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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 object = require('acf2.object')
local class = object.class
local isinstance = object.isinstance
local super = object.super
local pth = require('acf2.path')
local util = require('acf2.util')
function M.null_addr(path, name) return '/null'..pth.join(path, name) end
M.BoundMember = class()
function M.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
local addr = field.addr or pth.escape(name)
if type(addr) == 'function' then addr = addr(pmt.path, name) end
return function(self, ...)
return member(
field,
{
txn=pmt.txn,
parent=parent,
path=pth.join(pmt.path, name),
addr=pth.to_absolute(addr, pmt.addr)
},
...
)
end
end
setmetatable(self, mt)
end
M.TreeNode = class()
local function equal_tns(tn1, tn2)
return getmetatable(tn1).path == getmetatable(tn2).path
end
function M.TreeNode:init(context)
local mt = getmetatable(self)
util.update(mt, context)
mt.__eq = equal_tns
mt._meta = {}
function mt.get(k, options) return mt.load(k, options) 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 M.has_permission(mt.parent, user, permission)
end
mt.txn.validable[mt.path] = mt.addr
end
function M.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 options = {create=create}
if create and #path == 1 then options.dereference = false end
local next = mt.get(name, options)
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 M.TreeNode.fetch(next, path, create)
end
function M.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, {dereference=false})
if not next then return {} end
local member = mt.member(name)
if member.deleted then return {member} end
return isinstance(next, M.TreeNode) and M.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
M.Collection = class(M.TreeNode)
function M.Collection:init(context, params)
super(self, M.Collection):init(context)
self.init = nil
self.fetch = nil
self.search_refs = nil
local mt = getmetatable(self)
local field = M.BoundMember(self, pth.wildcard, params.field)
function mt.topology() return field:topology() end
function mt.member(name)
return M.BoundMember(self, name, params.field)
end
function mt.load(k, options) return mt.member(k):load(options) end
if not mt.txn then return end
mt._meta.type = 'collection'
mt._meta.required = params.required
mt._meta['ui-member'] = params.ui_member or mt._meta['ui-name']:gsub(
's$', ''
)
mt._meta.widget = params.layout
function mt.meta()
if not mt._meta.members then mt._meta.members = field:meta() end
return mt._meta
end
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.__len() return #mt.members() 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
M.List = class(M.Collection)
function M.List:init(context, params)
super(self, M.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, {dereference=false}))
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, {dereference=false})) end
mt.save(i, v)
end
end
-- experimental
M.Mixed = class(M.Collection)
function M.Mixed:init(context, params)
super(self, M.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
for _, mf in ipairs{
'addr',
'contains',
'has_permission',
'insert',
'match',
'meta',
'mmeta',
'parent',
'path',
'topology'
} do M[mf] = meta_func(mf) end
function M.pairs(tbl, dereference)
if not isinstance(tbl, M.TreeNode) then return pairs(tbl) end
local mt = getmetatable(tbl)
local res = {}
for _, member in ipairs(mt.members()) do
res[member] = mt.load(member, {dereference=dereference})
end
return pairs(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 M.ipairs(tbl)
if not isinstance(tbl, M.TreeNode) then return ipairs(tbl) end
return _ipairs, getmetatable(tbl), 0
end
return M
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