version 1.2, 2000/06/23 20:40:06
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version 1.23, 2000/10/05 19:30:14
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# The LearningOnline Network with CAPA |
# The LearningOnline Network with CAPA |
# Style Parser Module |
# XML Parser Module |
# |
# |
# last modified 06/23/00 by Alexander Sakharuk |
# last modified 06/26/00 by Alexander Sakharuk |
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package Apache::lonstyleparser; |
package Apache::lonxml; |
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use strict; |
use strict; |
use HTML::TokeParser; |
use HTML::TokeParser; |
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use Safe; |
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use Opcode; |
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#============================================================= style subroutine |
sub register { |
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my $space; |
sub styleparser { |
my @taglist; |
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my $temptag; |
my ($target,$content_style_string) = @_; |
($space,@taglist) = @_; |
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foreach $temptag (@taglist) { |
#------------------------------------------- target redefinition (if necessary) |
$Apache::lonxml::alltags{$temptag}=$space; |
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} |
my @target_string = ''; |
} |
my $element; |
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use Apache::style; |
($element,@target_string) = split ('&&',$target); |
use Apache::lontexconvert; |
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use Apache::run; |
map {$content_style_string =~ s/\<(.*)$_\>/\<$1$element\>/g; } @target_string; |
use Apache::londefdef; |
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use Apache::scripttag; |
$target = $element; |
#================================================== Main subroutine: xmlparse |
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@Apache::lonxml::pwd=(); |
#-------------------------------------------- create a table for defined target |
sub xmlparse { |
#----------------------------------------- from the information from Style File |
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my ($target,$content_file_string,$safeinit,%style_for_target) = @_; |
my @value_style = (); |
my @pars = (); |
my $current_key = ''; |
@Apache::lonxml::pwd=(); |
my $current_value = ''; |
my $pwd=$ENV{'request.filename'}; |
my $stoken; |
$pwd =~ s:/[^/]*$::; |
my $flag; |
&newparser(\@pars,\$content_file_string,$pwd); |
my $iele; |
my $currentstring = ''; |
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my $finaloutput = ''; |
my $pstyle = HTML::TokeParser->new(\$content_style_string); |
my $newarg = ''; |
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my $result; |
while ($stoken = $pstyle->get_token) { |
my $safeeval = new Safe; |
#----------------------------------------------------- start for tag definition |
$safeeval->permit("entereval"); |
if ($stoken->[0] eq 'S' and $stoken->[1] eq 'definetag') { |
$safeeval->permit(":base_math"); |
#-------------------------------------------------------------- new key in hash |
$safeeval->deny(":base_io"); |
$current_key = $stoken->[2]{name}; |
#need to inspect this class of ops |
$flag = 0; |
# $safeeval->deny(":base_orig"); |
#-------------------------------------------------------------- metadata output |
$safeinit .= ';$external::target='.$target.';'; |
if ($target eq 'meta') { |
&Apache::run::run($safeinit,$safeeval); |
while ($stoken = $pstyle->get_token and $stoken->[1] ne 'definetag') { |
#-------------------- Redefinition of the target in the case of compound target |
if ($stoken->[0] eq 'S' and $stoken->[1] eq 'meta') { |
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while ($stoken = $pstyle->get_token and $stoken->[1] ne 'meta') { |
($target, my @tenta) = split('&&',$target); |
$current_value .= $stoken->[1]; |
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} |
my @stack = (); |
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my @parstack = (); |
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&initdepth; |
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my $token; |
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while ( $#pars > -1 ) { |
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while ($token = $pars[$#pars]->get_token) { |
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if ($token->[0] eq 'T') { |
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$result=$token->[1]; |
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# $finaloutput .= &Apache::run::evaluate($token->[1],$safeeval,''); |
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} elsif ($token->[0] eq 'S') { |
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# add tag to stack |
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push (@stack,$token->[1]); |
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# add parameters list to another stack |
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push (@parstack,&parstring($token)); |
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&increasedepth($token); |
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if (exists $style_for_target{$token->[1]}) { |
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$finaloutput .= &recurse($style_for_target{$token->[1]}, |
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$target,$safeeval,\%style_for_target, |
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@parstack); |
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} else { |
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$result = &callsub("start_$token->[1]", $target, $token,\@parstack, |
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\@pars, $safeeval, \%style_for_target); |
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} |
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} elsif ($token->[0] eq 'E') { |
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#clear out any tags that didn't end |
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while ($token->[1] ne $stack[$#stack] |
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&& ($#stack > -1)) {pop @stack;pop @parstack;&decreasedepth($token);} |
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if (exists $style_for_target{'/'."$token->[1]"}) { |
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$finaloutput .= &recurse($style_for_target{'/'."$token->[1]"}, |
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$target,$safeeval,\%style_for_target, |
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@parstack); |
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} else { |
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$result = &callsub("end_$token->[1]", $target, $token, \@parstack, |
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\@pars,$safeeval, \%style_for_target); |
} |
} |
} |
} |
} else { |
if ($result ne "" ) { |
#--------------------------------------------------------------- outtext output |
if ( $#parstack > -1 ) { |
while ($stoken = $pstyle->get_token and $stoken->[1] ne 'outtext') { |
$finaloutput .= &Apache::run::evaluate($result,$safeeval, |
if ($stoken->[1] eq 'definetag') { |
$parstack[$#parstack]); |
$flag = 1; |
} else { |
last; |
$finaloutput .= &Apache::run::evaluate($result,$safeeval,''); |
} |
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} |
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if ($flag == 0) { |
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while ($stoken = $pstyle->get_token and $stoken->[0] ne 'S') { |
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$current_value .= $stoken->[1]; |
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} |
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while ($stoken->[1] ne 'definetag') { |
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if ($stoken->[0] eq 'S' and $stoken->[1] eq $target) { |
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while ($stoken = $pstyle->get_token) { |
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if ($stoken->[1] ne $target) { |
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if ($stoken->[0] eq 'S') { |
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my $flagelem = 0; |
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for (my $i=$#value_style-1;$i>0;$i=$i-2) { |
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if ($stoken->[1] eq $value_style[$i]) { |
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$flagelem = 1; |
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$iele = $i+1; |
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last; |
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} |
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} |
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if ($flagelem == 0) { |
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$current_value .= $stoken->[4]; |
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} else { |
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$current_value .= $value_style[$iele]; |
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} |
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} |
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if ($stoken->[0] eq 'E') { |
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my $flagelem = 0; |
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for (my $i=$#value_style-1;$i>0;$i=$i-2) { |
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if ('/'.$stoken->[1] eq $value_style[$i]) { |
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$flagelem = 1; |
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$iele = $i+1; |
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last; |
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} |
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} |
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if ($flagelem == 0) { |
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$current_value .= $stoken->[2]; |
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} else { |
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$current_value .= $value_style[$iele]; |
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} |
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} |
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if ($stoken->[0] eq 'T') { |
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$current_value .= $stoken->[1]; |
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} |
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} else { |
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last; |
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} |
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} |
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} elsif ($stoken->[0] eq 'S' and $stoken->[1] ne $target) { |
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my $tempotempo = $stoken->[1]; |
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while ($stoken = $pstyle->get_token and $stoken->[1] ne $tempotempo) { |
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} |
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} |
} |
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$result = ''; |
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} |
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if ($token->[0] eq 'E') { pop @stack;pop @parstack;&decreasedepth($token);} |
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} |
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pop @pars; |
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pop @Apache::lonxml::pwd; |
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} |
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return $finaloutput; |
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} |
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while ($stoken = $pstyle->get_token) { |
sub recurse { |
if ($stoken->[0] eq 'T') { |
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$current_value .= $stoken->[1]; |
my @innerstack = (); |
} |
my @innerparstack = (); |
if ($stoken->[0] eq 'E') { |
my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_; |
last; |
my @pat = (); |
} |
&newparser(\@pat,\$newarg); |
if ($stoken->[0] eq 'S') { |
my $tokenpat; |
last; |
my $partstring = ''; |
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my $output=''; |
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my $decls=''; |
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while ( $#pat > -1 ) { |
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while ($tokenpat = $pat[$#pat]->get_token) { |
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if ($tokenpat->[0] eq 'T') { |
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$partstring = $tokenpat->[1]; |
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} elsif ($tokenpat->[0] eq 'S') { |
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push (@innerstack,$tokenpat->[1]); |
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push (@innerparstack,&parstring($tokenpat)); |
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&increasedepth($tokenpat); |
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$partstring = &callsub("start_$tokenpat->[1]", |
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$target, $tokenpat, \@innerparstack, |
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\@pat, $safeeval, $style_for_target); |
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} elsif ($tokenpat->[0] eq 'E') { |
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#clear out any tags that didn't end |
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while ($tokenpat->[1] ne $innerstack[$#innerstack] |
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&& ($#innerstack > -1)) {pop @innerstack;pop @innerparstack; |
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&decreasedepth($tokenpat);} |
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$partstring = &callsub("end_$tokenpat->[1]", |
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$target, $tokenpat, \@innerparstack, |
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\@pat, $safeeval, $style_for_target); |
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} |
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#pass both the variable to the style tag, and the tag we |
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#are processing inside the <definedtag> |
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if ( $partstring ne "" ) { |
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if ( $#parstack > -1 ) { |
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if ( $#innerparstack > -1 ) { |
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$decls= $parstack[$#parstack].$innerparstack[$#innerparstack]; |
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} else { |
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$decls= $parstack[$#parstack]; |
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} |
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} else { |
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if ( $#innerparstack > -1 ) { |
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$decls=$innerparstack[$#innerparstack]; |
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} else { |
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$decls=''; |
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} |
} |
} |
} |
$output .= &Apache::run::evaluate($partstring,$safeeval,$decls); |
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$partstring = ''; |
} |
} |
} |
if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack; |
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&decreasedepth($tokenpat);} |
} |
} |
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pop @pat; |
} |
pop @Apache::lonxml::pwd; |
$current_value =~ s/(\s)+/$1/g; |
} |
if ($current_value ne ' ' and $current_value ne '' ) { |
return $output; |
push (@value_style,lc $current_key,$current_value); |
} |
} |
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$current_key = ''; |
sub callsub { |
$current_value = ''; |
my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_; |
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my $currentstring=''; |
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{ |
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no strict 'refs'; |
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if (my $space=$Apache::lonxml::alltags{$token->[1]}) { |
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#&Apache::lonxml::debug("Calling sub $sub in $space<br>\n"); |
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$sub="$space\:\:$sub"; |
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$Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter); |
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$currentstring = &$sub($target,$token,$parstack,$parser, |
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$safeeval,$style); |
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} else { |
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#&Apache::lonxml::debug("NOT Calling sub $sub in $space<br>\n"); |
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if (defined($token->[4])) { |
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$currentstring = $token->[4]; |
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} else { |
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$currentstring = $token->[2]; |
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} |
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} |
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use strict 'refs'; |
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} |
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return $currentstring; |
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} |
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sub initdepth { |
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@Apache::lonxml::depthcounter=(); |
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$Apache::lonxml::depth=-1; |
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$Apache::lonxml::olddepth=-1; |
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} |
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} |
sub increasedepth { |
my %style_for_target = @value_style; |
my ($token) = @_; |
#--------------------------------------------------------------- check printing |
if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) { |
# while (($current_key,$current_value) = each %style_for_target) { |
$#Apache::lonxml::depthcounter--; |
# print "$current_key => $current_value\n"; |
$Apache::lonxml::olddepth=$Apache::lonxml::depth; |
# } |
} |
#---------------------------------------------------------------- return result |
$Apache::lonxml::depth++; |
return %style_for_target; |
# print "<br>s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1]<br>\n"; |
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$Apache::lonxml::depthcounter[$Apache::lonxml::depth]++; |
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if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) { |
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$Apache::lonxml::olddepth=$Apache::lonxml::depth; |
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} |
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} |
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sub decreasedepth { |
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my ($token) = @_; |
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$Apache::lonxml::depth--; |
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# print "<br>e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1]<br>\n"; |
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} |
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sub get_all_text { |
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my($tag,$pars)= @_; |
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my $depth=0; |
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my $token; |
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my $result=''; |
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while (($depth >=0) && ($token = $pars->get_token)) { |
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if ($token->[0] eq 'T') { |
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$result.=$token->[1]; |
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} elsif ($token->[0] eq 'S') { |
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if ($token->[1] eq $tag) { $depth++; } |
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$result.=$token->[4]; |
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} elsif ($token->[0] eq 'E') { |
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if ($token->[1] eq $tag) { $depth--; } |
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#skip sending back the last end tag |
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if ($depth > -1) { $result.=$token->[2]; } |
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} |
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} |
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return $result |
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} |
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sub newparser { |
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my ($parser,$contentref,$dir) = @_; |
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push (@$parser,HTML::TokeParser->new($contentref)); |
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if ( $dir eq '' ) { |
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push (@Apache::lonxml::pwd, $Apache::lonxml::pwd[$#Apache::lonxml::pwd]); |
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} else { |
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push (@Apache::lonxml::pwd, $dir); |
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} |
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# &Apache::lonxml::debug("pwd:$#Apache::lonxml::pwd"); |
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# &Apache::lonxml::debug("pwd:$Apache::lonxml::pwd[$#Apache::lonxml::pwd]"); |
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} |
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sub parstring { |
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my ($token) = @_; |
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my $temp=''; |
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map { |
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if ($_=~/\w+/) { |
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$temp .= "my \$$_=\"$token->[2]->{$_}\";" |
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} |
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} @{$token->[3]}; |
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return $temp; |
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} |
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$Apache::lonxml::debug=0; |
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sub debug { |
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if ($Apache::lonxml::debug eq 1) { |
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print "DEBUG:".$_[0]."<br>\n"; |
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} |
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} |
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sub error { |
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print "ERROR:".$_[0]."<br>\n"; |
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} |
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sub warning { |
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if ($Apache::lonxml::debug eq 1) { |
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print "WARNING:".$_[0]."<br>\n"; |
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} |
} |
} |
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1; |
1; |
__END__ |
__END__ |
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