On 2012-01-01 at 12:28:06 +0100, Hans Hagen wrote:
> On 1-1-2012 10:32, Paul Isambert wrote:
> > Reinhard Kotucha<reinhard.kotu...@web.de> a écrit:
> >>
> >> Hi Taco,
> >> though luatex isn't frozen yet, I think that many people are using it
> >> already and drastic changes are not desirable.
> >>
> >> There is one thing which could probably be improved without breaking
> >> existing scripts, as far as I can see:
> >>
> >> string.explode(foo, ' +')
> >>
> >> expects that ' ' is a space token (ASCII 0x20). Is it possible to
> >> change string.explode() so that ' ' can be either a space token (ASCII
> >> 0x20) or a tabulator (ASCII 0x09) without breaking existing scripts?
> >
> > By definition, this would break those scripts that use string.explode()
> > expecting spaces aren't tabs. Personally, I wouldn't mind if the function
> > was modified in order to understand regular expressions, although that
> > would quite clearly be incompatible with previous behavior.
>
> in that case one could use the normal string matching function or lpeg
> ... there is no need to burden luatex with large regexp libraries or
> other clever tricks .. also by interpreting space as either space or tab
> we end up with more of that (unbreakable space etc etc, unicode spacing)
> and it also defeats the purpose of the explode function: any added
> interpretation of the split pattern is one more argument for using
> regular lua string functions
>
> local explode = function(s,p)
> local t = { }
> for s in gmatch(s,p) do
> if s ~= "" then
> t[#t+1] = s
> end
> end
> return t
> end
>
> local t = explode(str,"[^\t ]+")
>
> works quite ok (and the space only variant is some 30% slower than
> explode but hardly measurable. Adding space interpretation to the built
> in explode function would make is slower.
Thank you Hans, this is even much better than what I asked for.
Regards,
Reinhard
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