Annotation of loncom/xml/lonxml.pm, revision 1.30
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
1.23 albertel 29: @Apache::lonxml::pwd=();
1.25 sakharuk 30: $Apache::lonxml::outputstack = '';
31: $Apache::lonxml::redirection = 1;
1.30 ! sakharuk 32: $Apache::lonxml::textredirection = 1;
1.25 sakharuk 33:
1.3 sakharuk 34: sub xmlparse {
35:
1.18 albertel 36: my ($target,$content_file_string,$safeinit,%style_for_target) = @_;
1.30 ! sakharuk 37: if ($target eq 'meta') {$Apache::lonxml::textredirection = 0;}
1.16 albertel 38: my @pars = ();
1.23 albertel 39: @Apache::lonxml::pwd=();
40: my $pwd=$ENV{'request.filename'};
41: $pwd =~ s:/[^/]*$::;
42: &newparser(\@pars,\$content_file_string,$pwd);
1.3 sakharuk 43: my $currentstring = '';
44: my $finaloutput = '';
45: my $newarg = '';
1.16 albertel 46: my $result;
1.24 sakharuk 47:
1.3 sakharuk 48: my $safeeval = new Safe;
1.6 albertel 49: $safeeval->permit("entereval");
1.13 albertel 50: $safeeval->permit(":base_math");
1.19 albertel 51: $safeeval->deny(":base_io");
52: #need to inspect this class of ops
53: # $safeeval->deny(":base_orig");
1.21 albertel 54: $safeinit .= ';$external::target='.$target.';';
1.26 albertel 55: $safeinit .= ';$external::randomseed='.&Apache::lonnet::rndseed().';';
1.21 albertel 56: &Apache::run::run($safeinit,$safeeval);
1.3 sakharuk 57: #-------------------- Redefinition of the target in the case of compound target
58:
59: ($target, my @tenta) = split('&&',$target);
60:
61: my @stack = ();
62: my @parstack = ();
1.17 albertel 63: &initdepth;
1.3 sakharuk 64: my $token;
1.16 albertel 65: while ( $#pars > -1 ) {
66: while ($token = $pars[$#pars]->get_token) {
67: if ($token->[0] eq 'T') {
1.30 ! sakharuk 68: if ($Apache::lonxml::textredirection == 1) {$result=$token->[1];}
1.16 albertel 69: # $finaloutput .= &Apache::run::evaluate($token->[1],$safeeval,'');
70: } elsif ($token->[0] eq 'S') {
1.30 ! sakharuk 71: if ($target eq 'meta' and $token->[2]->{metaout} eq 'ON') {$Apache::lonxml::textredirection = 1;}
1.16 albertel 72: # add tag to stack
73: push (@stack,$token->[1]);
74: # add parameters list to another stack
75: push (@parstack,&parstring($token));
1.19 albertel 76: &increasedepth($token);
1.16 albertel 77: if (exists $style_for_target{$token->[1]}) {
1.24 sakharuk 78:
1.25 sakharuk 79: if ($Apache::lonxml::redirection == 1) {
1.24 sakharuk 80: $finaloutput .= &recurse($style_for_target{$token->[1]},
81: $target,$safeeval,\%style_for_target,
82: @parstack);
83: } else {
1.25 sakharuk 84: $Apache::lonxml::outputstack .= &recurse($style_for_target{$token->[1]},
1.24 sakharuk 85: $target,$safeeval,\%style_for_target,
86: @parstack);
87: }
88:
1.16 albertel 89: } else {
1.17 albertel 90: $result = &callsub("start_$token->[1]", $target, $token,\@parstack,
1.16 albertel 91: \@pars, $safeeval, \%style_for_target);
92: }
93: } elsif ($token->[0] eq 'E') {
1.30 ! sakharuk 94: if ($target eq 'meta') {$Apache::lonxml::textredirection = 0;}
1.16 albertel 95: #clear out any tags that didn't end
96: while ($token->[1] ne $stack[$#stack]
1.19 albertel 97: && ($#stack > -1)) {pop @stack;pop @parstack;&decreasedepth($token);}
1.16 albertel 98:
99: if (exists $style_for_target{'/'."$token->[1]"}) {
1.24 sakharuk 100:
1.25 sakharuk 101: if ($Apache::lonxml::redirection == 1) {
1.16 albertel 102: $finaloutput .= &recurse($style_for_target{'/'."$token->[1]"},
103: $target,$safeeval,\%style_for_target,
104: @parstack);
1.24 sakharuk 105: } else {
1.25 sakharuk 106: $Apache::lonxml::outputstack .= &recurse($style_for_target{'/'."$token->[1]"},
1.24 sakharuk 107: $target,$safeeval,\%style_for_target,
108: @parstack);
109: }
110:
1.16 albertel 111: } else {
1.17 albertel 112: $result = &callsub("end_$token->[1]", $target, $token, \@parstack,
1.16 albertel 113: \@pars,$safeeval, \%style_for_target);
1.13 albertel 114: }
1.16 albertel 115: }
1.25 sakharuk 116: if ($result ne "") {
1.24 sakharuk 117: if ( $#parstack > -1 ) {
118:
1.25 sakharuk 119: if ($Apache::lonxml::redirection == 1) {
1.13 albertel 120: $finaloutput .= &Apache::run::evaluate($result,$safeeval,
121: $parstack[$#parstack]);
1.24 sakharuk 122: } else {
1.25 sakharuk 123: $Apache::lonxml::outputstack .= &Apache::run::evaluate($result,$safeeval,
1.24 sakharuk 124: $parstack[$#parstack]);
125: }
126:
1.16 albertel 127: } else {
128: $finaloutput .= &Apache::run::evaluate($result,$safeeval,'');
1.13 albertel 129: }
1.16 albertel 130: $result = '';
1.25 sakharuk 131: } else {
132: $finaloutput .= $result;
1.2 sakharuk 133: }
1.19 albertel 134: if ($token->[0] eq 'E') { pop @stack;pop @parstack;&decreasedepth($token);}
1.5 albertel 135: }
1.16 albertel 136: pop @pars;
1.23 albertel 137: pop @Apache::lonxml::pwd;
1.3 sakharuk 138: }
1.24 sakharuk 139:
1.3 sakharuk 140: return $finaloutput;
1.15 albertel 141: }
142:
143: sub recurse {
144:
145: my @innerstack = ();
146: my @innerparstack = ();
147: my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_;
1.16 albertel 148: my @pat = ();
1.23 albertel 149: &newparser(\@pat,\$newarg);
1.15 albertel 150: my $tokenpat;
151: my $partstring = '';
152: my $output='';
1.16 albertel 153: my $decls='';
154: while ( $#pat > -1 ) {
155: while ($tokenpat = $pat[$#pat]->get_token) {
156: if ($tokenpat->[0] eq 'T') {
1.30 ! sakharuk 157: if ($Apache::lonxml::textredirection == 1) {$partstring = $tokenpat->[1];}
1.16 albertel 158: } elsif ($tokenpat->[0] eq 'S') {
159: push (@innerstack,$tokenpat->[1]);
160: push (@innerparstack,&parstring($tokenpat));
1.19 albertel 161: &increasedepth($tokenpat);
1.16 albertel 162: $partstring = &callsub("start_$tokenpat->[1]",
163: $target, $tokenpat, \@innerparstack,
164: \@pat, $safeeval, $style_for_target);
165: } elsif ($tokenpat->[0] eq 'E') {
166: #clear out any tags that didn't end
167: while ($tokenpat->[1] ne $innerstack[$#innerstack]
1.17 albertel 168: && ($#innerstack > -1)) {pop @innerstack;pop @innerparstack;
1.19 albertel 169: &decreasedepth($tokenpat);}
1.16 albertel 170: $partstring = &callsub("end_$tokenpat->[1]",
171: $target, $tokenpat, \@innerparstack,
172: \@pat, $safeeval, $style_for_target);
173: }
174: #pass both the variable to the style tag, and the tag we
175: #are processing inside the <definedtag>
176: if ( $partstring ne "" ) {
177: if ( $#parstack > -1 ) {
178: if ( $#innerparstack > -1 ) {
179: $decls= $parstack[$#parstack].$innerparstack[$#innerparstack];
180: } else {
181: $decls= $parstack[$#parstack];
182: }
183: } else {
184: if ( $#innerparstack > -1 ) {
185: $decls=$innerparstack[$#innerparstack];
186: } else {
187: $decls='';
188: }
189: }
190: $output .= &Apache::run::evaluate($partstring,$safeeval,$decls);
191: $partstring = '';
192: }
1.17 albertel 193: if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack;
1.19 albertel 194: &decreasedepth($tokenpat);}
1.15 albertel 195: }
1.16 albertel 196: pop @pat;
1.23 albertel 197: pop @Apache::lonxml::pwd;
1.15 albertel 198: }
199: return $output;
1.7 albertel 200: }
201:
202: sub callsub {
1.14 albertel 203: my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_;
1.7 albertel 204: my $currentstring='';
205: {
1.24 sakharuk 206: my $sub1;
1.7 albertel 207: no strict 'refs';
208: if (my $space=$Apache::lonxml::alltags{$token->[1]}) {
1.26 albertel 209: #&Apache::lonxml::debug("Calling sub $sub in $space<br>\n");
1.24 sakharuk 210: $sub1="$space\:\:$sub";
1.17 albertel 211: $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
1.24 sakharuk 212: $currentstring = &$sub1($target,$token,$parstack,$parser,
1.16 albertel 213: $safeeval,$style);
1.7 albertel 214: } else {
1.23 albertel 215: #&Apache::lonxml::debug("NOT Calling sub $sub in $space<br>\n");
1.7 albertel 216: if (defined($token->[4])) {
217: $currentstring = $token->[4];
218: } else {
219: $currentstring = $token->[2];
220: }
221: }
222: use strict 'refs';
223: }
224: return $currentstring;
1.17 albertel 225: }
226:
227: sub initdepth {
228: @Apache::lonxml::depthcounter=();
229: $Apache::lonxml::depth=-1;
230: $Apache::lonxml::olddepth=-1;
231: }
232:
233: sub increasedepth {
1.19 albertel 234: my ($token) = @_;
1.17 albertel 235: if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) {
236: $#Apache::lonxml::depthcounter--;
237: $Apache::lonxml::olddepth=$Apache::lonxml::depth;
238: }
239: $Apache::lonxml::depth++;
1.19 albertel 240: # print "<br>s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1]<br>\n";
1.17 albertel 241: $Apache::lonxml::depthcounter[$Apache::lonxml::depth]++;
242: if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) {
243: $Apache::lonxml::olddepth=$Apache::lonxml::depth;
244: }
245: }
246:
247: sub decreasedepth {
1.19 albertel 248: my ($token) = @_;
1.17 albertel 249: $Apache::lonxml::depth--;
1.19 albertel 250: # print "<br>e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1]<br>\n";
1.1 sakharuk 251: }
1.19 albertel 252:
253: sub get_all_text {
254:
255: my($tag,$pars)= @_;
256: my $depth=0;
257: my $token;
258: my $result='';
1.24 sakharuk 259: my $tag=substr($tag,1); #strip the / off the tag
260: # &Apache::lonxml::debug("have:$tag:");
1.19 albertel 261: while (($depth >=0) && ($token = $pars->get_token)) {
262: if ($token->[0] eq 'T') {
263: $result.=$token->[1];
264: } elsif ($token->[0] eq 'S') {
265: if ($token->[1] eq $tag) { $depth++; }
266: $result.=$token->[4];
267: } elsif ($token->[0] eq 'E') {
1.24 sakharuk 268: if ( $token->[1] eq $tag) { $depth--; }
1.19 albertel 269: #skip sending back the last end tag
270: if ($depth > -1) { $result.=$token->[2]; }
271: }
272: }
273: return $result
274: }
275:
1.23 albertel 276: sub newparser {
277: my ($parser,$contentref,$dir) = @_;
278: push (@$parser,HTML::TokeParser->new($contentref));
279: if ( $dir eq '' ) {
280: push (@Apache::lonxml::pwd, $Apache::lonxml::pwd[$#Apache::lonxml::pwd]);
281: } else {
282: push (@Apache::lonxml::pwd, $dir);
283: }
284: # &Apache::lonxml::debug("pwd:$#Apache::lonxml::pwd");
285: # &Apache::lonxml::debug("pwd:$Apache::lonxml::pwd[$#Apache::lonxml::pwd]");
286: }
1.1 sakharuk 287:
1.8 albertel 288: sub parstring {
289: my ($token) = @_;
290: my $temp='';
1.20 albertel 291: map {
292: if ($_=~/\w+/) {
293: $temp .= "my \$$_=\"$token->[2]->{$_}\";"
294: }
295: } @{$token->[3]};
1.8 albertel 296: return $temp;
297: }
1.22 albertel 298:
1.24 sakharuk 299: sub handler {
300: my $request=shift;
301:
1.30 ! sakharuk 302: my $target='meta';
1.24 sakharuk 303: $Apache::lonxml::debug=1;
1.25 sakharuk 304: if ($ENV{'browser.mathml'}) {
1.27 albertel 305: $request->content_type('text/xml');
306: } else {
307: $request->content_type('text/html');
1.25 sakharuk 308: }
1.29 sakharuk 309:
310: # $request->print(<<ENDHEADER);
311: #<html>
312: #<head>
313: #<title>Just test</title>
314: #</head>
315: #<body bgcolor="#FFFFFF">
316: #ENDHEADER
317: # &Apache::lonhomework::send_header($request);
1.27 albertel 318: $request->send_http_header;
319:
1.28 albertel 320: return 'OK' if $request->header_only;
1.27 albertel 321:
322: $request->print(&Apache::lontexconvert::header());
323:
1.28 albertel 324: $request->print('<body bgcolor="#FFFFFF">'."\n");
1.27 albertel 325:
1.24 sakharuk 326: my $file = "/home/httpd/html".$request->uri;
327: my %mystyle;
328: my $result = '';
329: $result = Apache::lonxml::xmlparse($target, &Apache::lonnet::getfile($file),'',%mystyle);
330: $request->print($result);
1.29 sakharuk 331:
1.28 albertel 332: $request->print('</body>');
333: $request->print(&Apache::lontexconvert::footer());
334: return 'OK';
1.24 sakharuk 335: }
336:
1.22 albertel 337: $Apache::lonxml::debug=0;
338: sub debug {
339: if ($Apache::lonxml::debug eq 1) {
340: print "DEBUG:".$_[0]."<br>\n";
341: }
342: }
343: sub error {
1.23 albertel 344: print "ERROR:".$_[0]."<br>\n";
1.22 albertel 345: }
346: sub warning {
347: if ($Apache::lonxml::debug eq 1) {
348: print "WARNING:".$_[0]."<br>\n";
349: }
350: }
351:
1.1 sakharuk 352: 1;
353: __END__
1.25 sakharuk 354:
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1.11 sakharuk 367:
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