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A documentação para este módulo pode ser criada em Módulo: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 mFormatLink = require('Module:Format link')
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
}

--Searches display text only
local function searchDisp(haystack, needle)
    return mw.ustring.find(
            mw.ustring.sub(haystack, (string.find(haystack, '|') or 0) + 1), needle
    )
end

-- Stringifies a list generically; probably shouldn't be used directly
local 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 = mFormatLink.formatPages(
                {categorizeMissing = mHatnote.missingTargetCat}, list
        )
    end
    -- Set the separator; if any item contains it, use the alternate separator
    local separator = options.separator
    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 p.conjList (conj, list, fmt)
    return stringifyList(list, {conjunction = conj, formatted = fmt})
end

-- Stringifies lists with "and" or "or"
function p.andList (...) return p.conjList("and", ...) end
function p.orList (...) return p.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
local function punctuationCollapse (text)
    local replacements = {
        ["%.%.$"] = ".",
        ["%?%.$"] = "?",
        ["%!%.$"] = "!",
        ["%.%]%]%.$"] = ".]]",
        ["%?%]%]%.$"] = "?]]",
        ["%!%]%]%.$"] = "!]]"
    }
    for k, v in pairs(replacements) do text = mw.ustring.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
    -- If there is extra text, and no arguments are given, give nil value
    -- to not produce default of "For other uses, see foo (disambiguation)"
    if options.extratext and i > maxArg then return nil end
    -- 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", true)
    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 = {}
    if forSeeTable then
        for k, v in pairs(forSeeTable) do
            local useStr = v.use or options.otherText
            local pagesStr =
            p.andList(v.pages, true) or
                    mFormatLink._formatLink{
                        categorizeMissing = mHatnote.missingTargetCat,
                        link = mHatnote.disambiguate(options.title)
                    }
            local forSeeStr = mw.ustring.format(options.forSeeForm, useStr, pagesStr)
            forSeeStr = punctuationCollapse(forSeeStr)
            table.insert(strList, forSeeStr)
        end
    end
    if options.extratext then table.insert(strList, punctuationCollapse(options.extratext..'.')) 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
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