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This is [Unicode Normalizer] in a Common JS module. I'm not affiliated with Matsuza, the original author of Unicode Normalizer.
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[](https://travis-ci.org/walling/unorm)
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Installation
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------------
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```bash
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npm install unorm
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```
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Polyfill
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--------
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You can use this module as a polyfill for [String.prototype.normalize], for example:
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```javascript
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console.log('æøåäüö'.normalize('NFKD'));
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```
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The module uses some [EcmaScript 5](http://kangax.github.io/es5-compat-table/) features. Other browsers should use a compability shim, e.g. [es5-shim](https://github.com/kriskowal/es5-shim).
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Functions
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---------
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This module exports four functions: `nfc`, `nfd`, `nfkc`, and `nfkd`; one for each Unicode normalization. In the browser the functions are exported in the `unorm` global. In CommonJS environments you just require the module. Functions:
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* `unorm.nfd(str)` – Canonical Decomposition
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* `unorm.nfc(str)` – Canonical Decomposition, followed by Canonical Composition
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* `unorm.nfkd(str)` – Compatibility Decomposition
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* `unorm.nfkc(str)` – Compatibility Decomposition, followed by Canonical Composition
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Node.JS example
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---------------
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For a longer example, see `examples` directory.
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```javascript
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var unorm = require('unorm');
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var text =
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'The \u212B symbol invented by A. J. \u00C5ngstr\u00F6m ' +
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'(1814, L\u00F6gd\u00F6, \u2013 1874) denotes the length ' +
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'10\u207B\u00B9\u2070 m.';
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var combining = /[\u0300-\u036F]/g; // Use XRegExp('\\p{M}', 'g'); see example.js.
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console.log('Regular: ' + text);
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console.log('NFC: ' + unorm.nfc(text));
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console.log('NFD: ' + unorm.nfd(text));
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console.log('NFKC: ' + unorm.nfkc(text));
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console.log('NFKD: * ' + unorm.nfkd(text).replace(combining, ''));
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console.log(' * = Combining characters removed from decomposed form.');
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```
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Road map
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--------
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As of November 2013. Longer term:
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- Look at possible optimizations (speed primarely, module size secondarily)
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- Adding functions to quick check normalizations: `is_nfc`, `is_nfd`, etc.
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Contributers
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------------
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- **Oleg Grenrus** is helping to maintain this library. He cleaned up the code base, fixed JSHint errors, created a test suite and updated the normalization data to Unicode 6.3.
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Development notes
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-----------------
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- [Unicode normalization forms report](http://www.unicode.org/reports/tr15/)
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- Unicode data can be found from http://www.unicode.org/Public/UCD/latest/ucd
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To generate new unicode data, run:
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```sh
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cd src/data/src
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javac UnormNormalizerBuilder.java
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java UnormNormalizerBuilder
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```
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produced `unormdata.js` contains needed table
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Execute `node benchmark/benchmark.js` to run simple benchmarks, if you do any changes which may affect performance.
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License
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-------
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This project includes the software package **Unicode Normalizer 1.0.0**. The
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software dual licensed under the MIT and GPL licenses. Here is the MIT license:
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Copyright (c) 2008-2013 Matsuza <matsuza@gmail.com>, Bjarke Walling <bwp@bwp.dk>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to
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deal in the Software without restriction, including without limitation the
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rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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sell copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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IN THE SOFTWARE.
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[Unicode Normalizer]: http://coderepos.org/share/browser/lang/javascript/UnicodeNormalizer
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[String.prototype.normalize]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String/normalize
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