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Added tiny.filterWorld function #27

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Added tiny.filterWorld function #27

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23 changes: 22 additions & 1 deletion tiny.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -817,6 +817,25 @@ function tiny.getSystemCount(world)
return #world.systems
end

--- Gets entities according to filter (not in base)
function tiny.filterWorld(world, filter)
local t = {}
for i = 1, #(world.entities) do
if ((not filter) or filter(world, world.entities[i])) then
table.insert(t, world.entities[i])
end
end
local index = 0
return function()
index = index + 1
if index <= #t then
return t[index]
end
end
end



--- Sets the index of a System in the World, and returns the old index. Changes
-- the order in which they Systems processed, because lower indexed Systems are
-- processed first. Returns the old system.index.
Expand Down Expand Up @@ -854,7 +873,9 @@ worldMetaTable = {
clearSystems = tiny.clearSystems,
getEntityCount = tiny.getEntityCount,
getSystemCount = tiny.getSystemCount,
setSystemIndex = tiny.setSystemIndex
setSystemIndex = tiny.setSystemIndex,

filterWorld = tiny.filterWorld
},
__tostring = function()
return "<tiny-ecs_World>"
Expand Down