Yves.bertin : 1 révision importée

2019-02-24T14:17:52Z

1 révision importée

w.fr>Zolo le 11 juin 2017 à 08:33

2017-06-11T08:33:12Z

Nouvelle page

-- Helpers for queries using transitive properties

local p = {}
local wd = require "Module:Wikidata"
local tools = require "Module:Wikidata/Outils"

local function getids(item, query)
query.excludespecial = true
query.displayformat = 'raw'
query.entity = item
return wd.stringTable(query)
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 tools.isHere(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 = tonumber(maxdepth) or 10
maxnodes = tonumber(maxnodes) or 100
if (maxdepth < 0) then
return list
end
if stopval and tools.isHere(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, maxnodes, 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, astring)

maxdepth = tonumber(maxdepth) or 5
if type(query) == "string" then
query = {property = query}
end

-- récupération des valeurs
local vals = getids(item, query)
if not vals then
return nil
end
local v = p.addVals(vals, query, maxdepth - 1, maxnodes, stopval)
if not v then
return nil
end

-- réarrangement des valeurs
if query.valorder == "inverted" then
local a = {}
for i, j in pairs(v) do
table.insert(a, 1, j)
end
v = a
end

-- mise en forme
-- soit sous forme de chaîne
if astring and (astring ~= "-") then
for i, j in pairs(v) do
v[i] = wd.formatEntity(j)
-- il faudrait avoir les optins de mise en forme wd.formatEntity(j, query) mais getids ajoute displayformat = "raw", il faudrait faire d'abord une copie de la table query
end
return wd.tableToText(v, query)
end
--- soit sous forme de table
return v
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 (not vals) then
return false
end
for _, val in ipairs(vals) do
if (val == searchedval) then
return true
end
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 the first value in a transitive query that belongs to a particular class. For instance find a value of P131 that is a province of Canada
function p.findVal(sourceitem, targetclass, query, recursion, instancedepth)
if type(query) == "string" then
query = {property = query}
end
local candidates = getids(sourceitem, query)
if candidates then
for i, j in pairs(candidates) do
if p.isInstance(targetclass, j, instancedepth) then
return j
end
end
if not recursion then
recursion = 3
else
recursion = recursion - 1
end
if recursion < 0 then
return nil
end
for i, candidate in pairs(candidates) do
return p.findVal(candidate, targetclass, query, recursion, instancedepth)
end
end
end

return p

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Yves.bertin : 1 révision importée

w.fr>Zolo le 11 juin 2017 à 08:33