| /*! |
| * negotiator |
| * Copyright(c) 2012 Federico Romero |
| * Copyright(c) 2012-2014 Isaac Z. Schlueter |
| * Copyright(c) 2015 Douglas Christopher Wilson |
| * MIT Licensed |
| */ |
| |
| 'use strict'; |
| |
| /** |
| * Cached loaded submodules. |
| * @private |
| */ |
| |
| var modules = Object.create(null); |
| |
| /** |
| * Module exports. |
| * @public |
| */ |
| |
| module.exports = Negotiator; |
| module.exports.Negotiator = Negotiator; |
| |
| /** |
| * Create a Negotiator instance from a request. |
| * @param {object} request |
| * @public |
| */ |
| |
| function Negotiator(request) { |
| if (!(this instanceof Negotiator)) { |
| return new Negotiator(request); |
| } |
| |
| this.request = request; |
| } |
| |
| Negotiator.prototype.charset = function charset(available) { |
| var set = this.charsets(available); |
| return set && set[0]; |
| }; |
| |
| Negotiator.prototype.charsets = function charsets(available) { |
| var preferredCharsets = loadModule('charset').preferredCharsets; |
| return preferredCharsets(this.request.headers['accept-charset'], available); |
| }; |
| |
| Negotiator.prototype.encoding = function encoding(available) { |
| var set = this.encodings(available); |
| return set && set[0]; |
| }; |
| |
| Negotiator.prototype.encodings = function encodings(available) { |
| var preferredEncodings = loadModule('encoding').preferredEncodings; |
| return preferredEncodings(this.request.headers['accept-encoding'], available); |
| }; |
| |
| Negotiator.prototype.language = function language(available) { |
| var set = this.languages(available); |
| return set && set[0]; |
| }; |
| |
| Negotiator.prototype.languages = function languages(available) { |
| var preferredLanguages = loadModule('language').preferredLanguages; |
| return preferredLanguages(this.request.headers['accept-language'], available); |
| }; |
| |
| Negotiator.prototype.mediaType = function mediaType(available) { |
| var set = this.mediaTypes(available); |
| return set && set[0]; |
| }; |
| |
| Negotiator.prototype.mediaTypes = function mediaTypes(available) { |
| var preferredMediaTypes = loadModule('mediaType').preferredMediaTypes; |
| return preferredMediaTypes(this.request.headers.accept, available); |
| }; |
| |
| // Backwards compatibility |
| Negotiator.prototype.preferredCharset = Negotiator.prototype.charset; |
| Negotiator.prototype.preferredCharsets = Negotiator.prototype.charsets; |
| Negotiator.prototype.preferredEncoding = Negotiator.prototype.encoding; |
| Negotiator.prototype.preferredEncodings = Negotiator.prototype.encodings; |
| Negotiator.prototype.preferredLanguage = Negotiator.prototype.language; |
| Negotiator.prototype.preferredLanguages = Negotiator.prototype.languages; |
| Negotiator.prototype.preferredMediaType = Negotiator.prototype.mediaType; |
| Negotiator.prototype.preferredMediaTypes = Negotiator.prototype.mediaTypes; |
| |
| /** |
| * Load the given module. |
| * @private |
| */ |
| |
| function loadModule(moduleName) { |
| var module = modules[moduleName]; |
| |
| if (module !== undefined) { |
| return module; |
| } |
| |
| // This uses a switch for static require analysis |
| switch (moduleName) { |
| case 'charset': |
| module = require('./lib/charset'); |
| break; |
| case 'encoding': |
| module = require('./lib/encoding'); |
| break; |
| case 'language': |
| module = require('./lib/language'); |
| break; |
| case 'mediaType': |
| module = require('./lib/mediaType'); |
| break; |
| default: |
| throw new Error('Cannot find module \'' + moduleName + '\''); |
| } |
| |
| // Store to prevent invoking require() |
| modules[moduleName] = module; |
| |
| return module; |
| } |