w3c.css.properties.css3.CssBreakBefore 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
// $Id$
// From Sijtsche de Jong ([email protected])
// Rewritten 2010 Yves Lafon 

// (c) COPYRIGHT 1995-2010  World Wide Web Consortium (MIT, ERCIM and Keio)
// Please first read the full copyright statement at
// http://www.w3.org/Consortium/Legal/copyright-software-19980720

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.CssTypes;
import org.w3c.css.values.CssValue;

/**
 * @spec https://www.w3.org/TR/2017/CR-css-break-3-20170209/#propdef-break-before
 */

public class CssBreakBefore extends org.w3c.css.properties.css.CssBreakBefore {

    static CssIdent auto;
    private static CssIdent[] allowed_values;

    static {
        auto = CssIdent.getIdent("auto");
        String id_values[] = {"auto", "avoid", "avoid-page", "page",
                "left", "right", "recto", "verso", "avoid-column",
                "column", "avoid-region", "region"};
        allowed_values = new CssIdent[id_values.length];
        int i = 0;
        for (String s : id_values) {
            allowed_values[i++] = CssIdent.getIdent(s);
        }
    }

    public static CssIdent getMatchingIdent(CssIdent ident) {
        for (CssIdent id : allowed_values) {
            if (id.equals(ident)) {
                return id;
            }
        }
        return null;
    }

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

    /**
     * Create a new CssBreakBefore
     *
     * @param ac         the context
     * @param expression The expression for this property
     * @param check      if checking is needed
     * @throws org.w3c.css.util.InvalidParamException
     *          Incorrect value
     */
    public CssBreakBefore(ApplContext ac, CssExpression expression,
                          boolean check) throws InvalidParamException {
        setByUser();
        CssValue val = expression.getValue();

        if (check && expression.getCount() > 1) {
            throw new InvalidParamException("unrecognize", ac);
        }

        if (val.getType() != CssTypes.CSS_IDENT) {
            throw new InvalidParamException("value",
                    expression.getValue(),
                    getPropertyName(), ac);
        }
        // ident, so inherit, or allowed value
        if (inherit.equals(val)) {
            value = inherit;
        } else {
            val = getMatchingIdent((CssIdent) val);
            if (val == null) {
                throw new InvalidParamException("value",
                        expression.getValue(),
                        getPropertyName(), ac);
            }
            value = val;
        }
        expression.next();
    }

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

    /**
     * Is the value of this property a default value
     * It is used by all macro for the function print
     */
    public boolean isDefault() {
        return (auto == value);
    }

}