source: trip-planner-front/node_modules/mime/Mime.js@ fa375fe

Last change on this file since fa375fe was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

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File size: 2.8 KB
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1'use strict';
2
3/**
4 * @param typeMap [Object] Map of MIME type -> Array[extensions]
5 * @param ...
6 */
7function Mime() {
8 this._types = Object.create(null);
9 this._extensions = Object.create(null);
10
11 for (let i = 0; i < arguments.length; i++) {
12 this.define(arguments[i]);
13 }
14
15 this.define = this.define.bind(this);
16 this.getType = this.getType.bind(this);
17 this.getExtension = this.getExtension.bind(this);
18}
19
20/**
21 * Define mimetype -> extension mappings. Each key is a mime-type that maps
22 * to an array of extensions associated with the type. The first extension is
23 * used as the default extension for the type.
24 *
25 * e.g. mime.define({'audio/ogg', ['oga', 'ogg', 'spx']});
26 *
27 * If a type declares an extension that has already been defined, an error will
28 * be thrown. To suppress this error and force the extension to be associated
29 * with the new type, pass `force`=true. Alternatively, you may prefix the
30 * extension with "*" to map the type to extension, without mapping the
31 * extension to the type.
32 *
33 * e.g. mime.define({'audio/wav', ['wav']}, {'audio/x-wav', ['*wav']});
34 *
35 *
36 * @param map (Object) type definitions
37 * @param force (Boolean) if true, force overriding of existing definitions
38 */
39Mime.prototype.define = function(typeMap, force) {
40 for (let type in typeMap) {
41 let extensions = typeMap[type].map(function(t) {
42 return t.toLowerCase();
43 });
44 type = type.toLowerCase();
45
46 for (let i = 0; i < extensions.length; i++) {
47 const ext = extensions[i];
48
49 // '*' prefix = not the preferred type for this extension. So fixup the
50 // extension, and skip it.
51 if (ext[0] === '*') {
52 continue;
53 }
54
55 if (!force && (ext in this._types)) {
56 throw new Error(
57 'Attempt to change mapping for "' + ext +
58 '" extension from "' + this._types[ext] + '" to "' + type +
59 '". Pass `force=true` to allow this, otherwise remove "' + ext +
60 '" from the list of extensions for "' + type + '".'
61 );
62 }
63
64 this._types[ext] = type;
65 }
66
67 // Use first extension as default
68 if (force || !this._extensions[type]) {
69 const ext = extensions[0];
70 this._extensions[type] = (ext[0] !== '*') ? ext : ext.substr(1);
71 }
72 }
73};
74
75/**
76 * Lookup a mime type based on extension
77 */
78Mime.prototype.getType = function(path) {
79 path = String(path);
80 let last = path.replace(/^.*[/\\]/, '').toLowerCase();
81 let ext = last.replace(/^.*\./, '').toLowerCase();
82
83 let hasPath = last.length < path.length;
84 let hasDot = ext.length < last.length - 1;
85
86 return (hasDot || !hasPath) && this._types[ext] || null;
87};
88
89/**
90 * Return file extension associated with a mime type
91 */
92Mime.prototype.getExtension = function(type) {
93 type = /^\s*([^;\s]*)/.test(type) && RegExp.$1;
94 return type && this._extensions[type.toLowerCase()] || null;
95};
96
97module.exports = Mime;
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