Minetest-WorldEditAdditions/worldeditadditions/lib/selection/stack.lua

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local wea_c = worldeditadditions_core
local Vector3 = wea_c.Vector3
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--- Holds the per-user selection stacks.
worldeditadditions.sstack = {}
local sstack_max = 100
--- Calculates the height of the selection stack for the defined user.
-- If the defined user doesn't yet have a stack, a value of 0 is returned.
-- @param user string The name of the user to count the size of the selection stack for.
-- @return number The number of items on the stack for the given user.
function worldeditadditions.scount(name)
if not worldeditadditions.sstack[name] then
return 0
end
return #worldeditadditions.sstack[name]
end
--- Inserts a selection region onto the stack for the user with the given name.
-- Stacks are per-user.
-- @param name string The name of the user to insert onto.
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-- @param pos1 Vector3 Position 1
-- @param pos2 Vector3 Position 2
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function worldeditadditions.spush(name, pos1, pos2)
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pos1 = Vector3.clon(pos1)
pos2 = Vector3.clon(pos2)
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if not worldeditadditions.sstack[name] then
worldeditadditions.sstack[name] = {}
end
-- Checck the stack height
if #worldeditadditions.sstack[name] > sstack_max then
return false, "Error: Selection stack height of "..sstack_max.." would be exceeded by pushing a new selection onto the stack now."
end
table.insert(worldeditadditions.sstack[name], { pos1, pos2 })
return true
end
--- Pops a selection region off the stack for the given user.
-- Stacks are per-user.
-- @param name string The name of the user to remove a selection region off the stack for.
-- @return bool,Vector|string, Vector A bool true/false indicating success, followed by either a error message as a string if false or a pair of Vectors for the pos1 and pos2 from the item popped from the stack respectively.
function worldeditadditions.spop(name)
if not worldeditadditions.sstack[name] or #worldeditadditions.sstack[name] == 0 then
return false, "Error: The stack for user "..name.." is empty, so can't remove anything from it."
end
local item = table.remove(worldeditadditions.sstack[name])
return true, item[1], item[2]
end