عبد العزيز: أنشأ الصفحة ب'-- Helpers for queries using transitive properties local p = {} local wd = require "Module:Wikidata" local function getids(item, query) query.excludespecial = true...'

2016-04-01T16:52:22Z

أنشأ الصفحة ب'-- Helpers for queries using transitive properties local p = {} local wd = require "Module:Wikidata" local function getids(item, query) query.excludespecial = true...'

صفحة جديدة

-- Helpers for queries using transitive properties

local p = {}
local wd = require "Module:Wikidata"

local function getids(item, query)
query.excludespecial = true
query.displayformat = 'raw'
query.entity = item
return wd.stringTable(query)
end

local function alreadyHere(searchset, val)
for i, j in pairs(searchset) do
if val == j then
return true
end
end
return false
end

-- add new items to a list, avoiding duplicates
local function addnewvalues(olditems, newitems, maxnum, stopval)
if not newitems then
return olditems
end
for _, qid in pairs(newitems) do
if stopval and (qid == stopval) then
table.insert(olditems, qid)
return olditems
end
if maxnum and (#olditems >= maxnum) then
return olditems
end
if not alreadyHere(olditems, qid) then
table.insert(olditems, qid)
end
end
return olditems
end

-- recursively adds a list of qid to an existing list, based on the results of a query
function p.addVals(list, query, maxdepth, maxnodes, stopval)
maxdepth = maxdepth or 10
maxnodes = maxnodes or 100
if (maxdepth < 0) then
return list
end
if stopval and alreadyHere(list, stopval) then
return list
end
local origsize = #list
for i = 1, origsize do
-- tried a "checkpos" param instead of starting to 1 each time, but no impact on performance
local candidates = getids(list[i], query)
list = addnewvalues(list, candidates, maxnum, stopval)
if list[#list] == stopval then
return list
end
if #list >= maxnodes then
return list
end
end
if (#list == origsize) then
return list
end
return p.addVals(list, query, maxdepth - 1, maxnodes, stopval, origsize + 1)
end

-- returns a list of items transitively matching a query (orig item is not included in the list)
function p.transitiveVals(item, query, maxdepth, maxnodes, stopval)
maxdepth = maxdepth or 10
local vals = getids(item, query)
if not vals then
return nil
end
return p.addVals(vals, query, maxdepth - 1, maxnodes, stopval)
end

-- returns true if an item is the value of a query, transitively
function p.inTransitiveVals(searchedval, sourceval, query, maxdepth, maxnodes )
local vals = p.transitiveVals(sourceval, query, maxdepth, maxnodes, searchedval )
if vals and vals[#vals] == searchedval then
return true
end
return false
end

-- returns true if an item is a superclass of another, based on P279
function p.isSubclass(class, item, maxdepth)
local query = {property = 'P279'}
if class == item then -- item is a subclass of itself iff it is a class
if getids(item, query) then
return true
end
return false
end
return p.inTransitiveVals(class, item, query, maxdepth )
end

-- returns true if one of the best ranked P31 values of an item is the target or a subclass of the target
-- rank = 'valid' would seem to make sense, but it would need to check for date qualifiers as some P31 values have begin or end date
function p.isInstance(targetclass, item, maxdepth)
maxdepth = maxdepth or 10
local directclasses = p.transitiveVals(item, {property = 'P31'}, 1)
if not directclasses then
return false
end
for i, class in pairs(directclasses) do
if p.isSubclass(targetclass, class, maxdepth - 1) then
return true
end
end
return false
end

return p

وحدة:Wikidata/Analyse transitive - تاريخ المراجعة

عبد العزيز: أنشأ الصفحة ب'-- Helpers for queries using transitive properties local p = {} local wd = require "Module:Wikidata" local function getids(item, query) query.excludespecial = true...'