* Michael Ludwig wrote, On 08/10/08 15:27:
> Sam Liddicott schrieb:
>> I need to do some limited text-node parsing in libxslt.
>>
>> I find parsing text very difficult in libxslt [...]
>
>> [...] libxslt doesn't seem to have regexp support, or at least not
>> widely distributed or even packaged for most platforms (including mine).
>>
>> str::tokenize etc are not good because they are too destructive and
>> destroy the separating tokens.
>>
>> The simplest expression [...] one character at a time.
>>
>> Clearly that is nuts.
>>
>> I'll probably have to go for use of: contains, substring-before,
>> substring-after, substring and string-length; and maybe str:tokenize
>> just to get lengths of substrings up to multiple delimeters.
>>
>> Clearly that is nuts too.
>>
>> Have I missed anything obvious?
>
> As you mention Perl, you may find it beneficial to use Perl for string
> manipulation from within XSLT, Perl being far superior to XSLT 1.0 in
> this respect.
>
> sub ts_to_w3cdtf { ... }
>
> XML::LibXSLT->register_function(
> 'urn:perl', 'ts-to-w3cdtf', \&ts_to_w3cdtf);
>
> <xsl:stylesheet version="1.0"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
> xmlns:perl="urn:perl">
>
> <xsl:value-of select="perl:ts-to-w3cdtf( @timestamp )"/>
Good tip; I think I won't get away with perl. This was for a light
webmail application.
I'll have enough trouble persuading them to go with libxslt for
html-message fixups instead of the existing C parser....I've been looking at the exslt functions: http://www.exslt.org/str/functions/split/str.split.function.xsl http://www.exslt.org/str/functions/tokenize/str.tokenize.function.xsl and they seem to do something like character-at-a-time recursion :-( So I'll probably modify str:tokenize so it also returns the tokens split-on, and in the webmail server I'll also implement this in C and register the function so it's fast when called from the server. Then I can just tokenize the text at white space, for-each each word (and white space) and match on the URL's that interest me. Sam
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