Module:TableTools: Difference between revisions
add key/value pair union function
m>Mr. Stradivarius (fix lim variable in intersection function) |
m>Mr. Stradivarius (add key/value pair union function) |
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| Line 39: | Line 39: | ||
------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------ | ||
-- union | -- 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 | -- This returns the union of the values of n tables, as an array. For example, for | ||
| Line 45: | Line 77: | ||
------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------ | ||
--]] | --]] | ||
function p. | function p.valueUnion(...) | ||
local vals, ret = {}, {} | local vals, ret = {}, {} | ||
for i = 1, select('#', ...) do | for i = 1, select('#', ...) do | ||
| Line 70: | Line 102: | ||
------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------ | ||
-- intersection | -- 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 | -- This returns the intersection of the values of n tables, as an array. For | ||
| Line 76: | Line 117: | ||
------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------ | ||
--]] | --]] | ||
function p. | function p.valueIntersection(...) | ||
local vals, ret = {}, {} | local vals, ret = {}, {} | ||
local lim = select('#', ...) | local lim = select('#', ...) | ||