204 lines
7.8 KiB
Java
204 lines
7.8 KiB
Java
/*
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The contents of this file are subject to the THDL Open Community License
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Version 1.0 (the "License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License on the THDL web site
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(http://www.thdl.org/).
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Software distributed under the License is distributed on an "AS IS" basis,
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WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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License for the specific terms governing rights and limitations under the
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License.
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The Initial Developer of this software is the Tibetan and Himalayan Digital
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Library (THDL). Portions created by the THDL are Copyright 2005 THDL.
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All Rights Reserved.
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Contributor(s): ______________________________________.
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*/
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package org.thdl.tib.text.reverter;
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import java.util.regex.Pattern;
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import java.util.regex.Matcher;
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import org.thdl.util.ThdlDebug;
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import org.thdl.tib.text.THDLWylieConstants;
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import org.thdl.tib.text.tshegbar.UnicodeUtils;
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import org.thdl.tib.text.tshegbar.UnicodeCodepointToThdlWylie;
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/** Grapheme cluster backed by a String of Unicode. For the most part
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* these are <em>combining character sequences</em> as defined by
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* Unicode, but (U+0F04 U+0F05+) [TODO(dchandler): not yet handled as
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* a single GC] is an example of a grapheme cluster that is not a
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* combining character sequence.
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* @author David Chandler
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*/
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class GC {
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/** NFTHDL-decomposed Unicode */
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private String nfthdl;
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/** True if valid. True for digits w/ digit combiners, character
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* stack plus optional wowels, a standalone mark. False for
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* anything else, e.g. "\u0f0b\u0f90". */
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private boolean valid;
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/** Constructor that takes the NFTHDL-decomposed Unicode for the
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* grapheme cluster. */
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public GC(String nfthdl) {
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setNfthdl(nfthdl);
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}
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/** A regex that matches the NFTHDL Unicode for a consonant stack
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* with optional wowels. */
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public static String consonantStackRegexString
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= "[\u0f40-\u0f47\u0f49-\u0f6a]" // base consonant
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+ "[\u0f90-\u0f97\u0f99-\u0fbc\u0f39]*" // subjoined cons.
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+ "\u0f71?" // a-chung
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+ "[\u0f72\u0f73\u0f74\u0f7a-\u0f7d\u0f80]*" // vowel proper
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+ "[\u0f35\u0f37\u0f7e\u0f7f\u0f82-\u0f84" // wowels
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+ "\u0f86\u0f87\u0fc6]*";
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private static Pattern validGcRegex = Pattern.compile(
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"^"
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// numeric:
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+ "([\u0f20-\u0f33][\u0f18\u0f19]*)|"
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// consonant w/ optional wowels:
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+ "(" + consonantStackRegexString + ")|"
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// other symbol with optional U+0FC6
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+ "([\u0f00-\u0f17\u0f1a-\u0f1f\u0f34\u0f36\u0f38"
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+ "\u0f3a-\u0f3d\u0f85\u0f88-\u0f8b\u0fbe-\u0fc5"
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+ "\u0fc7-\u0fcc\u0fcf-\u0fd1]\u0fc6?)|"
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// other symbol that does not take U+0FC6.
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// TODO(dchandler): include 0f0b etc. in this group?
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+ "([ \t\u00a0\n\r]{1,})" // DLC handling of English... [0-9\\.:a-zA-Z] etc. what to do?
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+ "$");
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private static final boolean debug = false;
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/** Returns NFTHDL-decomposed Unicode representing this grapheme
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* cluster. */
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private void setNfthdl(String nfthdl) {
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if (debug) {
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System.out.println("debug: GC is "
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+ UnicodeUtils.unicodeStringToPrettyString(nfthdl));
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}
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this.nfthdl = nfthdl;
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ThdlDebug.verify(nfthdl.length() > 0); // TODO(dchandler): assert only
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if (nfthdl.length() < 1)
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valid = false;
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valid = validGcRegex.matcher(nfthdl).matches();
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}
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/** Returns NFTHDL-decomposed Unicode representing this grapheme
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* cluster. */
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public String getNfthdl() { return nfthdl; }
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/** Returns true iff ch is a vowel proper, not a wowel */
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private boolean isVowel(char ch) {
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// (We won't see \u0f76 etc. in NFTHDL, but the handling of
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// them is suspect.)
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return ((ch >= '\u0f71' && ch <= '\u0f75')
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|| (ch >= '\u0f7a' && ch <= '\u0f7d')
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|| (ch >= '\u0f81' && ch <= '\u0f82'));
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}
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private boolean isWowelRequiringPrecedingVowel(char ch) {
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// not 0f39 0f18 0f19 e.g.
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return ("\u0f35\u0f37\u0f7e\u0f7f\u0f82\u0f83\u0f84\u0f86\u0f87".indexOf(ch) >= 0);
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// NOTE: 0f7f is questionable 0fc6 too... we assume [k\\u0fc6]
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// is good EWTS.
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}
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/** Returns EWTS that is valid but not beautiful. It's better
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* suited for consumption by computer programs than by humans,
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* though it'll do in a pinch. (Humans like to see [rnams] instead
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* of [r+namasa].)
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* @return null if this grapheme cluster has no valid EWTS
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* representation or valid-but-ugly EWTS otherwise */
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public StringBuffer getEwtsForComputers() {
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if (!valid) {
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return null;
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}
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StringBuffer sb = new StringBuffer();
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// We use ch after the loop. Initialization is not really
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// needed; it's just to avoid compiler errors.
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char ch = 'X';
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boolean seenVowel = false;
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String lastEwts = "";
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boolean added_aVOWEL = false;
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for (int i = 0; i < nfthdl.length(); i++) {
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ch = nfthdl.charAt(i);
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String ewts
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= UnicodeCodepointToThdlWylie.getThdlWylieForUnicodeCodepoint(ch);
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if (i + 1 < nfthdl.length()) { // lookahead
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// Even computers want to see kI because the spec
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// isn't (or at least hasn't always been) crystal
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// clear that kA+i is equivalent to kI.
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if (('\u0f55' == ch || '\u0fa5' == ch)
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&& '\u0f39' == nfthdl.charAt(i + 1)) {
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++i;
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ewts = "f"; // TODO(dchandler): hard-coded EWTS
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} else if (('\u0f56' == ch || '\u0fa6' == ch)
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&& '\u0f39' == nfthdl.charAt(i + 1)) {
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++i;
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ewts = "v"; // TODO(dchandler): hard-coded EWTS
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} else if ('\u0f71' == ch && '\u0f72' == nfthdl.charAt(i + 1)) {
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++i;
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ewts = THDLWylieConstants.I_VOWEL;
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// NOTE: we could normalize to 0f73 and 0f75 when
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// possible in NFTHDL. That's closer to EWTS and
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// would avoid these two special cases.
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} else if ('\u0f71' == ch && '\u0f74' == nfthdl.charAt(i + 1)) {
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++i;
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ewts = THDLWylieConstants.U_VOWEL;
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}
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}
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if (null == ewts && UnicodeUtils.isInTibetanRange(ch)) {
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return null;
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}
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if (UnicodeUtils.isSubjoinedConsonant(ch)
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|| (seenVowel && isVowel(ch)))
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sb.append(THDLWylieConstants.WYLIE_SANSKRIT_STACKING_KEY);
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if (isWowelRequiringPrecedingVowel(ch) && !seenVowel) {
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if (!added_aVOWEL) {
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added_aVOWEL = true;
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sb.append(THDLWylieConstants.WYLIE_aVOWEL); // paM, no pM
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}
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}
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if (isVowel(ch)) {
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seenVowel = true;
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if (lastEwts=="a")
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{
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sb.deleteCharAt(sb.length()-1);
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}
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}
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sb.append(ewts);
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lastEwts = ewts;
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}
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if ((UnicodeUtils.isNonSubjoinedConsonant(ch)
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|| UnicodeUtils.isSubjoinedConsonant(ch)
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|| '\u0f39' == ch) && '\u0f68' != ch) {
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ThdlDebug.verify(!added_aVOWEL);
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sb.append(THDLWylieConstants.WYLIE_aVOWEL);
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}
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return sb;
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}
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public int hashCode() { return nfthdl.hashCode(); }
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public boolean equals(Object o) {
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return (o instanceof GC && ((GC)o).getNfthdl().equals(getNfthdl()));
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}
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/** Quasi-XML for humans */
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public String toString() {
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return "<GC valid=" + valid + " pretty=\""
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+ UnicodeUtils.unicodeStringToPrettyString(getNfthdl())
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+ "\"/>";
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}
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}
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