add nerv.class and try to let Lua class inherit from ParamFile

1 files changed, 26 insertions, 1 deletions

diff --git a/nerv.lua b/nerv.lua
index ccff0a0..8e03cb2 100644
--- a/nerv.lua
+++ b/nerv.lua
@@ -1,6 +1,6 @@
 require 'libnerv'
 require 'matrix.init'
-nerv.class = require 'pl.class'
+-- nerv.class = require 'pl.class'
 nerv.utils = require 'pl.utils'
 
 function nerv.error(fmt, ...)
@@ -10,3 +10,28 @@ end
 function nerv.error_method_not_implement()
     nerv.error("method not implemented");
 end
+
+function nerv.class(tname, parenttname)
+
+   local function constructor(...)
+      local self = {}
+      nerv.setmetatable(self, tname)
+      if self.__init then
+         self:__init(...)
+      end
+      return self
+   end
+
+   local function factory()
+      local self = {}
+      nerv.setmetatable(self, tname)
+      return self
+   end
+
+   local mt = nerv.newmetatable(tname, parenttname, constructor, nil, factory)
+   local mpt
+   if parenttname then
+      mpt = nerv.getmetatable(parenttname)
+   end
+   return mt, mpt
+end