1/*
2 * Copyright (C) 2014 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
17#include "minikin/Emoji.h"
18
19namespace minikin {
20
21bool isNewEmoji(uint32_t c) {
22    // Emoji characters new in Unicode emoji 11
23    // From https://www.unicode.org/Public/emoji/11.0/emoji-data.txt
24    // TODO: Remove once emoji-data.text 11 is in ICU or update to 11.
25    if (c < 0x1F6F9 || c > 0x1F9FF) {
26        // Optimization for characters outside the new emoji range.
27        return false;
28    }
29    return c == 0x265F || c == 0x267E || c == 0x1F6F9 || (0x1F94D <= c && c <= 0x1F94F) ||
30           (0x1F96C <= c && c <= 0x1F970) || (0x1F973 <= c && c <= 0x1F976) || c == 0x1F97A ||
31           (0x1F97C <= c && c <= 0x1F97F) || (0x1F998 <= c && c <= 0x1F9A2) ||
32           (0x1F9B0 <= c && c <= 0x1F9B9) || (0x1F9C1 <= c && c <= 0x1F9C2) ||
33           (0x1F9E7 <= c && c <= 0x1F9FF);
34}
35
36bool isEmoji(uint32_t c) {
37    return isNewEmoji(c) || u_hasBinaryProperty(c, UCHAR_EMOJI);
38}
39
40bool isEmojiModifier(uint32_t c) {
41    // Emoji modifier are not expected to change, so there's a small change we need to customize
42    // this.
43    return u_hasBinaryProperty(c, UCHAR_EMOJI_MODIFIER);
44}
45
46bool isEmojiBase(uint32_t c) {
47    // These two characters were removed from Emoji_Modifier_Base in Emoji 4.0, but we need to keep
48    // them as emoji modifier bases since there are fonts and user-generated text out there that
49    // treats these as potential emoji bases.
50    if (c == 0x1F91D || c == 0x1F93C) {
51        return true;
52    }
53    // Emoji Modifier Base characters new in Unicode emoji 11
54    // From https://www.unicode.org/Public/emoji/11.0/emoji-data.txt
55    // TODO: Remove once emoji-data.text 11 is in ICU or update to 11.
56    if ((0x1F9B5 <= c && c <= 0x1F9B6) || (0x1F9B8 <= c && c <= 0x1F9B9)) {
57        return true;
58    }
59    return u_hasBinaryProperty(c, UCHAR_EMOJI_MODIFIER_BASE);
60}
61
62UCharDirection emojiBidiOverride(const void* /* context */, UChar32 c) {
63    if (isNewEmoji(c)) {
64        // All new emoji characters in Unicode 10.0 are of the bidi class ON.
65        return U_OTHER_NEUTRAL;
66    } else {
67        return u_charDirection(c);
68    }
69}
70
71}  // namespace minikin
72