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# The LearningOnline Network with CAPA # XML Parser Module # # last modified 06/26/00 by Alexander Sakharuk # 11/6 Gerd Kortemeyer # 6/1/1 Gerd Kortemeyer # 2/21,3/13 Guy # 3/29,5/4 Gerd Kortemeyer # 5/10 Scott Harrison package Apache::lonxml; use vars qw(@pwd @outputstack $redirection $import @extlinks $metamode $evaluate %insertlist @namespace); use strict; use HTML::TokeParser; use Safe; use Safe::Hole; use Opcode; sub register { my $space; my @taglist; my $temptag; ($space,@taglist) = @_; foreach $temptag (@taglist) { $Apache::lonxml::alltags{$temptag}=$space; } } use Apache::Constants qw(:common); use Apache::lontexconvert; use Apache::style; use Apache::run; use Apache::londefdef; use Apache::scripttag; use Apache::edit; #================================================== Main subroutine: xmlparse #debugging control, to turn on debugging modify the correct handler $Apache::lonxml::debug=0; #path to the directory containing the file currently being processed @pwd=(); #these two are used for capturing a subset of the output for later processing, #don't touch them directly use &startredirection and &endredirection @outputstack = (); $redirection = 0; #controls wheter the tag actually does $import = 1; @extlinks=(); # meta mode is a bit weird only some output is to be turned off # tag turns metamode off (defined in londefdef.pm) $metamode = 0; # turns on and of run::evaluate actually derefencing var refs $evaluate = 1; # data structure for eidt mode, determines what tags can go into what other tags %insertlist=(); #stores the list of active tag namespaces @namespace=(); sub xmlbegin { my $output=''; if ($ENV{'browser.mathml'}) { $output='' .'' .']>' .''; } else { $output=''; } return $output; } sub xmlend { return ''; } sub fontsettings() { my $headerstring=''; if (($ENV{'browser.os'} eq 'mac') && (!$ENV{'browser.mathml'})) { $headerstring.= ''; } return $headerstring; } sub registerurl { return (< // BEGIN LON-CAPA Internal function LONCAPAreg() { if (window.location.pathname!="/res/adm/pages/menu.html") { menu=window.open("","LONCAPAmenu"); menu.currentURL=window.location.pathname; menu.currentStale=0; } } function LONCAPAstale() { if (window.location.pathname!="/res/adm/pages/menu.html") { menu=window.open("","LONCAPAmenu"); menu.currentStale=1; } } // END LON-CAPA Internal ENDSCRIPT } sub loadevents() { return 'LONCAPAreg();'; } sub unloadevents() { return 'LONCAPAstale();'; } sub printalltags { my $temp; foreach $temp (sort keys %Apache::lonxml::alltags) { &Apache::lonxml::debug("$temp -- $Apache::lonxml::alltags{$temp}"); } } sub xmlparse { my ($target,$content_file_string,$safeinit,%style_for_target) = @_; if ($target eq 'meta') { $Apache::lonxml::redirection = 0; $Apache::lonxml::metamode = 1; $Apache::lonxml::evaluate = 1; $Apache::lonxml::import = 0; } elsif ($target eq 'grade') { &startredirection; $Apache::lonxml::metamode = 0; $Apache::lonxml::evaluate = 1; $Apache::lonxml::import = 1; } elsif ($target eq 'modified') { $Apache::lonxml::redirection = 0; $Apache::lonxml::metamode = 0; $Apache::lonxml::evaluate = 0; $Apache::lonxml::import = 0; } else { $Apache::lonxml::redirection = 0; $Apache::lonxml::metamode = 0; $Apache::lonxml::evaluate = 1; $Apache::lonxml::import = 1; } #&printalltags(); 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; my $safehole = new Safe::Hole; $safeeval->permit("entereval"); $safeeval->permit(":base_math"); $safeeval->deny(":base_io"); $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT'); #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 (($token->[0] eq 'T') || ($token->[0] eq 'C') || ($token->[0] eq 'D') ) { if ($metamode<1) { $result=$token->[1]; } } elsif ($token->[0] eq 'PI') { if ($metamode<1) { $result=$token->[2]; } } elsif ($token->[0] eq 'S') { # add tag to stack push (@stack,$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) { $Apache::lonxml::outputstack['-1'] .= &recurse($style_for_target{$token->[1]},$target,$safeeval, \%style_for_target,@parstack); } else { $finaloutput .= &recurse($style_for_target{$token->[1]},$target, $safeeval,\%style_for_target,@parstack); } } else { $result = &callsub("start_$token->[1]", $target, $token,\@parstack, \@pars, $safeeval, \%style_for_target); } } elsif ($token->[0] eq 'E') { #clear out any tags that didn't end while ($token->[1] ne $stack[$#stack] && ($#stack > -1)) { &Apache::lonxml::warning("Unbalanced tags in resource $stack['-1']"); pop @stack;pop @parstack;&decreasedepth($token); } if (exists $style_for_target{'/'."$token->[1]"}) { if ($Apache::lonxml::redirection) { $Apache::lonxml::outputstack['-1'] .= &recurse($style_for_target{'/'."$token->[1]"}, $target,$safeeval,\%style_for_target,@parstack); } else { $finaloutput .= &recurse($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 { &Apache::lonxml::error("Unknown token event :$token->[0]:$token->[1]:"); } #evaluate variable refs in result if ($result ne "") { if ( $#parstack > -1 ) { if ($Apache::lonxml::redirection) { $Apache::lonxml::outputstack['-1'] .= &Apache::run::evaluate($result,$safeeval,$parstack[$#parstack]); } else { $finaloutput .= &Apache::run::evaluate($result,$safeeval, $parstack[$#parstack]); } } else { $finaloutput .= &Apache::run::evaluate($result,$safeeval,''); } $result = ''; } if ($token->[0] eq 'E') { pop @stack;pop @parstack;&decreasedepth($token); } } pop @pars; pop @Apache::lonxml::pwd; } # if ($target eq 'meta') { # $finaloutput.=&endredirection; # } if (($ENV{'QUERY_STRING'}) && ($target eq 'web')) { $finaloutput=&afterburn($finaloutput); } 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 (($tokenpat->[0] eq 'T') || ($tokenpat->[0] eq 'C') || ($tokenpat->[0] eq 'D') ) { if ($metamode<1) { $partstring=$tokenpat->[1]; } } elsif ($tokenpat->[0] eq 'PI') { if ($metamode<1) { $partstring=$tokenpat->[2]; } } 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)) { &Apache::lonxml::warning("Unbalanced tags in resource $innerstack['-1']"); pop @innerstack;pop @innerparstack;&decreasedepth($tokenpat); } $partstring = &callsub("end_$tokenpat->[1]", $target, $tokenpat, \@innerparstack, \@pat, $safeeval, $style_for_target); } else { &Apache::lonxml::error("Unknown token event :$tokenpat->[0]:$tokenpat->[1]:"); } #pass both the variable to the style tag, and the tag we #are processing inside the 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);} } pop @pat; pop @Apache::lonxml::pwd; } return $output; } sub callsub { my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_; my $currentstring=''; my $nodefault; { my $sub1; no strict 'refs'; if ($target eq 'edit' && $token->[0] eq 'S') { $currentstring = &Apache::edit::tag_start($target,$token,$parstack,$parser, $safeeval,$style); } my $tag=$token->[1]; my $space=$Apache::lonxml::alltags{$tag}; if (!$space) { $tag=~tr/A-Z/a-z/; $sub=~tr/A-Z/a-z/; $space=$Apache::lonxml::alltags{$tag} } if ($space) { #&Apache::lonxml::debug("Calling sub $sub in $space $metamode
\n"); $sub1="$space\:\:$sub"; $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter); ($currentstring,$nodefault) = &$sub1($target,$token,$parstack,$parser, $safeeval,$style); } else { #&Apache::lonxml::debug("NOT Calling sub $sub in $space $metamode
\n"); if ($metamode <1) { if (defined($token->[4]) && ($metamode < 1)) { $currentstring = $token->[4]; } else { $currentstring = $token->[2]; } } } &Apache::lonxml::debug("nodefalt:$nodefault:"); if ($currentstring eq '' && $nodefault eq '') { if ($target eq 'edit') { &Apache::lonxml::debug("doing default edit for $token->[1]"); if ($token->[0] eq 'S') { $currentstring = &Apache::edit::tag_start($target,$token); } elsif ($token->[0] eq 'E') { $currentstring = &Apache::edit::tag_end($target,$token); } } elsif ($target eq 'modified') { if ($token->[0] eq 'S') { $currentstring = $token->[4]; $currentstring.=&Apache::edit::handle_insert(); } else { $currentstring = $token->[2]; } } } use strict 'refs'; } return $currentstring; } sub startredirection { $Apache::lonxml::redirection++; push (@Apache::lonxml::outputstack, ''); } sub endredirection { if (!$Apache::lonxml::redirection) { &Apache::lonxml::error("Endredirection was called, before a startredirection, perhaps you have unbalanced tags. Some debuging information:".join ":",caller); return ''; } $Apache::lonxml::redirection--; pop @Apache::lonxml::outputstack; } sub initdepth { @Apache::lonxml::depthcounter=(); $Apache::lonxml::depth=-1; $Apache::lonxml::olddepth=-1; } sub increasedepth { my ($token) = @_; $Apache::lonxml::depth++; $Apache::lonxml::depthcounter[$Apache::lonxml::depth]++; if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) { $Apache::lonxml::olddepth=$Apache::lonxml::depth; } my $curdepth=join('_',@Apache::lonxml::depthcounter); &Apache::lonxml::debug("s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n"); #print "
s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n"; } sub decreasedepth { my ($token) = @_; $Apache::lonxml::depth--; if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) { $#Apache::lonxml::depthcounter--; $Apache::lonxml::olddepth=$Apache::lonxml::depth+1; } if ( $Apache::lonxml::depth < -1) { &Apache::lonxml::warning("Unbalanced tags in resource"); $Apache::lonxml::depth='-1'; } my $curdepth=join('_',@Apache::lonxml::depthcounter); &Apache::lonxml::debug("e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n"); #print "
e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n"; } sub get_all_text { my($tag,$pars)= @_; my $depth=0; my $token; my $result=''; if ( $tag =~ m:^/: ) { my $tag=substr($tag,1); # &Apache::lonxml::debug("have:$tag:"); while (($depth >=0) && ($token = $pars->get_token)) { # &Apache::lonxml::debug("e token:$token->[0]:$depth:$token->[1]"); if (($token->[0] eq 'T')||($token->[0] eq 'C')||($token->[0] eq 'D')) { $result.=$token->[1]; } elsif ($token->[0] eq 'PI') { $result.=$token->[2]; } 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]; } else { $pars->unget_token($token); } } } } else { while ($token = $pars->get_token) { # &Apache::lonxml::debug("s token:$token->[0]:$depth:$token->[1]"); if (($token->[0] eq 'T')||($token->[0] eq 'C')||($token->[0] eq 'D')) { $result.=$token->[1]; } elsif ($token->[0] eq 'PI') { $result.=$token->[2]; } elsif ($token->[0] eq 'S') { if ( $token->[1] eq $tag) { $pars->unget_token($token); last; } else { $result.=$token->[4]; } } elsif ($token->[0] eq 'E') { $result.=$token->[2]; } } } # &Apache::lonxml::debug("Exit:$result:"); return $result } sub newparser { my ($parser,$contentref,$dir) = @_; push (@$parser,HTML::TokeParser->new($contentref)); $$parser['-1']->xml_mode('1'); 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 $temp=''; map { unless ($_=~/\W/) { my $val=$token->[2]->{$_}; $val =~ s/([\%\@\\])/\\$1/g; #if ($val =~ m/^[\%\@]/) { $val="\\".$val; } $temp .= "my \$$_=\"$val\";" } } @{$token->[3]}; return $temp; } sub writeallows { my $thisurl='/res/'.&Apache::lonnet::declutter(shift); my $thisdir=$thisurl; $thisdir=~s/\/[^\/]+$//; my %httpref=(); map { $httpref{'httpref.'. &Apache::lonnet::hreflocation($thisdir,$_)}=$thisurl; } @extlinks; &Apache::lonnet::appenv(%httpref); } # # Afterburner handles anchors, highlights and links # sub afterburn { my $result=shift; map { my ($name, $value) = split(/=/,$_); $value =~ tr/+/ /; $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg; if (($name eq 'highlight')||($name eq 'anchor')||($name eq 'link')) { unless ($ENV{'form.'.$name}) { $ENV{'form.'.$name}=$value; } } } (split(/&/,$ENV{'QUERY_STRING'})); if ($ENV{'form.highlight'}) { map { my $anchorname=$_; my $matchthis=$anchorname; $matchthis=~s/\_+/\\s\+/g; $result=~s/($matchthis)/\$1\<\/font\>/gs; } split(/\,/,$ENV{'form.highlight'}); } if ($ENV{'form.link'}) { map { my ($anchorname,$linkurl)=split(/\>/,$_); my $matchthis=$anchorname; $matchthis=~s/\_+/\\s\+/g; $result=~s/($matchthis)/\$1\<\/a\>/gs; } split(/\,/,$ENV{'form.link'}); } if ($ENV{'form.anchor'}) { my $anchorname=$ENV{'form.anchor'}; my $matchthis=$anchorname; $matchthis=~s/\_+/\\s\+/g; $result=~s/($matchthis)/\$1\<\/a\>/s; $result.=(<<"ENDSCRIPT"); ENDSCRIPT } return $result; } sub handler { my $request=shift; my $target='web'; $Apache::lonxml::debug=0; if ($ENV{'browser.mathml'}) { $request->content_type('text/xml'); } else { $request->content_type('text/html'); } # $request->print(< # #Just test # # #ENDHEADER # &Apache::lonhomework::send_header($request); $request->send_http_header; return OK if $request->header_only; my $file=&Apache::lonnet::filelocation("",$request->uri); my %mystyle; my $result = ''; my $filecontents=&Apache::lonnet::getfile($file); if ($filecontents == -1) { &Apache::lonxml::error(" Unable to find $file"); $filecontents=''; } else { $result = &Apache::lonxml::xmlparse($target,$filecontents,'',%mystyle); } $request->print($result); writeallows($request->uri); return OK; } sub debug { if ($Apache::lonxml::debug eq 1) { print "DEBUG:".$_[0]."
\n"; } } sub error { if (($Apache::lonxml::debug eq 1) || ($ENV{'request.state'} eq 'construct') ) { print "ERROR:".$_[0]."
\n"; } else { print "An Error occured while processing this resource. The instructor has been notified.
"; #notify author &Apache::lonmsg::author_res_msg($ENV{'request.filename'},$_[0]); #notify course if ( $ENV{'request.course.id'} ) { my $users=$ENV{'course.'.$ENV{'request.course.id'}.'.comment.email'}; foreach my $user (split /\,/, $users) { ($user,my $domain) = split /:/, $user; &Apache::lonmsg::user_normal_msg($user,$domain,"Error in $ENV{'request.filename'}",$_[0]); } } #FIXME probably shouldn't have me get everything forever. &Apache::lonmsg::user_normal_msg('albertel','msu',"Error in $ENV{'request.filename'}",$_[0]); #&Apache::lonmsg::user_normal_msg('albertel','103',"Error in $ENV{'request.filename'}",$_[0]); } } sub warning { if ($ENV{'request.state'} eq 'construct') { print "WARNING:".$_[0]."
\n"; } } sub register_insert { my @data = split /\n/, &Apache::lonnet::getfile('/home/httpd/lonTabs/insertlist.tab'); my $i; my $tagnum=0; my @order; for ($i=0;$i < $#data; $i++) { my $line = $data[$i]; if ( $line =~ /^\#/ || $line =~ /^\s*\n/) { next; } if ( $line =~ /TABLE/ ) { last; } my ($tag,$descrip,$function,$show) = split(/,/, $line); $insertlist{"$tagnum.tag"} = $tag; $insertlist{"$tagnum.description"} = $descrip; $insertlist{"$tagnum.function"} = $function; $insertlist{"$tagnum.show"}= $show; $tagnum++; } $i++; #skipping TABLE line $tagnum = 0; for (;$i < $#data;$i++) { my $line = $data[$i]; my ($mnemonic,@which) = split(/ +/,$line); my $tag = $insertlist{"$tagnum.tag"}; for (my $j=0;$j <$#which;$j++) { if ( $which[$j] eq 'Y' ) { if ($insertlist{"$j.show"} ne 'no') { push(@{ $insertlist{"$tag.which"} },$j); } } } $tagnum++; } } 1; __END__