/*-- 

 Copyright (C) 2000-2012 Jason Hunter & Brett McLaughlin.
 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 disclaimer that follows 
    these conditions in the documentation and/or other materials 
    provided with the distribution.

 3. The name "JDOM" must not be used to endorse or promote products
    derived from this software without prior written permission.  For
    written permission, please contact <request_AT_jdom_DOT_org>.

 4. Products derived from this software may not be called "JDOM", nor
    may "JDOM" appear in their name, without prior written permission
    from the JDOM Project Management <request_AT_jdom_DOT_org>.

 In addition, we request (but do not require) that you include in the 
 end-user documentation provided with the redistribution and/or in the 
 software itself an acknowledgement equivalent to the following:
     "This product includes software developed by the
      JDOM Project (http://www.jdom.org/)."
 Alternatively, the acknowledgment may be graphical using the logos 
 available at http://www.jdom.org/images/logos.

 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 JDOM AUTHORS OR THE PROJECT
 CONTRIBUTORS 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.

 This software consists of voluntary contributions made by many 
 individuals on behalf of the JDOM Project and was originally 
 created by Jason Hunter <jhunter_AT_jdom_DOT_org> and
 Brett McLaughlin <brett_AT_jdom_DOT_org>.  For more information
 on the JDOM Project, please see <http://www.jdom.org/>.

 */

package org.jdom2.contrib.verifier;

import org.jdom2.Verifier;

/**
 * A utility class to build the data component of the main
 * org.jdom2.Verifier class. This class contains all the character
 * identification/classification routines.
 * <p>
 * This class is based on the content of the main Verifier.java class
 * prior to this optimization.
 *
 * @author  Brett McLaughlin
 * @author  Elliotte Rusty Harold
 * @author  Jason Hunter
 * @author  Bradley S. Huffman
 * @author  Rolf Lear
 */
final public class VerifierBuilder {

	/**
	 * Ensure instantiation cannot occur.
	 */
	private VerifierBuilder() { }
	
	
	private static final int charcnt = Character.MAX_VALUE + 1;
	private static final byte maskxmlcharacter      = 1 << 0;
	private static final byte maskxmlletter         = 1 << 1;
	private static final byte maskxmlstart          = 1 << 2;
	private static final byte maskxmlnamecharacter  = 1 << 3;
	private static final byte maskxmldigit          = 1 << 4;
	private static final byte maskxmlcombining      = 1 << 5;
	private static final byte maskuricharacter      = 1 << 6;
	
	@SuppressWarnings("javadoc")
	public static void main(String[] args) {
		// populate the flags array.
		final byte[] flags = new byte[charcnt];
		
		for (int i = 0; i < charcnt; i++) {
			if (isXMLCharacter(i)) {
				flags[i] |= maskxmlcharacter;
			}
			
			final char c = (char)i;
			
			if (isXMLLetter(c)) {
				flags[i] |= maskxmlletter;
			}
			if (isXMLNameCharacter(c)) {
				flags[i] |= maskxmlnamecharacter;
			}
			if (isXMLNameStartCharacter(c)) {
				flags[i] |= maskxmlstart;
			}
			if (isXMLDigit(c)) {
				flags[i] |= maskxmldigit;
			}
			if (isXMLCombiningChar(c)) {
				flags[i] |= maskxmlcombining;
			}
			if (isURICharacter(c)) {
				flags[i] |= maskuricharacter;
			}
			
			if (flags[i] != 0) {
				if ((flags[i] & maskxmlcharacter) == 0) {
					// for performance reasons, the testing of CharacterData
					// in the final Verifier code does not use the bit-mask for it,
					// but rather just checks for a non-zero flag. It does not need to
					// check the actual bit because there are no characters flagged for
					// any other role (name chars, uri's, etc.) that are not also a pure
					// subset of the Character Data set.
					throw new IllegalStateException("Flagged non-xmlchar '" + (char)i + "'.");
				}
			}
		}
		
		// OK, now 'condense' the flags array to something usable.
		byte[] vals = new byte[flags.length];
		int[] lens = new int[flags.length];
		int index = 0;
		byte val = flags[0];
		int cnt = 0;
		
		for (int i = 0; i < flags.length; i++) {
			if (flags[i] == val) {
				cnt++;
			} else {
				vals[index] = val;
				lens[index] = cnt;
				val = flags[i];
				cnt = 1;
				index++;
			}
		}
		vals[index] = val;
		lens[index] = cnt;
		index++;
		
		int ci = 0;
		for (int i = 0; i < index; i++) {
			int l = lens[i];
			final byte v = vals[i];
			while (--l >= 0) {
				if (flags[ci] != v) {
					throw new IllegalStateException(String.format(
							"Failed to calculate byte 0x%02x at index %d. Calculated 0x%02x instead.",
							flags[ci], ci, v));
				}
				ci++;
			}
		}
		
		System.out.println("There are " + index + " transitions.");
		
		StringBuilder sbval = new StringBuilder();
		StringBuilder sblen = new StringBuilder();
		
		sbval.append("private static final byte[] VALCONST = new byte[] {");
		sblen.append("private static final int [] LENCONST = new int [] {");
		
		for (int i = 0; i < index; i++) {
			if (i > 0) {
				sbval.append(", ");
				sblen.append(", ");
			}
			if ((i % 8) == 0) {
				sbval.append("\n        ");
				sblen.append("\n        ");
			}
			if ((vals[i] & (byte)0x80) != 0) {
				sbval.append("(byte)");
			}
			sbval.append(String.format("0x%02x", vals[i]));
			sblen.append(String.format("%5d", lens[i]));
		}
		
		sbval.append("};\n");
		sblen.append("};\n");
		
		System.out.println(sbval.toString());
		System.out.println(sblen.toString());
		
	}
	

	/**
	 * <p>
	 * This is a utility function for determining whether a specified
	 * Unicode character is a hexadecimal digit as defined in RFC 2396;
	 * that is, one of the ASCII characters 0-9, a-f, or A-F.
	 * </p>
	 *
	 * @param c  to check for hex digit.
	 * @return true if it's allowed, false otherwise.
	 */
	public static boolean isHexDigit(final char c) {

		// I suspect most characters passed to this method will be
		// correct hexadecimal digits, so I test for the true cases
		// first. If this proves to be a performance bottleneck
		// a switch statement or lookup table
		// might optimize this.
		if (c >= '0' && c <= '9') return true;
		if (c >= 'A' && c <= 'F') return true;
		if (c >= 'a' && c <= 'f') return true;

		return false;
	}

	/**
	 * <p>
	 * This is a utility function for determining whether
	 * a specified Unicode character is legal in URI references
	 * as determined by RFC 2396.
	 * </p>
	 *
	 * @param c <code>char</code> to check for URI reference compliance.
	 * @return true if it's allowed, false otherwise.
	 */
	public static boolean isURICharacter(final char c) {
		if (c >= 'a' && c <= 'z') return true;
		if (c >= 'A' && c <= 'Z') return true;
		if (c >= '0' && c <= '9') return true;
		if (c == '/') return true;
		if (c == '-') return true;
		if (c == '.') return true;
		if (c == '?') return true;
		if (c == ':') return true;
		if (c == '@') return true;
		if (c == '&') return true;
		if (c == '=') return true;
		if (c == '+') return true;
		if (c == '$') return true;
		if (c == ',') return true;
		if (c == '%') return true;

		if (c == '_') return true;
		if (c == '!') return true;
		if (c == '~') return true;
		if (c == '*') return true;
		if (c == '\'') return true;
		if (c == '(') return true;
		if (c == ')') return true;
		return false;
	}

	/**
	 * This is a utility function for determining whether a specified 
	 * character is a character according to production 2 of the 
	 * XML 1.0 specification.
	 *
	 * @param c <code>char</code> to check for XML compliance
	 * @return <code>boolean</code> true if it's a character, 
	 *                                false otherwise
	 */
	public static boolean isXMLCharacter(final int c) {

		if (c == '\n') return true;
		if (c == '\r') return true;
		if (c == '\t') return true;

		if (c < 0x20) return false;  if (c <= 0xD7FF) return true;
		if (c < 0xE000) return false;  if (c <= 0xFFFD) return true;
		if (c < 0x10000) return false;  if (c <= 0x10FFFF) return true;

		return false;
	}


	/**
	 * This is a utility function for determining whether a specified 
	 * character is a name character according to production 4 of the 
	 * XML 1.0 specification.
	 *
	 * @param c <code>char</code> to check for XML name compliance.
	 * @return <code>boolean</code> true if it's a name character, 
	 *                                false otherwise.
	 */
	public static boolean isXMLNameCharacter(final char c) {

		// remove check for || c == ':'
		// JDOM Attributes and Elements cannot start with ':' since JDOM
		// separates the prefix from the name.
		// we do not want ':' in the bitmask, instead we add it later.
		
		return (isXMLLetter(c) || isXMLDigit(c) || c == '.' || c == '-' 
				|| c == '_'  || isXMLCombiningChar(c) 
				|| Verifier.isXMLExtender(c));
	}

	/**
	 * This is a utility function for determining whether a specified 
	 * character is a legal name start character according to production 5
	 * of the XML 1.0 specification. This production does allow names
	 * to begin with colons which the Namespaces in XML Recommendation
	 * disallows. 
	 *
	 * @param c <code>char</code> to check for XML name start compliance.
	 * @return <code>boolean</code> true if it's a name start character, 
	 *                                false otherwise.
	 */
	public static boolean isXMLNameStartCharacter(final char c) {

		// remove check for || c == ':'
		// JDOM Attributes and Elements cannot start with ':' since JDOM
		// separates the prefix from the name.
		// we do not want ':' in the bitmask, instead we add it later.
		
		return (isXMLLetter(c) || c == '_');

	}

	/**
	 * This is a utility function for determining whether a specified character
	 * is a letter according to production 84 of the XML 1.0 specification.
	 *
	 * @param c <code>char</code> to check for XML name compliance.
	 * @return <code>String</code> true if it's a letter, false otherwise.
	 */
	public static boolean isXMLLetter(final char c) {
		// Note that order is very important here.  The search proceeds 
		// from lowest to highest values, so that no searching occurs 
		// above the character's value.  BTW, the first line is equivalent to:
		// if (c >= 0x0041 && c <= 0x005A) return true;

		if (c < 0x0041) return false;  if (c <= 0x005a) return true;
		if (c < 0x0061) return false;  if (c <= 0x007A) return true;
		if (c < 0x00C0) return false;  if (c <= 0x00D6) return true;
		if (c < 0x00D8) return false;  if (c <= 0x00F6) return true;
		if (c < 0x00F8) return false;  if (c <= 0x00FF) return true;
		if (c < 0x0100) return false;  if (c <= 0x0131) return true;
		if (c < 0x0134) return false;  if (c <= 0x013E) return true;
		if (c < 0x0141) return false;  if (c <= 0x0148) return true;
		if (c < 0x014A) return false;  if (c <= 0x017E) return true;
		if (c < 0x0180) return false;  if (c <= 0x01C3) return true;
		if (c < 0x01CD) return false;  if (c <= 0x01F0) return true;
		if (c < 0x01F4) return false;  if (c <= 0x01F5) return true;
		if (c < 0x01FA) return false;  if (c <= 0x0217) return true;
		if (c < 0x0250) return false;  if (c <= 0x02A8) return true;
		if (c < 0x02BB) return false;  if (c <= 0x02C1) return true;
		if (c == 0x0386) return true;
		if (c < 0x0388) return false;  if (c <= 0x038A) return true;
		if (c == 0x038C) return true;
		if (c < 0x038E) return false;  if (c <= 0x03A1) return true;
		if (c < 0x03A3) return false;  if (c <= 0x03CE) return true;
		if (c < 0x03D0) return false;  if (c <= 0x03D6) return true;
		if (c == 0x03DA) return true;
		if (c == 0x03DC) return true;
		if (c == 0x03DE) return true;
		if (c == 0x03E0) return true;
		if (c < 0x03E2) return false;  if (c <= 0x03F3) return true;
		if (c < 0x0401) return false;  if (c <= 0x040C) return true;
		if (c < 0x040E) return false;  if (c <= 0x044F) return true;
		if (c < 0x0451) return false;  if (c <= 0x045C) return true;
		if (c < 0x045E) return false;  if (c <= 0x0481) return true;
		if (c < 0x0490) return false;  if (c <= 0x04C4) return true;
		if (c < 0x04C7) return false;  if (c <= 0x04C8) return true;
		if (c < 0x04CB) return false;  if (c <= 0x04CC) return true;
		if (c < 0x04D0) return false;  if (c <= 0x04EB) return true;
		if (c < 0x04EE) return false;  if (c <= 0x04F5) return true;
		if (c < 0x04F8) return false;  if (c <= 0x04F9) return true;
		if (c < 0x0531) return false;  if (c <= 0x0556) return true;
		if (c == 0x0559) return true;
		if (c < 0x0561) return false;  if (c <= 0x0586) return true;
		if (c < 0x05D0) return false;  if (c <= 0x05EA) return true;
		if (c < 0x05F0) return false;  if (c <= 0x05F2) return true;
		if (c < 0x0621) return false;  if (c <= 0x063A) return true;
		if (c < 0x0641) return false;  if (c <= 0x064A) return true;
		if (c < 0x0671) return false;  if (c <= 0x06B7) return true;
		if (c < 0x06BA) return false;  if (c <= 0x06BE) return true;
		if (c < 0x06C0) return false;  if (c <= 0x06CE) return true;
		if (c < 0x06D0) return false;  if (c <= 0x06D3) return true;
		if (c == 0x06D5) return true;
		if (c < 0x06E5) return false;  if (c <= 0x06E6) return true;
		if (c < 0x0905) return false;  if (c <= 0x0939) return true;
		if (c == 0x093D) return true;
		if (c < 0x0958) return false;  if (c <= 0x0961) return true;
		if (c < 0x0985) return false;  if (c <= 0x098C) return true;
		if (c < 0x098F) return false;  if (c <= 0x0990) return true;
		if (c < 0x0993) return false;  if (c <= 0x09A8) return true;
		if (c < 0x09AA) return false;  if (c <= 0x09B0) return true;
		if (c == 0x09B2) return true;
		if (c < 0x09B6) return false;  if (c <= 0x09B9) return true;
		if (c < 0x09DC) return false;  if (c <= 0x09DD) return true;
		if (c < 0x09DF) return false;  if (c <= 0x09E1) return true;
		if (c < 0x09F0) return false;  if (c <= 0x09F1) return true;
		if (c < 0x0A05) return false;  if (c <= 0x0A0A) return true;
		if (c < 0x0A0F) return false;  if (c <= 0x0A10) return true;
		if (c < 0x0A13) return false;  if (c <= 0x0A28) return true;
		if (c < 0x0A2A) return false;  if (c <= 0x0A30) return true;
		if (c < 0x0A32) return false;  if (c <= 0x0A33) return true;
		if (c < 0x0A35) return false;  if (c <= 0x0A36) return true;
		if (c < 0x0A38) return false;  if (c <= 0x0A39) return true;
		if (c < 0x0A59) return false;  if (c <= 0x0A5C) return true;
		if (c == 0x0A5E) return true;
		if (c < 0x0A72) return false;  if (c <= 0x0A74) return true;
		if (c < 0x0A85) return false;  if (c <= 0x0A8B) return true;
		if (c == 0x0A8D) return true;
		if (c < 0x0A8F) return false;  if (c <= 0x0A91) return true;
		if (c < 0x0A93) return false;  if (c <= 0x0AA8) return true;
		if (c < 0x0AAA) return false;  if (c <= 0x0AB0) return true;
		if (c < 0x0AB2) return false;  if (c <= 0x0AB3) return true;
		if (c < 0x0AB5) return false;  if (c <= 0x0AB9) return true;
		if (c == 0x0ABD) return true;
		if (c == 0x0AE0) return true;
		if (c < 0x0B05) return false;  if (c <= 0x0B0C) return true;
		if (c < 0x0B0F) return false;  if (c <= 0x0B10) return true;
		if (c < 0x0B13) return false;  if (c <= 0x0B28) return true;
		if (c < 0x0B2A) return false;  if (c <= 0x0B30) return true;
		if (c < 0x0B32) return false;  if (c <= 0x0B33) return true;
		if (c < 0x0B36) return false;  if (c <= 0x0B39) return true;
		if (c == 0x0B3D) return true;
		if (c < 0x0B5C) return false;  if (c <= 0x0B5D) return true;
		if (c < 0x0B5F) return false;  if (c <= 0x0B61) return true;
		if (c < 0x0B85) return false;  if (c <= 0x0B8A) return true;
		if (c < 0x0B8E) return false;  if (c <= 0x0B90) return true;
		if (c < 0x0B92) return false;  if (c <= 0x0B95) return true;
		if (c < 0x0B99) return false;  if (c <= 0x0B9A) return true;
		if (c == 0x0B9C) return true;
		if (c < 0x0B9E) return false;  if (c <= 0x0B9F) return true;
		if (c < 0x0BA3) return false;  if (c <= 0x0BA4) return true;
		if (c < 0x0BA8) return false;  if (c <= 0x0BAA) return true;
		if (c < 0x0BAE) return false;  if (c <= 0x0BB5) return true;
		if (c < 0x0BB7) return false;  if (c <= 0x0BB9) return true;
		if (c < 0x0C05) return false;  if (c <= 0x0C0C) return true;
		if (c < 0x0C0E) return false;  if (c <= 0x0C10) return true;
		if (c < 0x0C12) return false;  if (c <= 0x0C28) return true;
		if (c < 0x0C2A) return false;  if (c <= 0x0C33) return true;
		if (c < 0x0C35) return false;  if (c <= 0x0C39) return true;
		if (c < 0x0C60) return false;  if (c <= 0x0C61) return true;
		if (c < 0x0C85) return false;  if (c <= 0x0C8C) return true;
		if (c < 0x0C8E) return false;  if (c <= 0x0C90) return true;
		if (c < 0x0C92) return false;  if (c <= 0x0CA8) return true;
		if (c < 0x0CAA) return false;  if (c <= 0x0CB3) return true;
		if (c < 0x0CB5) return false;  if (c <= 0x0CB9) return true;
		if (c == 0x0CDE) return true;
		if (c < 0x0CE0) return false;  if (c <= 0x0CE1) return true;
		if (c < 0x0D05) return false;  if (c <= 0x0D0C) return true;
		if (c < 0x0D0E) return false;  if (c <= 0x0D10) return true;
		if (c < 0x0D12) return false;  if (c <= 0x0D28) return true;
		if (c < 0x0D2A) return false;  if (c <= 0x0D39) return true;
		if (c < 0x0D60) return false;  if (c <= 0x0D61) return true;
		if (c < 0x0E01) return false;  if (c <= 0x0E2E) return true;
		if (c == 0x0E30) return true;
		if (c < 0x0E32) return false;  if (c <= 0x0E33) return true;
		if (c < 0x0E40) return false;  if (c <= 0x0E45) return true;
		if (c < 0x0E81) return false;  if (c <= 0x0E82) return true;
		if (c == 0x0E84) return true;
		if (c < 0x0E87) return false;  if (c <= 0x0E88) return true;
		if (c == 0x0E8A) return true;
		if (c == 0x0E8D) return true;
		if (c < 0x0E94) return false;  if (c <= 0x0E97) return true;
		if (c < 0x0E99) return false;  if (c <= 0x0E9F) return true;
		if (c < 0x0EA1) return false;  if (c <= 0x0EA3) return true;
		if (c == 0x0EA5) return true;
		if (c == 0x0EA7) return true;
		if (c < 0x0EAA) return false;  if (c <= 0x0EAB) return true;
		if (c < 0x0EAD) return false;  if (c <= 0x0EAE) return true;
		if (c == 0x0EB0) return true;
		if (c < 0x0EB2) return false;  if (c <= 0x0EB3) return true;
		if (c == 0x0EBD) return true;
		if (c < 0x0EC0) return false;  if (c <= 0x0EC4) return true;
		if (c < 0x0F40) return false;  if (c <= 0x0F47) return true;
		if (c < 0x0F49) return false;  if (c <= 0x0F69) return true;
		if (c < 0x10A0) return false;  if (c <= 0x10C5) return true;
		if (c < 0x10D0) return false;  if (c <= 0x10F6) return true;
		if (c == 0x1100) return true;
		if (c < 0x1102) return false;  if (c <= 0x1103) return true;
		if (c < 0x1105) return false;  if (c <= 0x1107) return true;
		if (c == 0x1109) return true;
		if (c < 0x110B) return false;  if (c <= 0x110C) return true;
		if (c < 0x110E) return false;  if (c <= 0x1112) return true;
		if (c == 0x113C) return true;
		if (c == 0x113E) return true;
		if (c == 0x1140) return true;
		if (c == 0x114C) return true;
		if (c == 0x114E) return true;
		if (c == 0x1150) return true;
		if (c < 0x1154) return false;  if (c <= 0x1155) return true;
		if (c == 0x1159) return true;
		if (c < 0x115F) return false;  if (c <= 0x1161) return true;
		if (c == 0x1163) return true;
		if (c == 0x1165) return true;
		if (c == 0x1167) return true;
		if (c == 0x1169) return true;
		if (c < 0x116D) return false;  if (c <= 0x116E) return true;
		if (c < 0x1172) return false;  if (c <= 0x1173) return true;
		if (c == 0x1175) return true;
		if (c == 0x119E) return true;
		if (c == 0x11A8) return true;
		if (c == 0x11AB) return true;
		if (c < 0x11AE) return false;  if (c <= 0x11AF) return true;
		if (c < 0x11B7) return false;  if (c <= 0x11B8) return true;
		if (c == 0x11BA) return true;
		if (c < 0x11BC) return false;  if (c <= 0x11C2) return true;
		if (c == 0x11EB) return true;
		if (c == 0x11F0) return true;
		if (c == 0x11F9) return true;
		if (c < 0x1E00) return false;  if (c <= 0x1E9B) return true;
		if (c < 0x1EA0) return false;  if (c <= 0x1EF9) return true;
		if (c < 0x1F00) return false;  if (c <= 0x1F15) return true;
		if (c < 0x1F18) return false;  if (c <= 0x1F1D) return true;
		if (c < 0x1F20) return false;  if (c <= 0x1F45) return true;
		if (c < 0x1F48) return false;  if (c <= 0x1F4D) return true;
		if (c < 0x1F50) return false;  if (c <= 0x1F57) return true;
		if (c == 0x1F59) return true;
		if (c == 0x1F5B) return true;
		if (c == 0x1F5D) return true;
		if (c < 0x1F5F) return false;  if (c <= 0x1F7D) return true;
		if (c < 0x1F80) return false;  if (c <= 0x1FB4) return true;
		if (c < 0x1FB6) return false;  if (c <= 0x1FBC) return true;
		if (c == 0x1FBE) return true;
		if (c < 0x1FC2) return false;  if (c <= 0x1FC4) return true;
		if (c < 0x1FC6) return false;  if (c <= 0x1FCC) return true;
		if (c < 0x1FD0) return false;  if (c <= 0x1FD3) return true;
		if (c < 0x1FD6) return false;  if (c <= 0x1FDB) return true;
		if (c < 0x1FE0) return false;  if (c <= 0x1FEC) return true;
		if (c < 0x1FF2) return false;  if (c <= 0x1FF4) return true;
		if (c < 0x1FF6) return false;  if (c <= 0x1FFC) return true;
		if (c == 0x2126) return true;
		if (c < 0x212A) return false;  if (c <= 0x212B) return true;
		if (c == 0x212E) return true;
		if (c < 0x2180) return false;  if (c <= 0x2182) return true;
		if (c == 0x3007) return true;                          // ideographic
		if (c < 0x3021) return false;  if (c <= 0x3029) return true;  // ideo
		if (c < 0x3041) return false;  if (c <= 0x3094) return true;
		if (c < 0x30A1) return false;  if (c <= 0x30FA) return true;
		if (c < 0x3105) return false;  if (c <= 0x312C) return true;
		if (c < 0x4E00) return false;  if (c <= 0x9FA5) return true;  // ideo
		if (c < 0xAC00) return false;  if (c <= 0xD7A3) return true;

		return false;

	}

	/**
	 * This is a utility function for determining whether a specified character
	 * is a combining character according to production 87
	 * of the XML 1.0 specification.
	 *
	 * @param c <code>char</code> to check.
	 * @return <code>boolean</code> true if it's a combining character,
	 *         false otherwise.
	 */
	public static boolean isXMLCombiningChar(final char c) {
		// CombiningChar
		if (c < 0x0300) return false;  if (c <= 0x0345) return true;
		if (c < 0x0360) return false;  if (c <= 0x0361) return true;
		if (c < 0x0483) return false;  if (c <= 0x0486) return true;
		if (c < 0x0591) return false;  if (c <= 0x05A1) return true;

		if (c < 0x05A3) return false;  if (c <= 0x05B9) return true;
		if (c < 0x05BB) return false;  if (c <= 0x05BD) return true;
		if (c == 0x05BF) return true;
		if (c < 0x05C1) return false;  if (c <= 0x05C2) return true;

		if (c == 0x05C4) return true;
		if (c < 0x064B) return false;  if (c <= 0x0652) return true;
		if (c == 0x0670) return true;
		if (c < 0x06D6) return false;  if (c <= 0x06DC) return true;

		if (c < 0x06DD) return false;  if (c <= 0x06DF) return true;
		if (c < 0x06E0) return false;  if (c <= 0x06E4) return true;
		if (c < 0x06E7) return false;  if (c <= 0x06E8) return true;

		if (c < 0x06EA) return false;  if (c <= 0x06ED) return true;
		if (c < 0x0901) return false;  if (c <= 0x0903) return true;
		if (c == 0x093C) return true;
		if (c < 0x093E) return false;  if (c <= 0x094C) return true;

		if (c == 0x094D) return true;
		if (c < 0x0951) return false;  if (c <= 0x0954) return true;
		if (c < 0x0962) return false;  if (c <= 0x0963) return true;
		if (c < 0x0981) return false;  if (c <= 0x0983) return true;

		if (c == 0x09BC) return true;
		if (c == 0x09BE) return true;
		if (c == 0x09BF) return true;
		if (c < 0x09C0) return false;  if (c <= 0x09C4) return true;
		if (c < 0x09C7) return false;  if (c <= 0x09C8) return true;

		if (c < 0x09CB) return false;  if (c <= 0x09CD) return true;
		if (c == 0x09D7) return true;
		if (c < 0x09E2) return false;  if (c <= 0x09E3) return true;
		if (c == 0x0A02) return true;
		if (c == 0x0A3C) return true;

		if (c == 0x0A3E) return true;
		if (c == 0x0A3F) return true;
		if (c < 0x0A40) return false;  if (c <= 0x0A42) return true;
		if (c < 0x0A47) return false;  if (c <= 0x0A48) return true;

		if (c < 0x0A4B) return false;  if (c <= 0x0A4D) return true;
		if (c < 0x0A70) return false;  if (c <= 0x0A71) return true;
		if (c < 0x0A81) return false;  if (c <= 0x0A83) return true;
		if (c == 0x0ABC) return true;

		if (c < 0x0ABE) return false;  if (c <= 0x0AC5) return true;
		if (c < 0x0AC7) return false;  if (c <= 0x0AC9) return true;
		if (c < 0x0ACB) return false;  if (c <= 0x0ACD) return true;

		if (c < 0x0B01) return false;  if (c <= 0x0B03) return true;
		if (c == 0x0B3C) return true;
		if (c < 0x0B3E) return false;  if (c <= 0x0B43) return true;
		if (c < 0x0B47) return false;  if (c <= 0x0B48) return true;

		if (c < 0x0B4B) return false;  if (c <= 0x0B4D) return true;
		if (c < 0x0B56) return false;  if (c <= 0x0B57) return true;
		if (c < 0x0B82) return false;  if (c <= 0x0B83) return true;

		if (c < 0x0BBE) return false;  if (c <= 0x0BC2) return true;
		if (c < 0x0BC6) return false;  if (c <= 0x0BC8) return true;
		if (c < 0x0BCA) return false;  if (c <= 0x0BCD) return true;
		if (c == 0x0BD7) return true;

		if (c < 0x0C01) return false;  if (c <= 0x0C03) return true;
		if (c < 0x0C3E) return false;  if (c <= 0x0C44) return true;
		if (c < 0x0C46) return false;  if (c <= 0x0C48) return true;

		if (c < 0x0C4A) return false;  if (c <= 0x0C4D) return true;
		if (c < 0x0C55) return false;  if (c <= 0x0C56) return true;
		if (c < 0x0C82) return false;  if (c <= 0x0C83) return true;

		if (c < 0x0CBE) return false;  if (c <= 0x0CC4) return true;
		if (c < 0x0CC6) return false;  if (c <= 0x0CC8) return true;
		if (c < 0x0CCA) return false;  if (c <= 0x0CCD) return true;

		if (c < 0x0CD5) return false;  if (c <= 0x0CD6) return true;
		if (c < 0x0D02) return false;  if (c <= 0x0D03) return true;
		if (c < 0x0D3E) return false;  if (c <= 0x0D43) return true;

		if (c < 0x0D46) return false;  if (c <= 0x0D48) return true;
		if (c < 0x0D4A) return false;  if (c <= 0x0D4D) return true;
		if (c == 0x0D57) return true;
		if (c == 0x0E31) return true;

		if (c < 0x0E34) return false;  if (c <= 0x0E3A) return true;
		if (c < 0x0E47) return false;  if (c <= 0x0E4E) return true;
		if (c == 0x0EB1) return true;
		if (c < 0x0EB4) return false;  if (c <= 0x0EB9) return true;

		if (c < 0x0EBB) return false;  if (c <= 0x0EBC) return true;
		if (c < 0x0EC8) return false;  if (c <= 0x0ECD) return true;
		if (c < 0x0F18) return false;  if (c <= 0x0F19) return true;
		if (c == 0x0F35) return true;

		if (c == 0x0F37) return true;
		if (c == 0x0F39) return true;
		if (c == 0x0F3E) return true;
		if (c == 0x0F3F) return true;
		if (c < 0x0F71) return false;  if (c <= 0x0F84) return true;

		if (c < 0x0F86) return false;  if (c <= 0x0F8B) return true;
		if (c < 0x0F90) return false;  if (c <= 0x0F95) return true;
		if (c == 0x0F97) return true;
		if (c < 0x0F99) return false;  if (c <= 0x0FAD) return true;

		if (c < 0x0FB1) return false;  if (c <= 0x0FB7) return true;
		if (c == 0x0FB9) return true;
		if (c < 0x20D0) return false;  if (c <= 0x20DC) return true;
		if (c == 0x20E1) return true;

		if (c < 0x302A) return false;  if (c <= 0x302F) return true;
		if (c == 0x3099) return true;
		if (c == 0x309A) return true; 

		return false;

	}

	/**
	 * This is a utility function for determining whether a specified 
	 * Unicode character
	 * is a digit according to production 88 of the XML 1.0 specification.
	 *
	 * @param c <code>char</code> to check for XML digit compliance
	 * @return <code>boolean</code> true if it's a digit, false otherwise
	 */
	public static boolean isXMLDigit(final char c) {

		if (c < 0x0030) return false;  if (c <= 0x0039) return true;
		if (c < 0x0660) return false;  if (c <= 0x0669) return true;
		if (c < 0x06F0) return false;  if (c <= 0x06F9) return true;
		if (c < 0x0966) return false;  if (c <= 0x096F) return true;

		if (c < 0x09E6) return false;  if (c <= 0x09EF) return true;
		if (c < 0x0A66) return false;  if (c <= 0x0A6F) return true;
		if (c < 0x0AE6) return false;  if (c <= 0x0AEF) return true;

		if (c < 0x0B66) return false;  if (c <= 0x0B6F) return true;
		if (c < 0x0BE7) return false;  if (c <= 0x0BEF) return true;
		if (c < 0x0C66) return false;  if (c <= 0x0C6F) return true;

		if (c < 0x0CE6) return false;  if (c <= 0x0CEF) return true;
		if (c < 0x0D66) return false;  if (c <= 0x0D6F) return true;
		if (c < 0x0E50) return false;  if (c <= 0x0E59) return true;

		if (c < 0x0ED0) return false;  if (c <= 0x0ED9) return true;
		if (c < 0x0F20) return false;  if (c <= 0x0F29) return true; 

		return false;
	}  
	
}
