Module:TableTools: Difference between revisions
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fix lim variable in intersection function |
add key/value pair union function |
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------------------------------------------------------------------------------------ |
------------------------------------------------------------------------------------ |
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-- union |
-- union |
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-- |
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-- This returns the union of the key/value pairs of n tables. If any of the tables |
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-- contain different values for the same table key, the table value is converted |
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-- to an array holding all of the different values. |
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------------------------------------------------------------------------------------ |
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--]] |
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function p.union(...) |
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local ret, trackArrays = {}, {} |
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for i = 1, select('#', ...) do |
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local t = select(i, ...) |
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for k, v in pairs(t) do |
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local retKey = ret[k] |
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if retKey == nil then |
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ret[k] = v |
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elseif retKey ~= v then |
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if trackArrays[k] then |
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local array = ret[k] |
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array[#array + 1] = v |
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ret[k] = array |
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else |
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ret[k] = {ret[k], v} |
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trackArrays[k] = true |
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end |
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end |
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end |
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end |
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return ret |
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end |
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--[[ |
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------------------------------------------------------------------------------------ |
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-- valueUnion |
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-- |
-- |
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-- This returns the union of the values of n tables, as an array. For example, for |
-- This returns the union of the values of n tables, as an array. For example, for |
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Line 45: | Line 77: | ||
------------------------------------------------------------------------------------ |
------------------------------------------------------------------------------------ |
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--]] |
--]] |
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function p. |
function p.valueUnion(...) |
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local vals, ret = {}, {} |
local vals, ret = {}, {} |
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for i = 1, select('#', ...) do |
for i = 1, select('#', ...) do |
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Line 70: | Line 102: | ||
------------------------------------------------------------------------------------ |
------------------------------------------------------------------------------------ |
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-- intersection |
-- intersection |
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-- |
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-- This returns the intersection of the key/value pairs of n tables. Both the key |
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-- and the value must match to be included in the resulting table. |
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------------------------------------------------------------------------------------ |
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--]] |
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--[[ |
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------------------------------------------------------------------------------------ |
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-- valueIntersection |
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-- |
-- |
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-- This returns the intersection of the values of n tables, as an array. For |
-- This returns the intersection of the values of n tables, as an array. For |
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Line 76: | Line 117: | ||
------------------------------------------------------------------------------------ |
------------------------------------------------------------------------------------ |
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--]] |
--]] |
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function p. |
function p.valueIntersection(...) |
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local vals, ret = {}, {} |
local vals, ret = {}, {} |
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local lim = select('#', ...) |
local lim = select('#', ...) |
Revision as of 21:09, 16 December 2013
Documentation for this module may be created at Module:TableTools/doc
--[[
------------------------------------------------------------------------------------
-- TableTools --
-- --
-- This module includes a number of functions for dealing with Lua tables. --
-- It is a meta-module, meant to be called from other Lua modules, and should --
-- not be called directly from #invoke. --
------------------------------------------------------------------------------------
--]]
local p = {}
-- Define often-used variables and functions.
local floor = math.floor
local infinity = math.huge
-- Define a unique value to represent NaN. This is because NaN cannot be used as a table key.
local nan = {}
--[[
------------------------------------------------------------------------------------
-- isPositiveInteger
--
-- This function returns true if the given number is a positive integer, and false
-- if not. Although it doesn't operate on tables, it is included here as it is
-- useful for determining whether a given table key is in the array part or the
-- hash part of a table.
------------------------------------------------------------------------------------
--]]
function p.isPositiveInteger(num)
if type(num) == 'number' and num >= 1 and floor(num) == num and num < infinity then
return true
else
return false
end
end
--[[
------------------------------------------------------------------------------------
-- union
--
-- This returns the union of the key/value pairs of n tables. If any of the tables
-- contain different values for the same table key, the table value is converted
-- to an array holding all of the different values.
------------------------------------------------------------------------------------
--]]
function p.union(...)
local ret, trackArrays = {}, {}
for i = 1, select('#', ...) do
local t = select(i, ...)
for k, v in pairs(t) do
local retKey = ret[k]
if retKey == nil then
ret[k] = v
elseif retKey ~= v then
if trackArrays[k] then
local array = ret[k]
array[#array + 1] = v
ret[k] = array
else
ret[k] = {ret[k], v}
trackArrays[k] = true
end
end
end
end
return ret
end
--[[
------------------------------------------------------------------------------------
-- valueUnion
--
-- This returns the union of the values of n tables, as an array. For example, for
-- the tables {1, 3, 4, 5, foo = 7} and {2, bar = 3, 5, 6}, union will return
-- {1, 2, 3, 4, 5, 6, 7}.
------------------------------------------------------------------------------------
--]]
function p.valueUnion(...)
local vals, ret = {}, {}
for i = 1, select('#', ...) do
local t = select(i, ...)
for k, v in pairs(t) do
if type(v) == 'number' and tostring(v) == '-nan' then
v = nan -- NaN cannot be a table key, so use a proxy variable.
end
vals[v] = true
end
end
for val in pairs(vals) do
if val == nan then
-- This ensures that we output a NaN when we had one as input, although
-- they may have been generated in a completely different way.
val = 0/0
end
ret[#ret + 1] = val
end
return ret
end
--[[
------------------------------------------------------------------------------------
-- intersection
--
-- This returns the intersection of the key/value pairs of n tables. Both the key
-- and the value must match to be included in the resulting table.
------------------------------------------------------------------------------------
--]]
--[[
------------------------------------------------------------------------------------
-- valueIntersection
--
-- This returns the intersection of the values of n tables, as an array. For
-- example, for the tables {1, 3, 4, 5, foo = 7} and {2, bar = 3, 5, 6},
-- intersection will return {3, 5}.
------------------------------------------------------------------------------------
--]]
function p.valueIntersection(...)
local vals, ret = {}, {}
local lim = select('#', ...)
for i = 1, lim do
local t = select(i, ...)
for k, v in pairs(t) do
if type(v) == 'number' and tostring(v) == '-nan' then
v = nan -- NaN cannot be a table key, so use a proxy variable.
end
local valCount = vals[v] or 0
vals[v] = valCount + 1
end
end
for val, count in pairs(vals) do
if count == lim then
if val == nan then
-- This ensures that we output a NaN when we had one as input, although
-- they may have been generated in a completely different way.
val = 0/0
end
ret[#ret + 1] = val
end
end
return ret
end
--[[
------------------------------------------------------------------------------------
-- numKeys
--
-- This takes a table and returns an array containing the numbers of any numerical
-- keys that have non-nil values, sorted in numerical order.
------------------------------------------------------------------------------------
--]]
function p.numKeys(t)
local isPositiveInteger = p.isPositiveInteger
local nums = {}
for k, v in pairs(t) do
if isPositiveInteger(k) then
nums[#nums + 1] = k
end
end
table.sort(nums)
return nums
end
--[[
------------------------------------------------------------------------------------
-- affixNums
--
-- This takes a table and returns an array containing the numbers of keys with the
-- specified prefix and suffix. For example, for the table
-- {a1 = 'foo', a3 = 'bar', a6 = 'baz'} and the prefix "a", affixNums will
-- return {1, 3, 6}.
------------------------------------------------------------------------------------
--]]
function p.affixNums(t, prefix, suffix)
prefix = prefix or ''
suffix = suffix or ''
local pattern = '^' .. prefix .. '([1-9]%d*)' .. suffix .. '$'
local nums = {}
for k, v in pairs(t) do
if type(k) == 'string' then
local num = mw.ustring.match(k, pattern)
if num then
nums[#nums + 1] = tonumber(num)
end
end
end
table.sort(nums)
return nums
end
--[[
------------------------------------------------------------------------------------
-- compressSparseArray
--
-- This takes an array with one or more nil values, and removes the nil values
-- while preserving the order, so that the array can be safely traversed with
-- ipairs.
------------------------------------------------------------------------------------
--]]
function p.compressSparseArray(t)
local ret = {}
local nums = p.numKeys(t)
for _, num in ipairs(nums) do
ret[#ret + 1] = t[num]
end
return ret
end
--[[
------------------------------------------------------------------------------------
-- sparseIpairs
--
-- This is an iterator for sparse arrays. It can be used like ipairs, but can
-- handle nil values.
------------------------------------------------------------------------------------
--]]
function p.sparseIpairs(t)
local nums = p.numKeys(t)
local i = 0
local lim = #nums
return function ()
i = i + 1
if i <= lim then
local key = nums[i]
return key, t[key]
end
end
end
return p