Annotation of loncom/xml/lonxml.pm, revision 1.56
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
1.33 www 5: # 11/6 Gerd Kortemeyer
1.45 www 6: # 6/1/1 Gerd Kortemeyer
1.56 ! albertel 7: # 2/21,3/13 Guy
1.2 sakharuk 8:
1.4 albertel 9: package Apache::lonxml;
1.33 www 10: use vars
1.55 albertel 11: qw(@pwd @outputstack $redirection $textredirection $import @extlinks);
1.1 sakharuk 12: use strict;
13: use HTML::TokeParser;
1.3 sakharuk 14: use Safe;
1.40 albertel 15: use Safe::Hole;
1.13 albertel 16: use Opcode;
1.46 www 17: use Apache::Constants qw(:common);
1.7 albertel 18:
19: sub register {
20: my $space;
21: my @taglist;
22: my $temptag;
23: ($space,@taglist) = @_;
24: foreach $temptag (@taglist) {
25: $Apache::lonxml::alltags{$temptag}=$space;
26: }
27: }
1.48 albertel 28:
29: sub printalltags {
30: my $temp;
31: foreach $temp (sort keys %Apache::lonxml::alltags) {
32: &Apache::lonxml::debug("$temp -- $Apache::lonxml::alltags{$temp}");
33: }
34: }
1.4 albertel 35: use Apache::style;
1.3 sakharuk 36: use Apache::lontexconvert;
1.7 albertel 37: use Apache::run;
1.4 albertel 38: use Apache::londefdef;
1.7 albertel 39: use Apache::scripttag;
1.3 sakharuk 40: #================================================== Main subroutine: xmlparse
1.33 www 41: @pwd=();
1.55 albertel 42: @outputstack = ();
43: $redirection = 0;
44: $import = 1;
1.33 www 45: @extlinks=();
1.31 sakharuk 46:
1.3 sakharuk 47: sub xmlparse {
48:
1.18 albertel 49: my ($target,$content_file_string,$safeinit,%style_for_target) = @_;
1.41 albertel 50: if ($target eq 'meta') {
1.55 albertel 51: &startredirection;
52: $Apache::lonxml::import = 0;
1.47 albertel 53: } elsif ($target eq 'grade') {
1.55 albertel 54: &startredirection;
55: $Apache::lonxml::import = 1;
1.44 albertel 56: } else {
1.55 albertel 57: $Apache::lonxml::redirection = 0;
58: $Apache::lonxml::import = 1;
1.32 sakharuk 59: }
1.48 albertel 60: #&printalltags();
1.16 albertel 61: my @pars = ();
1.23 albertel 62: @Apache::lonxml::pwd=();
63: my $pwd=$ENV{'request.filename'};
64: $pwd =~ s:/[^/]*$::;
65: &newparser(\@pars,\$content_file_string,$pwd);
1.3 sakharuk 66: my $currentstring = '';
67: my $finaloutput = '';
68: my $newarg = '';
1.16 albertel 69: my $result;
1.24 sakharuk 70:
1.3 sakharuk 71: my $safeeval = new Safe;
1.40 albertel 72: my $safehole = new Safe::Hole;
1.6 albertel 73: $safeeval->permit("entereval");
1.13 albertel 74: $safeeval->permit(":base_math");
1.19 albertel 75: $safeeval->deny(":base_io");
1.40 albertel 76: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
1.19 albertel 77: #need to inspect this class of ops
78: # $safeeval->deny(":base_orig");
1.21 albertel 79: $safeinit .= ';$external::target='.$target.';';
1.26 albertel 80: $safeinit .= ';$external::randomseed='.&Apache::lonnet::rndseed().';';
1.21 albertel 81: &Apache::run::run($safeinit,$safeeval);
1.3 sakharuk 82: #-------------------- Redefinition of the target in the case of compound target
83:
84: ($target, my @tenta) = split('&&',$target);
85:
86: my @stack = ();
87: my @parstack = ();
1.17 albertel 88: &initdepth;
1.3 sakharuk 89: my $token;
1.16 albertel 90: while ( $#pars > -1 ) {
91: while ($token = $pars[$#pars]->get_token) {
92: if ($token->[0] eq 'T') {
1.55 albertel 93: $result=$token->[1];
1.16 albertel 94: } elsif ($token->[0] eq 'S') {
95: # add tag to stack
96: push (@stack,$token->[1]);
97: # add parameters list to another stack
98: push (@parstack,&parstring($token));
1.19 albertel 99: &increasedepth($token);
1.16 albertel 100: if (exists $style_for_target{$token->[1]}) {
1.55 albertel 101: if ($Apache::lonxml::redirection) {
102: $Apache::lonxml::outputstack['-1'] .=
103: &recurse($style_for_target{$token->[1]},$target,$safeeval,
104: \%style_for_target,@parstack);
1.41 albertel 105: } else {
1.55 albertel 106: $finaloutput .= &recurse($style_for_target{$token->[1]},$target,
107: $safeeval,\%style_for_target,@parstack);
1.41 albertel 108: }
1.16 albertel 109: } else {
1.17 albertel 110: $result = &callsub("start_$token->[1]", $target, $token,\@parstack,
1.41 albertel 111: \@pars, $safeeval, \%style_for_target);
1.16 albertel 112: }
113: } elsif ($token->[0] eq 'E') {
114: #clear out any tags that didn't end
1.55 albertel 115: while ($token->[1] ne $stack[$#stack] && ($#stack > -1)) {
116: &Apache::lonxml::warning("Unbalanced tags in resource $stack['-1']");
1.43 albertel 117: pop @stack;pop @parstack;&decreasedepth($token);
118: }
1.16 albertel 119:
120: if (exists $style_for_target{'/'."$token->[1]"}) {
1.55 albertel 121: if ($Apache::lonxml::redirection) {
122: $Apache::lonxml::outputstack['-1'] .=
123: &recurse($style_for_target{'/'."$token->[1]"},
124: $target,$safeeval,\%style_for_target,@parstack);
125: } else {
126: $finaloutput .= &recurse($style_for_target{'/'."$token->[1]"},
127: $target,$safeeval,\%style_for_target,
128: @parstack);
129: }
130:
1.16 albertel 131: } else {
1.17 albertel 132: $result = &callsub("end_$token->[1]", $target, $token, \@parstack,
1.55 albertel 133: \@pars,$safeeval, \%style_for_target);
1.13 albertel 134: }
1.16 albertel 135: }
1.55 albertel 136: #evaluate variable refs in result
1.25 sakharuk 137: if ($result ne "") {
1.24 sakharuk 138: if ( $#parstack > -1 ) {
1.55 albertel 139: if ($Apache::lonxml::redirection) {
140: $Apache::lonxml::outputstack['-1'] .=
141: &Apache::run::evaluate($result,$safeeval,$parstack[$#parstack]);
142: } else {
143: $finaloutput .= &Apache::run::evaluate($result,$safeeval,
144: $parstack[$#parstack]);
145: }
1.16 albertel 146: } else {
147: $finaloutput .= &Apache::run::evaluate($result,$safeeval,'');
1.13 albertel 148: }
1.16 albertel 149: $result = '';
1.55 albertel 150: }
151: if ($token->[0] eq 'E') {
152: pop @stack;pop @parstack;&decreasedepth($token);
1.2 sakharuk 153: }
1.5 albertel 154: }
1.16 albertel 155: pop @pars;
1.23 albertel 156: pop @Apache::lonxml::pwd;
1.3 sakharuk 157: }
1.24 sakharuk 158:
1.3 sakharuk 159: return $finaloutput;
1.15 albertel 160: }
161:
162: sub recurse {
163:
164: my @innerstack = ();
165: my @innerparstack = ();
166: my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_;
1.16 albertel 167: my @pat = ();
1.23 albertel 168: &newparser(\@pat,\$newarg);
1.15 albertel 169: my $tokenpat;
170: my $partstring = '';
171: my $output='';
1.16 albertel 172: my $decls='';
173: while ( $#pat > -1 ) {
174: while ($tokenpat = $pat[$#pat]->get_token) {
175: if ($tokenpat->[0] eq 'T') {
1.55 albertel 176: $partstring = $tokenpat->[1];
1.16 albertel 177: } elsif ($tokenpat->[0] eq 'S') {
178: push (@innerstack,$tokenpat->[1]);
179: push (@innerparstack,&parstring($tokenpat));
1.19 albertel 180: &increasedepth($tokenpat);
1.16 albertel 181: $partstring = &callsub("start_$tokenpat->[1]",
182: $target, $tokenpat, \@innerparstack,
183: \@pat, $safeeval, $style_for_target);
184: } elsif ($tokenpat->[0] eq 'E') {
185: #clear out any tags that didn't end
186: while ($tokenpat->[1] ne $innerstack[$#innerstack]
1.43 albertel 187: && ($#innerstack > -1)) {
1.49 albertel 188: &Apache::lonxml::warning("Unbalanced tags in resource $innerstack['-1']");
1.43 albertel 189: pop @innerstack;pop @innerparstack;&decreasedepth($tokenpat);
190: }
1.16 albertel 191: $partstring = &callsub("end_$tokenpat->[1]",
192: $target, $tokenpat, \@innerparstack,
193: \@pat, $safeeval, $style_for_target);
194: }
195: #pass both the variable to the style tag, and the tag we
196: #are processing inside the <definedtag>
197: if ( $partstring ne "" ) {
198: if ( $#parstack > -1 ) {
199: if ( $#innerparstack > -1 ) {
200: $decls= $parstack[$#parstack].$innerparstack[$#innerparstack];
201: } else {
202: $decls= $parstack[$#parstack];
203: }
204: } else {
205: if ( $#innerparstack > -1 ) {
206: $decls=$innerparstack[$#innerparstack];
207: } else {
208: $decls='';
209: }
210: }
211: $output .= &Apache::run::evaluate($partstring,$safeeval,$decls);
212: $partstring = '';
213: }
1.17 albertel 214: if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack;
1.19 albertel 215: &decreasedepth($tokenpat);}
1.15 albertel 216: }
1.16 albertel 217: pop @pat;
1.23 albertel 218: pop @Apache::lonxml::pwd;
1.15 albertel 219: }
220: return $output;
1.7 albertel 221: }
222:
223: sub callsub {
1.14 albertel 224: my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_;
1.7 albertel 225: my $currentstring='';
226: {
1.24 sakharuk 227: my $sub1;
1.7 albertel 228: no strict 'refs';
229: if (my $space=$Apache::lonxml::alltags{$token->[1]}) {
1.54 albertel 230: #&Apache::lonxml::debug("Calling sub $sub in $space<br />\n");
1.24 sakharuk 231: $sub1="$space\:\:$sub";
1.17 albertel 232: $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
1.24 sakharuk 233: $currentstring = &$sub1($target,$token,$parstack,$parser,
1.16 albertel 234: $safeeval,$style);
1.7 albertel 235: } else {
1.54 albertel 236: #&Apache::lonxml::debug("NOT Calling sub $sub in $space<br />\n");
1.7 albertel 237: if (defined($token->[4])) {
238: $currentstring = $token->[4];
239: } else {
240: $currentstring = $token->[2];
241: }
242: }
243: use strict 'refs';
244: }
245: return $currentstring;
1.17 albertel 246: }
247:
1.55 albertel 248: sub startredirection {
249: $Apache::lonxml::redirection++;
250: push (@Apache::lonxml::outputstack, '');
251: }
252:
253: sub endredirection {
254: if (!$Apache::lonxml::redirection) {
255: &Apache::lonxml::error("Endredirection was called, before a startredirection, perhaps you have unbalanced tags. Some debuggin information:".join ":",caller);
256: return '';
257: }
258: $Apache::lonxml::redirection--;
259: pop @Apache::lonxml::outputstack;
260: }
261:
1.17 albertel 262: sub initdepth {
263: @Apache::lonxml::depthcounter=();
264: $Apache::lonxml::depth=-1;
265: $Apache::lonxml::olddepth=-1;
266: }
267:
268: sub increasedepth {
1.19 albertel 269: my ($token) = @_;
1.17 albertel 270: $Apache::lonxml::depth++;
271: $Apache::lonxml::depthcounter[$Apache::lonxml::depth]++;
272: if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) {
273: $Apache::lonxml::olddepth=$Apache::lonxml::depth;
274: }
1.42 albertel 275: my $curdepth=join('_',@Apache::lonxml::depthcounter);
276: &Apache::lonxml::debug("s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n");
1.54 albertel 277: #print "<br />s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n";
1.17 albertel 278: }
279:
280: sub decreasedepth {
1.19 albertel 281: my ($token) = @_;
1.17 albertel 282: $Apache::lonxml::depth--;
1.36 albertel 283: if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) {
284: $#Apache::lonxml::depthcounter--;
285: $Apache::lonxml::olddepth=$Apache::lonxml::depth+1;
286: }
1.43 albertel 287: if ( $Apache::lonxml::depth < -1) {
1.49 albertel 288: &Apache::lonxml::warning("Unbalanced tags in resource");
1.43 albertel 289: $Apache::lonxml::depth='-1';
290: }
1.42 albertel 291: my $curdepth=join('_',@Apache::lonxml::depthcounter);
292: &Apache::lonxml::debug("e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n");
1.54 albertel 293: #print "<br />e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n";
1.1 sakharuk 294: }
1.19 albertel 295:
296: sub get_all_text {
297:
298: my($tag,$pars)= @_;
299: my $depth=0;
300: my $token;
301: my $result='';
1.24 sakharuk 302: my $tag=substr($tag,1); #strip the / off the tag
1.49 albertel 303: #&Apache::lonxml::debug("have:$tag:");
1.19 albertel 304: while (($depth >=0) && ($token = $pars->get_token)) {
1.49 albertel 305: #&Apache::lonxml::debug("token:$token->[0]:$depth:$token->[1]");
1.19 albertel 306: if ($token->[0] eq 'T') {
307: $result.=$token->[1];
308: } elsif ($token->[0] eq 'S') {
309: if ($token->[1] eq $tag) { $depth++; }
310: $result.=$token->[4];
311: } elsif ($token->[0] eq 'E') {
1.24 sakharuk 312: if ( $token->[1] eq $tag) { $depth--; }
1.19 albertel 313: #skip sending back the last end tag
1.36 albertel 314: if ($depth > -1) { $result.=$token->[2]; } else {
315: $pars->unget_token($token);
316: }
1.19 albertel 317: }
318: }
1.49 albertel 319: # &Apache::lonxml::debug("Exit:$result:");
1.19 albertel 320: return $result
321: }
322:
1.23 albertel 323: sub newparser {
324: my ($parser,$contentref,$dir) = @_;
325: push (@$parser,HTML::TokeParser->new($contentref));
1.56 ! albertel 326: $$parser['-1']->xml_mode('1');
1.23 albertel 327: if ( $dir eq '' ) {
328: push (@Apache::lonxml::pwd, $Apache::lonxml::pwd[$#Apache::lonxml::pwd]);
329: } else {
330: push (@Apache::lonxml::pwd, $dir);
331: }
332: # &Apache::lonxml::debug("pwd:$#Apache::lonxml::pwd");
333: # &Apache::lonxml::debug("pwd:$Apache::lonxml::pwd[$#Apache::lonxml::pwd]");
334: }
1.1 sakharuk 335:
1.8 albertel 336: sub parstring {
337: my ($token) = @_;
338: my $temp='';
1.20 albertel 339: map {
1.35 www 340: unless ($_=~/\W/) {
1.42 albertel 341: my $val=$token->[2]->{$_};
1.53 albertel 342: $val =~ s/([\%\@\\])/\\$1/g;
1.51 albertel 343: #if ($val =~ m/^[\%\@]/) { $val="\\".$val; }
1.42 albertel 344: $temp .= "my \$$_=\"$val\";"
1.20 albertel 345: }
346: } @{$token->[3]};
1.8 albertel 347: return $temp;
348: }
1.22 albertel 349:
1.34 www 350: sub writeallows {
351: my $thisurl='/res/'.&Apache::lonnet::declutter(shift);
352: my $thisdir=$thisurl;
353: $thisdir=~s/\/[^\/]+$//;
354: my %httpref=();
355: map {
356: $httpref{'httpref.'.
357: &Apache::lonnet::hreflocation($thisdir,$_)}=$thisurl; } @extlinks;
358: &Apache::lonnet::appenv(%httpref);
359: }
360:
1.24 sakharuk 361: sub handler {
362: my $request=shift;
1.44 albertel 363:
1.31 sakharuk 364: my $target='web';
1.48 albertel 365: $Apache::lonxml::debug=0;
1.25 sakharuk 366: if ($ENV{'browser.mathml'}) {
1.27 albertel 367: $request->content_type('text/xml');
368: } else {
369: $request->content_type('text/html');
1.25 sakharuk 370: }
1.29 sakharuk 371:
372: # $request->print(<<ENDHEADER);
373: #<html>
374: #<head>
375: #<title>Just test</title>
376: #</head>
377: #<body bgcolor="#FFFFFF">
378: #ENDHEADER
379: # &Apache::lonhomework::send_header($request);
1.27 albertel 380: $request->send_http_header;
381:
1.45 www 382: return OK if $request->header_only;
1.27 albertel 383:
384: $request->print(&Apache::lontexconvert::header());
385:
1.28 albertel 386: $request->print('<body bgcolor="#FFFFFF">'."\n");
1.27 albertel 387:
1.50 albertel 388: my $file=&Apache::lonnet::filelocation("",$request->uri);
1.24 sakharuk 389: my %mystyle;
1.50 albertel 390: my $result = '';
391: my $filecontents=&Apache::lonnet::getfile($file);
392: if ($filecontents == -1) {
393: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
394: $filecontents='';
395: } else {
396: $result = &Apache::lonxml::xmlparse($target,$filecontents,'',%mystyle);
397: }
1.24 sakharuk 398: $request->print($result);
1.29 sakharuk 399:
1.50 albertel 400:
1.28 albertel 401: $request->print('</body>');
402: $request->print(&Apache::lontexconvert::footer());
1.34 www 403: writeallows($request->uri);
1.45 www 404: return OK;
1.24 sakharuk 405: }
406:
1.22 albertel 407: $Apache::lonxml::debug=0;
408: sub debug {
409: if ($Apache::lonxml::debug eq 1) {
1.54 albertel 410: print "DEBUG:".$_[0]."<br />\n";
1.22 albertel 411: }
412: }
1.49 albertel 413:
1.22 albertel 414: sub error {
1.52 albertel 415: if ($Apache::lonxml::debug eq 1) {
1.55 albertel 416: print "<b>ERROR:</b>".$_[0]."<br />\n";
1.52 albertel 417: } else {
418: print "<b>An Error occured while processing this resource. The instructor has been notified.</b> <br />";
419: #notify author
420: &Apache::lonmsg::author_res_msg($ENV{'request.filename'},$_[0]);
421: #notify course
422: if ( $ENV{'request.course.id'} ) {
423: my $users=$ENV{'course.'.$ENV{'request.course.id'}.'.comment.email'};
424: foreach my $user (split /\,/, $users) {
425: ($user,my $domain) = split /:/, $user;
1.54 albertel 426: &Apache::lonmsg::user_normal_msg($user,$domain,"Error in $ENV{'request.filename'}",$_[0]);
1.52 albertel 427: }
428: }
429:
430: #FIXME probably shouldn't have me get everything forever.
1.54 albertel 431: &Apache::lonmsg::user_normal_msg('albertel','msu',"Error in $ENV{'request.filename'}",$_[0]);
432: #&Apache::lonmsg::user_normal_msg('albertel','103',"Error in $ENV{'request.filename'}",$_[0]);
1.52 albertel 433: }
1.22 albertel 434: }
1.49 albertel 435:
1.22 albertel 436: sub warning {
437: if ($Apache::lonxml::debug eq 1) {
1.55 albertel 438: print "<b>W</b>ARNING<b>:</b>".$_[0]."<br />\n";
1.22 albertel 439: }
440: }
441:
1.1 sakharuk 442: 1;
443: __END__
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