add hw2

node_modules/@iconify/utils/lib/icon/name.js

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+/**
+* Expression to test part of icon name.
+*
+* Used when loading icons from Iconify API due to project naming convension.
+* Ignored when using custom icon sets - convension does not apply.
+*/
+const matchIconName = /^[a-z0-9]+(-[a-z0-9]+)*$/;
+/**
+* Convert string icon name to IconifyIconName object.
+*/
+const stringToIcon = (value, validate, allowSimpleName, provider = "") => {
+	const colonSeparated = value.split(":");
+	if (value.slice(0, 1) === "@") {
+		if (colonSeparated.length < 2 || colonSeparated.length > 3) return null;
+		provider = colonSeparated.shift().slice(1);
+	}
+	if (colonSeparated.length > 3 || !colonSeparated.length) return null;
+	if (colonSeparated.length > 1) {
+		const name$1 = colonSeparated.pop();
+		const prefix = colonSeparated.pop();
+		const result = {
+			provider: colonSeparated.length > 0 ? colonSeparated[0] : provider,
+			prefix,
+			name: name$1
+		};
+		return validate && !validateIconName(result) ? null : result;
+	}
+	const name = colonSeparated[0];
+	const dashSeparated = name.split("-");
+	if (dashSeparated.length > 1) {
+		const result = {
+			provider,
+			prefix: dashSeparated.shift(),
+			name: dashSeparated.join("-")
+		};
+		return validate && !validateIconName(result) ? null : result;
+	}
+	if (allowSimpleName && provider === "") {
+		const result = {
+			provider,
+			prefix: "",
+			name
+		};
+		return validate && !validateIconName(result, allowSimpleName) ? null : result;
+	}
+	return null;
+};
+/**
+* Check if icon is valid.
+*
+* This function is not part of stringToIcon because validation is not needed for most code.
+*/
+const validateIconName = (icon, allowSimpleName) => {
+	if (!icon) return false;
+	return !!((allowSimpleName && icon.prefix === "" || !!icon.prefix) && !!icon.name);
+};
+
+export { matchIconName, stringToIcon, validateIconName };