1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package android.text;
18
19import java.util.Arrays;
20
21/**
22 * An utility class for Emoji.
23 * @hide
24 */
25public class Emoji {
26    // See http://www.unicode.org/Public/emoji/3.0/emoji-data.txt
27    // TODO: Generate from external/unicode/emoji-data.txt
28    private static int[] EMOJI_LIST = {
29        0x0023, 0x002A, 0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037, 0x0038,
30        0x0039, 0x00A9, 0x00AE, 0x203C, 0x2049, 0x2122, 0x2139, 0x2194, 0x2195, 0x2196, 0x2197,
31        0x2198, 0x2199, 0x21A9, 0x21AA, 0x231A, 0x231B, 0x2328, 0x23CF, 0x23E9, 0x23EA, 0x23EB,
32        0x23EC, 0x23ED, 0x23EE, 0x23EF, 0x23F0, 0x23F1, 0x23F2, 0x23F3, 0x23F8, 0x23F9, 0x23FA,
33        0x24C2, 0x25AA, 0x25AB, 0x25B6, 0x25C0, 0x25FB, 0x25FC, 0x25FD, 0x25FE, 0x2600, 0x2601,
34        0x2602, 0x2603, 0x2604, 0x260E, 0x2611, 0x2614, 0x2615, 0x2618, 0x261D, 0x2620, 0x2622,
35        0x2623, 0x2626, 0x262A, 0x262E, 0x262F, 0x2638, 0x2639, 0x263A, 0x2648, 0x2649, 0x264A,
36        0x264B, 0x264C, 0x264D, 0x264E, 0x264F, 0x2650, 0x2651, 0x2652, 0x2653, 0x2660, 0x2663,
37        0x2665, 0x2666, 0x2668, 0x267B, 0x267F, 0x2692, 0x2693, 0x2694, 0x2696, 0x2697, 0x2699,
38        0x269B, 0x269C, 0x26A0, 0x26A1, 0x26AA, 0x26AB, 0x26B0, 0x26B1, 0x26BD, 0x26BE, 0x26C4,
39        0x26C5, 0x26C8, 0x26CE, 0x26CF, 0x26D1, 0x26D3, 0x26D4, 0x26E9, 0x26EA, 0x26F0, 0x26F1,
40        0x26F2, 0x26F3, 0x26F4, 0x26F5, 0x26F7, 0x26F8, 0x26F9, 0x26FA, 0x26FD, 0x2702, 0x2705,
41        0x2708, 0x2709, 0x270A, 0x270B, 0x270C, 0x270D, 0x270F, 0x2712, 0x2714, 0x2716, 0x271D,
42        0x2721, 0x2728, 0x2733, 0x2734, 0x2744, 0x2747, 0x274C, 0x274E, 0x2753, 0x2754, 0x2755,
43        0x2757, 0x2763, 0x2764, 0x2795, 0x2796, 0x2797, 0x27A1, 0x27B0, 0x27BF, 0x2934, 0x2935,
44        0x2B05, 0x2B06, 0x2B07, 0x2B1B, 0x2B1C, 0x2B50, 0x2B55, 0x3030, 0x303D, 0x3297, 0x3299,
45        0x1F004, 0x1F0CF, 0x1F170, 0x1F171, 0x1F17E, 0x1F17F, 0x1F18E, 0x1F191, 0x1F192, 0x1F193,
46        0x1F194, 0x1F195, 0x1F196, 0x1F197, 0x1F198, 0x1F199, 0x1F19A, 0x1F1E6, 0x1F1E7, 0x1F1E8,
47        0x1F1E9, 0x1F1EA, 0x1F1EB, 0x1F1EC, 0x1F1ED, 0x1F1EE, 0x1F1EF, 0x1F1F0, 0x1F1F1, 0x1F1F2,
48        0x1F1F3, 0x1F1F4, 0x1F1F5, 0x1F1F6, 0x1F1F7, 0x1F1F8, 0x1F1F9, 0x1F1FA, 0x1F1FB, 0x1F1FC,
49        0x1F1FD, 0x1F1FE, 0x1F1FF, 0x1F201, 0x1F202, 0x1F21A, 0x1F22F, 0x1F232, 0x1F233, 0x1F234,
50        0x1F235, 0x1F236, 0x1F237, 0x1F238, 0x1F239, 0x1F23A, 0x1F250, 0x1F251, 0x1F300, 0x1F301,
51        0x1F302, 0x1F303, 0x1F304, 0x1F305, 0x1F306, 0x1F307, 0x1F308, 0x1F309, 0x1F30A, 0x1F30B,
52        0x1F30C, 0x1F30D, 0x1F30E, 0x1F30F, 0x1F310, 0x1F311, 0x1F312, 0x1F313, 0x1F314, 0x1F315,
53        0x1F316, 0x1F317, 0x1F318, 0x1F319, 0x1F31A, 0x1F31B, 0x1F31C, 0x1F31D, 0x1F31E, 0x1F31F,
54        0x1F320, 0x1F321, 0x1F324, 0x1F325, 0x1F326, 0x1F327, 0x1F328, 0x1F329, 0x1F32A, 0x1F32B,
55        0x1F32C, 0x1F32D, 0x1F32E, 0x1F32F, 0x1F330, 0x1F331, 0x1F332, 0x1F333, 0x1F334, 0x1F335,
56        0x1F336, 0x1F337, 0x1F338, 0x1F339, 0x1F33A, 0x1F33B, 0x1F33C, 0x1F33D, 0x1F33E, 0x1F33F,
57        0x1F340, 0x1F341, 0x1F342, 0x1F343, 0x1F344, 0x1F345, 0x1F346, 0x1F347, 0x1F348, 0x1F349,
58        0x1F34A, 0x1F34B, 0x1F34C, 0x1F34D, 0x1F34E, 0x1F34F, 0x1F350, 0x1F351, 0x1F352, 0x1F353,
59        0x1F354, 0x1F355, 0x1F356, 0x1F357, 0x1F358, 0x1F359, 0x1F35A, 0x1F35B, 0x1F35C, 0x1F35D,
60        0x1F35E, 0x1F35F, 0x1F360, 0x1F361, 0x1F362, 0x1F363, 0x1F364, 0x1F365, 0x1F366, 0x1F367,
61        0x1F368, 0x1F369, 0x1F36A, 0x1F36B, 0x1F36C, 0x1F36D, 0x1F36E, 0x1F36F, 0x1F370, 0x1F371,
62        0x1F372, 0x1F373, 0x1F374, 0x1F375, 0x1F376, 0x1F377, 0x1F378, 0x1F379, 0x1F37A, 0x1F37B,
63        0x1F37C, 0x1F37D, 0x1F37E, 0x1F37F, 0x1F380, 0x1F381, 0x1F382, 0x1F383, 0x1F384, 0x1F385,
64        0x1F386, 0x1F387, 0x1F388, 0x1F389, 0x1F38A, 0x1F38B, 0x1F38C, 0x1F38D, 0x1F38E, 0x1F38F,
65        0x1F390, 0x1F391, 0x1F392, 0x1F393, 0x1F396, 0x1F397, 0x1F399, 0x1F39A, 0x1F39B, 0x1F39E,
66        0x1F39F, 0x1F3A0, 0x1F3A1, 0x1F3A2, 0x1F3A3, 0x1F3A4, 0x1F3A5, 0x1F3A6, 0x1F3A7, 0x1F3A8,
67        0x1F3A9, 0x1F3AA, 0x1F3AB, 0x1F3AC, 0x1F3AD, 0x1F3AE, 0x1F3AF, 0x1F3B0, 0x1F3B1, 0x1F3B2,
68        0x1F3B3, 0x1F3B4, 0x1F3B5, 0x1F3B6, 0x1F3B7, 0x1F3B8, 0x1F3B9, 0x1F3BA, 0x1F3BB, 0x1F3BC,
69        0x1F3BD, 0x1F3BE, 0x1F3BF, 0x1F3C0, 0x1F3C1, 0x1F3C2, 0x1F3C3, 0x1F3C4, 0x1F3C5, 0x1F3C6,
70        0x1F3C7, 0x1F3C8, 0x1F3C9, 0x1F3CA, 0x1F3CB, 0x1F3CC, 0x1F3CD, 0x1F3CE, 0x1F3CF, 0x1F3D0,
71        0x1F3D1, 0x1F3D2, 0x1F3D3, 0x1F3D4, 0x1F3D5, 0x1F3D6, 0x1F3D7, 0x1F3D8, 0x1F3D9, 0x1F3DA,
72        0x1F3DB, 0x1F3DC, 0x1F3DD, 0x1F3DE, 0x1F3DF, 0x1F3E0, 0x1F3E1, 0x1F3E2, 0x1F3E3, 0x1F3E4,
73        0x1F3E5, 0x1F3E6, 0x1F3E7, 0x1F3E8, 0x1F3E9, 0x1F3EA, 0x1F3EB, 0x1F3EC, 0x1F3ED, 0x1F3EE,
74        0x1F3EF, 0x1F3F0, 0x1F3F3, 0x1F3F4, 0x1F3F5, 0x1F3F7, 0x1F3F8, 0x1F3F9, 0x1F3FA, 0x1F3FB,
75        0x1F3FC, 0x1F3FD, 0x1F3FE, 0x1F3FF, 0x1F400, 0x1F401, 0x1F402, 0x1F403, 0x1F404, 0x1F405,
76        0x1F406, 0x1F407, 0x1F408, 0x1F409, 0x1F40A, 0x1F40B, 0x1F40C, 0x1F40D, 0x1F40E, 0x1F40F,
77        0x1F410, 0x1F411, 0x1F412, 0x1F413, 0x1F414, 0x1F415, 0x1F416, 0x1F417, 0x1F418, 0x1F419,
78        0x1F41A, 0x1F41B, 0x1F41C, 0x1F41D, 0x1F41E, 0x1F41F, 0x1F420, 0x1F421, 0x1F422, 0x1F423,
79        0x1F424, 0x1F425, 0x1F426, 0x1F427, 0x1F428, 0x1F429, 0x1F42A, 0x1F42B, 0x1F42C, 0x1F42D,
80        0x1F42E, 0x1F42F, 0x1F430, 0x1F431, 0x1F432, 0x1F433, 0x1F434, 0x1F435, 0x1F436, 0x1F437,
81        0x1F438, 0x1F439, 0x1F43A, 0x1F43B, 0x1F43C, 0x1F43D, 0x1F43E, 0x1F43F, 0x1F440, 0x1F441,
82        0x1F442, 0x1F443, 0x1F444, 0x1F445, 0x1F446, 0x1F447, 0x1F448, 0x1F449, 0x1F44A, 0x1F44B,
83        0x1F44C, 0x1F44D, 0x1F44E, 0x1F44F, 0x1F450, 0x1F451, 0x1F452, 0x1F453, 0x1F454, 0x1F455,
84        0x1F456, 0x1F457, 0x1F458, 0x1F459, 0x1F45A, 0x1F45B, 0x1F45C, 0x1F45D, 0x1F45E, 0x1F45F,
85        0x1F460, 0x1F461, 0x1F462, 0x1F463, 0x1F464, 0x1F465, 0x1F466, 0x1F467, 0x1F468, 0x1F469,
86        0x1F46A, 0x1F46B, 0x1F46C, 0x1F46D, 0x1F46E, 0x1F46F, 0x1F470, 0x1F471, 0x1F472, 0x1F473,
87        0x1F474, 0x1F475, 0x1F476, 0x1F477, 0x1F478, 0x1F479, 0x1F47A, 0x1F47B, 0x1F47C, 0x1F47D,
88        0x1F47E, 0x1F47F, 0x1F480, 0x1F481, 0x1F482, 0x1F483, 0x1F484, 0x1F485, 0x1F486, 0x1F487,
89        0x1F488, 0x1F489, 0x1F48A, 0x1F48B, 0x1F48C, 0x1F48D, 0x1F48E, 0x1F48F, 0x1F490, 0x1F491,
90        0x1F492, 0x1F493, 0x1F494, 0x1F495, 0x1F496, 0x1F497, 0x1F498, 0x1F499, 0x1F49A, 0x1F49B,
91        0x1F49C, 0x1F49D, 0x1F49E, 0x1F49F, 0x1F4A0, 0x1F4A1, 0x1F4A2, 0x1F4A3, 0x1F4A4, 0x1F4A5,
92        0x1F4A6, 0x1F4A7, 0x1F4A8, 0x1F4A9, 0x1F4AA, 0x1F4AB, 0x1F4AC, 0x1F4AD, 0x1F4AE, 0x1F4AF,
93        0x1F4B0, 0x1F4B1, 0x1F4B2, 0x1F4B3, 0x1F4B4, 0x1F4B5, 0x1F4B6, 0x1F4B7, 0x1F4B8, 0x1F4B9,
94        0x1F4BA, 0x1F4BB, 0x1F4BC, 0x1F4BD, 0x1F4BE, 0x1F4BF, 0x1F4C0, 0x1F4C1, 0x1F4C2, 0x1F4C3,
95        0x1F4C4, 0x1F4C5, 0x1F4C6, 0x1F4C7, 0x1F4C8, 0x1F4C9, 0x1F4CA, 0x1F4CB, 0x1F4CC, 0x1F4CD,
96        0x1F4CE, 0x1F4CF, 0x1F4D0, 0x1F4D1, 0x1F4D2, 0x1F4D3, 0x1F4D4, 0x1F4D5, 0x1F4D6, 0x1F4D7,
97        0x1F4D8, 0x1F4D9, 0x1F4DA, 0x1F4DB, 0x1F4DC, 0x1F4DD, 0x1F4DE, 0x1F4DF, 0x1F4E0, 0x1F4E1,
98        0x1F4E2, 0x1F4E3, 0x1F4E4, 0x1F4E5, 0x1F4E6, 0x1F4E7, 0x1F4E8, 0x1F4E9, 0x1F4EA, 0x1F4EB,
99        0x1F4EC, 0x1F4ED, 0x1F4EE, 0x1F4EF, 0x1F4F0, 0x1F4F1, 0x1F4F2, 0x1F4F3, 0x1F4F4, 0x1F4F5,
100        0x1F4F6, 0x1F4F7, 0x1F4F8, 0x1F4F9, 0x1F4FA, 0x1F4FB, 0x1F4FC, 0x1F4FD, 0x1F4FF, 0x1F500,
101        0x1F501, 0x1F502, 0x1F503, 0x1F504, 0x1F505, 0x1F506, 0x1F507, 0x1F508, 0x1F509, 0x1F50A,
102        0x1F50B, 0x1F50C, 0x1F50D, 0x1F50E, 0x1F50F, 0x1F510, 0x1F511, 0x1F512, 0x1F513, 0x1F514,
103        0x1F515, 0x1F516, 0x1F517, 0x1F518, 0x1F519, 0x1F51A, 0x1F51B, 0x1F51C, 0x1F51D, 0x1F51E,
104        0x1F51F, 0x1F520, 0x1F521, 0x1F522, 0x1F523, 0x1F524, 0x1F525, 0x1F526, 0x1F527, 0x1F528,
105        0x1F529, 0x1F52A, 0x1F52B, 0x1F52C, 0x1F52D, 0x1F52E, 0x1F52F, 0x1F530, 0x1F531, 0x1F532,
106        0x1F533, 0x1F534, 0x1F535, 0x1F536, 0x1F537, 0x1F538, 0x1F539, 0x1F53A, 0x1F53B, 0x1F53C,
107        0x1F53D, 0x1F549, 0x1F54A, 0x1F54B, 0x1F54C, 0x1F54D, 0x1F54E, 0x1F550, 0x1F551, 0x1F552,
108        0x1F553, 0x1F554, 0x1F555, 0x1F556, 0x1F557, 0x1F558, 0x1F559, 0x1F55A, 0x1F55B, 0x1F55C,
109        0x1F55D, 0x1F55E, 0x1F55F, 0x1F560, 0x1F561, 0x1F562, 0x1F563, 0x1F564, 0x1F565, 0x1F566,
110        0x1F567, 0x1F56F, 0x1F570, 0x1F573, 0x1F574, 0x1F575, 0x1F576, 0x1F577, 0x1F578, 0x1F579,
111        0x1F57A, 0x1F587, 0x1F58A, 0x1F58B, 0x1F58C, 0x1F58D, 0x1F590, 0x1F595, 0x1F596, 0x1F5A4,
112        0x1F5A5, 0x1F5A8, 0x1F5B1, 0x1F5B2, 0x1F5BC, 0x1F5C2, 0x1F5C3, 0x1F5C4, 0x1F5D1, 0x1F5D2,
113        0x1F5D3, 0x1F5DC, 0x1F5DD, 0x1F5DE, 0x1F5E1, 0x1F5E3, 0x1F5E8, 0x1F5EF, 0x1F5F3, 0x1F5FA,
114        0x1F5FB, 0x1F5FC, 0x1F5FD, 0x1F5FE, 0x1F5FF, 0x1F600, 0x1F601, 0x1F602, 0x1F603, 0x1F604,
115        0x1F605, 0x1F606, 0x1F607, 0x1F608, 0x1F609, 0x1F60A, 0x1F60B, 0x1F60C, 0x1F60D, 0x1F60E,
116        0x1F60F, 0x1F610, 0x1F611, 0x1F612, 0x1F613, 0x1F614, 0x1F615, 0x1F616, 0x1F617, 0x1F618,
117        0x1F619, 0x1F61A, 0x1F61B, 0x1F61C, 0x1F61D, 0x1F61E, 0x1F61F, 0x1F620, 0x1F621, 0x1F622,
118        0x1F623, 0x1F624, 0x1F625, 0x1F626, 0x1F627, 0x1F628, 0x1F629, 0x1F62A, 0x1F62B, 0x1F62C,
119        0x1F62D, 0x1F62E, 0x1F62F, 0x1F630, 0x1F631, 0x1F632, 0x1F633, 0x1F634, 0x1F635, 0x1F636,
120        0x1F637, 0x1F638, 0x1F639, 0x1F63A, 0x1F63B, 0x1F63C, 0x1F63D, 0x1F63E, 0x1F63F, 0x1F640,
121        0x1F641, 0x1F642, 0x1F643, 0x1F644, 0x1F645, 0x1F646, 0x1F647, 0x1F648, 0x1F649, 0x1F64A,
122        0x1F64B, 0x1F64C, 0x1F64D, 0x1F64E, 0x1F64F, 0x1F680, 0x1F681, 0x1F682, 0x1F683, 0x1F684,
123        0x1F685, 0x1F686, 0x1F687, 0x1F688, 0x1F689, 0x1F68A, 0x1F68B, 0x1F68C, 0x1F68D, 0x1F68E,
124        0x1F68F, 0x1F690, 0x1F691, 0x1F692, 0x1F693, 0x1F694, 0x1F695, 0x1F696, 0x1F697, 0x1F698,
125        0x1F699, 0x1F69A, 0x1F69B, 0x1F69C, 0x1F69D, 0x1F69E, 0x1F69F, 0x1F6A0, 0x1F6A1, 0x1F6A2,
126        0x1F6A3, 0x1F6A4, 0x1F6A5, 0x1F6A6, 0x1F6A7, 0x1F6A8, 0x1F6A9, 0x1F6AA, 0x1F6AB, 0x1F6AC,
127        0x1F6AD, 0x1F6AE, 0x1F6AF, 0x1F6B0, 0x1F6B1, 0x1F6B2, 0x1F6B3, 0x1F6B4, 0x1F6B5, 0x1F6B6,
128        0x1F6B7, 0x1F6B8, 0x1F6B9, 0x1F6BA, 0x1F6BB, 0x1F6BC, 0x1F6BD, 0x1F6BE, 0x1F6BF, 0x1F6C0,
129        0x1F6C1, 0x1F6C2, 0x1F6C3, 0x1F6C4, 0x1F6C5, 0x1F6CB, 0x1F6CC, 0x1F6CD, 0x1F6CE, 0x1F6CF,
130        0x1F6D0, 0x1F6D1, 0x1F6D2, 0x1F6E0, 0x1F6E1, 0x1F6E2, 0x1F6E3, 0x1F6E4, 0x1F6E5, 0x1F6E9,
131        0x1F6EB, 0x1F6EC, 0x1F6F0, 0x1F6F3, 0x1F6F4, 0x1F6F5, 0x1F6F6, 0x1F910, 0x1F911, 0x1F912,
132        0x1F913, 0x1F914, 0x1F915, 0x1F916, 0x1F917, 0x1F918, 0x1F919, 0x1F91A, 0x1F91B, 0x1F91C,
133        0x1F91D, 0x1F91E, 0x1F920, 0x1F921, 0x1F922, 0x1F923, 0x1F924, 0x1F925, 0x1F926, 0x1F927,
134        0x1F930, 0x1F933, 0x1F934, 0x1F935, 0x1F936, 0x1F937, 0x1F938, 0x1F939, 0x1F93A, 0x1F93B,
135        0x1F93C, 0x1F93D, 0x1F93E, 0x1F940, 0x1F941, 0x1F942, 0x1F943, 0x1F944, 0x1F945, 0x1F946,
136        0x1F947, 0x1F948, 0x1F949, 0x1F94A, 0x1F94B, 0x1F950, 0x1F951, 0x1F952, 0x1F953, 0x1F954,
137        0x1F955, 0x1F956, 0x1F957, 0x1F958, 0x1F959, 0x1F95A, 0x1F95B, 0x1F95C, 0x1F95D, 0x1F95E,
138        0x1F980, 0x1F981, 0x1F982, 0x1F983, 0x1F984, 0x1F985, 0x1F986, 0x1F987, 0x1F988, 0x1F989,
139        0x1F98A, 0x1F98B, 0x1F98C, 0x1F98D, 0x1F98E, 0x1F98F, 0x1F990, 0x1F991, 0x1F9C0
140    };
141
142    // See http://www.unicode.org/Public/emoji/3.0/emoji-data.txt
143    private static int[] EMOJI_MODIFIER_BASE = {
144        0x261D, 0x26F9, 0x270A, 0x270B, 0x270C, 0x270D, 0x1F385, 0x1F3C3, 0x1F3C4, 0x1F3CA,
145        0x1F3CB, 0x1F442, 0x1F443, 0x1F446, 0x1F447, 0x1F448, 0x1F449, 0x1F44A, 0x1F44B, 0x1F44C,
146        0x1F44D, 0x1F44E, 0x1F44F, 0x1F450, 0x1F466, 0x1F467, 0x1F468, 0x1F469, 0x1F46E, 0x1F470,
147        0x1F471, 0x1F472, 0x1F473, 0x1F474, 0x1F475, 0x1F476, 0x1F477, 0x1F478, 0x1F47C, 0x1F481,
148        0x1F482, 0x1F483, 0x1F485, 0x1F486, 0x1F487, 0x1F4AA, 0x1F575, 0x1F57A, 0x1F590, 0x1F595,
149        0x1F596, 0x1F645, 0x1F646, 0x1F647, 0x1F64B, 0x1F64C, 0x1F64D, 0x1F64E, 0x1F64F, 0x1F6A3,
150        0x1F6B4, 0x1F6B5, 0x1F6B6, 0x1F6C0, 0x1F918, 0x1F919, 0x1F91A, 0x1F91B, 0x1F91C, 0x1F91D,
151        0x1F91E, 0x1F926, 0x1F930, 0x1F933, 0x1F934, 0x1F935, 0x1F936, 0x1F937, 0x1F938, 0x1F939,
152        0x1F93B, 0x1F93C, 0x1F93D, 0x1F93E
153    };
154
155    // See http://www.unicode.org/emoji/charts/emoji-zwj-sequences.html
156    private static int[] ZWJ_EMOJI = {
157        0x2764, 0x1F441, 0x1F466, 0x1F467, 0x1F468, 0x1F469, 0x1F48B, 0x1F5E8
158    };
159
160    public static int COMBINING_ENCLOSING_KEYCAP = 0x20E3;
161
162    public static int ZERO_WIDTH_JOINER = 0x200D;
163
164    public static int VARIATION_SELECTOR_16 = 0xFE0F;
165
166    // Returns true if the given code point is regional indicator symbol.
167    public static boolean isRegionalIndicatorSymbol(int codepoint) {
168        return 0x1F1E6 <= codepoint && codepoint <= 0x1F1FF;
169    }
170
171    // Returns true if the given code point is emoji modifier.
172    public static boolean isEmojiModifier(int codepoint) {
173        return 0x1F3FB <= codepoint && codepoint <= 0x1F3FF;
174    }
175
176    // Returns true if the given code point is emoji modifier base.
177    public static boolean isEmojiModifierBase(int codePoint) {
178        return Arrays.binarySearch(EMOJI_MODIFIER_BASE, codePoint) >= 0;
179    }
180
181    // Returns true if the character has Emoji property.
182    public static boolean isEmoji(int codePoint) {
183        return Arrays.binarySearch(EMOJI_LIST, codePoint) >= 0;
184    }
185
186    // Returns true if the character can be a base character of COMBINING ENCLOSING KEYCAP.
187    public static boolean isKeycapBase(int codePoint) {
188        return ('0' <= codePoint && codePoint <= '9') || codePoint == '#' || codePoint == '*';
189    }
190}
191