Fix: Size of the single emoji in chat along with updated Emoji Regex

src/libs/EmojiUtils.js

@@ -0,0 +1,75 @@
+import _ from 'underscore';
+import CONST from '../CONST';
+
+/**
+ * Get the unicode code of an emoji in base 16.
+ * @param {String} input
+ * @returns {String}
+ */
+function getEmojiUnicode(input) {
+    if (input.length === 0) {
+        return '';
+    }
+
+    if (input.length === 1) {
+        return _.map(input.charCodeAt(0).toString().split(' '), val => parseInt(val, 10).toString(16)).join(' ');
+    }
+
+    const pairs = [];
+
+    // Some Emojis in UTF-16 are stored as pair of 2 Unicode characters (eg Flags)
+    // The first char is generally between the range U+D800 to U+DBFF called High surrogate
+    // & the second char between the range U+DC00 to U+DFFF called low surrogate
+    // More info in the following links:
+    // 1. https://docs.microsoft.com/en-us/windows/win32/intl/surrogates-and-supplementary-characters
+    // 2. https://thekevinscott.com/emojis-in-javascript/
+    for (let i = 0; i < input.length; i++) {
+        if (input.charCodeAt(i) >= 0xd800 && input.charCodeAt(i) <= 0xdbff) { // high surrogate
+            if (input.charCodeAt(i + 1) >= 0xdc00 && input.charCodeAt(i + 1) <= 0xdfff) { // low surrogate
+                pairs.push(
+                    ((input.charCodeAt(i) - 0xd800) * 0x400)
+                      + (input.charCodeAt(i + 1) - 0xdc00) + 0x10000,
+                );
+            }
+        } else if (input.charCodeAt(i) < 0xd800 || input.charCodeAt(i) > 0xdfff) {
+            // modifiers and joiners
+            pairs.push(input.charCodeAt(i));
+        }
+    }
+    return _.map(pairs, val => parseInt(val, 10).toString(16)).join(' ');
+}
+
+/**
+ * Function to remove Skin Tone and utf16 surrogates from Emoji
+ * @param {String} emojiCode
+ * @returns {String}
+ */
+function trimEmojiUnicode(emojiCode) {
+    return emojiCode.replace(/(fe0f|1f3fb|1f3fc|1f3fd|1f3fe|1f3ff)$/, '').trim();
+}
+
+/**
+ * Validates that this string is composed of a single emoji
+ *
+ * @param {String} message
+ * @returns {Boolean}
+ */
+function isSingleEmoji(message) {
+    const match = message.match(CONST.REGEX.EMOJIS);
+
+    if (!match) {
+        return false;
+    }
+
+    const matchedEmoji = match[0];
+    const matchedUnicode = getEmojiUnicode(matchedEmoji);
+    const currentMessageUnicode = trimEmojiUnicode(getEmojiUnicode(message));
+    return matchedUnicode === currentMessageUnicode;
+}
+
+
+export {
+    getEmojiUnicode,
+    trimEmojiUnicode,
+    isSingleEmoji,
+};

src/libs/ValidationUtils.js

@@ -17,22 +17,6 @@ function isValidAddress(value) {
     return !CONST.REGEX.PO_BOX.test(value);
 }
 
-/**
- * Validates that this string is composed of a single emoji
- *
- * @param {String} message
- * @returns {Boolean}
- */
-function isSingleEmoji(message) {
-    const match = message.match(CONST.REGEX.EMOJIS);
-
-    if (!match) {
-        return false;
-    }
-
-    const matchedEmoji = match[0];
-    return message.length === matchedEmoji.length;
-}
 
 /**
  * Validate date fields
@@ -127,5 +111,4 @@ export {
     isValidIndustryCode,
     isValidIdentity,
     isValidZipCode,
-    isSingleEmoji,
 };

src/pages/home/report/ReportActionItemFragment.js

@@ -9,7 +9,7 @@ import themeColors from '../../../styles/themes/default';
 import RenderHTML from '../../../components/RenderHTML';
 import Text from '../../../components/Text';
 import Tooltip from '../../../components/Tooltip';
-import {isSingleEmoji} from '../../../libs/ValidationUtils';
+import {isSingleEmoji} from '../../../libs/EmojiUtils';
 import withWindowDimensions, {windowDimensionsPropTypes} from '../../../components/withWindowDimensions';
 import withLocalize, {withLocalizePropTypes} from '../../../components/withLocalize';
 import canUseTouchScreen from '../../../libs/canUseTouchscreen';

tests/unit/EmojiRegexTest.js

@@ -0,0 +1,64 @@
+import _ from 'underscore';
+import Emoji from '../../assets/emojis';
+import CONST from '../../src/CONST';
+import {isSingleEmoji} from '../../src/libs/EmojiUtils';
+
+describe('EmojiRegexTest', () => {
+    it('matches all the emojis in the list', () => {
+        // Given the set of Emojis available in the application
+        const emojiMatched = _.every(Emoji, (emoji) => {
+            if (emoji.header === true || emoji.code === CONST.EMOJI_SPACER) {
+                return true;
+            }
+
+            // When we match every Emoji Code
+            const isEmojiMatched = isSingleEmoji(emoji.code);
+            let skinToneMatched = true;
+            if (emoji.types) {
+                // and every skin tone variant of the Emoji code
+                skinToneMatched = _.every(emoji.types, emojiWithSkinTone => isSingleEmoji(emojiWithSkinTone));
+            }
+            return skinToneMatched && isEmojiMatched;
+        });
+
+        // Then it should return true for every Emoji Code
+        expect(emojiMatched).toBe(true);
+    });
+
+    it('matches single emojis variants for size', () => {
+        // GIVEN an emoji that has the default Unicode representation WHEN we check if it's a single emoji THEN it should return true
+        expect(isSingleEmoji('👉')).toBe(true);
+        expect(isSingleEmoji('😪️')).toBe(true);
+        expect(isSingleEmoji('😎️')).toBe(true);
+
+        // GIVEN an emoji that different cross-platform variations WHEN we check if it's a single emoji THEN it should return true
+        expect(isSingleEmoji('🔫️')).toBe(true);
+        expect(isSingleEmoji('🛍')).toBe(true);
+        expect(isSingleEmoji('🕍')).toBe(true);
+
+        // GIVEN an emoji that is symbol/numerical WHEN we check if it's a single emoji THEN it should return true
+        expect(isSingleEmoji('*️⃣')).toBe(true);
+        expect(isSingleEmoji('1️⃣️')).toBe(true);
+
+        // GIVEN an emoji that has text-variant WHEN we check if it's a single emoji THEN it should return true
+        expect(isSingleEmoji('❤️')).toBe(true);
+        expect(isSingleEmoji('⁉️')).toBe(true);
+        expect(isSingleEmoji('✳️')).toBe(true);
+        expect(isSingleEmoji('☠️')).toBe(true);
+
+
+        // GIVEN an emoji that has skin tone attached WHEN we check if it's a single emoji THEN it should return true
+        expect(isSingleEmoji('👶🏽')).toBe(true);
+        expect(isSingleEmoji('👩🏾')).toBe(true);
+        expect(isSingleEmoji('👊🏾')).toBe(true);
+
+        // GIVEN an emoji that is composite(family) with 4+ unicode pairs WHEN we check if it's a single emoji THEN it should return true
+        expect(isSingleEmoji('👨‍👩‍👦️')).toBe(true);
+        expect(isSingleEmoji('👩‍👩‍👧‍👦️')).toBe(true);
+
+        // GIVEN an emoji that has a length of 2 (flags) WHEN we check if it's a single emoji THEN it should return true
+        expect(isSingleEmoji('🇺🇲')).toBe(true);
+        expect(isSingleEmoji('🇮🇳')).toBe(true);
+        expect(isSingleEmoji('🇺🇦️')).toBe(true);
+    });
+});