Unit Test

Unicode 8.0 Normalization - NFC, NFD, NFKC, NFKD

Dart2 port of unorm


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:

  • unorm.nfd(str) – Canonical Decomposition
  • unorm.nfc(str) – Canonical Decomposition, followed by Canonical Composition
  • unorm.nfkd(str) – Compatibility Decomposition
  • unorm.nfkc(str) – Compatibility Decomposition, followed by Canonical Composition


A simple usage example:

import "package:unorm_dart/unorm_dart.dart" as unorm;

void main() {
  var text = "The \u212B symbol invented by A. J. \u00C5ngstr\u00F6m " +
      "(1814, L\u00F6gd\u00F6, \u2013 1874) denotes the length " +
      "10\u207B\u00B9\u2070 m.";

  var combining = RegExp(r"[\u0300-\u036F]/g");

  print("Regular:  ${text}");
  print("NFC:      ${unorm.nfc(text)}");
  print("NFKC:     ${unorm.nfkc(text)}");
  print("NFKD: *   ${unorm.nfkd(text).replaceAll(combining, "")}");
  print(" * = Combining characters removed from decomposed form.");

Generating Unicode data

see yshrsmz/unorm-dart-data-generator.

Features and bugs

Please file feature requests and bugs at the issue tracker.


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