Arthur Reutenauer wrote:
>> local optimized_string = formatted_string:gsub('^(%d*\.%d-)(0*)$',
>> '%1')
>
> Actually, I just realized that the primitive tostring does exactly the
> same transformation (probably in a much safer way), so we can use it in
> the much more complete code:
>
> ====
>
> -- Thank you, Lua-users wiki :-)
> -- http://lua-users.org/wiki/VarargTheSecondClassCitizen Issue #7
>
> -- The first two functions below implement a map over a "..." list
> local function map_rec(f, n, a, ...)
> if n > 0 then return f(a), map_rec(f, n-1, ...) end
> end
>
> local function map(f, ...)
> return map_rec(f, select('#', ...), ...)
> end
>
> -- Our "better formatting" function
> function string.better_format(form, ...)
> -- Every number-kind-of-format -> %s
> form = form:gsub('%%[0-9]-%.?[0-9]-f', '%%s')
> form = form:gsub('%%d', '%%s')
> form = form:gsub('%%i', '%%s')
> -- Then make every argument in the list into a string
> return(string.format(form, map(tostring, ...)))
> end
>
> -- Now Lua will happily strip the trailing zeroes
> print(string.better_format("%f %f m", 94.486000, 30.000))
> print(string.better_format("%5f %.7f l", .577, 2.7828))
> print(string.better_format("%5f %.7f %d l", 3.14000, 2.7828, 3))
this is a bit weird case ... on the one hand you specify %5f and such
but that's ignored i.e. becomes %s so why not use %s in the first place
then
so, you could have said
print(string.format("%s %s m", 94.486000, 30.000))
print(string.format("%s %s l", .577, 2.7828))
print(string.format("%s %s %s l", 3.14000, 2.7828, 3))
which is then way faster
anyway, originally i used %s but when taco and i played with the
converter and did some performance tests we found out that %f is faster
(unless > 6 digits specified)
a more general speed improvement is to set the pdf compression to 3
i may add a stripper (more general one) once i reimplement the backend
(all backend stuff in mkiv is temporary)
Hans
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Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
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