w3c.css.properties.svg.CssMaskImage Maven / Gradle / Ivy

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Backend for the W3C CSS Validation Service
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//
// Author: Yves Lafon 
//
// (c) COPYRIGHT MIT, ERCIM, Keio, Beihang, 2018.
// Please first read the full copyright statement in file COPYRIGHT.html
package org.w3c.css.properties.svg;

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/2014/CR-css-masking-1-20140826/#the-mask-image
 */
public class CssMaskImage extends org.w3c.css.properties.css.CssMaskImage {

    public static CssIdent getAllowedIdent(CssIdent ident) {
        if (none.equals(ident)) {
            return none;
        }
        return null;
    }


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

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

        setByUser();

        ArrayList v = new ArrayList<>();
        CssValue val;
        char op;

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

            switch (val.getType()) {
                case CssTypes.CSS_URL:
                case CssTypes.CSS_IMAGE:
                    v.add(val);
                    break;
                case CssTypes.CSS_IDENT:
                    if (inherit.equals(val)) {
                        if (expression.getCount() > 1) {
                            throw new InvalidParamException("unrecognize", ac);
                        }
                        value = inherit;
                        break;
                    }
                    CssIdent id = getAllowedIdent((CssIdent) val);
                    if (id != null) {
                        v.add(id);
                        break;
                    }
                default:
                    throw new InvalidParamException("value",
                            val.toString(),
                            getPropertyName(), ac);
            }
            expression.next();
            if (op != COMMA && !expression.end()) {
                throw new InvalidParamException("operator",
                        Character.toString(op),
                        ac);
            }
        }
        if (!v.isEmpty()) {
            value = (v.size() == 1) ? v.get(0) : new CssLayerList(v);
        }
    }

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

}