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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 2014 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.base.Preconditions;
import com.google.common.collect.ImmutableList;

import java.util.List;

/**
 * A CSS node that holds a mathematical expression.
 *
 * See http://www.w3.org/TR/css3-values/#calc
 */
public final class CssMathNode extends CssCompositeValueNode {

    private CssMathNode(
            CssValueNode operand1,
            CssCompositeValueNode.Operator operator,
            CssValueNode operand2,
            boolean hasParenthesis) {
        super(ImmutableList.of(operand1, operand2), operator, hasParenthesis, null);
    }

    public static CssValueNode createFromOperandsAndOperators(
            List operands,
            List operators,
            boolean hasParenthesis) {
        Preconditions.checkArgument(
                operands.size() == operators.size() + 1,
                "There should be one more operands than operators");
        if (operators.isEmpty()) {
            return operands.get(0);
        }
        if (operators.size() == 1) {
            return new CssMathNode(operands.get(0), operators.get(0), operands.get(1), hasParenthesis);
        } else {
            return new CssMathNode(
                    operands.get(0),
                    operators.get(0),
                    createFromOperandsAndOperators(
                            operands.subList(1, operands.size()), operators.subList(1, operators.size()), false),
                    hasParenthesis);
        }
    }

    @Override
    public CssMathNode deepCopy() {
        CssValueNode operand1 = getValues().get(0);
        CssValueNode operand2 = getValues().get(1);
        return new CssMathNode(operand1, getOperator(), operand2, hasParenthesis());
    }
}