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# ENSNormalize.cs
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0-dependency [ENSIP-15](https://docs.ens.domains/ens-improvement-proposals/ensip-15-normalization-standard) in C#
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* Reference Implementation: [@adraffy/ens-normalize.js](https://github.com/adraffy/ens-normalize.js)
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* Unicode: `15.0.0`
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* Spec Hash: [`962316964553fce6188e25a5166a4c1e906333adf53bdf2964c71dedc0f8e2c8`](https://github.com/ensdomains/docs/blob/master/ens-improvement-proposals/ensip-15/spec.json)
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* Passes **100%** [ENSIP-15 Validation Tests](https://github.com/ensdomains/docs/blob/master/ens-improvement-proposals/ensip-15/tests.json)
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* Passes **100%** [Unicode Normalization Tests](https://unicode.org/Public/15.0.0/ucd/NormalizationTest.txt)
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* Space Efficient: `~58KB .dll` using [Inline Blobs](./ENSNormalize/Blobs.cs) via [make.js](./Compress/make.js)
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* Legacy Support: `netstandard1.1`, `net35`, `netcoreapp3.1`
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* Nuget Repository: [](https://badge.fury.io/nu/ADRaffy.ENSNormalize)
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```c#
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using ADRaffy.ENSNormalize;
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ENSNormalize.ENSIP15 // Main Library (global instance)
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```
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### Primary API [ENSIP15](./ENSNormalize/ENSIP15.cs)
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```c#
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// string -> string
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// throws on invalid names
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ENSNormalize.ENSIP15.Normalize("RaFFY🚴♂️.eTh"); // "raffy🚴♂.eth"
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// works like Normalize()
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ENSNormalize.ENSIP15.Beautify("1⃣2⃣.eth"); // "1️⃣2️⃣.eth"
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```
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### Additional [NormDetails](./ENSNormalize/NormDetails.cs) (Experimental)
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```c#
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// works like Normalize(), throws on invalid names
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// string -> NormDetails
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NormDetails details = ENSNormalize.ENSIP15.NormalizeDetails("💩ì.a");
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string Name; // normalized name
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bool PossiblyConfusing; // if name should be carefully reviewed
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string GroupDescription = "Latin+Emoji"; // group summary for name
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HashSet<Group> Groups; // unique groups in name
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HashSet<EmojiSequence> Emojis; // unique emoji in name
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bool HasZWJEmoji; // if any emoji contain 200D
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```
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### Output-based Tokenization [Label](./ENSNormalize/Label.cs)
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```c#
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// string -> Label[]
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// never throws
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Label[] labels = ENSNormalize.ENSIP15.Split("💩Raffy.eth_");
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// [
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// Label {
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// Input: [ 128169, 82, 97, 102, 102, 121 ],
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// Tokens: [
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// OutputToken { Codepoints: [ 128169 ], IsEmoji: true }
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// OutputToken { Codepoints: [ 114, 97, 102, 102, 121 ] }
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// ],
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// Normalized: [ 128169, 114, 97, 102, 102, 121 ],
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// Group: Group { Name: "Latin", ... }
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// },
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// Label {
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// Input: [ 101, 116, 104, 95 ],
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// Tokens: [
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// OutputToken { Codepoints: [ 101, 116, 104, 95 ] }
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// ],
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// Error: NormException { Kind: "underscore allowed only at start" }
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// }
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// ]
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```
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### Normalization Properties
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* [Group](./ENSNormalize/Group.cs) — `ENSIP15.Groups: IList<Group>`
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* [EmojiSequence](./ENSNormalize/EmojiSequence.cs) — `ENSIP15.Emojis: IList<EmojiSequence>`
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* [Whole](./ENSNormalize/Whole.cs) — `ENSIP15.Wholes: IList<Whole>`
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### Error Handling
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All errors are safe to print. [NormException](./ENSNormalize/NormException.cs) `{ Kind: string, Reason: string? }` is the base exception. Functions that accept names as input wrap their exceptions in [InvalidLabelException](./ENSNormalize/InvalidLabelException.cs) `{ Label: string, Error: NormException }` for additional context.
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* `"disallowed character"` — [DisallowedCharacterException](./ENSNormalize/DisallowedCharacterException.cs) `{ Codepoint }`
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* `"illegal mixture"` — [IllegalMixtureException](./ENSNormalize/IllegalMixtureException.cs) `{ Codepoint, Group, OtherGroup? }`
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* `"whole-script confusable"` — [ConfusableException](./ENSNormalize/ConfusableException.cs) `{ Group, OtherGroup }`
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* `"empty label"`
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* `"duplicate non-spacing marks"`
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* `"excessive non-spacing marks"`
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* `"leading fenced"`
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* `"adjacent fenced"`
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* `"trailing fenced"`
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* `"leading combining mark"`
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* `"emoji + combining mark"`
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* `"invalid label extension"`
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* `"underscore allowed only at start"`
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### Utilities
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Normalize name fragments for substring search:
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```c#
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// string -> string
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// only throws InvalidLabelException w/DisallowedCharacterException
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ENSNormalize.ENSIP15.NormalizeFragment("AB--");
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ENSNormalize.ENSIP15.NormalizeFragment("..\u0300");
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ENSNormalize.ENSIP15.NormalizeFragment("\u03BF\u043E");
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// note: Normalize() throws on these
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```
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Construct safe strings:
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```c#
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// int -> string
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ENSNormalize.ENSIP15.SafeCodepoint(0x303); // "◌̃"
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ENSNormalize.ENSIP15.SafeCodepoint(0xFE0F); // "{FE0F}"
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// IList<int> -> string
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ENSNormalize.ENSIP15.SafeImplode(new int[]{ 0x303, 0xFE0F }); // "◌̃{FE0F}"
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```
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Determine if a character shouldn't be printed directly:
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```c#
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// ReadOnlyIntSet (like IReadOnlySet<int>)
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ENSNormalize.ENSIP15.ShouldEscape.Contains(0x202E); // 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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```c#
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// ReadOnlyIntSet
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ENSNormalize.ENSIP15.CombiningMarks.Contains(0x20E3); // COMBINING ENCLOSING KEYCAP => true
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```
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### Unicode Normalization Forms [NF](./ENSNormalize/NF.cs)
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```c#
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using ADRaffy.ENSNormalize;
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// string -> string
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ENSNormalize.NF.NFC("\x65\u0300"); // "\xE8"
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ENSNormalize.NF.NFD("\xE8"); // "\x65\u0300"
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// IEnumerable<int> -> List<int>
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ENSNormalize.NF.NFC(new int[]{ 0x65, 0x300 }); // [0xE8]
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ENSNormalize.NF.NFD(new int[]{ 0xE8 }); // [0x65, 0x300]
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```
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