Module:File link

-- This module provides a library for formatting image wikilinks.

local libraryUtil = require('libraryUtil') local checkType = libraryUtil.checkType

local image = {}

function image.new(filename) checkType('image.new', 1, filename, 'string', true) local obj, data = {}, {} local checkSelf = libraryUtil.makeCheckSelfFunction(		'image',		'image',		obj,		'image object'	) -- Set the filename if we were passed it as an input to image.new. if filename then data.theName = filename end function data:name(s) checkSelf(self, 'image:name') checkType('image:name', 1, s, 'string') data.theName = s		return self end function data:format(s, filename) checkSelf(self, 'image:format') checkType('image:format', 1, s, 'string', true) checkType('image:format', 2, format, 'string', true) local validFormats = { thumb = true, thumbnail = true, frame = true, framed = true, frameless = true }		if s == nil or validFormats[s] then data.theFormat = s			data.theFormatFilename = filename else error(string.format( "bad argument #1 to 'image:format' ('%s' is not a valid format)", s ), 2)		end return self end

local function sizeError(methodName) -- Used for formatting duplication errors in size-related methods. error(string.format( "duplicate size argument detected in '%s'" .. " ('upright' cannot be used in conjunction with height or width)", methodName ), 3)	end function data:width(px) checkSelf(self, 'image:width') checkType('image:width', 1, px, 'number', true) if px and data.isUpright then sizeError('image:width') end data.theWidth = px		return self end function data:height(px) checkSelf(self, 'image:height') checkType('image:height', 1, px, 'number', true) if px and data.isUpright then sizeError('image:height') end data.theHeight = px		return self end function data:upright(isUpright, factor) checkSelf(self, 'image:upright') checkType('image:upright', 1, isUpright, 'boolean', true) checkType('image:upright', 2, factor, 'number', true) if isUpright and (data.theWidth or data.theHeight) then sizeError('image:upright') end data.isUpright = isUpright data.uprightFactor = factor return self end function data:resetSize checkSelf(self, 'image:resetSize') for i, field in ipairs{'theWidth', 'theHeight', 'isUpright', 'uprightFactor'} do			data[field] = nil end return self end function data:location(s) checkSelf(self, 'image:location') checkType('image:location', 1, s, 'string', true) local validLocations = { right = true, left = true, center = true, none = true }		if s == nil or validLocations[s] then data.theLocation = s		else error(string.format( "bad argument #1 to 'image:location' ('%s' is not a valid location)", s ), 2)		end return self end function data:alignment(s) checkSelf(self, 'image:alignment') checkType('image:alignment', 1, s, 'string', true) local validAlignments = { baseline = true, middle = true, sub = true, super = true, ['text-top'] = true, ['text-bottom'] = true, top = true, bottom = true }		if s == nil or validAlignments[s] then data.theAlignment = s		else error(string.format( "bad argument #1 to 'image:alignment' ('%s' is not a valid alignment)", s ), 2)		end return self end function data:border(hasBorder) checkSelf(self, 'image:border') checkType('image:border', 1, hasBorder, 'boolean', true) data.hasBorder = hasBorder return self end function data:link(s) checkSelf(self, 'image:link') checkType('image:link', 1, s, 'string', true) data.theLink = s		return self end function data:alt(s) checkSelf(self, 'image:alt') checkType('image:alt', 1, s, 'string', true) data.theAlt = s		return self end function data:page(num) checkSelf(self, 'image:page') checkType('image:page', 1, num, 'number', true) data.thePage = s		return self end function data:class(s) checkSelf(self, 'image:class') checkType('image:class', 1, s, 'string', true) data.theClass = s		return self end function data:lang(s) checkSelf(self, 'image:lang') checkType('image:lang', 1, s, 'string', true) data.theLang = s		return self end function data:caption(s) checkSelf(self, 'image:caption') checkType('image:caption', 1, s, 'string', true) data.theCaption = s		return self end function data:render checkSelf(self, 'image:render') local ret = {} -- Image name. if not data.theName then error('image:render: no image name was found') end ret[#ret + 1] = 'File:' .. data.theName -- Image format if data.theFormat and data.theFormatFilename then ret[#ret + 1] = data.theFormat .. '=' .. data.theFormatFilename elseif data.theFormat then ret[#ret + 1] = data.theFormat end -- Border if data.hasBorder then ret[#ret + 1] = 'border' end -- Location ret[#ret + 1] = data.theLocation

-- Alignment ret[#ret + 1] = data.theAlignment -- Size if data.isUpright and data.uprightFactor then ret[#ret + 1] = 'upright=' .. tostring(data.uprightFactor) elseif data.isUpright then ret[#ret + 1] = 'upright' elseif data.theWidth and data.theHeight then ret[#ret + 1] = string.format('%dx%dpx', data.theWidth, data.theHeight) elseif data.theWidth then ret[#ret + 1] = tostring(data.theWidth) .. 'px' elseif data.theHeight then ret[#ret + 1] = string.format('x%dpx', data.theHeight) end -- Render named parameters. -- That includes link, alt, page, class, and lang. do local namedParameters = {'link', 'alt', 'page', 'class', 'lang'} for i, parameter in ipairs(namedParameters) do local dataField = 'the' .. parameter:sub(1, 1):upper .. parameter:sub(2, -1) local value = data[dataField] if value then ret[#ret + 1] = parameter .. '=' .. tostring(value) end end end

-- Caption ret[#ret + 1] = data.theCaption return string.format('%s', table.concat(ret, '|')) end local privateFields = { theName = true, theFormat = true, theFormatFilename = true, theWidth = true, theHeight = true, isUpright = true, uprightFactor = true, theLocation = true, theAlignment = true, hasBorder = true, theLink = true, theAlt = true, thePage = true, theClass = true, theLang = true, theCaption = true }	local readOnlyFields = {} for field in pairs(data) do		readOnlyFields[field] = true end readOnlyFields.theName = nil -- This is set if a filename is given to image.new, so remove it. local function restrictedFieldError(key, restriction) error(string.format( "image object field '%s' is %s", tostring(key), restriction ), 3)	end setmetatable(obj, {		__index = function (t, key)			if privateFields[key] then				restrictedFieldError(key, 'private')			else				return data[key]			end		end,		__newindex = function (t, key, value)			if privateFields[key] then				restrictedFieldError(key, 'private')			elseif readOnlyFields[key] then				restrictedFieldError(key, 'read-only')			else				data[key] = value			end		end,		__tostring = function (t)			return t:render		end,		__pairs = function 			local temp = {}			for k, v in pairs(data) do				if not privateFields[k] then					temp[k] = v				end			end			return pairs(temp)		end	}) return obj end

return image