w3c.css.properties.css2.CssClip 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
// $Id$
// Author: Yves Lafon 
//
// (c) COPYRIGHT MIT, ERCIM and Keio University, 2012.
// Please first read the full copyright statement in file COPYRIGHT.html
package org.w3c.css.properties.css2;

import org.w3c.css.properties.css.CssProperty;
import org.w3c.css.util.ApplContext;
import org.w3c.css.util.InvalidParamException;
import org.w3c.css.values.CssExpression;
import org.w3c.css.values.CssFunction;
import org.w3c.css.values.CssIdent;
import org.w3c.css.values.CssTypes;
import org.w3c.css.values.CssValue;

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

/**
 * @spec http://www.w3.org/TR/2008/REC-CSS2-20080411/visufx.html#clipping
 */
public class CssClip extends org.w3c.css.properties.css.CssClip {

    public static final CssIdent auto = CssIdent.getIdent("auto");

    /**
     * Create a new CssClip
     */
    public CssClip() {
    }

    /**
     * Creates a new CssClip
     *
     * @param expression The expression for this property
     * @throws org.w3c.css.util.InvalidParamException
     *          Expressions are incorrect
     */
    public CssClip(ApplContext ac, CssExpression expression, boolean check)
            throws InvalidParamException {
        if (check && expression.getCount() > 1) {
            throw new InvalidParamException("unrecognize", ac);
        }
        setByUser();

        CssValue val = expression.getValue();

        switch (val.getType()) {
            case CssTypes.CSS_FUNCTION:
                CssFunction func = (CssFunction) val;
                String funcname = func.getName().toLowerCase();
                if (!funcname.equals("rect")) {
                    throw new InvalidParamException("shape", val,
                            getPropertyName(), ac);
                }
                checkShape(ac, func.getParameters(), this);
                value = val;
                break;
            case CssTypes.CSS_IDENT:
                if (inherit.equals(val)) {
                    value = inherit;
                    break;
                } else if (auto.equals(val)) {
                    value = auto;
                    break;
                }
                // let if fail.
            default:
                throw new InvalidParamException("value", val,
                        getPropertyName(), ac);
        }
        expression.next();
    }

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

    static void checkShape(ApplContext ac, CssExpression expression,
                           CssProperty caller) throws InvalidParamException {
        if (expression.getCount() < 4) {
            throw new InvalidParamException("few-value", caller.getPropertyName(), ac);
        }
        if (expression.getCount() > 4) {
            throw new InvalidParamException("unrecognize", ac);
        }
        CssValue val;
        char op, firstop;
        firstop = expression.getOperator();
        if (firstop == SPACE) {
            // we add a warning for SPACE
            ac.getFrame().addWarning("shape-separator");
        }
        for (int i = 0; i < 4; i++) {
            val = expression.getValue();
            op = expression.getOperator();
            switch (val.getType()) {
                case CssTypes.CSS_NUMBER:
                    val.getLength();
                case CssTypes.CSS_LENGTH:
                    break;
                case CssTypes.CSS_IDENT:
                    if (auto.equals(val)) {
                        break;
                    }
                default:
                    throw new InvalidParamException("value",
                            val.toString(),
                            caller.getPropertyName(), ac);
            }
            expression.next();
            // as the spec was unclear, we allow comma or space
            // but no mix of the two
            // special case at the end as default separator is SPACE
            if (((op != firstop) || (op != COMMA && op != SPACE)) && !expression.end()) {
                throw new InvalidParamException("shape-separator",
                        ((new Character(op)).toString()), ac);
            }
        }
    }
}