Annotation of loncom/xml/lonxml.pm, revision 1.62
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
1.60 albertel 11: qw(@pwd @outputstack $redirection $import @extlinks $metamode);
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;
1.59 albertel 40: use Apache::edit;
1.3 sakharuk 41: #================================================== Main subroutine: xmlparse
1.33 www 42: @pwd=();
1.55 albertel 43: @outputstack = ();
44: $redirection = 0;
45: $import = 1;
1.33 www 46: @extlinks=();
1.59 albertel 47: $metamode = 0;
1.31 sakharuk 48:
1.3 sakharuk 49: sub xmlparse {
50:
1.18 albertel 51: my ($target,$content_file_string,$safeinit,%style_for_target) = @_;
1.41 albertel 52: if ($target eq 'meta') {
1.59 albertel 53: # meta mode is a bit weird only some output is to be turned off
1.60 albertel 54: #<output> tag turns metamode off (defined in londefdef.pm)
1.59 albertel 55: $Apache::lonxml::redirection = 0;
56: $Apache::lonxml::metamode = 1;
1.55 albertel 57: $Apache::lonxml::import = 0;
1.47 albertel 58: } elsif ($target eq 'grade') {
1.55 albertel 59: &startredirection;
1.59 albertel 60: $Apache::lonxml::metamode = 0;
1.55 albertel 61: $Apache::lonxml::import = 1;
1.44 albertel 62: } else {
1.59 albertel 63: $Apache::lonxml::metamode = 0;
1.55 albertel 64: $Apache::lonxml::redirection = 0;
65: $Apache::lonxml::import = 1;
1.32 sakharuk 66: }
1.48 albertel 67: #&printalltags();
1.16 albertel 68: my @pars = ();
1.23 albertel 69: @Apache::lonxml::pwd=();
70: my $pwd=$ENV{'request.filename'};
71: $pwd =~ s:/[^/]*$::;
72: &newparser(\@pars,\$content_file_string,$pwd);
1.3 sakharuk 73: my $currentstring = '';
74: my $finaloutput = '';
75: my $newarg = '';
1.16 albertel 76: my $result;
1.24 sakharuk 77:
1.3 sakharuk 78: my $safeeval = new Safe;
1.40 albertel 79: my $safehole = new Safe::Hole;
1.6 albertel 80: $safeeval->permit("entereval");
1.13 albertel 81: $safeeval->permit(":base_math");
1.19 albertel 82: $safeeval->deny(":base_io");
1.40 albertel 83: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
1.19 albertel 84: #need to inspect this class of ops
85: # $safeeval->deny(":base_orig");
1.21 albertel 86: $safeinit .= ';$external::target='.$target.';';
1.26 albertel 87: $safeinit .= ';$external::randomseed='.&Apache::lonnet::rndseed().';';
1.21 albertel 88: &Apache::run::run($safeinit,$safeeval);
1.3 sakharuk 89: #-------------------- Redefinition of the target in the case of compound target
90:
91: ($target, my @tenta) = split('&&',$target);
92:
93: my @stack = ();
94: my @parstack = ();
1.17 albertel 95: &initdepth;
1.3 sakharuk 96: my $token;
1.16 albertel 97: while ( $#pars > -1 ) {
98: while ($token = $pars[$#pars]->get_token) {
1.57 albertel 99: if (($token->[0] eq 'T') || ($token->[0] eq 'C') || ($token->[0] eq 'D') ) {
1.61 albertel 100: if ($metamode<1) { $result=$token->[1]; }
1.57 albertel 101: } elsif ($token->[0] eq 'PI') {
1.61 albertel 102: if ($metamode<1) { $result=$token->[2]; }
1.16 albertel 103: } elsif ($token->[0] eq 'S') {
104: # add tag to stack
105: push (@stack,$token->[1]);
106: # add parameters list to another stack
107: push (@parstack,&parstring($token));
1.19 albertel 108: &increasedepth($token);
1.16 albertel 109: if (exists $style_for_target{$token->[1]}) {
1.61 albertel 110: if ($Apache::lonxml::redirection) {
1.55 albertel 111: $Apache::lonxml::outputstack['-1'] .=
112: &recurse($style_for_target{$token->[1]},$target,$safeeval,
113: \%style_for_target,@parstack);
1.41 albertel 114: } else {
1.55 albertel 115: $finaloutput .= &recurse($style_for_target{$token->[1]},$target,
116: $safeeval,\%style_for_target,@parstack);
1.41 albertel 117: }
1.16 albertel 118: } else {
1.17 albertel 119: $result = &callsub("start_$token->[1]", $target, $token,\@parstack,
1.41 albertel 120: \@pars, $safeeval, \%style_for_target);
1.16 albertel 121: }
122: } elsif ($token->[0] eq 'E') {
123: #clear out any tags that didn't end
1.55 albertel 124: while ($token->[1] ne $stack[$#stack] && ($#stack > -1)) {
125: &Apache::lonxml::warning("Unbalanced tags in resource $stack['-1']");
1.43 albertel 126: pop @stack;pop @parstack;&decreasedepth($token);
127: }
1.16 albertel 128:
129: if (exists $style_for_target{'/'."$token->[1]"}) {
1.61 albertel 130: if ($Apache::lonxml::redirection) {
1.55 albertel 131: $Apache::lonxml::outputstack['-1'] .=
132: &recurse($style_for_target{'/'."$token->[1]"},
133: $target,$safeeval,\%style_for_target,@parstack);
134: } else {
135: $finaloutput .= &recurse($style_for_target{'/'."$token->[1]"},
136: $target,$safeeval,\%style_for_target,
137: @parstack);
138: }
1.59 albertel 139:
1.16 albertel 140: } else {
1.17 albertel 141: $result = &callsub("end_$token->[1]", $target, $token, \@parstack,
1.55 albertel 142: \@pars,$safeeval, \%style_for_target);
1.13 albertel 143: }
1.57 albertel 144: } else {
145: &Apache::lonxml::error("Unknown token event :$token->[0]:$token->[1]:");
1.16 albertel 146: }
1.55 albertel 147: #evaluate variable refs in result
1.25 sakharuk 148: if ($result ne "") {
1.24 sakharuk 149: if ( $#parstack > -1 ) {
1.55 albertel 150: if ($Apache::lonxml::redirection) {
151: $Apache::lonxml::outputstack['-1'] .=
152: &Apache::run::evaluate($result,$safeeval,$parstack[$#parstack]);
153: } else {
154: $finaloutput .= &Apache::run::evaluate($result,$safeeval,
155: $parstack[$#parstack]);
156: }
1.16 albertel 157: } else {
158: $finaloutput .= &Apache::run::evaluate($result,$safeeval,'');
1.13 albertel 159: }
1.16 albertel 160: $result = '';
1.55 albertel 161: }
162: if ($token->[0] eq 'E') {
163: pop @stack;pop @parstack;&decreasedepth($token);
1.2 sakharuk 164: }
1.5 albertel 165: }
1.16 albertel 166: pop @pars;
1.23 albertel 167: pop @Apache::lonxml::pwd;
1.3 sakharuk 168: }
1.24 sakharuk 169:
1.59 albertel 170: # if ($target eq 'meta') {
171: # $finaloutput.=&endredirection;
172: # }
1.3 sakharuk 173: return $finaloutput;
1.15 albertel 174: }
175:
176: sub recurse {
177:
178: my @innerstack = ();
179: my @innerparstack = ();
180: my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_;
1.16 albertel 181: my @pat = ();
1.23 albertel 182: &newparser(\@pat,\$newarg);
1.15 albertel 183: my $tokenpat;
184: my $partstring = '';
185: my $output='';
1.16 albertel 186: my $decls='';
187: while ( $#pat > -1 ) {
188: while ($tokenpat = $pat[$#pat]->get_token) {
1.57 albertel 189: if (($tokenpat->[0] eq 'T') || ($tokenpat->[0] eq 'C') || ($tokenpat->[0] eq 'D') ) {
1.61 albertel 190: if ($metamode<1) { $partstring=$tokenpat->[1]; }
1.57 albertel 191: } elsif ($tokenpat->[0] eq 'PI') {
1.61 albertel 192: if ($metamode<1) { $partstring=$tokenpat->[2]; }
1.16 albertel 193: } elsif ($tokenpat->[0] eq 'S') {
194: push (@innerstack,$tokenpat->[1]);
195: push (@innerparstack,&parstring($tokenpat));
1.19 albertel 196: &increasedepth($tokenpat);
1.16 albertel 197: $partstring = &callsub("start_$tokenpat->[1]",
198: $target, $tokenpat, \@innerparstack,
199: \@pat, $safeeval, $style_for_target);
200: } elsif ($tokenpat->[0] eq 'E') {
201: #clear out any tags that didn't end
202: while ($tokenpat->[1] ne $innerstack[$#innerstack]
1.43 albertel 203: && ($#innerstack > -1)) {
1.49 albertel 204: &Apache::lonxml::warning("Unbalanced tags in resource $innerstack['-1']");
1.43 albertel 205: pop @innerstack;pop @innerparstack;&decreasedepth($tokenpat);
206: }
1.16 albertel 207: $partstring = &callsub("end_$tokenpat->[1]",
208: $target, $tokenpat, \@innerparstack,
209: \@pat, $safeeval, $style_for_target);
1.57 albertel 210: } else {
211: &Apache::lonxml::error("Unknown token event :$tokenpat->[0]:$tokenpat->[1]:");
1.16 albertel 212: }
213: #pass both the variable to the style tag, and the tag we
214: #are processing inside the <definedtag>
215: if ( $partstring ne "" ) {
216: if ( $#parstack > -1 ) {
217: if ( $#innerparstack > -1 ) {
218: $decls= $parstack[$#parstack].$innerparstack[$#innerparstack];
219: } else {
220: $decls= $parstack[$#parstack];
221: }
222: } else {
223: if ( $#innerparstack > -1 ) {
224: $decls=$innerparstack[$#innerparstack];
225: } else {
226: $decls='';
227: }
228: }
229: $output .= &Apache::run::evaluate($partstring,$safeeval,$decls);
230: $partstring = '';
231: }
1.17 albertel 232: if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack;
1.19 albertel 233: &decreasedepth($tokenpat);}
1.15 albertel 234: }
1.16 albertel 235: pop @pat;
1.23 albertel 236: pop @Apache::lonxml::pwd;
1.15 albertel 237: }
238: return $output;
1.7 albertel 239: }
240:
241: sub callsub {
1.14 albertel 242: my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_;
1.7 albertel 243: my $currentstring='';
244: {
1.59 albertel 245: my $sub1;
1.7 albertel 246: no strict 'refs';
1.59 albertel 247: if ($target eq 'edit' && $token->[0] eq 'S') {
248: $currentstring = &Apache::edit::tag_start($target,$token,$parstack,$parser,
249: $safeeval,$style);
250: }
1.7 albertel 251: if (my $space=$Apache::lonxml::alltags{$token->[1]}) {
1.62 ! sakharuk 252: &Apache::lonxml::debug("Calling sub $sub in $space $metamode<br />\n");
1.24 sakharuk 253: $sub1="$space\:\:$sub";
1.17 albertel 254: $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
1.59 albertel 255: $currentstring .= &$sub1($target,$token,$parstack,$parser,
1.16 albertel 256: $safeeval,$style);
1.7 albertel 257: } else {
1.62 ! sakharuk 258: &Apache::lonxml::debug("NOT Calling sub $sub in $space $metamode<br />\n");
! 259: if ($metamode <1) {
! 260: if (defined($token->[4]) && ($metamode < 1)) {
! 261: $currentstring .= $token->[4];
! 262: } else {
! 263: $currentstring .= $token->[2];
! 264: }
1.7 albertel 265: }
1.59 albertel 266: }
267: if ($target eq 'edit' && $token->[0] eq 'E') {
1.61 albertel 268: $currentstring .= &Apache::edit::tag_end($target,$token,$parstack,$parser,
1.59 albertel 269: $safeeval,$style);
1.7 albertel 270: }
271: use strict 'refs';
272: }
273: return $currentstring;
1.17 albertel 274: }
275:
1.55 albertel 276: sub startredirection {
277: $Apache::lonxml::redirection++;
278: push (@Apache::lonxml::outputstack, '');
279: }
280:
281: sub endredirection {
282: if (!$Apache::lonxml::redirection) {
283: &Apache::lonxml::error("Endredirection was called, before a startredirection, perhaps you have unbalanced tags. Some debuggin information:".join ":",caller);
284: return '';
285: }
286: $Apache::lonxml::redirection--;
287: pop @Apache::lonxml::outputstack;
288: }
289:
1.17 albertel 290: sub initdepth {
291: @Apache::lonxml::depthcounter=();
292: $Apache::lonxml::depth=-1;
293: $Apache::lonxml::olddepth=-1;
294: }
295:
296: sub increasedepth {
1.19 albertel 297: my ($token) = @_;
1.17 albertel 298: $Apache::lonxml::depth++;
299: $Apache::lonxml::depthcounter[$Apache::lonxml::depth]++;
300: if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) {
301: $Apache::lonxml::olddepth=$Apache::lonxml::depth;
302: }
1.42 albertel 303: my $curdepth=join('_',@Apache::lonxml::depthcounter);
304: &Apache::lonxml::debug("s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n");
1.54 albertel 305: #print "<br />s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n";
1.17 albertel 306: }
307:
308: sub decreasedepth {
1.19 albertel 309: my ($token) = @_;
1.17 albertel 310: $Apache::lonxml::depth--;
1.36 albertel 311: if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) {
312: $#Apache::lonxml::depthcounter--;
313: $Apache::lonxml::olddepth=$Apache::lonxml::depth+1;
314: }
1.43 albertel 315: if ( $Apache::lonxml::depth < -1) {
1.49 albertel 316: &Apache::lonxml::warning("Unbalanced tags in resource");
1.43 albertel 317: $Apache::lonxml::depth='-1';
318: }
1.42 albertel 319: my $curdepth=join('_',@Apache::lonxml::depthcounter);
320: &Apache::lonxml::debug("e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n");
1.54 albertel 321: #print "<br />e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n";
1.1 sakharuk 322: }
1.19 albertel 323:
324: sub get_all_text {
325:
326: my($tag,$pars)= @_;
327: my $depth=0;
328: my $token;
329: my $result='';
1.57 albertel 330: if ( $tag =~ m:^/: ) {
331: my $tag=substr($tag,1);
332: # &Apache::lonxml::debug("have:$tag:");
333: while (($depth >=0) && ($token = $pars->get_token)) {
334: # &Apache::lonxml::debug("e token:$token->[0]:$depth:$token->[1]");
335: if (($token->[0] eq 'T')||($token->[0] eq 'C')||($token->[0] eq 'D')) {
336: $result.=$token->[1];
337: } elsif ($token->[0] eq 'PI') {
338: $result.=$token->[2];
339: } elsif ($token->[0] eq 'S') {
340: if ($token->[1] eq $tag) { $depth++; }
341: $result.=$token->[4];
342: } elsif ($token->[0] eq 'E') {
343: if ( $token->[1] eq $tag) { $depth--; }
344: #skip sending back the last end tag
345: if ($depth > -1) { $result.=$token->[2]; } else {
346: $pars->unget_token($token);
347: }
348: }
349: }
350: } else {
351: while ($token = $pars->get_token) {
352: # &Apache::lonxml::debug("s token:$token->[0]:$depth:$token->[1]");
353: if (($token->[0] eq 'T')||($token->[0] eq 'C')||($token->[0] eq 'D')) {
354: $result.=$token->[1];
355: } elsif ($token->[0] eq 'PI') {
356: $result.=$token->[2];
357: } elsif ($token->[0] eq 'S') {
358: if ( $token->[1] eq $tag) {
359: $pars->unget_token($token); last;
360: } else {
361: $result.=$token->[4];
362: }
363: } elsif ($token->[0] eq 'E') {
364: $result.=$token->[2];
1.36 albertel 365: }
1.19 albertel 366: }
367: }
1.49 albertel 368: # &Apache::lonxml::debug("Exit:$result:");
1.19 albertel 369: return $result
370: }
371:
1.23 albertel 372: sub newparser {
373: my ($parser,$contentref,$dir) = @_;
374: push (@$parser,HTML::TokeParser->new($contentref));
1.56 albertel 375: $$parser['-1']->xml_mode('1');
1.23 albertel 376: if ( $dir eq '' ) {
377: push (@Apache::lonxml::pwd, $Apache::lonxml::pwd[$#Apache::lonxml::pwd]);
378: } else {
379: push (@Apache::lonxml::pwd, $dir);
380: }
381: # &Apache::lonxml::debug("pwd:$#Apache::lonxml::pwd");
382: # &Apache::lonxml::debug("pwd:$Apache::lonxml::pwd[$#Apache::lonxml::pwd]");
383: }
1.1 sakharuk 384:
1.8 albertel 385: sub parstring {
386: my ($token) = @_;
387: my $temp='';
1.20 albertel 388: map {
1.35 www 389: unless ($_=~/\W/) {
1.42 albertel 390: my $val=$token->[2]->{$_};
1.53 albertel 391: $val =~ s/([\%\@\\])/\\$1/g;
1.51 albertel 392: #if ($val =~ m/^[\%\@]/) { $val="\\".$val; }
1.42 albertel 393: $temp .= "my \$$_=\"$val\";"
1.20 albertel 394: }
395: } @{$token->[3]};
1.8 albertel 396: return $temp;
397: }
1.22 albertel 398:
1.34 www 399: sub writeallows {
400: my $thisurl='/res/'.&Apache::lonnet::declutter(shift);
401: my $thisdir=$thisurl;
402: $thisdir=~s/\/[^\/]+$//;
403: my %httpref=();
404: map {
405: $httpref{'httpref.'.
406: &Apache::lonnet::hreflocation($thisdir,$_)}=$thisurl; } @extlinks;
407: &Apache::lonnet::appenv(%httpref);
408: }
409:
1.24 sakharuk 410: sub handler {
411: my $request=shift;
1.44 albertel 412:
1.31 sakharuk 413: my $target='web';
1.48 albertel 414: $Apache::lonxml::debug=0;
1.25 sakharuk 415: if ($ENV{'browser.mathml'}) {
1.27 albertel 416: $request->content_type('text/xml');
417: } else {
418: $request->content_type('text/html');
1.25 sakharuk 419: }
1.29 sakharuk 420:
421: # $request->print(<<ENDHEADER);
422: #<html>
423: #<head>
424: #<title>Just test</title>
425: #</head>
426: #<body bgcolor="#FFFFFF">
427: #ENDHEADER
428: # &Apache::lonhomework::send_header($request);
1.27 albertel 429: $request->send_http_header;
430:
1.45 www 431: return OK if $request->header_only;
1.27 albertel 432:
433: $request->print(&Apache::lontexconvert::header());
434:
1.28 albertel 435: $request->print('<body bgcolor="#FFFFFF">'."\n");
1.27 albertel 436:
1.50 albertel 437: my $file=&Apache::lonnet::filelocation("",$request->uri);
1.24 sakharuk 438: my %mystyle;
1.50 albertel 439: my $result = '';
440: my $filecontents=&Apache::lonnet::getfile($file);
441: if ($filecontents == -1) {
442: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
443: $filecontents='';
444: } else {
445: $result = &Apache::lonxml::xmlparse($target,$filecontents,'',%mystyle);
446: }
1.24 sakharuk 447: $request->print($result);
1.29 sakharuk 448:
1.50 albertel 449:
1.28 albertel 450: $request->print('</body>');
451: $request->print(&Apache::lontexconvert::footer());
1.34 www 452: writeallows($request->uri);
1.45 www 453: return OK;
1.24 sakharuk 454: }
455:
1.22 albertel 456: $Apache::lonxml::debug=0;
457: sub debug {
458: if ($Apache::lonxml::debug eq 1) {
1.54 albertel 459: print "DEBUG:".$_[0]."<br />\n";
1.22 albertel 460: }
461: }
1.49 albertel 462:
1.22 albertel 463: sub error {
1.52 albertel 464: if ($Apache::lonxml::debug eq 1) {
1.55 albertel 465: print "<b>ERROR:</b>".$_[0]."<br />\n";
1.52 albertel 466: } else {
467: print "<b>An Error occured while processing this resource. The instructor has been notified.</b> <br />";
468: #notify author
469: &Apache::lonmsg::author_res_msg($ENV{'request.filename'},$_[0]);
470: #notify course
471: if ( $ENV{'request.course.id'} ) {
472: my $users=$ENV{'course.'.$ENV{'request.course.id'}.'.comment.email'};
473: foreach my $user (split /\,/, $users) {
474: ($user,my $domain) = split /:/, $user;
1.54 albertel 475: &Apache::lonmsg::user_normal_msg($user,$domain,"Error in $ENV{'request.filename'}",$_[0]);
1.52 albertel 476: }
477: }
478:
479: #FIXME probably shouldn't have me get everything forever.
1.54 albertel 480: &Apache::lonmsg::user_normal_msg('albertel','msu',"Error in $ENV{'request.filename'}",$_[0]);
481: #&Apache::lonmsg::user_normal_msg('albertel','103',"Error in $ENV{'request.filename'}",$_[0]);
1.52 albertel 482: }
1.22 albertel 483: }
1.49 albertel 484:
1.22 albertel 485: sub warning {
486: if ($Apache::lonxml::debug eq 1) {
1.55 albertel 487: print "<b>W</b>ARNING<b>:</b>".$_[0]."<br />\n";
1.22 albertel 488: }
489: }
490:
1.1 sakharuk 491: 1;
492: __END__
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