w3c.css.properties.css3.CssCueBefore 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 University, 2013.
// 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.CssTypes;
import org.w3c.css.values.CssValue;
import org.w3c.css.values.CssValueList;

import java.util.ArrayList;

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

/**
 * @spec http://www.w3.org/TR/2012/CR-css3-speech-20120320/#cue-before
 */
public class CssCueBefore extends org.w3c.css.properties.css.CssCueBefore {

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

    /**
     * Creates a new CssCueBefore
     *
     * @param expression The expression for this property
     * @throws org.w3c.css.util.InvalidParamException
     *          Expressions are incorrect
     */
    public CssCueBefore(ApplContext ac, CssExpression expression, boolean check)
            throws InvalidParamException {
        if (check && expression.getCount() > 2) {
            throw new InvalidParamException("unrecognize", ac);
        }
        setByUser();

        CssValue val;
        char op;

        val = expression.getValue();
        op = expression.getOperator();

        switch (val.getType()) {
            case CssTypes.CSS_URL:
                value = val;
                // now let's check for a volume...
                if (expression.getRemainingCount() > 1) {
                    CssValue vnext = expression.getNextValue();
                    if (vnext.getType() == CssTypes.CSS_VOLUME) {
                        // we got a volume, so let's do extra checks, then
                        // construct the value...
                        if (op != SPACE) {
                            throw new InvalidParamException("operator",
                                    ((new Character(op)).toString()), ac);
                        }
                        expression.next();
                        ArrayList values = new ArrayList(2);
                        values.add(val);
                        values.add(vnext);
                        value = new CssValueList(values);
                    } else if (check) {
                        throw new InvalidParamException("value",
                                vnext, getPropertyName(), ac);
                    }
                }
                break;
            case CssTypes.CSS_IDENT:
                if (inherit.equals(val)) {
                    if (expression.getCount() > 1) {
                        throw new InvalidParamException("value",
                                inherit, getPropertyName(), ac);
                    }
                    value = inherit;
                    break;
                }
                if (none.equals(val)) {
                    if (check && expression.getCount() > 1) {
                        throw new InvalidParamException("value",
                                inherit, getPropertyName(), ac);
                    }
                    value = none;
                    break;
                }
            default:
                throw new InvalidParamException("value",
                        val.toString(),
                        getPropertyName(), ac);
        }
        expression.next();
    }

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