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--[[
Copyright (c) 2012-2013 Kaarle Ritvanen
See LICENSE file for license details
--]]
local M = {}
local TreeNode = require('acf.model.field').TreeNode
local npairs = require('acf.model.node').pairs
local object = require('acf.object')
M.Set = object.class(require('acf.model.node').List)
function M.Set:init(context, params)
assert(not object.isinstance(params.field, TreeNode))
object.super(self, M.Set):init(context, params)
local function find(value)
for i, member in npairs(self) do
if member == value then return i end
end
end
local mt = getmetatable(self)
mt.meta.type = 'set'
function mt.get(k, create) return (create or find(k)) and k end
function mt.__newindex(t, k, v)
assert(v == nil)
local i = find(k)
if not i then return end
mt.save(i, nil)
end
local insert = mt.insert
function mt.insert(v) if not find(v) then insert(v) end end
end
return M
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