Modulo:Wikidata

local i18n = {
    ["errors"] = {
        ["property-param-not-provided"] = "Parametro ''property'' non fornito.",
        ["entity-not-found"] = "Entità non trovata.",
        ["unknown-claim-type"] = "Tipo asserzione sconosciuta.",
        ["unknown-snak-type"] = "Tipo di snak sconosciuto.",
        ["unknown-datavalue-type"] = "Tipo di dato sconosciuto.",
        ["unknown-entity-type"] = "Tipo di entità sconosciuta.",
        ["unknown-value-module"] = "Devi impostare entrambi i parametri: ''value-module'' e ''value-function''.",
        ["value-module-not-found"] = "Modulo indicato da ''value-module'' non trovato.",
        ["value-function-not-found"] = "Funzione indicata da ''value-function'' non trovata."
    },
    ["somevalue"] = "''valore sconosciuto''",
    ["novalue"] = "''nessun valore''"
}
 
function getEntityFromId( id )
    if id then
        return mw.wikibase.getEntity( id )
    end
    return mw.wikibase.getEntity()
end
 
function getEntityIdFromValue( value )
    local prefix = ''
    if value['entity-type'] == 'item' then
        prefix = 'q'
    elseif value['entity-type'] == 'property' then
        prefix = 'p'
    else
        return formatError( 'unknown-entity-type' )
    end
    return prefix .. value['numeric-id']
end
 
function formatError( key )
    return '<span class="error">' .. i18n.errors[key] .. '</span>'
end
 
 
function formatStatements( options )
    if not options.property then
        return formatError( 'property-param-not-provided' )
    end
 
    --Get entity
    local entity = getEntityFromId( options.entityId )
    if not entity then
        return -- formatError( 'entity-not-found' )
    end
 
    if (entity.claims == nil) or (not entity.claims[string.lower(options.property)]) then
        return '' --TODO error?
    end
 
    --Format statement and concat them cleanly
    local formattedStatements = {}
    local list_end
    if options.list or options.orderedlist then
        if options.list then 
            formattedStatements[1] = '<ul><li>'
            list_end = '</li></ul>'
        else
            formattedStatements[1] = '<ol><li>'
            list_end = '</li></ol>'
        end
        options.separator = '</li><li>'
        options.conjunction = options.separator
    end

    if options.n then
        local n = tonumber(options.n)
        if n then
            local statement = entity.claims[string.lower(options.property)][n - 1]
            if statement then
                table.insert( formattedStatements, formatStatement( statement, options ) )
            end
        end
    else
        for i, statement in pairs( entity.claims[string.lower(options.property)] ) do
            table.insert( formattedStatements, formatStatement( statement, options ) )
        end
    end
    if list_end then table.insert(formattedStatements, list_end) end
    return mw.text.listToText( formattedStatements, options.separator, options.conjunction )
end
 
function formatStatement( statement, options )
    if not statement.type or statement.type ~= 'statement' then
        return formatError( 'unknown-claim-type' )
    end
 
    if options.qualifier then
        return (statement.qualifiers and statement.qualifiers[options.qualifier]) and
               formatDatavalue( statement.qualifiers[options.qualifier][0].datavalue, options ) or ''
    else
        return formatSnak( statement.mainsnak, options )
    end
    --TODO reference
end

function formatSnak( snak, options )
    if snak.snaktype == 'somevalue' then
        return i18n['somevalue']
    elseif snak.snaktype == 'novalue' then
        return i18n['novalue']
    elseif snak.snaktype == 'value' then
        return formatDatavalue( snak.datavalue, options )
    else
        return formatError( 'unknown-snak-type' )
    end
end

function formatDatavalue( datavalue, options )
    local ret

    --Use the customize handler if provided
    if options['value-module'] or options['value-function'] then
        if not options['value-module'] or not options['value-function'] then
            return formatError( 'unknown-value-module' )
        end
        local formatter = require ('Module:' .. options['value-module'])
        if formatter == nil then
            return formatError( 'value-module-not-found' )
        end
        local fun = formatter[options['value-function']]
        if fun == nil then
            return formatError( 'value-function-not-found' )
        end
        return fun( datavalue.value, options )
    end
 
    --Default formatters
    if datavalue.type == 'wikibase-entityid' then
        ret = formatEntityId( getEntityIdFromValue( datavalue.value ), options )
    elseif datavalue.type == 'string' then
        ret = datavalue.value
    elseif datavalue.type == 'time' then
        ret = formatTime( datavalue.value, options )
    elseif datavalue.type == 'globecoordinate' then
        ret = formatGlobecoordinate( datavalue.value, options )
    end

    -- Optional pattern
    if ret then
        return options.pattern and formatFromPattern( ret, options ) or ret
    else
        return formatError( 'unknown-datavalue-type' )
    end
end
 
function formatEntityId( entityId, options )
    local label = mw.wikibase.label( entityId )
    local link = mw.wikibase.sitelink( entityId )
    if link then
        if label then
            return '[[' .. link .. '|' .. label .. ']]'
        else
            return '[[' .. link .. ']]'
        end
    else
        return label --TODO what if no links and label + fallback language?
    end
end

function formatTime( value, options )
    local year, month, day
    local ret = ''
 
    year, month, day = value.time:match('.+(%d%d%d%d%d)%-(%d%d)%-(%d%d).+')
    if value.precision == 9 then
        ret = tonumber(year)
    elseif value.precision == 11 then
        ret = mw.getLanguage('it'):formatDate('j F Y', tonumber(year) .. '-' .. month .. '-' .. day)
    end
    if value.precision == 9 or value.precision == 11 then
        ret = ret .. (value.time:sub(1, 1) == '-' and ' a.C.' or '')
    end

    return ret
end

function formatGlobecoordinate( value, options )
    return value.globe == 'http://www.wikidata.org/entity/Q2' and
           (value.latitude .. ', ' .. value.longitude) or ''
end

function formatFromPattern( str, options )
    -- la parentesi () extra serve per non ritornare anche il gsub.count 
    return ( mw.ustring.gsub( options.pattern, '$1', str ) )
end

-- Ritorna gli argomenti passati al modulo, scartando quelli valorizzati a stringhe vuote
local function getArgs(frame)
    local args = {}
 
    for k, v in pairs(frame.args) do
        if v ~= '' then
            args[k] = v
        end
    end
 
    return args
end

local p = {}
 
function p.formatStatements( frame )
    local args, value

    --value è l'unico parametro che può anche essere una stringa vuota
    value = frame.args.value
    args = getArgs(frame)
 
    --If a value is already set, use it
    if value and value ~= '' then
        return args.pattern and formatFromPattern( value, args ) or value
    end

    return formatStatements( args )
end
 
function p.N(frame) 
    local count = 0

    property = string.lower(frame.args[1])
    entity = mw.wikibase.getEntity()
    if entity and entity.claims and entity.claims[property] then
        for _ in pairs(entity.claims[property]) do count = count + 1 end
    end

    return count
end
 
return p