codekingpro/portable-devtools

1/*!
2 * negotiator
3 * Copyright(c) 2012 Federico Romero
4 * Copyright(c) 2012-2014 Isaac Z. Schlueter
5 * Copyright(c) 2015 Douglas Christopher Wilson
6 * MIT Licensed
7 */
8
9'use strict';
10
11var preferredCharsets = require('./lib/charset')
12var preferredEncodings = require('./lib/encoding')
13var preferredLanguages = require('./lib/language')
14var preferredMediaTypes = require('./lib/mediaType')
15
16/**
17 * Module exports.
18 * @public
19 */
20
21module.exports = Negotiator;
22module.exports.Negotiator = Negotiator;
23
24/**
25 * Create a Negotiator instance from a request.
26 * @param {object} request
27 * @public
28 */
29
30function Negotiator(request) {
31  if (!(this instanceof Negotiator)) {
32    return new Negotiator(request);
33  }
34
35  this.request = request;
36}
37
38Negotiator.prototype.charset = function charset(available) {
39  var set = this.charsets(available);
40  return set && set[0];
41};
42
43Negotiator.prototype.charsets = function charsets(available) {
44  return preferredCharsets(this.request.headers['accept-charset'], available);
45};
46
47Negotiator.prototype.encoding = function encoding(available, opts) {
48  var set = this.encodings(available, opts);
49  return set && set[0];
50};
51
52Negotiator.prototype.encodings = function encodings(available, options) {
53  var opts = options || {};
54  return preferredEncodings(this.request.headers['accept-encoding'], available, opts.preferred);
55};
56
57Negotiator.prototype.language = function language(available) {
58  var set = this.languages(available);
59  return set && set[0];
60};
61
62Negotiator.prototype.languages = function languages(available) {
63  return preferredLanguages(this.request.headers['accept-language'], available);
64};
65
66Negotiator.prototype.mediaType = function mediaType(available) {
67  var set = this.mediaTypes(available);
68  return set && set[0];
69};
70
71Negotiator.prototype.mediaTypes = function mediaTypes(available) {
72  return preferredMediaTypes(this.request.headers.accept, available);
73};
74
75// Backwards compatibility
76Negotiator.prototype.preferredCharset = Negotiator.prototype.charset;
77Negotiator.prototype.preferredCharsets = Negotiator.prototype.charsets;
78Negotiator.prototype.preferredEncoding = Negotiator.prototype.encoding;
79Negotiator.prototype.preferredEncodings = Negotiator.prototype.encodings;
80Negotiator.prototype.preferredLanguage = Negotiator.prototype.language;
81Negotiator.prototype.preferredLanguages = Negotiator.prototype.languages;
82Negotiator.prototype.preferredMediaType = Negotiator.prototype.mediaType;
83Negotiator.prototype.preferredMediaTypes = Negotiator.prototype.mediaTypes;
84