Annotation of loncom/xml/lonxml.pm, revision 1.8
1.2 sakharuk 1: # The LearningOnline Network with CAPA
1.3 sakharuk 2: # XML Parser Module
1.2 sakharuk 3: #
1.3 sakharuk 4: # last modified 06/26/00 by Alexander Sakharuk
1.2 sakharuk 5:
1.4 albertel 6: package Apache::lonxml;
1.1 sakharuk 7:
8: use strict;
9: use HTML::TokeParser;
1.3 sakharuk 10: use Safe;
1.7 albertel 11:
12: sub register {
13: my $space;
14: my @taglist;
15: my $temptag;
16: ($space,@taglist) = @_;
17: foreach $temptag (@taglist) {
18: $Apache::lonxml::alltags{$temptag}=$space;
19: }
20: }
21:
1.4 albertel 22: use Apache::style;
1.3 sakharuk 23: use Apache::lontexconvert;
1.7 albertel 24: use Apache::run;
1.4 albertel 25: use Apache::londefdef;
1.7 albertel 26: use Apache::scripttag;
1.3 sakharuk 27: #================================================== Main subroutine: xmlparse
28:
29: sub xmlparse {
30:
31: my ($target,$content_file_string,%style_for_target) = @_;
32: my $pars = HTML::TokeParser->new(\$content_file_string);
33: my $currentstring = '';
34: my $finaloutput = '';
35: my $newarg = '';
36: my $safeeval = new Safe;
1.6 albertel 37: $safeeval->permit("entereval");
1.3 sakharuk 38: #-------------------- Redefinition of the target in the case of compound target
39:
40: ($target, my @tenta) = split('&&',$target);
41:
42: #------------------------- Stack definition (in stack we have all current tags)
43:
44: my @stack = ();
45: my @parstack = ();
46:
47: #------------------------------------- Parse input string (content_file_string)
48:
49: my $token;
1.5 albertel 50:
1.3 sakharuk 51: while ($token = $pars->get_token) {
1.5 albertel 52: if ($token->[0] eq 'T') {
1.7 albertel 53: $finaloutput .= &Apache::run::evaluate($token->[1],$safeeval,'');
1.5 albertel 54: } elsif ($token->[0] eq 'S') {
1.7 albertel 55: # add tag to stack
1.5 albertel 56: push (@stack,$token->[1]);
1.7 albertel 57: # add parameters list to another stack
1.8 ! albertel 58: push (@parstack,&parstring($token));
1.5 albertel 59:
1.6 albertel 60: if (exists $style_for_target{$token->[1]}) {
1.8 ! albertel 61: #basically recurse, but we never got more than one level down so just
! 62: #create the new context here
! 63: my @innerstack = ();
! 64: my @innerparstack = ();
1.7 albertel 65: # use style file definition
1.8 ! albertel 66: $newarg = $style_for_target{$token->[1]};
1.7 albertel 67: my $pat = HTML::TokeParser->new(\$newarg);
68: my $tokenpat = '';
69: my $partstring = '';
1.8 ! albertel 70:
1.7 albertel 71: while ($tokenpat = $pat->get_token) {
72: if ($tokenpat->[0] eq 'T') {
73: $partstring = $tokenpat->[1];
74: } elsif ($tokenpat->[0] eq 'S') {
1.8 ! albertel 75: push (@innerstack,$tokenpat->[1]);
! 76: push (@innerparstack,&parstring($tokenpat));
! 77: $partstring = &callsub("start_$tokenpat->[1]",
! 78: $target, $tokenpat, \@innerparstack)
1.7 albertel 79: } elsif ($tokenpat->[0] eq 'E') {
1.8 ! albertel 80: #clear out any tags that didn't end
! 81: while ($tokenpat->[1] ne $innerstack[$#innerstack]
! 82: && ($#innerstack > 0)) {pop @innerstack;pop @innerparstack;}
! 83: $partstring = &callsub("end_$tokenpat->[1]",
! 84: $target, $tokenpat, \@innerparstack)
1.5 albertel 85: }
1.8 ! albertel 86: #pass both the variable to the style tag, and the tag we
! 87: #are processing inside the <definedtag>
! 88: $finaloutput .= &Apache::run::evaluate($partstring,$safeeval,
! 89: $parstack[$#parstack].$innerparstack[$#innerparstack]);
! 90: if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack; }
1.2 sakharuk 91: }
1.5 albertel 92: } else {
1.8 ! albertel 93: my $result = &callsub("start_$token->[1]", $target, $token, \@parstack);
! 94: $finaloutput .= &Apache::run::evaluate($result,$safeeval,
! 95: $parstack[$#parstack]);
1.5 albertel 96: }
97: } elsif ($token->[0] eq 'E') {
98: # Put here check for correct final tag (to avoid existence of
99: # starting tag only)
1.7 albertel 100:
1.3 sakharuk 101: pop @stack;
102: unless (exists $style_for_target{$token->[1]}) {
1.5 albertel 103: my $sub="end_$token->[1]";
1.7 albertel 104: $finaloutput .= callsub($sub, $target, $token, \@parstack);
1.3 sakharuk 105: }
1.5 albertel 106: #---- end tag from the style file
1.3 sakharuk 107: if (exists $style_for_target{'/'."$token->[1]"}) {
108: $newarg = $style_for_target{'/'."$token->[1]"};
109: if (index($newarg,'script') != -1 ) {
110: my $pat = HTML::TokeParser->new(\$newarg);
111: my $tokenpat;
112: my $partstring = '';
113: my $oustring = '';
114: my $outputstring;
1.5 albertel 115:
1.3 sakharuk 116: while ($tokenpat = $pat->get_token) {
1.5 albertel 117: if ($tokenpat->[0] eq 'T') {
118: $oustring .= $tokenpat->[1];
119: } elsif ($tokenpat->[0] eq 'S') {
1.3 sakharuk 120: if ($tokenpat->[1] eq 'script') {
121: while ($tokenpat = $pat->get_token and $tokenpat->[1] ne 'script') {
1.5 albertel 122: if ($tokenpat->[0] eq 'S') {
1.7 albertel 123:
1.5 albertel 124: $partstring .= $tokenpat->[4];
125: } elsif ($tokenpat->[0] eq 'T') {
126: $partstring .= $tokenpat->[1];
127: } elsif ($tokenpat->[0] eq 'E') {
128: $partstring .= $tokenpat->[2];
129: }
1.2 sakharuk 130: }
1.5 albertel 131:
1.3 sakharuk 132: my @tempor_list = split(',',$parstack[$#parstack]);
133: my @te_kl = ();
134: my %tempor_hash = ();
135: map {(my $onete,my $twote) = split('=',$_); push (@te_kl,$onete);
136: $tempor_hash{$onete} = $twote} @tempor_list;
137: map {$partstring =~ s/\$$_/$tempor_hash{$_}/g; } @te_kl;
1.6 albertel 138: print "want to use run\n";
139: &Apache::run::run($partstring,$safeeval);
1.5 albertel 140:
1.3 sakharuk 141: $partstring = '';
142: } elsif ($tokenpat->[1] eq 'evaluate') {
1.6 albertel 143: $outputstring = &Apache::run::evaluate($tokenpat->[2]{expression},$safeeval);
1.5 albertel 144: $oustring .= $outputstring;
1.3 sakharuk 145: } else {
1.5 albertel 146: $oustring .= $tokenpat->[4];
1.3 sakharuk 147: }
1.5 albertel 148: } elsif ($tokenpat->[0] eq 'E' and $tokenpat->[1] ne 'evaluate') {
1.3 sakharuk 149: $oustring .= $tokenpat->[1];
1.5 albertel 150: }
1.3 sakharuk 151: }
1.5 albertel 152: $newarg = $oustring;
1.3 sakharuk 153: } else {
1.5 albertel 154: my @very_temp = split(',',$parstack[$#parstack]);
1.3 sakharuk 155: map {my @ret= split('=',$_); $newarg =~ s/\$$ret[0]/$ret[1]/g; } @very_temp;
1.2 sakharuk 156: }
1.5 albertel 157:
1.3 sakharuk 158: $finaloutput .= $newarg;
1.2 sakharuk 159: }
1.3 sakharuk 160: pop @parstack;
1.5 albertel 161: }
1.3 sakharuk 162: }
163: return $finaloutput;
1.7 albertel 164: }
165:
166: sub callsub {
167: my ($sub,$target,$token,@parstack)=@_;
168: my $currentstring='';
169: {
170: no strict 'refs';
171: if (my $space=$Apache::lonxml::alltags{$token->[1]}) {
172: #print "Calling sub $sub in $space \n";
173: $sub="$space\:\:$sub";
174: $currentstring = &$sub($target,$token,\@parstack);
175: } else {
176: #print "NOT Calling sub $sub\n";
177: if (defined($token->[4])) {
178: $currentstring = $token->[4];
179: } else {
180: $currentstring = $token->[2];
181: }
182: }
183: use strict 'refs';
184: }
185: return $currentstring;
1.1 sakharuk 186: }
187:
1.8 ! albertel 188: sub parstring {
! 189: my ($token) = @_;
! 190: my $temp='';
! 191: map {$temp .= "my \$$_=\"$token->[2]->{$_}\";"} @{$token->[3]};
! 192: return $temp;
! 193: }
1.1 sakharuk 194: 1;
195: __END__
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