Module:Transcluder

local p = {}

-- Helper function to test for truthy and falsy values local function is(value) if not value or value == '' or value == 0 or value == '0' or value == 'false' or value == 'no' then return false end return true end

-- Helper function to match from a list regular expressions -- Like so: match pre..list[1]..post or pre..list[2]..post or ... local function matchAny(text, pre, list, post, init) local match = {} for i = 1, #list do match = { mw.ustring.match(text, pre .. list[i] .. post, init) } if match[1] then return unpack(match) end end return nil end

-- Helper function to convert a comma-separated list of numbers or min-max ranges into a list of booleans -- For example: '1,3-5' to {1=true,2=false,3=true,4=true,5=true} local function numberFlags(flags) if not flags then return end local ranges = mw.text.split(flags, ',') -- parse ranges: '1,3-5' to {'1','3-5'} local flags = {} for _, range in pairs(ranges) do		local min, max = mw.ustring.match(range, '^%s*(%d+)%s*%-%s*(%d+)%s*$') -- '3-5' to min=3 max=5 if not max then	min, max = mw.ustring.match(range, '^%s*((%d+))%s*$') end -- '1' to min=1 max=1 if max then for p = min, max do flags[p] = true end end end return flags end

-- Helper function to convert template arguments into an array of options fit for get local function parseArgs(frame) local args = {} for key, value in pairs(frame:getParent.args) do args[key] = value end for key, value in pairs(frame.args) do args[key] = value end -- args from Lua calls have priority over parent args from template return args end

-- Error handling function -- Throws a Lua error or returns an empty string if error reporting is disabled local function throwError(message, value) message = require('Module:TNT').format('I18n/Excerpt', 'error-' .. message, value) error(message, 2) end

-- Error handling function -- Returns a wiki friendly error or an empty string if error reporting is disabled local function getError(message, value) message = d.errors[message] or message or '' message = mw.ustring.format(message, value) message = d.errors.prefix .. message if mw.title.getCurrentTitle.isContentPage then local errorsCategory = mw.title.new(d.errorsCategory, 'Category') if errorsCategory then message = message ..  .. errorsCategory.prefixedText ..  end end message = mw.html.create('div'):addClass('error'):wikitext(message) return message end

-- Get the page wikitext, following redirects -- Also returns the page name, or the target page name if a redirect was followed, or false if no page was found -- For file pages, returns the content of the file description page local function getText(page) local title = mw.title.new(page) if not title then return false, false end

local target = title.redirectTarget if target then title = target end

return title:getContent, title.prefixedText end

-- Get the requested paragraphs out of the given wikitext. -- @param text Required. Wikitext to parse. -- @param flags Range of paragraphs to return, for example 2 or '1,3-5'. Omit to return all paragraphs. -- @return Sequence of strings containing the wikitext of the requested paragraphs. local function getParagraphs(text, flags) local paragraphs = {}

flags = numberFlags(flags)

text = '\n' .. text .. '\n' -- add newlines to match paragraphs at the start and end of text

-- Remove tables and block templates such as infoboxes for template in mw.ustring.gmatch(text, '\n%b{}\n') do		text = mw.ustring.gsub(text, template, '\n') end

-- Remove files local fileNamespaces = mw.site.namespaces.File.aliases table.insert(fileNamespaces, mw.site.namespaces.File.name) table.insert(fileNamespaces, mw.site.namespaces.File.canonicalName) for link in mw.ustring.gmatch(text, '%b[]') do		if matchAny(link, '%[%[%s*', fileNamespaces, '%s*:.*%]%]') then link = mw.ustring.gsub(link, '([%^%$%(%)%%%.%[%]%*%+%-%?])', '%%%1') text = mw.ustring.gsub(text, link, '\n') end end

-- Assume that each remaining line is a paragraph local count = 0 for paragraph in mw.ustring.gmatch(text, '[^\n]+') do		count = count + 1 if flags then if flags[count] then table.insert(paragraphs, paragraph) end else table.insert(paragraphs, paragraph) end end

return paragraphs end

-- Get the requested files out of the given wikitext. -- @param text Required. Wikitext to parse. -- @param flags Range of files to return, for example 2 or '1,3-5'. Omit to return all files. -- @return Sequence of strings containing the wikitext of the requested files. local function getFiles(text, flags) local files = {}

flags = numberFlags(flags)

local fileNamespaces = mw.site.namespaces.File.aliases table.insert(fileNamespaces, mw.site.namespaces.File.name) table.insert(fileNamespaces, mw.site.namespaces.File.canonicalName)

local count = 0 for link in mw.ustring.gmatch(text, '%b[]') do		if matchAny(link, '%[%[%s*', fileNamespaces, '%s*:.*%]%]') then count = count + 1 if flags then if flags[count] then table.insert(files, link) end else table.insert(files, link) end end end

return files end

-- Get the requested tables out of the given wikitext. -- @param text Required. Wikitext to parse. -- @param flags Range of tables to return, for example 2 or '1,3-5'. Omit to return all tables. -- @return Sequence of strings containing the wikitext of the requested tables. local function getTables(text, flags) local tables = {}

flags = numberFlags(flags)

local count = 0 for t in mw.ustring.gmatch(text, '%b{}') do		if mw.ustring.sub(t, 1, 2) == '{|' then count = count + 1 if flags then if flags[count] then table.insert(tables, t) end else table.insert(tables, t)			end end end

return tables end

-- Get the requested lists out of the given wikitext. -- @param text Required. Wikitext to parse. -- @param flags Range of lists to return, for example 2 or '1,3-5'. Omit to return all lists. -- @return Sequence of strings containing the wikitext of the requested lists. local function getLists(text, flags) local lists = {}

flags = numberFlags(flags)

text = '\n' .. text .. '\n@' -- add newlines and @ to match lists at the start and end of text

local count = 0 for list in mw.ustring.gmatch(text, '\n([*#].-)\n[^*#]') do		count = count + 1 if flags then if flags[count] then table.insert(lists, list) end else table.insert(lists, list) end end

return lists end

-- Get the lead section out of the given wikitext. -- @param text Required. Wikitext to parse. -- @return Wikitext of the lead section. local function getLead(text) text = mw.ustring.gsub(text, '\n==.*', '') text = mw.text.trim(text) if not text then return throwError('lead-empty') end return text end

-- Get the requested section out of the given wikitext (including subsections). -- @param text Required. Wikitext to parse. -- @param section Required. Title of the section to get (in wikitext), for example 'History' or 'History of Athens'. -- @return Wikitext of the requested section. local function getSection(text, section) text = '\n' .. text .. '\n' -- add newlines to match sections at the start and end of text local escapedSection = mw.ustring.gsub(mw.uri.decode(section), '([%^%$%(%)%%%.%[%]%*%+%-%?])', '%%%1') local level, text = mw.ustring.match(text, '\n(==+)%s*' .. escapedSection .. '%s*==.-\n(.*)') if not text then return throwError('section-not-found', section) end local nextSection = '\n==' .. mw.ustring.rep('=?', #level - 2) .. '[^=].*'	text = mw.ustring.gsub(text, nextSection, '') -- remove later sections with headings at this level or higher text = mw.text.trim(text) if text == '' then return throwError('section-empty', section) end return text end

-- Get the wikitext between  and  tags. -- @param text Required. Wikitext to parse. -- @param fragment Required. Name of the fragment to get. -- @return Wikitext of the requested fragment. -- @todo Implement custom parsing of fragments rather than relying on #lst. local function getFragment(text, fragment) local escapedFragment = mw.ustring.gsub(fragment, '[%^%$%(%)%%%.%[%]%*%+%-%?]', '%%%0') local found local fragments = '' for f in mw.ustring.gmatch(text, '<%s*[Ss]ection%s+begin%s*=%s*[\"\']?%s*' .. escapedFragment .. '%s*[\"\']?%s*/>(.-)<%s*[Ss]ection%s+end=%s*[\"\']?%s*' .. escapedFragment .. '%s*[\"\']?%s*/>') do		found = true fragments = fragments .. f	end if not found then return throwError('fragment-not-found', fragment) end fragments = mw.text.trim(fragments) if fragments == '' then return throwError('fragment-empty', fragment) end return fragments end

-- Remove elements that most certainly we don't want transcluded. -- @param text Required. Wikitext to clean. -- @return Clean wikitext. local function cleanText(text)

-- Remove HTML comments text = mw.ustring.gsub(text, '<!%-%-.-%-%->','')

-- Remove tags text = mw.ustring.gsub(text, '.-', '') -- remove noinclude bits

-- Keep tags if mw.ustring.find(text, '[Oo][Nn][Ll][Yy][Ii][Nn][Cc][Ll][Uu][Dd][Ee]') then -- avoid expensive search if possible text = mw.ustring.gsub(text, '.-', '') -- remove text between onlyinclude sections text = mw.ustring.gsub(text, '^.-', '') -- remove text before first onlyinclude section text = mw.ustring.gsub(text, '.*', '') -- remove text after last onlyinclude section end

-- Remove magic words text = mw.ustring.gsub(text, '%s*__[A-Z]*__', '')

-- Remove categories local categoryNamespace = mw.site.namespaces.Category.aliases table.insert(categoryNamespace, mw.site.namespaces.Category.name) table.insert(categoryNamespace, mw.site.namespaces.Category.canonicalName) for link in mw.ustring.gmatch(text, '%b[]') do		if matchAny(link, '%[%[%s*', categoryNamespace, '%s*:.*%]%]') then link = mw.ustring.gsub(link, '([%^%$%(%)%%%.%[%]%*%+%-%?])', '%%%1') text = mw.ustring.gsub(text, link, '') end end

return text end

-- Replace the first call to each reference defined outside of the text for the full reference, to prevent undefined references -- Then prefix the page title to the reference names to prevent conflicts -- that is, replace  for  -- and also for -- also remove reference groups:  for  -- and  for -- @todo The current regex may fail in cases with both kinds of quotes, like  local function fixRefs(text, page, full) if not full then full = getText(page) end local refNames = {} local refName local refBody local position = 1 while position < mw.ustring.len(text) do		refName, position = mw.ustring.match(text, "<%s*[Rr][Ee][Ff][^>]*name%s*=%s*[\"']?([^\"'>]+)[\"']?[^>]*/%s*>", position)		if refName then			refName = mw.text.trim(refName)			if not refNames[refName] then -- make sure we process each ref name only once				table.insert(refNames, refName)				refName = mw.ustring.gsub(refName, "[%^%$%(%)%.%[%]%*%+%-%?%%]", "%%%0") -- escape special characters				refBody = mw.ustring.match(text, "<%s*[Rr][Ee][Ff][^>]*name%s*=%s*[\"']?%s*" .. refName .. "%s*[\"']?[^>/]*>.-<%s*/%s*[Rr][Ee][Ff]%s*>")				if not refBody then -- the ref body is not in the excerpt					refBody = mw.ustring.match(full, "<%s*[Rr][Ee][Ff][^>]*name%s*=%s*[\"']?%s*" .. refName .. "%s*[\"']?[^/>]*>.-<%s*/%s*[Rr][Ee][Ff]%s*>")					if refBody then -- the ref body was found elsewhere						text = mw.ustring.gsub(text, "<%s*[Rr][Ee][Ff][^>]*name%s*=%s*[\"']?%s*" .. refName .. "%s*[\"']?[^>]*/?%s*>", refBody, 1)					end				end			end		else			position = mw.ustring.len(text)		end	end	text = mw.ustring.gsub(text, "<%s*[Rr][Ee][Ff][^>]*name%s*=%s*[\"']?([^\"'>/]+)[\"']?[^>/]*(/?)%s*>", '')	text = mw.ustring.gsub(text, "<%s*[Rr][Ee][Ff][^>]*group%s*=%s*[\"']?[^\"'>/]+[\"']%s*>", ' ')	return text end

-- Replace the bold title or synonym near the start of the article by a wikilink to the article function linkBold(text, page) local lang = mw.language.getContentLanguage local position = mw.ustring.find(text, "" .. lang:ucfirst(page) .. "", 1, true) -- look for "Foo is..." (uc) or "A foo is..." (lc) or mw.ustring.find(text, "" .. lang:lcfirst(page) .. "", 1, true) -- plain search: special characters in page represent themselves if position then local length = mw.ustring.len(page) text = mw.ustring.sub(text, 1, position + 2) .. "" .. mw.ustring.sub(text, position + 3, position + length + 2) .. "" .. mw.ustring.sub(text, position + length + 3, -1) -- link it else -- look for anything unlinked in bold, assumed to be a synonym of the title (e.g. a person's birth name) text = mw.ustring.gsub(text, "(.-'*)", function(a, b)			if not mw.ustring.find(b, "%[") then -- if not wikilinked				return "" .. b .. "" -- replace Foo by Foo			else				return nil -- instruct gsub to make no change			end		 end, 1) -- "end" here terminates the anonymous replacement function(a, b) passed to gsub end return text end

-- Main function for modules local function get(page, options) if not page or page == '' then return throwError('no-page') end local page, section = mw.ustring.match(page, '([^#]+)#?([^#]*)') local text, page = getText(page) if not page then return throwError('no-page') end if not text then return throwError('page-not-found', page) end local full = text -- save the full text for fixRefs below

if not options then options = {} end

-- Get the requested lead section or section if is(options.fragment) then text = getFragment(text, options.fragment) elseif is(section) then text = getSection(text, section) if not is(options.subsections) then text = getLead(text) end else text = getLead(text) end

-- Keep only the requested elements if options.only == 'lists' or options.only == 'list' then local lists = getLists(text, options.lists) text = table.concat(lists, '\n\n') elseif options.only == 'files' or options.only == 'file' then local files = getFiles(text, options.files) text = table.concat(files, '\n\n') elseif options.only == 'tables' or options.only == 'table' then local tables = getTables(text, options.tables) text = table.concat(tables, '\n\n') elseif options.only == 'paragraphs' or options.only == 'paragraph' then local paragraphs = getParagraphs(text, options.paragraphs) text = table.concat(paragraphs, '\n\n') end

-- Misc options if is(options.noRefs) then text = mw.ustring.gsub(text, "<%s*[Rr][Ee][Ff].->.-<%s*/%s*[Rr][Ee][Ff]%s*>", "") -- remove refs text = mw.ustring.gsub(text, "<%s*[Rr][Ee][Ff][^>]-/%s*>", "") -- remove citations elseif is(options.fixRefs) then text = fixRefs(text, page, full) end if is(options.linkBold) then linkBold(text, page) end if is(options.noBold) then text = mw.ustring.gsub(text, "'", ) end

return text end

-- Main invocation function for templates local function main(frame) local args = parseArgs(frame) local page = args[1] local ok, text = pcall(get, page, args) if not ok then return getError(text) end return frame:preprocess(text) end

-- Entry points for templates function p.main(frame) return main(frame) end

-- Entry points for other Lua modules function p.get(page, options) return get(page, options) end function p.getText(page) return getText(page) end function p.getLead(text) return getLead(text) end function p.getSection(text, section) return getSection(text, section) end function p.getFragment(text, fragment) return getFragment(text, fragment) end function p.getParagraphs(text, flags) return getParagraphs(text, flags) end function p.getTables(text, flags) return getTables(text, flags) end function p.getLists(text, flags) return getLists(text, flags) end function p.getFiles(text, flags) return getFiles(text, flags) end function p.getError(message, value) return getError(message, value) end

return p