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- <meta> mode changes - start on edit stuff
1: # The LearningOnline Network with CAPA 2: # XML Parser Module 3: # 4: # last modified 06/26/00 by Alexander Sakharuk 5: # 11/6 Gerd Kortemeyer 6: # 6/1/1 Gerd Kortemeyer 7: # 2/21,3/13 Guy 8: 9: package Apache::lonxml; 10: use vars 11: qw(@pwd @outputstack $redirection $textredirection $import @extlinks $metamode); 12: use strict; 13: use HTML::TokeParser; 14: use Safe; 15: use Safe::Hole; 16: use Opcode; 17: use Apache::Constants qw(:common); 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: } 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: } 35: use Apache::style; 36: use Apache::lontexconvert; 37: use Apache::run; 38: use Apache::londefdef; 39: use Apache::scripttag; 40: use Apache::edit; 41: #================================================== Main subroutine: xmlparse 42: @pwd=(); 43: @outputstack = (); 44: $redirection = 0; 45: $import = 1; 46: @extlinks=(); 47: $metamode = 0; 48: 49: sub xmlparse { 50: 51: my ($target,$content_file_string,$safeinit,%style_for_target) = @_; 52: if ($target eq 'meta') { 53: # meta mode is a bit weird only some output is to be turned off 54: $Apache::lonxml::redirection = 0; 55: $Apache::lonxml::metamode = 1; 56: $Apache::lonxml::import = 0; 57: } elsif ($target eq 'grade') { 58: &startredirection; 59: $Apache::lonxml::metamode = 0; 60: $Apache::lonxml::import = 1; 61: } else { 62: $Apache::lonxml::metamode = 0; 63: $Apache::lonxml::redirection = 0; 64: $Apache::lonxml::import = 1; 65: } 66: #&printalltags(); 67: my @pars = (); 68: @Apache::lonxml::pwd=(); 69: my $pwd=$ENV{'request.filename'}; 70: $pwd =~ s:/[^/]*$::; 71: &newparser(\@pars,\$content_file_string,$pwd); 72: my $currentstring = ''; 73: my $finaloutput = ''; 74: my $newarg = ''; 75: my $result; 76: 77: my $safeeval = new Safe; 78: my $safehole = new Safe::Hole; 79: $safeeval->permit("entereval"); 80: $safeeval->permit(":base_math"); 81: $safeeval->deny(":base_io"); 82: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT'); 83: #need to inspect this class of ops 84: # $safeeval->deny(":base_orig"); 85: $safeinit .= ';$external::target='.$target.';'; 86: $safeinit .= ';$external::randomseed='.&Apache::lonnet::rndseed().';'; 87: &Apache::run::run($safeinit,$safeeval); 88: #-------------------- Redefinition of the target in the case of compound target 89: 90: ($target, my @tenta) = split('&&',$target); 91: 92: my @stack = (); 93: my @parstack = (); 94: &initdepth; 95: my $token; 96: while ( $#pars > -1 ) { 97: while ($token = $pars[$#pars]->get_token) { 98: if (($token->[0] eq 'T') || ($token->[0] eq 'C') || ($token->[0] eq 'D') ) { 99: if (!$metamode) { $result=$token->[1]; } 100: } elsif ($token->[0] eq 'PI') { 101: if (!$metamode) { $result=$token->[2]; } 102: } elsif ($token->[0] eq 'S') { 103: # add tag to stack 104: push (@stack,$token->[1]); 105: # add parameters list to another stack 106: push (@parstack,&parstring($token)); 107: &increasedepth($token); 108: if (exists $style_for_target{$token->[1]}) { 109: if ($metamode) { 110: $result = $style_for_target{$token->[1]}; 111: } elsif ($Apache::lonxml::redirection) { 112: $Apache::lonxml::outputstack['-1'] .= 113: &recurse($style_for_target{$token->[1]},$target,$safeeval, 114: \%style_for_target,@parstack); 115: } else { 116: $finaloutput .= &recurse($style_for_target{$token->[1]},$target, 117: $safeeval,\%style_for_target,@parstack); 118: } 119: } else { 120: $result = &callsub("start_$token->[1]", $target, $token,\@parstack, 121: \@pars, $safeeval, \%style_for_target); 122: } 123: } elsif ($token->[0] eq 'E') { 124: #clear out any tags that didn't end 125: while ($token->[1] ne $stack[$#stack] && ($#stack > -1)) { 126: &Apache::lonxml::warning("Unbalanced tags in resource $stack['-1']"); 127: pop @stack;pop @parstack;&decreasedepth($token); 128: } 129: 130: if (exists $style_for_target{'/'."$token->[1]"}) { 131: if ($metamode) { 132: $result = $style_for_target{$token->[1]}; 133: } elsif ($Apache::lonxml::redirection) { 134: $Apache::lonxml::outputstack['-1'] .= 135: &recurse($style_for_target{'/'."$token->[1]"}, 136: $target,$safeeval,\%style_for_target,@parstack); 137: } else { 138: $finaloutput .= &recurse($style_for_target{'/'."$token->[1]"}, 139: $target,$safeeval,\%style_for_target, 140: @parstack); 141: } 142: 143: } else { 144: $result = &callsub("end_$token->[1]", $target, $token, \@parstack, 145: \@pars,$safeeval, \%style_for_target); 146: } 147: } else { 148: &Apache::lonxml::error("Unknown token event :$token->[0]:$token->[1]:"); 149: } 150: #evaluate variable refs in result 151: if ($result ne "") { 152: if ( $#parstack > -1 ) { 153: if ($Apache::lonxml::redirection) { 154: $Apache::lonxml::outputstack['-1'] .= 155: &Apache::run::evaluate($result,$safeeval,$parstack[$#parstack]); 156: } else { 157: $finaloutput .= &Apache::run::evaluate($result,$safeeval, 158: $parstack[$#parstack]); 159: } 160: } else { 161: $finaloutput .= &Apache::run::evaluate($result,$safeeval,''); 162: } 163: $result = ''; 164: } 165: if ($token->[0] eq 'E') { 166: pop @stack;pop @parstack;&decreasedepth($token); 167: } 168: } 169: pop @pars; 170: pop @Apache::lonxml::pwd; 171: } 172: 173: # if ($target eq 'meta') { 174: # $finaloutput.=&endredirection; 175: # } 176: return $finaloutput; 177: } 178: 179: sub recurse { 180: 181: my @innerstack = (); 182: my @innerparstack = (); 183: my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_; 184: my @pat = (); 185: &newparser(\@pat,\$newarg); 186: my $tokenpat; 187: my $partstring = ''; 188: my $output=''; 189: my $decls=''; 190: while ( $#pat > -1 ) { 191: while ($tokenpat = $pat[$#pat]->get_token) { 192: if (($tokenpat->[0] eq 'T') || ($tokenpat->[0] eq 'C') || ($tokenpat->[0] eq 'D') ) { 193: $partstring = $tokenpat->[1]; 194: } elsif ($tokenpat->[0] eq 'PI') { 195: $partstring = $tokenpat->[2]; 196: } elsif ($tokenpat->[0] eq 'S') { 197: push (@innerstack,$tokenpat->[1]); 198: push (@innerparstack,&parstring($tokenpat)); 199: &increasedepth($tokenpat); 200: $partstring = &callsub("start_$tokenpat->[1]", 201: $target, $tokenpat, \@innerparstack, 202: \@pat, $safeeval, $style_for_target); 203: } elsif ($tokenpat->[0] eq 'E') { 204: #clear out any tags that didn't end 205: while ($tokenpat->[1] ne $innerstack[$#innerstack] 206: && ($#innerstack > -1)) { 207: &Apache::lonxml::warning("Unbalanced tags in resource $innerstack['-1']"); 208: pop @innerstack;pop @innerparstack;&decreasedepth($tokenpat); 209: } 210: $partstring = &callsub("end_$tokenpat->[1]", 211: $target, $tokenpat, \@innerparstack, 212: \@pat, $safeeval, $style_for_target); 213: } else { 214: &Apache::lonxml::error("Unknown token event :$tokenpat->[0]:$tokenpat->[1]:"); 215: } 216: #pass both the variable to the style tag, and the tag we 217: #are processing inside the <definedtag> 218: if ( $partstring ne "" ) { 219: if ( $#parstack > -1 ) { 220: if ( $#innerparstack > -1 ) { 221: $decls= $parstack[$#parstack].$innerparstack[$#innerparstack]; 222: } else { 223: $decls= $parstack[$#parstack]; 224: } 225: } else { 226: if ( $#innerparstack > -1 ) { 227: $decls=$innerparstack[$#innerparstack]; 228: } else { 229: $decls=''; 230: } 231: } 232: $output .= &Apache::run::evaluate($partstring,$safeeval,$decls); 233: $partstring = ''; 234: } 235: if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack; 236: &decreasedepth($tokenpat);} 237: } 238: pop @pat; 239: pop @Apache::lonxml::pwd; 240: } 241: return $output; 242: } 243: 244: sub callsub { 245: my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_; 246: my $currentstring=''; 247: { 248: my $sub1; 249: no strict 'refs'; 250: if ($target eq 'edit' && $token->[0] eq 'S') { 251: $currentstring = &Apache::edit::tag_start($target,$token,$parstack,$parser, 252: $safeeval,$style); 253: } 254: if (my $space=$Apache::lonxml::alltags{$token->[1]}) { 255: #&Apache::lonxml::debug("Calling sub $sub in $space<br />\n"); 256: $sub1="$space\:\:$sub"; 257: $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter); 258: $currentstring .= &$sub1($target,$token,$parstack,$parser, 259: $safeeval,$style); 260: } else { 261: #&Apache::lonxml::debug("NOT Calling sub $sub in $space<br />\n"); 262: if (defined($token->[4]) && !$metamode) { 263: $currentstring .= $token->[4]; 264: } else { 265: $currentstring .= $token->[2]; 266: } 267: } 268: if ($target eq 'edit' && $token->[0] eq 'E') { 269: $currentstring = &Apache::edit::tag_end($target,$token,$parstack,$parser, 270: $safeeval,$style); 271: } 272: use strict 'refs'; 273: } 274: return $currentstring; 275: } 276: 277: sub startredirection { 278: $Apache::lonxml::redirection++; 279: push (@Apache::lonxml::outputstack, ''); 280: } 281: 282: sub endredirection { 283: if (!$Apache::lonxml::redirection) { 284: &Apache::lonxml::error("Endredirection was called, before a startredirection, perhaps you have unbalanced tags. Some debuggin information:".join ":",caller); 285: return ''; 286: } 287: $Apache::lonxml::redirection--; 288: pop @Apache::lonxml::outputstack; 289: } 290: 291: sub initdepth { 292: @Apache::lonxml::depthcounter=(); 293: $Apache::lonxml::depth=-1; 294: $Apache::lonxml::olddepth=-1; 295: } 296: 297: sub increasedepth { 298: my ($token) = @_; 299: $Apache::lonxml::depth++; 300: $Apache::lonxml::depthcounter[$Apache::lonxml::depth]++; 301: if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) { 302: $Apache::lonxml::olddepth=$Apache::lonxml::depth; 303: } 304: my $curdepth=join('_',@Apache::lonxml::depthcounter); 305: &Apache::lonxml::debug("s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n"); 306: #print "<br />s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n"; 307: } 308: 309: sub decreasedepth { 310: my ($token) = @_; 311: $Apache::lonxml::depth--; 312: if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) { 313: $#Apache::lonxml::depthcounter--; 314: $Apache::lonxml::olddepth=$Apache::lonxml::depth+1; 315: } 316: if ( $Apache::lonxml::depth < -1) { 317: &Apache::lonxml::warning("Unbalanced tags in resource"); 318: $Apache::lonxml::depth='-1'; 319: } 320: my $curdepth=join('_',@Apache::lonxml::depthcounter); 321: &Apache::lonxml::debug("e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n"); 322: #print "<br />e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n"; 323: } 324: 325: sub get_all_text { 326: 327: my($tag,$pars)= @_; 328: my $depth=0; 329: my $token; 330: my $result=''; 331: if ( $tag =~ m:^/: ) { 332: my $tag=substr($tag,1); 333: # &Apache::lonxml::debug("have:$tag:"); 334: while (($depth >=0) && ($token = $pars->get_token)) { 335: # &Apache::lonxml::debug("e token:$token->[0]:$depth:$token->[1]"); 336: if (($token->[0] eq 'T')||($token->[0] eq 'C')||($token->[0] eq 'D')) { 337: $result.=$token->[1]; 338: } elsif ($token->[0] eq 'PI') { 339: $result.=$token->[2]; 340: } elsif ($token->[0] eq 'S') { 341: if ($token->[1] eq $tag) { $depth++; } 342: $result.=$token->[4]; 343: } elsif ($token->[0] eq 'E') { 344: if ( $token->[1] eq $tag) { $depth--; } 345: #skip sending back the last end tag 346: if ($depth > -1) { $result.=$token->[2]; } else { 347: $pars->unget_token($token); 348: } 349: } 350: } 351: } else { 352: while ($token = $pars->get_token) { 353: # &Apache::lonxml::debug("s token:$token->[0]:$depth:$token->[1]"); 354: if (($token->[0] eq 'T')||($token->[0] eq 'C')||($token->[0] eq 'D')) { 355: $result.=$token->[1]; 356: } elsif ($token->[0] eq 'PI') { 357: $result.=$token->[2]; 358: } elsif ($token->[0] eq 'S') { 359: if ( $token->[1] eq $tag) { 360: $pars->unget_token($token); last; 361: } else { 362: $result.=$token->[4]; 363: } 364: } elsif ($token->[0] eq 'E') { 365: $result.=$token->[2]; 366: } 367: } 368: } 369: # &Apache::lonxml::debug("Exit:$result:"); 370: return $result 371: } 372: 373: sub newparser { 374: my ($parser,$contentref,$dir) = @_; 375: push (@$parser,HTML::TokeParser->new($contentref)); 376: $$parser['-1']->xml_mode('1'); 377: if ( $dir eq '' ) { 378: push (@Apache::lonxml::pwd, $Apache::lonxml::pwd[$#Apache::lonxml::pwd]); 379: } else { 380: push (@Apache::lonxml::pwd, $dir); 381: } 382: # &Apache::lonxml::debug("pwd:$#Apache::lonxml::pwd"); 383: # &Apache::lonxml::debug("pwd:$Apache::lonxml::pwd[$#Apache::lonxml::pwd]"); 384: } 385: 386: sub parstring { 387: my ($token) = @_; 388: my $temp=''; 389: map { 390: unless ($_=~/\W/) { 391: my $val=$token->[2]->{$_}; 392: $val =~ s/([\%\@\\])/\\$1/g; 393: #if ($val =~ m/^[\%\@]/) { $val="\\".$val; } 394: $temp .= "my \$$_=\"$val\";" 395: } 396: } @{$token->[3]}; 397: return $temp; 398: } 399: 400: sub writeallows { 401: my $thisurl='/res/'.&Apache::lonnet::declutter(shift); 402: my $thisdir=$thisurl; 403: $thisdir=~s/\/[^\/]+$//; 404: my %httpref=(); 405: map { 406: $httpref{'httpref.'. 407: &Apache::lonnet::hreflocation($thisdir,$_)}=$thisurl; } @extlinks; 408: &Apache::lonnet::appenv(%httpref); 409: } 410: 411: sub handler { 412: my $request=shift; 413: 414: my $target='web'; 415: $Apache::lonxml::debug=0; 416: if ($ENV{'browser.mathml'}) { 417: $request->content_type('text/xml'); 418: } else { 419: $request->content_type('text/html'); 420: } 421: 422: # $request->print(<<ENDHEADER); 423: #<html> 424: #<head> 425: #<title>Just test</title> 426: #</head> 427: #<body bgcolor="#FFFFFF"> 428: #ENDHEADER 429: # &Apache::lonhomework::send_header($request); 430: $request->send_http_header; 431: 432: return OK if $request->header_only; 433: 434: $request->print(&Apache::lontexconvert::header()); 435: 436: $request->print('<body bgcolor="#FFFFFF">'."\n"); 437: 438: my $file=&Apache::lonnet::filelocation("",$request->uri); 439: my %mystyle; 440: my $result = ''; 441: my $filecontents=&Apache::lonnet::getfile($file); 442: if ($filecontents == -1) { 443: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>"); 444: $filecontents=''; 445: } else { 446: $result = &Apache::lonxml::xmlparse($target,$filecontents,'',%mystyle); 447: } 448: $request->print($result); 449: 450: 451: $request->print('</body>'); 452: $request->print(&Apache::lontexconvert::footer()); 453: writeallows($request->uri); 454: return OK; 455: } 456: 457: $Apache::lonxml::debug=0; 458: sub debug { 459: if ($Apache::lonxml::debug eq 1) { 460: print "DEBUG:".$_[0]."<br />\n"; 461: } 462: } 463: 464: sub error { 465: if ($Apache::lonxml::debug eq 1) { 466: print "<b>ERROR:</b>".$_[0]."<br />\n"; 467: } else { 468: print "<b>An Error occured while processing this resource. The instructor has been notified.</b> <br />"; 469: #notify author 470: &Apache::lonmsg::author_res_msg($ENV{'request.filename'},$_[0]); 471: #notify course 472: if ( $ENV{'request.course.id'} ) { 473: my $users=$ENV{'course.'.$ENV{'request.course.id'}.'.comment.email'}; 474: foreach my $user (split /\,/, $users) { 475: ($user,my $domain) = split /:/, $user; 476: &Apache::lonmsg::user_normal_msg($user,$domain,"Error in $ENV{'request.filename'}",$_[0]); 477: } 478: } 479: 480: #FIXME probably shouldn't have me get everything forever. 481: &Apache::lonmsg::user_normal_msg('albertel','msu',"Error in $ENV{'request.filename'}",$_[0]); 482: #&Apache::lonmsg::user_normal_msg('albertel','103',"Error in $ENV{'request.filename'}",$_[0]); 483: } 484: } 485: 486: sub warning { 487: if ($Apache::lonxml::debug eq 1) { 488: print "<b>W</b>ARNING<b>:</b>".$_[0]."<br />\n"; 489: } 490: } 491: 492: 1; 493: __END__