add hw2

node_modules/@iconify/utils/lib/emoji/test/variations.js

@@ -0,0 +1,65 @@
+import { emojiComponents, keycapEmoji, vs16Emoji } from "../data.js";
+import { convertEmojiSequenceToUTF32 } from "../convert.js";
+import { getUnqualifiedEmojiSequence, joinEmojiSequences, splitEmojiSequences } from "../cleanup.js";
+import { getEmojiSequenceKeyword } from "../format.js";
+
+/**
+* Get qualified sequence, adding optional `FE0F` wherever it might exist
+*
+* This might result in sequence that is not actually valid, but considering
+* that `FE0F` is always treated as optional, full sequence used in regex will
+* catch both qualified and unqualified emojis, so proper sequence will get
+* caught anyway. This function just makes sure that in case if sequence does
+* have `FE0F`, it will be caught by regex too.
+*/
+function guessQualifiedEmojiSequence(sequence) {
+	const split = splitEmojiSequences(sequence).map((part) => {
+		if (part.indexOf(vs16Emoji) !== -1) return part;
+		if (part.length === 2) {
+			const lastNum = part[1];
+			if (lastNum === keycapEmoji) return [
+				part[0],
+				vs16Emoji,
+				lastNum
+			];
+			for (const key in emojiComponents) {
+				const range = emojiComponents[key];
+				if (lastNum >= range[0] && lastNum < range[1]) return [
+					part[0],
+					vs16Emoji,
+					lastNum
+				];
+			}
+		}
+		return part.length === 1 ? [part[0], vs16Emoji] : part;
+	});
+	return joinEmojiSequences(split);
+}
+/**
+* Get qualified variations for emojis
+*
+* Also converts list to UTF-32 as needed and removes duplicate items
+*/
+function getQualifiedEmojiVariation(item) {
+	const unqualifiedSequence = getUnqualifiedEmojiSequence(convertEmojiSequenceToUTF32(item.sequence));
+	const result = {
+		...item,
+		sequence: guessQualifiedEmojiSequence(unqualifiedSequence)
+	};
+	if (result.sequenceKey) result.sequenceKey = getEmojiSequenceKeyword(unqualifiedSequence);
+	return result;
+}
+/**
+* Get qualified emoji variations for set of emojis, ignoring duplicate entries
+*/
+function getQualifiedEmojiVariations(items) {
+	const results = Object.create(null);
+	for (let i = 0; i < items.length; i++) {
+		const result = getQualifiedEmojiVariation(items[i]);
+		const key = getEmojiSequenceKeyword(getUnqualifiedEmojiSequence(result.sequence));
+		if (!results[key] || results[key].sequence.length < result.sequence.length) results[key] = result;
+	}
+	return Object.values(results);
+}
+
+export { getQualifiedEmojiVariation, getQualifiedEmojiVariations, guessQualifiedEmojiSequence };