add hw2

node_modules/@iconify/utils/lib/emoji/convert.js

@@ -0,0 +1,102 @@
+import { endUTF32Pair, minUTF32, startUTF32Pair1, startUTF32Pair2 } from "./data.js";
+
+/**
+* Convert string to number
+*/
+function getEmojiCodePoint(code) {
+	return parseInt(code, 16);
+}
+/**
+* First part of UTF-32 to UTF-16
+*/
+function utf32FirstNum(code) {
+	return (code - minUTF32 >> 10 | 0) + startUTF32Pair1;
+}
+/**
+* First part of UTF-32 to UTF-16
+*/
+function utf32SecondNum(code) {
+	return (code - minUTF32 & 1023) + startUTF32Pair2;
+}
+/**
+* Get UTF-32 as UTF-16 sequence
+*/
+function splitUTF32Number(code) {
+	if (code >= minUTF32) return [utf32FirstNum(code), utf32SecondNum(code)];
+}
+/**
+* Check if number is UTF-32 split as UTF-16
+*
+* Returns:
+* - 1 if number fits first number in sequence
+* - 2 if number fits second number in sequence
+* - false on failure
+*/
+function isUTF32SplitNumber(value) {
+	if (value >= startUTF32Pair1) {
+		if (value < startUTF32Pair2) return 1;
+		if (value < endUTF32Pair) return 2;
+	}
+	return false;
+}
+/**
+* Get UTF-16 sequence as UTF-32
+*/
+function mergeUTF32Numbers(part1, part2) {
+	if (part1 < startUTF32Pair1 || part1 >= startUTF32Pair2 || part2 < startUTF32Pair2 || part2 >= endUTF32Pair) return;
+	return (part1 - startUTF32Pair1 << 10) + (part2 - startUTF32Pair2) + minUTF32;
+}
+/**
+* Convert hexadecimal string or number to unicode
+*/
+function getEmojiUnicode(code) {
+	return String.fromCodePoint(typeof code === "number" ? code : getEmojiCodePoint(code));
+}
+/**
+* Convert sequence to UTF-16
+*/
+function convertEmojiSequenceToUTF16(numbers) {
+	const results = [];
+	for (let i = 0; i < numbers.length; i++) {
+		const code = numbers[i];
+		if (code >= minUTF32) {
+			results.push(utf32FirstNum(code));
+			results.push(utf32SecondNum(code));
+		} else results.push(code);
+	}
+	return results;
+}
+/**
+* Convert sequence to UTF-32
+*/
+function convertEmojiSequenceToUTF32(numbers, throwOnError = true) {
+	const results = [];
+	for (let i = 0; i < numbers.length; i++) {
+		const code = numbers[i];
+		if (code >= minUTF32) {
+			results.push(code);
+			continue;
+		}
+		const part = isUTF32SplitNumber(code);
+		if (!part) {
+			results.push(code);
+			continue;
+		}
+		if (part === 1 && numbers.length > i + 1) {
+			const merged = mergeUTF32Numbers(code, numbers[i + 1]);
+			if (merged) {
+				i++;
+				results.push(merged);
+				continue;
+			}
+		}
+		if (throwOnError) {
+			const nextCode = numbers[i + 1];
+			throw new Error(`Invalid UTF-16 sequence: ${code.toString(16)}-${nextCode ? nextCode.toString(16) : "undefined"}`);
+		}
+		results.push(code);
+	}
+	return results;
+}
+
+export { convertEmojiSequenceToUTF16, convertEmojiSequenceToUTF32, getEmojiCodePoint, getEmojiUnicode, isUTF32SplitNumber, mergeUTF32Numbers, splitUTF32Number };