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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 2009 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.css.compiler.ast.*;

/**
 * Compiler pass that traverses the tree and marks as default the value nodes
 * in a definition that has the corresponding annotation.
 *
 * @author [email protected] (Oana Florescu)
 */
public class MarkDefaultDefinitions extends DefaultTreeVisitor
        implements CssCompilerPass {

    private final VisitController visitController;

    /**
     * String that matches the comment marking a definition as a default value.
     */
    private static final String DEFAULT = "/* @default */";

    public MarkDefaultDefinitions(VisitController visitController) {
        this.visitController = visitController;
    }

    @Override
    public boolean enterDefinition(CssDefinitionNode definition) {
        boolean isDefault = definition.hasComment(DEFAULT);
        for (CssValueNode param : definition.getParameters()) {
            if (param.hasComment(DEFAULT)) {
                isDefault = true;
                break;
            }
        }
        if (isDefault) {
            for (CssValueNode node : definition.getParameters()) {
                node.setIsDefault(true);
            }
        }
        return false;
    }

    @Override
    public void runPass() {
        visitController.startVisit(this);
    }
}