Change directory structure

luprex/lua/basics.lua

@@ -0,0 +1,21 @@
+makeclass('NilIsZero') -- This is intended to be used as a metatable
+makeclass('login')
+
+function NilIsZero.__index(t,k)
+  return 0
+  end
+
+function NilIsZero.__newindex(t,k,v)
+  if v~=nil and v~=0 then rawset(t,k,v) end
+  end
+
+function seq(a,b,c) return a<=b and b<=c end
+
+function bound(a,b,c)
+  if b<a then return b elseif b>c then return c else return b end
+  end
+
+function lerp(a,b,c,d,e)
+  return d+(e-d)*(a-b)/(c-b)
+  end
+