Hi! I have to use pattern matching in lua. I tried the function "string.gmatch". I want to match (iterate over) strings of the type ([0-9]+)(-([0-9]*))?(,|$) For example: 1,3- (iterations: 1 and 3-) 1-3,6,7 (iterations: 1-3 then 6 then 7) 1-2,5-6,10- (iterations 1-2 then 5-6 then 10-) André Caldas.
On 12/15/2012 1:12 AM, Andre Caldas wrote:
Hi!
I have to use pattern matching in lua. I tried the function "string.gmatch". I want to match (iterate over) strings of the type ([0-9]+)(-([0-9]*))?(,|$)
For example: 1,3- (iterations: 1 and 3-) 1-3,6,7 (iterations: 1-3 then 6 then 7) 1-2,5-6,10- (iterations 1-2 then 5-6 then 10-)
function whatever(str,n,action) action = action or print for s in string.gmatch(str,"[^,]+") do local a, b, c = string.match(s,"^(%d+)(%-?)(%d-)$") if c ~= "" then for i=tonumber(a),tonumber(c) do action(i) end elseif b ~= "" then for i=tonumber(a),n or tonumber(a) do action(i) end elseif a then action(tonumber(a)) end end end whatever("1,3-",5,function(i) print(">>>",i) end) whatever("1-3,6,7") whatever("1-2,5-6,10-",30) ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------
Hello, Hans! I had just managed to do it. I will switch to yours instead of mine... I don't have any experience in Lua. Sorry for bothering with such easy requests... By the way, simplesteps recognizes number ranges! :-) https://bitbucket.org/andrecaldas/context-simplesteps/src/1c7ced45208b782895... Thank you, André Caldas.
On 12/15/2012 2:10 AM, Andre Caldas wrote:
Hello, Hans!
I had just managed to do it. I will switch to yours instead of mine... I don't have any experience in Lua. Sorry for bothering with such easy requests...
As ranges are sometimes handy I've added a parser to the core (no upload yet, will happen sometime next week) -- utilities.parsers.stepper("1,3-",5,function(i) print(">>>",i) end) -- utilities.parsers.stepper("1-3,6,7") -- utilities.parsers.stepper("1-3,6,7",function(i) print(">>>",i) end) -- utilities.parsers.stepper("1:3,6,7") -- utilities.parsers.stepper(" 1 : 3, ,7 ") -- utilities.parsers.stepper("1-2,5-6,25-*",30) So: - * as optional final value symbol - optional spaces around : and, and around list - - as well as : ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------
participants (2)
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Andre Caldas -
Hans Hagen