# Module:Section link

-- This module implements .
require('Module:No globals');  
local checkType = require('libraryUtil').checkType  
local p = {}  
local function makeSectionLink(page, section, display)
display = display or section
page = page or ''
return string.format('%s', page, section, display)
end  
local function normalizeTitle(title)
title = mw.ustring.gsub(mw.ustring.gsub(title, "'", ""), '"', '')
title = mw.ustring.gsub(title, "%b<>", "")
return mw.title.new(title).prefixedText
end  
function p._main(page, sections, options, title)
-- Validate input.
checkType('_main', 1, page, 'string', true)
checkType('_main', 3, options, 'table', true)
if sections == nil then
sections = {}
elseif type(sections) == 'string' then
sections = {sections}
elseif type(sections) ~= 'table' then
error(string.format(
"type error in argument #2 to '_main' " ..
"(string, table or nil expected, got %s)",
type(sections)
), 2)
end
options = options or {}
title = title or mw.title.getCurrentTitle  
-- Deal with blank page names elegantly
if page and not page:find('%S') then
page = nil
options.nopage = true
end  
-- Make the link(s).
local isShowingPage = not options.nopage
if #sections <= 1 then
local linkPage = page or ''
local section = sections[1] or 'Notes'
local display = '§&nbsp;' .. section
if isShowingPage then
page = page or title.prefixedText
if options.display and options.display ~= '' then
if normalizeTitle(options.display) == normalizeTitle(page) then
display = options.display .. ' ' .. display
else
error(string.format(
'Display title "%s" was ignored since it is ' ..
"not equivalent to the page's actual title",
options.display
), 0)
end
else
display = page .. ' ' .. display
end
end
return makeSectionLink(linkPage, section, display)
else
-- Multiple sections. First, make a list of the links to display.
local ret = {}
for i, section in ipairs(sections) do
ret[i] = makeSectionLink(page, section)
end  
-- Assemble the list of links into a string with mw.text.listToText.
-- We use the default separator for mw.text.listToText, but a custom
-- conjunction. There is also a special case conjunction if we only
-- have two links.
local conjunction
if #sections == 2 then
conjunction = '&#8203; and '
else
conjunction = ', and '
end
ret = mw.text.listToText(ret, nil, conjunction)  
-- Add the intro text.
local intro = '§§&nbsp;'
if isShowingPage then
intro = (page or title.prefixedText) .. ' ' .. intro
end
ret = intro .. ret  
return ret
end
end  
function p.main
local yesno = require('Module:Yesno')
local args = require('Module:Arguments').getArgs(, {
wrappers = 'Template:Section link',
valueFunc = function (key, value)
value = value:match('^%s*(.-)%s*$') -- Trim whitespace
-- Allow blank first parameters, as the wikitext template does this.
if value ~= '' or key == 1 then
return value
end
end
})  
for k, v in pairs(args) do -- replace underscores in the positional parameter values
if 'number' == type(k) and not yesno (args['keep-underscores']) then -- unless |keep-underscores=yes
args[k] = v:gsub ('_', ' ') -- do the replacement
end
end  
-- Sort the arguments.
local page
local sections, options = {}, {}
for k, v in pairs(args) do
if k == 1 then
-- Doing this in the loop because of a bug in Module:Arguments
-- when using pairs with deleted arguments.
page = mw.text.decode(v, true)
elseif type(k) == 'number' then
sections[k] = v
else
options[k] = v
end
end  
options.nopage = yesno (options.nopage); -- make boolean  
-- Extract section from page, if present
if page then
local p, s = page:match('^(.-)#(.*)$')
if p then page, sections[1] = p, s end
end  
-- Compress the sections array.
local function compressArray(t)
local nums, ret = {}, {}
for num in pairs(t) do
nums[#nums + 1] = num
end
table.sort(nums)
for i, num in ipairs(nums) do
ret[i] = t[num]
end
return ret
end
sections = compressArray(sections)  
return p._main(page, sections, options)
end  
return p