Module:Excerpt/portals

Documentation for this module may be created at Module:Excerpt/portals/doc

-- ATTENTION !
-- This module is deprecated
-- 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", "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[^=|]*"
}

-- 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",
	-- 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"
}

-- 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[^|}]*", -- all 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 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
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 "<!--imagemap-->[[" .. 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 {{Airreg}} 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 {{audio}} by its text parameter: {{Audio|Foo.ogg|Bar}} → Bar
	noRef = mw.ustring.gsub(noRef, "^{{%s*[Aa]udio.-|.-|(.-)%f[|}].*", "%1")

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

	-- Replace {{Airreg}} by its text parameter: {{Airreg|N|485US|,}} → N485US,
	noRef = mw.ustring.gsub(noRef, "^{{%s*[Aa]irreg%s*|%s*(.-)}}", 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)
	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.)
	local fileTypes = {"[Gg][Ii][Ff]", "[Jj][Pp][Ee]?[Gg]", "[Pp][Nn][Gg]", "[Ss][Vv][Gg]", "[Tt][Ii][Ff][Ff]", "[Xx][Cc][Ff]"}
	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("{{" .. fileTitle .. "}}")
	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 [[File:...]] or [[Image:...]], 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

-- Parse a caption, which ends at a | (end of parameter) or } (end of infobox) but may contain nested [..] and {..}
local function parseCaption(caption)
	if not caption then return nil end
	local length = mw.ustring.len(caption)
	local position = 1
	while position <= length do
		local linkStart, linkEnd = mw.ustring.find(caption, "%b[]", position)
		linkStart = linkStart or length + 1 -- avoid comparison with nil when no link
		local templateStart, templateEnd = mw.ustring.find(caption, "%b{}", position)
		templateStart = templateStart or length + 1 -- avoid comparison with nil when no template
		local argEnd = mw.ustring.find(caption, "[|}]", position) or length + 1
		if linkStart < templateStart and linkStart < argEnd then
			position = linkEnd + 1 -- skip wikilink
		elseif templateStart < argEnd then
			position = templateEnd + 1 -- skip template
		else -- argument ends before the next wikilink or template
			return mw.ustring.sub(caption, 1, argEnd - 1)
		end
	end
	return caption -- No terminator found: return entire caption
end					

-- Attempt to construct a [[File:...]] block from {{infobox ... |image= ...}}
local function argImage(text)
	local token = nil
	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
	text = mw.ustring.gsub(text, '<!%-%-imagemap%-%->', '|imagemap=')

	-- find all images
	local hasImages = false
	local images = {}
	local captureFrom = 1
	while captureFrom < mw.ustring.len(text) do
		local argname, position, image = mw.ustring.match(text, "|%s*([^=|]-[Ii][Mm][Aa][Gg][Ee][^=|]-)%s*=%s*()(.*)", captureFrom)
		if image then -- ImageCaption=, image_size=, image_upright=, etc. do not introduce an image
			local lcArgName = mw.ustring.lower(argname)
			if mw.ustring.find(lcArgName, "caption")
			 or mw.ustring.find(lcArgName, "size")
			 or mw.ustring.find(lcArgName, "upright") then
				image = nil
			end
		end
		if image then
			hasImages = true
			images[position] = image
			captureFrom = position
		else
			captureFrom = mw.ustring.len(text)
		end
	end
	captureFrom = 1
	while captureFrom < mw.ustring.len(text) do
		local position, image = mw.ustring.match(text, "|%s*[^=|]-[Pp][Hh][Oo][Tt][Oo][^=|]-%s*=%s*()(.*)", captureFrom)
		if image then
			hasImages = true
			images[position] = image
			captureFrom = position
		else
			captureFrom = mw.ustring.len(text)
		end
	end
	captureFrom = 1
	while captureFrom < mw.ustring.len(text) do
		local position, image = mw.ustring.match(text, "|%s*[^=|{}]-%s*=%s*()%[?%[?([^|{}]*%.%a%a%a%a?)%s*%f[|}]", captureFrom)
		if image then
			hasImages = true
			if not images[position] then
				images[position] = image
			end
			captureFrom = position
		else
			captureFrom = mw.ustring.len(text)
		end
	end

	if not hasImages then return nil end

	-- find all captions
	local captions = {}
	captureFrom = 1
	while captureFrom < mw.ustring.len(text) do
		local position, caption = matchAny(text, "|%s*", captionParams, "%s*=%s*()([^\n]+)", captureFrom)
		if caption then
			-- extend caption to parse "| caption = Foo {{Template\n on\n multiple lines}} Bar\n"
			local bracedCaption = mw.ustring.match(text, "^[^\n]-%b{}[^\n]+", position)
			if bracedCaption and bracedCaption ~= "" then caption = bracedCaption end
			caption = mw.text.trim(caption)
			local captionStart = mw.ustring.sub(caption, 1, 1)
			if captionStart == '|' or captionStart == '}' then caption = nil end
		end
		if caption then
			-- find nearest image, and use same index for captions table
			local i = position
			while i > 0 and not images[i] do
				i = i - 1
				if images[i] then
					if not captions[i] then
						captions[i] = parseCaption(caption)
					end
				end
			end
			captureFrom = position
		else
			captureFrom = mw.ustring.len(text)
		end
	end

	-- find all alt text
	local altTexts = {}
	for position, altText in mw.ustring.gmatch(text, "|%s*[Aa][Ll][Tt]%s*=%s*()([^\n]*)") do
		if altText then

			-- altText is terminated by }} or |, but first skip any matched [[...]] and {{...}}
			local lookFrom = math.max( -- find position after whichever comes last: start of string, end of last ]] or end of last }}
			 mw.ustring.match(altText, ".*{%b{}}()") or 1, -- if multiple {{...}}, .* consumes all but one, leaving the last for %b
			 mw.ustring.match(altText, ".*%[%b[]%]()") or 1)

			local length = mw.ustring.len(altText)
			local afterText = math.min( -- find position after whichever comes first: end of string, }} or |
			 mw.ustring.match(altText, "()}}", lookFrom) or length+1,
			 mw.ustring.match(altText, "()|", lookFrom) or length+1)
			altText = mw.ustring.sub(altText, 1, afterText-1) -- chop off |... or }}... which is not part of [[...]] or {{...}}

			altText = mw.text.trim(altText)
			local altTextStart = mw.ustring.sub(altText, 1, 1)
			if altTextStart == '|' or altTextStart == '}' then altText = nil end
		end
		if altText then
			-- find nearest image, and use same index for altTexts table
			local i = position
			while i > 0 and not images[i] do
				i = i - 1
				if images[i] then
					if not altTexts[i] then
						altTexts[i] = altText
					end
				end
			end
		end
	end

	-- find all image sizes
	local imageSizes = {}
	for position, imageSizeMatch in mw.ustring.gmatch(text, "|%s*[Ii][Mm][Aa][Gg][Ee][ _]?[Ss][Ii][Zz][Ee]%s*=%s*()([^}|\n]*)") do
		local imageSize = mw.ustring.match(imageSizeMatch, "=%s*([^}|\n]*)")
		if imageSize then
			imageSize = mw.text.trim(imageSize )
			local imageSizeStart = mw.ustring.sub(imageSize, 1, 1)
			if imageSizeStart == '|' or imageSizeStart == '}' then imageSize = nil end
		end
		if imageSize then
			-- find nearest image, and use same index for imageSizes table
			local i = position
			while i > 0 and not images[i] do
				i = i - 1
				if images[i] then
					if not imageSizes[i] then
						imageSizes[i] = imageSize
					end
				end
			end
		end
	end

	-- sort the keys of the images table (in a table sequence), so that images can be iterated over in order
	local keys = {}
	for key, val in pairs(images) do
		table.insert(keys, key)
	end
	table.sort(keys)

	 -- add in relevant optional parameters for each image: caption, alt text and image size
	local imageTokens = {}
	for _, index in ipairs(keys) do
		local image = images[index]
		local token = parseImage(image, true) -- look for image=[[File:...]] etc.
		if not token then
			image = mw.ustring.match(image, "^[^}|\n]*") -- remove later arguments
			token = "[[" -- Add File: unless name already begins File: or Image:
			if not matchAny(image, "^", fileNamespaces, "%s*:") then
				token = token .. "File:"
			end
			token = token .. image
			local caption = captions[index]
			if caption and mw.ustring.match(caption, "%S") then token = token .. "|" .. caption end
			local alt = altTexts[index]
			if alt then token = token .. "|alt=" .. alt end
			local image_size = imageSizes[index]
			if image_size and mw.ustring.match(image_size, "%S") then token = token .. "|" .. image_size end
			token = token .. "]]"
		end
		token = mw.ustring.gsub(token, "\n","") .. "\n"
		table.insert(imageTokens, token)
	end
	return imageTokens
end

local function modifyImage(image, fileArgs)
	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", "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

-- 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 [[File:]] 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 leadStart = nil -- have we found some text yet?
	local t = "" -- the stripped down output text
	local fileText = "" -- output text with concatenated [[File:Foo|...]]\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 = "[[File:" .. 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 -- {{Template}} or {| Table |}
		if not leadStart and not token then token = mw.ustring.match(text, "^%b<>%s*%b{}%s*") end -- allow <tag>{{template}} 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 -- discard template, but if we are still collecting images...
				local images = argImage(token) or {}
				if not images then
					local image = parseImage(token, false) -- look for embedded [[File:...]], |image=, etc.
					if image then table.insert(images, image) end
				end
				for _, image in ipairs(images) do
					if files < maxfile and checkImage(image) then -- if image is found and qualifies (not a sound file, 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 .. image
						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]>.-</[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]>.-<[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, "</[Oo][Nn][Ll][Yy][Ii][Nn][Cc][Ll][Uu][Dd][Ee]>.*", "") -- 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 <section begin="Name of the fragment">
-- @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 <tag> or </tag> 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, "<%s*/" .. tag .. "%f[^%w_].->") do endCount = endCount + 1 end

	if startCount > endCount then -- more <tag> than </tag>: remove the last few <tag>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 </tag> than <tag>: remove the first few </tag>s
		text = mw.ustring.gsub(text, "<%s*/" .. tag .. "%f[^%w_].->", "", endCount - startCount)
	end
	return text
end

local function fixTemplates(text)
	repeat -- hide matched {{template}}s including nested templates
		local t = text
		text = mw.ustring.gsub(text, "{(%b{})}", "\27{\27%1\27}\27") -- {{sometemplate}} → E{Esometemplate}E}E where E represents escape
		text = mw.ustring.gsub(text, "(< *math[^>]*>[^<]-)}}(.-< */math *>)", "%1}\27}\27%2") -- <math>\{sqrt\{hat{x}}</math> → <math>\{sqrt\{hat{x}E}E</math>
	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 fixLinks(text)
	repeat -- hide matched [[wikilink]]s including nested links like [[File:Example.jpg|Some [[nested]] link.]]
		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 <ref name="Foo"> for <ref name="Title of the article Foo">
-- and also <ref name="Foo" /> for <ref name="Title of the article Foo" />
-- also remove reference groups: <ref name="Foo" group="Bar"> for <ref name="Title of the article Foo">
-- and <ref group="Bar"> for <ref>
-- @todo The current regex may fail in cases with both kinds of quotes, like <ref name="Darwin's book">
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*>", '<ref name="' .. page .. ' %1" %2>')
	text = mw.ustring.gsub(text, "<%s*[Rr][Ee][Ff][^>]*group%s*=%s*[\"']?[^\"'>/]+[\"']%s*>", '<ref>')
	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 "'''[[" .. page .. "|" .. b .. "]]'''" -- replace '''Foo''' by '''[[page|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, links and tags
	text = fixTemplates(text)
	text = fixLinks(text)
	text = fixTags(text, "div")

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

	-- Add (Full article...) link
	if options.moreLinkText then
		text = text .. " ('''[[" .. page .. "|" .. 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']
	}

	-- 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 [[page|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 [[page|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 .. '|' .. page .. ' § ' .. section .. ']]'
		else
			hatnote = hatnote .. '[[' .. page .. ']]'
		end
		hatnote = hatnote .. "''" .. '<span class="mw-editsection-like plainlinks"><span class="mw-editsection-bracket">[</span>['
		hatnote = hatnote .. title:fullUrl('action=edit') .. ' edit'
		hatnote = hatnote .. ']<span class="mw-editsection-bracket">]</span></span>' .. "''"
		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 .. '[[Category:Articles with excerpts]]' 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.wikiError(message, value) return wikiError(message, value) 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.argImage(text) return argImage(text) end
function p.checkImage(image) return checkImage(image) end
function p.cleanupText(text, options) return cleanupText(text, options) end
function p.luaError(message, value) return luaError(message, value) end
function p.is(value) return is(value) end
function p.numberFlags(str) return numberFlags(str) end
function p.getMoreLinkText(more) return getMoreLinkText(more) end

-- Entry points for backwards compatibility
function p.getsection(text, section) return getSection(text, section) end
function p.parseimage(text, start) return parseImage(text, start) end
function p.checkimage(image) return checkImage(image) end
function p.argimage(text) return argImage(text) end
function p.numberflags(str) return numberFlags(str) end

return p