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# ens-normalize.js
0-dependancy [Ethereum Name Service](https://ens.domains/) (ENS) Name Normalizer.
* 🏛️ Follows [ENSIP-15: ENS Name Normalization Standard](https://docs.ens.domains/ens-improvement-proposals/ensip-15-normalization-standard)
* Other implementations:
* Python — [namehash/ens-normalize-python](https://github.com/namehash/ens-normalize-python)
* C# — [adraffy/ENSNormalize.cs](https://github.com/adraffy/ENSNormalize.cs)
* Java — [adraffy/ENSNormalize.java](https://github.com/adraffy/ENSNormalize.java)
* Javascript — [ensdomains/eth-ens-namehash](https://github.com/ensdomains/eth-ens-namehash)
* [Breakdown Reports from ENSIP-1](https://adraffy.github.io/ens-norm-tests/test-breakdown/output-20230226/)
* ✅️ Passes **100%** [ENSIP-15 Validation Tests](https://adraffy.github.io/ens-normalize.js/test/validate.html)
* ✅️ Passes **100%** [Unicode Normalization Tests](https://adraffy.github.io/ens-normalize.js/test/report-nf.html)
* Minified File Sizes:
* [`28KB`](./dist/index-xnf.min.js) — native `NFC` via [nf-native.js](./src/nf-native.js) using `String.normalize()` ⚠️
* [`37KB` **Default**](./dist/index.min.js) — custom `NFC` via [nf.js](./src/nf.js)
* [`43KB`](./dist/all.min.js) *Everything!* — custom `NFC` + sub-libraries: [parts.js](./src/parts.js), [utils.js](./src/utils.js)
* Included Apps:
* [**Resolver Demo**](https://adraffy.github.io/ens-normalize.js/test/resolver.html) ⭐
* [Supported Emoji](https://adraffy.github.io/ens-normalize.js/test/emoji.html)
* [Character Viewer](https://adraffy.github.io/ens-normalize.js/test/chars.html)
* [Confused Explainer](https://adraffy.github.io/ens-normalize.js/test/confused.html)
* Related Projects:
* [Recent .eth Registrations](https://raffy.antistupid.com/eth/ens-regs.html) • [.eth Renews](https://raffy.antistupid.com/eth/ens-renews.html)
* [.eth Expirations](https://raffy.antistupid.com/eth/ens-exp.html)
* [Emoji Frequency Explorer](https://raffy.antistupid.com/eth/ens-emoji-freq.html)
* [ENS+NFT Matcher](https://raffy.antistupid.com/eth/ens-nft-matcher.html)
* [Batch Resolver](https://raffy.antistupid.com/eth/ens-batch-resolver.html)
* [Label Database](https://github.com/adraffy/ens-labels/) • [Labelhash⁻¹](https://adraffy.github.io/ens-labels/demo.html)
* [adraffy/punycode.js](https://github.com/adraffy/punycode.js/) • [Punycode Coder](https://adraffy.github.io/punycode.js/test/demo.html)
* [adraffy/keccak.js](https://github.com/adraffy/keccak.js/) • [Keccak Hasher](https://adraffy.github.io/keccak.js/test/demo.html)
* [adraffy/emoji.js](https://github.com/adraffy/emoji.js/) • [Emoji Parser](https://adraffy.github.io/emoji.js/test/demo.html)
```js
import {ens_normalize} from '@adraffy/ens-normalize'; // or require()
// npm i @adraffy/ens-normalize
// browser: https://cdn.jsdelivr.net/npm/@adraffy/ens-normalize@latest/dist/index.min.mjs (or .cjs)
// *** ALL errors thrown by this library are safe to print ***
// - characters are shown as {HEX} if should_escape()
// - potentially different bidi directions inside "quotes"
// - 200E is used near "quotes" to prevent spillover
// - an "error type" can be extracted by slicing up to the first (:)
// - labels are middle-truncated with ellipsis (…) at 63 cps
// string -> string
// throws on invalid names
// output ready for namehash
let normalized = ens_normalize('RaFFY🚴♂️.eTh');
// => "raffy🚴♂.eth"
// note: does not enforce .eth registrar 3-character minimum
```
Format names with fully-qualified emoji:
```js
// works like ens_normalize()
// output ready for display
let pretty = ens_beautify('1⃣2⃣.eth');
// => "1️⃣2️⃣.eth"
// note: normalization is unchanged:
// ens_normalize(ens_beautify(x)) == ens_normalize(x)
```
Normalize name fragments for [substring search](./test/fragment.js):
```js
// these fragments fail ens_normalize()
// but will normalize fine as fragments
let frag1 = ens_normalize_fragment('AB--'); // expected error: label ext
let frag2 = ens_normalize_fragment('\u{303}'); // expected error: leading cm
let frag3 = ens_normalize_fragment('οо'); // expected error: mixture
```
Input-based tokenization:
```js
// string -> Token[]
// never throws
let tokens = ens_tokenize('_R💩\u{FE0F}a\u{FE0F}\u{304}\u{AD}./');
// [
// { type: 'valid', cp: [ 95 ] }, // valid (as-is)
// {
// type: 'mapped',
// cp: 82, // input
// cps: [ 114 ] // output
// },
// {
// type: 'emoji',
// input: Emoji(2) [ 128169, 65039 ], // input
// emoji: [ 128169, 65039 ], // fully-qualified
// cps: Emoji(1) [ 128169 ] // output (normalized)
// },
// {
// type: 'nfc',
// input: [ 97, 772 ], // input (before nfc)
// tokens0: [ // tokens (before nfc)
// { type: 'valid', cps: [ 97 ] },
// { type: 'ignored', cp: 65039 },
// { type: 'valid', cps: [ 772 ] }
// ],
// cps: [ 257 ], // output (after nfc)
// tokens: [ // tokens (after nfc)
// { type: 'valid', cps: [ 257 ] }
// ]
// },
// { type: 'ignored', cp: 173 },
// { type: 'stop', cp: 46 },
// { type: 'disallowed', cp: 47 }
// ]
// note: if name is normalizable, then:
// ens_normalize(ens_tokenize(name).map(token => {
// ** convert valid/mapped/nfc/stop to string **
// }).join('')) == ens_normalize(name)
```
Output-based tokenization:
```js
// string -> Label[]
// never throws
let labels = ens_split('💩Raffy.eth_');
// [
// {
// input: [ 128169, 82, 97, 102, 102, 121 ],
// offset: 0, // index of codepoint, not substring index!
// // (corresponding length can be inferred from input)
// tokens: [
// Emoji(2) [ 128169, 65039 ], // emoji
// [ 114, 97, 102, 102, 121 ] // nfc-text
// ],
// output: [ 128169, 114, 97, 102, 102, 121 ],
// emoji: true,
// type: 'Latin'
// },
// {
// input: [ 101, 116, 104, 95 ],
// offset: 7,
// tokens: [ [ 101, 116, 104, 95 ] ],
// output: [ 101, 116, 104, 95 ],
// error: Error('underscore allowed only at start')
// }
// ]
```
Generate a sorted array of (beautified) supported emoji codepoints:
```js
// () -> number[][]
let emojis = ens_emoji();
// [
// [ 2764 ],
// [ 128169, 65039 ],
// [ 128105, 127997, 8205, 9877, 65039 ],
// ...
// ]
```
Determine if a character shouldn't be printed directly:
```js
// number -> bool
should_escape(0x202E); // eg. RIGHT-TO-LEFT OVERRIDE => true
```
Determine if a character is a combining mark:
```js
// number -> bool
is_combining_mark(0x20E3); // eg. COMBINING ENCLOSING KEYCAP => true
```
Format codepoints as print-safe string:
```js
// number[] -> string
safe_str_from_cps([0x300, 0, 32, 97]); // "◌̀{00} a"
safe_str_from_cps(Array(100).fill(97), 4); // "aa…aa" => middle-truncated
```
## Build
* `git clone` this repo, then `npm install`
* Follow instructions in [/derive/](./derive/) to generate data files
* `npm run derive`
* [spec.json](./derive/output/spec.json)
* [nf.json](./derive/output/nf.json)
* [nf-tests.json](./derive/output/nf-tests.json)
* `npm run make` — compress data files from [/derive/output/](./derive/output/)
* [include-ens.js](./src/include-ens.js)
* [include-nf.js](./src/include-nf.js)
* [include-versions.js](./src/include-versions.js)
* Follow instructions in [/validate/](./validate/) to generate validation tests
* `npm run validate`
* [tests.json](./validate/tests.json)
* `npm run test` — perform validation tests
* `npm run build` — create [/dist/](./dist/)
* `npm run rebuild` — run all the commands above
* `npm run order` — create optimal group ordering and rebuild again
### Publishing to NPM
This project uses `.js` instead of `.mjs` so [package.json](./package.json) uses `type: module`. To avoid bundling issues, `type` is [dropped during packing](./src/prepost.js). `pre/post` hooks aren't used because they're buggy.
* `npm run pack` instead of `npm pack`
* `npm run pub` instead of `npm publish`
## Security
* [Build](#build) and compare against [include-versions.js](./src/include-versions.js)
* `spec_hash` — SHA-256 of [spec.json](./derive/output/spec.json) bytes
* `base64_ens_hash` — SHA-256 of [include-ens.js](./src/include-ens.js) base64 literal
* `base64_nf_hash` — SHA-256 of [include-nf.js](./src/include-nf.js) base64 literal
Выполнить команду
Для локальной разработки. Не используйте в интернете!