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[go-ens-normalize](https://github.com/adraffy/go-ens-normalize) to Zig, providing ENS (Ethereum Name Service) domain name normalization according to ENSIP-15 specification.\n\n## Features\n\n- **Zero Dependencies** - No external packages required\n- **100% ENSIP-15 Compliant** - Passes all official validation tests\n- **Embedded Data** - Compressed specification data built into the binary\n- **Thread-Safe** - Singleton pattern with lazy initialization via `std.once()`\n- **Memory Efficient** - Explicit allocator parameters for full control\n- **Unicode 16.0.0** - Latest Unicode standard support\n- **C FFI Compatible** - Full C bindings for interoperability\n- **WebAssembly Ready** - Browser and Node.js WASM support\n\n## Installation\n\n### Using build.zig.zon\n\nAdd to your `build.zig.zon`:\n\n```zig\n.{\n    .name = \"my-project\",\n    .version = \"0.1.0\",\n    .dependencies = .{\n        .z_ens_normalize = .{\n            .url = \"https://github.com/YOUR_USERNAME/z-ens-normalize/archive/refs/tags/v0.1.0.tar.gz\",\n            // Use zig fetch to get the correct hash\n            .hash = \"...\",\n        },\n    },\n}\n```\n\n### In your build.zig\n\n```zig\nconst ens = b.dependency(\"z_ens_normalize\", .{\n    .target = target,\n    .optimize = optimize,\n});\n\nexe.root_module.addImport(\"z_ens_normalize\", ens.module(\"z_ens_normalize\"));\n```\n\n## Quick Start\n\n```zig\nconst std = @import(\"std\");\nconst ens = @import(\"z_ens_normalize\");\n\npub fn main() !void {\n    var gpa = std.heap.GeneralPurposeAllocator(.{}){};\n    defer _ = gpa.deinit();\n    const allocator = gpa.allocator();\n\n    // Normalize a name\n    const normalized = try ens.normalize(allocator, \"Nick.ETH\");\n    defer allocator.free(normalized);\n    std.debug.print(\"Normalized: {s}\\n\", .{normalized});\n    // Output: \"nick.eth\"\n\n    // Beautify a name (preserves emoji presentation)\n    const beautified = try ens.beautify(allocator, \"🚀RaFFY🚴‍♂️.eTh\");\n    defer allocator.free(beautified);\n    std.debug.print(\"Beautified: {s}\\n\", .{beautified});\n    // Output: \"🚀raffy🚴‍♂️.eth\"\n}\n```\n\n## API Reference\n\n### Convenience Functions\n\nThese functions use a thread-safe singleton instance initialized lazily on first use:\n\n#### `normalize(allocator: Allocator, name: []const u8) ![]u8`\n\nNormalizes an ENS name according to ENSIP-15 specification.\n\n**Parameters:**\n- `allocator` - Memory allocator for the result\n- `name` - Input name as UTF-8 bytes\n\n**Returns:** Normalized name (caller owns memory, must free)\n\n**Example:**\n```zig\nconst result = try ens.normalize(allocator, \"VITALIK.eth\");\ndefer allocator.free(result);\n// result: \"vitalik.eth\"\n```\n\n#### `beautify(allocator: Allocator, name: []const u8) ![]u8`\n\nBeautifies an ENS name with visual enhancements while maintaining normalization.\n\n**Differences from normalize():**\n- Preserves FE0F variation selectors for emoji presentation\n- Converts lowercase Greek xi (ξ) to uppercase Xi (Ξ) in non-Greek labels\n- More visually appealing for UI display\n\n**Example:**\n```zig\nconst result = try ens.beautify(allocator, \"🏴‍☠️nick.eth\");\ndefer allocator.free(result);\n// result: \"🏴‍☠️nick.eth\" (with proper emoji presentation)\n```\n\n### Instance Methods\n\nFor more control, you can use the singleton directly or create your own instance:\n\n#### `shared() *const Ensip15`\n\nReturns the thread-safe singleton instance.\n\n```zig\nconst instance = ens.shared();\nconst result = try instance.normalize(allocator, \"test.eth\");\ndefer allocator.free(result);\n```\n\n#### `Ensip15.init(allocator: Allocator) !Ensip15`\n\nCreates a new ENSIP15 normalizer instance.\n\n```zig\nvar normalizer = try ens.Ensip15.init(allocator);\ndefer normalizer.deinit();\n\nconst result = try normalizer.normalize(allocator, \"test.eth\");\ndefer allocator.free(result);\n```\n\n### Error Handling\n\nAll normalization functions return errors for invalid input:\n\n```zig\nconst result = ens.normalize(allocator, \"invalid..name\") catch |err| switch (err) {\n    error.EmptyLabel =\u003e std.debug.print(\"Label cannot be empty\\n\", .{}),\n    error.DisallowedCharacter =\u003e std.debug.print(\"Contains disallowed character\\n\", .{}),\n    error.IllegalMixture =\u003e std.debug.print(\"Illegal script mixture\\n\", .{}),\n    error.WholeConfusable =\u003e std.debug.print(\"Confusable with another name\\n\", .{}),\n    else =\u003e return err,\n};\n```\n\n### Error Types\n\nThe library defines the following error types:\n\n- `InvalidLabelExtension` - Label has `--` at positions 2-3 (e.g., \"ab--test\")\n- `IllegalMixture` - Mixed scripts not allowed together\n- `WholeConfusable` - Label looks like a different script\n- `LeadingUnderscore` - Underscore appears after label start\n- `FencedLeading` - Zero-width joiner at label start\n- `FencedAdjacent` - Adjacent zero-width characters\n- `FencedTrailing` - Zero-width joiner at label end\n- `DisallowedCharacter` - Character not allowed in ENS names\n- `EmptyLabel` - Zero-length label\n- `CMLeading` - Combining mark at label start\n- `CMAfterEmoji` - Combining mark after emoji\n- `NSMDuplicate` - Duplicate non-spacing marks\n- `NSMExcessive` - Too many non-spacing marks\n- `OutOfMemory` - Allocation failure\n- `InvalidUtf8` - Invalid UTF-8 encoding\n\n## Unicode Normalization\n\nThe library also exposes Unicode normalization functions:\n\n```zig\nconst nf = ens.NF.init();\n\n// NFC (Canonical Composition)\nconst composed = try nf.nfc(allocator, \u0026[_]u21{ 0x61, 0x300 }); // \"à\"\ndefer allocator.free(composed);\n\n// NFD (Canonical Decomposition)\nconst decomposed = try nf.nfd(allocator, \u0026[_]u21{ 0xE0 }); // \"a\" + \"̀\"\ndefer allocator.free(decomposed);\n```\n\n## Testing\n\nThe library includes comprehensive test suites:\n\n### Run All Tests\n\n```bash\nzig build test\n```\n\n### Test Categories\n\n1. **ENSIP-15 Validation Tests** (`tests/ensip15_test.zig`)\n   - 100% pass rate on official ENSIP-15 test suite\n   - Tests normalization, beautification, and error cases\n\n2. **Unicode Normalization Tests** (`tests/nf_test.zig`)\n   - 100% pass rate on Unicode normalization test cases\n   - Tests NFC, NFD, and Hangul composition\n\n3. **Initialization Tests** (`tests/init_test.zig`)\n   - Tests data loading from embedded binary\n   - Validates spec.bin and nf.bin decompression\n\n### Test Data\n\nTest data is automatically copied from the reference implementation:\n\n```bash\nzig build copy-test-data\n```\n\nThis downloads:\n- `ensip15-tests.json` - ENSIP-15 validation test cases\n- `nf-tests.json` - Unicode normalization test cases\n\n## C FFI Bindings\n\nThe library provides a complete C API for interoperability with C/C++ and other languages.\n\n### Building C Library\n\n```bash\n# Build C FFI library\nzig build c-lib\n\n# Output: zig-out/lib/libz_ens_normalize_c.a\n# Header: zig-out/include/z_ens_normalize.h\n```\n\n### C API Usage\n\n```c\n#include \u003cstdio.h\u003e\n#include \"z_ens_normalize.h\"\n\nint main(void) {\n    // Initialize library (optional)\n    zens_init();\n\n    // Normalize a name\n    ZensResult result = zens_normalize(\"Nick.ETH\", 0);\n    if (result.error_code == ZENS_SUCCESS) {\n        printf(\"Normalized: %.*s\\n\", (int)result.len, result.data);\n        zens_free(result);\n    } else {\n        printf(\"Error: %s\\n\", zens_error_message(result.error_code));\n    }\n\n    // Cleanup (optional)\n    zens_deinit();\n    return 0;\n}\n```\n\n### Compiling C Programs\n\n```bash\n# Using GCC\ngcc your_program.c -I./zig-out/include -L./zig-out/lib -lz_ens_normalize_c -o your_program\n\n# Using Clang\nclang your_program.c -I./zig-out/include -L./zig-out/lib -lz_ens_normalize_c -o your_program\n```\n\n### C API Reference\n\n#### Functions\n\n**`int32_t zens_init(void)`**\n- Initialize the library (optional but recommended)\n- Returns 0 on success\n\n**`void zens_deinit(void)`**\n- Cleanup library resources\n- Call at program exit\n\n**`ZensResult zens_normalize(const uint8_t *input, size_t input_len)`**\n- Normalize an ENS name\n- `input_len` can be 0 to use strlen()\n- Returns `ZensResult` with normalized name or error\n\n**`ZensResult zens_beautify(const uint8_t *input, size_t input_len)`**\n- Beautify an ENS name with visual enhancements\n- Same parameters as `zens_normalize()`\n\n**`void zens_free(ZensResult result)`**\n- Free memory allocated by normalize/beautify\n- Must be called for successful results\n\n**`const char* zens_error_message(int32_t error_code)`**\n- Get human-readable error message\n- Returns static string (do not free)\n\n#### Error Codes\n\n```c\ntypedef enum {\n    ZENS_SUCCESS = 0,\n    ZENS_ERROR_OUT_OF_MEMORY = -1,\n    ZENS_ERROR_INVALID_UTF8 = -2,\n    ZENS_ERROR_INVALID_LABEL_EXTENSION = -3,\n    ZENS_ERROR_ILLEGAL_MIXTURE = -4,\n    ZENS_ERROR_WHOLE_CONFUSABLE = -5,\n    ZENS_ERROR_LEADING_UNDERSCORE = -6,\n    ZENS_ERROR_DISALLOWED_CHARACTER = -10,\n    ZENS_ERROR_EMPTY_LABEL = -11,\n    // ... more error codes\n} ZensErrorCode;\n```\n\nSee `include/z_ens_normalize.h` for complete API documentation.\n\n## WebAssembly\n\nThe library can be compiled to WebAssembly for use in browsers and Node.js.\n\n### Building WebAssembly\n\n```bash\n# Build for browsers/Node.js (freestanding)\nzig build wasm\n# Output: zig-out/bin/z_ens_normalize.wasm\n\n# Build with WASI support\nzig build wasi\n# Output: zig-out/bin/z_ens_normalize_wasi.wasm\n\n# Build both\nzig build wasm-all\n```\n\n### Browser Usage\n\n```html\n\u003c!DOCTYPE html\u003e\n\u003chtml\u003e\n\u003cbody\u003e\n    \u003cscript type=\"module\"\u003e\n        // Load WASM module\n        const response = await fetch('z_ens_normalize.wasm');\n        const bytes = await response.arrayBuffer();\n        const { instance } = await WebAssembly.instantiate(bytes, {});\n\n        // Initialize\n        instance.exports.zens_init();\n\n        // Helper to encode string\n        const encoder = new TextEncoder();\n        function normalize(name) {\n            const bytes = encoder.encode(name);\n            const ptr = instance.exports.malloc(bytes.length);\n            const memory = new Uint8Array(instance.exports.memory.buffer);\n            memory.set(bytes, ptr);\n\n            const resultPtr = instance.exports.zens_normalize(ptr, bytes.length);\n            // ... read result from memory\n        }\n\n        console.log(normalize(\"Nick.ETH\")); // \"nick.eth\"\n    \u003c/script\u003e\n\u003c/body\u003e\n\u003c/html\u003e\n```\n\n### Node.js Usage\n\n```javascript\nimport { readFile } from 'fs/promises';\n\n// Load WASM\nconst wasmBuffer = await readFile('z_ens_normalize.wasm');\nconst { instance } = await WebAssembly.instantiate(wasmBuffer, {});\n\n// Initialize\ninstance.exports.zens_init();\n\n// Use normalize/beautify functions (see examples/example_node.mjs)\n```\n\n### WASM Examples\n\nComplete examples are provided in the `examples/` directory:\n\n- **`examples/example.html`** - Browser example with interactive UI\n- **`examples/example_node.mjs`** - Node.js example with ES modules\n- **`examples/example.c`** - C API example\n\nRun the examples:\n\n```bash\n# C example\nzig build c-lib\ngcc examples/example.c -I./zig-out/include -L./zig-out/lib -lz_ens_normalize_c -o example\n./example\n\n# Node.js example\nzig build wasm\nnode examples/example_node.mjs\n\n# Browser example\nzig build wasm\n# Serve examples/ directory with HTTP server\npython -m http.server 8000\n# Open http://localhost:8000/examples/example.html\n```\n\n## Build Process\n\n### Standard Build\n\n```bash\n# Build library\nzig build\n\n# Run tests\nzig build test\n\n# Build with optimizations\nzig build -Doptimize=ReleaseFast\n```\n\n### Cross-Compilation\n\n```bash\n# Build for specific target\nzig build -Dtarget=x86_64-linux\n\n# Build static library for all targets\nzig build --summary all\n```\n\n### All Build Targets\n\n```bash\nzig build              # Default library\nzig build test         # Run tests\nzig build c-lib        # C FFI library\nzig build wasm         # WebAssembly (freestanding)\nzig build wasi         # WebAssembly (WASI)\nzig build wasm-all     # All WASM variants\n```\n\n### Development Workflow\n\n1. **Sync with reference implementation:**\n   ```bash\n   # Update test data from go-ens-normalize\n   zig build copy-test-data\n   ```\n\n2. **Run tests:**\n   ```bash\n   zig build test\n   ```\n\n3. **Build library:**\n   ```bash\n   zig build\n   # Output: zig-out/lib/libz_ens_normalize.a\n   ```\n\n## Architecture\n\n### Directory Structure\n\n```\nz-ens-normalize/\n├── src/\n│   ├── root.zig              # Public Zig API \u0026 singleton\n│   ├── root_c.zig            # C FFI bindings\n│   ├── ensip15/\n│   │   ├── ensip15.zig       # Main normalization logic\n│   │   ├── init.zig          # Data initialization\n│   │   ├── types.zig         # Core data structures\n│   │   ├── errors.zig        # Error definitions\n│   │   ├── utils.zig         # Helper utilities\n│   │   └── spec.bin          # Embedded ENSIP-15 data\n│   ├── nf/\n│   │   ├── nf.zig            # Unicode normalization\n│   │   └── nf.bin            # Embedded normalization data\n│   └── util/\n│       ├── decoder.zig       # Binary data decoder\n│       └── runeset.zig       # Efficient rune set\n├── include/\n│   └── z_ens_normalize.h     # C API header\n├── examples/\n│   ├── example.c             # C API example\n│   ├── example.html          # Browser WASM example\n│   └── example_node.mjs      # Node.js WASM example\n├── tests/\n│   ├── ensip15_test.zig      # ENSIP-15 validation tests\n│   ├── nf_test.zig           # Unicode normalization tests\n│   └── init_test.zig         # Initialization tests\n├── test-data/\n│   ├── ensip15-tests.json    # ENSIP-15 test cases\n│   └── nf-tests.json         # NF test cases\n├── build.zig                 # Build configuration\n└── README.md                 # This file\n```\n\n### Development Process\n\nThis library was developed using **AI-assisted implementation** with [Claude Code](https://claude.com/claude-code), following a structured, multi-phase approach:\n\n#### Context \u0026 Specifications\n\n- **`.claude/commands/ens.md`** - Complete ENS specification context including ENSIP-1 (ENS Protocol) and ENSIP-15 (Name Normalization) standards\n- **`prompts/`** - 19 detailed implementation guides (tasks 01-19) providing step-by-step instructions for porting each component from the Go reference implementation\n\n#### Implementation Strategy\n\nThe development followed a **staged approach** outlined in `prompts/00-meta-guide.md`:\n\n**Stage 1: Skeleton Setup** (Tasks 01-19)\n- Created project structure with all type definitions and function signatures\n- Stubbed all logic with `@panic(\"TODO\")` to achieve compilation\n- Result: `zig build` succeeds, tests exist but fail\n\n**Stage 2: Implementation** (Dependency order)\n- Implemented actual logic following the Go reference implementation\n- Three parallel phases:\n  - **Phase 1 (Foundation)**: 8 concurrent tasks - decoder, runeset, types, binaries, test data\n  - **Phase 2 (Core)**: 8 concurrent tasks - NF initialization, normalization, ENSIP15 validation\n  - **Phase 3 (Tests)**: 3 concurrent tasks - test infrastructure for NF and ENSIP15\n- Result: `zig build test` shows 100% pass rate\n\n#### Key Implementation Guides\n\nEach prompt file in `prompts/` includes:\n- Complete Go reference code to port\n- Zig type mappings and patterns\n- Step-by-step implementation guidance\n- Success criteria checklist\n- Validation commands\n\nExample tasks:\n- `01-util-decoder.md` - Binary data decoder for compressed spec files\n- `09-nf-init.md` - Unicode normalization data initialization\n- `13-ensip15-normalize.md` - Core ENSIP-15 normalization pipeline\n- `18-ensip15-tests.md` - Comprehensive validation test suite\n\nThis approach enabled systematic development with clear milestones, parallel workstreams, and automated validation at each stage.\n\n### Memory Management\n\nThe library follows Zig best practices for memory management:\n\n- **Explicit Allocators** - All allocation-requiring functions take `Allocator` parameter\n- **Caller Owns Memory** - Functions return owned slices that must be freed\n- **No Hidden Allocations** - No global allocator usage\n- **Zero-Copy Initialization** - Embedded data is referenced, not copied\n\nExample memory pattern:\n```zig\n// Caller provides allocator and owns result\nconst result = try ens.normalize(allocator, \"test.eth\");\ndefer allocator.free(result); // Caller frees memory\n\n// Internal operations use the provided allocator\n// No global state or hidden allocations\n```\n\n## Performance\n\nThe library is designed for efficiency:\n\n- **Compressed Data** - Spec data is bit-packed and compressed\n- **Embedded Binary** - No file I/O at runtime\n- **Lazy Initialization** - Singleton initialized only when first used\n- **Zero-Copy Where Possible** - References embedded data directly\n\n## Compatibility\n\n- **Zig Version:** 0.13.0 or later\n- **Unicode Version:** 16.0.0\n- **ENSIP-15:** Final specification\n- **Reference Implementation:** [go-ens-normalize](https://github.com/adraffy/go-ens-normalize) v0.1.1\n\n## Contributing\n\nContributions are welcome! This implementation aims to maintain 100% compatibility with the reference Go implementation.\n\n### Development Guidelines\n\n1. Run tests before submitting PR: `zig build test`\n2. Follow Zig style conventions\n3. Add tests for new functionality\n4. Update documentation as needed\n\n## License\n\nMIT License - see LICENSE file for details\n\n## Credits\n\n- **Reference Implementation:** [adraffy/go-ens-normalize](https://github.com/adraffy/go-ens-normalize)\n- **JavaScript Reference:** [adraffy/ens-normalize.js](https://github.com/adraffy/ens-normalize.js)\n- **ENSIP-15 Specification:** [ENS Improvement Proposals](https://docs.ens.domains/ensip/15)\n- **Zig Port:** William Cory\n\n## Resources\n\n- [ENSIP-15 Specification](https://docs.ens.domains/ensip/15)\n- [ENS Documentation](https://docs.ens.domains/)\n- [Unicode Technical Report #15](https://unicode.org/reports/tr15/) (Normalization Forms)\n- [Unicode Technical Report #46](https://unicode.org/reports/tr46/) (IDNA Compatibility)\n- [Zig Language Reference](https://ziglang.org/documentation/master/)\n\n## Support\n\n- **Issues:** [GitHub Issues](https://github.com/YOUR_USERNAME/z-ens-normalize/issues)\n- **ENS Discord:** [discord.gg/ensdomains](https://discord.gg/ensdomains)\n\n---\n\nBuilt with [Zig](https://ziglang.org/) 🦎\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fevmts%2Fz-ens-normalize","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fevmts%2Fz-ens-normalize","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fevmts%2Fz-ens-normalize/lists"}