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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 2012 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.passes;

import com.google.common.collect.Maps;
import com.google.common.css.compiler.ast.CssNode;
import com.google.common.css.compiler.ast.CssTree;

import java.util.Map;

/**
 * A visitor that maps nodes to their visit ordering.
 */
public class EnumeratingVisitor implements UniformVisitor {

    private int counter;
    private final Map enumeration = Maps.newHashMap();

    @Override
    public void enter(CssNode node) {
        enumeration.put(node, counter);
        ++counter;
    }

    @Override
    public void leave(CssNode node) {
    }

    public static Map enumerate(CssTree t) {
        EnumeratingVisitor v = new EnumeratingVisitor();
        t.getVisitController().startVisit(UniformVisitor.Adapters.asVisitor(v));
        return v.enumeration;
    }
}