Module:Transcluder

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Module:Transcluder is a general-purpose transclusion engine, able to transclude any part of any page and with many options that normal transclusion doesn't provide.

Usage

Modules

The main entry point for modules is the get method.

• get( 'Title' ) — Get the requested page (exact same result as normal transclusion)
• get( 'Title#' ) — Get the lead section of the requested page
• get( 'Title#Section' ) — Get the requested section or <section> tag (includes any subsections)

<noinclude> and <onlyinclude> tags are handled the usual way and there's also an optional second parameter to exclude various elements from the result:

• get( 'Title#Section', { files = 0 } ) — Exclude all files
• get( 'Title#Section', { files = 1 } ) — Exclude all files except the first
• get( 'Title#Section', { files = 2 } ) — Exclude all files except the second
• get( 'Title#Section', { files = '1,2' } ) — Exclude all files except the first and second
• get( 'Title#Section', { files = '1-3' } ) — Exclude all files except the first, second and third
• get( 'Title#Section', { files = '1,3-5' } ) — Exclude all files except the first, third, fourth and fifth
• get( 'Title#Section', { files = -2 } ) — Exclude the second file
• get( 'Title#Section', { files = '-2,3' } ) — Exclude the second and third files
• get( 'Title#Section', { files = '-1,3-5' } ) — Exclude the first, third, fourth and fifth files
• get( 'Title#Section', { files = 'A.png' } ) — Exclude all files except A.png
• get( 'Title#Section', { files = '-A.png' } ) — Exclude A.png
• get( 'Title#Section', { files = 'A.png, B.jpg, C.gif' } ) — Exclude all files except A.png, B.jpg and C.gif
• get( 'Title#Section', { files = '-A.png, B.jpg, C.gif' } ) — Exclude A.png, B.jpg and C.gif
• get( 'Title#Section', { files = { [1] = true, [3] = true } } ) — Exclude all files except the first and third
• get( 'Title#Section', { files = { [1] = false, [3] = false } } ) — Exclude the first and third files
• get( 'Title#Section', { files = { ['A.png'] = false, ['B.jpg'] = false } } ) — Exclude A.png and B.jpg
• get( 'Title#Section', { files = '.+%.png' } ) — Exclude all files except PNG files (see Lua patterns)
• get( 'Title#Section', { files = '-.+%.png' } ) — Exclude all PNG files

The very same syntax can be used to exclude many other elements:

• get( 'Title#Section', { sections = 0 } ) — Exclude all subsections
• get( 'Title#Section', { sections = 'History, Causes' } ) — Exclude all subsections except 'History' and 'Causes'
• get( 'Title#Section', { lists = 1 } ) — Exclude all lists except the first
• get( 'Title#Section', { tables = 'stats' } ) — Exclude all tables except the one with id 'stats'
• get( 'Title#Section', { paragraphs = '1-3' } ) — Exclude all paragraphs except the first, second and third
• get( 'Title#Section', { references = 0 } ) — Exclude all references
• get( 'Title#Section', { categories = '0' } ) — Exclude all categories
• get( 'Title#Section', { templates = '-.+infobox' } ) — Exclude infobox templates
• get( 'Title#Section', { parameters = 'image' } ) — Exclude all parameters from all templates except the one named 'image'

Options can be combined at will. For example:

• get( 'Title#Section', { sections = 0, files = 1, paragraphs = '1-3' } ) — Exclude all subsections, all files except the first, and all paragraphs except the first three

You can also get only some elements like so:

• get( 'Title#Section', { only = 'files' } ) — Get only the files
• get( 'Title#Section', { only = 'lists', lists = 1 } ) — Get only the first list
• get( 'Title#Section', { only = 'tables', tables = 'stats' } ) — Get only the table with id 'stats'
• get( 'Title#Section', { only = 'paragraphs', paragraphs = '1,3-5' } ) — Get only the first, third, fourth and fifth paragraph
• get( 'Title#Section', { only = 'templates', templates = 'Infobox' } ) — Get only the infobox
• get( 'Title#Section', { only = 'files, lists', files = 1 } ) — Get only the first file, followed by all the lists

The output can be further modified with a few special options:

• get( 'Title#Section', { noFollow = true } ) — Don't follow redirects
• get( 'Title#Section', { linkBold = true } ) — Link the bold title or synonym near the start of the text
• get( 'Title#Section', { noBold = true } ) — Remove bold text
• get( 'Title#Section', { noSelfLinks = true } ) — Remove self links
• get( 'Title#Section', { noBehaviorSwitches = true } ) — Remove behavior switches such as __NOTOC__
• get( 'Title#Section', { fixReferences = true } ) — Prefix reference names with 'Title ' to avoid name conflicts when transcluding and rescue references defined outside the requested section to avoid undefined reference errors

Besides the get method, the module exposes several other methods to get specific parts of the wikitext. This allows other modules to combine elements in more advanced ways.

Templates

The main entry point for templates is the main method. It's essentially a wrapper of the get method to make it usable for templates.

See the documentation of the get method for more details and options.

• {{#invoke:Transcluder|main|Title}} — Transclude the requested page
• {{#invoke:Transcluder|main|Title#}} — Transclude the lead section of the requested page
• {{#invoke:Transcluder|main|Title#Section}} — Transclude the requested section or <section> tag (includes any subsections)
• {{#invoke:Transcluder|main|Title#Section|sections=0}} — Transclude the requested section, excluding subsections
• {{#invoke:Transcluder|main|Title|only=files|files=1}} — Transclude only the first file of the page
• {{#invoke:Transcluder|main|Title#Section|only=tables|tables=2}} — Transclude only the second table of the requested section
• {{#invoke:Transcluder|main|Title#|only=paragraphs|linkBold=yes}} — Transclude only the paragraphs of the lead section and link the bold text

See also

• Module:Transcluder/testcases
• c:Data:i18n/Module:Transcluder.tab

---

local p = {}

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

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

local function escapeString(str)
	return mw.ustring.gsub(str, '[%^%$%(%)%.%[%]%*%+%-%?%%]', '%%%0')
end

-- Helper function to remove a string from a text
local function removeString(text, str)
	local pattern
	if #str > 9999 then -- strings longer than 10000 bytes can't be put into regexes
		pattern = escapeString(mw.ustring.sub(str, 1, 999)) .. '.-' .. escapeString(mw.ustring.sub(str, -999))
	else
		pattern = escapeString(str)
	end
	return mw.ustring.gsub(text, pattern, '')
end

-- Helper function to convert a comma-separated list of numbers or min-max ranges into a list of booleans
-- @param flags Comma-separated list of numbers or min-max ranges, for example '1,3-5'
-- @return Map from integers to booleans, for example {1=true,2=false,3=true,4=true,5=true}
-- @return Boolean indicating wether the flags should be treated as a blacklist or not
local function parseFlags(value)
	local flags = {}
	local blacklist = false

	if not value then return nil, false end

	if type(value) == 'number' then
		if value < 0 then
			value = value * -1
			blacklist = true
		end
		flags = { [value] = true }

	elseif type(value) == 'string' then
		if mw.ustring.sub(value, 1, 1) == '-' then
			blacklist = true
			value = mw.ustring.sub(value, 2)
		end
		local ranges = mw.text.split(value, ',') -- split ranges: '1,3-5' to {'1','3-5'}
		for _, range in pairs(ranges) do
			range = mw.text.trim(range)
			local min, max = mw.ustring.match(range, '^(%d+)%s*%-%s*(%d+)$') -- '3-5' to min=3 max=5
			if not max then	min, max = mw.ustring.match(range, '^((%d+))$') end -- '1' to min=1 max=1
			if max then
				for p = min, max do flags[p] = true end
			else
				flags[range] = true -- if we reach this point, the string had the form 'a,b,c' rather than '1,2,3'
			end
		end

	elseif type(value) == 'table' then

		-- List has the form { [1] = false, [2] = true, ['c'] = false }
		-- Convert it to { [1] = true, [2] = true, ['c'] = true }
		-- But if ANY value is set to false, treat the list as a blacklist
		for i, v in pairs(value) do
			if v == false then blacklist = true end
			flags[i] = true
		end
	end

	return flags, blacklist
end

-- Helper function to see if a value matches any of the given flags
local function matchFlag(value, flags)
	if type(value) == 'number' then value = tostring(value) end
	local lang = mw.language.getContentLanguage()
	for flag in pairs(flags) do
		if lang:lcfirst(value) == flag
		or lang:ucfirst(value) == flag
		or mw.ustring.match(value, flag) then
			return true
		end
	end
end

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

-- Error handling function
-- Throws a Lua error or returns an empty string if error reporting is disabled
local function throwError(key, value)
	local TNT = require('Module:TNT')
	local ok, message = pcall(TNT.format, 'I18n/Module:Transcluder.tab', 'error-' .. key, value)
	if not ok then message = key end
	error(message, 2)
end

-- Error handling function
-- Returns a wiki friendly error or an empty string if error reporting is disabled
local function getError(key, value)
	local TNT = require('Module:TNT')
	local ok, message = pcall(TNT.format, 'I18n/Module:Transcluder.tab', 'error-' .. key, value)
	if not ok then message = key end
	message = mw.html.create('div'):addClass('error'):wikitext(message)
	return message
end

-- Helper function to get the local name of a namespace and all its aliases
-- @param name Canonical name of the namespace, for example 'File'
-- @return Local name of the namespace and all aliases, for example {'File','Image','Archivo','Imagen'}
local function getNamespaces(name)
	local namespaces = mw.site.namespaces[name].aliases
	table.insert(namespaces, mw.site.namespaces[name].name)
	table.insert(namespaces, mw.site.namespaces[name].canonicalName)
	return namespaces
end

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

	local target = title.redirectTarget
	if target and not noFollow then title = target end

	return title:getContent(), title.prefixedText
end

-- Get the requested files out of the given wikitext.
-- @param text Required. Wikitext to parse.
-- @param flags Range of files to return, for example 2 or '1,3-5'. Omit to return all files.
-- @return Sequence of strings containing the wikitext of the requested files.
-- @return Original wikitext minus non-requested files.
local function getFiles(text, flags)
	local files = {}
	local flags, blacklist = parseFlags(flags)
	local fileNamespaces = getNamespaces('File')
	local name
	local count = 0
	for file in mw.ustring.gmatch(text, '%b[]') do
		if matchAny(file, '%[%[%s*', fileNamespaces, '%s*:.*%]%]') then
			name = mw.ustring.match(file, '%[%[[^:]-:([^]|]+)')
			count = count + 1
			if not blacklist and ( not flags or flags[count] or matchFlag(name, flags) )
			or blacklist and flags and not flags[count] and not matchFlag(name, flags) then
				table.insert(files, file)
			else
				text = removeString(text, file)
			end
		end
	end

	return files, text
end

-- Get the requested tables out of the given wikitext.
-- @param text Required. Wikitext to parse.
-- @param flags Range of tables to return, for example 2 or '1,3-5'. Omit to return all tables.
-- @return Sequence of strings containing the wikitext of the requested tables.
-- @return Original wikitext minus non-requested tables.
local function getTables(text, flags)
	local tables = {}
	local flags, blacklist = parseFlags(flags)
	local id
	local count = 0
	for t in mw.ustring.gmatch('\n' .. text, '\n%b{}') do
		if mw.ustring.sub(t, 1, 3) == '\n{|' then
			id = mw.ustring.match(t, '\n{|[^\n]-id%s*=%s*["\']?([^"\'\n]+)["\']?[^\n]*\n')
			count = count + 1
			if not blacklist and ( not flags or flags[count] or flags[id] )
			or blacklist and flags and not flags[count] and not flags[id] then
				table.insert(tables, t)
			else
				text = removeString(text, t)
			end
		end
	end
	return tables, text
end

-- Get the requested templates out of the given wikitext.
-- @param text Required. Wikitext to parse.
-- @param flags Range of templates to return, for example 2 or '1,3-5'. Omit to return all templates.
-- @return Sequence of strings containing the wikitext of the requested templates.
-- @return Original wikitext minus non-requested templates.
local function getTemplates(text, flags)
	local templates = {}
	local flags, blacklist = parseFlags(flags)
	local name
	local count = 0
	for template in mw.ustring.gmatch(text, '{%b{}}') do
		if mw.ustring.sub(template, 1, 3) ~= '{{#' then -- skip parser functions like #if
			name = mw.text.trim( mw.ustring.match(template, '{{([^}|\n]+)') ) -- get the template name
			count = count + 1
			if not blacklist and ( not flags or flags[count] or matchFlag(name, flags) )
			or blacklist and flags and not flags[count] and not matchFlag(name, flags) then
				table.insert(templates, template)
			else
				text = removeString(text, template)
			end
		end
	end
	return templates, text
end

-- Get the requested template parameters out of the given wikitext.
-- @param text Required. Wikitext to parse.
-- @param flags Range of parameters to return, for example 2 or '1,3-5'. Omit to return all parameters.
-- @return Map from parameter name to value, NOT IN THE ORIGINAL ORDER
-- @return Original wikitext minus non-requested parameters.
local function getParameters(text, flags)
	local parameters = {}
	local flags, blacklist = parseFlags(flags)
	local params, count, parts, key, value
	for template in mw.ustring.gmatch(text, '{%b{}}') do
		params = mw.ustring.match(template, '{{[^|}]-|(.+)}}')
		if params then
			count = 0
			-- Temporarily replace pipes in subtemplates, tables and links to avoid chaos
			for subtemplate in mw.ustring.gmatch(params, '%b{}') do
				params = mw.ustring.gsub(params, escapeString(subtemplate), mw.ustring.gsub(mw.ustring.gsub(subtemplate, '%%', '%%%'), '|', '@@@') )
			end
			for link in mw.ustring.gmatch(params, '%b[]') do
				params = mw.ustring.gsub(params, escapeString(link), mw.ustring.gsub(link, '|', '@@@') )
			end
			for parameter in mw.text.gsplit(params, '|') do
				parts = mw.text.split(parameter, '=')
				key = mw.text.trim(parts[1])
				value = table.concat(parts, '=', 2)
				if value == '' then
					value = key
					count = count + 1
					key = count
				else
					value = mw.text.trim(value)
				end
				value = mw.ustring.gsub(value, '@@@', '|')
				if not blacklist and ( not flags or matchFlag(key, flags) )
				or blacklist and flags and not matchFlag(key, flags) then
					parameters[key] = value
				else
					text = removeString(text, parameter)
				end
			end
		end
	end
	return parameters, text
end

-- Get the requested lists out of the given wikitext.
-- @param text Required. Wikitext to parse.
-- @param flags Range of lists to return, for example 2 or '1,3-5'. Omit to return all lists.
-- @return Sequence of strings containing the wikitext of the requested lists.
-- @return Original wikitext minus non-requested lists.
local function getLists(text, flags)
	local lists = {}
	local flags, blacklist = parseFlags(flags)
	local count = 0
	for list in mw.ustring.gmatch('\n' .. text .. '\n\n', '\n([*#].-)\n[^*#]') do
		count = count + 1
		if not blacklist and ( not flags or flags[count] )
		or blacklist and flags and not flags[count] then
			table.insert(lists, list)
		else
			text = removeString(text, list)
		end
	end
	return lists, text
end

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

	-- Remove non-paragraphs
	local elements
	local temp = '\n' .. text .. '\n'
	elements, temp = getLists(temp, 0) -- remove lists
	elements, temp = getFiles(temp, 0) -- remove files
	temp = mw.ustring.gsub(temp, '\n%b{}\n', '\n%0\n') -- add spacing between tables and block templates
	temp = mw.ustring.gsub(temp, '\n%b{}\n', '\n') -- remove tables and block templates
	temp = mw.ustring.gsub(temp, '\n==+[^=]+==+\n', '\n') -- remove section titles
	temp = mw.ustring.gsub(temp, '\n\n\n+', '\n\n')
	temp = mw.text.trim(temp)

	-- Assume that anything remaining is a paragraph
	local count = 0
	for paragraph in mw.text.gsplit(temp, '\n\n') do
		if mw.text.trim(paragraph) ~= '' then
			count = count + 1
			if not blacklist and ( not flags or flags[count] )
			or blacklist and flags and not flags[count] then
				table.insert(paragraphs, paragraph)
			else
				text = removeString(text, paragraph)
			end
		end
	end

	return paragraphs, text
end

-- Get the requested categories out of the given wikitext.
-- @param text Required. Wikitext to parse.
-- @param flags Range of categories to return, for example 2 or '1,3-5'. Omit to return all categories.
-- @return Sequence of strings containing the wikitext of the requested categories.
-- @return Original wikitext minus non-requested categories.
local function getCategories(text, flags)
	local categories = {}
	local flags, blacklist = parseFlags(flags)
	local categoryNamespaces = getNamespaces('Category')
	local name
	local count = 0
	for category in mw.ustring.gmatch(text, '%b[]') do
		if matchAny(category, '%[%[%s*', categoryNamespaces, '%s*:.*%]%]') then
			name = mw.ustring.match(category, '%[%[[^:]-:([^]|]+)')
			count = count + 1
			if not blacklist and ( not flags or flags[count] or matchFlag(name, flags) )
			or blacklist and flags and not flags[count] and not matchFlag(name, flags) then
				table.insert(categories, category)
			else
				text = removeString(text, category)
			end
		end
	end
	return categories, text
end

-- Get the requested references out of the given wikitext.
-- @param text Required. Wikitext to parse.
-- @param flags Range of references to return, for example 2 or '1,3-5'. Omit to return all references.
-- @return Sequence of strings containing the wikitext of the requested references.
-- @return Original wikitext minus non-requested references.
local function getReferences(text, flags)
	local references = {}
	local flags, blacklist = parseFlags(flags)
	local name
	local count = 0
	for reference in mw.ustring.gmatch(text, '<%s*[Rr][Ee][Ff][^>/]*>.-<%s*/%s*[Rr][Ee][Ff]%s*>') do
		name = mw.ustring.match(reference, '<%s*[Rr][Ee][Ff][^>]*name%s*=%s*["\']?([^"\'>/]+)["\']?[^>]*%s*>')
		count = count + 1
		if not blacklist and ( not flags or flags[count] or flags[name] )
		or blacklist and flags and not flags[count] and not flags[name] then
			table.insert(references, reference)
		else
			text = removeString(text, reference)
			if name then
				for citation in mw.ustring.gmatch(text, '<%s*[Rr][Ee][Ff][^>]*name%s*=%s*["\']?' .. name .. '["\']?[^/>]*/%s*>') do
					text = removeString(text, citation)
				end
			end
		end
	end
	return references, text
end

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

-- Get the wikitext of the requested sections
-- @param text Required. Wikitext to parse.
-- @param flags Range of sections to return, for example 2 or '1,3-5'. Omit to return all references.
-- @return Sequence of strings containing the wikitext of the requested sections.
-- @return Original wikitext minus non-requested sections.
local function getSections(text, flags)
	local sections = {}
	local flags, blacklist = parseFlags(flags)
	local count = 0
	local prefix, section, suffix
	for title in mw.ustring.gmatch('\n' .. text .. '\n==', '\n==+%s*([^=]+)%s*==+\n') do
		count = count + 1
		prefix, section, suffix = mw.ustring.match('\n' .. text .. '\n==', '\n()==+%s*' .. escapeString(title) .. '%s*==+(.-)()\n==')
		if not blacklist and ( not flags or flags[count] or matchFlag(title, flags) )
		or blacklist and flags and not flags[count] and not matchFlag(title, flags) then
			sections[title] = section
		else
			text = mw.ustring.sub(text, 1, prefix) .. mw.ustring.sub(text, suffix)
			text = mw.ustring.gsub(text, '\n?==$', '') -- remove the trailing \n==
		end
	end
	return sections, text
end

-- Get the requested section out of the given wikitext (including subsections).
-- @param text Required. Wikitext to parse.
-- @param section Required. Title of the section to get (in wikitext), for example 'History' or 'History of [[Athens]]'.
-- @return Wikitext of the requested section.
local function getSection(text, section)
	section = mw.text.trim(section)
	local escapedSection = escapeString(section)
	-- First check if the section title matches a <section> tag
	if mw.ustring.find(text, '<%s*[Ss]ection%s+begin%s*=%s*["\']?%s*' .. escapedSection .. '%s*["\']?%s*/>') then -- avoid expensive search if possible
		text = mw.ustring.gsub(text, '<%s*[Ss]ection%s+end=%s*["\']?%s*'.. escapedSection ..'%s*["\']?%s*/>.-<%s*[Ss]ection%s+begin%s*=%s*["\']?%s*' .. section .. '%s*["\']?%s*/>', '') -- remove text between onlyinclude sections
		text = mw.ustring.gsub(text, '^.-<%s*[Ss]ection%s+begin%s*=%s*["\']?%s*' .. escapedSection .. '%s*["\']?%s*/>', '') -- remove text before first onlyinclude section
		text = mw.ustring.gsub(text, '<%s*[Ss]ection%s+end=%s*["\']?%s*'.. escapedSection ..'%s*["\']?%s*/>.*', '') -- remove text after last onlyinclude section
		text = mw.text.trim(text)
		if text == '' then return throwError('section-tag-empty', section) end
		return text
	end
	local level, text = mw.ustring.match('\n' .. text .. '\n', '\n(==+)%s*' .. escapedSection .. '%s*==.-\n(.*)')
	if not text then return throwError('section-not-found', section) end
	local nextSection = '\n==' .. mw.ustring.rep('=?', #level - 2) .. '[^=].*'
	text = mw.ustring.gsub(text, nextSection, '') -- remove later sections with headings at this level or higher
	text = mw.text.trim(text)
	if text == '' then return throwError('section-empty', section) end
	return text
end

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

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

	-- Remove <noinclude> tags
	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

	-- Keep <onlyinclude> tags
	if mw.ustring.find(text, '[Oo][Nn][Ll][Yy][Ii][Nn][Cc][Ll][Uu][Dd][Ee]') then -- avoid expensive search if possible
		text = mw.ustring.gsub(text, '</[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

	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 fixReferences(text, page, full)
	if not full then full = getText(page) end
	local refNames = {}
	local refName
	local refBody
	local position = 1
	while position < mw.ustring.len(text) do
		refName, position = mw.ustring.match(text, '<%s*[Rr][Ee][Ff][^>]*name%s*=%s*["\']?([^"\'>]+)["\']?[^>]*/%s*>()', position)
		if refName then
			refName = mw.text.trim(refName)
			if not refNames[refName] then -- make sure we process each ref name only once
				table.insert(refNames, refName)
				refName = escapeString(refName)
				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]%s*group%s*=%s*["\']?[^"\'>/]+["\']%s*>', '<ref>')
	return text
end

-- Replace the bold title or synonym near the start of the page by a link to the page
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

-- Remove any self links
function removeSelfLinks( text )
	local lang = mw.language.getContentLanguage()
	local page = escapeString( mw.title.getCurrentTitle().prefixedText )
	text = mw.ustring.gsub( text, '%[%[(' .. lang:ucfirst( page ) .. ')%]%]', '%1' )
	text = mw.ustring.gsub( text, '%[%[(' .. lang:lcfirst( page ) .. ')%]%]', '%1' )
	text = mw.ustring.gsub( text, '%[%[' .. lang:ucfirst( page ) .. '|([^]]+)%]%]', '%1' )
	text = mw.ustring.gsub( text, '%[%[' .. lang:lcfirst( page ) .. '|([^]]+)%]%]', '%1' )
	return text
end

-- Main function for modules
local function get(page, options)
	if not options then options = {} end

	if not page then return throwError('no-page') end
	page = mw.text.trim(page)
	if page == '' then return throwError('no-page') end
	local page, hash, section = mw.ustring.match(page, '([^#]+)(#?)([^#]*)')
	local text, page = getText(page, options.noFollow)
	if not page then return throwError('no-page') end
	if not text then return throwError('page-not-found', page) end
	local full = text -- save the full text for fixReferences below

	-- Get the requested section
	if truthy(section) then
		text = getSection(text, section)
	elseif truthy(hash) then
		text = getLead(text)
	end
	
	-- Keep only the requested elements
	local only = parseFlags(options.only) or {}
	local elements = {}
	if options.sections or only.sections then
		elements.sections, text = getSections(text, options.sections)
	end
	if options.lists or only.lists then
		elements.lists, text = getLists(text, options.lists)
	end
	if options.files or only.files then
		elements.files, text = getFiles(text, options.files)
	end
	if options.tables or only.tables then
		elements.tables, text = getTables(text, options.tables)
	end
	if options.templates or only.templates then
		elements.templates, text = getTemplates(text, options.templates)
	end
	if options.parameters or only.parameters then
		elements.parameters, text = getParameters(text, options.parameters)
	end
	if options.paragraphs or only.paragraphs then
		elements.paragraphs, text = getParagraphs(text, options.paragraphs)
	end
	if options.categories or only.categories then
		elements.categories, text = getCategories(text, options.categories)
	end
	if options.references or only.references then
		elements.references, text = getReferences(text, options.references)
	end

	-- If 'only' is set, return the elements in the requested order
	if options.only then
		text = ''
		for element in mw.text.gsplit(options.only, ',') do
			element = elements[ mw.text.trim(element) ]
			if element then
				for key, value in pairs(element) do
					text = text .. '\n' .. value .. '\n'
				end
			end
		end
	end

	-- Misc options
	if truthy(options.fixReferences) then text = fixReferences(text, page, full) end
	if truthy(options.linkBold) then text = linkBold(text, page) end
	if truthy(options.noSelfLinks) then text = removeSelfLinks(text) end
	if truthy(options.noBold) then text = mw.ustring.gsub(text, "'''", '') end
	if truthy(options.noBehaviorSwitches) then text = mw.ustring.gsub(text, '__[A-Z]+__', '') end

	-- Remove multiple newlines left over from removing elements
	text = mw.ustring.gsub(text, '\n\n\n+', '\n\n')
	text = mw.text.trim(text)

	return text
end

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

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

-- Entry points for modules
function p.get(page, options) return get(page, options) end
function p.getText(page, noFollow) return getText(page, noFollow) end
function p.getLead(text) return getLead(text) end
function p.getSection(text, section) return getSection(text, section) end
function p.getSections(text, flags) return getSections(text, flags) end
function p.getParagraphs(text, flags) return getParagraphs(text, flags) end
function p.getParameters(text, flags) return getParameters(text, flags) end
function p.getCategories(text, flags) return getCategories(text, flags) end
function p.getReferences(text, flags) return getReferences(text, flags) end
function p.getTemplates(text, flags) return getTemplates(text, flags) end
function p.getTables(text, flags) return getTables(text, flags) end
function p.getLists(text, flags) return getLists(text, flags) end
function p.getFiles(text, flags) return getFiles(text, flags) end
function p.getError(message, value) return getError(message, value) end

-- Expose handy methods
function p.truthy(value) return truthy(value) end
function p.parseArgs(frame) return parseArgs(frame) end
function p.matchAny(text, pre, list, post, init) return matchAny(text, pre, list, post, init) end
function p.matchFlag(value, flags) return matchFlag(value, flags) end

return p