Port of Punycode.js

A robust Punycode converter that fully complies to RFC 3492 and RFC 5891.

import { ucs2decode, ucs2encode, decode, encode, toASCII, toUnicode } from 'https://deno.land/x/punycode/mod.ts';

Converts a Punycode string of ASCII symbols to a string of Unicode symbols.

// decode domain name parts
decode('maana-pta'); // 'mañana'
decode('--dqo34k'); // '☃-⌘'

Converts a string of Unicode symbols to a Punycode string of ASCII symbols.

// encode domain name parts
encode('mañana'); // 'maana-pta'
encode('☃-⌘'); // '--dqo34k'

Converts a Punycode string representing a domain name or an email address to Unicode. Only the Punycoded parts of the input will be converted, i.e. it doesn’t matter if you call it on a string that has already been converted to Unicode.

// decode domain names
toUnicode('xn--maana-pta.com');
// → 'mañana.com'
toUnicode('xn----dqo34k.com');
// → '☃-⌘.com'

// decode email addresses
toUnicode('джумла@xn--p-8sbkgc5ag7bhce.xn--ba-lmcq');
// → 'джумла@джpумлатест.bрфa'

Converts a lowercased Unicode string representing a domain name or an email address to Punycode. Only the non-ASCII parts of the input will be converted, i.e. it doesn’t matter if you call it with a domain that’s already in ASCII.

// encode domain names
toASCII('mañana.com');
// → 'xn--maana-pta.com'
toASCII('☃-⌘.com');
// → 'xn----dqo34k.com'

// encode email addresses
toASCII('джумла@джpумлатест.bрфa');
// → 'джумла@xn--p-8sbkgc5ag7bhce.xn--ba-lmcq'

Creates an array containing the numeric code point values of each Unicode symbol in the string. While JavaScript uses UCS-2 internally, this function will convert a pair of surrogate halves (each of which UCS-2 exposes as separate characters) into a single code point, matching UTF-16.

ucs2decode('abc');
// → [0x61, 0x62, 0x63]
// surrogate pair for U+1D306 TETRAGRAM FOR CENTRE:
ucs2decode('\uD834\uDF06');
// → [0x1D306]

Creates a string based on an array of numeric code point values.

ucs2encode([0x61, 0x62, 0x63]);
// → 'abc'
ucs2encode([0x1D306]);
// → '\uD834\uDF06'

Punycode.ts is available under the MIT license.