Clone this repo:
  1. 1309eab Tighten type for argument to `evaluate` (#22) by Nate Bosch · 5 weeks ago master 2.0.0
  2. e9b2b81 Rename _getNext to _readNext (#20) by Nate Bosch · 2 months ago
  3. 8c4c0f8 Make `accept` a generic method (#21) by Nate Bosch · 2 months ago
  4. 55301c0 Fix newly enforced package:pedantic lints (#19) by Nate Bosch · 2 months ago
  5. 85d0be2 Merge pull request #17 from srawlins/ana-options by Sam Rawlins · 7 months ago

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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 new 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 = new 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.