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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 2011 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.compiler.ast;

import com.google.common.css.SourceCodeLocation;

import javax.annotation.Nullable;

/**
 * A node representing a key (for keyframes) in the AST.
 * A key is used to represent a position in an animation and can be a expressed
 * with percentage ranging from 0% to 100%, or by from (= 0%), or
 * to (= 100%).
 * For example: 0%, 33.3% { ... }
 *
 * @author [email protected] (Florian Benz)
 */
public class CssKeyNode extends CssNode implements ChunkAware {
    /**
     * Value of the key held by this node.
     */
    private String keyValue;
    /**
     * The chunk this key belongs to.
     */
    private Object chunk;

    /**
     * Constructor of a key node.
     *
     * @param keyValue
     * @param sourceCodeLocation
     */
    public CssKeyNode(@Nullable String keyValue,
                      @Nullable SourceCodeLocation sourceCodeLocation) {
        super(sourceCodeLocation);
        this.keyValue = keyValue;
    }

    /**
     * Constructor of a key node.
     *
     * @param keyValue
     */
    public CssKeyNode(String keyValue) {
        this(keyValue, null);
    }

    /**
     * Copy-constructor of a key node.
     *
     * @param node
     */
    public CssKeyNode(CssKeyNode node) {
        this(node.getKeyValue(), node.getSourceCodeLocation());
        this.chunk = node.getChunk();
    }

    @Override
    public CssKeyNode deepCopy() {
        return new CssKeyNode(this);
    }

    public void setKeyValue(String keyValue) {
        this.keyValue = keyValue;
    }

    public String getKeyValue() {
        return keyValue;
    }

    @Override
    public void setChunk(Object chunk) {
        this.chunk = chunk;
    }

    @Override
    public Object getChunk() {
        return chunk;
    }

    /**
     * For debugging only.
     */
    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        if (keyValue != null) {
            sb.append(keyValue);
        }
        return sb.toString();
    }
}