Module:PropertyLink

function getProperty( propertyName )
    local entity = mw.wikibase.getEntity()
    if not entity or not entity.claims then return end--the entity doesnt exist or have no claims
    local property = entity.claims[propertyName]
    if not property then return end--no such property for this item
    property = property[0]
    local propValue = property.mainsnak and property.mainsnak.datavalue
    if not propValue then return end --property doesnt exist
    if propValue['type'] == 'wikibase-entityid' then
        local linkTarget = mw.wikibase.sitelink( "Q" .. propValue.value['numeric-id'] )
        local linkTitle = mw.wikibase.label( "Q" ..propValue.value['numeric-id'] )
        return linkTarget and linkTitle and mw.ustring.format( "[[%s|%s]]", linkTarget, linkTitle )
            or linkTitle
    elseif propValue and propValue['type'] == 'string' then return propValue.value end
end
 
function property( frame )
    return getProperty(string.lower(frame.args[1]))
end
 
function getLabel( propertyName )
    local entity = mw.wikibase.getEntity()
    if not entity or not entity.claims then return end--the entity doesnt exist or have no claims
    local property = entity.claims[propertyName]
    if not property then return end--no such property for this item
 
    property = property[0]
    local propValue = property.mainsnak.datavalue
    if not propValue then return '' end --property doesnt exist
 
    if propValue['type']=='wikibase-entityid' then
        return mw.wikibase.label( "Q" ..propValue.value['numeric-id'] )
    elseif propValue['type'] == 'string' then
        return propValue.value
    end
end
 
-- Return the label for property, or the label of the linked entiy of that property
function label( frame )
    return getLabel( string.lower(frame.args[1] ))
end
 
function getImageLink( propName, width)
    local entity = mw.wikibase.getEntity()
    if not entity or not entity.claims then return end --the entity doesnt exist or have no claims
    local property = entity.claims[propName or "p18"]
    if property then
        local width = width or "220"
        return mw.ustring.format( '[[File:%s|%spx]]', property[0].mainsnak.datavalue.value, width )
    end
end
 
--use this function to get associated image to be used in the article
function imageLink( frame )
    return getImageLink( string.lower(frame.args[1]), frame.args["width"])
end
 
return {
    imageLink = imageLink,
    Image = imageLink,
    File = imageLink,
    label = label,
    Label = label,
    property = property,
    Property = property,
    getProperty = getProperty,
    getImageLink = getImageLink,
    getLabel = getLabel
}