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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 com.google.common.css.compiler.ast.CssSelectorNode.Specificity;

/**
 * A {@link CssRefinerNode} implementation that represents an attribute
 * selector. For example: {@code [hreflang|="en"]}
 *
 * @author [email protected] (Florian Benz)
 */
public class CssAttributeSelectorNode extends CssRefinerNode {
    /**
     * Indicates which kind of attribute selector is used.
     */
    private final MatchType matchType;
    private final String attributeName;
    private final CssValueNode value;

    /**
     * Determines how the given value has to match the value of the attribute so
     * that the attribute is selected.
     */
    public enum MatchType {
        ANY(""),                // [attr]
        EXACT("="),             // [attr=val]
        ONE_WORD("~="),         // [attr~=val]
        EXACT_OR_DASH("|="),    // [attr|=val]
        PREFIX("^="),           // [attr^=val]
        SUFFIX("$="),           // [attr$=val]
        CONTAINS("*=");         // [attr*=val]

        private final String symbol;

        MatchType(String symbol) {
            this.symbol = symbol;
        }

        public String getSymbol() {
            return symbol;
        }
    }

    public CssAttributeSelectorNode(MatchType matchType, String attributeName,
                                    CssValueNode value, SourceCodeLocation sourceCodeLocation) {
        super(Refiner.ATTRIBUTE, "", sourceCodeLocation);
        this.matchType = matchType;
        this.attributeName = attributeName;
        this.value = value;
    }

    protected CssAttributeSelectorNode(CssAttributeSelectorNode node) {
        this(node.matchType, node.attributeName, node.value,
                node.getSourceCodeLocation());
    }

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

    public MatchType getMatchType() {
        return matchType;
    }

    public String getMatchSymbol() {
        return matchType.getSymbol();
    }

    public String getAttributeName() {
        return attributeName;
    }

    public CssValueNode getValue() {
        return value;
    }

    @Override
    public Specificity getSpecificity() {
        // c++ (c = the number of class selectors, attributes selectors,
        // and pseudo-classes in the selector)
        return new Specificity(0, 1, 0);
    }
}