From ca174fc7c2b22e902b93ef4183eb1f5235bcb5fa Mon Sep 17 00:00:00 2001
From: David Walter Seikel
Date: Sun, 5 Feb 2012 18:52:59 +1000
Subject: Fix things so the wire protocol can be functions in the LSL.lua file,
 and _LSL can go back to being local to the script.

---
 LuaSL/src/LSL.lua | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

(limited to 'LuaSL/src/LSL.lua')

diff --git a/LuaSL/src/LSL.lua b/LuaSL/src/LSL.lua
index 6473cc2..8774121 100644
--- a/LuaSL/src/LSL.lua
+++ b/LuaSL/src/LSL.lua
@@ -25,6 +25,9 @@ global uniqueness) for this key or store the metatable as an
 upvalue--either way is a bit more efficient and less error prone.
 ]]
 
+-- http://www.lua.org/pil/15.4.html looks useful.
+-- http://www.lua.org/pil/15.5.html the last part about autoloading functions might be useful.
+
 local LSL = {};
 
 -- LSL constants.
@@ -309,9 +312,8 @@ function LSL.postIncrement(name) local temp = _G[name]; _G[name] = _G[name] + 1;
 local currentState = {}
 local running = true;
 
--- Damn, looks like these sorts of functions have to be part of the table.
--- Coz pcall() runs in the context of the script, not this module, so needs to call _LSL.quit().
-function LSL.quit()
+-- Stuff called from the wire protocol has to be global, but I think this means just global to this file.
+function quit()
   running = false
 end
 
@@ -361,10 +363,13 @@ function LSL.mainLoop(SID, x)
   while running do
     local message = luaproc.receive(sid)
     if message then
-      result, errorMsg = loadstring(message)
+      result, errorMsg = loadstring(message)  -- "The environment of the returned function is the global environment."  Though normally, a function inherits it's environment from the function creating it.  Which is what we want.  lol
       if nil == result then
 	print("Not a valid event: " .. message .. "  ERROR MESSAGE: " .. errorMsg)
       else
+	-- Set the functions environment to ours, for the protection of the script, coz loadstring sets it to the global environment instead.
+	-- TODO - On the other hand, we will need the global environment when we call event handlers.  So we should probably stash it around here somewhere.
+	setfenv(result, getfenv(1))
 	status, result = pcall(result)
 	if not status then
 	  print("Error from event: " .. message .. "  ERROR MESSAGE: " .. result)
-- 
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