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Closure Stylesheets is an extension to CSS that adds variables, functions, conditionals, and mixins to standard CSS. The tool also supports minification, linting, RTL flipping, and CSS class renaming.

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/*
 * Copyright 2006 Google Inc.
 *
 * 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 com.google.common.css;

/**
 * An interface for a one-to-one string mapping function.
 */
public interface SubstitutionMap {

  /**
   * Gets the string that should be substituted for {@code key}. The same
   * value must be consistently returned for any particular {@code key}, and
   * the returned value must not be returned for any other {@code key} value.
   *
   * @param key  the text to be replaced (never null)
   * @return the value to substitute for {@code key}
   */
  String get(String key);
}