1 files changed, 91 insertions, 0 deletions
diff --git a/acf2/model/root.lua b/acf2/model/root.lua
new file mode 100644
index 0000000..61debec
--- /dev/null
+++ b/acf2/model/root.lua
@@ -0,0 +1,91 @@
+--[[
+Copyright (c) 2012-2013 Kaarle Ritvanen
+See LICENSE file for license details
+--]]
+
+local M = {}
+
+local model = require('acf2.model.model')
+local node = require('acf2.model.node')
+local object = require('acf2.object')
+local pth = require('acf2.path')
+
+local util = require('acf2.util')
+local setdefault = util.setdefault
+
+
+M.RootModel = model.new()
+
+function M.RootModel:init(txn)
+   object.super(self, M.RootModel):init{txn=txn, path='/', addr='/null/root'}
+end
+
+function M.RootModel:has_permission(user, permission)
+   return permission == 'read'
+end
+
+function M.RootModel:meta(path)
+   local obj = self:fetch(path, true)
+   if object.isinstance(obj, node.TreeNode) then return node.meta(obj) end
+   return node.mmeta(self:fetch(pth.parent(path), true), pth.name(path))
+end
+
+
+local _topology = {}
+local order = 0
+
+function M.topology(addr, create)
+   local top = _topology
+   if type(addr) == 'table' then addr = util.copy(addr)
+   else addr = pth.split(addr) end
+
+   local function defaults(top)
+      return util.setdefaults(top, {members={}, paths={}, referrers={}})
+   end
+
+   while #addr > 0 do
+      if create then
+	 top = setdefault(defaults(top).members, addr[1], {})
+      else
+	 top = top.members[addr[1]] or top.members[pth.wildcard]
+	 if not top then return end
+      end
+      table.remove(addr, 1)
+   end
+
+   return defaults(top)
+end
+
+function M.register(name, field, params)
+   if not params then params = {} end
+   params.create = true
+   M.RootModel[name] = model.to_field(field, params)
+
+   local root = M.RootModel()
+
+   for _, record in ipairs(node.topology(root:fetch(name))) do
+      local top = M.topology(record.addr, true)
+
+      setdefault(top, 'order', order)
+      order = order + 1
+
+      local function set(k, v)
+	 setdefault(top, k, v)
+	 assert(top[k] == v)
+      end
+
+      set('type', record.type)
+      table.insert(top.paths, record.path)
+
+      if record.scope then
+	 local scope = node.addr(
+	    root:fetch(pth.to_absolute(record.scope, pth.parent(record.path)))
+	 )
+	 set('scope', scope)
+	 table.insert(M.topology(scope, true).referrers, record.path)
+      end
+   end
+end
+
+
+return M