lib/perl5/5.6.1/CGI/Pretty.pm

   1 package CGI::Pretty;
   2
   3 # See the bottom of this file for the POD documentation.  Search for the
   4 # string '=head'.
   5
   6 # You can run this file through either pod2man or pod2html to produce pretty
   7 # documentation in manual or html file format (these utilities are part of the
   8 # Perl 5 distribution).
   9
  10 use strict;
  11 use CGI ();
  12
  13 $CGI::Pretty::VERSION = '1.05';
  14 $CGI::DefaultClass = __PACKAGE__;
  15 $CGI::Pretty::AutoloadClass = 'CGI';
  16 @CGI::Pretty::ISA = qw( CGI );
  17
  18 initialize_globals();
  19
  20 sub _prettyPrint {
  21     my $input = shift;
  22
  23     foreach my $i ( @CGI::Pretty::AS_IS ) {
  24         if ( $$input =~ /<\/$i>/si ) {
  25             my ( $a, $b, $c, $d, $e ) = $$input =~ /(.*)<$i(\s?)(.*?)>(.*?)<\/$i>(.*)/si;
  26             _prettyPrint( \$a );
  27             _prettyPrint( \$e );
  28
  29             $$input = "$a<$i$b$c>$d</$i>$e";
  30             return;
  31         }
  32     }
  33     $$input =~ s/$CGI::Pretty::LINEBREAK/$CGI::Pretty::LINEBREAK$CGI::Pretty::INDENT/g if $CGI::Pretty::LINEBREAK;
  34 }
  35
  36 sub comment {
  37     my($self,@p) = CGI::self_or_CGI(@_);
  38
  39     my $s = "@p";
  40     $s =~ s/$CGI::Pretty::LINEBREAK/$CGI::Pretty::LINEBREAK$CGI::Pretty::INDENT/g if $CGI::Pretty::LINEBREAK;
  41
  42     return $self->SUPER::comment( "$CGI::Pretty::LINEBREAK$CGI::Pretty::INDENT$s$CGI::Pretty::LINEBREAK" ) . $CGI::Pretty::LINEBREAK;
  43 }
  44
  45 sub _make_tag_func {
  46     my ($self,$tagname) = @_;
  47     return $self->SUPER::_make_tag_func($tagname) if $tagname=~/^(start|end)_/;
  48
  49     # As Lincoln as noted, the last else clause is VERY hairy, and it
  50     # took me a while to figure out what I was trying to do.
  51     # What it does is look for tags that shouldn't be indented (e.g. PRE)
  52     # and makes sure that when we nest tags, those tags don't get
  53     # indented.
  54     # For an example, try print td( pre( "hello\nworld" ) );
  55     # If we didn't care about stuff like that, the code would be
  56     # MUCH simpler.  BTW: I won't claim to be a regular expression
  57     # guru, so if anybody wants to contribute something that would
  58     # be quicker, easier to read, etc, I would be more than
  59     # willing to put it in - Brian
  60
  61     return qq{
  62         sub $tagname {
  63             # handle various cases in which we're called
  64             # most of this bizarre stuff is to avoid -w errors
  65             shift if \$_[0] &&
  66                     (ref(\$_[0]) &&
  67                      (substr(ref(\$_[0]),0,3) eq 'CGI' ||
  68                     UNIVERSAL::isa(\$_[0],'CGI')));
  69
  70             my(\$attr) = '';
  71             if (ref(\$_[0]) && ref(\$_[0]) eq 'HASH') {
  72                 my(\@attr) = make_attributes(shift);
  73                 \$attr = " \@attr" if \@attr;
  74             }
  75
  76             my(\$tag,\$untag) = ("\L<$tagname\E\$attr>","\L</$tagname>\E");
  77             return \$tag unless \@_;
  78
  79             my \@result;
  80             my \$NON_PRETTIFY_ENDTAGS =  join "", map { "</\$_>" } \@CGI::Pretty::AS_IS;
  81
  82             if ( \$NON_PRETTIFY_ENDTAGS =~ /\$untag/ ) {
  83                 \@result = map { "\$tag\$_\$untag\$CGI::Pretty::LINEBREAK" }
  84                  (ref(\$_[0]) eq 'ARRAY') ? \@{\$_[0]} : "\@_";
  85             }
  86             else {
  87                 \@result = map {
  88                     chomp;
  89                     if ( \$_ !~ /<\\// ) {
  90                         s/\$CGI::Pretty::LINEBREAK/\$CGI::Pretty::LINEBREAK\$CGI::Pretty::INDENT/g if \$CGI::Pretty::LINEBREAK;
  91                     }
  92                     else {
  93                         my \$tmp = \$_;
  94                         CGI::Pretty::_prettyPrint( \\\$tmp );
  95                         \$_ = \$tmp;
  96                     }
  97                     "\$tag\$CGI::Pretty::LINEBREAK\$CGI::Pretty::INDENT\$_\$CGI::Pretty::LINEBREAK\$untag\$CGI::Pretty::LINEBREAK" }
  98                 (ref(\$_[0]) eq 'ARRAY') ? \@{\$_[0]} : "\@_";
  99             }
 100             local \$" = "";
 101             return "\@result";
 102         }
 103     };
 104 }
 105
 106 sub start_html {
 107     return CGI::start_html( @_ ) . $CGI::Pretty::LINEBREAK;
 108 }
 109
 110 sub end_html {
 111     return CGI::end_html( @_ ) . $CGI::Pretty::LINEBREAK;
 112 }
 113
 114 sub new {
 115     my $class = shift;
 116     my $this = $class->SUPER::new( @_ );
 117
 118     Apache->request->register_cleanup(\&CGI::Pretty::_reset_globals) if ($CGI::MOD_PERL);
 119     $class->_reset_globals if $CGI::PERLEX;
 120
 121     return bless $this, $class;
 122 }
 123
 124 sub initialize_globals {
 125     # This is the string used for indentation of tags
 126     $CGI::Pretty::INDENT = "\t";
 127
 128     # This is the string used for seperation between tags
 129     $CGI::Pretty::LINEBREAK = "\n";
 130
 131     # These tags are not prettify'd.
 132     @CGI::Pretty::AS_IS = qw( a pre code script textarea );
 133
 134     1;
 135 }
 136 sub _reset_globals { initialize_globals(); }
 137
 138 1;
 139
 140 =head1 NAME
 141
 142 CGI::Pretty - module to produce nicely formatted HTML code
 143
 144 =head1 SYNOPSIS
 145
 146     use CGI::Pretty qw( :html3 );
 147
 148     # Print a table with a single data element
 149     print table( TR( td( "foo" ) ) );
 150
 151 =head1 DESCRIPTION
 152
 153 CGI::Pretty is a module that derives from CGI.  It's sole function is to
 154 allow users of CGI to output nicely formatted HTML code.
 155
 156 When using the CGI module, the following code:
 157     print table( TR( td( "foo" ) ) );
 158
 159 produces the following output:
 160     <TABLE><TR><TD>foo</TD></TR></TABLE>
 161
 162 If a user were to create a table consisting of many rows and many columns,
 163 the resultant HTML code would be quite difficult to read since it has no
 164 carriage returns or indentation.
 165
 166 CGI::Pretty fixes this problem.  What it does is add a carriage
 167 return and indentation to the HTML code so that one can easily read
 168 it.
 169
 170     print table( TR( td( "foo" ) ) );
 171
 172 now produces the following output:
 173     <TABLE>
 174        <TR>
 175           <TD>
 176              foo
 177           </TD>
 178        </TR>
 179     </TABLE>
 180
 181
 182 =head2 Tags that won't be formatted
 183
 184 The <A> and <PRE> tags are not formatted.  If these tags were formatted, the
 185 user would see the extra indentation on the web browser causing the page to
 186 look different than what would be expected.  If you wish to add more tags to
 187 the list of tags that are not to be touched, push them onto the C<@AS_IS> array:
 188
 189     push @CGI::Pretty::AS_IS,qw(CODE XMP);
 190
 191 =head2 Customizing the Indenting
 192
 193 If you wish to have your own personal style of indenting, you can change the
 194 C<$INDENT> variable:
 195
 196     $CGI::Pretty::INDENT = "\t\t";
 197
 198 would cause the indents to be two tabs.
 199
 200 Similarly, if you wish to have more space between lines, you may change the
 201 C<$LINEBREAK> variable:
 202
 203     $CGI::Pretty::LINEBREAK = "\n\n";
 204
 205 would create two carriage returns between lines.
 206
 207 If you decide you want to use the regular CGI indenting, you can easily do
 208 the following:
 209
 210     $CGI::Pretty::INDENT = $CGI::Pretty::LINEBREAK = "";
 211
 212 =head1 BUGS
 213
 214 This section intentionally left blank.
 215
 216 =head1 AUTHOR
 217
 218 Brian Paulsen <Brian@ThePaulsens.com>, with minor modifications by
 219 Lincoln Stein <lstein@cshl.org> for incorporation into the CGI.pm
 220 distribution.
 221
 222 Copyright 1999, Brian Paulsen.  All rights reserved.
 223
 224 This library is free software; you can redistribute it and/or modify
 225 it under the same terms as Perl itself.
 226
 227 Bug reports and comments to Brian@ThePaulsens.com.  You can also write
 228 to lstein@cshl.org, but this code looks pretty hairy to me and I'm not
 229 sure I understand it!
 230
 231 =head1 SEE ALSO
 232
 233 L<CGI>
 234
 235 =cut