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# ens-normalize.js
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0-dependency [Ethereum Name Service](https://ens.domains/) (ENS) Name Normalizer.
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`npm i @adraffy/ens-normalize` [✓](https://www.npmjs.com/package/@adraffy/ens-normalize)
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* 🏛️ Follows [**ENSIP-15**: ENS Name Normalization Standard](https://docs.ens.domains/ensip/15)
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* Unicode: [`17.0.0`](./derive/data/17.0.0/) • CLDR: [`47`](./derive/data/CLDR-47/)
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* Other implementations:
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* Python — [namehash/**ens-normalize-python**](https://github.com/namehash/ens-normalize-python)
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* Rust — [sevenzing/**ens-normalize-rs**](https://github.com/sevenzing/ens-normalize-rs)
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* Zig — [evmts/**z-ens-normalize**](https://github.com/evmts/z-ens-normalize)
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* C# — [adraffy/**ENSNormalize.cs**](https://github.com/adraffy/ENSNormalize.cs)
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* Java — [adraffy/**ENSNormalize.java**](https://github.com/adraffy/ENSNormalize.java)
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* Swift – [adraffy/**ENSNormalize.swift**](https://github.com/adraffy/ENSNormalize.swift)
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* Go — [adraffy/**go-ens-normalize**](https://github.com/adraffy/go-ens-normalize)
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* Swift – [adraffy/**ENSNormalize.swift**](https://github.com/adraffy/ENSNormalize.swift)
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* Prior implementation:
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* Javascript — [ensdomains/**eth-ens-namehash**](https://github.com/ensdomains/eth-ens-namehash)
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* [Breakdown Reports from ENSIP-1](https://adraffy.github.io/ens-norm-tests/test-breakdown/output-20230226/)
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* ✅️ Passes **100%** [ENSIP-15 Validation Tests](https://adraffy.github.io/ens-normalize.js/test/validate.html)
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* ✅️ Passes **100%** [Unicode Normalization Tests](https://adraffy.github.io/ens-normalize.js/test/report-nf.html)
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* Minified File Sizes:
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* [`29KB`](./dist/index-xnf.min.js) — native NFC via [nf-native.js](./src/nf-native.js) using `String.normalize()` ⚠️
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* [`38KB` **Default**](./dist/index.min.js) — custom NFC via [nf.js](./src/nf.js)
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* [`44KB`](./dist/all.min.js) *Everything!* — custom NFC + sub-libraries: [parts.js](./src/parts.js), [utils.js](./src/utils.js)
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* Included Apps:
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* [**Resolver Demo**](https://adraffy.github.io/ens-normalize.js/test/resolver.html) ⭐
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* [Supported Emoji](https://adraffy.github.io/ens-normalize.js/test/emoji.html)
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* [Character Viewer](https://adraffy.github.io/ens-normalize.js/test/chars.html)
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* [Confused Explainer](https://adraffy.github.io/ens-normalize.js/test/confused.html)
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* Related Projects:
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* [Recent .eth Registrations](https://raffy.antistupid.com/eth/ens-regs.html) • [Renews](https://raffy.antistupid.com/eth/ens-renews.html) • [Expirations](https://raffy.antistupid.com/eth/ens-exp.html)
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* [Label Database](https://github.com/adraffy/ens-labels/) • [Labelhash⁻¹](https://adraffy.github.io/ens-labels/demo.html) • [Brute-force](https://raffy.antistupid.com/eth/ens-brute.html)
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* [Emoji Frequency Explorer](https://raffy.antistupid.com/eth/ens-emoji-freq.html)
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* [adraffy/**punycode.js**](https://github.com/adraffy/punycode.js/) • [Punycode Coder](https://adraffy.github.io/punycode.js/test/demo.html)
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* [adraffy/**keccak.js**](https://github.com/adraffy/keccak.js/) • [Keccak Hasher](https://adraffy.github.io/keccak.js/test/demo.html)
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* [adraffy/**emoji.js**](https://github.com/adraffy/emoji.js/) • [Emoji Parser](https://adraffy.github.io/emoji.js/test/demo.html)
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* More links at bottom of [Resolver Demo](https://adraffy.github.io/ens-normalize.js/test/resolver.html)
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```js
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import {ens_normalize} from '@adraffy/ens-normalize'; // or require()
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// browser: https://cdn.jsdelivr.net/npm/@adraffy/ens-normalize@latest/dist/index.min.mjs (or .cjs)
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// *** ALL errors thrown by this library are safe to print ***
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// - characters are shown as {HEX} if should_escape()
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// - potentially different bidi directions inside "quotes"
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// - 200E is used near "quotes" to prevent spillover
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// - an "error type" can be extracted by slicing up to the first (:)
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// - labels are middle-truncated with ellipsis (…) at 63 cps
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// string -> string
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// throws on invalid names
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// output ready for namehash
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let normalized = ens_normalize('RaFFY🚴♂️.eTh');
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// => "raffy🚴♂.eth"
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// note: does not enforce .eth registrar 3-character minimum
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```
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Format names with fully-qualified emoji:
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```js
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// works like ens_normalize()
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// output ready for display
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let pretty = ens_beautify('1⃣2⃣.eth');
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// => "1️⃣2️⃣.eth"
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// note: normalization is unchanged:
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// ens_normalize(ens_beautify(x)) == ens_normalize(x)
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```
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Normalize name fragments for [substring search](./test/fragment.js):
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```js
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// these fragments fail ens_normalize()
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// but will normalize fine as fragments
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let frag1 = ens_normalize_fragment('AB--'); // expected error: label ext
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let frag2 = ens_normalize_fragment('\u{303}'); // expected error: leading cm
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let frag3 = ens_normalize_fragment('οо'); // expected error: mixture
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```
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Input-based tokenization:
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```js
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// string -> Token[]
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// never throws
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let tokens = ens_tokenize('_R💩\u{FE0F}a\u{FE0F}\u{304}\u{AD}./');
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// [
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// { type: 'valid', cps: [ 95 ] }, // valid (as-is)
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// {
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// type: 'mapped',
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// cp: 82, // input
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// cps: [ 114 ] // output
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// },
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// {
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// type: 'emoji',
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// input: Emoji(2) [ 128169, 65039 ], // input
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// emoji: [ 128169, 65039 ], // fully-qualified
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// cps: Emoji(1) [ 128169 ] // output (normalized)
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// },
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// {
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// type: 'nfc',
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// input: [ 97, 772 ], // input (before nfc)
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// cps: [ 257 ], // output (after nfc)
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// tokens0: [ // tokens (before nfc)
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// { type: 'valid', cps: [ 97 ] },
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// { type: 'ignored', cp: 65039 },
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// { type: 'valid', cps: [ 772 ] }
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// ],
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// tokens: [ // tokens (after nfc)
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// { type: 'valid', cps: [ 257 ] }
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// ]
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// },
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// { type: 'ignored', cp: 173 },
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// { type: 'stop', cp: 46 },
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// { type: 'disallowed', cp: 47 }
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// ]
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// note: if name is normalizable, then:
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// ens_normalize(ens_tokenize(name).map(token => {
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// ** convert valid/mapped/nfc/stop to string **
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// }).join('')) == ens_normalize(name)
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```
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Output-based tokenization:
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```js
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// string -> Label[]
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// never throws
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let labels = ens_split('💩Raffy.eth_');
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// [
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// {
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// input: [ 128169, 82, 97, 102, 102, 121 ],
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// offset: 0, // index of codepoint, not substring index!
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// // (corresponding length can be inferred from input)
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// tokens: [
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// Emoji(2) [ 128169, 65039 ], // emoji
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// [ 114, 97, 102, 102, 121 ] // nfc-text
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// ],
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// output: [ 128169, 114, 97, 102, 102, 121 ],
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// emoji: true,
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// type: 'Latin'
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// },
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// {
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// input: [ 101, 116, 104, 95 ],
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// offset: 7,
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// tokens: [ [ 101, 116, 104, 95 ] ],
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// output: [ 101, 116, 104, 95 ],
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// error: Error('underscore allowed only at start')
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// }
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// ]
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```
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Generate a sorted array of (beautified) supported emoji codepoints:
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```js
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// () -> number[][]
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let emojis = ens_emoji();
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// [
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// [ 2764 ],
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// [ 128169, 65039 ],
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// [ 128105, 127997, 8205, 9877, 65039 ],
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// ...
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// ]
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```
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Determine if a character shouldn't be printed directly:
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```js
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// number -> bool
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should_escape(0x202E); // eg. RIGHT-TO-LEFT OVERRIDE => true
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```
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Determine if a character is a combining mark:
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```js
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// number -> bool
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is_combining_mark(0x20E3); // eg. COMBINING ENCLOSING KEYCAP => true
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```
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Format codepoints as print-safe string:
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```js
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// number[] -> string
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safe_str_from_cps([0x300, 0, 32, 97]); // "◌̀{00} a"
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safe_str_from_cps(Array(100).fill(97), 4); // "aa…aa" => middle-truncated
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```
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## Build
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* `git clone` this repo, then `npm install`
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* Follow instructions in [/derive/](./derive/) to generate data files
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* `npm run derive`
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* [spec.json](./derive/output/spec.json)
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* [nf.json](./derive/output/nf.json)
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* [nf-tests.json](./derive/output/nf-tests.json)
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* `npm run make` — compress data files from [/derive/output/](./derive/output/)
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* [include-ens.js](./src/include-ens.js)
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* [include-nf.js](./src/include-nf.js)
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* [include-versions.js](./src/include-versions.js)
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* Follow instructions in [/validate/](./validate/) to generate validation tests
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* `npm run validate`
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* [tests.json](./validate/tests.json)
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* `npm run test` — perform validation tests
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* `npm run build` — create [/dist/](./dist/)
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* `npm run rebuild` — run all the commands above
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* `npm run order` — create optimal group ordering and rebuild again
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## Security
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* [Build](#build) and compare against [include-versions.js](./src/include-versions.js)
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* `spec_hash` — SHA-256 of [spec.json](./derive/output/spec.json) bytes
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* `ens_hash_base64` — SHA-256 of [include-ens.js](./src/include-ens.js) base64 literal
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* `nf_hash_base64` — SHA-256 of [include-nf.js](./src/include-nf.js) base64 literal
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