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--[[
Copyright (c) 2012-2013 Kaarle Ritvanen
See LICENSE file for license details
--]]
local M = {}
local TreeNode = require('acf2.model.field').TreeNode
local node = require('acf2.model.node')
local object = require('acf2.object')
local pth = require('acf2.path')
M.Set = object.class(require('acf2.model.node').List)
function M.Set:init(context, params)
assert(not object.isinstance(params.field, TreeNode))
params.field.dereference = false
object.super(self, M.Set):init(context, params)
local function find(value)
for i, member in node.pairs(self) do
if member == value then return i end
end
end
local mt = getmetatable(self)
mt._meta.type = 'set'
function mt.get(k, create)
local i = find(k)
if i then return mt.load(i, {dereference=true}) end
if create then return k end
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
function mt.contains(v)
return find(
node.BoundMember(self, pth.wildcard, params.field):normalize(v)
) and true or false
end
local insert = mt.insert
function mt.insert(v) if not mt.contains(v) then insert(v) end end
end
return M
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