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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 isinstance = object.isinstance
local super = object.super
local pth = require('acf.path')
local util = require('acf.util')
BoundMember = class()
function BoundMember:init(parent, name, 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, ...)
return member(
field,
{
txn=pmt.txn,
parent=parent,
path=pth.join(pmt.path, name),
addr=pth.to_absolute(
field.addr or pth.escape(name), pmt.addr
)
},
...
)
end
end
setmetatable(self, mt)
end
TreeNode = class()
function TreeNode:init(context)
local mt = getmetatable(self)
util.update(mt, context)
mt.meta = {}
function mt.get(k, create) return mt.load(k, create) end
if not mt.txn then return end
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.__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:fetch('/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:fetch(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.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.fetch(next, path, create)
end
function TreeNode:search_refs(path)
if type(path) == 'string' then path = pth.split(path) end
if #path == 0 then return {} end
local mt = getmetatable(self)
local name = path[1]
table.remove(path, 1)
local function collect(name)
local next = mt.load(name)
if not next then return {} end
local member = mt.member(name)
if member.deleted then return {member} end
return isinstance(next, TreeNode) and TreeNode.search_refs(
next, path
) or {}
end
if name == pth.wildcard then
local res = {}
for _, member in ipairs(mt.members()) do
util.extend(res, collect(member))
end
return res
end
return collect(name)
end
Collection = class(TreeNode)
function Collection:init(context, params)
super(self, Collection):init(context)
self.init = nil
self.fetch = nil
self.search_refs = nil
local mt = getmetatable(self)
local field = BoundMember(self, pth.wildcard, params.field)
function mt.topology() return field:topology() end
function mt.member(name)
return BoundMember(self, name, params.field)
end
function mt.load(k, create) return mt.member(k):load(create) end
if not mt.txn then return end
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.mmeta(name)
local res = util.copy(mt.meta.members)
if name ~= pth.wildcard then
res['ui-name'] = mt.meta['ui-member']..' '..name
end
return res
end
function mt.members() return mt.txn:get(mt.addr) 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.save(k, v) mt.member(k):save(v) end
end
List = class(Collection)
function List:init(context, params)
super(self, List):init(context, params)
local mt = getmetatable(self)
mt.meta.type = 'list'
local save = mt.save
function mt.save(k, v)
assert(type(k) == 'number')
if v == nil then
local len = #mt.members()
while k < len do
mt.save(k, mt.load(k + 1))
k = k + 1
end
end
save(k, v)
end
function mt.insert(v, i)
local len = #mt.members()
if not i then i = len + 1 end
for j = len,i,-1 do mt.save(j + 1, mt.load(j)) end
mt.save(i, 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(...) end
return res
end
end
addr = meta_func('addr')
has_permission = meta_func('has_permission')
insert = meta_func('insert')
members = meta_func('members')
meta = meta_func('meta')
mmeta = meta_func('mmeta')
parent = meta_func('parent')
path = meta_func('path')
topology = meta_func('topology')
validate = meta_func('validate')
local rawpairs = pairs
local rawipairs = ipairs
function pairs(tbl)
if not 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 isinstance(tbl, TreeNode) then return rawipairs(tbl) end
return _ipairs, getmetatable(tbl), 0
end
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