Web.pm

   1 # $Id$
   2 # Common functions for HTML/XHTML output generation
   3 # Copyright (C) 2003 Jan Kratochvil <project-www.jankratochvil.net@jankratochvil.net>
   4 #
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; exactly version 2 of June 1991 is required
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program; if not, write to the Free Software
  16 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17
  18
  19 package My::Web;
  20 require 5.6.0;  # at least 'use warnings;' but we need some 5.6.0+ modules anyway
  21 our $VERSION=do { my @r=(q$Revision$=~/\d+/g); sprintf "%d.".("%03d"x$#r),@r; };
  22 our $CVS_ID=q$Id$;
  23 use strict;
  24 use warnings;
  25
  26 use Exporter;
  27 sub Wrequire ($);
  28 sub Wuse ($@);
  29 our $W;
  30 our @EXPORT=qw(&Wrequire &Wuse &a_href &a_href_cz &vskip &img &centerimg &rightimg $W &top_dir &top_dir_disk);
  31 our @ISA=qw(Exporter);
  32
  33 BEGIN
  34 {
  35         sub Wrequire ($)
  36         {
  37         my($file)=@_;
  38
  39 #               print STDERR "Wrequire $file\n";
  40                 $file=~s#/#::#g;
  41                 $file=~s/[.]pm$//;
  42                 my $class=$file;
  43                 $file=~s#::#/#g;
  44                 $file.=".pm";
  45                 my $aref=($W->{"packages_used"}{$Apache::Registry::curstash}||=[]);
  46                 push @$aref,$class
  47                                 if !{ map(($_=>1),@$aref) }->{$class};  # Prevent duplicated entries.
  48                 CORE::require $file;
  49                 1;      # Otherwise 'require' would already file above.
  50         }
  51
  52         sub Wuse ($@)
  53         {
  54         my($file,@list)=@_;
  55
  56 #               print STDERR "Wuse $file\n";
  57                 Wrequire $file;
  58                 local $Exporter::ExportLevel=$Exporter::ExportLevel+1;
  59                 $file->import(@list);
  60                 1;
  61         }
  62 }
  63
  64 BEGIN { Wuse 'WebConfig'; }     # for %WebConfig
  65 require CGI;    # for &escapeHTML
  66 require Image::Size;    # for &imgsize
  67 use File::Basename;     # &basename
  68 use Carp qw(cluck confess);
  69 use URI::Escape;
  70 require HTTP::BrowserDetect;
  71 require HTTP::Negotiate;
  72 require Geo::IP;
  73 require CGI;
  74
  75
  76 # Undo 'www/engine/httpd-restart' as it may use obsolete Perl for 'mod_perl'
  77 delete $ENV{"PERLLIB"};
  78 delete $ENV{"LD_LIBRARY_PATH"};
  79
  80
  81 #our $W;
  82                 # $W->{"title"}
  83                 # $W->{"head"}
  84                 # $W->{"head_css"}
  85                 # $W->{"force_charset"}
  86                 # %{$W->{"packages_used"}
  87                 # $W->{"heading_done"}
  88                 # $W->{"footer_passed"}
  89                 # %{$W->{"headers"}}
  90                 # %{$W->{"headers_lc"}} # maps lc($headers_key)=>$headers_key
  91                 # @{$W->{"packages_used"}{$Apache::Registry::curstash}}}
  92                 # %{$W->{"args"}}
  93
  94 sub init ($%)
  95 {
  96 my($class,%args)=@_;
  97
  98         my $packages_used_save=$W->{"packages_used"};
  99         $W={ %WebConfig,%args };        # override %WebConfig settings
 100         $W->{"packages_used"}=$packages_used_save;
 101
 102         $W->{"__PACKAGE__"}||="Apache::ROOT".$Apache::Registry::curstash;
 103
 104         $W->{"top_dir"}||=eval '$'.$W->{"__PACKAGE__"}.'::top_dir';
 105
 106         do { $W->{$_}=0  if !defined $W->{$_}; } for ("detect_ent");
 107         do { $W->{$_}=0  if !defined $W->{$_}; } for ("detect_js");
 108         do { $W->{$_}=1  if !defined $W->{$_}; } for ("have_css");      # AFAIK it does not hurt anyone.
 109         do { $W->{$_}=1  if !defined $W->{$_}; } for ("heading");
 110         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer");
 111         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_delimit");
 112         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_mailme");
 113         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_ids");
 114         do { $W->{$_}=1  if !defined $W->{$_}; } for ("indexme");
 115         do { $W->{$_}="" if !defined $W->{$_}; } for ("head");
 116         do { $W->{$_}="" if !defined $W->{$_}; } for ("head_css");
 117
 118         my $footer_any=0;
 119         for (qw(footer_mailme footer_ids)) {
 120                 $W->{$_}=0 if !$W->{"footer"};
 121                 $footer_any=1 if $W->{$_};
 122                 }
 123         $W->{"footer"}=0 if !$footer_any;
 124         $W->{"footer_delimit"}=0 if !$W->{"footer"};
 125
 126         $W->{"r"}=Apache->request();
 127
 128         $W->{"QUERY_STRING"}=$W->{"r"}->args() || "";
 129            if ($W->{"QUERY_STRING"}=~/[&]amp;have_ent/)
 130                 { $W->{"have_ent"}=0; }
 131         elsif ($W->{"QUERY_STRING"}=~    /[&]have_ent/)
 132                 { $W->{"have_ent"}=1; }
 133         else
 134                 { delete $W->{"have_ent"}; }
 135         if ($W->{"detect_ent"} && !defined $W->{"have_ent"} && $W->{"r"}->method() eq "GET") {
 136                 $W->{"head"}.='<meta http-equiv="Refresh" content="0; URL='
 137                                 .CGI::escapeHTML("http://".$W->{"r"}->hostname()."/".($W->{"r"}->uri()=~m#^/*(.*)$#)[0]
 138                                                 ."?".($W->{"QUERY_STRING"} || "detect_ent_glue=1").'&have_ent=detect')
 139                                 .'" />'."\n";
 140                 }
 141         $W->{"QUERY_STRING"}=~s/([&])amp;/$1/g;
 142         $W->{"r"}->args($W->{"QUERY_STRING"});
 143         $ENV{"QUERY_STRING"}=$W->{"QUERY_STRING"};
 144         # Do not: $W->{"r"}->args()
 145         # as it  parses only QUERY_STRING (not POST data).
 146         $W->{"args"}={ CGI->new()->Vars() };
 147
 148         do { $W->{$_}=$ENV{"HTTP_ACCEPT"} if !defined $W->{$_}; } for ("accept");
 149         do { $W->{$_}=$ENV{"HTTP_USER_AGENT"} if !defined $W->{$_}; } for ("user_agent");
 150
 151         $W->{"browser"}=HTTP::BrowserDetect->new($W->{"user_agent"});
 152
 153         if (!defined $W->{"have_style"}) {
 154                 $W->{"have_style"}=(!$W->{"browser"}->netscape() || $W->{"browser"}->major>4 ? 1 : 0);
 155                 }
 156
 157         $W->{"have_js"}=($W->{"args"}{"have_js"} ? 1 : 0);
 158         if ($W->{"detect_js"} && !$W->{"have_js"}) {
 159                 $W->{"head"}.='<script type="text/javascript" src="'.top_dir('/have_js.js.pl').'"></script>'."\n";
 160                 }
 161
 162         do { args_check(%$_) if $_; } for ($W->{"args_check"});
 163
 164         return $W;
 165 }
 166
 167 sub top_dir_disk ()
 168 {
 169         do { return $_ if $_; } for ($W->{"top_dir"});
 170         return $INC[0]; # fallback
 171 }
 172
 173 sub top_dir (;$)
 174 {
 175 my($in)=@_;
 176
 177         if (my $uri=$ENV{"REQUEST_URI"}) {
 178                 $uri.="Index" if $uri=~m#/$#;
 179                 if (defined $in) {
 180                         my($inpath,$inquery)=split /[?]/,$in,2;
 181                         $inpath=~tr///cs;
 182                         $uri=~tr///cs;
 183                         for (;;) {
 184                                 my($in1 ,$in2 )=($in =~m#^(/[^/]+)(/.*)$#);
 185                                 my($uri1,$uri2)=($uri=~m#^(/[^/]+)(/.*)$#);
 186                                 last if !defined $in1 || !defined $uri1 || $in1 ne $uri1;
 187                                 $in=$in2;
 188                                 $uri=$uri2;
 189                                 }
 190                         }
 191                 $uri=~s#^/*##;
 192                 $uri=~s#[^/]+#..#g;
 193                 $uri=File::Basename::dirname($uri);
 194                 my $r=$uri.(defined $in ? $in : "");
 195 #               1 while $r=~s#^[.]/##;
 196 #               $r="./$r" if $r=~m#^(?:?.*)$#;  # empty pathname?
 197                 return $r;
 198                 }
 199         return top_dir_disk().$in;
 200 }
 201
 202 sub fatal (;$);
 203
 204 sub args_check (%)
 205 {
 206 my(%tmpl)=@_;
 207
 208         while (my($name,$regex)=each(%tmpl)) {
 209                 my $name_html="Parameter <span class=\"quote\">".CGI::escapeHTML($name)."</span>";
 210                 $W->{"args"}{$name}="" if !defined $W->{"args"}{$name};
 211                 my $val=$W->{"args"}{$name};
 212                 $val="" if !defined $val;
 213                 fatal "$name_html <span class=\"quote\">".CGI::escapeHTML($val)."</span>"
 214                                                 ." does not match required regex <span class=\"quote\">".CGI::escapeHTML($regex)."</span> "
 215                                 if $regex ne "" && $val!~/$regex/;
 216                 }
 217 }
 218
 219 sub vskip (;$)
 220 {
 221 my($height)=@_;
 222
 223         return '<p'.(!defined $height ? "" : ' style="height: '.$height.';"').'>&nbsp;</p>'."\n";
 224 }
 225
 226 sub fatal (;$)
 227 {
 228 my($msg)=@_;
 229
 230         $msg="UNKNOWN" if !$msg;
 231
 232 #       heading(false/*title*/,false/*indexme*/);       # notitle is always safe, don't index the error message
 233         print "\n".vskip("3ex")."<hr /><h1 class=\"error\">FATAL ERROR: $msg!</h1>\n"
 234                         ."<p>You can report this problem's details to"
 235                         ." ".a_href("mailto:".$W->{"admin_mail"},"admin of this website").".</p>\n";
 236         footer();
 237 }
 238
 239 sub footer (;$)
 240 {
 241         exit 1 if $W->{"footer_passed"}++;      # deadlock prevention:
 242
 243         print vskip if $W->{"footer_delimit"};
 244
 245         if ($W->{"heading"}) {
 246                 do { &{$_}() if $_; } for ($W->{"footing_delimit"});
 247                 }
 248
 249         print "<hr />\n" if $W->{"footer"};
 250
 251         if ($W->{"footer_mailme"}) {
 252                 print '<form action="'.top_dir('/SendMsg.pl').'" method="post" onsubmit="'
 253                                 ."this.elements['msgscript'].value=this.elements['msghtml'].value;"
 254                                 ."this.elements['msghtml'].value='';"
 255                                 ."this.submit();"
 256                                 .'">'."\n";
 257                         print '<p align="right">'."\n";
 258                                 print '<input name="msgscript" type="hidden" />'."\n";
 259                                 print '<input name="msghtml" type="text" size="32" alt="Message" />'."\n";
 260                                 print '<input name="submit" type="submit" value="Quick Note" />'."\n";
 261                         print '</p>'."\n";
 262                 print '</form>'."\n";
 263                 }
 264
 265         if ($W->{"footer_ids"}) {
 266                 print '<p class="cvs-id">';
 267                 print join("<br />\n",map({ my $package=$_;
 268                         my $cvs_id=(eval('$'.$package."::CVS_ID")
 269 #                                       || $package     # debug
 270                                         );
 271                         if (!$cvs_id) {
 272                                 ();
 273                                 }
 274                         else {
 275                                 $cvs_id='$'.$cvs_id.'$';        # Eaten by 'q' operator.
 276                                 my @cvs_id_split=split / +/,$cvs_id;
 277                                 if (@cvs_id_split==8) {
 278                                         my $file=$package;
 279                                         $file=~s#::#/#g;
 280                                         my $ext;
 281                                         for (qw(.html.pl .pl .pm),"") {
 282                                                 $ext=$_;
 283                                                 last if -r top_dir_disk()."/$file$ext";
 284                                                 cluck "Class file $file not found" if !$ext;
 285                                                 }
 286                                         $file.=$ext;
 287                                         $cvs_id_split[2]=""
 288                                                         .a_href((map({ my $s=$_; $s=~s#/viewcvs/#$&~checkout~/#; $s; } $W->{"viewcvs"}))[0]."$file?rev=".$cvs_id_split[2],
 289                                                                         $cvs_id_split[2]);
 290                                         $cvs_id_split[1]=a_href($W->{"viewcvs"}.$file,
 291                                                         ($package!~/^Apache::/ ? $package : $cvs_id_split[1]));
 292                                         $cvs_id_split[5]=&{$W->{"cvs_id_author"}}($cvs_id_split[5]);
 293                                         }
 294                                 join " ",@cvs_id_split;
 295                                 }
 296                         } (
 297                                         $W->{"__PACKAGE__"},
 298                                         __PACKAGE__,
 299                                         @{$W->{"packages_used"}{$Apache::Registry::curstash}},
 300                                         )));
 301                 print "</p>\n";
 302                 }
 303
 304         for my $package (
 305                         $W->{"__PACKAGE__"},
 306                         __PACKAGE__,
 307                         @{$W->{"packages_used"}{$Apache::Registry::curstash}},
 308                         ) {
 309                 my $cvs_id=(eval('$'.$package."::CVS_ID")
 310 #                               || $package     # debug
 311                                 );
 312                 print '<!-- '.$package.' - $'.$cvs_id.'$ -->'."\n" if $cvs_id;
 313                 }
 314
 315         if ($W->{"heading"}) {
 316                 do { &{$_}() if $_; } for ($W->{"footing"});
 317                 }
 318
 319         print "</body></html>\n";
 320         exit(0);
 321 }
 322
 323 sub header (%)
 324 {
 325 my(%pairs)=@_;
 326
 327         while (my($key,$val)=each(%pairs)) {
 328                 do { cluck "Headers already sent"; next; } if $W->{"heading_done"};
 329                 for ($W->{"headers_lc"}{lc $key} || ()) {
 330                         delete $W->{"headers"}{$_};
 331                         }
 332                 $W->{"headers_lc"}{lc $key}=$key;
 333                 $W->{"headers"}{$key}=$val;
 334                 }
 335 }
 336
 337 sub size_display ($)
 338 {
 339 my($size)=@_;
 340
 341            if ($size<4096)
 342                 {}
 343         elsif ($size<1024*1024)
 344                 { $size=sprintf "%.1fK",$size/1024; }
 345         else
 346                 { $size=sprintf "%.1fM",$size/1024/1024; }
 347         $size.="B";
 348         return $size;
 349 }
 350
 351 sub url_is_local ($)
 352 {
 353 my($url)=@_;
 354
 355         return $url!~m#^[a-z]+://#;
 356 }
 357
 358 sub a_href ($;$%)
 359 {
 360 my($url,$contents,%args)=@_;
 361
 362         do { $$_=1 if !defined $$_; } for (\$args{"size"});
 363         $contents=CGI::escapeHTML($url) if !defined $contents;
 364         $contents=~s#<a\b[^>]*>##gi;
 365         $contents=~s#</a>##gi;
 366
 367         $url=top_dir($url) if url_is_local $url && $url=~m#^/#;
 368
 369         my $r='<a href="';
 370         my $urlent=CGI::escapeHTML($url);
 371            if ($url eq $urlent)
 372                 { $r.=$url; }
 373         elsif (url_is_local $url)
 374                 { $r.=$urlent; }
 375         elsif (defined $W->{"have_ent"} && !$W->{"have_ent"})   # non-ent client
 376                 { $r.=$url; }
 377         elsif ($W->{"have_ent"})        # ent client
 378                 { $r.=$urlent; }
 379         else    # unknown client, &CGI::escapeHTML should not be needed here
 380                 { $r.=CGI::escapeHTML(top_dir('/Redirect.pl?location='.uri_escape($url))); }
 381         $r.='"';
 382         do { $r.=" $_" if $_; } for ($args{"attr"});
 383         $r.='>'.$contents.'</a>';
 384         if ($args{"size"} && url_is_local($url) && $url=~/[.](?:gz|Z|rpm|zip|deb|lha)/) {       # Downloadable?
 385                 $url=top_dir_disk().$url if $url=~m#^/#;
 386                 if (!-r $url)
 387                         { cluck "File not readable: $url"; }
 388                 else {
 389                         $r.='&nbsp;('.size_display((stat($url))[7]).')';
 390                         }
 391                 }
 392         return $r;
 393 }
 394
 395 sub remote_ip ()
 396 {
 397         # Do not: PerlModule                 Apache::ForwardedFor
 398         #         PerlPostReadRequestHandler Apache::ForwardedFor
 399         # As 'Apache::ForwardedFor' takes the first of $ENV{"HTTP_X_FORWARDED_FOR"}
 400         # while the contents is '127.0.0.1, 213.220.195.171' if client has its own proxy.
 401         # We must take the last item ourselves.
 402         my $r=$ENV{"HTTP_X_FORWARDED_FOR"} || $W->{"r"}->get_remote_host();
 403         $r=~s/^.*,\s*//;
 404         return $r;
 405 }
 406
 407 sub is_cz ()
 408 {
 409         return "CZ" eq Geo::IP->new()->country_code_by_addr(remote_ip());
 410 }
 411
 412 sub a_href_cz ($$;%)
 413 {
 414 my($url,$contents,%args)=@_;
 415
 416         return a_href $url,$contents,%args if is_cz();
 417         return $contents;
 418 }
 419
 420 sub make ($)
 421 {
 422 my($cmd)=@_;
 423
 424         system {'flock'} 'flock','-x',top_dir_disk(),$cmd.' >&2';
 425 }
 426
 427 sub img_size ($$)
 428 {
 429 my($width,$height)=@_;
 430
 431         return ($W->{"have_style"} ? "style=\"border:0;width:${width}px;height:${height}px\"" : "border=\"0\"")
 432                         ." width=\"$width\" height=\"$height\"";
 433 }
 434
 435 sub negotiate_variant (%)
 436 {
 437 my(%args)=@_;
 438
 439         my @fields=("id","qs","content-type","encoding","charset","lang","size");
 440         return [ map(($args{$_}),@fields) ];
 441 }
 442
 443 my @img_variants=(
 444                 { "id"=>"png","qs"=>1.0,"content-type"=>"image/png" },
 445                 { "id"=>"gif","qs"=>0.9,"content-type"=>"image/gif" },
 446                 );
 447 my $img_variants_re='[.](?:'.join('|',"jpeg",map(($_->{"id"}),@img_variants)).')$';
 448
 449 sub img_src ($)
 450 {
 451 my($file_base)=@_;
 452
 453         if (!url_is_local($file_base)) {
 454                 return $file_base if !wantarray();
 455                 return ($file_base,$file_base);
 456                 }
 457         # Known image extension?
 458         if ($file_base=~m#$img_variants_re#o) {
 459                 return $file_base if !wantarray();
 460                 return ($file_base,$file_base) if $file_base!~m#^/#;
 461                 return (top_dir($file_base),top_dir_disk().$file_base);
 462                 }
 463
 464         my $file_base_disk;
 465         my $file_base_uri;
 466         if ($file_base!~m#^/#) {
 467                 $file_base_disk=$file_base_uri=$file_base;
 468                 }
 469         else {
 470                 $file_base_disk=top_dir_disk().$file_base;
 471                 $file_base_uri=top_dir($file_base);
 472                 }
 473
 474         my @nego_variants;
 475         for my $var (@img_variants) {
 476                 my $file=$file_base_disk.".".$var->{"id"};
 477                 # TODO: Somehow quickly check dependencies?
 478                 make('make -s --no-print-directory'
 479                                                 .' -C '."'".File::Basename::dirname($file)."' '".File::Basename::basename($file)."'")
 480                                 if !-f $file;
 481                 push @nego_variants,negotiate_variant(
 482                                 %$var,
 483                                 "size"=>(stat $file)[7],
 484                                 );
 485                 }
 486         # Do not: ,$W->{"r"});
 487         # but should we provide somehow either 'HTTP::Headers' or 'HTTP::Request' ?
 488         my $ext=HTTP::Negotiate::choose(\@nego_variants);
 489         $ext||=$img_variants[0]->{"id"};        # &HTTP::Negotiate::choose failed?
 490
 491         return $file_base_uri.".".$ext if !wantarray();
 492         return ($file_base_uri.".".$ext,$file_base_disk.".".$ext);
 493 }
 494
 495 sub img ($$;%)
 496 {
 497 my($file_base,$alt,%attr)=@_;
 498
 499         my($file_uri,$file_disk)=img_src $file_base;
 500         my($width,$height)=Image::Size::imgsize($file_disk);
 501         $alt=~s/<[^>]*>//g;
 502         $alt=CGI::escapeHTML($alt);
 503         my $content="<img src=\"$file_uri\" alt=\"$alt\" title=\"$alt\" ".img_size($width,$height)
 504                         .(!$attr{"attr"} ? "" : " ".$attr{"attr"})." />";
 505         return a_href img_src($attr{"a_href_img"}),$content if $attr{"a_href_img"};
 506         return a_href $attr{"a_href"},$content if $attr{"a_href"};
 507         return $content;
 508 }
 509
 510 sub centerimg
 511 {
 512         my $r.="";
 513         $r.='<table border="0" width="100%"><tr>'."\n";
 514         @_=( [@_] ) if !ref $_[0];
 515         for (@_) {
 516                 $r.="\t".'<td align="center">'.&{\&img}(@$_).'</td>'."\n";
 517                 }
 518         $r.='</tr></table>'."\n";
 519         return $r;
 520 }
 521
 522 sub rightimg
 523 {
 524 my($text,@args_img)=@_;
 525
 526         # Workaround bug of 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)':
 527         return <<"HERE";
 528 <table border="0" width="100%">
 529         <col width="@{[ (!$W->{"browser"}->ie() ? "1*" : "90%" ) ]}" />
 530         <col width="@{[ (!$W->{"browser"}->ie() ? "0*" : "10%" ) ]}" />
 531         <tr>
 532                 <td align="left">
 533                         @{[ $text ]}
 534                 </td>
 535                 <td align="right">
 536                         @{[ &{\&img}(@args_img) ]}
 537                 </td>
 538         </tr>
 539 </table>
 540 HERE
 541 }
 542
 543 sub readfile ($$)
 544 {
 545 my($class,$filename)=@_;
 546
 547         local *F;
 548         open F,$filename or die "Cannot open \"$filename\": $!";
 549         local $/=undef();
 550         my $data=<F>;
 551         close F;
 552         return $data;
 553 }
 554
 555 sub arr_keys (@)
 556 {
 557 my(@arr)=@_;
 558
 559         my @r=();
 560         while (@arr) {
 561                 push @r,shift @arr;     # key
 562                 shift @arr;     # val
 563                 }
 564         return @r;
 565 }
 566
 567 sub heading ()
 568 {
 569 my($class)=@_;
 570
 571         # $ENV{"CLIENT_CHARSET"} ignored (mod_czech support dropped!)
 572         my $client_charset=$W->{"force_charset"} || "us-ascii";
 573         header("Content-Style-Type"=>"text/css");
 574         header("Content-Script-Type"=>"text/javascript");
 575
 576         while (my($key,$val)=each(%{$W->{"headers"}})) {
 577                 $W->{"r"}->header_out($key,$val);
 578                 }
 579         $W->{"r"}->send_http_header("text/html; charset=$client_charset");      # "Content-type"; do not use header()
 580
 581         return if $W->{"heading_done"}++;
 582         exit if $W->{"r"}->header_only();
 583
 584         if (1) { # || !$msie_major || $msie_major>=4) # TODO:dyn
 585                 print '<?xml version="1.0" encoding="'.$client_charset.'"?>'."\n";
 586                 }
 587         print '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">'."\n";
 588         print '<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">'."\n";
 589         my $title=$W->{"title_prefix"}.join("",map({ ': '.$_; } ($W->{"title"} || ())));
 590         $title=~s#<[^>]*>##g;
 591         print "<head>";
 592         print "<title>$title</title>\n";
 593
 594         if ($W->{"have_css"}) {
 595                 print <<'HERE';
 596 <style type="text/css"><!--
 597 .cvs-id   { font-family: monospace; }
 598 .error    { color: red;   background-color: transparent; }
 599 .quote    { font-family: monospace; }
 600 .nowrap   { white-space: nowrap; }
 601 .centered { text-align: center; }
 602 .tab-bold { font-weight: bold; }
 603 .tab-head { font-weight: bold; color: yellow; background-color: transparent; }
 604 body {
 605                 background-color: black;
 606                 color: white;
 607                 }
 608 :link    { color: aqua;   background-color: transparent; }
 609 :visited { color: teal;   background-color: transparent; }
 610 h1,h2    { color: yellow; background-color: transparent; }
 611 td       { padding: 2px; }
 612 caption  { caption-side: bottom; }
 613 .footer img { vertical-align: middle; }
 614 HERE
 615                 print $W->{"head_css"}."\n";
 616                 print "--></style>\n";
 617                 }
 618
 619         print '<meta name="robots" content="'.($W->{"indexme"} ? "" : "no" ).'index,follow" />'."\n";
 620         print $W->{"head"};
 621         for my $type (qw(prev next index contents start up)) {
 622                 do { print '<link rel="'.$type.'" href="'.$_.'" />'."\n" if $_; } for ($W->{"rel_$type"});
 623                 }
 624         print "</head><body";
 625         print ' bgcolor="black" text="white" link="aqua" vlink="teal"'
 626                         if $W->{"browser"}->netscape() && $W->{"browser"}->major<=4;
 627         print ">\n";
 628
 629         if ($W->{"heading"}) {
 630                 do { &{$_}() if $_; } for ($W->{"heading"});
 631                 }
 632 }
 633
 634 1;