1 /* |
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2 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 |
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24 public class Surrogate { |
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25 |
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26 public static final int UCS4_SURROGATE_MIN = 0x10000; |
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27 public static final int UCS4_MAX = (1 << 20) + UCS4_SURROGATE_MIN - 1; |
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28 |
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29 // UTF-16 surrogate-character ranges |
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30 // |
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31 public static final char MIN_HIGH = '\uD800'; |
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32 public static final char MAX_HIGH = '\uDBFF'; |
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33 public static final char MIN_LOW = '\uDC00'; |
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34 public static final char MAX_LOW = '\uDFFF'; |
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35 public static final char MIN = MIN_HIGH; |
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36 public static final char MAX = MAX_LOW; |
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37 |
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38 public static boolean neededFor(int uc) { |
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39 return (uc >= UCS4_SURROGATE_MIN) && (uc <= UCS4_MAX); |
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40 } |
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41 |
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42 public static boolean isHigh(int c) { |
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43 return (MIN_HIGH <= c) && (c <= MAX_HIGH); |
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44 } |
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45 |
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46 static char high(int uc) { |
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47 return (char)(0xd800 | (((uc - UCS4_SURROGATE_MIN) >> 10) & 0x3ff)); |
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48 } |
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49 |
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50 public static boolean isLow(int c) { |
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51 return (MIN_LOW <= c) && (c <= MAX_LOW); |
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52 } |
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53 |
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54 static char low(int uc) { |
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55 return (char)(0xdc00 | ((uc - UCS4_SURROGATE_MIN) & 0x3ff)); |
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56 } |
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57 |
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58 public static boolean is(int c) { |
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59 return (MIN <= c) && (c <= MAX); |
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60 } |
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61 |
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62 static int toUCS4(char c, char d) { |
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63 return (((c & 0x3ff) << 10) | (d & 0x3ff)) + 0x10000; |
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64 } |
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65 |
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66 } |
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