Mô đun:Navbox

require('strict')
local p = {}
local cfg = mw.loadData('Mô đun:Navbox/configuration')
local inArray = require("Mô đun:TableTools").inArray
local getArgs -- lazily initialized
local format = string.format

function p._navbox(args)
	local function striped(wikitext, border)
		-- Return wikitext with markers replaced for odd/even striping.
		-- Child (subgroup) navboxes are flagged with a category that is removed
		-- by parent navboxes. The result is that the category shows all pages
		-- where a child navbox is not contained in a parent navbox.
		local orphanCat = cfg.category.orphan
		if border == cfg.keyword.border_subgroup and args[cfg.arg.orphan] ~= cfg.keyword.orphan_yes then
			-- No change; striping occurs in outermost navbox.
			return wikitext .. orphanCat
		end
		local first, second = cfg.class.navbox_odd_part, cfg.class.navbox_even_part
		if args[cfg.arg.evenodd] then
			if args[cfg.arg.evenodd] == cfg.keyword.evenodd_swap then
				first, second = second, first
			else
				first = args[cfg.arg.evenodd]
				second = first
			end
		end
		local changer
		if first == second then
			changer = first
		else
			local index = 0
			changer = function (code)
				if code == '0' then
					-- Current occurrence is for a group before a nested table.
					-- Set it to first as a valid although pointless class.
					-- The next occurrence will be the first row after a title
					-- in a subgroup and will also be first.
					index = 0
					return first
				end
				index = index + 1
				return index % 2 == 1 and first or second
			end
		end
		local regex = orphanCat:gsub('([%[%]])', '%%%1')
		return (wikitext:gsub(regex, ''):gsub(cfg.marker.regex, changer)) -- () omits gsub count
	end
	
	local function processItem(item, nowrapitems)
		if item:sub(1, 2) == '{|' then
			-- Applying nowrap to lines in a table does not make sense.
			-- Add newlines to compensate for trim of x in |parm=x in a template.
			return '\n' .. item ..'\n'
		end
		if nowrapitems == cfg.keyword.nowrapitems_yes then
			local lines = {}
			for line in (item .. '\n'):gmatch('([^\n]*)\n') do
				local prefix, content = line:match('^([*:;#]+)%s*(.*)')
				if prefix and not content:match(cfg.pattern.nowrap) then
					line = format(cfg.nowrap_item, prefix, content)
				end
				table.insert(lines, line)
			end
			item = table.concat(lines, '\n')
		end
		if item:match('^[*:;#]') then
			return '\n' .. item ..'\n'
		end
		return item
	end
	
	local function has_navbar()
		return args[cfg.arg.navbar] ~= cfg.keyword.navbar_off
			and args[cfg.arg.navbar] ~= cfg.keyword.navbar_plain
			and (
				args[cfg.arg.name]
				or mw.getCurrentFrame():getParent():getTitle():gsub(cfg.pattern.sandbox, '')
					~= cfg.pattern.navbox
			)
	end
	
	-- extract text color from css, which is the only permitted inline CSS for the navbar
	local function extract_color(css_str)
		-- return nil because navbar takes its argument into mw.html which handles
		-- nil gracefully, removing the associated style attribute
		return mw.ustring.match(';' .. css_str .. ';', '.*;%s*([Cc][Oo][Ll][Oo][Rr]%s*:%s*.-)%s*;') or nil
	end
	
	local function renderNavBar(titleCell)
		if has_navbar() then
			local navbar = require('Mô đun:Navbar')._navbar
			titleCell:wikitext(navbar{
				[cfg.navbar.name] = args[cfg.arg.name],
				[cfg.navbar.mini] = 1,
				[cfg.navbar.fontstyle] = extract_color(
					(args[cfg.arg.basestyle] or '') .. ';' .. (args[cfg.arg.titlestyle] or '')
				)
			})
		end
	
	end
	
	local function renderTitleRow(tbl)
		if not args[cfg.arg.title] then return end
	
		local titleRow = tbl:tag('tr')
	
		local titleCell = titleRow:tag('th'):attr('scope', 'col')
	
		local titleColspan = 2
		if args[cfg.arg.imageleft] then titleColspan = titleColspan + 1 end
		if args[cfg.arg.image] then titleColspan = titleColspan + 1 end
	
		titleCell
			:cssText(args[cfg.arg.basestyle])
			:cssText(args[cfg.arg.titlestyle])
			:addClass(cfg.class.navbox_title)
			:attr('colspan', titleColspan)
	
		renderNavBar(titleCell)
	
		titleCell
			:tag('div')
				-- id for aria-labelledby attribute
				:attr('id', mw.uri.anchorEncode(args[cfg.arg.title]))
				:addClass(args[cfg.arg.titleclass])
				:css('font-size', '114%')
				:css('margin', '0 4em')
				:wikitext(processItem(args[cfg.arg.title]))
	end
	
	local function getAboveBelowColspan()
		local ret = 2
		if args[cfg.arg.imageleft] then ret = ret + 1 end
		if args[cfg.arg.image] then ret = ret + 1 end
		return ret
	end
	
	local function renderAboveRow(tbl)
		if not args[cfg.arg.above] then return end
	
		tbl:tag('tr')
			:tag('td')
				:addClass(cfg.class.navbox_abovebelow)
				:addClass(args[cfg.arg.aboveclass])
				:cssText(args[cfg.arg.basestyle])
				:cssText(args[cfg.arg.abovestyle])
				:attr('colspan', getAboveBelowColspan())
				:tag('div')
					-- id for aria-labelledby attribute, if no title
					:attr('id', (not args[cfg.arg.title]) and mw.uri.anchorEncode(args[cfg.arg.above]) or nil)
					:wikitext(processItem(args[cfg.arg.above], args[cfg.arg.nowrapitems]))
	end
	
	local function renderBelowRow(tbl)
		if not args[cfg.arg.below] then return end
	
		tbl:tag('tr')
			:tag('td')
				:addClass(cfg.class.navbox_abovebelow)
				:addClass(args[cfg.arg.belowclass])
				:cssText(args[cfg.arg.basestyle])
				:cssText(args[cfg.arg.belowstyle])
				:attr('colspan', getAboveBelowColspan())
				:tag('div')
					:wikitext(processItem(args[cfg.arg.below], args[cfg.arg.nowrapitems]))
	end
	
	local function renderListRow(tbl, index, listnum, listnums_size)
		local row = tbl:tag('tr')
	
		if index == 1 and args[cfg.arg.imageleft] then
			row
				:tag('td')
					:addClass(cfg.class.noviewer)
					:addClass(cfg.class.navbox_image)
					:addClass(args[cfg.arg.imageclass])
					:css('width', '1px')               -- Minimize width
					:css('padding', '0 2px 0 0')
					:cssText(args[cfg.arg.imageleftstyle])
					:attr('rowspan', listnums_size)
					:tag('div')
						:wikitext(processItem(args[cfg.arg.imageleft]))
		end
	
		local group_and_num = args[format(cfg.arg.group_and_num, listnum)] and format(cfg.arg.group_and_num, listnum) or format('nhóm%d', listnum)
		local groupstyle_and_num = format(cfg.arg.groupstyle_and_num, listnum)
		if args[group_and_num] then
			local groupCell = row:tag('th')
	
			-- id for aria-labelledby attribute, if lone group with no title or above
			if listnum == 1 and not (args[cfg.arg.title] or args[cfg.arg.above] or args[cfg.arg.group2]) then
				groupCell
					:attr('id', mw.uri.anchorEncode(args[cfg.arg.group1] or args["nhóm1"]))
			end
	
			groupCell
				:attr('scope', 'row')
				:addClass(cfg.class.navbox_group)
				:addClass(args[cfg.arg.groupclass])
				:cssText(args[cfg.arg.basestyle])
				-- If groupwidth not specified, minimize width
				:css('width', args[cfg.arg.groupwidth] or '1%')
	
			groupCell
				:cssText(args[cfg.arg.groupstyle])
				:cssText(args[groupstyle_and_num])
				:wikitext(args[group_and_num])
		end
	
		local listCell = row:tag('td')
	
		if args[group_and_num] then
			listCell
				:addClass(cfg.class.navbox_list_with_group)
		else
			listCell:attr('colspan', 2)
		end
	
		if not args[cfg.arg.groupwidth] then
			listCell:css('width', '100%')
		end
	
		local rowstyle  -- usually nil so cssText(rowstyle) usually adds nothing
		if index % 2 == 1 then
			rowstyle = args[cfg.arg.oddstyle]
		else
			rowstyle = args[cfg.arg.evenstyle]
		end
	
		local list_and_num = args[format(cfg.arg.list_and_num, listnum)] and format(cfg.arg.list_and_num, listnum) or format('dsach%d', listnum)
		local listText = args[list_and_num]
		
		if inArray(cfg.keyword.subgroups, listText) then
			local childArgs = {
				[cfg.arg.border] = cfg.keyword.border_subgroup,
				[cfg.arg.navbar] = cfg.keyword.navbar_plain
			}
			local hasChildArgs = false
			for k, v in pairs(args) do
				k = tostring(k)
				for _, w in ipairs(cfg.keyword.subgroups) do
					w = w .. listnum .. "_"
					if (#k > #w) and (k:sub(1, #w) == w) then
						childArgs[k:sub(#w + 1)] = v
						hasChildArgs = true
					end
				end
			end
			listText = hasChildArgs and p._navbox(childArgs) or listText
		end
		
		local oddEven = cfg.marker.oddeven
		if listText:sub(1, 12) == '</div><table' then
			-- Assume list text is for a subgroup navbox so no automatic striping for this row.
			oddEven = listText:find(cfg.pattern.navbox_title) and cfg.marker.restart or cfg.class.navbox_odd_part
		end
		
		local liststyle_and_num = format(cfg.arg.liststyle_and_num, listnum)
		local listclass_and_num = format(cfg.arg.listclass_and_num, listnum)
		listCell
			:css('padding', '0')
			:cssText(args[cfg.arg.liststyle])
			:cssText(rowstyle)
			:cssText(args[liststyle_and_num])
			:addClass(cfg.class.navbox_list)
			:addClass(cfg.class.navbox_part .. oddEven)
			:addClass(args[cfg.arg.listclass])
			:addClass(args[listclass_and_num])
			:tag('div')
				:css('padding',
					(index == 1 and args[cfg.arg.list1padding]) or args[cfg.arg.listpadding] or '0 0.25em'
				)
				:wikitext(processItem(listText, args[cfg.arg.nowrapitems]))
	
		if index == 1 and args[cfg.arg.image] then
			row
				:tag('td')
					:addClass(cfg.class.noviewer)
					:addClass(cfg.class.navbox_image)
					:addClass(args[cfg.arg.imageclass])
					:css('width', '1px')               -- Minimize width
					:css('padding', '0 0 0 2px')
					:cssText(args[cfg.arg.imagestyle])
					:attr('rowspan', listnums_size)
					:tag('div')
						:wikitext(processItem(args[cfg.arg.image]))
		end
	end
	
	local function has_list_class(htmlclass)
		local patterns = {
			'^' .. htmlclass .. '$',
			'%s' .. htmlclass .. '$',
			'^' .. htmlclass .. '%s',
			'%s' .. htmlclass .. '%s'
		}
		
		for arg, _ in pairs(args) do
			if type(arg) == 'string' and mw.ustring.find(arg, cfg.pattern.class) then
				for _, pattern in ipairs(patterns) do
					if mw.ustring.find(args[arg] or '', pattern) then
						return true
					end
				end
			end
		end
		return false
	end
	
	-- there are a lot of list classes in the wild, so we add their TemplateStyles
	local function add_list_styles()
		local frame = mw.getCurrentFrame()
		local function add_list_templatestyles(htmlclass, templatestyles)
			if has_list_class(htmlclass) then
				return frame:extensionTag{
					name = 'templatestyles', args = { src = templatestyles }
				}
			else
				return ''
			end
		end
		
		local hlist_styles = add_list_templatestyles('hlist', cfg.hlist_templatestyles)
		local plainlist_styles = add_list_templatestyles('plainlist', cfg.plainlist_templatestyles)
		
		-- a second workaround for [[phab:T303378]]
		-- when that issue is fixed, we can actually use has_navbar not to emit the
		-- tag here if we want
		if has_navbar() and hlist_styles == '' then
			hlist_styles = frame:extensionTag{
				name = 'templatestyles', args = { src = cfg.hlist_templatestyles }
			}
		end
		
		-- hlist -> plainlist is best-effort to preserve old Common.css ordering.
		-- this ordering is not a guarantee because most navboxes will emit only
		-- one of these classes [hlist_note]
		return hlist_styles .. plainlist_styles
	end
	
	local function needsHorizontalLists(border)
		if border == cfg.keyword.border_subgroup or args[cfg.arg.tracking] == cfg.keyword.tracking_no then
			return false
		end
		return not has_list_class(cfg.pattern.hlist) and not has_list_class(cfg.pattern.plainlist)
	end
	
	local function hasBackgroundColors()
		for _, key in ipairs({cfg.arg.titlestyle, cfg.arg.groupstyle,
			cfg.arg.basestyle, cfg.arg.abovestyle, cfg.arg.belowstyle}) do
			if tostring(args[key]):find('background', 1, true) then
				return true
			end
		end
		return false
	end
	
	local function hasBorders()
		for _, key in ipairs({cfg.arg.groupstyle, cfg.arg.basestyle,
			cfg.arg.abovestyle, cfg.arg.belowstyle}) do
			if tostring(args[key]):find('border', 1, true) then
				return true
			end
		end
		return false
	end
	
	local function isIllegible()
		local styleratio = require('Mô đun:Color contrast')._styleratio
		for key, style in pairs(args) do
			if tostring(key):match(cfg.pattern.style) then
				if styleratio{mw.text.unstripNoWiki(style)} < 4.5 then
					return true
				end
			end
		end
		return false
	end
	
	local function getTrackingCategories(border)
		local cats = {}
		if needsHorizontalLists(border) then table.insert(cats, cfg.category.horizontal_lists) end
		if hasBackgroundColors() then table.insert(cats, cfg.category.background_colors) end
		if isIllegible() then table.insert(cats, cfg.category.illegible) end
		if hasBorders() then table.insert(cats, cfg.category.borders) end
		return cats
	end
	
	local function renderTrackingCategories(builder, border)
		local title = mw.title.getCurrentTitle()
		if title.namespace ~= 10 then return end -- not in template space
		local subpage = title.subpageText
		if subpage == cfg.keyword.subpage_doc or subpage == cfg.keyword.subpage_sandbox
			or subpage == cfg.keyword.subpage_testcases then return end
	
		for _, cat in ipairs(getTrackingCategories(border)) do
			builder:wikitext('[[Thể loại:' .. cat .. ']]')
		end
	end
	
	local function renderMainTable(border, listnums)
		local tbl = mw.html.create('table')
			:addClass(cfg.class.nowraplinks)
			:addClass(args[cfg.arg.bodyclass])
	
		local state = args[cfg.arg.state]
		if args[cfg.arg.title] and state ~= cfg.keyword.state_plain and state ~= cfg.keyword.state_off then
			if state == cfg.keyword.state_collapsed then
				state = cfg.class.collapsed
			end
			tbl
				:addClass(cfg.class.collapsible)
				:addClass(state or cfg.class.autocollapse)
		end
	
		tbl:css('border-spacing', 0)
		if border == cfg.keyword.border_subgroup or border == cfg.keyword.border_none then
			tbl
				:addClass(cfg.class.navbox_subgroup)
				:cssText(args[cfg.arg.bodystyle])
				:cssText(args[cfg.arg.style])
		else  -- regular navbox - bodystyle and style will be applied to the wrapper table
			tbl
				:addClass(cfg.class.navbox_inner)
				:css('background', 'transparent')
				:css('color', 'inherit')
		end
		tbl:cssText(args[cfg.arg.innerstyle])
	
		renderTitleRow(tbl)
		renderAboveRow(tbl)
		local listnums_size = #listnums
		for i, listnum in ipairs(listnums) do
			renderListRow(tbl, i, listnum, listnums_size)
		end
		renderBelowRow(tbl)
	
		return tbl
	end
	
	local function add_navbox_styles(hiding_templatestyles)
		local frame = mw.getCurrentFrame()
		-- This is a lambda so that it doesn't need the frame as a parameter
		local function add_user_styles(templatestyles)
			if templatestyles and templatestyles ~= '' then
				return frame:extensionTag{
					name = 'templatestyles', args = { src = templatestyles }
				}
			end
			return ''
		end
	
		-- get templatestyles. load base from config so that Lua only needs to do
		-- the work once of parser tag expansion
		local base_templatestyles = cfg.templatestyles
		local templatestyles = add_user_styles(args[cfg.arg.templatestyles])
		local child_templatestyles = add_user_styles(args[cfg.arg.child_templatestyles])
	
		-- The 'navbox-styles' div exists to wrap the styles to work around T200206
		-- more elegantly. Instead of combinatorial rules, this ends up being linear
		-- number of CSS rules.
		return mw.html.create('div')
			:addClass(cfg.class.navbox_styles)
			:wikitext(
				add_list_styles() .. -- see [hlist_note] applied to 'before base_templatestyles'
				base_templatestyles ..
				templatestyles ..
				child_templatestyles ..
				table.concat(hiding_templatestyles)
			)
			:done()
	end
	
	-- work around [[phab:T303378]]
	-- for each arg: find all the templatestyles strip markers, insert them into a
	-- table. then remove all templatestyles markers from the arg
	local function move_hiding_templatestyles(args)
		local gfind = string.gfind
		local gsub = string.gsub
		local templatestyles_markers = {}
		local strip_marker_pattern = '(\127[^\127]*UNIQ%-%-templatestyles%-%x+%-QINU[^\127]*\127)'
		for k, arg in pairs(args) do
			for marker in gfind(arg, strip_marker_pattern) do
				table.insert(templatestyles_markers, marker)
			end
			args[k] = gsub(arg, strip_marker_pattern, '')
		end
		return templatestyles_markers
	end
	
	local hiding_templatestyles = move_hiding_templatestyles(args)
	local listnums = {}
	
	for k, _ in pairs(args) do
		if type(k) == 'string' then
			local listnum = k:match(cfg.pattern.listnum) or k:match('^dsach(%d+)$')
			if listnum then table.insert(listnums, tonumber(listnum)) end
		end
	end
	table.sort(listnums)

	local border = mw.text.trim(args[cfg.arg.border] or args[1] or '')
	if border == cfg.keyword.border_child then
		border = cfg.keyword.border_subgroup
	end

	-- render the main body of the navbox
	local tbl = renderMainTable(border, listnums)

	local res = mw.html.create()
	-- render the appropriate wrapper for the navbox, based on the border param

	if border == cfg.keyword.border_none then
		res:node(add_navbox_styles(hiding_templatestyles))
		local nav = res:tag('div')
			:attr('role', 'navigation')
			:node(tbl)
		-- aria-labelledby title, otherwise above, otherwise lone group
		if args[cfg.arg.title] or args[cfg.arg.above] or (args[cfg.arg.group1]
			and not args[cfg.arg.group2]) then
			nav:attr(
				'aria-labelledby',
				mw.uri.anchorEncode(
					args[cfg.arg.title] or args[cfg.arg.above] or args[cfg.arg.group1]
				)
			)
		else
			nav:attr('aria-label', cfg.aria_label)
		end
	elseif border == cfg.keyword.border_subgroup then
		-- We assume that this navbox is being rendered in a list cell of a
		-- parent navbox, and is therefore inside a div with padding:0em 0.25em.
		-- We start with a </div> to avoid the padding being applied, and at the
		-- end add a <div> to balance out the parent's </div>
		res
			:wikitext('</div>')
			:node(tbl)
			:wikitext('<div>')
	else
		res:node(add_navbox_styles(hiding_templatestyles))
		local nav = res:tag('div')
			:attr('role', 'navigation')
			:addClass(cfg.class.navbox)
			:addClass(args[cfg.arg.navboxclass])
			:cssText(args[cfg.arg.bodystyle])
			:cssText(args[cfg.arg.style])
			:css('padding', '3px')
			:node(tbl)
		-- aria-labelledby title, otherwise above, otherwise lone group
		if args[cfg.arg.title] or args[cfg.arg.above]
			or (args[cfg.arg.group1] and not args[cfg.arg.group2]) then
			nav:attr(
				'aria-labelledby',
				mw.uri.anchorEncode(args[cfg.arg.title] or args[cfg.arg.above] or args[cfg.arg.group1])
			)
		else
			nav:attr('aria-label', cfg.aria_label)
		end
	end

	if (args[cfg.arg.nocat] or cfg.keyword.nocat_false):lower() == cfg.keyword.nocat_false then
		renderTrackingCategories(res, border)
	end
	return striped(tostring(res), border)
end

function p.navbox(frame)
	local function readArgs(args, prefix)
		-- Read the arguments in the order they'll be output in, to make references
		-- number in the right order.
		local _
		_ = args[prefix .. cfg.arg.title] or args[prefix .. "tiêu đề"]
		_ = args[prefix .. cfg.arg.above] or args[prefix .. "trên"]
		-- Limit this to 20 as covering 'most' cases (that's a SWAG) and because
		-- iterator approach won't work here
		for i = 1, 20 do
			_ = args[prefix .. format(cfg.arg.group_and_num, i)] or args[prefix .. format('nhóm%d', i)]
			if inArray(cfg.keyword.subgroups, args[prefix .. format(cfg.arg.list_and_num, i)] or args[prefix .. format('dsach%d', i)]) then
				for _, v in ipairs(cfg.keyword.subgroups) do
					readArgs(args, prefix .. v .. i .. "_")
				end
			end
		end
		_ = args[prefix .. cfg.arg.below] or args[prefix .. "dưới"]
	end

	if not getArgs then
		getArgs = require('Mô đun:Arguments').getArgs
	end
	local args = getArgs(frame, {wrappers = {cfg.pattern.navbox}})
	
	args[cfg.arg.above] = args[cfg.arg.above] or args["trên"]
	args[cfg.arg.aboveclass] = args[cfg.arg.aboveclass] or args["lớp trên"]
	args[cfg.arg.abovestyle] = args[cfg.arg.abovestyle] or args["kiểu trên"]
	args[cfg.arg.basestyle] = args[cfg.arg.basestyle] or args["kiểu gốc"]
	args[cfg.arg.bodystyle] = args[cfg.arg.bodystyle] or args["kiểu thân"]
	args[cfg.arg.border] = args[cfg.arg.border] or args["khung"]
	args[cfg.arg.below] = args[cfg.arg.below] or args["dưới"]
	args[cfg.arg.belowclass] = args[cfg.arg.belowclass] or args["lớp dưới"]
	args[cfg.arg.belowstyle] = args[cfg.arg.belowstyle] or args["kiểu dưới"]
	args[cfg.arg.evenodd] = args[cfg.arg.evenodd] or args["chẵn lẻ"]
	args[cfg.arg.evenstyle] = args[cfg.arg.evenstyle] or args["kiểu chẵn"]
	args[cfg.arg.group1] = args[cfg.arg.group1] or args["nhóm1"]
	args[cfg.arg.group2] = args[cfg.arg.group2] or args["nhóm2"]
	args[cfg.arg.groupclass] = args[cfg.arg.groupclass] or args["lớp nhóm"]
	args[cfg.arg.groupstyle] = args[cfg.arg.groupstyle] or args["kiểu nhóm"]
	args[cfg.arg.groupwidth] = args[cfg.arg.groupwidth] or args["chiều rộng nhóm"]
	args[cfg.arg.innerstyle] = args[cfg.arg.innerstyle] or args["kiểu trong"]
	args[cfg.arg.image] = args[cfg.arg.image] or args["hình"]
	args[cfg.arg.imageleft] = args[cfg.arg.imageleft] or args["hình trái"]
	args[cfg.arg.imageleftstyle] = args[cfg.arg.imageleftstyle] or args["kiểu hình trái"]
	args[cfg.arg.imagestyle] = args[cfg.arg.imagestyle] or args["kiểu hình"]
	args[cfg.arg.liststyle] = args[cfg.arg.liststyle] or args["kiểu danh sách"]
	args[cfg.arg.name] = args[cfg.arg.name] or args["tên"]
	args[cfg.arg.navbar] = args[cfg.arg.navbar] or args["thanh chuyển hướng"]
	args[cfg.arg.oddstyle] = args[cfg.arg.oddstyle] or args["kiểu lẻ"]
	args[cfg.arg.state] = args[cfg.arg.state] or args["trạng thái"]
	args[cfg.arg.style] = args[cfg.arg.style] or args["kiểu"]
	args[cfg.arg.title] = args[cfg.arg.title] or args["tiêu đề"]
	args[cfg.arg.titleclass] = args[cfg.arg.titleclass] or args["lớp tiêu đề"]
	args[cfg.arg.titlestyle] = args[cfg.arg.titlestyle] or args["kiểu tiêu đề"]
	
	readArgs(args, "")
	return p._navbox(args)
end

return p