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

Go to download
Show more of this group Show more artifacts with this name
Show all versions of cssvalidator Show documentation
Backend for the W3C CSS Validation Service
There is a newer version: 1.0.8
//
// Author: Yves Lafon 
//
// (c) COPYRIGHT MIT, ERCIM, Keio, Beihang, 2017.
// 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 https://www.w3.org/TR/2015/CR-compositing-1-20150113/#propdef-background-blend-mode
 */
public class CssBackgroundBlendMode extends org.w3c.css.properties.css.CssBackgroundBlendMode {

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

    /**
     * Creates a new CssBackgroundBlendMode
     *
     * @param expression The expression for this property
     * @throws org.w3c.css.util.InvalidParamException
     *          Expressions are incorrect
     */
    public CssBackgroundBlendMode(ApplContext ac, CssExpression expression, boolean check)
            throws InvalidParamException {
        setByUser();

        CssValue val;
        CssIdent ident, id;
        char op;

        ArrayList values = new ArrayList<>();

        while (!expression.end()) {
            val = expression.getValue();
            op = expression.getOperator();

            if (val.getType() == CssTypes.CSS_IDENT) {
                ident = (CssIdent) val;
                if (inherit.equals(ident)) {
                    if (expression.getCount() > 1) {
                        throw new InvalidParamException("value",
                                val.toString(),
                                getPropertyName(), ac);
                    }
                    values.add(inherit);
                } else {
                    id = CssMixBlendMode.getAllowedIdent(ident);
                    if (id == null) {
                        throw new InvalidParamException("value",
                                val.toString(),
                                getPropertyName(), ac);
                    }
                    values.add(id);
                }
            } else {
                throw new InvalidParamException("value",
                        val.toString(),
                        getPropertyName(), ac);
            }
            expression.next();
            if (op != COMMA && !expression.end()) {
                throw new InvalidParamException("operator", op,
                        getPropertyName(), ac);
            }
        }
        value = (values.size() == 1) ? values.get(0) : new CssLayerList(values);
    }

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

}