وحدة:Convert/show

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This module can be used to prepare tables of wikitext to display simple documentation for specified units. Data is obtained by calling Module:Convert. In addition, the module can be used to show {{حول}} usage examples.

Displaying unit information[عدل]

The module contains a built-in list of commonly used units. The information at Help:Convert units#Units is the output from:

  • {{#invoke:convert/show|units}}

When no units are specified, the full built-in list of unit codes is used. In addition, the headings and examples defined in the module are displayed.

Units may be specified by entering section names or individual unit codes. No headings or examples are included if units are specified.

For example, one or more sections from the full list can be displayed as in the following examples:

  • {{#invoke:convert/show|units|length}}
  • {{#invoke:convert/show|units|length|mass|area}}

Any "input" unit codes can be specified individually, for example, the following line:

  • {{#invoke:convert/show|units|um|cm|ug|kg}}

gives the result:

شفرة الوحدة رمز الوحدة إسم الوحدة تسمية US إن كانت مختلفة
um مكـم ميكرومتر
cm سـم سنتيمتر
ug مكـغ ميكروغرام
kg كـغ كيلوغرام

Only units suitable for use as a conversion input can be used. For example, ftin cannot be used as it is an output unit which displays the result in feet and inches.

Displaying usage examples[عدل]

The module can display examples of نص صغير{{حول}} usage in a list or a table. The required parameters must be separated with ! (exclamation mark) rather than the normal | (pipe), and a parameter that includes an equals sign must be prefixed with 1= (for the first parameter), or 2= (for the second), etc.

For example, the following line:

  • {{#invoke:convert/show|list|1=123!cm!in!abbr=on|2=125!sqft!m2!abbr=off!sp=us}}

gives the result:

  • {{convert|123|cm|in|abbr=on}} ينتج ← نص غير منسق123 سـم (48 بوصة)
  • {{convert|125|sqft|m2|abbr=off|sp=us}} ينتج ← نص غير منسق125 قدم مربع (11.6 متر مربع)

The same information can be displayed in a table.

  • {{#invoke:convert/show|table|1=123!cm!in!abbr=on|2=125!sqft!m2!abbr=off!sp=us}}

gives the result:

{{convert|123|cm|in|abbr=on}} ينتج ← نص غير منسق123 سـم (48 بوصة)
{{convert|125|sqft|m2|abbr=off|sp=us}} ينتج ← نص غير منسق125 قدم مربع (11.6 متر مربع)

Substitution[عدل]

Results from invoking the module can be substituted into the current page, for example:

  • {{subst:#invoke:convert/show|units|length}}
  • {{subst:#invoke:convert/show|table|1=123!cm!in!abbr=on|2=125!sqft!m2!abbr=off!sp=us}}

Substitution may be useful if editing of the resulting wikitext is required. 

-- Prepare tables of wikitext to display simple documentation about
-- specified units. Data is obtained by calling Module:Convert.
-- Also provides a function to show convert usage examples.

local function collection()
	-- Return a table to hold items.
	return {
		n = 0,
		add = function (self, item)
			self.n = self.n + 1
			self[self.n] = item
		end,
		join = function (self, sep)
			return table.concat(self, sep)
		end,
	}
end

local function strip(text)
	-- Return text with no leading/trailing whitespace.
	return text:match("^%s*(.-)%s*$")
end

local function frame(self_args, parent_args)
	-- Simulate enough of a MediaWiki module frame for convert.
	return {
		args = self_args,
		parent = parent_args and frame(parent_args, nil),
		getParent = function (self) return self.parent end,
	}
end

local cvt_function
local function call_convert(args)
	if not cvt_function then
		-- A testing program can set the global variable 'is_test_run'.
		cvt_function = require(is_test_run and 'convert' or 'Module:Convert').convert
	end
	return cvt_function(frame({}, args))
end

local function maketable(results, units)
	results:add('{| class="wikitable"')
	results:add('! شفرة الوحدة !! رمز الوحدة !! إسم الوحدة !! تسمية US إن كانت مختلفة ')
	for i, ucode in ipairs(units) do
		local row = collection()
		row:add(ucode)
		local args = { '1', ucode, abbr = 'on', disp = 'unit' }
		row:add(call_convert(args))
		args.abbr = 'off'
		local name1 = call_convert(args)
		row:add(name1)
		args.sp = 'us'
		local name1_us = call_convert(args)
		if name1_us == name1 then
			row:add('')
		else
			row:add(name1_us)
		end
		results:add('|-')
		results:add(strip('| ' .. row:join(' || ')))
	end
	results:add('|}')
	results:add('')
end

-- Commonly used units for main documentation.
-- Can only be input units (not combinations or multiples).
local common_units = {
	["Area"] = {
		heading = "مساحة",
		examples = { "1.5|sqmi|km2", "1.5|sqmi|km2|abbr=off", "1.5|sqmi|km2|abbr=on" },
		"acre",
		"ha",
		"m2",
		"cm2",
		"km2",
		"sqin",
		"sqft",
		"sqyd",
		"sqmi",
	},
	["Fuel efficiency"] = {
		heading = "كفاءة الوقود",
		examples = { "12|mpgus|km/L", "12|mpgus|km/L|abbr=off", "12|mpgus|km/L|abbr=off|sp=us", "12|mpgus|km/L|abbr=on" },
		"km/L",
		"mpgimp",
		"mpgus",
		"L/km",
		"L/100 km",
	},
	["Length"] = {
		heading = "طول",
		examples = { "123|cm|in", "123|cm|in|abbr=off|sp=us", "123|cm|in|abbr=on" },
		"uin",
		"in",
		"ft",
		"yd",
		"mi",
		"nmi",
		"m",
		"cm",
		"mm",
		"km",
		"angstrom",
	},
	["Mass"] = {
		heading = "كتلة",
		examples = { "72.3|kg|lb", "72.3|kg|lb|abbr=off", "72.3|kg|lb|abbr=on" },
		"g",
		"kg",
		"oz",
		"lb",
		"st",
		"LT",
		"MT",
		"ST",
	},
	["Pressure"] = {
		heading = "ضغط",
		examples = { "28|psi|Pa", "28|psi|Pa|abbr=off", "28|psi|Pa|abbr=on" },
		"atm",
		"mbar",
		"psi",
		"Pa",
	},
	["Speed"] = {
		heading = "سرعة",
		examples = { "60|mph|km/h", "60|mph|km/h|abbr=off", "60|mph|km/h|abbr=on" },
		"km/h",
		"km/s",
		"kn",
		"mph",
	},
	["Temperature"] = {
		heading = "درجة الحرارة",
		examples = { "100|C|F", "100|C|F|abbr=off", "100|C-change|F-change", "100|C-change|F-change|abbr=out" },
		"C",
		"F",
		"K",
		"C-change",
		"F-change",
		"K-change",
	},
	["Torque"] = {
		heading = "عزم الدوران",
		examples = { "12.5|Nm|lb.in", "12.5|Nm|lb.in|abbr=off", "12.5|Nm|lb.in|abbr=on|lk=on" },
		"lb.in",
		"lb.ft",
		"Nm",
	},
	["Volume"] = {
		heading = "حجم",
		examples = { "125|cuin|l", "125|cuin|l|abbr=off", "125|cuin|l|abbr=on" },
		"cuin",
		"cuft",
		"cuyd",
		"cumi",
		"impgal",
		"impoz",
		"usgal",
		"usoz",
		"L",
		"l",
		"m3",
		"cc",
		"mm3",
	},
}

-- Order in which sections are wanted when doing all common units.
local common_sections = {
	"Area",
	"Fuel efficiency",
	"Length",
	"Mass",
	"Pressure",
	"Speed",
	"Temperature",
	"Torque",
	"Volume",
}

local function _show_examples(frame, results, examples, want_table)
	local fmt
	if want_table then
		results:add('{|')
		fmt = '|<code>%s</code>|| ينتج ← ||%s'
	else
		fmt = '*<code>%s</code> ينتج ← %s'
	end
	for i, item in ipairs(examples) do
		if want_table and i > 1 then
			results:add('|-')
		end
		item = item:gsub('!', '|')
		item = '{{convert' .. (item:sub(1, 1) == '|' and '' or '|') .. item .. '}}'
		results:add(fmt:format(mw.text.nowiki(item), frame:preprocess(item)))
	end
	if want_table then
		results:add('|}')
	end
end

local function _show_units(frame, results, args)
	local do_full
	if args[1] == nil then
		do_full = true
		args = common_sections
	end
	local group = collection()
	for _, item in ipairs(args) do
		local units = common_units[item] or common_units[item:sub(1, 1):upper() .. item:sub(2)]
		if units then
			if group.n > 0 then
				maketable(results, group)
				group = collection()
			end
			if do_full then
				if units.heading then
					results:add('===' .. units.heading .. '===')
				end
				if units.examples then
					results:add('أمثلة:')
					_show_examples(frame, results, units.examples)
				end
			end
			maketable(results, units)
		else
			group:add(item)
		end
	end
	if group.n > 0 then
		maketable(results, group)
	end
end

local function show_examples(frame, want_table)
	local results = collection()
	local ok, msg = pcall(_show_examples, frame, results, frame.args, want_table)
	if ok then
		return results:join('\n')
	end
	return '<strong class="error">Error</strong>\n' .. msg
end

local function show_units(frame)
	local results = collection()
	local ok, msg = pcall(_show_units, frame, results, frame.args)
	if ok then
		return results:join('\n')
	end
	return '<strong class="error">Error</strong>\n' .. msg
end

return {
	unit = show_units,
	units = show_units,
	['list'] = function (frame) return show_examples(frame, false) end,
	['table'] = function (frame) return show_examples(frame, true) end,
}
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