Module:TemplateDataDoc

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Usage

This module automatically generates blocks of template documentation page using TemplateData.

• {{#invoke:TemplateDataDoc|generateBlank}} — generates blank template wikitext
• {{#invoke:TemplateDataDoc|generateExample}} — generates template example wikitext and shows how a template with such parameters will be displayed

For correct order of parameters, TemplateData should contain paramOrder block.

---

local docSubPage = mw.message.new( 'Templatedata-doc-subpage' ):plain();

local p = {};

function p.processJson( json )
	local status, data = pcall( mw.text.jsonDecode, json );
	if status == false then
		return nil;
	end

	if not data[ 'paramOrder' ] then
		data[ 'paramOrder' ] = {};
		for paramName, paramData in pairs( data[ 'params' ] ) do
			table.insert( data[ 'paramOrder' ], paramName );
		end
	end
	
	local deprecatedParams = {
		'nocat',
		'nocoord',
		'nocatcoord',
	};
	for _, param in ipairs( deprecatedParams ) do
		if data[ 'params' ][ param ] ~= nil then
			data[ 'params' ][ param ][ 'deprecated' ] = '-';
		end
	end

	return data;
end

function p.getTemplateData( pageName )
	local title = mw.title.makeTitle( 0, pageName );
	if not title or not title.exists or not title:getContent() then
		return nil;
	end;

	local json = mw.ustring.match( title:getContent(), '<templatedata%s*>(.*)</templatedata%s*>' );
	if not json then
		return nil;
	end
	
	return p.processJson( json )
end

-- See https://phabricator.wikimedia.org/diffusion/ETDA/browse/master/Specification.md?as=remarkup
-- We need a global format value for the 'block' and 'inline': [[phab:T205438]]
function p.convertFormatString( rawTemplateFormat )
	local templateFormat = rawTemplateFormat;
	local isBlockFormatted = false;
	if templateFormat == 'block' then
		templateFormat = '{{_\n| _ = _\n}}';
		isBlockFormatted = true;
	elseif templateFormat == 'inline' then
		templateFormat = '{{_|_=_}}';
	end
	
	return templateFormat, isBlockFormatted;
end

function p.getFormatParts( rawTemplateFormat, templateName )
	local templateFormat, isBlockFormatted = p.convertFormatString( rawTemplateFormat );
	local nameFormat = mw.ustring.match( templateFormat, '^[^|]+' );
	local paramKeyFormat = mw.ustring.match( templateFormat, '%|[^=]+=' );
	local paramValueFormat = mw.ustring.match( templateFormat, '=[^}]+' );
	paramValueFormat = mw.ustring.sub( paramValueFormat, 2 );
	local endFormat = mw.ustring.match( templateFormat, '%}%}.*$' );
	local startFormat = mw.ustring.gsub( nameFormat, '_', templateName );
	
	return isBlockFormatted, startFormat, endFormat, paramKeyFormat, paramValueFormat;
end

function p.generateBlankCode( templateData, templateName, args )
	local paramaterLength = 0;
	for i, parameterName in ipairs( templateData[ 'paramOrder' ] ) do
		local parameterData = templateData[ 'params' ][ parameterName ] or {};
		if not parameterData[ 'deprecated' ] then
			local length = mw.ustring.len( parameterName );
			if length > paramaterLength then
				paramaterLength = length;
			end
		end
	end

	local isBlockFormatted, startFormat, endFormat, paramKeyFormat, paramValueFormat = p.getFormatParts( templateData[ 'format' ], templateName );
	local out = startFormat;

	local lastNumber = 0;
	for i, parameterName in ipairs( templateData[ 'paramOrder' ] ) do
		local parameterData = templateData[ 'params' ][ parameterName ] or {};
		if parameterData[ 'inherits' ] then
			parameterData = templateData[ 'params' ][ parameterData[ 'inherits' ] ] or {};
		end
		
		if not parameterData[ 'deprecated' ] then
			local key = parameterName;
			local nkey = tonumber(key);
			if isBlockFormatted then
				if nkey == nil or lastNumber ~= nkey - 1 then
					while mw.ustring.len( key ) < paramaterLength do
						key = key .. ' ';
					end
				end
			end
			
			if nkey ~= nil and lastNumber == nkey - 1 then
				key = '';
				lastNumber = nkey;
			end
	
			local value = '';
			if args[ 'description' ] == '1' and parameterData[ 'description' ] then
				value = parameterData[ 'description' ];
				if value ~= '' then
					value = '&lt;!-- ' .. value .. ' --&gt;';
				end
			elseif parameterData[ 'autovalue' ] then
				value = parameterData[ 'autovalue' ];
			end
			if args[ '$' .. parameterName ] and args[ '$' .. parameterName ] ~= '' then
				value = args[ '$' .. parameterName ];
			end
	
			local formattedKey = mw.ustring.gsub( paramKeyFormat, '_+', key, 1 );
			if key == '' then
				formattedKey = mw.ustring.gsub( formattedKey, '=', '' );
			end
			out = out .. formattedKey;

			out = out .. mw.ustring.gsub( paramValueFormat, '_', value, 1 );
		end
	end
	
	return out .. endFormat;
end

function p.generateBlank( frame )
	local frame = mw.getCurrentFrame();
	local getArgs = require( 'Module:Arguments' ).getArgs;
	local args = getArgs( frame );
	local templateName = frame.args[ 1 ];
	table.remove( args, 1 );
	
	local docPage = 'Template:' .. templateName .. '/' .. docSubPage;
	local templateData = p.getTemplateData( docPage );
	local out = p.generateBlankCode( templateData, templateName, args );

	return frame:extensionTag{ name = 'pre', content = out };
end

function p.generateExampleCode( templateData, templateName, args )
	local paramaterLength = 0;
	for i, parameterName in ipairs( templateData[ 'paramOrder' ] ) do
		local parameterData = templateData[ 'params' ][ parameterName ] or {};
		if parameterData[ 'example' ] and not parameterData[ 'deprecated' ] then
			local length = mw.ustring.len( parameterName );
			if length > paramaterLength then
				paramaterLength = length;
			end
		end
	end

	local isBlockFormatted, startFormat, endFormat, paramKeyFormat, paramValueFormat = p.getFormatParts( templateData[ 'format' ], templateName );
	local out = startFormat;

	local lastNumber = 0;
	for i, parameterName in ipairs( templateData[ 'paramOrder' ] ) do
		local parameterData = templateData[ 'params' ][ parameterName ] or {};
		if parameterData[ 'inherits' ] then
			parameterData = templateData[ 'params' ][ parameterData[ 'inherits' ] ] or {};
		end
		
		if parameterData[ 'example' ] and not parameterData[ 'deprecated' ] then
			local key = parameterName;
			local nkey = tonumber( key );
			if isBlockFormatted then
				if nkey == nil or lastNumber ~= nkey - 1 then
					while mw.ustring.len( key ) < paramaterLength do
						key = key .. ' ';
					end
				end
			end
			
			if nkey ~= nil and lastNumber == nkey - 1 then
				key = '';
				lastNumber = nkey;
			end

			local value = parameterData[ 'example' ];

			local formattedKey = mw.ustring.gsub( paramKeyFormat, '_+', key, 1 );
			if key == '' then
				formattedKey = mw.ustring.gsub( formattedKey, '=', '' );
			end
			out = out .. formattedKey;

			out = out .. mw.ustring.gsub( paramValueFormat, '_', value, 1 );
		end
	end
	
	return out .. endFormat;
end	

function p.generateExample( frame )
	local frame = mw.getCurrentFrame();
	local args = frame.args;
	local templateName = frame.args[ 1 ];
	local docPage = 'Template:' .. templateName .. '/' .. docSubPage;
	local templateData = p.getTemplateData( docPage );
	local out = p.generateExampleCode( templateData, templateName, args );	
	
	return frame:preprocess( out ) .. frame:extensionTag{ name = 'pre', content = out };
end

return p;