132html

   1 #! /usr/bin/perl -w
   2
   3 # Script to turn PCRE man pages into HTML
   4
   5
   6 # Subroutine to handle font changes and other escapes
   7
   8 sub do_line {
   9 my($s) = $_[0];
  10
  11 $s =~ s/</&#60;/g;                   # Deal with < and >
  12 $s =~ s/>/&#62;/g;
  13 $s =~ s"\\fI(.*?)\\f[RP]"<i>$1</i>"g;
  14 $s =~ s"\\fB(.*?)\\f[RP]"<b>$1</b>"g;
  15 $s =~ s"\\e"\\"g;
  16 $s =~ s/(?<=Copyright )\(c\)/&copy;/g;
  17 $s;
  18 }
  19
  20 # Subroutine to ensure not in a paragraph
  21
  22 sub end_para {
  23 if ($inpara)
  24   {
  25   print TEMP "</PRE>\n" if ($inpre);
  26   print TEMP "</P>\n";
  27   }
  28 $inpara = $inpre = 0;
  29 $wrotetext = 0;
  30 }
  31
  32 # Subroutine to start a new paragraph
  33
  34 sub new_para {
  35 &end_para();
  36 print TEMP "<P>\n";
  37 $inpara = 1;
  38 }
  39
  40
  41 # Main program
  42
  43 $innf = 0;
  44 $inpara = 0;
  45 $inpre = 0;
  46 $wrotetext = 0;
  47 $toc = 0;
  48 $ref = 1;
  49
  50 while ($#ARGV >= 0 && $ARGV[0] =~ /^-/)
  51   {
  52   $toc = 1 if $ARGV[0] eq "-toc";
  53   shift;
  54   }
  55
  56 # Initial output to STDOUT
  57
  58 print <<End ;
  59 <html>
  60 <head>
  61 <title>$ARGV[0] specification</title>
  62 </head>
  63 <body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB">
  64 <h1>$ARGV[0] man page</h1>
  65 <p>
  66 Return to the <a href="index.html">PCRE index page</a>.
  67 </p>
  68 <p>
  69 This page is part of the PCRE HTML documentation. It was generated automatically
  70 from the original man page. If there is any nonsense in it, please consult the
  71 man page, in case the conversion went wrong.
  72 <br>
  73 End
  74
  75 print "<ul>\n" if ($toc);
  76
  77 open(TEMP, ">/tmp/$$") || die "Can't open /tmp/$$ for output\n";
  78
  79 while (<STDIN>)
  80   {
  81   # Handle lines beginning with a dot
  82
  83   if (/^\./)
  84     {
  85     # Some of the PCRE man pages used to contain instances of .br. However,
  86     # they should have all been removed because they cause trouble in some
  87     # (other) automated systems that translate man pages to HTML. Complain if
  88     # we find .br or .in (another macro that is deprecated).
  89
  90     if (/^\.br/ || /^\.in/)
  91       {
  92       print STDERR "\n*** Deprecated macro encountered - rewrite needed\n";
  93       print STDERR "*** $_\n";
  94       die "*** Processing abandoned\n";
  95       }
  96
  97     # Instead of .br, relevent "literal" sections are enclosed in .nf/.fi.
  98
  99     elsif (/^\.nf/)
 100       {
 101       $innf = 1;
 102       }
 103
 104     elsif (/^\.fi/)
 105       {
 106       $innf = 0;
 107       }
 108
 109     # Handling .sp is subtle. If it is inside a literal section, do nothing if
 110     # the next line is a non literal text line; similarly, if not inside a
 111     # literal section, do nothing if a literal follows, unless we are inside
 112     # a .nf/.ne section. The point being that the <pre> and </pre> that delimit
 113     # literal sections will do the spacing. Always skip if no previous output.
 114
 115     elsif (/^\.sp/)
 116       {
 117       if ($wrotetext)
 118         {
 119         $_ = <STDIN>;
 120         if ($inpre)
 121           {
 122           print TEMP "\n" if (/^[\s.]/);
 123           }
 124         else
 125           {
 126           print TEMP "<br>\n<br>\n" if ($innf || !/^[\s.]/);
 127           }
 128         redo;    # Now process the lookahead line we just read
 129         }
 130       }
 131     elsif (/^\.TP/ || /^\.PP/ || /^\.P/)
 132       {
 133       &new_para();
 134       }
 135     elsif (/^\.SH\s*("?)(.*)\1/)
 136       {
 137       # Ignore the NAME section
 138       if ($2 =~ /^NAME\b/)
 139         {
 140         <STDIN>;
 141         next;
 142         }
 143
 144       &end_para();
 145       my($title) = &do_line($2);
 146       if ($toc)
 147         {
 148         printf("<li><a name=\"TOC%d\" href=\"#SEC%d\">$title</a>\n",
 149           $ref, $ref);
 150         printf TEMP ("<br><a name=\"SEC%d\" href=\"#TOC1\">$title</a><br>\n",
 151           $ref);
 152         $ref++;
 153         }
 154       else
 155         {
 156         print TEMP "<br><b>\n$title\n</b><br>\n";
 157         }
 158       }
 159     elsif (/^\.SS\s*("?)(.*)\1/)
 160       {
 161       &end_para();
 162       my($title) = &do_line($2);
 163       print TEMP "<br><b>\n$title\n</b><br>\n";
 164       }
 165     elsif (/^\.B\s*(.*)/)
 166       {
 167       &new_para() if (!$inpara);
 168       $_ = &do_line($1);
 169       s/"(.*?)"/$1/g;
 170       print TEMP "<b>$_</b>\n";
 171       $wrotetext = 1;
 172       }
 173     elsif (/^\.I\s*(.*)/)
 174       {
 175       &new_para() if (!$inpara);
 176       $_ = &do_line($1);
 177       s/"(.*?)"/$1/g;
 178       print TEMP "<i>$_</i>\n";
 179       $wrotetext = 1;
 180       }
 181
 182     # A comment that starts "HREF" takes the next line as a name that
 183     # is turned into a hyperlink, using the text given, which might be
 184     # in a special font. If it ends in () or (digits) or punctuation, they
 185     # aren't part of the link.
 186
 187     elsif (/^\.\\"\s*HREF/)
 188       {
 189       $_=<STDIN>;
 190       chomp;
 191       $_ = &do_line($_);
 192       $_ =~ s/\s+$//;
 193       $_ =~ /^(?:<.>)?([^<(]+)(?:\(\))?(?:<\/.>)?(?:\(\d+\))?[.,;:]?$/;
 194       print TEMP "<a href=\"$1.html\">$_</a>\n";
 195       }
 196
 197     # A comment that starts "HTML" inserts literal HTML
 198
 199     elsif (/^\.\\"\s*HTML\s*(.*)/)
 200       {
 201       print TEMP $1;
 202       }
 203
 204     # A comment that starts < inserts that HTML at the end of the
 205     # *next* input line - so as not to get a newline between them.
 206
 207     elsif (/^\.\\"\s*(<.*>)/)
 208       {
 209       my($markup) = $1;
 210       $_=<STDIN>;
 211       chomp;
 212       $_ = &do_line($_);
 213       $_ =~ s/\s+$//;
 214       print TEMP "$_$markup\n";
 215       }
 216
 217     # A comment that starts JOIN joins the next two lines together, with one
 218     # space between them. Then that line is processed. This is used in some
 219     # displays where two lines are needed for the "man" version. JOINSH works
 220     # the same, except that it assumes this is a shell command, so removes
 221     # continuation backslashes.
 222
 223     elsif (/^\.\\"\s*JOIN(SH)?/)
 224       {
 225       my($one,$two);
 226       $one = <STDIN>;
 227       $two = <STDIN>;
 228       $one =~ s/\s*\\e\s*$// if (defined($1));
 229       chomp($one);
 230       $two =~ s/^\s+//;
 231       $_ = "$one $two";
 232       redo;            # Process the joined lines
 233       }
 234
 235     # .EX/.EE are used in the pcredemo page to bracket the entire program,
 236     # which is unmodified except for turning backslash into "\e".
 237
 238     elsif (/^\.EX\s*$/)
 239       {
 240       print TEMP "<PRE>\n";
 241       while (<STDIN>)
 242         {
 243         last if /^\.EE\s*$/;
 244         s/\\e/\\/g;
 245         s/&/&amp;/g;
 246         s/</&lt;/g;
 247         s/>/&gt;/g;
 248         print TEMP;
 249         }
 250       }
 251
 252     # Ignore anything not recognized
 253
 254     next;
 255     }
 256
 257   # Line does not begin with a dot. Replace blank lines with new paragraphs
 258
 259   if (/^\s*$/)
 260     {
 261     &end_para() if ($wrotetext);
 262     next;
 263     }
 264
 265   # Convert fonts changes and output an ordinary line. Ensure that indented
 266   # lines are marked as literal.
 267
 268   $_ = &do_line($_);
 269   &new_para() if (!$inpara);
 270
 271   if (/^\s/)
 272     {
 273     if (!$inpre)
 274       {
 275       print TEMP "<pre>\n";
 276       $inpre = 1;
 277       }
 278     }
 279   elsif ($inpre)
 280     {
 281     print TEMP "</pre>\n";
 282     $inpre = 0;
 283     }
 284
 285   # Add <br> to the end of a non-literal line if we are within .nf/.fi
 286
 287   $_ .= "<br>\n" if (!$inpre && $innf);
 288
 289   print TEMP;
 290   $wrotetext = 1;
 291   }
 292
 293 # The TOC, if present, will have been written - terminate it
 294
 295 print "</ul>\n" if ($toc);
 296
 297 # Copy the remainder to the standard output
 298
 299 close(TEMP);
 300 open(TEMP, "/tmp/$$") || die "Can't open /tmp/$$ for input\n";
 301
 302 print while (<TEMP>);
 303
 304 print <<End ;
 305 <p>
 306 Return to the <a href="index.html">PCRE index page</a>.
 307 </p>
 308 End
 309
 310 close(TEMP);
 311 unlink("/tmp/$$");
 312
 313 # End