add hw2

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

@@ -0,0 +1,134 @@
+import { vs16Emoji } from "../data.js";
+import { splitUTF32Number } from "../convert.js";
+import { createOptionalEmojiRegexItem, createSequenceEmojiRegexItem, createSetEmojiRegexItem, createUTF16EmojiRegexItem } from "./base.js";
+
+/**
+* Create regex item for set of numbers
+*/
+function createEmojiRegexItemForNumbers(numbers) {
+	const utf32 = [];
+	const utf16 = [];
+	numbers.sort((a, b) => a - b);
+	let lastNumber;
+	for (let i = 0; i < numbers.length; i++) {
+		const number = numbers[i];
+		if (number === lastNumber) continue;
+		lastNumber = number;
+		const split = splitUTF32Number(number);
+		if (!split) {
+			utf16.push(number);
+			continue;
+		}
+		const [first, second] = split;
+		const item = utf32.find((item$1) => item$1.first === first);
+		if (item) {
+			item.second.push(second);
+			item.numbers.push(number);
+		} else utf32.push({
+			first,
+			second: [second],
+			numbers: [number]
+		});
+	}
+	const results = [];
+	if (utf16.length) results.push(createUTF16EmojiRegexItem(utf16));
+	if (utf32.length) {
+		const utf32Set = [];
+		for (let i = 0; i < utf32.length; i++) {
+			const item = utf32[i];
+			const secondRegex = createUTF16EmojiRegexItem(item.second);
+			const listItem = utf32Set.find((item$1) => item$1.second.regex === secondRegex.regex);
+			if (listItem) {
+				listItem.first.push(item.first);
+				listItem.numbers = [...listItem.numbers, ...item.numbers];
+			} else utf32Set.push({
+				second: secondRegex,
+				first: [item.first],
+				numbers: [...item.numbers]
+			});
+		}
+		for (let i = 0; i < utf32Set.length; i++) {
+			const item = utf32Set[i];
+			const firstRegex = createUTF16EmojiRegexItem(item.first);
+			const secondRegex = item.second;
+			results.push(createSequenceEmojiRegexItem([firstRegex, secondRegex], item.numbers));
+		}
+	}
+	return results.length === 1 ? results[0] : createSetEmojiRegexItem(results);
+}
+/**
+* Create sequence of numbers
+*/
+function createRegexForNumbersSequence(numbers, optionalVariations = true) {
+	const items = [];
+	for (let i = 0; i < numbers.length; i++) {
+		const num = numbers[i];
+		const split = splitUTF32Number(num);
+		if (!split) {
+			const item = createUTF16EmojiRegexItem([num]);
+			if (optionalVariations && num === vs16Emoji) items.push(createOptionalEmojiRegexItem(item));
+			else items.push(item);
+		} else {
+			items.push(createUTF16EmojiRegexItem([split[0]]));
+			items.push(createUTF16EmojiRegexItem([split[1]]));
+		}
+	}
+	if (items.length === 1) return items[0];
+	const result = createSequenceEmojiRegexItem(items);
+	if (numbers.length === 1 && items[0].type === "utf16") result.numbers = [...numbers];
+	return result;
+}
+/**
+* Attempt to optimise numbers in a set
+*/
+function optimiseNumbersSet(set) {
+	const mandatoryMatches = {
+		numbers: [],
+		items: []
+	};
+	const optionalMatches = {
+		numbers: [],
+		items: []
+	};
+	const filteredItems = set.sets.filter((item) => {
+		if (item.type === "optional") {
+			const parentItem = item.item;
+			if (parentItem.numbers) {
+				optionalMatches.items.push(item);
+				optionalMatches.numbers = optionalMatches.numbers.concat(parentItem.numbers);
+				return false;
+			}
+			return true;
+		}
+		if (item.numbers) {
+			mandatoryMatches.items.push(item);
+			mandatoryMatches.numbers = mandatoryMatches.numbers.concat(item.numbers);
+			return false;
+		}
+		return true;
+	});
+	if (mandatoryMatches.items.length + optionalMatches.items.length < 2) return set;
+	const optionalNumbers = new Set(optionalMatches.numbers);
+	let foundMatches = false;
+	mandatoryMatches.numbers = mandatoryMatches.numbers.filter((number) => {
+		if (optionalNumbers.has(number)) {
+			foundMatches = true;
+			return false;
+		}
+		return true;
+	});
+	if (mandatoryMatches.items.length) {
+		if (!foundMatches && mandatoryMatches.items.length === 1) filteredItems.push(mandatoryMatches.items[0]);
+		else if (mandatoryMatches.numbers.length) filteredItems.push(createEmojiRegexItemForNumbers(mandatoryMatches.numbers));
+	}
+	switch (optionalMatches.items.length) {
+		case 0: break;
+		case 1:
+			filteredItems.push(optionalMatches.items[0]);
+			break;
+		default: filteredItems.push(createOptionalEmojiRegexItem(createEmojiRegexItemForNumbers(optionalMatches.numbers)));
+	}
+	return filteredItems.length === 1 ? filteredItems[0] : createSetEmojiRegexItem(filteredItems);
+}
+
+export { createEmojiRegexItemForNumbers, createRegexForNumbersSequence, optimiseNumbersSet };