Performance improvement when transmitting

The 'checked' table is passed by reference anyway, so reassigning it at
every step along the network is just wasting time by creating more and
more copies of it.

1 files changed, 3 insertions, 4 deletions

diff --git a/digilines/internal.lua b/digilines/internal.lua
index ce4012c..9a4780c 100644
--- a/digilines/internal.lua
+++ b/digilines/internal.lua
@@ -66,9 +66,8 @@ function digiline:rules_link_anydir(output, input)
 end
 
 function digiline:transmit(pos, channel, msg, checked)
-	checked = checked or {}
 	local checkedid = tostring(pos.x).."_"..tostring(pos.y).."_"..tostring(pos.z)
-	if checked[checkedid] then return checked end
+	if checked[checkedid] then return end
 	checked[checkedid] = true
 
 	local node = minetest.env:get_node(pos)
@@ -86,9 +85,9 @@ function digiline:transmit(pos, channel, msg, checked)
 		local rules = digiline:importrules(spec.wire.rules, node)
 		for _,rule in ipairs(rules) do
 			if digiline:rules_link(pos, digiline:addPosRule(pos, rule)) then
-				checked = digiline:transmit(digiline:addPosRule(pos, rule), channel, msg, checked)
+			        digiline:transmit(digiline:addPosRule(pos, rule), channel, msg, checked)
 			end
 		end
 	end
-	return checked
+	return
 end