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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 2008 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.base.Preconditions;
import com.google.common.css.compiler.ast.*;

/**
 *
 */
public class HasConditionalNodes extends DefaultTreeVisitor
        implements CssCompilerPass {

    private final VisitController visitController;

    private boolean hasConditionalNodes = false;

    private boolean passWasRun = false;

    HasConditionalNodes(VisitController visitController) {
        this.visitController = visitController;
    }

    @Override
    public boolean enterConditionalBlock(CssConditionalBlockNode block) {
        // assert !block.isEmpty();
        hasConditionalNodes = true;
        visitController.stopVisit();
        return true;
    }

    @Override
    public boolean enterConditionalRule(CssConditionalRuleNode node) {
        // This should never get called as the visit should stop at the enclosing
        // conditional block of the first conditional rule.
        // assert false;
        return false;
    }

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

    public boolean hasConditionalNodes() {
        Preconditions.checkState(passWasRun);
        return hasConditionalNodes;
    }
}