Module:Excerpt/portals

-- ATTENTION ! -- This version of Excerpt is designed specifically for the portal namespace and its associated templates -- Prefer Module:Excerpt whenever possible

-- Name of the category to track content pages with errors local errorCategory = "Articles with broken excerpts"

-- Error messages local errorMessages = { prefix = "Excerpt error: ", noPage = "No page given", pageNotFound = "Page '%s' not found", leadEmpty = "Lead section is empty", sectionEmpty = "Section '%s' is empty", sectionNotFound = "Section '%s' not found", fragmentEmpty = "Fragment '%s' is empty", fragmentNotFound = "Fragment '%s' not found" }

-- Regular expressions to match all aliases of the file namespace local fileNamespaces = { "[Ff]ile", "[Ii]mage" }

-- Regular expressions to match all image parameters local imageParams = { {"thumb", "thumbnail", "frame", "framed", "frameless"}, {"right", "left", "center", "centre", "none"}, {"baseline", "middle", "sub", "super", "text-top", "text-bottom", "top", "bottom"} }

-- Regular expressions to match all infobox parameters for image captions local captionParams = { "[^=|]*[Cc]aption[^=|]*", "[^=|]*[Ll]egend[^=|]*" }

-- List of file types that are allowed to be transcluded local fileTypes = {"[Gg][Ii][Ff]", "[Jj][Pp][Ee]?[Gg]", "[Pp][Nn][Gg]", "[Ss][Vv][Gg]", "[Tt][Ii][Ff][Ff]", "[Xx][Cc][Ff]"}

-- Regular expressions to match all inline templates that are undesirable in excerpts local unwantedInlineTemplates = { "[Ee]fn", "[Ee]fn%-[lu][arg]", "[Ee]fn [%a ]-", "[Ee]l[mn]", "[Rr]p?", "[Ss]fn[bmp]", "[Ss]f[bn]", "[Nn]ote[Tt]ag", "#[Tt]ag:%s*[Rr]ef", "[Rr]efn?", "[CcDd]n", "[Cc]itation[%- _]needed", "[Dd]isambiguation needed", "[Ff]eatured article", "[Gg]ood article", "[Dd]ISPLAYTITLE", "[Ss]hort[ _]+description", "[Cc]itation", "[Cc]ite[%- _]+[%w_%s]-", "[Cc]oor[%w_%s]-", "[Uu]?n?[Rr]eliable source[%?%w_%s]-", "[Rr]s%??", "[Vv]c", "[Vv]erify credibility", "[Bb]y[ _]*[Ww]ho[m]*%??", "[Ww]ikisource[ -_]*multi", "[Ii]nflation[ _/-]*[Ff]n", "[Bb]iblesource", "[Dd]ecadebox", "[Ee]vents by year for decade", -- aliases for Clarification needed "[Cc]f[ny]", "[Cc]larification[ _]+inline", "[Cc]larification[%- _]*needed", "[Cc]larification", "[Cc]larify%-inline", "[Cc]larify%-?me", "[Cc]larify[ _]+inline", "[Cc]larify", "[Cc]LARIFY", "[Cc]onfusing%-inline", "[Cc]onfusing%-short", "[Ee]xplainme", "[Hh]uh[ _]*%??", "[Ww]hat%?", "[Ii]nline[ _]+[Uu]nclear", "[Ii]n[ _]+what[ _]+sense", "[Oo]bscure", "[Pp]lease[ _]+clarify", "[Uu]nclear[ _]+inline", "[Ww]hat's[ _]+this%?", "[Gg]eoQuelle", "[Nn]eed[s]+[%- _]+[Ii][Pp][Aa]", "[Ii]PA needed", -- aliases for Clarification needed lead "[Cc]itation needed %(?lea?de?%)?", "[Cc]nl", "[Ff]act %(?lea?de?%)?", "[Ll]ead citation needed", "[Nn]ot in body", "[Nn]ot verified in body", -- Primary source etc.	"[Pp]s[ci]", "[Nn]psn", "[Nn]on%-primary[ _]+source[ _]+needed", "[Ss]elf%-published[%w_%s]-", "[Uu]ser%-generated[%w_%s]-", "[Pp]rimary source[%w_%s]-", "[Ss]econdary source[%w_%s]-", "[Tt]ertiary source[%w_%s]-", "[Tt]hird%-party[%w_%s]-", -- aliases for Disambiguation (page) and similar "[Bb]egriffsklärung", "[Dd][Aa][Bb]", "[Dd]big", "[%w_%s]-%f[%w][Dd]isam[%w_%s]-", "[Hh][Nn][Dd][Ii][Ss]", -- aliases for Failed verification "[Bb]adref", "[Ff]aile?[ds] ?[rv][%w_%s]-", "[Ff][Vv]", "[Nn][Ii]?[Cc][Gg]", "[Nn]ot ?in ?[crs][%w_%s]-", "[Nn]ot specifically in source", "[Vv]erification[%- _]failed", -- aliases for When "[Aa]s[ _]+of[ _]+when%??", "[Aa]s[ _%-]+of%??", "[Cc]larify date", "[Dd]ate[ _]*needed", "[Nn]eeds?[ _]+date", "[Rr]ecently", "[Ss]ince[ _]+when%??", "[Ww]HEN", "[Ww]hen%??", -- aliases for Update "[Nn]ot[ _]*up[ _]*to[ _]*date","[Oo]u?[Tt][Dd]","[Oo]ut[%- _]*o?f?[%- _]*dated?", "[Uu]pdate", "[Uu]pdate[ _]+sect", "[Uu]pdate[ _]+Watch", -- aliases for Pronunciation needed "[Pp]ronunciation%??[%- _]*n?e?e?d?e?d?", "[Pp]ronounce", "[Rr]equested[%- _]*pronunciation", "[Rr]e?q?pron", "[Nn]eeds[%- _]*pronunciation", -- Chart, including Chart/start etc.	"[Cc]hart", "[Cc]hart/[%w_%s]-", -- Cref and others "[Cc]ref2?", "[Cc]note", -- Explain and others "[Ee]xplain", "[Ff]urther[ ]*explanation[ ]*needed", "[Ee]laboration[ ]*needed", "[Ee]xplanation[ ]*needed", -- TOC templates "[Cc][Oo][Mm][Pp][Aa][Cc][Tt][ _]*[Tt][Oo][Cc][8]*[5]*", "[Tt][Oo][Cc]", "09[Aa][Zz]", "[Tt][Oo][Cc][ ]*[Cc][Oo][Mm][Pp][Aa][Cc][Tt]", "[Tt][Oo][Cc][ ]*[Ss][Mm][Aa][Ll][Ll]", "[Cc][Oo][Mm][Pp][Aa][Cc][Tt][ _]*[Aa][Ll][Pp][Hh][Aa][Bb][Ee][Tt][Ii][Cc][ _]*[Tt][Oo][Cc]", "DEFAULTSORT:.-", "[Oo]ne[ _]+source", "[Cc]ontains[ _]+special[ _]+characters", "[Ii]nfobox[ _]+[Cc]hinese" }

-- Regular expressions to match all block templates that are desirable in excerpts local wantedBlockTemplates = { "[Bb]asketball[ _]roster[ _]header", "[Cc]abinet[ _]table[^|}]*", "[Cc]hart[^|}]*", "[Cc]lear", "[Cc]ol[%- es][^|}]*", -- all abbreviated column templates without excessively matching (,, etc.) "[Cc]olumn[^|}]*", -- all other column templates "COVID-19[ _]pandemic[ _]data[^|}]*", "[Cc]ycling[ _]squad[^|}]*", "[Dd]ynamic[ _]list", "[Ee]lection[ _]box[^|}]*", "[Gg]allery", "[Gg]raph[^|}]*", "[Hh]idden", "[Hh]istorical[ _]populations", "[Ll]egend[ _]inline", "[Pp]lainlist", "[Pp]layer[^|}]*", "[Ss]eries[ _]overview", "[Ss]ide[ _]box", "[Ss]witcher", "[Tt]ree[ _]chart[^|}]*", "[Tt]elevision[ _]ratings[ _]graph" }

local Transcluder = require("Module:Transcluder") local escapeString = require("Module:String")._escapePattern local yesno = require('Module:Yesno') 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 == "false" or value == "no" then return false end return true end

-- Error handling function -- Throws a Lua error or returns an empty string if error reporting is disabled local errors = true -- show errors by default local function luaError(message, value) if not is(errors) then return '' end -- error reporting is disabled message = errorMessages[message] or message or '' message = mw.ustring.format(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 wikiError(message, value) if not is(errors) then return '' end -- error reporting is disabled message = errorMessages[message] or message or '' message = mw.ustring.format(message, value) message = errorMessages.prefix .. message if mw.title.getCurrentTitle.isContentPage then local errorCategory = mw.title.new(errorCategory, 'Category') if errorCategory then message = message ..  .. errorCategory.prefixedText ..  end end message = mw.html.create('div'):addClass('error'):wikitext(message) return message 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 imagemaps into standard images local function convertImageMap(imagemap) local image = matchAny(imagemap, "[>\n]%s*", fileNamespaces, "[^\n]*") if image then return "" .. mw.ustring.gsub(image, "[>\n]%s*", "", 1) .. "" else return "" -- remove entire block if image can't be extracted end 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(str) if not str then return {} end local flags = {} local ranges = mw.text.split(str, ",") -- parse ranges: "1,3-5" to {"1","3-5"} for _, r in pairs(ranges) do		local min, max = mw.ustring.match(r, "^%s*(%d+)%s*[-–—]%s*(%d+)%s*$") -- "3-5" to min=3 max=5 if not max then	min, max = mw.ustring.match(r, "^%s*((%d+))%s*$") 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 arguments 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 a Lua call have priority over parent args from template args.paraflags = numberFlags(args["paragraphs"] or "") -- parse paragraphs: "1,3-5" to {"1","3-5"} args.fileflags = numberFlags(args["files"] or "") -- parse file numbers return args end

-- simulate without the footnote, given "N|485US|," or similar local function airreg(p) local s = mw.text.split(p, "%s*|%s*") if s[1] ~= "N" and s[1] ~= "HL" and s[1] ~= "JA" then s[1]=s[1] .. "-" end return table.concat(s, "") end

-- Helper function to remove unwanted templates and pseudo-templates such as #tag:ref and DEFAULTSORT local function stripTemplate(t) -- If template is unwanted then return "" (gsub will replace by nothing), else return nil (gsub will keep existing string) if matchAny(t, "^{{%s*", unwantedInlineTemplates, "%s*%f[|}]") then return "" end

-- If template is wanted but produces an unwanted reference then return the string with |Note=, |ref or |shortref removed local noRef = mw.ustring.gsub(t, "|%s*Note%s*=.-%f[|}]", "") noRef = mw.ustring.gsub(noRef, "|%s*ref%s*%f[|}]", "") noRef = mw.ustring.gsub(noRef, "|%s*shortref%s*%f[|}]", "")

-- If a wanted template has unwanted nested templates, purge them too noRef = mw.ustring.sub(noRef, 1, 2) .. mw.ustring.gsub(mw.ustring.sub(noRef, 3), "%b{}", stripTemplate)

-- Replace by its text parameter:  → Bar noRef = mw.ustring.gsub(noRef, "^{{%s*[Aa]udio.-|.-|(.-)%f[|}].*", "%1")

-- Replace by its text parameter: English (英語) → English noRef = mw.ustring.gsub(noRef, "^{{%s*[Nn]ihongo[ _]+foot%s*|(.-)%f[|}].*", "%1")

-- Replace by its text parameter:  → N485US, noRef = mw.ustring.gsub(noRef, "^", airreg)

if noRef ~= t then return noRef end

return nil -- not an unwanted template: keep end

-- Get a page's content, following redirects -- Also returns the page name, or the target page name if a redirect was followed, or false if no page found -- For file pages, returns the content of the file description page local function getContent(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 tables only local function getTables(text, options) local tables = {} for candidate in mw.ustring.gmatch(text, "%b{}") do		if mw.ustring.sub(candidate, 1, 2) == '{|' then table.insert(tables, candidate) end end return table.concat(tables, '\n') end

-- Get the lists only local function getLists(text, options) local lists = {} for list in mw.ustring.gmatch(text, "\n[*#][^\n]+") do		table.insert(lists, list) end return table.concat(lists, '\n') end

-- Check image for suitability local function checkImage(image) if type(image) == "table" then --Infobox image. Pass in a quick string equivilant of the image, since we should still check it for things like non-free files return checkImage("") end local page = matchAny(image, "", fileNamespaces, "%s*:[^|%]]*") -- match File:(name) or Image:(name) if not page then return false end

-- Limit to image types: .gif, .jpg, .jpeg, .png, .svg, .tiff, .xcf (exclude .ogg, audio, etc.) if not matchAny(page, "%.", fileTypes, "%s*$") then return false end

-- Check the local wiki local fileDescription, fileTitle = getContent(page) -- get file description and title after following any redirect if not fileTitle or fileTitle == "" then return false end -- the image doesn't exist

-- Check Commons if not fileDescription or fileDescription == "" then local frame = mw.getCurrentFrame fileDescription = frame:preprocess("") end

-- Filter non-free images if not fileDescription or fileDescription == "" or mw.ustring.match(fileDescription, "[Nn]on%-free") then return false end

return true end

-- Attempt to parse or, either anywhere (start=false) or at the start only (start=true) local function parseImage(text, start) local startre = "" if start then startre = "^" end -- a true flag restricts search to start of string local image = matchAny(text, startre .. "%[%[%s*", fileNamespaces, "%s*:.*") -- [[File: or [[Image: ...	if image then		image = mw.ustring.match(image, "%b[]%s*") -- matching [[...]] to handle wikilinks nested in caption	end	return image end

-- Returns the file name and the arg data of the file if it exists local function extractFileData(str,notmultiline) local reg = "^%[?%[?%a-:([^{|]+)(.-)%]?%]?$" local name,args,_ = mw.ustring.match(str,reg) if name then return name,args else return str,"" --Default fallback end end

--Modifies an image's parameters, automatically fixing related parameters in the process local function modifyImage(image, fileArgs) if type(image) == "table" then --Pass in a dummy string version and use that to handle modification local newversion = modifyImage("",fileArgs) --Since we know the format is strictly controlled, we can do a lazy sub grab for the args image.args = string.sub(newversion,8+#image.file,-3) return image end if fileArgs then for _, filearg in pairs(mw.text.split(fileArgs, "|")) do -- handle fileArgs=left|border etc.			local fa = mw.ustring.gsub(filearg, "=.*", "") -- "upright=0.75" → "upright" local group = {fa} -- group of "border" is ["border"]... for _, g in pairs(imageParams) do				for _, a in pairs(g) do					if fa == a then group = g end -- ...but group of "left" is ["right", "left", "center", "centre", "none"] end end for _, a in pairs(group) do image = mw.ustring.gsub(image, "|%s*" .. a .. "%f[%A]%s*=[^|%]]*", "") -- remove "|upright=0.75" etc. image = mw.ustring.gsub(image, "|%s*" .. a .. "%s*([|%]])", "%1") -- replace "|left|" by "|" etc.			end image = mw.ustring.gsub(image, "([|%]])", "|" .. filearg .. "%1", 1) -- replace "|" by "|left|" etc.		end end image = mw.ustring.gsub(image, "(|%s*%d*x?%d+%s*px%s*.-)|%s*%d*x?%d+%s*px%s*([|%]])", "%1%2") -- double px args return image end

-- Turns a template's file table into a string local function formatTemplateImage(image,allowFancy) --Certain positional elements may need to apply to the containing infobox, and not the file itself, so we should check that here if is(image.caption) and allowFancy then --Will be displayed like an infobox local alignment = (string.find(image.args, "|left") and "left") or (string.find(image.args, "|center") or string.find(image.args, "|centre")) and "center" or "right" modifyImage(image, "none") --Remove all positioning elements from the image modifyImage(image, "frameless") local args = image.args args = string.gsub(args, "|thumb", "") --Don't allow using |thumb in this mode return mw.text.unstrip(mw.getCurrentFrame:expandTemplate({ title = "Image frame", args = { content="", caption=' '..image.caption.." ", align=alignment, ["max-width"]=300, mode="scrollable" }		})) .. "\n" else local captionText = (is(image.caption) and "|"..image.caption) or "" return "\n" end end

-- Attempts to construct a block from  or other templates local function getTemplateImages(text) local hasNamedArgs = mw.ustring.find(text, "|") and mw.ustring.find(text, "=") if not hasNamedArgs then return nil end -- filter out any template that obviously doesn't contain an image

-- ensure image map is captured, while removing anything beyond it	text = mw.ustring.gsub(text, '<!%-%-imagemap%-%->(%[%b[]%])[^|]+', '|imagemap=%1')

-- filter through parameters for image related ones local images = {} local parameters, _, parameterOrder = Transcluder.getParameters(text) --Search all template parameters for file-like objects local positionalImages = {} local position = 1 for _,key in ipairs(parameterOrder) do		position = position + 1 --Cant rely on ipairs due to potentially weird manipulation later local value = parameters[key] if is(value) then --Ensure its not empty if string.sub(value,1,2) == "" then --Template in a template --Extract files from the template and insert files if any appear local internalImages = getTemplateImages(value) or {} local initialPosition = position for index,image in ipairs(internalImages) do					positionalImages[initialPosition+index] = image --Still positional, technically position = position + 1 --Advance our own counter to avoid overlap end else if matchAny(key, "", captionParams, "%s*") then --Caption-like parameter name, try to associate it with an image local scanPosition = position while scanPosition > 0 do						scanPosition = scanPosition - 1 local image = positionalImages[scanPosition] if image and image.caption == "" then image.caption = mw.getCurrentFrame:preprocess(value) --Assign caption to most recently defined image break end end elseif matchAny(value, "%.", fileTypes, "%s*$") then --File-like value, assume its an image local filename,fileargs = extractFileData(value) positionalImages[position] = {file=filename,caption="",args=fileargs} elseif mw.ustring.match(key, "[Ii][Mm][Aa][Gg][Ee]") or mw.ustring.match(key, "[Pp][Hh][Oo][Tt][Oo]") or mw.ustring.match(key, "[Ss][Yy][Mm][Bb][Oo][Ll]") then --File-like parameter name, assume its an image after some scrutinization local keyLower = string.lower(key) if string.find(keyLower,"caption") or string.find(keyLower,"size") or string.find(keyLower,"width") or string.find(keyLower,"upright") or string.find(keyLower,"alt") then --Argument is defining image settings, not an image --Do nothing for now --TODO: we really should extract some of this for later use else local filename,fileargs = extractFileData(value) positionalImages[position] = {file=filename,caption="",args=fileargs} end end end --End of "Is template in template" check end --End of "is(value)" check end --Append entries from positionalImages into the main images table for i = 1,position do		local value = positionalImages[i] if value then table.insert(images,value) end end

return images end

-- a basic parser to trim down extracted wikitext --  @param text : Wikitext to be processed --  @param options : A table of options... --         options.paraflags : Which number paragraphs to keep, as either a string (e.g. '1,3-5') or a table (e.g. {1=true,2=false,3=true,4=true,5=true}. If not present, all paragraphs will be kept. --          options.fileflags : table of which files to keep, as either a string (e.g. '1,3-5') or a table (e.g. {1=true,2=false,3=true,4=true,5=true} --         options.fileargs : args for the  syntax, such as 'left' --			options.filesOnly : only return the files and not the prose local function parse(text, options) local allParagraphs = true -- keep all paragraphs? if options.paraflags then if type(options.paraflags) ~= "table" then options.paraflags = numberFlags(options.paraflags) end for _, v in pairs(options.paraflags) do			if v then allParagraphs = false end -- if any para specifically requested, don't keep all end end if is(options.filesOnly) then allParagraphs = false options.paraflags = {} end

local maxfile = 0 -- for efficiency, stop checking images after this many have been found if options.fileflags then if type(options.fileflags) ~= "table" then options.fileflags = numberFlags(options.fileflags) end for k, v in pairs(options.fileflags) do			if v and k > maxfile then maxfile = k end -- set maxfile = highest key in fileflags end end local fileArgs = options.fileargs and mw.text.trim(options.fileargs) if fileArgs == '' then fileArgs = nil end local doFancyFiles = yesno(options.doFancyFiles) if doFancyFiles == nil then doFancyFiles = true end

local leadStart = nil -- have we found some text yet? local t = "" -- the stripped down output text local fileText = "" -- output text with concatenated \n entries local files = 0 -- how many images so far local paras = 0 -- how many paragraphs so far local startLine = true -- at the start of a line (no non-spaces found since last \n)?

text = mw.ustring.gsub(text,"^%s*","") -- remove initial white space

-- Add named files local f = options.files if f and mw.ustring.match(f, "[^%d%s%-,]") then -- filename rather than number list f = mw.ustring.gsub(f, "^%s*File%s*:%s*", "", 1) f = mw.ustring.gsub(f, "^%s*Image%s*:%s*", "", 1) f = "" f = modifyImage(f, "thumb") f = modifyImage(f, fileArgs) if checkImage(f) then fileText = fileText .. f .. "\n" end end

repeat -- loop around parsing a template, image or paragraph local token = mw.ustring.match(text, "^%b{}%s*") or false -- or {| Table |} if not leadStart and not token then token = mw.ustring.match(text, "^%b<>%s*%b{}%s*") end -- allow before lead has started

local line = mw.ustring.match(text, "[^\n]*") if token and line and mw.ustring.len(token) < mw.ustring.len(line) then -- template is followed by text (but it may just be other templates) line = mw.ustring.gsub(line, "%b{}", "") -- remove all templates from this line line = mw.ustring.gsub(line, "%b<>", "") -- remove all HTML tags from this line -- if anything is left, other than an incomplete further template or an image, keep the template: it counts as part of the line if mw.ustring.find(line, "%S") and not matchAny(line, "^%s*", { "{{", "%[%[%s*[Ff]ile:", "%[%[%s*[Ii]mage:" }, "") then token = nil end end

if token then -- found a template which is not the prefix to a line of text

if is(options.keepTables) and mw.ustring.sub(token, 1, 2) == '{|' then t = t .. token -- keep tables

elseif mw.ustring.sub(token, 1, 3) == '{{#' then t = t .. token -- keep parser functions

elseif leadStart then -- lead has already started, so keep the template within the text, unless it's a whole line (navbox etc.) if not is(options.filesOnly) and not startLine then t = t .. token end

elseif matchAny(token, "^{{%s*", wantedBlockTemplates, "%s*%f[|}]") then t = t .. token -- keep wanted block templates

elseif files < maxfile then -- Check it for images if we need those, and then discard it				local images = getTemplateImages(token) or {} for _, image in ipairs(images) do					if files < maxfile and checkImage(image) then -- if image is found and qualifies (not a sound file, not non-free, etc.) files = files + 1 -- count the file, whether displaying it or not if options.fileflags and options.fileflags[files] then -- if displaying this image image = modifyImage(image, "thumb") image = modifyImage(image, fileArgs) fileText = fileText .. formatTemplateImage(image, doFancyFiles) end end end end else -- the next token in text is not a template token = parseImage(text, true) if token then -- the next token in text looks like an image if files < maxfile and checkImage(token) then -- if more images are wanted and this is a wanted image files = files + 1 if options.fileflags and options.fileflags[files] then local image = token -- copy token for manipulation by adding |right etc. without changing the original image = modifyImage(image, fileArgs) fileText = fileText .. image end end else -- got a paragraph, which ends at a file, image, blank line or end of text local afterEnd = mw.ustring.len(text) + 1 local blankPosition = mw.ustring.find(text, "\n%s*\n") or afterEnd -- position of next paragraph delimiter (or end of text) local endPosition = math.min( -- find position of whichever comes first: [[File:, [[Image: or paragraph delimiter				 mw.ustring.find(text, "%[%[%s*[Ff]ile%s*:") or afterEnd,				 mw.ustring.find(text, "%[%[%s*[Ii]mage%s*:") or afterEnd,				 blankPosition)				token = mw.ustring.sub(text, 1, endPosition-1)				if blankPosition < afterEnd and blankPosition == endPosition then -- paragraph ends with a blank line					token = token .. mw.ustring.match(text, "\n%s*\n", blankPosition)				end				local isHatnote = not(leadStart) and mw.ustring.sub(token, 1, 1) == ':'				if not isHatnote then					leadStart = leadStart or mw.ustring.len(t) + 1 -- we got a paragraph, so mark the start of the lead section					paras = paras + 1					if allParagraphs or (options.paraflags and options.paraflags[paras]) then t = t .. token end -- add if this paragraph wanted				end			end -- of "else got a paragraph"		end -- of "else not a template"

if token then text = mw.ustring.sub(text, mw.ustring.len(token)+1) end -- remove parsed token from remaining text startLine = mw.ustring.find(token, "\n%s*$") -- will the next token be the first non-space on a line? until not text or text == "" or not token or token == "" -- loop until all text parsed

text = mw.ustring.gsub(t, "\n+$", "") -- remove trailing line feeds, so "{{Transclude text excerpt|Foo}} more" flows on one line

return fileText .. text end

local function cleanupText(text, options) text = mw.ustring.gsub(text, "<!%-%-.-%-%->","") -- remove HTML comments text = mw.ustring.gsub(text, "<[Nn][Oo][Ii][Nn][Cc][Ll][Uu][Dd][Ee]>.-", "") -- remove noinclude bits 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, ".-<[Oo][Nn][Ll][Yy][Ii][Nn][Cc][Ll][Uu][Dd][Ee]>", "") -- remove text between onlyinclude sections text = mw.ustring.gsub(text, "^.-<[Oo][Nn][Ll][Yy][Ii][Nn][Cc][Ll][Uu][Dd][Ee]>", "") -- remove text before first onlyinclude section text = mw.ustring.gsub(text, ".*", "") -- remove text after last onlyinclude section end if not is(options.keepSubsections) then text = mw.ustring.gsub(text, "\n==.*","") -- remove first ==Heading== and everything after it		text = mw.ustring.gsub(text, "^==.*","") -- ...even if the lead is empty end if not is(options.keepRefs) then text = mw.ustring.gsub(text, "<%s*[Rr][Ee][Ff][^>]-/%s*>", "") -- remove refs cited elsewhere text = mw.ustring.gsub(text, "<%s*[Rr][Ee][Ff].->.-<%s*/%s*[Rr][Ee][Ff]%s*>", "") -- remove refs text = mw.ustring.gsub(text, "{%b{}}", stripTemplate) -- remove unwanted templates such as references end text = mw.ustring.gsub(text, "<%s*[Ss][Cc][Oo][Rr][Ee].->.-<%s*/%s*[Ss][Cc][Oo][Rr][Ee]%s*>", "") -- remove musical scores text = mw.ustring.gsub(text, "<%s*[Ii][Mm][Aa][Gg][Ee][Mm][Aa][Pp].->.-<%s*/%s*[Ii][Mm][Aa][Gg][Ee][Mm][Aa][Pp]%s*>", convertImageMap) -- convert imagemaps into standard images text = mw.ustring.gsub(text, "%s*{{%s*[Tt][Oo][Cc].-}}", "") -- remove most common tables of contents text = mw.ustring.gsub(text, "%s*__[A-Z]*TOC__", "") -- remove TOC behavior switches text = mw.ustring.gsub(text, "\n%s*{{%s*[Pp]p%-.-}}", "\n") -- remove protection templates text = mw.ustring.gsub(text, "%s*{{[^{|}]*[Ss]idebar%s*}}", "") -- remove most sidebars text = mw.ustring.gsub(text, "%s*{{[^{|}]*%-[Ss]tub%s*}}", "") -- remove most stub templates text = mw.ustring.gsub(text, "%s*%[%[%s*:?[Cc]ategory:.-%]%]", "") -- remove categories text = mw.ustring.gsub(text, "^:[^\n]+\n","") -- remove DIY hatnote indented with a colon return text end

-- Parse a ==Section== from a page local function getSection(text, section, mainOnly) local escapedSection = mw.ustring.gsub(mw.uri.decode(section), "([%^%$%(%)%%%.%[%]%*%+%-%?])", "%%%1") -- %26 → & etc, then ^ → %^ etc. local level, content = mw.ustring.match(text .. "\n", "\n(==+)%s*" .. escapedSection .. "%s*==.-\n(.*)") if not content then return luaError("sectionNotFound", section) end local nextSection if mainOnly then nextSection = "\n==.*" -- Main part of section terminates at any level of header else nextSection = "\n==" .. mw.ustring.rep("=?", #level - 2) .. "[^=].*" -- "===" → "\n===?[^=].*", matching "==" or "===" but not "====" end content = mw.ustring.gsub(content, nextSection, "") -- remove later sections with headings at this level or higher if mw.ustring.match(content, "^%s*$") then return luaError("sectionEmpty", section) end return content end

-- Parse a  -- @todo Implement custom parsing of fragments rather than relying on #lst local function getFragment(page, fragment) local frame = mw.getCurrentFrame local text = frame:callParserFunction('#lst', page, fragment) if mw.ustring.match(text, "^%s*$") then return luaError("fragmentEmpty", fragment) end return text end

-- Remove unmatched or tags local function fixTags(text, tag) local startCount = 0 for i in mw.ustring.gmatch(text, "<%s*" .. tag .. "%f[^%w_].->") do startCount = startCount + 1 end

local endCount = 0 for i in mw.ustring.gmatch(text, "") do endCount = endCount + 1 end

if startCount > endCount then -- more than : remove the last few s		local i = 0 text = mw.ustring.gsub(text, "<%s*" .. tag .. "%f[^%w_].->", function(t)			i = i + 1			if i > endCount then return "" else return nil end		end) -- "end" here terminates the anonymous replacement function(t) passed to gsub elseif endCount > startCount then -- more than : remove the first few s text = mw.ustring.gsub(text, "", "", endCount - startCount) end return text end

local function fixTemplates(text) repeat -- hide matched s including nested templates local t = text text = mw.ustring.gsub(text, "{(%b{})}", "\27{\27%1\27}\27") -- {{sometemplate}} → E{E{sometemplate}E}E where E represents escape text = mw.ustring.gsub(text, "(< *math[^>]*>[^<]-)}}(.-< */math *>)", "%1}\27}\27%2") -- $$\{sqrt\{hat{x}}$$ → $$\{sqrt\{hat{x}E}E$$ until text == t	text = text.gsub(text, "([{}])%1[^\27].*", "") -- remove unmatched, and everything thereafter, avoiding }E}E etc.	text = text.gsub(text, "([{}])%1$", "") -- remove unmatched , at end of text text = mw.ustring.gsub(text, "\27", "") -- unhide matched pairs: E{E{ → {{, etc.	return text end

local function fixTables(text) repeat -- hide matched {|tables|}s local t = text for potentialTable in string.gmatch(text, "\n%b{}") do			if string.sub(potentialTable, 1, 3) == "\n{|" then local innerContent = mw.ustring.sub(potentialTable, 3, -2) text = mw.ustring.gsub(text, escapeString(potentialTable), "\n\27{\27"..mw.ustring.gsub(innerContent, "%%", "%%%%").."\27}\27") -- {|sometable|} → E{E|sometable|E}E where E represents escape end end until text == t	text = mw.ustring.gsub(text, "\n{|.*", "") -- remove unmatched {| and everything after it text = mw.ustring.gsub(text, "\27", "") -- unhide matched pairs: E{E| → {|, etc.	return text end

local function fixLinks(text) repeat -- hide matched wikilinks including nested links like local t = text text = mw.ustring.gsub(text, "%[(%b[])%]", "\27[\27%1\27]\27") until text == t	text = text.gsub(text, "([%[%]])%1[^\27].*", "") -- remove unmatched or  and everything thereafter, avoiding ]E]E etc.	text = text.gsub(text, "([%[%]])%1$", "") -- remove unmatched  or  at end of text text = mw.ustring.gsub(text, "\27", "") -- unhide matched pairs: ]E]E → ]], etc.	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 = getContent(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 options.errors then errors = options.errors end

if not page or page == "" then return luaError("noPage") end

local text page, section = mw.ustring.match(page, "([^#]+)#?([^#]*)") text, page = getContent(page) if not page then return luaError("noPage") end if not text then return luaError("pageNotFound", page) end local full = text -- save the full text for later

if is(options.fragment) then text = getFragment(page, options.fragment) end

if is(section) then text = getSection(text, section) end

-- Strip text of all undersirables text = cleanupText(text, options) text = parse(text, options)

-- Replace the bold title or synonym near the start of the article by a wikilink to the article text = linkBold(text, page)

-- Remove bold text if requested if is(options.nobold) then text = mw.ustring.gsub(text, "'''", "") end

-- Keep only tables if requested if is(options.tablesOnly) then text = getTables(text) end

-- Keep only lists if requested if is(options.listsOnly) then text = getLists(text) end

-- Seek and destroy unterminated templates, tables, links and tags text = fixTemplates(text) text = fixTables(text) text = fixLinks(text) text = fixTags(text, "div")

-- Fix broken references if is(options.keepRefs) then text = fixRefs(text, page, full) end

-- Trim trailing newlines to avoid appending text weirdly text = mw.text.trim(text)

-- Add (Full article...) link if options.moreLinkText then text = text .. " (" .. options.moreLinkText .. ")" 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 text = errorMessages.prefix .. text if errorCategory and errorCategory ~= '' and mw.title.getCurrentTitle.isContentPage then text = text ..  .. errorCategory ..  end return mw.html.create('div'):addClass('error'):wikitext(text) end return frame:preprocess(text) end

local function getMoreLinkText(more) local defaultText = "Full article..." -- default text, same as in Template:TFAFULL if not more or more == '' then -- nil/empty => use default return defaultText end if not yesno(more, true) then -- falsy values => suppress the link return nil end return more end

-- Shared invocation function used by templates meant for portals local function portal(frame, template) local args = parseArgs(frame)

errors = args['errors'] or false -- disable error reporting unless requested

-- There should be at least one argument except with selected=Foo and Foo=Somepage if #args < 1 and not (template == "selected" and args[template] and args[args[template]]) then return wikiError("noPage") end

-- Figure out the page to excerpt local page local candidates = {}

if template == "lead" then page = args[1] page = mw.text.trim(page) if not page or page == "" then return wikiError("noPage") end candidates = { page }

elseif template == "selected" then local key = args[template] local count = #args if tonumber(key) then -- normalise article number into the range 1..#args key = key % count if key == 0 then key = count end end page = args[key] page = mw.text.trim(page) if not page or page == "" then return wikiError("noPage") end candidates = { page }

elseif template == "linked" or template == "listitem" then local source = args[1] local text, source = getContent(source) if not source then return wikiError("noPage") elseif not text then return wikiError("noPage") end local section = args.section if section then -- check relevant section only text = getSection(text, section) if not text then return wikiError("sectionNotFound", section) end end -- Replace annotated links with real links text = mw.ustring.gsub(text, "{{%s*[Aa]nnotated[ _]link%s*|%s*(.-)%s*}}", "%1") if template == "linked" then for candidate in mw.ustring.gmatch(text, "%[%[%s*([^%]|\n]*)") do table.insert(candidates, candidate) end else -- listitem: first wikilink on a line beginning *, :#, etc. except in "See also" or later section text = mw.ustring.gsub(text, "\n== *See also.*", "") for candidate in mw.ustring.gmatch(text, "\n:*[%*#][^\n]-%[%[%s*([^%]|\n]*)") do table.insert(candidates, candidate) end end

elseif template == "random" then for key, value in pairs(args) do			if value and type(key) == "number" then table.insert(candidates, mw.text.trim(value)) end end end

-- Build an options array for the Excerpt module out of the arguments and the desired defaults local options = { errors = args['errors'] or false, fileargs = args['fileargs'], fileflags = numberFlags( args['files'] ), paraflags = numberFlags( args['paragraphs'] ), moreLinkText = getMoreLinkText(args['more'] ), keepSubsections = args['keepSubsections'], keepRefs = args['keepRefs'], nobold = args['nobold'], doFancyFiles = args['fancyfiles'] }

-- Select a random candidate and make sure its valid local text local candidateCount = #candidates if candidateCount > 0 then local candidateKey = 1 local candidateString local candidateArgs if candidateCount > 1 then math.randomseed(os.time) end while (not text or text == "") and candidateCount > 0 do			if candidateCount > 1 then candidateKey = math.random(candidateCount) end -- pick a random candidate candidateString = candidates[candidateKey] if candidateString and candidateString ~= "" then -- We have page or page or text, possibly followed by |opt1|opt2... page, candidateArgs = mw.ustring.match(candidateString, "^%s*(%[%b[]%])%s*|?(.*)") if page and page ~= "" then page = mw.ustring.match(page, "%[%[([^|%]]*)") -- turn text into page, discarding text else -- we have page or page|opt... page, candidateArgs = mw.ustring.match(candidateString, "%s*([^|]*[^|%s])%s*|?(.*)") end -- candidate arguments (even if value is "") have priority over global arguments if candidateArgs and candidateArgs ~= "" then for _, t in pairs(mw.text.split(candidateArgs, "|")) do						local k, v = mw.ustring.match(t, "%s*([^=]-)%s*=(.-)%s*$") if k == 'files' then options.fileflags = numberFlags(v) elseif k == 'paragraphs' then options.paraflags = numberFlags(v) elseif k == 'more' then args.more = v						else options[k] = v end end end if page and page ~= "" then local section = mw.ustring.match(page, "[^#]+#([^#]+)") -- save the section text, page = getContent(page) -- make sure the page exists if page and page ~= "" and text and text ~= "" then if args.nostubs then local isStub = mw.ustring.find(text, "%s*{{[^{|}]*%-[Ss]tub%s*}}") if isStub then text = nil end end if section and section ~= "" then page = page .. '#' .. section -- restore the section end text = get(page, options) end end end table.remove(candidates, candidateKey) -- candidate processed candidateCount = candidateCount - 1 -- ensure that we exit the loop after all candidates are done end end if not text or text == "" then return wikiError("No valid pages found") end

if args.showall then local separator = args.showall if separator == "" then separator = "{{clear}}{{hr}}" end for _, candidate in pairs(candidates) do			local t = get(candidate, options) if t ~= "" then text = text .. separator .. t			end end end

-- Add a collapsed list of pages which might appear if args.list and not args.showall then local list = args.list if list == "" then list = "Other articles" end text = text .. "{{collapse top|title={{resize|85%|" ..list .. "}}|bg=fff}}{{hlist" for _, candidate in pairs(candidates) do if mw.ustring.match(candidate, "%S") then text = text .. "|" .. mw.text.trim(candidate) .. "" end end text = text .. "}}\n{{collapse bottom}}" end

return frame:preprocess(text) end

-- Old invocation function used by {{Excerpt}} local function excerpt(frame) local args = parseArgs(frame)

-- Make sure the requested page exists local page = args[1] or args.article or args.source or args.page if not page then return wikiError("noPage") end local title = mw.title.new(page) if not title then return wikiError("noPage") end if title.isRedirect then title = title.redirectTarget end if not title.exists then return wikiError("pageNotFound", page) end page = title.prefixedText

-- Define some useful variables local section = args[2] or args.section or mw.ustring.match(args[1], "[^#]+#([^#]+)") local tag = args.tag or 'div'

-- Define the HTML elements local block = mw.html.create(tag):addClass('excerpt-block') if is(args.indicator) then block:addClass('excerpt-indicator') end

local style = frame:extensionTag{ name = 'templatestyles', args = { src = 'Excerpt/styles.css' } }

local hatnote if not args.nohat then if args.this then hatnote = args.this elseif args.indicator then hatnote = 'This is' elseif args.only == 'file' then hatnote = 'This file is' elseif args.only == 'file' then hatnote = 'These files are' elseif args.only == 'list' then hatnote = 'This list is' elseif args.only == 'lists' then hatnote = 'These lists are' elseif args.only == 'table' then hatnote = 'This table is' elseif args.only == 'tables' then hatnote = 'These tables are' else hatnote = 'This section is' end hatnote = hatnote .. ' an excerpt from ' if section then hatnote = hatnote ..  .. page .. ' § ' .. section ..  else hatnote = hatnote ..  .. page ..  end hatnote = hatnote .. "''" .. ' [ ['		hatnote = hatnote .. title:fullUrl('action=edit') .. ' edit' hatnote = hatnote .. '] ] ' .. "''"		hatnote = require('Module:Hatnote')._hatnote(hatnote, {selfref=true}) or wikiError('Error generating hatnote') end

-- Build the module options out of the template arguments and the desired defaults local options = { fileflags = numberFlags( args['files'] or 1 ), paraflags = numberFlags( args['paragraphs'] ), filesOnly = is( args['only'] == 'file' or args['only'] == 'files' ), listsOnly = is( args['only'] == 'list' or args['only'] == 'lists'), tablesOnly = is( args['only'] == 'table' or args['only'] == 'tables' ), keepTables = is( args['tables'] or true ), keepRefs = is( args['references'] or true ), keepSubsections = is( args['subsections'] ), nobold = not is( args['bold'] ), fragment = args['fragment'] }

-- Get the excerpt itself if section then page = page .. '#' .. section end local ok, excerpt = pcall(e.get, page, options) if not ok then return wikiError(excerpt) end excerpt = "\n" .. excerpt -- line break is necessary to prevent broken tables and lists if mw.title.getCurrentTitle.isContentPage then excerpt = excerpt .. '' end excerpt = frame:preprocess(excerpt) excerpt = mw.html.create(tag):addClass('excerpt'):wikitext(excerpt)

-- Combine and return the elements return block:node(style):node(hatnote):node(excerpt) end

-- Entry points for templates function p.main(frame) return main(frame) end function p.lead(frame) return portal(frame, "lead") end -- {{Transclude lead excerpt}} reads a randomly selected article linked from the given page function p.linked(frame) return portal(frame, "linked") end -- {{Transclude linked excerpt}} reads a randomly selected article linked from the given page function p.listitem(frame) return portal(frame, "listitem") end -- {{Transclude list item excerpt}} reads a randomly selected article listed on the given page function p.random(frame) return portal(frame, "random") end -- {{Transclude random excerpt}} reads any article (default for invoke with one argument) function p.selected(frame) return portal(frame, "selected") end -- {{Transclude selected excerpt}} reads the article whose key is in the selected= parameter function p.excerpt(frame) return excerpt(frame) end -- {{Excerpt}} transcludes part of an article into another article

-- Entry points for other Lua modules function p.get(page, options) return get(page, options) end function p.getContent(page) return getContent(page) end function p.getSection(text, section) return getSection(text, section) end function p.getTables(text, options) return getTables(text, options) end function p.getLists(text, options) return getLists(text, options) end function p.parse(text, options) return parse(text, options) end function p.parseImage(text, start) return parseImage(text, start) end function p.parseArgs(frame) return parseArgs(frame) end function p.getTemplateImages(text) return getTemplateImages(text) end function p.checkImage(image) return checkImage(image) end function p.cleanupText(text, options) return cleanupText(text, options) end function p.numberFlags(str) return numberFlags(str) end function p.getMoreLinkText(more) return getMoreLinkText(more) end

return p