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Fix crash on blueprint book creation, also refactor get_blueprint #41

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Fix crash on blueprint book creation, also refactor get_blueprint #41

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2063566
Fix crash on blueprint book creation, also refactor get_blueprint
sparr Aug 23, 2020
42c7de0
Add exit case for get_blueprint refactor
sparr Aug 23, 2020
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21 changes: 13 additions & 8 deletions util.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -4,14 +4,19 @@ local Util = {}

-- Returns the item if it is a blueprint, the selected blueprint in the book if it is a blueprint book, or nil.
function Util.get_blueprint(bp)
if not (bp and bp.valid and bp.valid_for_read) then
return nil
end
if bp.is_blueprint_book and bp.active_index then
return Util.get_blueprint(bp.get_inventory(defines.inventory.item_main)[bp.active_index])
end
if bp.is_blueprint then
return bp
while (bp and bp.valid and bp.valid_for_read) do
if bp.is_blueprint then
return bp
elseif bp.is_blueprint_book and bp.active_index then
local inventory = bp.get_inventory(defines.inventory.item_main)
if bp.active_index <= #inventory then
bp = inventory[bp.active_index]
else
return nil
end
else
return nil
end
end
return nil
end
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