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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, 2012.
// Please first read the full copyright statement in file COPYRIGHT.html
package org.w3c.css.values;

import org.w3c.css.util.ApplContext;
import org.w3c.css.util.InvalidParamException;

/**
 * @spec http://www.w3.org/TR/2008/REC-CSS1-20080411/#units
 */
public class CssUnitsCSS1 {
    private static final String[] relative_length_units = {
            "em", "ex", "px"
    };

    private static final String[] absolute_length_units = {
            "in", "cm", "mm", "pt", "pc"
    };

    protected static String getRelativeLengthUnit(String unit) {
        for (String s : relative_length_units) {
            if (s.equals(unit)) {
                return s;
            }
        }
        return null;
    }

    protected static String getAbsoluteLengthUnit(String unit) {
        for (String s : absolute_length_units) {
            if (s.equals(unit)) {
                return s;
            }
        }
        return null;
    }

    protected static void parseLengthUnit(String unit, CssLength length, ApplContext ac)
            throws InvalidParamException {
        String matchedUnit = getRelativeLengthUnit(unit);
        if (matchedUnit != null) {
            length.absolute = false;
        } else {
            matchedUnit = getAbsoluteLengthUnit(unit);
            if (matchedUnit == null) {
                throw new InvalidParamException("unit", unit, ac);
            }
            length.absolute = true;
        }
        length.unit = matchedUnit;
    }
}