sdk/lib/_internal/pub/lib/src/validator/sdk_constraint.dart

// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

library pub.validator.sdk_constraint;

import 'dart:async';

import 'package:pub_semver/pub_semver.dart';

import '../entrypoint.dart';
import '../log.dart' as log;
import '../package.dart';
import '../validator.dart';

/// A validator that validates that a package's SDK constraint doesn't use the
/// "^" syntax.
class SdkConstraintValidator extends Validator {
  SdkConstraintValidator(Entrypoint entrypoint)
    : super(entrypoint);

  Future validate() async {
    var constraint = entrypoint.root.pubspec.environment.sdkVersion;
    if (!constraint.toString().startsWith("^")) return;

    errors.add(
        "^ version constraints aren't allowed for SDK constraints since "
          "older versions of pub don't support them.\n"
        "Expand it manually instead:\n"
        "\n"
        "environment:\n"
        "  sdk: \">=${constraint.min} <${constraint.max}\"");
  }
}