#-------------------------------------------------------------- new key in hash
- $current_key = $stoken->[2]{name};
- $flag = 0;
-#-------------------------------------------------------------- metadata output
- if ($target eq 'meta') {
- while ($stoken = $pstyle->get_token and $stoken->[1] ne 'definetag') {
- if ($stoken->[0] eq 'S' and $stoken->[1] eq 'meta') {
- while ($stoken = $pstyle->get_token and $stoken->[1] ne 'meta') {
- $current_value .= $stoken->[1];
+ } else {
+ $result = &callsub("start_$token->[1]", $target, $token,\@parstack,
+ \@pars, $safeeval, \%style_for_target);
+ }
+ } elsif ($token->[0] eq 'E') {
+# if ($target eq 'meta') {$Apache::lonxml::textredirection = 0;}
+ #clear out any tags that didn't end
+ while ($token->[1] ne $stack[$#stack]
+ && ($#stack > -1)) {pop @stack;pop @parstack;&decreasedepth($token);}
+
+ if (exists $style_for_target{'/'."$token->[1]"}) {
+
+ if ($Apache::lonxml::redirection == 1) {
+ $finaloutput .= &recurse($style_for_target{'/'."$token->[1]"},
+ $target,$safeeval,\%style_for_target,
+ @parstack);
+ } else {
+ $Apache::lonxml::outputstack .= &recurse($style_for_target{'/'."$token->[1]"},
+ $target,$safeeval,\%style_for_target,
+ @parstack);
}
+
+ } else {
+ $result = &callsub("end_$token->[1]", $target, $token, \@parstack,
+ \@pars,$safeeval, \%style_for_target);
}
}
- } else {
-#--------------------------------------------------------------- outtext output
- while ($stoken = $pstyle->get_token and $stoken->[1] ne 'outtext') {
- if ($stoken->[1] eq 'definetag') {
- $flag = 1;
- last;
- }
- }
- if ($flag == 0) {
- while ($stoken = $pstyle->get_token and $stoken->[0] ne 'S') {
- $current_value .= $stoken->[1];
- }
- while ($stoken->[1] ne 'definetag') {
- if ($stoken->[0] eq 'S' and $stoken->[1] eq $target) {
- while ($stoken = $pstyle->get_token) {
- if ($stoken->[1] ne $target) {
- if ($stoken->[0] eq 'S') {
- my $flagelem = 0;
- for (my $i=$#value_style-1;$i>0;$i=$i-2) {
- if ($stoken->[1] eq $value_style[$i]) {
- $flagelem = 1;
- $iele = $i+1;
- last;
- }
- }
- if ($flagelem == 0) {
- $current_value .= $stoken->[4];
- } else {
- $current_value .= $value_style[$iele];
- }
- }
- if ($stoken->[0] eq 'E') {
- my $flagelem = 0;
- for (my $i=$#value_style-1;$i>0;$i=$i-2) {
- if ('/'.$stoken->[1] eq $value_style[$i]) {
- $flagelem = 1;
- $iele = $i+1;
- last;
- }
- }
- if ($flagelem == 0) {
- $current_value .= $stoken->[2];
- } else {
- $current_value .= $value_style[$iele];
- }
- }
- if ($stoken->[0] eq 'T') {
- $current_value .= $stoken->[1];
- }
- } else {
- last;
- }
+ if ($result ne "") {
+ if ( $#parstack > -1 ) {
+
+ if ($Apache::lonxml::redirection == 1) {
+ $finaloutput .= &Apache::run::evaluate($result,$safeeval,
+ $parstack[$#parstack]);
+ } else {
+ $Apache::lonxml::outputstack .= &Apache::run::evaluate($result,$safeeval,
+ $parstack[$#parstack]);
}
- } elsif ($stoken->[0] eq 'S' and $stoken->[1] ne $target) {
- my $tempotempo = $stoken->[1];
- while ($stoken = $pstyle->get_token and $stoken->[1] ne $tempotempo) {
- }
+
+ } else {
+ $finaloutput .= &Apache::run::evaluate($result,$safeeval,'');
}
+ $result = '';
+ } else {
+ $finaloutput .= $result;
+ }
+ if ($token->[0] eq 'E') { pop @stack;pop @parstack;&decreasedepth($token);}
+ }
+ pop @pars;
+ pop @Apache::lonxml::pwd;
+ }
- while ($stoken = $pstyle->get_token) {
- if ($stoken->[0] eq 'T') {
- $current_value .= $stoken->[1];
- }
- if ($stoken->[0] eq 'E') {
- last;
- }
- if ($stoken->[0] eq 'S') {
- last;
+ return $finaloutput;
+}
+
+sub recurse {
+
+ my @innerstack = ();
+ my @innerparstack = ();
+ my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_;
+ my @pat = ();
+ &newparser(\@pat,\$newarg);
+ my $tokenpat;
+ my $partstring = '';
+ my $output='';
+ my $decls='';
+ while ( $#pat > -1 ) {
+ while ($tokenpat = $pat[$#pat]->get_token) {
+ if ($tokenpat->[0] eq 'T') {
+ if ($Apache::lonxml::textredirection == 1) {$partstring = $tokenpat->[1];}
+ } elsif ($tokenpat->[0] eq 'S') {
+ push (@innerstack,$tokenpat->[1]);
+ push (@innerparstack,&parstring($tokenpat));
+ &increasedepth($tokenpat);
+ $partstring = &callsub("start_$tokenpat->[1]",
+ $target, $tokenpat, \@innerparstack,
+ \@pat, $safeeval, $style_for_target);
+ } elsif ($tokenpat->[0] eq 'E') {
+ #clear out any tags that didn't end
+ while ($tokenpat->[1] ne $innerstack[$#innerstack]
+ && ($#innerstack > -1)) {pop @innerstack;pop @innerparstack;
+ &decreasedepth($tokenpat);}
+ $partstring = &callsub("end_$tokenpat->[1]",
+ $target, $tokenpat, \@innerparstack,
+ \@pat, $safeeval, $style_for_target);
+ }
+ #pass both the variable to the style tag, and the tag we
+ #are processing inside the <definedtag>
+ if ( $partstring ne "" ) {
+ if ( $#parstack > -1 ) {
+ if ( $#innerparstack > -1 ) {
+ $decls= $parstack[$#parstack].$innerparstack[$#innerparstack];
+ } else {
+ $decls= $parstack[$#parstack];
+ }
+ } else {
+ if ( $#innerparstack > -1 ) {
+ $decls=$innerparstack[$#innerparstack];
+ } else {
+ $decls='';
+ }
}
- }
-
+ $output .= &Apache::run::evaluate($partstring,$safeeval,$decls);
+ $partstring = '';
}
- }
+ if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack;
+ &decreasedepth($tokenpat);}
}
-
- }
- $current_value =~ s/(\s)+/$1/g;
- if ($current_value ne ' ' and $current_value ne '' ) {
- push (@value_style,lc $current_key,$current_value);
- }
- $current_key = '';
- $current_value = '';
+ pop @pat;
+ pop @Apache::lonxml::pwd;
+ }
+ return $output;
+}
+
+sub callsub {
+ my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_;
+ my $currentstring='';
+ {
+ my $sub1;
+ no strict 'refs';
+ if (my $space=$Apache::lonxml::alltags{$token->[1]}) {
+ #&Apache::lonxml::debug("Calling sub $sub in $space<br>\n");
+ $sub1="$space\:\:$sub";
+ $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
+ $currentstring = &$sub1($target,$token,$parstack,$parser,
+ $safeeval,$style);
+ } else {
+ #&Apache::lonxml::debug("NOT Calling sub $sub in $space<br>\n");
+ if (defined($token->[4])) {
+ $currentstring = $token->[4];
+ } else {
+ $currentstring = $token->[2];
+ }
+ }
+ use strict 'refs';
+ }
+ return $currentstring;
+}
+
+sub initdepth {
+ @Apache::lonxml::depthcounter=();
+ $Apache::lonxml::depth=-1;
+ $Apache::lonxml::olddepth=-1;
+}
+
+sub increasedepth {
+ my ($token) = @_;
+ if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) {
+ $#Apache::lonxml::depthcounter--;
+ $Apache::lonxml::olddepth=$Apache::lonxml::depth;
+ }
+ $Apache::lonxml::depth++;
+# print "<br>s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1]<br>\n";
+ $Apache::lonxml::depthcounter[$Apache::lonxml::depth]++;
+ if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) {
+ $Apache::lonxml::olddepth=$Apache::lonxml::depth;
+ }
+}
+
+sub decreasedepth {
+ my ($token) = @_;
+ $Apache::lonxml::depth--;
+# print "<br>e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1]<br>\n";
+}
+
+sub get_all_text {
- }
- my %style_for_target = @value_style;
-#--------------------------------------------------------------- check printing
-# while (($current_key,$current_value) = each %style_for_target) {
-# print "$current_key => $current_value\n";
-# }
-#---------------------------------------------------------------- return result
- return %style_for_target;
+ my($tag,$pars)= @_;
+ my $depth=0;
+ my $token;
+ my $result='';
+ my $tag=substr($tag,1); #strip the / off the tag
+# &Apache::lonxml::debug("have:$tag:");
+ while (($depth >=0) && ($token = $pars->get_token)) {
+ if ($token->[0] eq 'T') {
+ $result.=$token->[1];
+ } elsif ($token->[0] eq 'S') {
+ if ($token->[1] eq $tag) { $depth++; }
+ $result.=$token->[4];
+ } elsif ($token->[0] eq 'E') {
+ if ( $token->[1] eq $tag) { $depth--; }
+ #skip sending back the last end tag
+ if ($depth > -1) { $result.=$token->[2]; }
+ }
+ }
+ return $result
+}
+
+sub newparser {
+ my ($parser,$contentref,$dir) = @_;
+ push (@$parser,HTML::TokeParser->new($contentref));
+ if ( $dir eq '' ) {
+ push (@Apache::lonxml::pwd, $Apache::lonxml::pwd[$#Apache::lonxml::pwd]);
+ } else {
+ push (@Apache::lonxml::pwd, $dir);
+ }
+# &Apache::lonxml::debug("pwd:$#Apache::lonxml::pwd");
+# &Apache::lonxml::debug("pwd:$Apache::lonxml::pwd[$#Apache::lonxml::pwd]");
+}
+
+sub parstring {
+ my ($token) = @_;
+ my $temp='';
+ map {
+ if ($_=~/\w+/) {
+ $temp .= "my \$$_=\"$token->[2]->{$_}\";"
+ }
+ } @{$token->[3]};
+ return $temp;
+}
+
+sub handler {
+ my $request=shift;
+
+ my $target='web';
+ $Apache::lonxml::debug=1;
+ if ($ENV{'browser.mathml'}) {
+ $request->content_type('text/xml');
+ } else {
+ $request->content_type('text/html');
+ }
+
+# $request->print(<<ENDHEADER);
+#<html>
+#<head>
+#<title>Just test</title>
+#</head>
+#<body bgcolor="#FFFFFF">
+#ENDHEADER
+# &Apache::lonhomework::send_header($request);
+ $request->send_http_header;
+
+ return 'OK' if $request->header_only;
+
+ $request->print(&Apache::lontexconvert::header());
+
+ $request->print('<body bgcolor="#FFFFFF">'."\n");
+
+ my $file = "/home/httpd/html".$request->uri;
+ my %mystyle;
+ my $result = '';
+ $result = Apache::lonxml::xmlparse($target, &Apache::lonnet::getfile($file),'',%mystyle);
+ $request->print($result);
+
+ $request->print('</body>');
+ $request->print(&Apache::lontexconvert::footer());
+ return 'OK';
+}
+
+$Apache::lonxml::debug=0;
+sub debug {
+ if ($Apache::lonxml::debug eq 1) {
+ print "DEBUG:".$_[0]."<br>\n";
+ }
+}
+sub error {
+ print "ERROR:".$_[0]."<br>\n";
+}
+sub warning {
+ if ($Apache::lonxml::debug eq 1) {
+ print "WARNING:".$_[0]."<br>\n";
+ }
}
1;
__END__
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