Wiggins D'Anconia wrote:
>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.
>>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).
>
>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...
>
>-- 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
Thanks for the suggestions. The problem is I need to start from someone requesting an
html file, not someone calling a script.
How can I do it?
Thanks,
Philip Pawley
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