Annotation of loncom/xml/lonxml.pm, revision 1.17
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;
1.13 albertel 11: use Opcode;
1.7 albertel 12:
13: sub register {
14: my $space;
15: my @taglist;
16: my $temptag;
17: ($space,@taglist) = @_;
18: foreach $temptag (@taglist) {
19: $Apache::lonxml::alltags{$temptag}=$space;
20: }
21: }
1.11 sakharuk 22:
1.4 albertel 23: use Apache::style;
1.3 sakharuk 24: use Apache::lontexconvert;
1.7 albertel 25: use Apache::run;
1.4 albertel 26: use Apache::londefdef;
1.7 albertel 27: use Apache::scripttag;
1.3 sakharuk 28: #================================================== Main subroutine: xmlparse
29:
30: sub xmlparse {
31:
32: my ($target,$content_file_string,%style_for_target) = @_;
1.16 albertel 33: my @pars = ();
34: push (@pars,HTML::TokeParser->new(\$content_file_string));
1.3 sakharuk 35: my $currentstring = '';
36: my $finaloutput = '';
37: my $newarg = '';
1.16 albertel 38: my $result;
1.3 sakharuk 39: my $safeeval = new Safe;
1.6 albertel 40: $safeeval->permit("entereval");
1.13 albertel 41: $safeeval->permit(":base_math");
1.3 sakharuk 42: #-------------------- Redefinition of the target in the case of compound target
43:
44: ($target, my @tenta) = split('&&',$target);
45:
46: my @stack = ();
47: my @parstack = ();
1.17 ! albertel 48: &initdepth;
1.3 sakharuk 49: my $token;
1.16 albertel 50: while ( $#pars > -1 ) {
51: while ($token = $pars[$#pars]->get_token) {
52: if ($token->[0] eq 'T') {
53: $result=$token->[1];
54: # $finaloutput .= &Apache::run::evaluate($token->[1],$safeeval,'');
55: } elsif ($token->[0] eq 'S') {
56: # add tag to stack
57: push (@stack,$token->[1]);
58: # add parameters list to another stack
59: push (@parstack,&parstring($token));
1.17 ! albertel 60: &increasedepth();
1.16 albertel 61: if (exists $style_for_target{$token->[1]}) {
62: $finaloutput .= &recurse($style_for_target{$token->[1]},
63: $target,$safeeval,\%style_for_target,
64: @parstack);
65: } else {
1.17 ! albertel 66: $result = &callsub("start_$token->[1]", $target, $token,\@parstack,
1.16 albertel 67: \@pars, $safeeval, \%style_for_target);
68: }
69: } elsif ($token->[0] eq 'E') {
70: #clear out any tags that didn't end
71: while ($token->[1] ne $stack[$#stack]
1.17 ! albertel 72: && ($#stack > -1)) {pop @stack;pop @parstack;&decreasedepth;}
1.16 albertel 73:
74: if (exists $style_for_target{'/'."$token->[1]"}) {
75: $finaloutput .= &recurse($style_for_target{'/'."$token->[1]"},
76: $target,$safeeval,\%style_for_target,
77: @parstack);
78: } else {
1.17 ! albertel 79: $result = &callsub("end_$token->[1]", $target, $token, \@parstack,
1.16 albertel 80: \@pars,$safeeval, \%style_for_target);
1.13 albertel 81: }
1.16 albertel 82: }
83: if ($result ne "" ) {
84: if ( $#parstack > -1 ) {
1.13 albertel 85: $finaloutput .= &Apache::run::evaluate($result,$safeeval,
86: $parstack[$#parstack]);
1.16 albertel 87: } else {
88: $finaloutput .= &Apache::run::evaluate($result,$safeeval,'');
1.13 albertel 89: }
1.16 albertel 90: $result = '';
1.2 sakharuk 91: }
1.17 ! albertel 92: if ($token->[0] eq 'E') { pop @stack;pop @parstack;&decreasedepth;}
1.5 albertel 93: }
1.16 albertel 94: pop @pars;
1.3 sakharuk 95: }
96: return $finaloutput;
1.15 albertel 97: }
98:
99: sub recurse {
100:
101: my @innerstack = ();
102: my @innerparstack = ();
103: my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_;
1.16 albertel 104: my @pat = ();
105: push (@pat,HTML::TokeParser->new(\$newarg));
1.15 albertel 106: my $tokenpat;
107: my $partstring = '';
108: my $output='';
1.16 albertel 109: my $decls='';
110: while ( $#pat > -1 ) {
111: while ($tokenpat = $pat[$#pat]->get_token) {
112: if ($tokenpat->[0] eq 'T') {
113: $partstring = $tokenpat->[1];
114: } elsif ($tokenpat->[0] eq 'S') {
115: push (@innerstack,$tokenpat->[1]);
116: push (@innerparstack,&parstring($tokenpat));
1.17 ! albertel 117: &increasedepth();
1.16 albertel 118: $partstring = &callsub("start_$tokenpat->[1]",
119: $target, $tokenpat, \@innerparstack,
120: \@pat, $safeeval, $style_for_target);
121: } elsif ($tokenpat->[0] eq 'E') {
122: #clear out any tags that didn't end
123: while ($tokenpat->[1] ne $innerstack[$#innerstack]
1.17 ! albertel 124: && ($#innerstack > -1)) {pop @innerstack;pop @innerparstack;
! 125: &decreasedepth;}
1.16 albertel 126: $partstring = &callsub("end_$tokenpat->[1]",
127: $target, $tokenpat, \@innerparstack,
128: \@pat, $safeeval, $style_for_target);
129: }
130: #pass both the variable to the style tag, and the tag we
131: #are processing inside the <definedtag>
132: if ( $partstring ne "" ) {
133: if ( $#parstack > -1 ) {
134: if ( $#innerparstack > -1 ) {
135: $decls= $parstack[$#parstack].$innerparstack[$#innerparstack];
136: } else {
137: $decls= $parstack[$#parstack];
138: }
139: } else {
140: if ( $#innerparstack > -1 ) {
141: $decls=$innerparstack[$#innerparstack];
142: } else {
143: $decls='';
144: }
145: }
146: $output .= &Apache::run::evaluate($partstring,$safeeval,$decls);
147: $partstring = '';
148: }
1.17 ! albertel 149: if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack;
! 150: &decreasedepth;}
1.15 albertel 151: }
1.16 albertel 152: pop @pat;
1.15 albertel 153: }
154: return $output;
1.7 albertel 155: }
156:
157: sub callsub {
1.14 albertel 158: my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_;
1.7 albertel 159: my $currentstring='';
160: {
161: no strict 'refs';
162: if (my $space=$Apache::lonxml::alltags{$token->[1]}) {
163: #print "Calling sub $sub in $space \n";
164: $sub="$space\:\:$sub";
1.17 ! albertel 165: $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
1.16 albertel 166: $currentstring = &$sub($target,$token,$parstack,$parser,
167: $safeeval,$style);
1.7 albertel 168: } else {
1.12 sakharuk 169: #print "NOT Calling sub $sub\n";
1.7 albertel 170: if (defined($token->[4])) {
171: $currentstring = $token->[4];
172: } else {
173: $currentstring = $token->[2];
174: }
175: }
176: use strict 'refs';
177: }
178: return $currentstring;
1.17 ! albertel 179: }
! 180:
! 181: sub initdepth {
! 182: @Apache::lonxml::depthcounter=();
! 183: $Apache::lonxml::depth=-1;
! 184: $Apache::lonxml::olddepth=-1;
! 185: }
! 186:
! 187: sub increasedepth {
! 188: if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) {
! 189: $#Apache::lonxml::depthcounter--;
! 190: $Apache::lonxml::olddepth=$Apache::lonxml::depth;
! 191: }
! 192: $Apache::lonxml::depth++;
! 193: $Apache::lonxml::depthcounter[$Apache::lonxml::depth]++;
! 194: if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) {
! 195: $Apache::lonxml::olddepth=$Apache::lonxml::depth;
! 196: }
! 197: }
! 198:
! 199: sub decreasedepth {
! 200: $Apache::lonxml::depth--;
1.1 sakharuk 201: }
202:
1.8 albertel 203: sub parstring {
204: my ($token) = @_;
205: my $temp='';
206: map {$temp .= "my \$$_=\"$token->[2]->{$_}\";"} @{$token->[3]};
207: return $temp;
208: }
1.1 sakharuk 209: 1;
210: __END__
1.11 sakharuk 211:
212:
213:
214:
215:
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