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--[[
Copyright (c) 2012-2013 Kaarle Ritvanen
See LICENSE file for license details
--]]
local M = {}
local raise = require('acf2.error').raise
local fld = require('acf2.model.field')
local Field = fld.Field
local Member = fld.Member
local node = require('acf2.model.node')
local BoundMember = node.BoundMember
local object = require('acf2.object')
local class = object.class
local super = object.super
local isinstance = object.isinstance
local pth = require('acf2.path')
local util = require('acf2.util')
local copy = util.copy
local map = util.map
local function to_member(obj, params)
if not params then params = {} end
if object.issubclass(obj, M.Model) then
params.model = obj
return fld.Model(params)
end
local res = getmetatable(obj).class and obj or obj(params)
assert(isinstance(res, Member))
return res
end
function M.to_field(obj, params)
local res = to_member(obj, params)
assert(isinstance(res, Field))
return res
end
M.Action = class(Member)
function M.Action:init(params)
super(self, M.Action):init(params)
if not self.func then error('Function not defined for action') end
if self.field then
assert(type(self.field) == 'table')
self.field = M.to_field(self.field)
self.field.addr = node.null_addr
end
getmetatable(self).__newindex = function(t, k, v)
assert(k == 'name')
rawset(t, k, v)
if t.field then t.field.name = v end
end
end
function M.Action:meta(context)
local res = super(self, M.Action):meta(context)
if self.field then res.arg = self.field:meta(context) end
return res
end
function M.new(base)
if not base then base = M.Model end
local res = class(base)
res.members = base == node.TreeNode and {} or copy(base.members)
local mt = copy(getmetatable(res))
function mt.__index(t, k) return base[k] end
function mt.__newindex(t, k, v)
assert(v)
local override = t[k]
if type(v) == 'table' then v = to_member(v) end
rawset(t, k, v)
if isinstance(v, Member) then
v.name = k
if not override then table.insert(t.members, k) end
end
end
setmetatable(res, mt)
if isinstance(base, M.Model) then util.setdefaults(res, base) end
return res
end
M.Model = M.new(node.TreeNode)
function M.Model:init(context)
super(self, M.Model):init(context)
local mt = getmetatable(self)
function mt.member(name, loose, tpe)
local m = mt.class[name]
if not tpe then tpe = Member end
if not isinstance(m, tpe) then m = nil end
if m == nil then
if loose then return end
raise(mt.path, 'Does not exist: '..name)
end
return BoundMember(self, name, m)
end
local function _members(tpe)
local res = {}
for _, name in ipairs(self.members) do
local m = mt.member(name, true, tpe)
if m then table.insert(res, m) end
end
return res
end
function mt.topology()
local res = {}
for _, f in ipairs(_members(Field)) do util.extend(res, f:topology()) end
return res
end
function mt.load(k, options)
local v = mt.class[k]
local create = options and options.create
if isinstance(v, Field) then
v = BoundMember(self, k, v)
local res = v:load{create=create}
if res == nil and v.compute then return v:compute() end
return res
end
assert(mt.txn)
if isinstance(v, M.Action) then
local f = v.field and BoundMember(self, k, v.field)
if create then return f and f:load{create=true} end
return function(var)
if f then f:save(var)
elseif var ~= nil then
raise(
pth.join(mt.path, v.name),
'Action does not accept an input argument'
)
end
local res = v.func(self, f and f:load())
if f then f:_save() end
return res
end
end
return v
end
if not mt.txn then return end
function mt.mmeta(name) return mt.member(name):meta() end
function mt.save(k, v) return mt.member(k, false, Field):save(v) end
local function tmeta(tpe)
return map(function(m) return m:meta() end, _members(tpe))
end
mt._meta.type = 'model'
function mt.meta()
if not mt._meta.fields then
mt._meta.fields = tmeta(Field)
mt._meta.actions = tmeta(M.Action)
end
return mt._meta
end
function mt.members()
return map(function(f) return f.name end, mt.meta().fields)
end
function mt.match(filter)
for k, v in pairs(filter) do
if not util.contains(v, mt.load(k)) then return false end
end
return true
end
function mt.validate()
for _, f in ipairs(_members(Field)) do
if f.editable and not f.compute then
if mt.match(f.condition or {}) then f:validate_saved()
else f:_save() end
end
end
if self.validate then self:validate() end
end
if self.has_permission then
function mt.has_permission(user, permission)
return self:has_permission(user, permission)
end
end
end
return M
|
