characters

• Run dart format with the new style.
• Performance improvement for non-BMP characters.

• Run dart format with the new style.
• Performance improvement for non-BMP characters.

update the pubspec version of package:collection (#730)

• Updated to use Unicode 16.0.0.

• Fixed README rendering on pub.dev and API docs.
• Require Dart ^3.4.0.
• Move to dart-lang/core monorepo.

• Updated to use Unicode 15.0.0.

• Update the value of the pubspec repository field.

• Fix Characters.where which unnecessarily did the iteration and test twice.
• Adds Characters.empty constant and makes Characters("") return it.
• Changes the argument type of Characters.contains to (covariant) String. The implementation still accepts Object?, so it can be cast to Iterable<Object?>, but you get warned if you try to call directly with a non-String.

• Stable release for null safety.
• Added stringBeforeLength and stringAfterLength to CharacterRange.
• Added CharacterRange.at constructor.
• Added getRange(start, end) and characterAt(pos) to Characters as alternative to .take(end).skip(start) and getRange(pos, pos + 1).
• Change some positional parameter names from other to characters.

• Core APIs deemed stable; package version set to 1.0.0.
• Added split methods on Characters and CharacterRange.

• Change [codeUnits] getter to [utf16CodeUnits] which returns an iterable. This avoids leaking that the underlying string has efficient UTF-16 code unit access in the API, and allows the same interface to be just as efficiently implemented on top of UTF-8.

• Added an extension method on String to allow easy access to the Characters of the string:

  print('The first character is: ' + myString.characters.first)
  

• Updated Dart SDK dependency to Dart 2.6.0

• Added small example in example/main.dart
• Enabled pedantic lints and updated code to resolve issues.

• Updated API which does not expose the underlying string indices.