com.google.common.css.compiler.ast.CssValueNode Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of closure-stylesheets Show documentation

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.

There is a newer version: 1.8.0

Show newest version

/*
 * 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.ast;

import com.google.common.base.Preconditions;
import com.google.common.css.SourceCodeLocation;

import javax.annotation.Nullable;

/**
 * A CSS node that holds a value of some sort. This is the base class for all
 * the nodes in the abstract syntax tree that have a value.
 * 
 * TODO(oana): Maybe de-emphasize the value aspect, allow value to be null, and
 * rename this as CssTermNode.
 */
public abstract class CssValueNode extends CssNode {

    /**
     * The value contained by the node.
     */
    private String value;

    /**
     * Annotation to show whether this is a default value or not.
     */
    private boolean isDefault;

    /**
     * Constructor of a node that contains a value.
     *
     * @param value              value
     * @param sourceCodeLocation sourceCodeLocation
     */
    protected CssValueNode(@Nullable String value,
                           @Nullable SourceCodeLocation sourceCodeLocation) {
        super(sourceCodeLocation);
        this.value = value;
        this.isDefault = false;
    }

    /**
     * Constructor of a node that contains a value.
     *
     * @param value value
     */
    protected CssValueNode(String value) {
        this(value, null);
    }

    /**
     * Copy constructor.
     *
     * @param node node
     */
    protected CssValueNode(CssValueNode node) {
        this(node.getValue(), node.getSourceCodeLocation());
        this.isDefault = node.getIsDefault();
    }

    @Override
    public abstract CssValueNode deepCopy();

    public String getValue() {
        return this.value;
    }

    /**
     * Subclasses should perform additional consistency checks. For example, a
     * boolean expression node will not allow setting this as boolean expression
     * trees are immutable.
     */
    public void setValue(String value) {
        Preconditions.checkNotNull(value);
        this.value = value;
    }

    public void setIsDefault(boolean isDefault) {
        this.isDefault = isDefault;
    }

    public boolean getIsDefault() {
        return isDefault;
    }

    /**
     * Use for debugging only.
     */
    @Override
    public String toString() {
        return getValue();
    }
}