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--[[
Copyright (c) 2012-2013 Kaarle Ritvanen
See LICENSE file for license details
--]]
module(..., package.seeall)
local TreeNode = require('acf.model.field').TreeNode
local npairs = require('acf.model.node').pairs
local object = require('acf.object')
local function find(set, value)
for i, member in npairs(set) do
if member == value then return i end
end
end
Set = object.class(require('acf.model.node').Collection)
function Set:init(context, params)
assert(not object.isinstance(params.field, TreeNode))
object.super(self, Set):init(context, params)
local mt = getmetatable(self)
mt.meta.type = 'set'
function mt.__index(t, k) return find(self, k) and k end
function mt.__newindex(t, k, v)
assert(v == nil)
local i = find(self, k)
if not i then return end
local len = #mt.members()
while i < len do
mt.set(i, mt.get(i + 1))
i = i + 1
end
mt.set(len, nil)
end
end
function add(set, value)
local mt = getmetatable(set)
if not find(set, value) then mt.set(#mt.members() + 1, value) end
end
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