boolean_selector 2.0.0
boolean_selector: ^2.0.0
boolean_selector: ^2.1.0-nullsafety.3

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A flexible syntax for boolean expressions, based on a simplified version of Dart's expression syntax.

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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.

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A flexible syntax for boolean expressions, based on a simplified version of Dart's expression syntax.

Repository (GitHub)
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Documentation

API reference

Uploaders

nweiz@google.com
kevmoo@google.com
nbosch@google.com
jakemac@google.com

License

BSD (LICENSE)

Dependencies

source_span, string_scanner

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Packages that depend on boolean_selector