67 lines
2.2 KiB
Java
67 lines
2.2 KiB
Java
/*
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* Copyright 2010 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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public class Surrogate {
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public static final int UCS4_SURROGATE_MIN = 0x10000;
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public static final int UCS4_MAX = (1 << 20) + UCS4_SURROGATE_MIN - 1;
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// UTF-16 surrogate-character ranges
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//
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public static final char MIN_HIGH = '\uD800';
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public static final char MAX_HIGH = '\uDBFF';
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public static final char MIN_LOW = '\uDC00';
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public static final char MAX_LOW = '\uDFFF';
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public static final char MIN = MIN_HIGH;
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public static final char MAX = MAX_LOW;
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public static boolean neededFor(int uc) {
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return (uc >= UCS4_SURROGATE_MIN) && (uc <= UCS4_MAX);
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}
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public static boolean isHigh(int c) {
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return (MIN_HIGH <= c) && (c <= MAX_HIGH);
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}
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static char high(int uc) {
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return (char)(0xd800 | (((uc - UCS4_SURROGATE_MIN) >> 10) & 0x3ff));
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}
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public static boolean isLow(int c) {
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return (MIN_LOW <= c) && (c <= MAX_LOW);
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}
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static char low(int uc) {
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return (char)(0xdc00 | ((uc - UCS4_SURROGATE_MIN) & 0x3ff));
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}
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public static boolean is(int c) {
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return (MIN <= c) && (c <= MAX);
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}
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static int toUCS4(char c, char d) {
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return (((c & 0x3ff) << 10) | (d & 0x3ff)) + 0x10000;
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}
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}
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