add hw2

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

@@ -0,0 +1,85 @@
+import { joinerEmoji } from "../data.js";
+import { convertEmojiSequenceToUTF32 } from "../convert.js";
+import { splitEmojiSequences } from "../cleanup.js";
+import { createOptionalEmojiRegexItem, createSequenceEmojiRegexItem, createSetEmojiRegexItem, createUTF16EmojiRegexItem } from "./base.js";
+import { createRegexForNumbersSequence } from "./numbers.js";
+import { mergeSimilarItemsInSet } from "./similar.js";
+
+/**
+* Create tree
+*/
+function createEmojisTree(sequences) {
+	const root = [];
+	for (let i = 0; i < sequences.length; i++) {
+		const split = splitEmojiSequences(convertEmojiSequenceToUTF32(sequences[i]));
+		let parent = root;
+		for (let j = 0; j < split.length; j++) {
+			const regex = createRegexForNumbersSequence(split[j]);
+			let item;
+			const match = parent.find((item$1) => item$1.regex.regex === regex.regex);
+			if (!match) {
+				item = { regex };
+				parent.push(item);
+			} else item = match;
+			if (j === split.length - 1) {
+				item.end = true;
+				break;
+			}
+			parent = item.children || (item.children = []);
+		}
+	}
+	return root;
+}
+/**
+* Parse tree
+*/
+function parseEmojiTree(items) {
+	function mergeParsedChildren(items$1) {
+		const parsedItems = [];
+		const mapWithoutEnd = Object.create(null);
+		const mapWithEnd = Object.create(null);
+		for (let i = 0; i < items$1.length; i++) {
+			const item = items$1[i];
+			const children = item.children;
+			if (children) {
+				const fullItem = item;
+				const target = item.end ? mapWithEnd : mapWithoutEnd;
+				const regex = children.regex;
+				if (!target[regex]) target[regex] = [fullItem];
+				else target[regex].push(fullItem);
+			} else parsedItems.push(item.regex);
+		}
+		[mapWithEnd, mapWithoutEnd].forEach((source) => {
+			for (const regex in source) {
+				const items$2 = source[regex];
+				const firstItem = items$2[0];
+				let childSequence = [createUTF16EmojiRegexItem([joinerEmoji]), firstItem.children];
+				if (firstItem.end) childSequence = [createOptionalEmojiRegexItem(createSequenceEmojiRegexItem(childSequence))];
+				let mergedRegex;
+				if (items$2.length === 1) mergedRegex = firstItem.regex;
+				else mergedRegex = mergeSimilarItemsInSet(createSetEmojiRegexItem(items$2.map((item) => item.regex)));
+				const sequence = createSequenceEmojiRegexItem([mergedRegex, ...childSequence]);
+				parsedItems.push(sequence);
+			}
+		});
+		if (parsedItems.length === 1) return parsedItems[0];
+		const set = createSetEmojiRegexItem(parsedItems);
+		const result = mergeSimilarItemsInSet(set);
+		return result;
+	}
+	function parseItemChildren(item) {
+		const result = {
+			regex: item.regex,
+			end: !!item.end
+		};
+		const children = item.children;
+		if (!children) return result;
+		const parsedChildren = children.map(parseItemChildren);
+		result.children = mergeParsedChildren(parsedChildren);
+		return result;
+	}
+	const parsed = items.map(parseItemChildren);
+	return mergeParsedChildren(parsed);
+}
+
+export { createEmojisTree, parseEmojiTree };