switch to uids

1 files changed, 17 insertions, 6 deletions

diff --git a/honey/ecs.lua b/honey/ecs.lua
index 62acce0..8aa5c5c 100644
--- a/honey/ecs.lua
+++ b/honey/ecs.lua
@@ -1,3 +1,5 @@
+math.randomseed(os.time())
+
 local module = {}
 setmetatable(module, {__index=_G})
 setfenv(1, module)
@@ -61,6 +63,12 @@ end
 
 --===== EntityDb =====--
 
+
+-- EntityDb is a database of entities and their associated components
+-- it should be quite efficient to query for all entities with a given component, and reasonably
+-- efficient to query for all components of a given entity
+
+
 EntityDb = {}
 EntityDb.__index = EntityDb
 
@@ -78,17 +86,20 @@ setmetatable(EntityDb, {__call=EntityDb.new})
 
 function EntityDb.checkIsValid(self, id)
 	if not self.entities[id] then
-		error(string.format("invalid entity id: 0x%x", id))
+		error(string.format("invalid entity id: %s", tostring(id)))
 	end
 end
 
 
-local guid = (function()
-	local id = 0
-	return function() id=id+1 return id end
-end)()
+local function uid()
+	local template ='xxxx:xxxx:xxxx'
+	return string.gsub(template, 'x', function (c)
+		local v = math.random(0, 0xf)
+		return string.format('%x', v)
+	end)
+end
 function EntityDb.createEntity(self)
-	local id = guid()
+	local id = uid()
 	self.entities[id] = true
 	return id
 end