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https://github.com/sbrl/Minetest-WorldEditAdditions.git
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102 lines
3.2 KiB
Lua
102 lines
3.2 KiB
Lua
--- Sets for lua!
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-- local Set = {}
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--- Option 1:
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-- Set.__index = Set
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-- Set.__newindex = function(tbl, key, value)
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-- if not tbl.__protected[key] then
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-- rawset(tbl,key,value)
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-- else
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-- error("Protected!")
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-- end
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-- end
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-- Set.__protected = {
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-- __protected=true,
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-- new=true,
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-- add=true,
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-- delete=true,
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-- has=true
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-- }
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--- Option 2:
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local Set = {}
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Set.__index = Set
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Set.__newindex = function(tbl, key, value)
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rawset(tbl.set,key,value)
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end
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--- Creates a new set.
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-- @param i any Initial values(s) of the set.
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-- @returns Set A table of keys equal to true.
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function Set.new(i)
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local result = {set={}}
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setmetatable(result, Set)
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if type(i) == "table" then
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for k,v in pairs(i) do result[v] = true end
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elseif i then
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result[i] = true
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end
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return result
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end
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-- a = Set.new({"add","new","thing"})
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--- Adds item(s) to set.
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-- @param a set Set to manipulate.
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-- @param i not nil Values(s) to add.
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-- @returns bool Success of operation.
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function Set.add(a,i)
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if type(i) == "table" then
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for k,v in pairs(i) do a[v] = true end
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else
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a[i] = true
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end
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return true
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end
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--- Deletes item(s) from set.
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-- @param a set Set to manipulate.
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-- @param i not nil Values(s) to delete.
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-- @returns bool Success of operation.
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function Set.delete(a,i)
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if type(i) == "table" then
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for k,v in pairs(i) do a[v] = nil end
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else
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a[i] = nil
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end
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return true
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end
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--- Checks if value(s) are present in set.
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-- @param a set Set to inspect.
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-- @param i not nil Values(s) to check.
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-- @returns bool Value(s) are present?
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function Set.has(a,i)
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if type(i) == "table" then
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for k,v in pairs(i) do
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if not a[k] then return false end
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end
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return true
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else
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return a[i] ~= nil
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end
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end
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-- ██████ ██████ ███████ ██████ █████ ████████ ██████ ██████
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-- ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
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-- ██ ██ ██████ █████ ██████ ███████ ██ ██ ██ ██████
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-- ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
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-- ██████ ██ ███████ ██ ██ ██ ██ ██ ██████ ██ ██
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--
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-- ██████ ██ ██ ███████ ██████ ██████ ██ ██████ ███████ ███████
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-- ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
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-- ██ ██ ██ ██ █████ ██████ ██████ ██ ██ ██ █████ ███████
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-- ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
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-- ██████ ████ ███████ ██ ██ ██ ██ ██ ██████ ███████ ███████
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function Set.__call(i) return Set.new(i) end
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-- Main Return:
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return Set
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