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Module:Docbunto

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--- Docbunto is an automatic documentation generator for Scribunto modules.
--  The module is based on LuaDoc and LDoc. It produces documentation in
--  the form of MediaWiki markup, using `@tag`-prefixed comments embedded
--  in the source code of a Scribunto module. The taglet parser & doclet
--  renderer Docbunto uses are also publicly exposed to other modules.
--  
--  Docbunto code items are introduced by a block comment (`--[[]]--`), an
--  inline comment with three hyphens (`---`), or an inline `@tag` comment.
--  The module can use static code analysis to infer variable names, item
--  privacy (`local` keyword), tables (`{}` constructor) and functions
--  (`function` keyword). MediaWiki and Markdown formatting is supported.
--  
--  Items are usually rendered in the order they are defined, if they are
--  public items, or emulated classes extending the Lua primitives. There
--  are many customisation options available to change Docbunto behaviour.
--  
--  @module			 docbunto
--  @alias			  p
--  @require			Module:I18n
--  @require			Module:Lua_lexer
--  @require			Module:Unindent
--  @require			Module:Yesno
--  @require			Module:Arguments
--  @image			  Docbunto.svg
--  @author			 [[wikia:User:8nml|8nml]]
--  @attribution		[https://github.com/stevedonovan @stevedonovan] ([https://github.com/stevedonovan/LDoc GitHub])
--  @release			alpha
--  <nowiki>
local p = {}

--  Module dependencies.
local title = mw.title.getCurrentTitle()
local i18n = require("Module:I18n").loadMessages("Docbunto")
local references = mw.loadData('Module:Docbunto/references')
local lexer = require('Module:Lua Lexer')
local unindent = require('Module:Unindent')
local yesno = require('Module:Yesno')
local doc = require('Module:Documentation')
local modname

local DEFAULT_TITLE = title.namespace == 828 and doc.getEnvironment({}).templateTitle.text or ''
local frame, gsub, match

--------------------------------------------------------------------------------
-- Argument processing
--------------------------------------------------------------------------------
local function makeInvokeFunc(funcName)
	return function (f)
		local args = require("Module:Arguments").getArgs(f, {
			valueFunc = function (key, value)
				if type(value) == 'string' then
					value = value:match('^%s*(.-)%s*$') -- Remove whitespace.
					if key == 'heading' or value ~= '' then
						return value
					else
						return nil
					end
				else
					return value
				end
			end
		})
		return p[funcName](args)
	end
end

--  Docbunto variables & tag tokens.
local TAG_MULTI = 'M'
local TAG_ID = 'ID'
local TAG_SINGLE = 'S'
local TAG_TYPE = 'T'
local TAG_FLAG = 'N'
local TAG_MULTI_LINE = 'ML'

--  Docbunto processing patterns.
local DOCBUNTO_SUMMARY, DOCBUNTO_TYPE, DOCBUNTO_CONCAT
local DOCBUNTO_TAG, DOCBUNTO_TAG_VALUE, DOCBUNTO_TAG_MOD_VALUE

--  Docbunto private logic.

--- @{string.find} optimisation for @{string} functions.
--  Resets patterns for each documentation build.
--  @function		   strfind_wrap
--  @param			  {function} strfunc String library function.
--  @return			 {function} Function wrapped in @{string.find} check.
--  @local
function strfind_wrap(func)
	return function(...)
		local arg = {...}
		if string.find(arg[1], arg[2]) then
			return func(...);
		end
	end
end

--- Pattern configuration function.
--  Resets patterns for each documentation build.
--  @function		   configure_patterns
--  @param			  {table} options Configuration options.
--  @param			  {boolean} options.colon Colon mode.
--  @local
local function configure_patterns(options)
	-- Setup Unicode or ASCII character encoding (optimisation).
	gsub = strfind_wrap(
		options.unicode
			and mw.ustring.gsub
			or  string.gsub
	)
	match = strfind_wrap(
		options.unicode
			and mw.ustring.match
			or  string.match
	)
	DOCBUNTO_SUMMARY =
		options.iso639_th
			and '^[^ ]+'
			or
		options.unicode
			and '^[^.։。।෴۔።]+[.։。।෴۔።]?'
			or  '^[^.]+%.?'
	DOCBUNTO_CONCAT = ' '

	-- Setup parsing tag patterns with colon mode support.
	DOCBUNTO_TAG = options.colon and '^%s*(%w+):' or '^%s*@(%w+)'
	DOCBUNTO_TAG_VALUE = DOCBUNTO_TAG .. '(.*)'
	DOCBUNTO_TAG_MOD_VALUE = DOCBUNTO_TAG .. '%[([^%]]*)%](.*)'
	DOCBUNTO_TYPE = '^{({*[^}]+}*)}%s*'
end

--- Tag processor function.
--  @function		   process_tag
--  @param			  {string} str Tag string to process.
--  @return			 {table} Tag object.
--  @local
local function process_tag(str)
	local tag = {}

	if str:find(DOCBUNTO_TAG_MOD_VALUE) then
		tag.name, tag.modifiers, tag.value = str:match(DOCBUNTO_TAG_MOD_VALUE)
		local modifiers = {}

		for mod in tag.modifiers:gmatch('[^%s,]+') do
			modifiers[mod] = true
		end

		if modifiers.optchain then
			modifiers.opt = true
			modifiers.optchain = nil
		end

		tag.modifiers = modifiers

	else
		tag.name, tag.value = str:match(DOCBUNTO_TAG_VALUE)
	end

	tag.value = mw.text.trim(tag.value)

	if p.tags._type_alias[tag.name] then
		if p.tags._type_alias[tag.name] ~= 'variable' then
			tag.value = p.tags._type_alias[tag.name] .. ' ' .. tag.value
			tag.name = 'field'
		end

		if tag.value:match('^%S+') ~= '...' then
		   tag.value = tag.value:gsub('^(%S+)', '{%1}')
		end
	end

	tag.name = p.tags._alias[tag.name] or tag.name

	if tag.name ~= 'usage' and tag.value:find(DOCBUNTO_TYPE) then
		tag.type = tag.value:match(DOCBUNTO_TYPE)
		if tag.type:find('^%?') then
			tag.type = tag.type:sub(2) .. '|nil'
		end
		tag.value = tag.value:gsub(DOCBUNTO_TYPE, '')
	end

	if p.tags[tag.name] == TAG_FLAG then
		tag.value = true
	end

	return tag
end

--- Module info extraction utility.
--  @function		   extract_info
--  @param			  {table} documentation Package doclet info.
--  @return			 {table} Information name-value map.
--  @local
local function extract_info(documentation)
	local info = {}

	for _, tag in ipairs(documentation.tags) do
		if p.tags._module_info[tag.name] then
			if info[tag.name] then
				if not info[tag.name]:find('^%* ') then
					info[tag.name] = '* ' .. info[tag.name]
				end
				info[tag.name] = info[tag.name] .. '\n* ' .. tag.value

			else
				info[tag.name] = tag.value
			end
		end
	end

	return info
end

--- Type extraction utility.
--  @function		   extract_type
--  @param			  {table} item Item documentation data.
--  @return			 {string} Item type.
--  @local
local function extract_type(item)
	local item_type
	for _, tag in ipairs(item.tags) do
		if p.tags[tag.name] == TAG_TYPE then
			item_type = tag.name

			if tag.name == 'variable' then
				local implied_local = process_tag('@local')
				table.insert(item.tags, implied_local)
				item.tags['local'] = implied_local
			end

			if p.tags._generic_tags[item_type] and not p.tags._project_level[item_type] and tag.type then
				item_type = item_type .. i18n:msg('separator-colon') .. tag.type
			end
			break
		end
	end
	return item_type
end

--- Name extraction utility.
--  @function		   extract_name
--  @param			  {table} item Item documentation data.
--  @param			  {boolean} project Whether the item is project-level.
--  @return			 {string} Item name.
--  @local
local function extract_name(item, opts)
	opts = opts or {}
	local item_name
	for _, tag in ipairs(item.tags) do
		if p.tags[tag.name] == TAG_TYPE then
			item_name = tag.value; break;
		end
	end

	if item_name or not opts.project then
		return item_name
	end

	item_name = item.code:match('\nreturn%s+([%w_]+)')

	if item_name == 'p' and not item.tags['alias'] then
		local implied_alias = { name = 'alias', value = 'p' }
		item.tags['alias'] = implied_alias
		table.insert(item.tags, implied_alias)
	end

	item_name = (item_name and item_name ~= 'p')
		and item_name
		or  item.filename
				:gsub('^' .. mw.site.namespaces[828].name .. ':', '')
				:gsub('^(%u)', mw.ustring.lower)
				:gsub('/', '.'):gsub(' ', '_')

	return item_name
end

--- Source code utility for item name detection.
--  @function		   deduce_name
--  @param			  {string} tokens Stream tokens for first line.
--  @param			  {string} index Stream token index.
--  @param			  {table} opts Configuration options.
--  @param[opt]		 {boolean} opts.lookahead Whether a variable name succeeds the index.
--  @param[opt]		 {boolean} opts.lookbehind Whether a variable name precedes the index.
--  @return			 {string} Item name.
--  @local
local function deduce_name(tokens, index, opts)
	local name = ''

	if opts.lookbehind then
		for i2 = index, 1, -1 do
			if tokens[i2].type ~= 'keyword' then
				name = tokens[i2].data .. name
			else
				break
			end
		end

	elseif opts.lookahead then
		for i2 = index, #tokens do
			if tokens[i2].type ~= 'keyword' and not tokens[i2].data:find('^%(') then
				name = name .. tokens[i2].data
			else
				break
			end
		end
	end

	return name
end

--- Code analysis utility.
--  @function		   code_static_analysis
--  @param			  {table} item Item documentation data.
--  @local
local function code_static_analysis(item)
	local tokens = lexer(item.code:match('^[^\n]*'))[1]
	local t, i = tokens[1], 1
	local item_name, item_type

	while t do
		if t.type == 'whitespace' then
			table.remove(tokens, i)
		end

		t, i = tokens[i + 1], i + 1
	end
	t, i = tokens[1], 1

	while t do
		if t.data == '=' then
			item_name = deduce_name(tokens, i - 1, { lookbehind = true })
		end

		if t.data == 'function' then
			item_type = 'function'
			if tokens[i + 1].data ~= '(' then
				item_name = deduce_name(tokens, i + 1, { lookahead = true })
			end
		end

		if t.data == '{' or t.data == '{}' then
			item_type = 'table'
		end

		if t.data == 'local' and not (item.tags['private'] or item.tags['local'] or item.type == 'type') then
			local implied_local = process_tag('@local')
			table.insert(item.tags, implied_local)
			item.tags['local'] = implied_local
		end

		t, i = tokens[i + 1], i + 1
	end

	item.name = item.name or item_name or ''
	item.type = item.type or item_type
end

--- Array hash map conversion utility.
--  @function		   hash_map
--  @param			  {table} item Item documentation data array.
--  @return			 {table} Item documentation data map.
--  @local
local function hash_map(array)
	local map = array
	for _, element in ipairs(array) do
		if map[element.name] and not map[element.name].name then
			table.insert(map[element.name], mw.clone(element))
		elseif map[element.name] and map[element.name].name then
			map[element.name] = { map[element.name], mw.clone(element) }
		else
			map[element.name] = mw.clone(element)
		end
	end
	return map
end

--- Item export utility.
--  @function		   export_item
--  @param			  {table} documentation Package documentation data.
--  @param			  {string} item_reference Identifier name for item.
--  @param			  {string} item_index Identifier name for item.
--  @param			  {string} item_alias Export alias for item.
--  @param			  {boolean} factory_item Whether the documentation item is a factory function.
--  @local
local function export_item(documentation, item_reference, item_index, item_alias, factory_item)
	for _, item in ipairs(documentation.items) do
		if item_reference == item.name then
			item.tags['local'] = nil
			item.tags['private'] = nil

			for index, tag in ipairs(item.tags) do
				if p.tags._privacy_tags[tag.name] then
					table.remove(item.tags, index)
				end
			end

			item.type = item.type:gsub('variable', 'member')

			if factory_item then
				item.alias =
					documentation.items[item_index].tags['factory'].value ..
					(item_alias:find('^%[') and '' or (not item.tags['static'] and ':' or '.')) ..
					item_alias
			else

				item.alias =
					((documentation.tags['alias'] or {}).value or documentation.name) ..
					(item_alias:find('^%[') and '' or (documentation.type == 'classmod' and not item.tags['static'] and ':' or '.')) ..
					item_alias
			end

			item.hierarchy = mw.text.split((item.alias:gsub('["\']?%]', '')), '[.:%[\'""]+')
		end
	end
end

--- Subitem tag correction utility.
--  @function		   correct_subitem_tag
--  @param			  {table} item Item documentation data.
--  @local
local function correct_subitem_tag(item)
	local field_tag = item.tags['field']
	if item.type ~= 'function' or not field_tag then
		return
	end

	if field_tag.name then
		field_tag.name = 'param'
	else
		for _, tag_el in ipairs(field_tag) do
			tag_el.name = 'param'
		end
	end

	local param_tag = item.tags['param']
	if param_tag and not param_tag.name then
		if field_tag.name then
			table.insert(param_tag, field_tag)
		else
			for _, tag_el in ipairs(field_tag) do
				table.insert(param_tag, tag_el)
			end
		end

	elseif param_tag and param_tag.name then
		if field_tag.name then
			param_tag = { param_tag, field_tag }

		else
			for i, tag_el in ipairs(field_tag) do
				if i == 1  then
					param_tag = { param_tag }
				end
				for _, tag_el in ipairs(field_tag) do
					table.insert(param_tag, tag_el)
				end
			end
		end

	else
		param_tag = field_tag
	end

	item.tags['field'] = nil
end

--- Item override tag utility.
--  @function		   override_item_tag
--  @param			  {table} item Item documentation data.
--  @param			  {string} name Tag name.
--  @param[opt]		 {string} alias Target alias for tag.
--  @local
local function override_item_tag(item, name, alias)
	if item.tags[name] then
		item[alias or name] = item.tags[name].value
	end
end

--- Markdown header converter.
--  @function		   markdown_header
--  @param			  {string} hash Leading hash.
--  @param			  {string} text Header text.
--  @return			 {string} MediaWiki header.
--  @local
local function markdown_header(hash, text)
	local symbol = '='
	return
		'\n' .. symbol:rep(#hash) ..
		' ' .. text ..
		' ' .. symbol:rep(#hash) ..
		'\n'
end

--- Item reference formatting.
--  @function		   item_reference
--  @param			  {string} ref Item reference.
--  @return			 {string} Internal MediaWiki link to article item.
--  @local
local function item_reference(ref)
	local temp = mw.text.split(ref, '|')
	local item = temp[1]
	local text = temp[2] or temp[1]

	if references.items[item] then
		item = references.items[item]
	else
		item = '#' .. item
	end

	return '<code>' .. '[[' .. item .. '|' .. text .. ']]' .. '</code>'
end

--- Doclet type reference preprocessor.
--  Formats types with links to the [[mw:Extension:Scribunto/Lua reference manual|Lua reference manual]].
--  @function		   preop_type
--  @param			  {table} item Item documentation data.
--  @param			  {table} options Configuration options.
--  @local
local function type_reference(item, options)

	if
		not options.noluaref and
		item.value and
		item.value:match('^%S+') == '<code>...</code>'
	then
		item.value = item.value:gsub('^(%S+)', mw.text.tag{
			name = 'code',
			content = '[[mw:Extension:Scribunto/Lua reference manual#varargs|...]]'
		})
	end

	if not item.type then
		return
	end

	item.type = item.type:gsub('&#32;', '\26')
	local space_ptn = '[;|][%s\26]*'
	local types, t = mw.text.split(item.type, space_ptn)
	local spaces = {}
	for space in item.type:gmatch(space_ptn) do
		table.insert(spaces, space)
	end

	for index, type in ipairs(types) do
		t = types[index]
		local data = references.types[type]
		local name = data and data.name or t
		if not name:match('%.') and not name:match('^%u') and data then
			name = i18n:msg('type-' .. name)
		end
		if data and not options.noluaref then
			types[index] = '[[' .. data.link .. '|' .. name .. ']]'
		elseif
			not options.noluaref and
			not t:find('^line') and
			not p.tags._generic_tags[t]
		then
			types[index] = '[[#' .. t .. '|' .. name .. ']]'
		end
	end

	for index, space in ipairs(spaces) do
		types[index] = types[index] .. space
	end

	item.type = table.concat(types)
	if item.alias then
		mw.log(item.type)
	end
	item.type = item.type:gsub('\26', '&#32;')
end

--- Markdown preprocessor to MediaWiki format.
--  @function		   markdown
--  @param			  {string} str Unprocessed Markdown string.
--  @return			 {string} MediaWiki-compatible markup with HTML formatting.
--  @local
local function markdown(str)
	-- Bold & italic tags.
	str = str:gsub('%*%*%*([^\n*]+)%*%*%*', '<b><i>%1<i></b>')
	str = str:gsub('%*%*([^\n*]+)%*%*', '<b>%1</b>')
	str = str:gsub('%*([^\n*]+)%*', '<i>%1</i>')

	-- Self-closing header support.
	str = str:gsub('%f[^\n%z](#+) *([^\n#]+) *#+%s', markdown_header)

	-- External and internal links.
	str = str:gsub('%[([^\n%]]+)%]%(([^\n][^\n)]-)%)', '[%2 %1]')
	str = str:gsub('%@{([^\n}]+)}', item_reference)

	-- Programming & scientific notation.
	str = str:gsub('%f["`]`([^\n`]+)`%f[^"`]', '<code><nowiki>%1</nowiki></code>')
	str = str:gsub('%$%$\\ce{([^\n}]+)}%$%$', '<chem>%1</chem>')
	str = str:gsub('%$%$([^\n$]+)%$%$', '<math display="inline">%1</math>')

	-- Strikethroughs and superscripts.
	str = str:gsub('~~([^\n~]+)~~', '<del>%1</del>')
	str = str:gsub('%^%(([^)]+)%)', '<sup>%1</sup>')
	str = str:gsub('%^%s*([^%s%p]+)', '<sup>%1</sup>')

	-- HTML output.
	return str
end

--- Doclet item renderer.
--  @function		   render_item
--  @param			  {table} stream Wikitext documentation stream.
--  @param			  {table} item Item documentation data.
--  @param			  {table} options Configuration options.
--  @param[opt]		 {function} preop Item data preprocessor.
--  @local
local function render_item(stream, item, options, preop)
	local item_id = item.alias or item.name
	if preop then preop(item, options) end
	local item_name = item.alias or item.name

	type_reference(item, options)

	local item_type = item.type

	for _, name in ipairs(p.tags._subtype_hierarchy) do
		if item.tags[name] then
			item_type = item_type .. i18n:msg('separator-dot') .. name
		end
	end
	item_type = i18n:msg('parentheses', item_type)

	if options.strip and item.export and item.hierarchy then
		item_name = item_name:gsub('^[%w_]+[.[]?', '')
	end

	stream:wikitext(';<code id="' .. item_id .. '">' .. item_name .. '</code>' .. item_type):newline()

	if (#(item.summary or '') + #item.description) ~= 0 then
		local separator = #(item.summary or '') ~= 0 and #item.description ~= 0
			and (item.description:find('^[{:#*]+%s+') and '\n' or ' ')
			or  ''
		local intro = (item.summary or '') .. separator .. item.description
		stream:wikitext(':' .. intro:gsub('\n([{:#*])', '\n:%1'):gsub('\n\n([^=])', '\n:%1')):newline()
	end
end

--- Doclet tag renderer.
--  @function		   render_tag
--  @param			  {table} stream Wikitext documentation stream.
--  @param			  {string} name Item tag name.
--  @param			  {table} tag Item tag data.
--  @param			  {table} options Configuration options.
--  @param[opt]		 {function} preop Item data preprocessor.
--  @local
local function render_tag(stream, name, tag, options, preop)
	if preop then preop(tag, options) end
	if tag.value then
		type_reference(tag, options)
		local tag_name = i18n:msg('tag-' .. name, '1')
		stream:wikitext(':<b>' ..  tag_name .. '</b>' .. i18n:msg('separator-semicolon') .. mw.text.trim(tag.value):gsub('\n([{:#*])', '\n:%1'))

		if tag.value:find('\n[{:#*]') and (tag.type or (tag.modifiers or {})['opt']) then
			stream:newline():wikitext(':')
		end
		if tag.type and (tag.modifiers or {})['opt'] then
			stream:wikitext(i18n:msg{
				key = 'parentheses',
				args = {
					tag.type ..
					i18n:msg('separator-colon') ..
					i18n:msg('optional')
				}
			})

		elseif tag.type then
			stream:wikitext(i18n:msg{
				key = 'parentheses',
				args = { tag.type }
			})

		elseif (tag.modifiers or {})['opt'] then
			stream:wikitext(i18n:msg{
				key = 'parentheses',
				args = { i18n:msg('optional') }
			})
		end

		stream:newline()

	else
		local tag_name = i18n:msg('tag-' .. name, tostring(#tag))
		stream:wikitext(':<b>' .. tag_name .. '</b>' .. i18n:msg('separator-semicolon')):newline()

		for _, tag_el in ipairs(tag) do
			type_reference(tag_el, options)
			stream:wikitext(':' .. (options.ulist and '*' or ':') .. tag_el.value:gsub('\n([{:#*])', '\n:' .. (options.ulist and '*' or ':') .. '%1'))

			if tag_el.value:find('\n[{:#*]') and (tag_el.type or (tag_el.modifiers or {})['opt']) then
				stream:newline():wikitext(':' .. (options.ulist and '*' or ':') .. (tag_el.value:match('^[*:]+') or ''))
			end

			if tag_el.type and (tag_el.modifiers or {})['opt'] then
				stream:wikitext(i18n:msg{
					key = 'parentheses',
					args = {
						tag_el.type ..
						i18n:msg('separator-colon') ..
						i18n:msg('optional')
					}
				})

			elseif tag_el.type then
				stream:wikitext(i18n:msg{
					key = 'parentheses',
					args = { tag_el.type }
				})

			elseif (tag_el.modifiers or {})['opt'] then
				stream:wikitext(i18n:msg{
					key = 'parentheses',
					args = { i18n:msg('optional') }
				})
			end

			stream:newline()
		end
	end
end

--- Doclet function preprocessor.
--  Formats item name as a function call with top-level arguments.
--  @function		   preop_function_name
--  @param			  {table} item Item documentation data.
--  @param			  {table} options Configuration options.
--  @local
local function preop_function_name(item, options)
	local target = item.alias and 'alias' or 'name'

	item[target] = item[target] .. '('

	if
		item.tags['param'] and
		item.tags['param'].value and
		not item.tags['param'].value:find('^[%w_]+[.[]')
	then
		if (item.tags['param'].modifiers or {})['opt'] then
			item[target] = item[target] .. '<span style="opacity: 0.65;">'
		end

		item[target] = item[target] .. item.tags['param'].value:match('^(%S+)')

		if (item.tags['param'].modifiers or {})['opt'] then
			item[target] = item[target] .. '</span>'
		end

	elseif item.tags['param'] then
		for index, tag in ipairs(item.tags['param']) do
			if not tag.value:find('^[%w_]+[.[]') then
				if (tag.modifiers or {})['opt'] then
					item[target] = item[target] .. '<span style="opacity: 0.65;">'
				end

				item[target] = item[target] .. (index > 1 and ', ' or '') .. tag.value:match('^(%S+)')

				if (tag.modifiers or {})['opt'] then
					item[target] = item[target] .. '</span>'
				end
			end
		end
	end

	item[target] = item[target] .. ')'
end

--- Doclet parameter/field subitem preprocessor.
--  Indents and wraps variable prefix with `code` tag.
--  @function		   preop_variable_prefix
--  @param			  {table} item Item documentation data.
--  @param			  {table} options Configuration options.
--  @local
local function preop_variable_prefix(item, options)
	local indent_symbol = options.ulist and '*' or ':'
	local indent_level, indentation

	if item.value then
		indent_level = item.value:match('^%S+') == '...'
			and 0
			or  select(2, item.value:match('^%S+'):gsub('[.[]', ''))
		indentation = indent_symbol:rep(indent_level)
		item.value = indentation .. item.value:gsub('^(%S+)', '<code>%1</code>')

	elseif item then
		for _, item_el in ipairs(item) do
			preop_variable_prefix(item_el, options)
		end
	end
end

--- Doclet usage subitem preprocessor.
--  Formats usage example with `<syntaxhighlight>` tag.
--  @function		   preop_usage_highlight
--  @param			  {table} item Item documentation data.
--  @param			  {table} options Configuration options.
--  @local
local function preop_usage_highlight(item, options)
	if item.value then
		item.value = unindent(mw.text.trim(item.value))
		if item.value:find('^{{.+}}$') then
			item.value = item.value:gsub('=', mw.text.nowiki)
			local multi_line = item.value:find('\n') and '|m = 1|' or '|'

			if item.value:match('^{{([^:]+)') == '#invoke' then
				item.value = item.value:gsub('^{{[^:]+:', '{{t|i = 1' .. multi_line)

			else
				if options.entrypoint then
					item.value = item.value:gsub('^([^|]+)|%s*([^|}]-)(%s*)([|}])','%1|"%2"%3%4')
				end
				item.value = item.value:gsub('^{{', '{{t' .. multi_line)
			end

			local highlight_class = tonumber(mw.site.currentVersion:match('^%d%.%d+')) > 1.19
				and 'mw-highlight'
				or  'mw-geshi'

			if item.value:find('\n') then
				item.value = '<div class="'.. highlight_class .. ' mw-content-ltr" dir="ltr">' .. item.value .. '</div>'

			else
				item.value = '<span class="code">' .. item.value .. '</span>'
			end

		else
			item.value =
				'<syntaxhighlight lang="lua"'.. (item.value:find('\n') and '' or ' inline') ..'>' ..
					item.value ..
				'</syntaxhighlight>'
		end

	elseif item then
		for _, item_el in ipairs(item) do
			preop_usage_highlight(item_el, options)
		end
	end
end

--- Doclet error subitem preprocessor.
--  Formats line numbers (`{#}`) in error tag values.
--  @function		   preop_error_line
--  @param			  {table} item Item documentation data.
local function preop_error_line(item, options)
	if item.name then
		local line

		for mod in pairs(item.modifiers or {}) do
			if mod:find('^%d+$') then line = mod end
		end

		if line then
			if item.type then
				item.type = item.type .. i18n:msg('separator-colon') .. 'line ' .. line
			else
				item.type = 'line ' .. line
			end
		end

	elseif item then
		for _, item_el in ipairs(item) do
			preop_error_line(item_el, options)
		end
	end
end

--  Docbunto package items.

--- Entrypoint for the module in a format easier for other modules to call.
--  @function		   p._main
--  @param			  {table} args Module arguments.
--  @return			 {string} Module documentation output.
function p._main(args)
	frame = mw.getCurrentFrame()
	modname = args[1] or args.file or DEFAULT_TITLE
	if modname == '' then return '' end
	local options = {}
	options.all = yesno(args.all, false)
	options.autodoc = yesno(args.autodoc, false)
	options.boilerplate = yesno(args.boilerplate, false)
	options.caption = args.caption
	options.code = yesno(args.code, false)
	options.colon = yesno(args.colon, false)
	options.content = args.content
	options.image = args.image
	options.noluaref = yesno(args.noluaref, false)
	options.plain = yesno(args.plain, false)
	options.preface = args.preface
	options.simple = yesno(args.simple, false)
	options.sort = yesno(args.sort, false)
	options.strip = yesno(args.strip, false)
	options.ulist = yesno(args.ulist, false)

	return p.build(modname, options)
end

--- Entrypoint for the module.
--  @function		   p.main
--  @param			  {table} frame Module frame.
--  @return			 {string} Module documentation output.
p.main = makeInvokeFunc("_main")

--- Scribunto documentation generator entrypoint.
--  @function		   p.build
--  @param[opt]		 {string} modname Module page name (without namespace).
--					  Default: second-level subpage.
--  @param[opt]		 {table} options Configuration options.
--  @param[opt]		 {boolean} options.all Include local items in
--					  documentation.
--  @param[opt]		 {boolean} options.boilerplate Removal of
--					  boilerplate (license block comments).
--  @param[opt]		 {string} options.caption Infobox image caption.
--  @param[opt]		 {boolean} options.code Only document Docbunto code
--					  items - exclude article infobox and lede from
--					  rendered documentation. Permits article to be
--					  edited in VisualEditor.
--  @param[opt]		 {boolean} options.colon Format tags with a `:` suffix
--					  and without the `@` prefix. This bypasses the "doctag
--					  soup" some authors complain of.
--  @param[opt]		 {string} options.image Infobox image.
--  @param[opt]		 {boolean} options.noluaref Don't link to the [[mw:Extension:Scribunto/Lua
--					  reference manual|Lua reference manual]] for types.
--  @param[opt]		 {boolean} options.plain Disable Markdown formatting
--					  in documentation.
--  @param[opt]		 {string} options.preface Preface text to insert
--					  between lede & item documentation, used to provide
--					  usage and code examples.
--  @param[opt]		 {boolean} options.simple Limit documentation to
--					  descriptions only. Removes documentation of
--					  subitem tags such as `@param` and `@field` ([[#Item
--					  subtags|see list]]).
--  @param[opt]		 {boolean} options.sort Sort documentation items in
--					  alphabetical order.
--  @param[opt]		 {boolean} options.strip Remove table index in
--					  documentation.
--  @param[opt]		 {boolean} options.ulist Indent subitems as `<ul>`
--					  lists (LDoc/JSDoc behaviour).
function p.build(modname, options)
	modname = modname or DEFAULT_TITLE
	if modname == '' then return '' end
	options = options or {}

	local tagdata = p.taglet(modname, options)
	local docdata = p.doclet(tagdata, options)

	return docdata
end

--- Docbunto taglet parser for Scribunto modules.
--  @function		   p.taglet
--  @param[opt]		 {string} modname Module page name (without namespace).
--  @param[opt]		 {table} options Configuration options.
--  @error[938]		 {string} 'Lua source code not found in $1'
--  @error[944]		 {string} 'documentation markup for Docbunto not found in $1'
--  @return			 {table} Module documentation data.
function p.taglet(modname, options)
	modname = modname or DEFAULT_TITLE
	if modname == '' then return {} end
	options = options or {}

	local filepath = mw.site.namespaces[828].name .. ':' .. modname
	local content = mw.title.new(filepath):getContent()

	-- Content checks.
	if not content then
		content = options.content or error(i18n:msg('no-content', filepath))
	end
	if
		not content:match('%-%-%-') and
		not content:match(options.colon and '%s+%w+:' or '%s+@%w+')
	then
		error(i18n:msg('no-markup', filepath))
	end

	-- Remove leading escapes.
	content = content:gsub('^%-%-+%s*<[^>]+>\n', '')

	-- Remove closing pretty comments.
	content = content:gsub('\n%-%-%-%-%-+(\n[^-]+)', '\n-- %1')

	-- Remove boilerplate block comments.
	if options.boilerplate then
		content = content:gsub('^%-%-%[=*%[\n.-\n%-?%-?%]%=*]%-?%-?%s+', '')
		content = content:gsub('%s+%-%-%[=*%[\n.-\n%-?%-?%]%=*]%-?%-?$', '')
	end

	-- Configure patterns for colon mode and Unicode character encoding.
	options.unicode = type(content:find('[^%w%c%p%s]+')) == 'number'
	options.iso639_th = type(content:find('\224\184[\129-\155]')) == 'number'
	configure_patterns(options)

	-- Content lexing.
	local lines = lexer(content)
	local tokens = {}
	local dummy_token = {
		data = '',
		posFirst = 1,
		posLast = 1
	}
	local token_closure = 0
	for _, line in ipairs(lines) do
		if #line == 0 then
			dummy_token.type = token_closure == 0
				and 'whitespace'
				or  tokens[#tokens].type
			table.insert(tokens, mw.clone(dummy_token))
		else
			for _, token in ipairs(line) do
				 if token.data:find('^%[=*%[$') or token.data:find('^%-%-%[=*%[$') then
					token_closure = 1
				end
				if token.data:find(']=*]') then
					token_closure = 0
				end
				table.insert(tokens, token)
			end
		end
	end

	-- Start documentation data.
	local documentation = {}
	documentation.filename = filepath
	documentation.description = ''
	documentation.code = content
	documentation.comments = {}
	documentation.tags = {}
	documentation.items = {}
	local line_no = 0
	local item_index = 0

	-- Taglet tracking variables.
	local start_mode = true
	local comment_mode = false
	local doctag_mode = false
	local export_mode = false
	local special_tag = false
	local factory_mode = false
	local return_mode = false
	local comment_tail = ''
	local tag_name = ''
	local new_item = false
	local new_tag = false
	local new_item_code = false
	local code_block = false
	local pretty_comment = false
	local comment_brace = false

	local t, i = tokens[1], 1

	pcall(function()

	while t do
		-- Taglet variable update.
		new_item = t.data:find('^%-%-%-') or t.data:find('^%-%-%[%[$')
		comment_tail = t.data:gsub('^%-%-+', '')
		tag_name = comment_tail:match(DOCBUNTO_TAG)
		tag_name = p.tags._alias[tag_name] or tag_name
		new_tag = p.tags[tag_name]
		pretty_comment =
			t.data:find('^%-+$')		   or
			t.data:find('[^-]+%-%-+%s*$')  or
			t.data:find('</?nowiki>')	  or
			t.data:find('</?pre>')
		comment_brace =
			t.data:find('^%-%-%[%[$') or
			t.data:find('^%-%-%]%]$') or
			t.data:find('^%]%]%-%-$')
		pragma_mode = tag_name == 'pragma'
		export_mode = tag_name == 'export'
		special_tag = pragma_mode or export_mode
		local tags, subtokens, separator

		-- Line counter.
		if t.posFirst == 1 then
			line_no = line_no + 1
		end

		-- Data insertion logic.
		if t.type == 'comment' then
			if new_item then comment_mode = true end

			-- Module-level documentation taglet.
			if start_mode then
				table.insert(documentation.comments, t.data)

				if comment_mode and not new_tag and not doctag_mode and not comment_brace and not pretty_comment then
					separator = mw.text.trim(comment_tail):find('^[{|!}:#*=]+[%s-}]+')
						and '\n'
						or  (#documentation.description ~= 0 and DOCBUNTO_CONCAT or '')
					documentation.description = documentation.description .. separator .. mw.text.trim(comment_tail)
				end

				if new_tag and not special_tag then
					doctag_mode = true
					table.insert(documentation.tags, process_tag(comment_tail))

				elseif doctag_mode and not comment_brace and not pretty_comment then
					tags = documentation.tags
					if p.tags[tags[#tags].name] == TAG_MULTI then
						separator = mw.text.trim(comment_tail):find('^[{|!}:#*=]+[%s-}]+')
							and '\n'
							or  DOCBUNTO_CONCAT
						tags[#tags].value = tags[#tags].value .. separator .. mw.text.trim(comment_tail)
					elseif p.tags[tags[#tags].name] == TAG_MULTI_LINE then
						tags[#tags].value = tags[#tags].value .. '\n' .. comment_tail
					end
				end
			end

			-- Documentation item detection.
			if not start_mode and (new_item or (new_tag and tokens[i - 1].type ~= 'comment')) and not special_tag then
				table.insert(documentation.items, {})
				item_index = item_index + 1
				documentation.items[item_index].lineno = line_no
				documentation.items[item_index].code = ''
				documentation.items[item_index].comments = {}
				documentation.items[item_index].description = ''
				documentation.items[item_index].tags = {}
			end

			if not start_mode and comment_mode and not new_tag and not doctag_mode and not comment_brace and not pretty_comment then
				separator = mw.text.trim(comment_tail):find('^[{|!}:#*=]+[%s-}]+')
					and '\n'
					or  (#documentation.items[item_index].description ~= 0 and DOCBUNTO_CONCAT or '')
				documentation.items[item_index].description =
					documentation.items[item_index].description ..
					separator ..
					mw.text.trim(comment_tail)
			end

			if not start_mode and new_tag and not special_tag then
				doctag_mode = true
				table.insert(documentation.items[item_index].tags, process_tag(comment_tail))

			elseif not start_mode and doctag_mode and not comment_brace and not pretty_comment then
				tags = documentation.items[item_index].tags
				if p.tags[tags[#tags].name] == TAG_MULTI then
					separator = mw.text.trim(comment_tail):find('^[{|!}:#*=]+[%s-}]+')
						and '\n'
						or  DOCBUNTO_CONCAT
					tags[#tags].value = tags[#tags].value .. separator .. mw.text.trim(comment_tail)
				elseif p.tags[tags[#tags].name] == TAG_MULTI_LINE then
					tags[#tags].value = tags[#tags].value .. '\n' .. comment_tail
				end
			end

			if not start_mode and (comment_mode or doctag_mode) then
				table.insert(documentation.items[item_index].comments, t.data)
			end

			-- Export tag support.
			if export_mode then
				factory_mode = t.posFirst ~= 1
				if factory_mode then
					documentation.items[item_index].exports = true
				else
					documentation.exports = true
				end

				subtokens = {}
				while t and (not factory_mode or (factory_mode and t.data ~= 'end')) do
					if factory_mode then
						documentation.items[item_index].code =
							documentation.items[item_index].code ..
							(t.posFirst == 1 and '\n' or '') ..
							t.data
					end
					t, i = tokens[i + 1], i + 1
					if t and t.posFirst == 1 then
						line_no = line_no + 1
					end
					if t and t.type ~= 'whitespace' and t.type ~= 'keyword' and t.type ~= 'comment' then
						table.insert(subtokens, t)
					end
				end

				local separator = { [','] = true, [';'] = true }
				local brace = { ['{'] = true, ['}'] = true }

				local item_reference, item_alias = '', ''
				local sequence_index, has_key = 0, false
				local subtoken, index, terminating_index = subtokens[2], 2, #subtokens - 1

				while not brace[subtoken.data] do
					if subtoken.data == '=' then
						has_key = true
					elseif not separator[subtoken.data] then
						if has_key then
							item_reference = item_reference .. subtoken.data
						else
							item_alias = item_alias .. subtoken.data
						end
					elseif separator[subtoken.data] or index == terminating_index then
						if not has_key then
							increment = increment + 1
							item_reference, item_alias = item_alias, item_reference
							alias = '[' .. tostring(increment) .. ']'
						end
						export_item(documentation, item_reference, item_index, item_alias, factory_mode)
						item_reference, item_alias, has_key = '', '', false
					end
					subtoken, index = subtokens[index + 1], index + 1
				end

				if not factory_mode then
					break
				else
					factory_mode = false
				end
			end

			-- Pragma tag support.
			if pragma_mode then
				tags = process_tag(comment_tail)
				options[tags.value] = yesno((next(tags.modifiers or {})), true)
				if options[tags.value] == nil then
					options[tags.value] = true
				end
			end

		-- Data insertion logic.
		elseif comment_mode or doctag_mode then
			-- Package data post-processing.
			if start_mode then
				documentation.tags = hash_map(documentation.tags)
				documentation.name = extract_name(documentation, { project = true })
				documentation.info = extract_info(documentation)
				documentation.type = extract_type(documentation) or 'module'
				if #documentation.description ~= 0 then
					documentation.summary = match(documentation.description, DOCBUNTO_SUMMARY)
					documentation.description = gsub(documentation.description, DOCBUNTO_SUMMARY .. '%s*', '')
				end
				documentation.description = documentation.description:gsub('%s%s+', '\n\n')
				documentation.executable = p.tags._code_types[documentation.type] and true or false
				correct_subitem_tag(documentation)
				override_item_tag(documentation, 'name')
				override_item_tag(documentation, 'alias')
				override_item_tag(documentation, 'summary')
				override_item_tag(documentation, 'description')
				override_item_tag(documentation, 'class', 'type')
			end

			-- Item data post-processing.
			if item_index ~= 0 then
				documentation.items[item_index].tags = hash_map(documentation.items[item_index].tags)
				documentation.items[item_index].name = extract_name(documentation.items[item_index])
				documentation.items[item_index].type = extract_type(documentation.items[item_index])
				if #documentation.items[item_index].description ~= 0 then
					documentation.items[item_index].summary = match(documentation.items[item_index].description, DOCBUNTO_SUMMARY)
					documentation.items[item_index].description = gsub(documentation.items[item_index].description, DOCBUNTO_SUMMARY .. '%s*', '')
				end
				documentation.items[item_index].description = documentation.items[item_index].description:gsub('%s%s+', '\n\n')
				new_item_code = true
			end

			-- Documentation block reset.
			start_mode = false
			comment_mode = false
			doctag_mode = false
			export_mode = false
			pragma_mode = false
		end

		-- Don't concatenate module return value into item code.
		if t.data == 'return' and t.posFirst == 1 then
			return_mode = true
		end

		-- Item code concatenation.
		if item_index ~= 0 and not doctag_mode and not comment_mode and not return_mode then
			separator = #documentation.items[item_index].code ~= 0 and t.posFirst == 1 and '\n' or ''
			documentation.items[item_index].code = documentation.items[item_index].code .. separator .. t.data
			-- Code analysis on item head.
			if new_item_code and documentation.items[item_index].code:find('\n') then
				code_static_analysis(documentation.items[item_index])
				new_item_code = false
			end
		end

		t, i = tokens[i + 1], i + 1
	end

	documentation.lineno = line_no

	local package_name = (documentation.tags['alias'] or {}).value or documentation.name
	local package_alias = (documentation.tags['alias'] or {}).value or 'p'
	local export_ptn = '^%s([.[])'

	for _, item in ipairs(documentation.items) do
		if item.name == package_alias or (item.name and item.name:match('^' .. package_alias .. '[.[]')) then
			item.alias = item.name:gsub(export_ptn:format(package_alias), documentation.name .. '%1')
		end
		if
			item.name == package_name or
			(item.name and item.name:find(export_ptn:format(package_name))) or
			(item.alias and item.alias:find(export_ptn:format(package_name)))
		then
			item.export = true
		end
		if item.name and (item.name:find('[.:]') or item.name:find('%[[\'"]')) then
			item.hierarchy = mw.text.split((item.name:gsub('["\']?%]', '')), '[.:%[\'""]+')
		end
		item.type = item.type or ((item.alias or item.name or ''):find('[.[]') and 'member' or 'variable')
		correct_subitem_tag(item)
		override_item_tag(item, 'name')
		override_item_tag(item, 'alias')
		override_item_tag(item, 'summary')
		override_item_tag(item, 'description')
		override_item_tag(item, 'class', 'type')
	end

	-- Item sorting for documentation.
	table.sort(documentation.items, function(item1, item2)
		local inaccessible1 = item1.tags['local'] or item1.tags['private']
		local inaccessible2 = item2.tags['local'] or item2.tags['private']

		-- Send package items to the top.
		if item1.export and not item2.export then
			return true
		elseif item2.export and not item1.export then
			return false

		-- Send private items to the bottom.
		elseif inaccessible1 and not inaccessible2 then
			return false
		elseif inaccessible2 and not inaccessible1 then
			return true

		-- Optional alphabetical sort.
		elseif options.sort then
			return (item1.alias or item1.name) < (item2.alias or item2.name)

		-- Sort via source code order by default.
		else
			return item1.lineno < item2.lineno
		end
	end)

	end)

	return documentation
end

--- Doclet renderer for Docbunto taglet data.
--  @function		   p.doclet
--  @param			  {table} data Taglet documentation data.
--  @param[opt]		 {table} options Configuration options.
--  @return			 {string} Wikitext documentation output.
function p.doclet(data, options)
	local documentation = mw.html.create()
	local namespace = '^' .. mw.site.namespaces[828].name .. ':'
	local codepage = data.filename:gsub(namespace, '')

	options = options or {}
	frame = frame or mw.getCurrentFrame():getParent()

	local maybe_md = options.plain and tostring or markdown

	-- Detect Module:Entrypoint for usage formatting.
	options.entrypoint = data.code:find('require[ (]*["\'][MD]%w+:Entrypoint[\'"]%)?')

	-- Disable edit sections for automatic documentation pages.
	if not options.code then
		documentation:wikitext(frame:preprocess('__NOEDITSECTION__'))
	end

	-- Information
	if not options.code then
        local custom, infobox = pcall(require, 'Module:Docbunto/infobox')
        if custom and type(infobox) == 'function' then
            documentation:wikitext(infobox(data, codepage, frame, options, title, maybe_md)):newline()
        end
	end

	-- Documentation lede.
	if not options.code and (#(data.summary or '') + #data.description) ~= 0 then
		local separator = #data.summary ~= 0 and #data.description ~= 0
			and (data.description:find('^[{|!}:#*=]+[%s-}]+') and '\n\n' or ' ')
			or  ''
		local intro = (data.summary or '') .. separator .. data.description
		intro = frame:preprocess(maybe_md(intro:gsub('^(' .. codepage .. ')', '<b>%1</b>')))
		documentation:wikitext(intro):newline():newline()
	end

	-- Custom documentation preface.
	if options.preface then
		documentation:wikitext(options.preface):newline():newline()
	end

	-- Start code documentation.
	local codedoc = mw.html.create()
	local function_module = data.tags['param'] or data.tags['return']
	local header_type =
		documentation.type == 'classmod'
			and 'class'
		or  function_module
			and 'function'
			or  'items'
	if (function_module or #data.items ~= 0) and not options.code or options.preface then
		codedoc:wikitext('== ' .. i18n:msg('header-documentation') .. ' =='):newline()
	end
	if (function_module or #data.items ~= 0) then
		codedoc:wikitext('=== ' .. i18n:msg('header-' .. header_type) .. ' ==='):newline()
	end

	-- Function module support.
	if function_module then
		data.type = 'function'
		if not options.code then data.description = '' end
		render_item(codedoc, data, options, preop_function_name)

		if not options.simple and data.tags['param'] then
			render_tag(codedoc, 'param', data.tags['param'], options, preop_variable_prefix)
		end
		if not options.simple and data.tags['error'] then
			render_tag(codedoc, 'error', data.tags['error'], options, preop_error_line)
		end
		if not options.simple and data.tags['return'] then
			render_tag(codedoc, 'return', data.tags['return'], options)
		end
	end

	-- Render documentation items.
	local other_header = false
	local private_header = false
	local inaccessible
	for _, item in ipairs(data.items) do
		inaccessible = item.tags['local'] or item.tags['private']
		if not options.all and inaccessible then
			break
		end

		if
			not other_header and item.type ~= 'section' and item.type ~= 'type' and
			not item.export and not item.hierarchy and not inaccessible
		then
			codedoc:wikitext('=== ' .. i18n:msg('header-other') .. ' ==='):newline()
			other_header = true
		end
		if not private_header and options.all and inaccessible then
			codedoc:wikitext('=== ' .. i18n:msg('header-private') ..  '==='):newline()
			private_header = true
		end

		if item.type == 'section' then
			codedoc:wikitext('=== ' .. mw.ustring.gsub(item.summary or item.alias or item.name, '[.։。।෴۔።]$', '') .. ' ==='):newline()
			if #item.description ~= 0 then
				codedoc:wikitext(item.description):newline()
			end

		elseif item.type == 'type' then
			codedoc:wikitext('=== <code>' .. (item.alias or item.name) .. '</code> ==='):newline()
			if (#(item.summary or '') + #item.description) ~= 0 then
				local separator = #(item.summary or '') ~= 0 and #item.description ~= 0
					and (item.description:find('^[{:#*=]+[%s-}]+') and '\n\n' or ' ')
					or  ''
				codedoc:wikitext((item.summary or '') .. separator .. item.description):newline()
			end

		elseif item.type == 'function' then
			render_item(codedoc, item, options, preop_function_name)
			if not options.simple and item.tags['param'] then
				render_tag(codedoc, 'param', item.tags['param'], options, preop_variable_prefix)
			end
			if not options.simple and item.tags['error'] then
				render_tag(codedoc, 'error', item.tags['error'], options, preop_error_line)
			end
			if not options.simple and item.tags['return'] then
				render_tag(codedoc, 'return', item.tags['return'], options)
			end

		elseif
			item.type == 'table' or
			item.type ~= nil and (
				item.type:find('^member') or
				item.type:find('^variable')
			) and (item.alias or item.name)
		then
			render_item(codedoc, item, options)
			if not options.simple and item.tags['field'] then
				render_tag(codedoc, 'field', item.tags['field'], options, preop_variable_prefix)
			end
		end

		if item.type ~= 'section' and item.type ~= 'type' then
			if not options.simple and item.tags['note'] then
				render_tag(codedoc, 'note', item.tags['note'], options)
			end
			if not options.simple and item.tags['warning'] then
				render_tag(codedoc, 'warning', item.tags['warning'], options)
			end
			if not options.simple and item.tags['fixme'] then
				render_tag(codedoc, 'fixme', item.tags['fixme'], options)
			end
			if not options.simple and item.tags['todo'] then
				render_tag(codedoc, 'todo', item.tags['todo'], options)
			end
			if not options.simple and item.tags['usage'] then
				render_tag(codedoc, 'usage', item.tags['usage'], options, preop_usage_highlight)
			end
			if not options.simple and item.tags['see'] then
				render_tag(codedoc, 'see', item.tags['see'], options)
			end
		end
	end

	-- Render module-level annotations.
	local header_paren = options.code and '===' or '=='
	local header_text
	for _, tag_name in ipairs{'warning', 'fixme', 'note', 'todo', 'see'} do
		if data.tags[tag_name] then
			header_text =  i18n:msg('tag-' .. tag_name, data.tags[tag_name].value and '1' or '2')
			header_text = header_paren .. ' ' .. header_text .. ' ' .. header_paren
			codedoc:newline():wikitext(header_text):newline()
			if data.tags[tag_name].value then
				codedoc:wikitext(data.tags[tag_name].value):newline()
			else
				for _, tag_el in ipairs(data.tags[tag_name]) do
					codedoc:wikitext('* ' .. tag_el.value):newline()
				end
			end
		end
	end

	-- Add nowiki tags for EOF termination in tests.
	codedoc:tag('nowiki', { selfClosing = true })

	-- Code documentation formatting.
	codedoc = maybe_md(tostring(codedoc))
	codedoc = frame:preprocess(codedoc)

	documentation:wikitext(codedoc)
	documentation = tostring(documentation)
	return documentation
end

--- Token dictionary for Docbunto tags.
--  Maps Docbunto tag names to tag tokens.
--   * Multi-line tags use the `'M'` token.
--   * Multi-line preformatted tags use the `'ML'` token.
--   * Identifier tags use the `'ID'` token.
--   * Single-line tags use the `'S'` token.
--   * Flags use the `'N'` token.
--   * Type tags use the `'T'` token.
--  @table			  p.tags
p.tags = {
	-- Item-level tags, available for global use.
	['param'] = 'M', ['see'] = 'M', ['note'] = 'M', ['usage'] = 'ML',
	['description'] = 'M', ['field'] = 'M', ['return'] = 'M',
	['fixme'] = 'M', ['todo'] = 'M', ['warning'] = 'M', ['error'] = 'M';
	['class'] = 'ID', ['name'] = 'ID', ['alias'] = 'ID';
	['summary'] = 'S', ['pragma'] = 'S', ['factory'] = 'S',
	['release'] = 'S', ['author'] = 'S', ['copyright'] = 'S', ['license'] = 'S',
	['image'] = 'S', ['caption'] = 'S', ['require'] = 'S', ['attribution'] = 'S',
	['credit'] = 'S', ['demo'] = 'S';
	['local'] = 'N', ['export'] = 'N', ['private'] = 'N', ['constructor'] = 'N',
	['static'] = 'N';
	-- Project-level tags, all scoped to a file.
	['module'] = 'T', ['script'] = 'T', ['classmod'] = 'T', ['topic'] = 'T',
	['submodule'] = 'T', ['example'] = 'T', ['file'] = 'T';
	-- Module-level tags, used to register module items.
	['function'] = 'T', ['table'] = 'T', ['member'] = 'T', ['variable'] = 'T',
	['section'] = 'T', ['type'] = 'T';
}
p.tags._alias = {
	-- Normal aliases.
	['about']	   = 'summary',
	['abstract']	= 'summary',
	['brief']	   = 'summary',
	['bug']		 = 'fixme',
	['argument']	= 'param',
	['credits']	 = 'credit',
	['code']		= 'usage',
	['details']	 = 'description',
	['discussion']  = 'description',
	['exception']   = 'error',
	['lfunction']   = 'function',
	['package']	 = 'module',
	['property']	= 'member',
	['raise']	   = 'error',
	['requires']	= 'require',
	['returns']	 = 'return',
	['throws']	  = 'error',
	['typedef']	 = 'type',
	-- Typed aliases.
	['bool']		= 'field',
	['func']		= 'field',
	['int']		 = 'field',
	['number']	  = 'field',
	['string']	  = 'field',
	['tab']		 = 'field',
	['vararg']	  = 'param',
	['tfield']	  = 'field',
	['tparam']	  = 'param',
	['treturn']	 = 'return'
}
p.tags._type_alias = {
	-- Implicit type value alias.
	['bool']		= 'boolean',
	['func']		= 'function',
	['int']		 = 'number',
	['number']	  = 'number',
	['string']	  = 'string',
	['tab']		 = 'table',
	['vararg']	  = '...',
	-- Pure typed modifier alias.
	['tfield']	  = 'variable',
	['tparam']	  = 'variable',
	['treturn']	 = 'variable'
}
p.tags._project_level = {
	-- Contains code.
	['module']	  = true,
	['script']	  = true,
	['classmod']	= true,
	['submodule']   = true,
	['file']		= true,
	-- Contains documentation.
	['topic']	   = true,
	['example']	 = true
}
p.tags._code_types = {
	['module']	  = true,
	['script']	  = true,
	['classmod']	= true
}
p.tags._module_info = {
	['image']	   = true,
	['caption']	 = true,
	['release']	 = true,
	['author']	  = true,
	['copyright']   = true,
	['license']	 = true,
	['require']	 = true,
	['credit']	  = true,
	['attribution'] = true,
	['demo']		= true
}
p.tags._annotation_tags = {
	['warning']	 = true,
	['fixme']	   = true,
	['note']		= true,
	['todo']		= true,
	['see']		 = true
}
p.tags._privacy_tags = {
	['private']	 = true,
	['local']	   = true
}
p.tags._generic_tags = {
	['variable']	= true,
	['member']	  = true
}
p.tags._subtype_tags = {
	['factory']	 = true,
	['local']	   = true,
	['private']	 = true,
	['constructor'] = true,
	['static']	  = true
}
p.tags._subtype_hierarchy = {
	'private',
	'local',
	'static',
	'factory',
	'constructor'
}

return p
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