w3c.css.properties.css3.CssBackgroundImage Maven / Gradle / Ivy

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Backend for the W3C CSS Validation Service
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// $Id$
// @author Yves Lafon 
//
// (c) COPYRIGHT MIT, ERCIM and Keio, 2010.
// Please first read the full copyright statement in file COPYRIGHT.html

package org.w3c.css.properties.css3;

import org.w3c.css.util.ApplContext;
import org.w3c.css.util.InvalidParamException;
import org.w3c.css.values.CssExpression;
import org.w3c.css.values.CssIdent;
import org.w3c.css.values.CssLayerList;
import org.w3c.css.values.CssTypes;
import org.w3c.css.values.CssValue;

import java.util.ArrayList;

import static org.w3c.css.values.CssOperator.COMMA;

/**
 * @spec http://www.w3.org/TR/2009/CR-css3-background-20091217/#the-background-image
 */
public class CssBackgroundImage extends org.w3c.css.properties.css.CssBackgroundImage {


    public static boolean isMatchingIdent(CssIdent ident) {
        return none.equals(ident);
    }

    /**
     * Create a new CssBackgroundImage
     */
    public CssBackgroundImage() {
        value = initial;
    }

    /**
     * Creates a new CssBackgroundImage
     *
     * @param ac         the context
     * @param expression The expression for this property
     * @param check      boolean
     * @throws org.w3c.css.util.InvalidParamException
     *          Values are incorrect
     */
    public CssBackgroundImage(ApplContext ac, CssExpression expression,
                              boolean check) throws InvalidParamException {

        ArrayList values = new ArrayList();
        setByUser();

        CssValue val;
        char op;

        while (!expression.end()) {
            val = expression.getValue();
            op = expression.getOperator();
            switch (val.getType()) {
                case CssTypes.CSS_URL:
                case CssTypes.CSS_IMAGE:
                    values.add(val);
                    break;
                case CssTypes.CSS_IDENT:
                    if (inherit.equals(val)) {
                        // if we got inherit after other values, fail
                        // if we got more than one value... fail
                        if ((values.size() > 0) || (expression.getCount() > 1)) {
                            throw new InvalidParamException("value", val,
                                    getPropertyName(), ac);
                        }
                        values.add(inherit);
                        break;
                    } else if (none.equals(val)) {
                        values.add(none);
                        break;
                    }
                default:
                    throw new InvalidParamException("value", val,
                            getPropertyName(), ac);
            }
            expression.next();
            if (!expression.end() && (op != COMMA)) {
                throw new InvalidParamException("operator",
                        ((new Character(op)).toString()), ac);
            }
        }
        if (values.size() == 1) {
            value = values.get(0);
        } else {
            value = new CssLayerList(values);
        }
    }

    public CssBackgroundImage(ApplContext ac, CssExpression expression)
            throws InvalidParamException {
        this(ac, expression, false);
    }

    /**
     * Is the value of this property is a default value.
     * It is used by all macro for the function print
     */
    public boolean isDefault() {
        return (value == none);
    }

}