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

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// $Id$
// 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/2018/CR-css-break-3-20181204/#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);
    }

}