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Removed function in lume.slice()

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Moved the function index() from lume.slice()'s body to local var
absindex, this improves the performance of lume.slice() on luajit
significantly and improves it to a lesser extent on non-jit lua.
This commit is contained in:
rxi 2014-04-01 12:17:55 +01:00
parent 94977b4f7e
commit 335b928cae
1 changed files with 6 additions and 3 deletions
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9
lume.lua
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@ -27,6 +27,10 @@ local patternescape = function(str)
return str:gsub("[%(%)%.%%%+%-%*%?%[%]%^%$]", "%%%1")
end
local absindex = function(len, i)
return i < 0 and (len + i + 1) or i
end
function lume.clamp(x, min, max)
return x < min and min or (x > max and max or x)
@ -194,9 +198,8 @@ end
function lume.slice(t, i, j)
local function index(x) return x < 0 and (#t + x + 1) or x end
i = i and index(i) or 1
j = j and index(j) or #t
i = i and absindex(#t, i) or 1
j = j and absindex(#t, j) or #t
local rtn = {}
for i = math_max(i, 1), math_min(j, #t) do
rtn[#rtn + 1] = t[i]