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--[[
Copyright (c) 2012-2013 Kaarle Ritvanen
See LICENSE file for license details
--]]
module(..., package.seeall)
local raise = require('acf.error').raise
local object = require('acf.object')
local class = object.class
local super = object.super
local pth = require('acf.path')
local util = require('acf.util')
BoundMember = class()
function BoundMember:init(parent, field)
local pmt = getmetatable(parent)
local mt = {}
function mt.__index(t, k)
local member = field[k]
if type(member) ~= 'function' then return member end
return function(self, ...)
local name
if field.name then name = field.name
else
name = arg[1]
table.remove(arg, 1)
end
return member(
field,
{
txn=pmt.txn,
parent=parent,
path=pth.join(pmt.path, name),
addr=pth.to_absolute(field.addr or name, pmt.addr)
},
unpack(arg)
)
end
end
setmetatable(self, mt)
end
TreeNode = class()
function TreeNode:init(context)
local mt = getmetatable(self)
util.update(mt, context)
mt.meta = {}
if mt.parent then
mt.meta['ui-name'] = getmetatable(mt.parent).mmeta(
pth.name(mt.path)
)['ui-name']
end
function mt.save(k, v) rawset(self, k, v) end
function mt.get(k, create) return mt.load(k, create) end
function mt.__index(t, k) return mt.get(k) end
function mt.__newindex(t, k, v) mt.save(k, v) end
function mt.has_permission(user, permission)
local p = permission..mt.path
if mt.txn:search('/auth/permissions')[p] then
return user:check_permission(p)
end
if ({create=true, delete=true})[permission] then
permission = 'modify'
end
return has_permission(mt.parent, user, permission)
end
mt.txn.validable[mt.path] = mt.addr
end
function TreeNode:search(path, create)
if type(path) == 'string' then path = pth.split(path) end
if #path == 0 then return self end
local mt = getmetatable(self)
local name = path[1]
if not mt.valid_member(name) then
raise(mt.path, 'Member does not exist: '..name)
end
local next = mt.get(name, create)
if next == nil and (not create or #path > 1) then
raise(mt.path, 'Subordinate does not exist: '..name)
end
table.remove(path, 1)
if #path > 0 and type(next) ~= 'table' then
raise(pth.join(mt.path, name), 'Is a primitive value')
end
return TreeNode.search(next, path, create)
end
Collection = class(TreeNode)
function Collection:init(context, params)
super(self, Collection):init(context)
self.init = nil
self.search = nil
local field = BoundMember(self, params.field)
local mt = getmetatable(self)
mt.meta.type = 'collection'
mt.meta.members = field:meta('$')
mt.meta['ui-member'] = params.ui_member or string.gsub(
mt.meta['ui-name'], 's$', ''
)
function mt.valid_member(name) return true end
function mt.mmeta(name)
local res = util.copy(mt.meta.members)
res['ui-name'] = mt.meta['ui-member']..' '..name
return res
end
function mt.members() return mt.txn:get(mt.addr, 'table') or {} end
function mt.validate()
if #mt.members() > 0 then return end
if params.required then raise(mt.path, 'Collection cannot be empty') end
if params.destroy then
mt.txn:set(mt.addr)
validate(mt.parent)
end
end
function mt.load(k, create) return field:load(k, create) end
function mt.save(k, v) field:save(k, v) end
end
-- experimental
Mixed = class(Collection)
function Mixed:init(context, params)
super(self, Mixed):init(context, params)
-- TODO dynamic meta: list non-leaf children
local mt = getmetatable(self)
mt.meta = {type='mixed', ['ui-name']=mt.path}
function mt.mmeta(name)
return {type='mixed', ['ui-name']=pth.join(mt.path, name)}
end
end
local function meta_func(attr)
return function(node, ...)
local res = getmetatable(node)[attr]
if type(res) == 'function' then return res(unpack(arg)) end
return res
end
end
addr = meta_func('addr')
has_permission = meta_func('has_permission')
members = meta_func('members')
meta = meta_func('meta')
mmeta = meta_func('mmeta')
parent = meta_func('parent')
path = meta_func('path')
validate = meta_func('validate')
local rawpairs = pairs
local rawipairs = ipairs
function pairs(tbl)
if not object.isinstance(tbl, TreeNode) then return rawpairs(tbl) end
local mt = getmetatable(tbl)
local res = {}
for _, member in rawipairs(mt.members()) do res[member] = mt.load(member) end
return rawpairs(res)
end
local function _ipairs(mt, i)
i = i + 1
local v = mt.load(i)
if v == nil then return end
return i, v
end
function ipairs(tbl)
if not object.isinstance(tbl, TreeNode) then return rawipairs(tbl) end
return _ipairs, getmetatable(tbl), 0
end
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