1 files changed, 52 insertions, 0 deletions
diff --git a/acf/persistence/backends/volatile.lua b/acf/persistence/backends/volatile.lua
new file mode 100644
index 0000000..63d7265
--- /dev/null
+++ b/acf/persistence/backends/volatile.lua
@@ -0,0 +1,52 @@
+--[[
+Copyright (c) 2012-2013 Kaarle Ritvanen
+See LICENSE file for license details
+--]]
+
+module(..., package.seeall)
+
+local copy = require('acf.util').copy
+
+
+local function keys(tbl)
+   local res = {}
+   for k, v in pairs(tbl) do table.insert(res, k) end
+   return res
+end
+
+
+backend = require('acf.object').class()
+
+function backend:init(data) self.data = data or {} end
+
+function backend:_get(path)
+   local res = self.data
+   for _, comp in ipairs(path) do
+      if res == nil then return end
+      assert(type(res) == 'table')
+      res = res[tonumber(comp) or comp]
+   end
+   return res
+end
+
+function backend:get(path)
+   local res = self:_get(path)
+   return type(res) == 'table' and keys(res) or res
+end
+
+function backend:_set(path, tpe, value)
+   if tpe == 'table' then value = {} end
+
+   if #path == 0 then self.data = value
+
+   else
+      local comps = copy(path)
+      local name = comps[#comps]
+      table.remove(comps)
+      self:_get(comps)[tonumber(name) or name] = value
+   end
+end
+
+function backend:set(mods)
+   for _, mod in ipairs(mods) do self:_set(unpack(mod)) end
+end