summaryrefslogtreecommitdiffstats
path: root/acf/util.lua
blob: e66b711b2180b496f1c901ede6504b8240be3078 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
--[[
Copyright (c) 2012-2013 Kaarle Ritvanen
See LICENSE file for license details
--]]

local M = {}

function M.setdefault(t, k, v)
   if t[k] == nil then t[k] = v end
   return t[k]
end

function M.update(dst, src, preserve)
   for k, v in pairs(src) do
      if not preserve or dst[k] == nil then dst[k] = v end
   end
   return dst
end

function M.setdefaults(dst, src) return M.update(dst, src, true) end

function M.copy(var)
   return type(var) == 'table' and M.setdefaults({}, var) or var
end

function M.extend(dst, src)
   for _, v in ipairs(src) do table.insert(dst, v) end
   return dst
end

function M.keys(tbl)
   local res = {}
   for k, v in pairs(tbl) do table.insert(res, k) end
   return res
end

function M.map(func, tbl)
   local res = {}
   for k, v in pairs(tbl) do res[k] = func(v) end
   return res
end

return M