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  1. d83eb6f Fix insecure URL in readme (#27) by Kevin Moore · 3 weeks ago master 2.1.0-nullsafety
  2. 0834ba5 CI: Test on dev branch (#26) by Kevin Moore · 3 weeks ago
  3. 665e692 update for the 2.10 dev sdk (#25) by Jacob MacDonald · 3 weeks ago
  4. f8f9598 Merge null_safety branch into master (#24) by Jacob MacDonald · 4 weeks ago
  5. 1309eab Tighten type for argument to `evaluate` (#22) by Nate Bosch · 7 months ago 2.0.0

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The boolean_selector package defines a simple and flexible syntax for boolean expressions. It can be used for filtering based on user-defined expressions. For example, the test package uses boolean selectors to allow users to define what platforms their tests support.

The boolean selector syntax is based on a simplified version of Dart's expression syntax. Selectors can contain identifiers, parentheses, and boolean operators, including ||, &&, !, and ? :. Any valid Dart identifier is allowed, and identifiers may also contain hyphens. For example, chrome, chrome || content-shell, and js || (vm && linux) are all valid boolean selectors.

A boolean selector is parsed from a string using BooleanSelector.parse(), and evaluated against a set of variables using BooleanSelector.evaluate(). The variables are supplied as a function that takes a variable name and returns its value. For example:

import 'package:boolean_selector/boolean_selector.dart';

void main(List<String> args) {
  var selector = BooleanSelector.parse("(x && y) || z");
  print(selector.evaluate((variable) => args.contains(variable)));
}

Versioning

If this package adds new features to the boolean selector syntax, it will increment its major version number. This ensures that packages that expose the syntax to their users will be able to update their own minor versions, so their users can indicate that they rely on the new syntax.