Module:Template test case: Difference between revisions

    From Nonbinary Wiki
    (Implement basic support for testing a module.)
    m (87 revisions imported from wikipedia:Module:Template_test_case)
     
    (No difference)

    Latest revision as of 12:00, 21 May 2021

    Documentation for this module may be created at Module:Template test case/doc

    --[[
       A module for generating test case templates.
    
       This module incorporates code from the English Wikipedia's "Testcase table"
       module,[1] written by Frietjes [2] with contributions by Mr. Stradivarius [3]
       and Jackmcbarn,[4] and the English Wikipedia's "Testcase rows" module,[5]
       written by Mr. Stradivarius.
    
       The "Testcase table" and "Testcase rows" modules are released under the
       CC BY-SA 3.0 License [6] and the GFDL.[7]
    
       License: CC BY-SA 3.0 and the GFDL
       Author: Mr. Stradivarius
    
       [1] https://en.wikipedia.org/wiki/Module:Testcase_table
       [2] https://en.wikipedia.org/wiki/User:Frietjes
       [3] https://en.wikipedia.org/wiki/User:Mr._Stradivarius
       [4] https://en.wikipedia.org/wiki/User:Jackmcbarn
       [5] https://en.wikipedia.org/wiki/Module:Testcase_rows
       [6] https://en.wikipedia.org/wiki/Wikipedia:Text_of_Creative_Commons_Attribution-ShareAlike_3.0_Unported_License
       [7] https://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License
    ]]
    
    -- Load required modules
    local yesno = require('Module:Yesno')
    
    -- Set constants
    local DATA_MODULE = 'Module:Template test case/data'
    
    -------------------------------------------------------------------------------
    -- Shared methods
    -------------------------------------------------------------------------------
    
    local function message(self, key, ...)
    	-- This method is added to classes that need to deal with messages from the
    	-- config module.
    	local msg = self.cfg.msg[key]
    	if select(1, ...) then
    		return mw.message.newRawMessage(msg, ...):plain()
    	else
    		return msg
    	end
    end
    
    -------------------------------------------------------------------------------
    -- Template class
    -------------------------------------------------------------------------------
    
    local Template = {}
    
    Template.memoizedMethods = {
    	-- Names of methods to be memoized in each object. This table should only
    	-- hold methods with no parameters.
    	getFullPage = true,
    	getName = true,
    	makeHeader = true,
    	getOutput = true
    }
    
    function Template.new(invocationObj, options)
    	local obj = {}
    
    	-- Set input
    	for k, v in pairs(options or {}) do
    		if not Template[k] then
    			obj[k] = v
    		end
    	end
    	obj._invocation = invocationObj
    
    	-- Validate input
    	if not obj.template and not obj.title then
    		error('no template or title specified', 2)
    	end
    
    	-- Memoize expensive method calls
    	local memoFuncs = {}
    	return setmetatable(obj, {
    		__index = function (t, key)
    			if Template.memoizedMethods[key] then
    				local func = memoFuncs[key]
    				if not func then
    					local val = Template[key](t)
    					func = function () return val end
    					memoFuncs[key] = func
    				end
    				return func
    			else
    				return Template[key]
    			end
    		end
    	})
    end
    
    function Template:getFullPage()
    	if not self.template then
    		return self.title.prefixedText
    	elseif self.template:sub(1, 7) == '#invoke' then
    		return 'Module' .. self.template:sub(8):gsub('|.*', '')
    	else
    		local strippedTemplate, hasColon = self.template:gsub('^:', '', 1)
    		hasColon = hasColon > 0
    		local ns = strippedTemplate:match('^(.-):')
    		ns = ns and mw.site.namespaces[ns]
    		if ns then
    			return strippedTemplate
    		elseif hasColon then
    			return strippedTemplate -- Main namespace
    		else
    			return mw.site.namespaces[10].name .. ':' .. strippedTemplate
    		end
    	end
    end
    
    function Template:getName()
    	if self.template then
    		return self.template
    	else
    		return require('Module:Template invocation').name(self.title)
    	end
    end
    
    function Template:makeLink(display)
    	if display then
    		return string.format('[[:%s|%s]]', self:getFullPage(), display)
    	else
    		return string.format('[[:%s]]', self:getFullPage())
    	end
    end
    
    function Template:makeBraceLink(display)
    	display = display or self:getName()
    	local link = self:makeLink(display)
    	return mw.text.nowiki('{{') .. link .. mw.text.nowiki('}}')
    end
    
    function Template:makeHeader()
    	return self.heading or self:makeBraceLink()
    end
    
    function Template:getInvocation(format)
    	local invocation = self._invocation:getInvocation{
    		template = self:getName(),
    		requireMagicWord = self.requireMagicWord,
    	}
    	if format == 'code' then
    		invocation = '<code>' .. mw.text.nowiki(invocation) .. '</code>'
    	elseif format == 'kbd' then
    		invocation = '<kbd>' .. mw.text.nowiki(invocation) .. '</kbd>'
    	elseif format == 'plain' then
    		invocation = mw.text.nowiki(invocation)
    	else
    		-- Default is pre tags
    		invocation = mw.text.encode(invocation, '&')
    		invocation = '<pre style="white-space: pre-wrap;">' .. invocation .. '</pre>'
    		invocation = mw.getCurrentFrame():preprocess(invocation)
    	end
    	return invocation
    end
    
    function Template:getOutput()
    	local protect = require('Module:Protect')
    	-- calling self._invocation:getOutput{...}
    	return protect(self._invocation.getOutput)(self._invocation, {
    		template = self:getName(),
    		requireMagicWord = self.requireMagicWord,
    	})
    end
    
    -------------------------------------------------------------------------------
    -- TestCase class
    -------------------------------------------------------------------------------
    
    local TestCase = {}
    TestCase.__index = TestCase
    TestCase.message = message -- add the message method
    
    TestCase.renderMethods = {
    	-- Keys in this table are values of the "format" option, values are the
    	-- method for rendering that format.
    	columns = 'renderColumns',
    	rows = 'renderRows',
    	tablerows = 'renderRows',
    	inline = 'renderInline',
    	cells = 'renderCells',
    	default = 'renderDefault'
    }
    
    function TestCase.new(invocationObj, options, cfg)
    	local obj = setmetatable({}, TestCase)
    	obj.cfg = cfg
    
    	-- Separate general options from template options. Template options are
    	-- numbered, whereas general options are not.
    	local generalOptions, templateOptions = {}, {}
    	for k, v in pairs(options) do
    		local prefix, num
    		if type(k) == 'string' then
    			prefix, num = k:match('^(.-)([1-9][0-9]*)$')
    		end
    		if prefix then
    			num = tonumber(num)
    			templateOptions[num] = templateOptions[num] or {}
    			templateOptions[num][prefix] = v
    		else
    			generalOptions[k] = v
    		end
    	end
    
    	-- Set general options
    	generalOptions.showcode = yesno(generalOptions.showcode)
    	generalOptions.showheader = yesno(generalOptions.showheader) ~= false
    	generalOptions.showcaption = yesno(generalOptions.showcaption) ~= false
    	generalOptions.collapsible = yesno(generalOptions.collapsible)
    	generalOptions.notcollapsed = yesno(generalOptions.notcollapsed)
    	generalOptions.wantdiff = yesno(generalOptions.wantdiff) 
    	obj.options = generalOptions
    
    	-- Preprocess template args
    	for num, t in pairs(templateOptions) do
    		if t.showtemplate ~= nil then
    			t.showtemplate = yesno(t.showtemplate)
    		end
    	end
    
    	-- Set up first two template options tables, so that if only the
    	-- "template3" is specified it isn't made the first template when the
    	-- the table options array is compressed.
    	templateOptions[1] = templateOptions[1] or {}
    	templateOptions[2] = templateOptions[2] or {}
    
    	-- Allow the "template" option to override the "template1" option for
    	-- backwards compatibility with [[Module:Testcase table]].
    	if generalOptions.template then
    		templateOptions[1].template = generalOptions.template
    	end
    
    	-- Add default template options
    	if templateOptions[1].template and not templateOptions[2].template then
    		templateOptions[2].template = templateOptions[1].template ..
    			'/' .. obj.cfg.sandboxSubpage
    	end
    	if not templateOptions[1].template then
    		templateOptions[1].title = mw.title.getCurrentTitle().basePageTitle
    	end
    	if not templateOptions[2].template then
    		templateOptions[2].title = templateOptions[1].title:subPageTitle(
    			obj.cfg.sandboxSubpage
    		)
    	end
    
    	-- Remove template options for any templates where the showtemplate
    	-- argument is false. This prevents any output for that template.
    	for num, t in pairs(templateOptions) do
    		if t.showtemplate == false then
    			templateOptions[num] = nil
    		end
    	end
    
    	-- Check for missing template names.
    	for num, t in pairs(templateOptions) do
    		if not t.template and not t.title then
    			error(obj:message(
    				'missing-template-option-error',
    				num, num
    			), 2)
    		end
    	end
    
    	-- Compress templateOptions table so we can iterate over it with ipairs.
    	templateOptions = (function (t)
    		local nums = {}
    		for num in pairs(t) do
    			nums[#nums + 1] = num
    		end
    		table.sort(nums)
    		local ret = {}
    		for i, num in ipairs(nums) do
    			ret[i] = t[num]
    		end
    		return ret
    	end)(templateOptions)
    
    	-- Don't require the __TEMPLATENAME__ magic word for nowiki invocations if
    	-- there is only one template being output.
    	if #templateOptions <= 1 then
    		templateOptions[1].requireMagicWord = false
    	end
    
    	mw.logObject(templateOptions)
    
    	-- Make the template objects
    	obj.templates = {}
    	for i, options in ipairs(templateOptions) do
    		table.insert(obj.templates, Template.new(invocationObj, options))
    	end
    
    	-- Add tracking categories. At the moment we are only tracking templates
    	-- that use any "heading" parameters or an "output" parameter.
    	obj.categories = {}
    	for k, v in pairs(options) do
    		if type(k) == 'string' and k:find('heading') then
    			obj.categories['Test cases using heading parameters'] = true
    		elseif k == 'output' then
    			obj.categories['Test cases using output parameter'] = true
    		end
    	end
    
    	return obj
    end
    
    function TestCase:getTemplateOutput(templateObj)
    	local output = templateObj:getOutput()
    	if self.options.resetRefs then
    		mw.getCurrentFrame():extensionTag('references')
    	end
    	return output
    end
    
    function TestCase:templateOutputIsEqual()
    	-- Returns a boolean showing whether all of the template outputs are equal.
    	-- The random parts of strip markers (see [[Help:Strip markers]]) are
    	-- removed before comparison. This means a strip marker can contain anything
    	-- and still be treated as equal, but it solves the problem of otherwise
    	-- identical wikitext not returning as exactly equal.
    	local function normaliseOutput(obj)
    		local out = obj:getOutput()
    		-- Remove the random parts from strip markers.
    		out = out:gsub('(\127\'"`UNIQ.-)%-%x+%-(QINU`"\'\127)', '%1%2')
    		return out
    	end
    	local firstOutput = normaliseOutput(self.templates[1])
    	for i = 2, #self.templates do
    		local output = normaliseOutput(self.templates[i])
    		if output ~= firstOutput then
    			return false
    		end
    	end
    	return true
    end
    
    function TestCase:makeCollapsible(s)
    	local title = self.options.title or self.templates[1]:makeHeader()
    	if self.options.titlecode then
    		title = self.templates[1]:getInvocation('kbd')
    	end
    	local isEqual = self:templateOutputIsEqual()
    	local root = mw.html.create('table')
    	if self.options.wantdiff then
    	root
    		:addClass('mw-collapsible')
    	if self.options.notcollapsed == false then
    		root
    			:addClass('mw-collapsed')
    	end
    	root
    		:css('background-color', 'transparent')
    		:css('width', '100%')
    		:css('border', 'solid silver 1px')
    		:tag('tr')
    			:tag('th')
    				:css('background-color', isEqual and 'yellow' or '#90a8ee')
    				:wikitext(title)
    				:done()
    			:done()
    		:tag('tr')
    			:tag('td')
    				:newline()
    				:wikitext(s)
    				:newline()
    	else
    		root
    		:addClass('mw-collapsible')
    		if self.options.notcollapsed == false then
    			root
    				:addClass('mw-collapsed')
    		end
    		if self.options.notcollapsed ~= true or false then
    			root
    				:addClass(isEqual and 'mw-collapsed' or nil)
    		end
    		root
    		:css('background-color', 'transparent')
    		:css('width', '100%')
    		:css('border', 'solid silver 1px')
    		:tag('tr')
    			:tag('th')
    				:css('background-color', isEqual and 'lightgreen' or 'yellow')
    				:wikitext(title)
    				:done()
    			:done()
    		:tag('tr')
    			:tag('td')
    				:newline()
    				:wikitext(s)
    				:newline()
    	 end
    	return tostring(root)
    end
    
    function TestCase:renderColumns()
    	local root = mw.html.create()
    	if self.options.showcode then
    		root
    			:wikitext(self.templates[1]:getInvocation())
    			:newline()
    	end
    
    	local tableroot = root:tag('table')
    
    	if self.options.showheader then
    		-- Caption
    		if self.options.showcaption then
    			tableroot
    				:addClass(self.options.class)
    				:cssText(self.options.style)
    				:tag('caption')
    					:wikitext(self.options.caption or self:message('columns-header'))
    		end
    
    		-- Headers
    		local headerRow = tableroot:tag('tr')
    		if self.options.rowheader then
    			-- rowheader is correct here. We need to add another th cell if
    			-- rowheader is set further down, even if heading0 is missing.
    			headerRow:tag('th'):wikitext(self.options.heading0)
    		end
    		local width
    		if #self.templates > 0 then
    			width = tostring(math.floor(100 / #self.templates)) .. '%'
    		else
    			width = '100%'
    		end
    		for i, obj in ipairs(self.templates) do
    			headerRow
    				:tag('th')
    					:css('width', width)
    					:wikitext(obj:makeHeader())
    		end
    	end
    
    	-- Row header
    	local dataRow = tableroot:tag('tr'):css('vertical-align', 'top')
    	if self.options.rowheader then
    		dataRow:tag('th')
    			:attr('scope', 'row')
    			:wikitext(self.options.rowheader)
    	end
    	
    	-- Template output
    	for i, obj in ipairs(self.templates) do
    		if self.options.output == 'nowiki+' then
    			dataRow:tag('td')
    				:newline()
    				:wikitext(self.options.before)
    				:wikitext(self:getTemplateOutput(obj))
    				:wikitext(self.options.after)
    				:wikitext('<pre style="white-space: pre-wrap;">')
    				:wikitext(mw.text.nowiki(self.options.before or ""))
    				:wikitext(mw.text.nowiki(self:getTemplateOutput(obj)))
    				:wikitext(mw.text.nowiki(self.options.after or ""))
    				:wikitext('</pre>')
    		elseif self.options.output == 'nowiki' then
    			dataRow:tag('td')
    				:newline()
    				:wikitext(mw.text.nowiki(self.options.before or ""))
    				:wikitext(mw.text.nowiki(self:getTemplateOutput(obj)))
    				:wikitext(mw.text.nowiki(self.options.after or ""))
    		else
    			dataRow:tag('td')
    				:newline()
    				:wikitext(self.options.before)
    				:wikitext(self:getTemplateOutput(obj))
    				:wikitext(self.options.after)
    		end
    	end
    	
    	return tostring(root)
    end
    
    function TestCase:renderRows()
    	local root = mw.html.create()
    	if self.options.showcode then
    		root
    			:wikitext(self.templates[1]:getInvocation())
    			:newline()
    	end
    
    	local tableroot = root:tag('table')
    	tableroot
    		:addClass(self.options.class)
    		:cssText(self.options.style)
    
    	if self.options.caption then
    		tableroot
    			:tag('caption')
    				:wikitext(self.options.caption)
    	end
    
    	for _, obj in ipairs(self.templates) do
    		local dataRow = tableroot:tag('tr')
    		
    		-- Header
    		if self.options.showheader then
    			if self.options.format == 'tablerows' then
    				dataRow:tag('th')
    					:attr('scope', 'row')
    					:css('vertical-align', 'top')
    					:css('text-align', 'left')
    					:wikitext(obj:makeHeader())
    				dataRow:tag('td')
    					:css('vertical-align', 'top')
    					:css('padding', '0 1em')
    					:wikitext('→')
    			else
    				dataRow:tag('td')
    					:css('text-align', 'center')
    					:css('font-weight', 'bold')
    					:wikitext(obj:makeHeader())
    				dataRow = tableroot:tag('tr')
    			end
    		end
    		
    		-- Template output
    		if self.options.output == 'nowiki+' then
    			dataRow:tag('td')
    				:newline()
    				:wikitext(self:getTemplateOutput(obj))
    				:wikitext('<pre style="white-space: pre-wrap;">')
    				:wikitext(mw.text.nowiki(self:getTemplateOutput(obj)))
    				:wikitext('</pre>')
    		elseif self.options.output == 'nowiki' then
    			dataRow:tag('td')
    				:newline()
    				:wikitext(mw.text.nowiki(self:getTemplateOutput(obj)))
    		else
    			dataRow:tag('td')
    				:newline()
    				:wikitext(self:getTemplateOutput(obj))
    		end
    	end
    
    	return tostring(root)
    end
    
    function TestCase:renderInline()
    	local arrow = mw.language.getContentLanguage():getArrow('forwards')
    	local ret = {}
    	for i, obj in ipairs(self.templates) do
    		local line = {}
    		line[#line + 1] = self.options.prefix or '* '
    		if self.options.showcode then
    			line[#line + 1] = obj:getInvocation('code')
    			line[#line + 1] = ' '
    			line[#line + 1] = arrow
    			line[#line + 1] = ' '
    		end
    		if self.options.output == 'nowiki+' then
    			line[#line + 1] = self:getTemplateOutput(obj)
    			line[#line + 1] = '<pre style="white-space: pre-wrap;">'
    			line[#line + 1] = mw.text.nowiki(self:getTemplateOutput(obj))
    			line[#line + 1] = '</pre>'
    		elseif self.options.output == 'nowiki' then
    			line[#line + 1] = mw.text.nowiki(self:getTemplateOutput(obj))
    		else
    			line[#line + 1] = self:getTemplateOutput(obj)
    		end
    		ret[#ret + 1] = table.concat(line)
    	end
    	if self.options.addline then
    		local line = {}
    		line[#line + 1] = self.options.prefix or '* '
    		line[#line + 1] = self.options.addline
    		ret[#ret + 1] = table.concat(line)
    	end
    	return table.concat(ret, '\n')
    end
    
    function TestCase:renderCells()
    	local root = mw.html.create()
    	local dataRow = root:tag('tr')
    	dataRow
    		:css('vertical-align', 'top')
    		:addClass(self.options.class)
    		:cssText(self.options.style)
    
    	-- Row header
    	if self.options.rowheader then
    		dataRow:tag('th')
    			:attr('scope', 'row')
    			:newline()
    			:wikitext(self.options.rowheader or self:message('row-header'))
    	end
    	-- Caption
    	if self.options.showcaption then
    		dataRow:tag('th')
    			:attr('scope', 'row')
    			:newline()
    			:wikitext(self.options.caption or self:message('columns-header'))
    	end
    
    	-- Show code
    	if self.options.showcode then
    		dataRow:tag('td')
    			:newline()
    			:wikitext(self:getInvocation('code'))
    	end
    
    	-- Template output
    	for i, obj in ipairs(self.templates) do
    		if self.options.output == 'nowiki+' then
    			dataRow:tag('td')
    				:newline()
    				:wikitext(self.options.before)
    				:wikitext(self:getTemplateOutput(obj))
    				:wikitext(self.options.after)
    				:wikitext('<pre style="white-space: pre-wrap;">')
    				:wikitext(mw.text.nowiki(self.options.before or ""))
    				:wikitext(mw.text.nowiki(self:getTemplateOutput(obj)))
    				:wikitext(mw.text.nowiki(self.options.after or ""))
    				:wikitext('</pre>')
    		elseif self.options.output == 'nowiki' then
    			dataRow:tag('td')
    				:newline()
    				:wikitext(mw.text.nowiki(self.options.before or ""))
    				:wikitext(mw.text.nowiki(self:getTemplateOutput(obj)))
    				:wikitext(mw.text.nowiki(self.options.after or ""))
    		else
    			dataRow:tag('td')
    				:newline()
    				:wikitext(self.options.before)
    				:wikitext(self:getTemplateOutput(obj))
    				:wikitext(self.options.after)
    		end
    	end
    
    
    	return tostring(root)
    end
    
    function TestCase:renderDefault()
    	local ret = {}
    	if self.options.showcode then
    		ret[#ret + 1] = self.templates[1]:getInvocation()
    	end
    	for i, obj in ipairs(self.templates) do
    		ret[#ret + 1] = '<div style="clear: both;"></div>'
    		if self.options.showheader then
    			ret[#ret + 1] = obj:makeHeader()
    		end
    		if self.options.output == 'nowiki+' then
    			ret[#ret + 1] = self:getTemplateOutput(obj) .. '<pre style="white-space: pre-wrap;">' .. mw.text.nowiki(self:getTemplateOutput(obj)) .. '</pre>'
    		elseif self.options.output == 'nowiki' then
    			ret[#ret + 1] = mw.text.nowiki(self:getTemplateOutput(obj))
    		else
    			ret[#ret + 1] = self:getTemplateOutput(obj)
    		end
    	end
    	return table.concat(ret, '\n\n')
    end
    
    function TestCase:__tostring()
    	local format = self.options.format
    	local method = format and TestCase.renderMethods[format] or 'renderDefault'
    	local ret = self[method](self)
    	if self.options.collapsible then
    		ret = self:makeCollapsible(ret)
    	end
    	for cat in pairs(self.categories) do
    		ret = ret .. string.format('[[Category:%s]]', cat)
    	end
    	return ret
    end
    
    -------------------------------------------------------------------------------
    -- Nowiki invocation class
    -------------------------------------------------------------------------------
    
    local NowikiInvocation = {}
    NowikiInvocation.__index = NowikiInvocation
    NowikiInvocation.message = message -- Add the message method
    
    function NowikiInvocation.new(invocation, cfg)
    	local obj = setmetatable({}, NowikiInvocation)
    	obj.cfg = cfg
    	invocation = mw.text.unstrip(invocation)
    	-- Decode HTML entities for <, >, and ". This means that HTML entities in
    	-- the original code must be escaped as e.g. &amp;lt;, which is unfortunate,
    	-- but it is the best we can do as the distinction between <, >, " and &lt;,
    	-- &gt;, &quot; is lost during the original nowiki operation.
    	invocation = invocation:gsub('&lt;', '<')
    	invocation = invocation:gsub('&gt;', '>')
    	invocation = invocation:gsub('&quot;', '"')
    	obj.invocation = invocation
    	return obj
    end
    
    function NowikiInvocation:getInvocation(options)
    	local template = options.template:gsub('%%', '%%%%') -- Escape "%" with "%%"
    	local invocation, count = self.invocation:gsub(
    		self.cfg.templateNameMagicWordPattern,
    		template
    	)
    	if options.requireMagicWord ~= false and count < 1 then
    		error(self:message(
    			'nowiki-magic-word-error',
    			self.cfg.templateNameMagicWord
    		))
    	end
    	return invocation
    end
    
    function NowikiInvocation:getOutput(options)
    	local invocation = self:getInvocation(options)
    	return mw.getCurrentFrame():preprocess(invocation)
    end
    
    -------------------------------------------------------------------------------
    -- Table invocation class
    -------------------------------------------------------------------------------
    
    local TableInvocation = {}
    TableInvocation.__index = TableInvocation
    TableInvocation.message = message -- Add the message method
    
    function TableInvocation.new(invokeArgs, nowikiCode, cfg)
    	local obj = setmetatable({}, TableInvocation)
    	obj.cfg = cfg
    	obj.invokeArgs = invokeArgs
    	obj.code = nowikiCode
    	return obj
    end
    
    function TableInvocation:getInvocation(options)
    	if self.code then
    		local nowikiObj = NowikiInvocation.new(self.code, self.cfg)
    		return nowikiObj:getInvocation(options)
    	else
    		return require('Module:Template invocation').invocation(
    			options.template,
    			self.invokeArgs
    		)
    	end
    end
    
    function TableInvocation:getOutput(options)
    	if (options.template:sub(1, 7) == '#invoke') then
    		local moduleCall = mw.text.split(options.template, '|', true)
    		local args = mw.clone(self.invokeArgs)
    		table.insert(args, 1, moduleCall[2])
    		return mw.getCurrentFrame():callParserFunction(moduleCall[1], args)
    	end
    	return mw.getCurrentFrame():expandTemplate{
    		title = options.template,
    		args = self.invokeArgs
    	}
    end
    
    -------------------------------------------------------------------------------
    -- Bridge functions
    --
    -- These functions translate template arguments into forms that can be accepted
    -- by the different classes, and return the results.
    -------------------------------------------------------------------------------
    
    local bridge = {}
    
    function bridge.table(args, cfg)
    	cfg = cfg or mw.loadData(DATA_MODULE)
    
    	local options, invokeArgs = {}, {}
    	for k, v in pairs(args) do
    		local optionKey = type(k) == 'string' and k:match('^_(.*)$')
    		if optionKey then
    			if type(v) == 'string' then
    				v = v:match('^%s*(.-)%s*$') -- trim whitespace
    			end
    			if v ~= '' then
    				options[optionKey] = v
    			end
    		else
    			invokeArgs[k] = v
    		end
    	end
    
    	-- Allow passing a nowiki invocation as an option. While this means users
    	-- have to pass in the code twice, whitespace is preserved and &lt; etc.
    	-- will work as intended.
    	local nowikiCode = options.code
    	options.code = nil
    
    	local invocationObj = TableInvocation.new(invokeArgs, nowikiCode, cfg)
    	local testCaseObj = TestCase.new(invocationObj, options, cfg)
    	return tostring(testCaseObj)
    end
    
    function bridge.nowiki(args, cfg)
    	cfg = cfg or mw.loadData(DATA_MODULE)
    
    	local code = args.code or args[1]
    	local invocationObj = NowikiInvocation.new(code, cfg)
    	args.code = nil
    	args[1] = nil
    	-- Assume we want to see the code as we already passed it in.
    	args.showcode = args.showcode or true
    	local testCaseObj = TestCase.new(invocationObj, args, cfg)
    	return tostring(testCaseObj)
    end
    
    -------------------------------------------------------------------------------
    -- Exports
    -------------------------------------------------------------------------------
    
    local p = {}
    
    function p.main(frame, cfg)
    	cfg = cfg or mw.loadData(DATA_MODULE)
    
    	-- Load the wrapper config, if any.
    	local wrapperConfig
    	if frame.getParent then
    		local title = frame:getParent():getTitle()
    		local template = title:gsub(cfg.sandboxSubpagePattern, '')
    		wrapperConfig = cfg.wrappers[template]
    	end
    
    	-- Work out the function we will call, use it to generate the config for
    	-- Module:Arguments, and use Module:Arguments to find the arguments passed
    	-- by the user.
    	local func = wrapperConfig and wrapperConfig.func or 'table'
    	local userArgs = require('Module:Arguments').getArgs(frame, {
    		parentOnly = wrapperConfig,
    		frameOnly = not wrapperConfig,
    		trim = func ~= 'table',
    		removeBlanks = func ~= 'table'
    	})
    
    	-- Get default args and build the args table. User-specified args overwrite
    	-- default args.
    	local defaultArgs = wrapperConfig and wrapperConfig.args or {}
    	local args = {}
    	for k, v in pairs(defaultArgs) do
    		args[k] = v
    	end
    	for k, v in pairs(userArgs) do
    		args[k] = v
    	end
    
    	return bridge[func](args, cfg)
    end
    
    function p._exportClasses() -- For testing
    	return {
    		Template = Template,
    		TestCase = TestCase,
    		NowikiInvocation = NowikiInvocation,
    		TableInvocation = TableInvocation
    	}
    end
    
    return p