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server-sass is a simple implementation of SASS (sass-lang.org)

There is a newer version: 5.0.1

/*
 * Made with all the love in the world
 * by scireum in Remshalden, Germany
 *
 * Copyright by scireum GmbH
 * http://www.scireum.de - [email protected]
 */

package org.serversass.ast;

import org.serversass.Generator;
import org.serversass.Scope;

/**
 * Base class for all AST classes
 *
 * @author Andreas Haufler ([email protected])
 * @since 2014/02
 */
public abstract class Expression {

    /**
     * Determines if this expression is constant or if it depends on variables.
     *
     * @return true if the expression is constant, false otherwise
     */
    public abstract boolean isConstant();

    /**
     * If possible the expression is evaluated and a simplified expression is returned.
     *
     * @param scope the scope used to resolve variables.
     * @param gen   the generator used to evaluate functions
     * @return a possibly simplified version of the expression
     */
    public abstract Expression eval(Scope scope, Generator gen);

}