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util.array: Improve array:reverse() and make it work as both method and non-mutating function

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Kim Alvefur 2013-10-06 23:18:54 +02:00
parent 8f5b133c60
commit 04699a3aa4
1 changed files with 20 additions and 9 deletions
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29
util/array.lua
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@ -11,6 +11,7 @@ local t_insert, t_sort, t_remove, t_concat
local setmetatable = setmetatable;
local math_random = math.random;
local math_floor = math.floor;
local pairs, ipairs = pairs, ipairs;
local tostring = tostring;
@ -84,6 +85,25 @@ function array_base.pluck(outa, ina, key)
return outa;
end
function array_base.reverse(outa, ina)
local len = #ina;
if ina == outa then
local middle = math_floor(len/2);
len = len + 1;
local o; -- opposite
for i = 1, middle do
o = len - i;
outa[i], outa[o] = outa[o], outa[i];
end
else
local off = len + 1;
for i = 1, len do
outa[i] = ina[off - i];
end
end
return outa;
end
--- These methods only mutate the array
function array_methods:shuffle(outa, ina)
local len = #self;
@ -94,15 +114,6 @@ function array_methods:shuffle(outa, ina)
return self;
end
function array_methods:reverse()
local len = #self-1;
for i=len,1,-1 do
self:push(self[i]);
self:pop(i);
end
return self;
end
function array_methods:append(array)
local len,len2 = #self, #array;
for i=1,len2 do