Изворни код странице Модул:Sources

local p = {};

local i18nDefaultLanguage = 'ru';
local i18nEditors = {
	fr	= '',
	de	= 'Hrsg.: ',
	es	= '',
	en	= '',
	it	= '',
	ru	= 'под ред. ',
}
local i18nEtAlDefault = ' et al.';
local i18nEtAl = {
	ru	= ' и др.',
}
local i18nVolume = {
	fr	= 'Vol.',
	es	= 'Vol.',
	en	= 'Vol.',
	it	= 'Vol.',
	ru	= 'Т.',
}
local i18nIssue = {
	en	= 'Iss.',
	ru	= 'вып.',
}
local i18nPages = {
	fr = 'P.',
	de = 'S.',
	es = 'P.',
	en = 'P.',
	it = 'P.',
	ru = 'С.',
}

local i18nNumberOfPages = {
	en = 'p.',
	ru = 'с.',
}

local NORMATIVE_DOCUMENTS = {
	Q20754888 = 'Закон Российской Федерации',
	Q20754884 = 'Закон РСФСР',
	Q20873831 = 'Распоряжение Президента Российской Федерации',
	Q20873834 = 'Указ исполняющего обязанности Президента Российской Федерации',
	Q2061228 = 'Указ Президента Российской Федерации',
}

local monthg = {'января', 'февраля', 'марта', 'апреля', 'мая', 'июня', 'июля', 'августа', "сентября", "октября", "ноября", "декабря"};

local PREFIX_CITEREF = "CITEREF_";

local options_arxiv = { separator = '; ', conjunction = '; ', format = function( id ) return '[http://arxiv.org/abs/' .. id .. ' arXiv:' .. id .. ']' end, nolinks = true, preferids = false };
local options_doi = { separator = '; ', conjunction = '; ', format = function( doi ) return '[http://dx.doi.org/' .. doi .. ' doi:' .. doi .. ']' end, nolinks = true, preferids = false };

local options_commas = { separator = ', ', conjunction = ', ', format = function( src ) return src end, nolinks = false, preferids = false };
local options_commas_short = { separator = ', ', conjunction = ', ', format = function( src ) return src end, nolinks = false, preferids = false, short = true };
local options_commas_nolinks = { separator = ', ', conjunction = ', ', format = function( src ) return src end, nolinks = true, preferids = false };
local options_commas_it = { separator = ', ', conjunction = ', ', format = function( src ) return "''" .. src .. "''" end, nolinks = false, preferids = false };
local options_commas_it_short = { separator = ', ', conjunction = ', ', format = function( src ) return "''" .. src .. "''" end, nolinks = false, preferids = false, short = true };
local options_commas_it_nolinks = { separator = ', ', conjunction = ', ', format = function( src ) return "''" .. src .. "''" end, nolinks = true , preferids = false };
local options_citetypes = { separator = ' ', conjunction = ' ', format = function( src ) return 'citetype_' .. src end, nolinks = true , preferids = true };

function assertNotNull( argName, arg )
	if ( (not arg) or (arg == nil) ) then
		error( argName .. ' is not specified' )
	end
end

function coalesce( arg1, arg2, arg3, arg4 )
	if ( not isEmpty( arg1 ) ) then return arg1 end
	if ( not isEmpty( arg2 ) ) then return arg2 end
	if ( not isEmpty( arg3 ) ) then return arg3 end
	if ( not isEmpty( arg4 ) ) then return arg4 end
	return nil;
end

function isEmpty( str )
	return ( not str ) or ( str == nil ) or ( #str == 0 );
end

function isInstanceOf( entity, typeEntityId )
	if ( not entity or not entity.claims or not entity.claims.P31 ) then
		return false;
	end

	for _, claim in pairs( entity.claims.P31 ) do
		if ( claim and claim.mainsnak and claim.mainsnak.datavalue and claim.mainsnak.datavalue.value and claim.mainsnak.datavalue.value["numeric-id"] ) then
			local actualTypeId = 'Q' .. claim.mainsnak.datavalue.value["numeric-id"];
			if ( actualTypeId == typeEntityId ) then
				return true;
			end
		end
	end

	return false;
end

function getEntity( context, entityId )
	assertNotNull( 'context', context );
	assertNotNull( 'entityId', entityId );

	local cached = context.cache[ entityId ];
	if ( cached ) then return cached; end;

	local result = mw.wikibase.getEntity( entityId );
	if ( result ) then
		context.cache[ entityId ] = result;
	end

	return result;
end

function toStringSnak( propertyId, strValue )
	assertNotNull('propertyId', strValue)
	assertNotNull('strValue', strValue)

	local snak = { snaktype = "value", property = propertyId, datatype = 'string'};
	snak["datavalue"] = { value = strValue, type = 'string' };
	return snak;
end

function toUrlSnak( propertyId, strValue )
	assertNotNull('propertyId', strValue)
	assertNotNull('strValue', strValue)

	local snak = { snaktype = "value", property = propertyId, datatype = 'string'};
	snak["datavalue"] = { value = strValue, type = 'url' };
	return snak;
end

function toWikibaseEntityIdSnak( propertyId, entityId )
	assertNotNull('propertyId', entityId)
	assertNotNull('entityId', entityId)
	if ( mw.ustring.sub( entityId, 1, 1 ) ~= 'Q' ) then error( 'Incorrect entity ID: «' .. entityId .. '»' ); end;

	local value = {};
	value["entity-type"] = 'item';
	value["numeric-id"] = mw.ustring.sub( entityId , 2);

	local snak = { snaktype = "value", property = propertyId, datatype = 'wikibase-item'};
	snak["datavalue"] = { value = value, type = 'wikibase-entityid' };
	return snak;
end

function renderSource( context, src )
	mw.logObject( src );
	context.lang = getLangCode( getSingle( src.lang ) ) or i18nDefaultLanguage;

	preprocessPlaces( src, context.lang );

	src.title = src.title or getSingle( src.url ) or '\'\'(unspecified title)\'\''

	if ( src.entityId and not src.url ) then
		local entity = getEntity( context, src.entityId );
		if ( entity.sitelinks and entity.sitelinks[ context.lang .. 'wikisource'] ) then
			src.url = ':' .. context.lang .. ':s:' .. entity.sitelinks[ context.lang .. 'wikisource' ].title;
		end
	end

	if ( not src.year and src.dateOfPublication ) then
		local date = getSingle( src.dateOfPublication );
		src.year = mw.ustring.sub( date, 2, 5 );
	end

	if ( not src.year and src.dateOfCreation ) then
		local date = getSingle( src.dateOfCreation );
		src.year = mw.ustring.sub( date, 2, 5 );
	end

	local result;
	if ( src.author ) then
		result = getPeopleAsAuthorWikitext( context, src.author, options_commas );
	end
	if ( not isEmpty( result )) then
		result = '\'\'' .. result .. '\'\' ';
	else
		result = '';
	end
 
 	if ( src.part ) then
 		if ( src.url ) then
			result = result .. wrapInUrl( src.url, toString( context, src.part, options_commas_nolinks ) );
		else
			result = result .. toString( context, src.part, options_commas );
		end
		result = result .. ' // ' .. toString( context, src.title, options_commas );
	else
		-- title only
 		if ( src.url ) then
			result = result .. wrapInUrl( src.url, toString( context, src.title, options_commas_nolinks ) );
		else
			result = result .. toString( context, src.title, options_commas );
		end
 	end

	if ( src.subtitle ) then
		result = result .. ": " .. toString( context, src.subtitle, options_commas );
	end

	if ( src.originaltitle ) then
		result = result .. ' = ' .. toString( context, src.originaltitle, options_commas );
	end

	if ( src.publication ) then
		if ( type( src.publication.title or '') ~= 'string' ) then error('type of src.publication.title is not string but ' .. type( src.publication.title ) ) end;

		result = result .. ' // ' .. toString( context, src.publication, options_commas_it_short );
		if ( src.publication.subtitle ) then
			result = result .. ': ' .. toString( context, src.publication.subtitle, options_commas_it_short );
		end
	end

	if ( src.editor ) then
		local prefix = i18nEditors[ context.lang ] or i18nEditors[ i18nDefaultLanguage ];
		result = result .. ' / ' .. prefix .. toString( context, src.editor, options_commas );
	end

	if ( src.place or src.publisher or src.year ) then
		result = result .. ' — ';
		if ( src.place ) then
			result = result .. toString( context, src.place, options_commas_short );
			if ( src.publisher or src.year ) then
				result = result .. ': ';
			end
		end
		if ( src.publisher ) then
			result = result .. toString( context, src.publisher, options_commas_short );
			if ( src.year ) then
				result = result .. ', ';
			end
		end
		if ( src.year ) then
			result = result .. toString( context, src.year, options_commas );
		end
		result = result .. '.';
	end
 
 	if ( src.volume or src.issue ) then
 		result = result .. ' — ';
		if ( src.volume ) then
			local letter = i18nVolume[ context.lang ] or i18nVolume[ i18nDefaultLanguage ];
			result = result .. letter .. '&nbsp;' .. toString( context, src.volume, options_commas );
			if ( src.issue ) then
				local letter = i18nIssue[ context.lang ] or i18nIssue[ i18nDefaultLanguage ];
				result = result .. ', ' .. letter .. '&nbsp;' .. toString( context, src.issue, options_commas ) .. '.';
			else
				result = result .. '.';
			end
		else
			local letter = i18nIssue[ context.lang ] or i18nIssue[ i18nDefaultLanguage ];
			result = result .. letter .. '&nbsp;' .. toString( context, src.issue, options_commas ) .. '.';
		end
 	end

	if ( src.pages ) then
		local letter = i18nPages[ context.lang ] or i18nPages[ i18nDefaultLanguage ];
		result = result .. ' — ' .. letter .. '&nbsp;' .. toString( context, src.pages, options_commas )  .. '.';
	end

	if ( src.numberOfPages ) then
		local letter = i18nNumberOfPages[ context.lang ] or i18nNumberOfPages[ i18nDefaultLanguage ];
		result = result .. ' — ' .. toString( context, src.numberOfPages, options_commas ) .. '&nbsp;' .. letter;
	end

	if ( src.bookSeries ) then
		result = result .. ' — (' .. toString( context, src.bookSeries, options_commas )

	 	if ( src.bookSeriesVolume or src.bookSeriesIssue ) then
	 		result = result .. '; ';
			if ( src.bookSeriesVolume ) then
				local letter = i18nVolume[ context.lang ] or i18nVolume[ i18nDefaultLanguage ];
				result = result .. letter .. '&nbsp;' .. toString( context, src.bookSeriesVolume, options_commas );
				if ( src.bookSeriesIssue ) then
					local letter = i18nIssue[ context.lang ] or i18nIssue[ i18nDefaultLanguage ];
					result = result .. ', ' .. letter .. '&nbsp;' .. toString( context, src.bookSeriesIssue, options_commas );
				else
					result = result;
				end
			else
				local letter = i18nIssue[ context.lang ] or i18nIssue[ i18nDefaultLanguage ];
				result = result .. letter .. '&nbsp;' .. toString( context, src.bookSeriesIssue, options_commas );
			end
	 	end

		result = result .. ')';
	end

	if ( src.isbn ) then
		result = result .. ' — ISBN ' .. toString( context, src.isbn, options_commas );
	end

	if ( src.issn ) then
		result = result .. ' — ISSN ' .. toString( context, src.issn, options_commas );
	end

	if ( src.doi ) then
		result = result .. ' — ' .. toString( context, src.doi, options_doi );
	end

	if ( src.arxiv ) then
		result = result .. ' — ' .. toString( context, src.arxiv, options_arxiv );
	end

	if ( src.entityId ) then
		if ( src.type and src.entityId ) then
			-- wrap into span to target from JS
			result = '<span class="wikidata_cite ' .. toString( context, src.type, options_citetypes ) .. '" data-entity-id="' .. getSingle( src.entityId ) .. '">' .. result .. '</span>'
		else
			result = '<span class="wikidata_cite citetype_unknown" data-entity-id="' .. getSingle( src.entityId ) .. '">' .. result .. '</span>'
		end
	end

	if ( src.accessdate ) then
			local date = getSingle( src.accessdate );
			local pattern = "(%-?%d+)%-(%d+)%-(%d+)T";
			local y, m, d = mw.ustring.match( date , pattern );
			y,m,d = tonumber(y),tonumber(m),tonumber(d);
			result = result .. " <small>Проверено " .. tostring(d) .. " " .. monthg[m]  .. " " .. tostring(y) .. ".</small>";
	end

    -- append invisible links to all elements used by source for tracking purposes
    local result = result .. '<div style="display:none">';
	for key, entity in pairs( context.cache ) do
		result = result .. '[[d:Track:' .. key .. ']]';
	end
    result = result ..'</div>'

	return {text = result, code = src.code};
end

function wrapInUrl( urls, text )
	local url = getSingle( urls );
	if ( string.sub( url, 1, 1 ) == ':' ) then
		return '[[' .. url .. '|' .. text .. ']]';
	else
		return '[' .. url .. ' ' .. text .. ']';
	end
end

function renderShortReference( src )
	context = {
		cache = {},
		lang = getSingle( src.lang ) or i18nDefaultLanguage;
	};
	src.title = src.title or '\'\'(unspecified title)\'\''

	local result = '[[#' .. PREFIX_CITEREF .. src.code .. '|';
	if ( src.author ) then
		result = result .. toString( context, src.author, options_authors_nolinks );
	else
		result = result .. toString( context, src.title, options_commas_it_nolinks );
	end
	result = result .. ']]'

	if ( src.year ) then
		result = result .. ', ' .. toString( context, src.year, options_commas );
	end

	if ( src.volume ) then
		local letter = i18nVolume[ context.lang ] or i18nVolume[ i18nDefaultLanguage ];
		result = result .. ' — ' .. letter .. '&nbsp;' .. toString( context, src.volume, options_commas ) .. '.';
	end

	if ( src.issue ) then
		local letter = i18nIssue[ context.lang ] or i18nIssue[ i18nDefaultLanguage ];
		result = result .. ' — ' .. letter .. '&nbsp;' .. toString( context, src.issue, options_commas ) .. '.';
	end
 
	if ( src.pages ) then
		local letter = i18nPages[ context.lang ] or i18nPages[ i18nDefaultLanguage ];
		result = result .. ' — ' .. letter .. '&nbsp;' .. toString( context, src.pages, options_commas )  .. '.';
	end
 
end

function getSingle( value )
	if ( not value ) then
		return;
	end
	if ( type( value ) == 'string' ) then
		return value;
	elseif ( type( value ) == 'table' ) then
		if ( value.id ) then
			return value.id;
		end

		for i, tableValue in pairs( value ) do
			return getSingle( tableValue );
		end
	end

	return '(unknown)';
end

function toString( context, value, options )
	if ( type( value ) == 'string' ) then
		return options.format( value );
	elseif ( type( value ) == 'table' ) then
		if ( value.id ) then
			-- this is link
			if ( type( value.label or '' ) ~= 'string' ) then mw.logObject( value ); error('label of table value is not string but ' .. type( value.label ) ) end

			if ( options.preferids ) then
				return options.format( value.id );
			else
				if ( options.nolinks ) then
					return options.format( value.label or mw.wikibase.label( value.id ) or '\'\'(untranslated title)\'\'' );
				else
					return options.format( renderLink( context, value.id, value.label, options ) );
				end
			end
		end

		local resultList = {};
		for i, tableValue in pairs( value ) do
			table.insert( resultList, toString( context, tableValue, options ) );
		end

		return mw.text.listToText( resultList, options.separator, options.conjunction);
	else
		return options.format( '(unknown type)' );
	end

	return '';
end

function renderLink( context, entityId, customTitle, options )
	if ( not entityId ) then error("entityId is not specified") end
	if ( type( entityId ) ~= 'string' ) then error('entityId is not string, but ' .. type( entityId ) ) end
	if ( type( customTitle or '' ) ~= 'string' ) then error('customTitle is not string, but ' .. type( customTitle ) ) end

	local title = customTitle;

	if ( isEmpty( title ) ) then
		local entity = getEntity( context, entityId );

		-- ISO 4
		if ( isEmpty( title ) ) then
			if ( entity.claims and entity.claims.P1160 ) then
				for _, claim in pairs( entity.claims.P1160 ) do
					if ( claim
							and claim.mainsnak
							and claim.mainsnak.datavalue
							and claim.mainsnak.datavalue.value
							and claim.mainsnak.datavalue.value.language == context.lang ) then
						title = claim.mainsnak.datavalue.value.text;
						mw.log('Got title of ' .. entityId .. ' from ISO 4 claim: «' .. title .. '»' )
						break;
					end
				end
			end
		end

		-- official name P1448
		-- short name P1813
		if ( isEmpty( title ) and options.short ) then
			if ( entity.claims and entity.claims.P1813 ) then
				for _, claim in pairs( entity.claims.P1813 ) do
					if ( claim
							and claim.mainsnak
							and claim.mainsnak.datavalue
							and claim.mainsnak.datavalue.value
							and claim.mainsnak.datavalue.value.language == context.lang ) then
						title = claim.mainsnak.datavalue.value.text;
						mw.log('Got title of ' .. entityId .. ' from short name claim: «' .. title .. '»' )
						break;
					end
				end
			end
		end
		-- person name P1559
		-- labels
		if ( isEmpty( title ) and entity.labels[ context.lang ] ) then
			title = entity.labels[ context.lang ].value;
			mw.log('Got title of ' .. entityId .. ' from label: «' .. title .. '»' )
		end
	end

	local actualText = title or '\'\'(untranslated)\'\'';
	local link = getElementLink( context, entityId, entity);
	return wrapInUrl( link, actualText );
end

function getElementLink( context, entityId, entity )
	-- fast sitelink lookup, not an expensive operation
	local link = mw.wikibase.sitelink( entityId )
	if ( link ) then return ':' .. link end

	if ( not entity and entityId ) then
		entity = getEntity( context, entityId )
	end

	if ( entity ) then
		-- link to entity in source context language
		local projectToCheck = context.lang .. 'wiki';
		if ( entity.sitelinks and entity.sitelinks[ projectToCheck ] ) then
			return ':' .. context.lang .. ':' .. entity.sitelinks[ projectToCheck ].title;
		end
	end

	if ( entityId ) then return ':d:' .. entityId end;
	-- if ( entityId ) then return 'https://tools.wmflabs.org/reasonator/?q=' .. entityId .. '&lang=ru' end;
	return nil;
end

function getPeopleAsAuthorWikitext( context, value, options )
	if ( type( value ) == 'string' ) then
		return personNameToAuthorName( value );
	elseif ( type( value ) == 'table' ) then
		if ( value.id ) then
			-- this is link
			if ( options.preferids ) then
				return value.id;
			else
				if ( options.nolinks ) then
					return getPersonNameAsAuthorLabel( context, value.id, value.label, options );
				else
					return getPersonNameAsAuthorWikitext( context, value.id, value.label, options );
				end
			end
		end

		local resultList = {};
		for i, tableValue in pairs( value ) do
			local nextWikitext = getPeopleAsAuthorWikitext( context, tableValue, options );
			if ( not isEmpty( nextWikitext ) ) then
				table.insert( resultList, nextWikitext );
				if ( #resultList == 4 ) then
					-- even 4 is too much, but we preserve 4th to mark that "it's more than 3"
					break;
				end
			end
		end

		local resultWikitext = '';
		for i, wikitext in pairs( resultList ) do
			if ( i == 4 ) then
				resultWikitext = resultWikitext .. ( i18nEtAl[ context.lang ] or i18nEtAlDefault );
				break;
			end
			if ( i ~= 1 ) then
				resultWikitext = resultWikitext .. ', ';
			end
			resultWikitext = resultWikitext .. wikitext;
		end

		return resultWikitext;
	end

	return options.format( '(unknown type)' );
end

function getPersonNameAsAuthorWikitext( context, entityId, customLabel, options )
	local personNameAsAuthor = getPersonNameAsAuthorLabel( context, entityId, customLabel, options);
	if ( personNameAsAuthor == nil ) then
		return nil;
	end

	local link = getElementLink( context, entityId, nil );
	return wrapInUrl( link, personNameAsAuthor );
end

function getPersonNameAsAuthorLabel( context, entityId, providedLabel, options )
	-- would custom label provided we don't need to check entity at all
	if ( not isEmpty( providedLabel ) ) then
		mw.log( 'Custom label provided for ' .. entityId );
		return personNameToAuthorName( providedLabel );
	end

	local entity = getEntity( context, entityId );
	if ( not entity ) then return '\'\'(entity ' .. entityId .. ' is missing)\'\'' end;
	if ( not isInstanceOf( entity, 'Q5' ) ) then
		mw.log( 'Entity ' .. entityId .. ' is not a person' );
		return nil;
	end

	local personName = nil;
	-- support only labels so far
	if ( entity.labels[ context.lang ] ) then
		personName = entity.labels[ context.lang ].value;
		mw.log('Got person name of ' .. entityId .. ' from label: «' .. personName .. '»' )
	end

	if ( isEmpty( personName ) ) then
		return '\'\'(not translated to ' .. context.lang .. ')\'\'';
	else
		return personNameToAuthorName( personName );
	end
end

function personNameToAuthorName( fullName )
	if ( not fullName ) then return fullName; end

	local f, i, o = mw.ustring.match( fullName, '^%s*(%a[%a\-]*)\,%s(%a[%a\-]*)%s(%a[%a\-]*)%s*$' );
	if ( f ) then
		mw.log( 'personNameToAuthorName: «' .. fullName .. '»: have «Fa, I. O.» match' );
		return f .. '&nbsp;'
			.. mw.ustring.sub( i, 1, 1 ) .. '.&nbsp;'
			.. mw.ustring.sub( o, 1, 1 ) .. '.';
	end

	local f1, f2, i = mw.ustring.match( fullName, '^%s*(%a[%a\-]*)%s(%a[%a\-]*)\,%s(%a[%a\-]*)%s*$' );
	if ( f1 ) then
		mw.log( 'personNameToAuthorName: «' .. fullName .. '»: have «Fa Fa, I» match' );
		return f1 .. '&nbsp;' .. f2 .. '&nbsp;'
			.. mw.ustring.sub( i, 1, 1 ) .. '.';
	end

	local i, o, f = mw.ustring.match( fullName, '^%s*(%a)\.%s(%a)\.%s(%a[%a\-]+)%s*$');
	if ( f ) then
		mw.log( 'personNameToAuthorName: «' .. fullName .. '»: have «I. O. Fa» match' );
		return f .. '&nbsp;' .. i .. '.&nbsp;' .. o .. '.';
	end

	local i1, i2, i3, f = mw.ustring.match( fullName, '^%s*(%a)\.%s(%a)\.%s(%a)\.%s(%a[%a\-]+)%s*$');
	if ( f ) then
		mw.log( 'personNameToAuthorName: «' .. fullName .. '»: have «I. O. ?. Fa» match' );
		return f .. '&nbsp;' .. i1 .. '.&nbsp;' .. i2 .. '.&nbsp;' .. i3 .. '.';
	end

    -- Joel J. P. C. Rodrigues
	local i1, i2, i3, i4, f = mw.ustring.match( fullName, '^%s*(%a)[%a\-]+%s(%a)\.%s(%a)\.%s(%a)\.%s(%a[%a\-]+)%s*$');
	if ( f ) then
		mw.log( 'personNameToAuthorName: «' .. fullName .. '»: have «I. O. ?. Fa» match' );
		return f .. '&nbsp;' .. i1 .. '.&nbsp;' .. i2 .. '.&nbsp;' .. i3 .. '.&nbsp;' .. i4 .. '.';
	end

	local i, o, f = mw.ustring.match( fullName, '^%s*(%a[%a\-]*)%s(%a)\.%s(%a[%a\-]*)%s*$');
	if ( f ) then
		mw.log( 'personNameToAuthorName: «' .. fullName .. '»: have «Im O. Fa» match' );
		return f .. '&nbsp;' .. mw.ustring.sub( i, 1, 1 ) .. '.&nbsp;' .. o .. '.';
	end

	local i, o, f = mw.ustring.match( fullName, '^%s*(%a[%a\-]*)%s(%a[%a\-]*)%s(%a[%a\-]*)%s*$');
	if ( f ) then
		mw.log( 'personNameToAuthorName: «' .. fullName .. '»: have «Im Ot Fa» match' );
		return f .. '&nbsp;' .. mw.ustring.sub( i, 1, 1 ) .. '.&nbsp;' .. mw.ustring.sub( o, 1, 1 ) .. '.';
	end

	local i, o, f = mw.ustring.match( fullName, '^%s*(%a[%a\-]+)%s(%a[%a\-]+)%s+оглы%s+(%a[%a\-]+)%s*$');
	if ( f ) then
		mw.log( 'personNameToAuthorName: «' .. fullName .. '»: have «Im Ot оглы Fa» match' );
		return f .. '&nbsp;' .. mw.ustring.sub( i, 1, 1 ) .. '.&nbsp;' .. mw.ustring.sub( o, 1, 1 ) .. '.';
	end

	local i, f = mw.ustring.match( fullName, '^%s*(%a[%a\-]+)%s(%a[%a\-]+)%s*$');
	if ( f ) then
		mw.log( 'personNameToAuthorName: «' .. fullName .. '»: have «Im Fa» match' );
		return f .. '&nbsp;' .. mw.ustring.sub( i, 1, 1 ) .. '.';
	end

	mw.log( 'Unmatched any pattern: «' .. fullName .. '»' );
	return fullName;
end

-- Expand special types of references when additional data could be found in OTHER entity properties
function expandSpecials( currentEntity, reference, data )
	if ( reference.snaks.P248
			and reference.snaks.P248[1]
			and reference.snaks.P248[1].datavalue
			and reference.snaks.P248[1].datavalue.value["numeric-id"]) then
		local sourceId = "Q" .. reference.snaks.P248[1].datavalue.value["numeric-id"];

		-- Gemeinsame Normdatei -- specified by P227
		if ( sourceId == 'Q36578' ) then
			appendSnaks( currentEntity.claims, 'P227', data, 'title', { format = function( gnd ) return 'Record #' .. gnd; end } );
			appendSnaks( currentEntity.claims, 'P227', data, 'url', { format = function( gnd ) return 'http://d-nb.info/gnd/' .. gnd .. '/'; end } );
			data.publication = { id = 'Q36578', label = 'Gemeinsame Normdatei' }
			data.year = '2012—2015'
		end

		-- BNF -- specified by P268
		if ( sourceId == 'Q15222191' ) then
			appendSnaks( currentEntity.claims, 'P268', data, 'title', { format = function( id ) return 'Record #' .. id; end } );
			appendSnaks( currentEntity.claims, 'P268', data, 'url', { format = function( id ) return 'http://catalogue.bnf.fr/ark:/12148/cb' .. id; end } );
			expandSpecialsQualifiers( currentEntity, 'P268', data );
		end

		-- Find a Grave -- specified by P535
		if ( sourceId == 'Q63056' ) then
			appendSnaks( currentEntity.claims, 'P535', data, 'url', { format = function( id ) return 'http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=' .. id; end } );
			expandSpecialsQualifiers( currentEntity, 'P535', data );
		end

		--  Dizionario Biografico degli Italiani -- specified by P1986
		if ( sourceId == 'Q1128537' ) then
			if ( not data.lang ) then data.lang = { id = 'Q652' } end;
			appendSnaks( currentEntity.claims, 'P1986', data, 'url', { format = function( id ) return 'http://www.treccani.it/enciclopedia/' .. id .. '_%28Dizionario_Biografico%29/' end } );
			expandSpecialsQualifiers( currentEntity, 'P1986', data );
		end

		-- Union List of Artist Names -- specified by P245
		if ( sourceId == 'Q2494649' ) then
			appendSnaks( currentEntity.claims, 'P245', data, 'url', { format = function( id ) return 'http://www.getty.edu/vow/ULANFullDisplay?find=&role=&nation=&subjectid=' .. id end } );
			expandSpecialsQualifiers( currentEntity, 'P245', data );
		end

		-- Gran Enciclopèdia Catalana -- specified by P1296
		if ( sourceId == 'Q2664168' ) then
			appendSnaks( currentEntity.claims, 'P1296', data, 'url', { format = function( id ) return 'http://www.enciclopedia.cat/enciclop%C3%A8dies/gran-enciclop%C3%A8dia-catalana/EC-GEC-' .. id .. '.xml'; end } );
			expandSpecialsQualifiers( currentEntity, 'P1296', data );
		end

		-- Encyclopædia Britannica online -- specified by P1417
		if ( sourceId == 'Q5375741' ) then
			appendSnaks( currentEntity.claims, 'P1417', data, 'url', { format = function( id ) return 'http://global.britannica.com/' .. id; end } );
			expandSpecialsQualifiers( currentEntity, 'P1417', data );
		end

		-- Electronic Jewish Encyclopedia (Elektronnaja Evrejskaja Entsiklopedia) -- specified by P1438
		if ( sourceId == 'Q1967250' ) then
			appendSnaks( currentEntity.claims, 'P1438', data, 'url', { format = function( id ) return 'http://www.eleven.co.il/article/' .. id; end } );
			expandSpecialsQualifiers( currentEntity, 'P1438', data );
		end

		-- sports-reference.com -- specified by P1447
		if ( sourceId == 'Q18002875' ) then
			appendSnaks( currentEntity.claims, 'P1447', data, 'url', { format = function( id ) return 'http://www.sports-reference.com/olympics/athletes/' .. id .. '.html'; end } );
			expandSpecialsQualifiers( currentEntity, 'P1447', data );
		end
	end
end

function expandSpecialsQualifiers( entity, propertyId, result )
	if ( entity.claims ~= nil and entity.claims[propertyId] ~= nil ) then
		local claims = entity.claims[propertyId];
		appendQualifiers( claims, 'P958', result, 'part', {} );
		appendQualifiers( claims, 'P953', result, 'url', {} );
		appendQualifiers( claims, 'P1065', result, 'url', {} );
		appendQualifiers( claims, 'P854', result, 'url', {} );
		appendQualifiers( claims, 'P357', result, 'title', {} ); -- obsolete
		appendQualifiers( claims, 'P1476', result, 'title', {} );
		appendQualifiers( claims, 'P478', result, 'volume', {} );
		appendQualifiers( claims, 'P433', result, 'issue', {} );
	end
end

function findClaimsByValue( entity, propertyId, value )
	local result = {};
	if ( entity and entity.claims and entity.claims[propertyId] ) then
		for i, claim in pairs( entity.claims[propertyId] ) do
			if ( claim.mainsnak and claim.mainsnak.datavalue ) then
				local datavalue = claim.mainsnak.datavalue;
				if ( datavalue.type == "string" and datavalue.value == value 
					or datavalue.type == "wikibase-entityid" and datavalue.value["entity-type"] == "item" and tostring( datavalue.value["numeric-id"] ) == mw.ustring.sub( value, 2 ) ) then
					table.insert( result, claim );
				end
			end
		end
	end
	return result;
end

function appendSnaks( allSnaks, snakPropertyId, result, property, options )
	-- do not populate twice
	if ( result[property] ) then return result end;
	if ( not allSnaks ) then return result; end;
	
	local selectedSnakes = allSnaks[ snakPropertyId ];
	if ( not selectedSnakes ) then return result; end;

	local hasPreferred = false;
	for k, snak in pairs( selectedSnakes ) do
		if ( snak and snak.mainsnak and snak.mainsnak.datavalue and snak.rank == 'preferred' ) then
			--it's a preferred claim
			appendImpl( snak.mainsnak.datavalue, snak.qualifiers, result, property, options );
			hasPreferred = true;
		end
	end
	if ( hasPreferred ) then return result; end;

	for k, snak in pairs( selectedSnakes ) do
		if ( snak and snak.mainsnak and snak.mainsnak.datavalue and snak.rank ~= 'deprecated' ) then
			--it's a claim
			appendImpl( snak.mainsnak.datavalue, snak.qualifiers, result, property, options );
		elseif ( snak and snak.datavalue ) then
			-- it's a snak
			appendImpl( snak.datavalue, nil, result, property, options );
		end
	end
end

function appendQualifiers( claims, qualifierPropertyId, result, resultProperty, options )
	-- do not populate twice
	if ( not claims ) then return result end;
	if ( result[resultProperty] ) then return result end;

	for i, claim in pairs( claims ) do
		if ( claim.qualifiers and claim.qualifiers[ qualifierPropertyId ] ) then
			for k, qualifier in pairs( claim.qualifiers[ qualifierPropertyId ] ) do
				if ( qualifier and qualifier.datavalue ) then
					appendImpl( qualifier.datavalue, nil, result, resultProperty, options );
				end
			end
		end
	end
end

function appendImpl( datavalue, qualifiers, result, property, options )
	if ( datavalue.type == 'string' ) then
		local value = datavalue.value;
		if ( options.format ) then
			value = options.format( value );
		end
		appendImpl_toTable( result, property );
		table.insert( result[property], value);
	elseif ( datavalue.type == 'monolingualtext' ) then
		local value = datavalue.value.text;
		if ( options.format ) then
			value = options.format( value );
		end
		appendImpl_toTable( result, property );
		table.insert( result[property], value);
	elseif ( datavalue.type == 'quantity' ) then
		local value = datavalue.value.amount;
		if ( mw.ustring.sub( value , 1, 1 ) == '+' ) then
			value = mw.ustring.sub( value , 2 );
		end
		if ( options.format ) then
			value = options.format( value );
		end
		appendImpl_toTable( result, property );
		table.insert( result[property], value);
	elseif ( datavalue.type == 'wikibase-entityid' ) then
		local value = datavalue.value;
		appendImpl_toTable( result, property );
		local toInsert = {
			id = 'Q' .. value["numeric-id"],
			label = getSingleStringQualifierValue(qualifiers, 'P1932') -- stated as
		};
		table.insert( result[property], toInsert );
	elseif datavalue.type == 'time' then
		local value = datavalue.value;
		if ( options.format ) then
			value = options.format( value );
		end
		appendImpl_toTable( result, property );
		table.insert( result[property], tostring( value.time ));
    end 
end

function appendImpl_toTable(result, resultProperty)
	if ( not result[resultProperty] ) then
		result[resultProperty] = {};
	elseif ( type( result[resultProperty] ) == 'string' or ( type( result[resultProperty] ) == 'table' and type( result[resultProperty].id ) == 'string' ) ) then
		result[resultProperty] = { result[resultProperty] };
	end
end

function getSingleStringQualifierValue( allQualifiers, qualifierPropertyId )
	if ( not allQualifiers ) then return end
	if ( not allQualifiers[qualifierPropertyId] ) then return end

	for k, qualifier in pairs( allQualifiers[qualifierPropertyId] ) do
		if ( qualifier and qualifier.datatype == 'string'
				and qualifier.datavalue and qualifier.datavalue.type == 'string' and not isEmpty( qualifier.datavalue.value ) ) then
			return qualifier.datavalue.value;
		end
	end

	return;
end

function expandDescribed ( context, sourceEntity, data )
	local described = data.described;

	-- use only first one
	if ( type( described ) == 'table' and described[1] and described[1].id ) then
		data.described = described[1];
		described = data.described;
	end

	data.publication = data.described;

	if ( described and described.id ) then
		if ( sourceEntity ) then
			-- do we have appropriate record in P1433 ?
			local claims = findClaimsByValue( sourceEntity, 'P1343', described.id );
			if ( claims and #claims ~= 0 ) then
				appendQualifiers( claims, 'P958', data, 'part', {} );
				appendQualifiers( claims, 'P50', data, 'author', {} );
				appendQualifiers( claims, 'P953', data, 'url', {} );
				appendQualifiers( claims, 'P1065', data, 'url', {} );
				appendQualifiers( claims, 'P854', data, 'url', {} );
				appendQualifiers( claims, 'P357', data, 'title', {} ); -- obsolete
				appendQualifiers( claims, 'P1476', data, 'title', {} );
				appendQualifiers( claims, 'P478', data, 'volume', {} );
			end
		end
		local titleWerePresent = not (not data.title);
		local desEntity = getEntity( context, described.id );
		if ( desEntity ) then
			populateSourceDataImpl( desEntity, data );
			if ( titleWerePresent and isEmpty( data.publication.label ) ) then
				appendSnaks( desEntity.claims, 'P1160', data, 'publication-title', {} ); -- obsolete
				data.publication.label = getSingle( data['publication-title'] );
			end
			if ( titleWerePresent and isEmpty( data.publication.label ) ) then
				appendSnaks( desEntity.claims, 'P357', data, 'publication-title', {} ); -- obsolete
				appendSnaks( desEntity.claims, 'P1476', data, 'publication-title', {} );
				appendSnaks( desEntity.claims, 'P1680', data, 'publication-subtitle', {} );
				data.publication.label = getSingle( data['publication-title'] );
				data.publication.subtitle = getSingle( data['publication-subtitle'] );
			end
		end
	end
end

function expandPublication( context, sourceEntity, data )
	local publication = data.publication;

	-- use only first one
	if ( type( publication ) == 'table' and publication[1] and publication[1].id ) then
		data.publication = publication[1];
		publication = data.publication;
	end

	if ( not publication ) then return end;
	if ( not publication.id ) then return end;

	if ( sourceEntity ) then
		-- do we have appropriate record in P1433 ?

		local claims = findClaimsByValue( sourceEntity, 'P1433', publication.id );
		if ( claims and #claims ~= 0 ) then
			appendQualifiers( claims, 'P958', data, 'part', {} );
			appendQualifiers( claims, 'P953', data, 'url', {} );
			appendQualifiers( claims, 'P1065', data, 'url', {} );
			appendQualifiers( claims, 'P854', data, 'url', {} );
			appendQualifiers( claims, 'P856', data, 'url', {} );
			appendQualifiers( claims, 'P123', data, 'publisher', {} );
			appendQualifiers( claims, 'P291', data, 'place', {} );
			appendQualifiers( claims, 'P304', data, 'pages', {} );
			appendQualifiers( claims, 'P1104', data, 'numberOfPages', {} );
			appendQualifiers( claims, 'P478', data, 'volume', {} );
			appendQualifiers( claims, 'P433', data, 'issue', {} );
			appendQualifiers( claims, 'P571', data, 'dateOfCreation', {} );
			appendQualifiers( claims, 'P577', data, 'dateOfPublication', {} );
			appendQualifiers( claims, 'P212', data, 'isbn', {} ); -- ISBN-13
			appendQualifiers( claims, 'P957', data, 'isbn', {} ); -- ISBN-10
		end
	end

	local titleWerePresent = not (not data.title);
	local pubEntity = getEntity( context, publication.id );
	populateSourceDataImpl( pubEntity, data );
	if ( titleWerePresent and isEmpty( data.publication.label ) ) then
		appendSnaks( pubEntity.claims, 'P1160', data, 'publication-title', {} ); -- obsolete
		data.publication.label = getSingle( data['publication-title'] );
	end
	if ( titleWerePresent and isEmpty( data.publication.label ) ) then
		appendSnaks( pubEntity.claims, 'P357', data, 'publication-title', {} ); -- obsolete
		appendSnaks( pubEntity.claims, 'P1476', data, 'publication-title', {} );
		appendSnaks( pubEntity.claims, 'P1680', data, 'publication-subtitle', {} );
		data.publication.label = getSingle( data['publication-title'] );
		data.publication.subtitle = getSingle( data['publication-subtitle'] );
	end

	if ( pubEntity.claims and pubEntity.claims.P361 ) then
		for c, claim in pairs( pubEntity.claims.P361 ) do
			if ( claim and claim.mainsnak and claim.mainsnak.datavalue and claim.mainsnak.datavalue.value and claim.mainsnak.datavalue.value["numeric-id"] ) then
				local possibleBookSeriesEntityId = 'Q' .. claim.mainsnak.datavalue.value["numeric-id"];
				local possibleBookSeriesEntity = getEntity( context, possibleBookSeriesEntityId );
				if ( isInstanceOf( possibleBookSeriesEntity, 'Q277759' ) ) then
					appendImpl_toTable( data, 'bookSeries' );
					table.insert( data.bookSeries, { id = possibleBookSeriesEntityId } );

					appendQualifiers( { claim }, 'P478', data, 'bookSeriesVolume', {} );
					appendQualifiers( { claim }, 'P433', data, 'bookSeriesIssue', {} );
				end
			end
		end
	end

	expandBookSeries( context, data );
end

function expandBookSeries( context, data )
	local bookSeries = data.bookSeries;
	if ( not bookSeries ) then return end;

	-- use only first one
	if ( type( bookSeries ) == 'table' and bookSeries[1] and bookSeries[1].id ) then
		data.bookSeries = bookSeries[1];
		bookSeries = data.bookSeries;
	end

	if ( not bookSeries ) then return end;
	if ( not bookSeries.id ) then return end;

	local bookSeriesEntity = getEntity( context, bookSeries.id );
	appendSnaks( bookSeriesEntity.claims, 'P123', data, 'publisher', {} );
	appendSnaks( bookSeriesEntity.claims, 'P291', data, 'place', {} );
	appendSnaks( bookSeriesEntity.claims, 'P236', data, 'issn', {} );
end

function populateSourceDataImpl( entity, plainData )
	populateDataFromClaims( entity.id, entity.claims, plainData );

	local normativeTitle = getNormativeTitle( entity )
	if ( normativeTitle ) then
		local y, m, d = mw.ustring.match( getSingle( plainData.dateOfCreation ) , "(%-?%d+)%-(%d+)%-(%d+)T" );
		y,m,d = tonumber(y),tonumber(m),tonumber(d);
		local title = toString( { lang='ru' }, plainData.title, options_commas_nolinks );
		plainData.title = { normativeTitle .. " от&nbsp;" .. tostring(d) .. "&nbsp;" .. monthg[m]  .. " " .. tostring(y) .. "&nbsp;г. №&nbsp;" .. getSingle( plainData.docNumber ) .. ' «' .. title.. '»' }
	end

	if ( not plainData.title ) then
		if ( entity.labels and entity.labels.ru and entity.labels.ru.value ) then
			plainData.title = { entity.labels.ru.value };
		end
	end

	return plainData;
end

function populateDataFromClaims( entityId, claims, data )
	appendSnaks( claims, 'P50', data, 'author', {} );
	appendSnaks( claims, 'P407', data, 'lang', {} );
	appendSnaks( claims, 'P364', data, 'lang', {} );
	appendSnaks( claims, 'P958', data, 'part', {} );
	if ( not data.title ) then
		if ( not isEmpty( entityId ) ) then
			local optionsAsLinks = { format = function( text ) return { id = entityId, label = text } end };
			appendSnaks( claims, 'P357', data, 'title', optionsAsLinks ); -- obsolete
			appendSnaks( claims, 'P1476', data, 'title', optionsAsLinks );
		else
			appendSnaks( claims, 'P357', data, 'title', {} ); -- obsolete
			appendSnaks( claims, 'P1476', data, 'title', {} );
		end
		appendSnaks( claims, 'P1680', data, 'subtitle', {} );
	end
	appendSnaks( claims, 'P953', data, 'url', {} );
	appendSnaks( claims, 'P1065', data, 'url', {} );
	appendSnaks( claims, 'P854', data, 'url', {} );
	appendSnaks( claims, 'P856', data, 'url', {} );
	appendSnaks( claims, 'P1343', data, 'described', {} );
	appendSnaks( claims, 'P1433', data, 'publication', {} );
	appendSnaks( claims, 'P123', data, 'publisher', {} );
	appendSnaks( claims, 'P291', data, 'place', {} );
	appendSnaks( claims, 'P304', data, 'pages', {} );
	appendSnaks( claims, 'P1104', data, 'numberOfPages', {} );
	appendSnaks( claims, 'P478', data, 'volume', {} );
	appendSnaks( claims, 'P433', data, 'issue', {} );
	appendSnaks( claims, 'P571', data, 'dateOfCreation', {} );
	appendSnaks( claims, 'P577', data, 'dateOfPublication', {} );
	appendSnaks( claims, 'P212', data, 'isbn', {} ); -- ISBN-13
	appendSnaks( claims, 'P957', data, 'isbn', {} ); -- ISBN-10
	appendSnaks( claims, 'P236', data, 'issn', {} );
	
    -- web
	-- appendSnaks( claims, 'P813', data, 'accessdate', {} );

    -- docs
	appendSnaks( claims, 'P1545', data, 'docNumber', {} );

	-- other
	appendSnaks( claims, 'P31', data, 'type', {} );

	appendSnaks( claims, 'P818', data, 'arxiv', {} );
	appendSnaks( claims, 'P356', data, 'doi', {} );
	-- JSTOR
	appendSnaks( claims, 'P888', data, 'url', { format = function( id ) return 'http://www.jstor.org/stable/' .. id end } );

	return src;
end

function updateWithRef( reference, src )
	-- specified
	if ( reference.snaks.P662 ) then
		local cid = reference.snaks.P662[1].datavalue.value;
		src.code = src.code .. '-cid:' .. cid;
		src.title = 'Compound Summary for: CID ' .. cid;
		src.url = 'http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=' .. cid;
		src.publication = { id = 'Q278487', label = 'PubChem' };
	end

	populateDataFromClaims( nil, reference.snaks, src);
	return src;
end

function p.renderSource( frame )
	p.currentFrame = frame;

	local arg = frame.args[1];
	local refAnchor = frame.args['ref'];
	local refAnchorYear = frame.args['ref-year'];
	local args = {};
	args.refAnchor = frame.args['ref'];
	args.refAnchorYear = frame.args['ref-year'];
	args.part = frame.args['part'];
	args.pages = frame.args['pages'];

	return p.renderSourceImpl( mw.text.trim( arg ), args );
end

function copyArgsToSnaks( args, snaks )
	if ( not isEmpty( args.part ) ) then snaks.P958 = { toStringSnak( 'P958', tostring( args.part ) ) } end
	if ( not isEmpty( args.pages ) ) then snaks.P304 = { toStringSnak( 'P304', tostring( args.pages ) ) } end
	if ( not isEmpty( args.issue ) ) then snaks.P433 = { toStringSnak( 'P433', tostring( args.issue ) ) } end
	if ( not isEmpty( args.volume ) ) then snaks.P478 = { toStringSnak( 'P478', tostring( args.volume ) ) } end
	if ( not isEmpty( args.url ) ) then snaks.P953 = { toUrlSnak( 'P953', tostring( args.url ) ) } end
end

function p.renderSourceImpl( entityId, args )
	args = args or {};

	local snaks = {};
	snaks.P248 = { toWikibaseEntityIdSnak( 'P248', entityId ) };
	copyArgsToSnaks( args, snaks );

	local rendered = renderReferenceImpl( mw.wikibase.getEntity(), { snaks = snaks }, args.refAnchor, args.refAnchorYear );
	if ( rendered ) then return rendered.text end;
end

function p.renderReference( frame, currentEntity, reference )
	p.currentFrame = frame;

	-- template call
	if ( frame and not currentEntity and not reference ) then
		local args = frame.args;
		if ( #frame.args == 0 ) then
			args = frame:getParent().args;
		end

		local snaks = {};

		if ( args[1] ) then
			snaks.P248 = { toWikibaseEntityIdSnak( "P248", args[1] ) };
		end
		copyArgsToSnaks( args, snaks );

		currentEntity = mw.wikibase.getEntity();
		reference = { snaks = snaks };
	end

	local rendered = renderReferenceImpl( currentEntity, reference );

	if ( not rendered ) then
		return '';
	end

	local result;
	local code = rendered.code or mw.text.encode( rendered.text );
	result = frame:extensionTag( 'ref', rendered.text, {name = code} ) .. '[[К:Википедия:Статьи с источниками из Викиданных]]';

	return result;
end

function renderReferenceImpl( currentEntity, reference, refAnchor, refAnchorYear )
	if ( not reference.snaks ) then
		return nil;
	end

	-- контекст, содержит также кеш элементов
	local context = {
		cache = {},
	}

	-- данные в простом формате, согласованном с модулями формирования библиографического описания
	local data = {};

	local entityId, sourceEntity;
	if ( reference and reference.snaks and reference.snaks.P248 ) then
		for _, snak in pairs ( reference.snaks.P248 ) do
			if ( snak.datavalue ) then
				entityId = 'Q' .. snak.datavalue.value["numeric-id"];
				sourceEntity = getEntity( context, entityId );
				data.code = entityId;
				data.entityId = entityId;
				break;
			end
		end
	end

	updateWithRef( reference, data );
	-- update ref name with ref-specific properties
	if ( data.code ) then
		if ( data.part ) then data.code = data.code .. '-' .. getSingle( data.part ) end
		if ( data.pages ) then data.code = data.code .. '-' .. getSingle( data.pages ) end
		if ( data.volume ) then data.code = data.code .. '-' .. getSingle( data.volume ) end
		if ( data.issue ) then data.code = data.code .. '-' .. getSingle( data.issue ) end
		if ( data.url ) then data.code = data.code .. '-' .. getSingle( data.url ) end
	end

	expandSpecials( currentEntity, reference, data );
	if ( sourceEntity ) then
		populateSourceDataImpl( sourceEntity, data );
	end
	
	if ( not data.publication and data.described ) then
		expandDescribed( context, sourceEntity, data );
	else
		if ( data.publication ) then expandPublication( context, sourceEntity, data ); end
	end

	if ( next( data ) == nil ) then
		return nil;
	end

	local rendered;
	if ( p.short ) then
		rendered = renderShortReference( data );
		if ( mw.ustring.len( rendered.text ) == 0 ) then
			return nil;
		end

	else
		rendered = renderSource( context, data );
		if ( mw.ustring.len( rendered.text ) == 0 ) then
			return nil;
		end

		if ( refAnchor ) then
			local anchorValue = 'CITEREF' .. refAnchor .. ( coalesce( refAnchorYear, data.year ) or '' );
			rendered.text = '<span class="citation" id="' .. mw.uri.anchorEncode( anchorValue ) .. '">' .. rendered.text .. '</span>';
		end
	end

	return rendered;
end

function getNormativeTitle( entity )
	if ( not entity or not entity.claims or not entity.claims.P31 ) then
		return;
	end

	for _, claim in pairs( entity.claims.P31 ) do
		if ( claim and claim.mainsnak and claim.mainsnak.datavalue and claim.mainsnak.datavalue.value and claim.mainsnak.datavalue.value["numeric-id"] ) then
			local classId = 'Q' .. claim.mainsnak.datavalue.value["numeric-id"];
			local title = NORMATIVE_DOCUMENTS[ classId ];
			if ( title ) then
				return title;
			end
		end
	end

	return;
end

local LANG_CACHE = 	{
	Q150	= 'fr',
	Q188	= 'de',
	Q1321	= 'es',
	Q1860	= 'en',
	Q652	= 'it',
	Q7737	= 'ru',
}

function getLangCode( langEntityId )
	if ( not langEntityId ) then
		return;
	end

	-- small optimization
	local cached = LANG_CACHE[ langEntityId ];
	if ( cached ) then return cached; end

	local langEntity = mw.wikibase.getEntity( langEntityId );
	if ( not langEntity ) then
		mw.log( '[getLangCode] Missing entity ' .. langEntityId );
	else
		if ( langEntity.claims and langEntity.claims.P424 ) then
			for _, claim in pairs( langEntity.claims.P424 ) do
				if ( claim
						and claim.mainsnak
						and claim.mainsnak.datavalue
						and claim.mainsnak.datavalue.value ) then
					return '' .. claim.mainsnak.datavalue.value;
				end
			end
		end
	end

	return;
end

function preprocessPlaces( data, lang )
	if ( not data.place ) then
		return;
	end;

	local newPlaces = {};
	for index, place in pairs( data.place ) do
		if ( place.id ) then
			local newPlaceStr = getPlaceName(lang, place.id)
			if ( newPlaceStr ) then
				newPlaces[index] = newPlaceStr;
			else
				newPlaces[index] = place;
			end
		else
			newPlaces[index] = place;
		end
	end
	data.place = newPlaces;
end

function getPlaceName( lang, placeId )
	-- ГОСТ Р 7.0.12—2011
	if ( lang == 'ru' ) then
		if ( placeId == 'Q649' ) then return toTextWithTip('М.', 'Москва'); end
		if ( placeId == 'Q656' ) then return toTextWithTip('СПб.', 'Санкт-Петербург'); end
		if ( placeId == 'Q891' ) then return toTextWithTip('Н. Новгород', 'Нижний Новгород'); end
		if ( placeId == 'Q908' ) then return toTextWithTip('Ростов н/Д.', 'Ростов-на-Дону'); end
	end
	return nil;
end

function toTextWithTip( text, tip )
	return '<span title="' .. tip .. '" style="border-bottom: 1px dotted; cursor: help; white-space: nowrap">' .. text .. '</span>';
end

return p;