w3c.css.properties.css3.CssColumns 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
//
// From Sijtsche de Jong ([email protected])
// Rewritten 2010 Yves Lafon 
//
// COPYRIGHT (c) 1995-2018 World Wide Web Consortium, (MIT, ERCIM and Keio)
// Please first read the full copyright statement in file COPYRIGHT.html

package org.w3c.css.properties.css3;

import org.w3c.css.parser.CssStyle;
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;
import org.w3c.css.values.CssValueList;

import java.util.ArrayList;

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

/**
 * @spec https://www.w3.org/TR/2018/WD-css-multicol-1-20180528/#propdef-columns
 * @see org.w3c.css.properties.css3.CssColumnWidth
 * @see org.w3c.css.properties.css3.CssColumnCount
 */

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

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

    CssColumnWidth width = null;
    CssColumnCount count = null;

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

    /**
     * Create a new CssColumns
     *
     * @param ac         the context
     * @param expression The expression for this property
     * @param check      if checking is enforced
     * @throws org.w3c.css.util.InvalidParamException
     *          Incorrect values
     */
    public CssColumns(ApplContext ac, CssExpression expression,
                      boolean check) throws InvalidParamException {

        CssValue val;
        ArrayList values = new ArrayList<>();
        char op;
        int nb_val = expression.getCount();
        int nb_auto = 0;

        if (check && nb_val > 2) {
            throw new InvalidParamException("unrecognize", ac);
        }
        setByUser();

        while (!expression.end()) {
            val = expression.getValue();
            op = expression.getOperator();
            if (op != SPACE) {
                throw new InvalidParamException("operator",
                        ((new Character(op)).toString()),
                        ac);
            }
            switch (val.getType()) {
                case CssTypes.CSS_NUMBER:
                    if (count != null) {
                        throw new InvalidParamException("unrecognize", ac);
                    }
                    count = new CssColumnCount(ac, expression);
                    values.add(val);
                    break;
                case CssTypes.CSS_FUNCTION:
                case CssTypes.CSS_LENGTH:
                    if (width != null) {
                        throw new InvalidParamException("unrecognize", ac);
                    }
                    width = new CssColumnWidth(ac, expression);
                    values.add(val);
                    break;
                case CssTypes.CSS_IDENT:
                    if (inherit.equals((CssIdent) val)) {
                        if (nb_val > 1) {
                            throw new InvalidParamException("unrecognize", ac);
                        }
                        value = inherit;
                        expression.next();
                        break;
                    }
                    if (auto.equals((CssIdent) val)) {
                        nb_auto++;
                        values.add(auto);
                        expression.next();
                        break;
                    }
                    // otherwise it should be a width.
                    if (width != null) {
                        throw new InvalidParamException("unrecognize", ac);
                    }
                    width = new CssColumnWidth(ac, expression);
                    values.add(val);
                    break;
                default:
                    throw new InvalidParamException("value",
                            expression.getValue(),
                            getPropertyName(), ac);
            }
        }
        if (nb_val == 1) {
            if (value != inherit) {
                value = values.get(0);
            }
        } else {
            value = new CssValueList(values);
            // fill the other values.
            if (nb_auto == 2) {
                count = new CssColumnCount();
                count.value = auto;
                width = new CssColumnWidth();
                width.value = auto;
            } else if (nb_auto == 1) {
                if (count != null) {
                    width = new CssColumnWidth();
                    width.value = auto;
                } else {
                    count = new CssColumnCount();
                    count.value = auto;
                }
            }
        }
    }

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

    /**
     * Add this property to the CssStyle
     *
     * @param style The CssStyle
     */
    public void addToStyle(ApplContext ac, CssStyle style) {
        super.addToStyle(ac, style);
        if (count != null) {
            count.addToStyle(ac, style);
        }
        if (width != null) {
            width.addToStyle(ac, style);
        }
    }

    /**
     * Is the value of this property a default value
     * It is used by all macro for the function print
     */

    public boolean isDefault() {
        return (value == initial);
    }

}