Philip Pawley wrote:
I want to be able to adapt my web-files, as they are being served, so that older browsers get an xhtml 1.0-transitional version instead of the default xhtml 1.1 version. This will involve replacing the DOCTYPE declaration and, also, various xhtml tags to include deprecated html attributes. This needs to happen only for older user agents such as Netscape 4.Though it may not be the best way, it is certainly a way. We used to embed special comments in a file, then in the script, read in the "template" as we called it, looked for the comment and whenever we found it dropped in whatever content was necessary. You could do something similar to this...
I imagine this can be done using some search-and-replace module but I can't find a suitable one.
Currently, I am using SSI to run a browser-detection script and insert appropriate css <link ..> and javascript <script..></script> tags. The problem with that is that it limits me to parsing only a small portion of the html file. Earlier, I asked a question about re-using variables so that I could use the several SSI includes and several scripts to do the task. It seems that storing the computed values of the variables from one script to the next is a bit too involved. (Thanks you, Wiggins D'Anconia, for your help with that).
-- THIS IS PSEUDO CODE!!! --
#!/usr/bin/perl
my $browser = 'old' if ($ENV{'USER_AGENT'} =~ /Netscape 4/);
my $newtag = '<p />';
print "Content-type: text/html\n\n";
my $TEMPLATE;
open($TEMPLATE,'/path/to/template.html') or die "Can't open template for reading: $!";
my @template = <$TEMPLATE>;
close($TEMPLATE);
foreach my $line (@template) {
if ($line =~ /<!--doctype-->/) {
if ($browser eq 'old') {
# print old version of doctype (or no doc type)
}
}
elsif ($line =~ /<!--oldtag-->/) {
$line =~ /<!--oldtag-->/$newtag/;
print $line;
}
}
This only works when comments are on their own line for the doctype and any server side includes will *NOT* be parsed without special treatment from the web server, or by getting the template through a second request to the server, but it should give you some ideas and get you started. Obviously you can use the power of hashes to handle multiple old tags, etc.
http://danconia.org
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