Module:Demo

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Usage

This module supports {{Demo}}

{{#invoke:Demo|main}}

The input must be wrapped in ‎<nowiki>...‎</nowiki> tags or else it may be processed before the module can read it. If you want to use this in another module (such as to make the output prettier), you can get values like so:

require('Module:demo').get(frame)

Function get() returns a table containing:

• source = the source code (without ‎<pre>...‎</pre> wrappers, characters substituted with html entities)
• output = the execution result of the source.
• frame = the frame from which this template took the parameter.

By default, get() takes the first parameter of frame. If the frame uses a different parameter name for the nowiki-wrapped source, then place that name (as a string) as the second parameter, like so require('Module:demo').get(frame, 'alternate_name')

Example:

p = {}

 function p.main(frame)
  local parts = require('Module:demo').get(frame)
  return '<Pretty html><pre>' .. parts.source .. '</pre><more pretty html>' .. parts.output .. '<even more pretty html>'
 end

 return p

local p = {}

--creates a frame object that cannot access any of the parent's args
--unless a table containing a list keys of not to inherit is provided
function disinherit(frame, onlyTheseKeys)
	local parent = frame:getParent() or frame
	local orphan = parent:newChild{}
	orphan.getParent = parent.getParent --returns nil
	orphan.args = {}
	if onlyTheseKeys then
		local family = {parent, frame}
		for f = 1, 2 do
			for k, v in pairs(family[f] and family[f].args or {}) do
				orphan.args[k] = orphan.args[k] or v
			end
		end
		parent.args = mw.clone(orphan.args)
		setmetatable(orphan.args, nil)
		for _, k in ipairs(onlyTheseKeys) do
			rawset(orphan.args, k, nil)
		end
	end
	return orphan, parent
end

function p.get(frame, arg, passArgs)
	local orphan, frame = disinherit(frame, passArgs and {arg or 1})
	local code, noWiki, preserve = frame.args[arg or 1] or ''
	if code:match'nowiki' then
		local placeholder, preserve = ('6'):char(), {}
		code = mw.text.unstripNoWiki(code)
		noWiki = code:gsub('%%', placeholder):gsub('&lt;', '<'):gsub('&gt;', '>')
		for k in noWiki:gmatch('&.-;') do
			if not preserve[k] then
				preserve[k] = true
				table.insert(preserve, (k:gsub('&', '&amp;')))
				noWiki = noWiki:gsub('(&.-;)', '%%%s')
			end
		end
		noWiki = mw.text.nowiki(noWiki):format(unpack(preserve)):gsub(placeholder, '%%')
	end
	return {
		source = noWiki or code,
		output = orphan:preprocess(code):gsub(frame.args.demo_kill_categories and '%[%[Category.-%]%]' or '', ''),
		frame = frame
	}
end

function p.main(frame, demoTable)
	local show = demoTable or p.get(frame)
	local args = show.frame.args
	args.br = tonumber(args.br or 1) and ('<br>'):rep(args.br or 1) or args.br or ''
	if show[args.result_arg] then
		return show[args.result_arg]
	end
	return string.format('<pre%s>%s</pre>%s%s', args.style and string.format(" style='%s'", args.style) or '', show.source, args.br, show.output)
end

-- Alternate function to return an inline result
function p.inline(frame, demoTable)
	local show = demoTable or p.get(frame)
	local args = show.frame.args
	if show[args.result_arg] then
		return show[args.result_arg]
	end
	return string.format('<code%s>%s</code>%s%s', args.style and string.format(" style='%s'", args.style) or '', show.source, ' → ', show.output)
end

--passing of args into other module without preprocessing
function p.module(frame)
	local orphan, frame = disinherit(frame, {
		'demo_template',
		'demo_module',
		'demo_module_func',
		'demo_main',
		'demo_br',
		'demo_result_arg',
		'demo_kill_categories'
	})
	local template = frame.args.demo_template and 'Template:'..frame.args.demo_template
	local demoFunc = frame.args.demo_module_func or 'main\n'
	local demoModule = require('Module:' .. frame.args.demo_module)[demoFunc:match('^%s*(.-)%s*$')]
	frame.args.br, frame.args.result_arg = frame.args.demo_br, frame.args.demo_result_arg
	if demoModule then
		local named = {insert = function(self, ...) table.insert(self, ...) return self end}
		local source = {insert = named.insert, '{{', frame.args.demo_template or frame.args.demo_module, '\n'}
		if not template then
			source:insert(2, '#invoke:'):insert(4, '|'):insert(5, demoFunc)
		end
		local insertNamed = #source + 1
		for k, v in pairs(orphan.args) do
			local nan, insert = type(k) ~= 'number', {v}
			local target = nan and named or source
			target:insert'|'
			if nan then
				target:insert(k):insert'=':insert'\n'
				table.insert(insert, 1, #target)
			end
			target:insert(unpack(insert))
			local nowiki = v:match('nowiki')
			if nowiki or v:match('{{.-}}') then
				orphan.args[k] = frame:preprocess(nowiki and mw.text.unstripNoWiki(v) or v)
			end
		end
		source:insert'}}'
		table.insert(source, insertNamed, table.concat(named))
		return p.main(orphan, {
			source = mw.text.encode(table.concat(source), "<>'|=~"),
			output = tostring(demoModule(orphan)):gsub(frame.args.demo_kill_categories and '%[%[Category.-%]%]' or '', ''),
			frame = frame
		})
	else
		return "ERROR: Invalid module function: "..demoFunc
	end
end

return p