source: trip-planner-front/node_modules/encoding/lib/encoding.js@ 6c1585f

Last change on this file since 6c1585f was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 2.1 KB
Line 
1'use strict';
2
3var iconvLite = require('iconv-lite');
4
5// Expose to the world
6module.exports.convert = convert;
7
8/**
9 * Convert encoding of an UTF-8 string or a buffer
10 *
11 * @param {String|Buffer} str String to be converted
12 * @param {String} to Encoding to be converted to
13 * @param {String} [from='UTF-8'] Encoding to be converted from
14 * @return {Buffer} Encoded string
15 */
16function convert(str, to, from) {
17 from = checkEncoding(from || 'UTF-8');
18 to = checkEncoding(to || 'UTF-8');
19 str = str || '';
20
21 var result;
22
23 if (from !== 'UTF-8' && typeof str === 'string') {
24 str = Buffer.from(str, 'binary');
25 }
26
27 if (from === to) {
28 if (typeof str === 'string') {
29 result = Buffer.from(str);
30 } else {
31 result = str;
32 }
33 } else {
34 try {
35 result = convertIconvLite(str, to, from);
36 } catch (E) {
37 console.error(E);
38 result = str;
39 }
40 }
41
42 if (typeof result === 'string') {
43 result = Buffer.from(result, 'utf-8');
44 }
45
46 return result;
47}
48
49/**
50 * Convert encoding of astring with iconv-lite
51 *
52 * @param {String|Buffer} str String to be converted
53 * @param {String} to Encoding to be converted to
54 * @param {String} [from='UTF-8'] Encoding to be converted from
55 * @return {Buffer} Encoded string
56 */
57function convertIconvLite(str, to, from) {
58 if (to === 'UTF-8') {
59 return iconvLite.decode(str, from);
60 } else if (from === 'UTF-8') {
61 return iconvLite.encode(str, to);
62 } else {
63 return iconvLite.encode(iconvLite.decode(str, from), to);
64 }
65}
66
67/**
68 * Converts charset name if needed
69 *
70 * @param {String} name Character set
71 * @return {String} Character set name
72 */
73function checkEncoding(name) {
74 return (name || '')
75 .toString()
76 .trim()
77 .replace(/^latin[\-_]?(\d+)$/i, 'ISO-8859-$1')
78 .replace(/^win(?:dows)?[\-_]?(\d+)$/i, 'WINDOWS-$1')
79 .replace(/^utf[\-_]?(\d+)$/i, 'UTF-$1')
80 .replace(/^ks_c_5601\-1987$/i, 'CP949')
81 .replace(/^us[\-_]?ascii$/i, 'ASCII')
82 .toUpperCase();
83}
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