Module:Navplate

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Module:Navplate implements the {{navplate}} template.

---

--------------------------------------------------------------------------------
-- Module:Navplate                                                            --
-- This module implements {{Navplate}}                                        --
-- Based on Module:Infobox                                                    --
-- This is a work in progress                                                 --
--------------------------------------------------------------------------------

local p = {}
local args = {}
local origArgs = {}
local root

local function union(t1, t2)
    -- Returns the union of the values of two tables, as a sequence.
    local vals = {}
    for k, v in pairs(t1) do
        vals[v] = true
    end
    for k, v in pairs(t2) do
        vals[v] = true
    end
    local ret = {}
    for k, v in pairs(vals) do
        table.insert(ret, k)
    end
    return ret
end

local function addRow(rowArgs)
    -- Adds a row to the navplate, with either a header cell
    -- or a label/data cell combination.
    if rowArgs.header then
        root
            :tag('div')
                :addClass('template-navplate__groupheader')
                :wikitext(rowArgs.header)
    elseif rowArgs.data then
        local row = root:tag('div')
        row:addClass('template-navplate-item')
        row
            :tag('div')
            	:addClass('template-navplate-item__label')
                :wikitext(rowArgs.label)
                :done()
        
        local dataCell = row:tag('div')
        dataCell
            :addClass('template-navplate-item__list')
            :wikitext(rowArgs.data)
    end
end

local function renderRows()
    -- Gets the union of the header and data argument numbers,
    -- and renders them all in order using addRow.
    local rownums = union(getArgNums('header'), getArgNums('data'))
    table.sort(rownums)
    for k, num in ipairs(rownums) do
        addRow({
            header = args['header' .. tostring(num)],
            label = args['label' .. tostring(num)],
            data = args['data' .. tostring(num)]
        })
    end
end

-- If the argument exists and isn't blank, add it to the argument table.
-- Blank arguments are treated as nil to match the behaviour of ParserFunctions.
local function preprocessSingleArg(argName)
	if origArgs[argName] and origArgs[argName] ~= '' then
		args[argName] = origArgs[argName]
	end
end

-- Assign the parameters with the given prefixes to the args table, in order, in
-- batches of the step size specified. This is to prevent references etc. from
-- appearing in the wrong order. The prefixTable should be an array containing
-- tables, each of which has two possible fields, a "prefix" string and a
-- "depend" table. The function always parses parameters containing the "prefix"
-- string, but only parses parameters in the "depend" table if the prefix
-- parameter is present and non-blank.
local function preprocessArgs(prefixTable, step)
	if type(prefixTable) ~= 'table' then
		error("Non-table value detected for the prefix table", 2)
	end
	if type(step) ~= 'number' then
		error("Invalid step value detected", 2)
	end

	-- Get arguments without a number suffix, and check for bad input.
	for i,v in ipairs(prefixTable) do
		if type(v) ~= 'table' or type(v.prefix) ~= "string" or
			(v.depend and type(v.depend) ~= 'table') then
			error('Invalid input detected to preprocessArgs prefix table', 2)
		end
		preprocessSingleArg(v.prefix)
		-- Only parse the depend parameter if the prefix parameter is present
		-- and not blank.
		if args[v.prefix] and v.depend then
			for j, dependValue in ipairs(v.depend) do
				if type(dependValue) ~= 'string' then
					error('Invalid "depend" parameter value detected in preprocessArgs')
				end
				preprocessSingleArg(dependValue)
			end
		end
	end

	-- Get arguments with number suffixes.
	local a = 1 -- Counter variable.
	local moreArgumentsExist = true
	while moreArgumentsExist == true do
		moreArgumentsExist = false
		for i = a, a + step - 1 do
			for j,v in ipairs(prefixTable) do
				local prefixArgName = v.prefix .. tostring(i)
				if origArgs[prefixArgName] then
					-- Do another loop if any arguments are found, even blank ones.
					moreArgumentsExist = true
					preprocessSingleArg(prefixArgName)
				end
				-- Process the depend table if the prefix argument is present
				-- and not blank, or we are processing "prefix1" and "prefix" is
				-- present and not blank, and if the depend table is present.
				if v.depend and (args[prefixArgName] or (i == 1 and args[v.prefix])) then
					for j,dependValue in ipairs(v.depend) do
						local dependArgName = dependValue .. tostring(i)
						preprocessSingleArg(dependArgName)
					end
				end
			end
		end
		a = a + step
	end
end

local function parseDataParameters()
	preprocessArgs({
		{prefix = 'header'},
		{prefix = 'data', depend = {'label'}},
	}, 50)
end

local function _navplate()
    renderRows() 
    return tostring(root)
end

-- If called via #invoke, use the args passed into the invoking template.
-- Otherwise, for testing purposes, assume args are being passed directly in.
function p.navplate(frame)
    if frame == mw.getCurrentFrame() then
		origArgs = frame:getParent().args
	else
		origArgs = frame
	end
	
	parseDataParameters()
	
	return _navplate()
end

-- For calling via #invoke within a template
function p.navplateTemplate(frame)
	origArgs = {}
	for k,v in pairs(frame.args) do origArgs[k] = mw.text.trim(v) end
	
	parseDataParameters()

	return _navplate()
end
return p