add hw2

node_modules/@iconify/utils/lib/emoji/regex/create.js

@@ -0,0 +1,37 @@
+import { convertEmojiSequenceToUTF32 } from "../convert.js";
+import { getSequenceFromEmojiStringOrKeyword } from "../cleanup.js";
+import { getQualifiedEmojiVariations } from "../test/variations.js";
+import { createEmojisTree, parseEmojiTree } from "./tree.js";
+
+/**
+* Create optimised regex
+*/
+function createOptimisedRegexForEmojiSequences(sequences) {
+	sequences = sequences.map((item) => convertEmojiSequenceToUTF32(item));
+	const tree = createEmojisTree(sequences);
+	const regex = parseEmojiTree(tree);
+	return regex.regex;
+}
+/**
+* Create optimised regex for emojis
+*
+* First parameter is array of emojis, entry can be either list of
+* code points or emoji sequence as a string
+*
+* Examples of acceptable strings (case insensitive):
+* 	'1F636 200D 1F32B FE0F' - space separated UTF32 sequence
+* 	'1f636-200d-1f32b-fe0f' - dash separated UTF32 sequence
+*  'd83d-de36-200d-d83c-df2b-fe0f' - dash separated UTF16 sequence
+*  '\\uD83D\\uDE36\\u200D\\uD83C\\uDF2B\\uFE0F' - UTF16 sequence escaped with '\\u'
+*
+* All examples above refer to the same emoji and will generate the same regex result
+*/
+function createOptimisedRegex(emojis) {
+	let sequences = emojis.map((item) => typeof item === "string" ? getSequenceFromEmojiStringOrKeyword(item) : item);
+	sequences = getQualifiedEmojiVariations(sequences.map((sequence) => {
+		return { sequence };
+	})).map((item) => item.sequence);
+	return createOptimisedRegexForEmojiSequences(sequences);
+}
+
+export { createOptimisedRegex, createOptimisedRegexForEmojiSequences };