--- loncom/xml/lonxml.pm 2000/06/23 20:40:06 1.2 +++ loncom/xml/lonxml.pm 2001/05/04 17:33:35 1.70 @@ -1,149 +1,607 @@ # 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 +# 6/1/1 Gerd Kortemeyer +# 2/21,3/13 Guy +# 3/29,5/4 Gerd Kortemeyer + +package Apache::lonxml; +use vars +qw(@pwd @outputstack $redirection $import @extlinks $metamode); use strict; use HTML::TokeParser; +use Safe; +use Safe::Hole; +use Opcode; +use Apache::Constants qw(:common); + + +sub xmlbegin { + my $output=''; + if ($ENV{'browser.mathml'}) { + $output='' + .'' + .']>' + .''; + } else { + $output=''; + } + return $output; +} -#============================================================= style subroutine +sub xmlend { + return ''; +} -sub styleparser { +sub fontsettings() { + my $headerstring=''; + if (($ENV{'browser.os'} eq 'mac') && (!$ENV{'browser.mathml'})) { + $headerstring.= + ''; + } + return $headerstring; +} - my ($target,$content_style_string) = @_; +sub registerurl { + return (< + 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; + } + } + +ENDSCRIPT +} -#------------------------------------------- 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]; - } +sub loadevents() { + return 'LONCAPAreg();'; +} + +sub unloadevents() { + return 'LONCAPAstale();'; +} + +sub register { + my $space; + my @taglist; + my $temptag; + ($space,@taglist) = @_; + foreach $temptag (@taglist) { + $Apache::lonxml::alltags{$temptag}=$space; + } +} + +sub printalltags { + my $temp; + foreach $temp (sort keys %Apache::lonxml::alltags) { + &Apache::lonxml::debug("$temp -- $Apache::lonxml::alltags{$temp}"); + } +} +use Apache::style; +use Apache::run; +use Apache::londefdef; +use Apache::scripttag; +use Apache::edit; +#================================================== Main subroutine: xmlparse +@pwd=(); +@outputstack = (); +$redirection = 0; +$import = 1; +@extlinks=(); +$metamode = 0; + +sub xmlparse { + + my ($target,$content_file_string,$safeinit,%style_for_target) = @_; + if ($target eq 'meta') { + # meta mode is a bit weird only some output is to be turned off + # tag turns metamode off (defined in londefdef.pm) + $Apache::lonxml::redirection = 0; + $Apache::lonxml::metamode = 1; + $Apache::lonxml::import = 0; + } elsif ($target eq 'grade') { + &startredirection; + $Apache::lonxml::metamode = 0; + $Apache::lonxml::import = 1; + } else { + $Apache::lonxml::metamode = 0; + $Apache::lonxml::redirection = 0; + $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]:"); } - } 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 .= $stoken->[1]; - } - } else { - last; + #evaluate variable refs in result + if ($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]); } - } - } 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,''); } + $result = ''; + } + if ($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 $finaloutput; +} + - while ($stoken = $pstyle->get_token) { - if ($stoken->[0] eq 'T') { - $current_value .= $stoken->[1]; - } - if ($stoken->[0] eq 'E') { - last; - } - if ($stoken->[0] eq 'S') { - last; +sub recurse { + + my @innerstack = (); + my @innerparstack = (); + my ($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 $sub1; + no strict 'refs'; + if ($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); + $currentstring .= &$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 .= $token->[2]; + } + } + } + if ($target eq 'edit' && $token->[0] eq 'E') { + $currentstring .= &Apache::edit::tag_end($target,$token,$parstack,$parser, + $safeeval,$style); + } + 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 debuggin 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) { + 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]); + } } - } - $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 = ''; + #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]); + } +} - } - my %style_for_target = @value_style; -#--------------------------------------------------------------- check printing -# while (($current_key,$current_value) = each %style_for_target) { -# print "$current_key => $current_value\n"; -# } -#---------------------------------------------------------------- return result - return %style_for_target; +sub warning { + if ($Apache::lonxml::debug eq 1) { + print "WARNING:".$_[0]."
\n"; + } } 1; __END__ + +