File link:

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

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

local fileLink = {}

function fileLink.new(filename) checkType('fileLink.new', 1, filename, 'string', true) local obj, data = {}, {}

local checkSelf = libraryUtil.makeCheckSelfFunction( 'fileLink', 'fileLink', obj, 'fileLink object' )

-- Set the filename if we were passed it as an input to fileLink.new. if filename then data.theName = filename end

function data:name(s) checkSelf(self, 'name') checkType('fileLink:name', 1, s, 'string') data.theName = s return self end

function data:format(s, filename) checkSelf(self, 'format') checkType('fileLink:format', 1, s, 'string', true) checkType('fileLink: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 'fileLink: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, 'width') checkType('fileLink:width', 1, px, 'number', true) if px and data.isUpright then sizeError('fileLink:width') end data.theWidth = px return self end

function data:height(px) checkSelf(self, 'height') checkType('fileLink:height', 1, px, 'number', true) if px and data.isUpright then sizeError('fileLink:height') end data.theHeight = px return self end

function data:upright(isUpright, factor) checkSelf(self, 'upright') checkType('fileLink:upright', 1, isUpright, 'boolean', true) checkType('fileLink:upright', 2, factor, 'number', true) if isUpright and (data.theWidth or data.theHeight) then sizeError('fileLink:upright') end data.isUpright = isUpright data.uprightFactor = factor return self end

function data:resetSize() checkSelf(self, 'resetSize') for i, field in ipairs{'theWidth', 'theHeight', 'isUpright', 'uprightFactor'} do data[field] = nil end return self end

function data:location(s) checkSelf(self, 'location') checkType('fileLink: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 'fileLink:location' ('%s' is not a valid location)", s ), 2) end return self end

function data:alignment(s) checkSelf(self, 'alignment') checkType('fileLink: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 'fileLink:alignment' ('%s' is not a valid alignment)", s ), 2) end return self end

function data:border(hasBorder) checkSelf(self, 'border') checkType('fileLink:border', 1, hasBorder, 'boolean', true) data.hasBorder = hasBorder return self end

function data:link(s) checkSelf(self, 'link') checkType('fileLink:link', 1, s, 'string', true) data.theLink = s return self end

function data:alt(s) checkSelf(self, 'alt') checkType('fileLink:alt', 1, s, 'string', true) data.theAlt = s return self end

function data:page(num) checkSelf(self, 'page') checkType('fileLink:page', 1, num, 'number', true) data.thePage = s return self end

function data:class(s) checkSelf(self, 'class') checkType('fileLink:class', 1, s, 'string', true) data.theClass = s return self end

function data:lang(s) checkSelf(self, 'lang') checkType('fileLink:lang', 1, s, 'string', true) data.theLang = s return self end

local function checkTypeStringOrNum(funcName, pos, arg) local argType = type(arg) if argType ~= 'nil' and argType ~= 'string' and argType ~= 'number' then error(string.format( "bad argument #%d to '%s' (string or number expected, got %s)", pos, funcName, argType ), 3) end end

function data:startTime(time) checkSelf(self, 'startTime') checkTypeStringOrNum('fileLink:startTime', 1, time) data.theStartTime = time return self end

function data:endTime(time) checkSelf(self, 'endTime') checkTypeStringOrNum('fileLink:endTime', 1, time) data.theEndTime = time return self end

function data:thumbTime(time) checkSelf(self, 'thumbTime') checkTypeStringOrNum('fileLink:thumbTime', 1, time) data.theThumbTime = time return self end

function data:caption(s) checkSelf(self, 'caption') checkType('fileLink:caption', 1, s, 'string', true) data.theCaption = s return self end

function data:render() checkSelf(self, 'render') local ret = {}

-- Filename if not data.theName then error('fileLink:render: no filename was found') end ret[#ret + 1] = 'File:' .. data.theName

-- 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, lang, start, end, and thumbtime. do local namedParameters = { {'link', 'theLink'}, {'alt', 'theAlt'}, {'page', 'thePage'}, {'class', 'theClass'}, {'lang', 'theLang'}, {'start', 'theStartTime'}, {'end', 'theEndTime'}, {'thumbtime', 'theThumbTime'} } for i, t in ipairs(namedParameters) do local parameter = t[1] local value = data[t[2]] 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 fileLink.new, so remove it.

local function restrictedFieldError(key, restriction) error(string.format( "fileLink 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 fileLink