ADRaffy.ENSNormalize 0.1.2

ENSNormalize.cs

0-dependency ENSIP-15 in C#

• Reference Implementation: @adraffy/ens-normalize.js
  • Unicode: 15.0.0
  • Spec: 962316964553fce6188e25a5166a4c1e906333adf53bdf2964c71dedc0f8e2c8
• Passes 100% Validation Tests
• Passes 100% Normalization Tests
• Space Efficient: ~60KB as Inline Blobs via make.js
• Legacy Support: netstandard1.1, net451, netcoreapp3.1

using ADRaffy.ENSNormalize;
ENSNormalize.ENSIP15 // Main Library (global instance)

Primary API ENSIP15

// string -> string
// throws on invalid names
ENSNormalize.ENSIP15.Normalize("RaFFY🚴‍♂️.eTh"); // "raffy🚴‍♂.eth"

// works like Normalize()
ENSNormalize.ENSIP15.Beautify("1⃣2⃣.eth"); // "1️⃣2️⃣.eth"

Output-based Tokenization Label

// string -> Label[]
// never throws
Label[] labels = ENSNormalize.ENSIP15.Split("💩Raffy.eth_");
// [
//   Label {
//     Input: [ 128169, 82, 97, 102, 102, 121 ],  
//     Tokens: [
//       OutputToken { Codepoints: [ 128169 ], IsEmoji: true }
//       OutputToken { Codepoints: [ 114, 97, 102, 102, 121 ] }
//     ],
//     Normalized: [ 128169, 114, 97, 102, 102, 121 ],
//     Group: Group { Name: "Latin", ... }
//   },
//   Label {
//     Input: [ 101, 116, 104, 95 ],
//     Tokens: [ 
//       OutputToken { Codepoints: [ 101, 116, 104, 95 ] }
//     ],
//     Error: NormError { Kind: "underscore allowed only at start" }
//   }
// ]

// string -> Label
// never throws
Label label = ENSNormalize.ENSIP15.NormalizeLabel("ABC");
// note: this throws on "."

Normalization Properties

• Group — ENSIP15.Groups: IReadOnlyList<Group>
• EmojiSequence — ENSIP15.Emojis: IReadOnlyList<EmojiSequence>
• Whole — ENSIP15.Wholes: IReadOnlyList<Whole>

Error Handling

All errors are safe to print. Functions that accept names as input wrap their exceptions in InvalidLabelException for additional context.

Errors with Additional Context

• (Base) NormException { Kind: string, Reason: string? }
• DisallowedCharacterException { Codepoint }
• ConfusableException { Group, OtherGroup }
• IllegalMixtureException { Codepoint, Group, OtherGroup? }

Error Kinds

• "empty label"
• "duplicate non-spacing marks"
• "excessive non-spacing marks"
• "leading fenced"
• "adjacent fenced"
• "trailing fenced"
• "leading combining mark"
• "emoji + combining mark"
• "invalid label extension"
• "underscore allowed only at start"
• "illegal mixture"
• "whole-script confusable"
• "disallowed character"

Utilities

Normalize name fragments for substring search:

// string -> string
// only throws InvalidLabelException w/DisallowedCharacterException
ENSIP15.NormalizeFragment("AB--");
ENSIP15.NormalizeFragment("..\u0300");
ENSIP15.NormalizeFragment("\u03BF\u043E");
// note: Normalize() throws on these

Construct safe strings:

// int -> string
ENSIP15.SafeCodepoint(0x303); // "◌̃"
// IReadOnlyList<int> -> string
ENSIP15.SafeImplode(new int[]{ 0x303, 0xFE0F }); // "◌̃{FE0F}"

Determine if a character shouldn't be printed directly:

// IReadOnlyCollection<int>
ENSIP15.ShouldEscape.Contains(0x202E); // RIGHT-TO-LEFT OVERRIDE => true

Determine if a character is a combining mark:

// IReadOnlyCollection<int>
ENSNormalize.ENSIP15.CombiningMarks.Contains(0x20E3); // COMBINING ENCLOSING KEYCAP => true

Unicode Normalization Forms NF

using ADRaffy.ENSNormalize;

// string -> string 
// IEnumerable<int> -> int[]
ENSNormalize.NF.NFC("\x65\u0300"); // [E5]
ENSNormalize.NF.NFD("\xE5"); // [65 300]