// Copyright 2019 The Nomulus Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package google.registry.util;

import com.google.common.base.CharMatcher;

/**
 * Creates {@link CharMatcher CharMatchers} that support Java character strings only, not unicode
 * supplementary characters.
 */
public class JavaCharMatchers {

  /** Returns a {@link CharMatcher} that matcher only ASCII letters and digits. */
  public static CharMatcher asciiLetterOrDigitMatcher() {
    return CharMatcher.inRange('0', '9')
        .or(CharMatcher.inRange('a', 'z'))
        .or(CharMatcher.inRange('A', 'Z'));
  }

  private JavaCharMatchers() {}
}
