Module:Hatnote list

Revision as of 18:47, 11 October 2016 by Matt Pijoan (talk | contribs) (1 revision imported)
Jump to navigation Jump to search
The printable version is no longer supported and may have rendering errors. Please update your browser bookmarks and please use the default browser print function instead.

Documentation for this module may be created at Module:Hatnote list/doc

--------------------------------------------------------------------------------
--                           Module:Hatnote list                              --
--                                                                            --
-- This module produces and formats lists for use in hatnotes. In particular, --
-- it implements the for-see list, i.e. lists of "For X, see Y" statements,   --
-- as used in {{about}}, {{redirect}}, and their variants. Also introduced    --
-- are andList & orList helpers for formatting lists with those conjunctions. --
--------------------------------------------------------------------------------

local mArguments --initialize lazily
local mHatnote = require('Module:Hatnote')
local libraryUtil = require('libraryUtil')
local checkType = libraryUtil.checkType
local p = {}

--------------------------------------------------------------------------------
-- List stringification helper functions
--
-- These functions are used for stringifying lists, usually page lists inside
-- the "Y" portion of "For X, see Y" for-see items.
--------------------------------------------------------------------------------

--default options table used across the list stringification functions
local stringifyListDefaultOptions = {
	conjunction = "and",
	separator = ",",
	altSeparator = ";",
	space = " ",
	formatted = false
}

-- Stringifies a list generically; probably shouldn't be used directly
function stringifyList(list, options)
	-- Type-checks, defaults, and a shortcut
	checkType("stringifyList", 1, list, "table")
	if #list == 0 then return nil end
	checkType("stringifyList", 2, options, "table", true)
	options = options or {}
	for k, v in pairs(stringifyListDefaultOptions) do
		if options[k] == nil then options[k] = v end
	end
	local s = options.space
	-- Format the list if requested
	if options.formatted then list = mHatnote.formatPages(unpack(list)) end
	-- Set the separator; if any item contains it, use the alternate separator
	local separator = options.separator
	--searches display text only
	function searchDisp(t, f)
		return string.find(string.sub(t, (string.find(t, '|') or 0) + 1), f)
	end
	for k, v in pairs(list) do
		if searchDisp(v, separator) then
			separator = options.altSeparator
			break
		end
	end
	-- Set the conjunction, apply Oxford comma, and force a comma if #1 has "§"
	local conjunction = s .. options.conjunction .. s
	if #list == 2 and searchDisp(list[1], "§") or #list > 2 then
		conjunction = separator .. conjunction
	end
	-- Return the formatted string
	return mw.text.listToText(list, separator .. s, conjunction)
end

--DRY function
function conjList (conj, list, fmt)
	return stringifyList(list, {conjunction = conj, formatted = fmt})
end

-- Stringifies lists with "and" or "or"
function p.andList (...) return conjList("and", ...) end
function p.orList (...) return conjList("or", ...) end

--------------------------------------------------------------------------------
-- For see
--
-- Makes a "For X, see [[Y]]." list from raw parameters. Intended for the
-- {{about}} and {{redirect}} templates and their variants.
--------------------------------------------------------------------------------

--default options table used across the forSee family of functions
local forSeeDefaultOptions = {
	andKeyword = 'and',
	title = mw.title.getCurrentTitle().text,
	otherText = 'other uses',
	forSeeForm = 'For %s, see %s.'
}

--Collapses duplicate punctuation
function punctuationCollapse (text)
	local replacements = {
		["%.%.$"] = ".",
		["%?%.$"] = "?",
		["%!%.$"] = "!",
		["%.%]%]%.$"] = ".]]",
		["%?%]%]%.$"] = "?]]",
		["%!%]%]%.$"] = "!]]"
	}
	for k, v in pairs(replacements) do text = string.gsub(text, k, v) end
	return text
end

-- Structures arguments into a table for stringification, & options
function p.forSeeArgsToTable (args, from, options)
	-- Type-checks and defaults
	checkType("forSeeArgsToTable", 1, args, 'table')
	checkType("forSeeArgsToTable", 2, from, 'number', true)
	from = from or 1
	checkType("forSeeArgsToTable", 3, options, 'table', true)
	options = options or {}
	for k, v in pairs(forSeeDefaultOptions) do
		if options[k] == nil then options[k] = v end
	end
	-- maxArg's gotten manually because getArgs() and table.maxn aren't friends
	local maxArg = 0
	for k, v in pairs(args) do
		if type(k) == 'number' and k > maxArg then maxArg = k end
	end
	-- Structure the data out from the parameter list:
	-- * forTable is the wrapper table, with forRow rows
	-- * Rows are tables of a "use" string & a "pages" table of pagename strings
	-- * Blanks are left empty for defaulting elsewhere, but can terminate list
	local forTable = {}
	local i = from
	local terminated = false
	-- Loop to generate rows
	repeat
		-- New empty row
		local forRow = {}
		-- On blank use, assume list's ended & break at end of this loop
		forRow.use = args[i]
		if not args[i] then terminated = true end
		-- New empty list of pages
		forRow.pages = {}
		-- Insert first pages item if present
		table.insert(forRow.pages, args[i + 1])
		-- If the param after next is "and", do inner loop to collect params
		-- until the "and"'s stop. Blanks are ignored: "1|and||and|3" → {1, 3}
		while args[i + 2] == options.andKeyword do
			if args[i + 3] then 
				table.insert(forRow.pages, args[i + 3])
			end
			-- Increment to next "and"
			i = i + 2
		end
		-- Increment to next use
		i = i + 2
		-- Append the row
		table.insert(forTable, forRow)
	until terminated or i > maxArg
	
	return forTable
end

-- Stringifies a table as formatted by forSeeArgsToTable
function p.forSeeTableToString (forSeeTable, options)
	-- Type-checks and defaults
	checkType("forSeeTableToString", 1, forSeeTable, "table")
	checkType("forSeeTableToString", 2, options, "table", true)
	options = options or {}
	for k, v in pairs(forSeeDefaultOptions) do
		if options[k] == nil then options[k] = v end
	end
	-- Stringify each for-see item into a list
	local strList = {}
	for k, v in pairs(forSeeTable) do
		local useStr = v.use or options.otherText
		local pagesStr = p.andList(v.pages, true) or
			mHatnote._formatLink(mHatnote.disambiguate(options.title))
		local forSeeStr = string.format(options.forSeeForm, useStr, pagesStr)
		forSeeStr = punctuationCollapse(forSeeStr)
		table.insert(strList, forSeeStr)
	end
	-- Return the concatenated list
	return table.concat(strList, ' ')
end

-- Produces a "For X, see [[Y]]" string from arguments. Expects index gaps
-- but not blank/whitespace values. Ignores named args and args < "from".
function p._forSee (args, from, options)
	local forSeeTable = p.forSeeArgsToTable(args, from, options)
	return p.forSeeTableToString(forSeeTable, options)
end

-- As _forSee, but uses the frame.
function p.forSee (frame, from, options)
	mArguments = require('Module:Arguments')
	return p._forSee(mArguments.getArgs(frame), from, options)
end

return p