/*
 * (c) Copyright 2009 Hewlett-Packard Development Company, LP
 * All rights reserved.
 * [See end of file]
 */

package org.openjena.riot;

public class RiotChars
{
    // ---- Character classes 
    
    public static boolean isAlpha(int codepoint)
    {
        return Character.isLetter(codepoint) ;
    }
    
    public static boolean isAlphaNumeric(int codepoint)
    {
        return Character.isLetterOrDigit(codepoint) ;
    }
    
    /** ASCII A-Z */
    public static boolean isA2Z(int ch)
    {
        return range(ch, 'a', 'z') || range(ch, 'A', 'Z') ;
    }

    /** ASCII A-Z or 0-9 */
    public static boolean isA2ZN(int ch)
    {
        return range(ch, 'a', 'z') || range(ch, 'A', 'Z') || range(ch, '0', '9') ;
    }

    /** ASCII 0-9 */
    public static boolean isDigit(int ch)
    {
        return range(ch, '0', '9') ;
    }
    
    public static boolean isWhitespace(int ch)
    {
        // ch = ch | 0xFF ;
        return ch == ' ' || ch == '\t' || ch == '\r' || ch == '\n' || ch == '\f' ;    
    }
    
    public static boolean isNewlineChar(int ch)
    {
        return ch == '\r' || ch == '\n' ;
    }

    public static int valHexChar(int ch)
    {
        if ( range(ch, '0', '9') )
            return ch-'0' ;
        if ( range(ch, 'a', 'f') )
            return ch-'a'+10 ;
        if ( range(ch, 'A', 'F') )
            return ch-'A'+10 ;
        return -1 ;
    }

    
    public static boolean range(int ch, char a, char b)
    {
        return ( ch >= a && ch <= b ) ;
    }



}

/*
 * (c) Copyright 2009 Hewlett-Packard Development Company, LP
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */