added hover prefixer

1 files changed, 237 insertions, 0 deletions

diff --git a/node_modules/webpack/lib/util/compileBooleanMatcher.js b/node_modules/webpack/lib/util/compileBooleanMatcher.js
new file mode 100644
index 00000000..9474c6d8
--- /dev/null
+++ b/node_modules/webpack/lib/util/compileBooleanMatcher.js
@@ -0,0 +1,237 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+/**
+ * @param {string} str string
+ * @returns {string} quoted meta
+ */
+const quoteMeta = str => {
+	return str.replace(/[-[\]\\/{}()*+?.^$|]/g, "\\$&");
+};
+
+/**
+ * @param {string} str string
+ * @returns {string} string
+ */
+const toSimpleString = str => {
+	if (`${+str}` === str) {
+		return str;
+	}
+	return JSON.stringify(str);
+};
+
+/**
+ * @param {Record<string|number, boolean>} map value map
+ * @returns {boolean|(function(string): string)} true/false, when unconditionally true/false, or a template function to determine the value at runtime
+ */
+const compileBooleanMatcher = map => {
+	const positiveItems = Object.keys(map).filter(i => map[i]);
+	const negativeItems = Object.keys(map).filter(i => !map[i]);
+	if (positiveItems.length === 0) return false;
+	if (negativeItems.length === 0) return true;
+	return compileBooleanMatcherFromLists(positiveItems, negativeItems);
+};
+
+/**
+ * @param {string[]} positiveItems positive items
+ * @param {string[]} negativeItems negative items
+ * @returns {function(string): string} a template function to determine the value at runtime
+ */
+const compileBooleanMatcherFromLists = (positiveItems, negativeItems) => {
+	if (positiveItems.length === 0) return () => "false";
+	if (negativeItems.length === 0) return () => "true";
+	if (positiveItems.length === 1)
+		return value => `${toSimpleString(positiveItems[0])} == ${value}`;
+	if (negativeItems.length === 1)
+		return value => `${toSimpleString(negativeItems[0])} != ${value}`;
+	const positiveRegexp = itemsToRegexp(positiveItems);
+	const negativeRegexp = itemsToRegexp(negativeItems);
+	if (positiveRegexp.length <= negativeRegexp.length) {
+		return value => `/^${positiveRegexp}$/.test(${value})`;
+	} else {
+		return value => `!/^${negativeRegexp}$/.test(${value})`;
+	}
+};
+
+/**
+ * @param {Set<string>} itemsSet items set
+ * @param {(str: string) => string | false} getKey get key function
+ * @param {(str: Array<string>) => boolean} condition condition
+ * @returns {Array<Array<string>>} list of common items
+ */
+const popCommonItems = (itemsSet, getKey, condition) => {
+	/** @type {Map<string, Array<string>>} */
+	const map = new Map();
+	for (const item of itemsSet) {
+		const key = getKey(item);
+		if (key) {
+			let list = map.get(key);
+			if (list === undefined) {
+				/** @type {Array<string>} */
+				list = [];
+				map.set(key, list);
+			}
+			list.push(item);
+		}
+	}
+	/** @type {Array<Array<string>>} */
+	const result = [];
+	for (const list of map.values()) {
+		if (condition(list)) {
+			for (const item of list) {
+				itemsSet.delete(item);
+			}
+			result.push(list);
+		}
+	}
+	return result;
+};
+
+/**
+ * @param {Array<string>} items items
+ * @returns {string} common prefix
+ */
+const getCommonPrefix = items => {
+	let prefix = items[0];
+	for (let i = 1; i < items.length; i++) {
+		const item = items[i];
+		for (let p = 0; p < prefix.length; p++) {
+			if (item[p] !== prefix[p]) {
+				prefix = prefix.slice(0, p);
+				break;
+			}
+		}
+	}
+	return prefix;
+};
+
+/**
+ * @param {Array<string>} items items
+ * @returns {string} common suffix
+ */
+const getCommonSuffix = items => {
+	let suffix = items[0];
+	for (let i = 1; i < items.length; i++) {
+		const item = items[i];
+		for (let p = item.length - 1, s = suffix.length - 1; s >= 0; p--, s--) {
+			if (item[p] !== suffix[s]) {
+				suffix = suffix.slice(s + 1);
+				break;
+			}
+		}
+	}
+	return suffix;
+};
+
+/**
+ * @param {Array<string>} itemsArr array of items
+ * @returns {string} regexp
+ */
+const itemsToRegexp = itemsArr => {
+	if (itemsArr.length === 1) {
+		return quoteMeta(itemsArr[0]);
+	}
+	/** @type {Array<string>} */
+	const finishedItems = [];
+
+	// merge single char items: (a|b|c|d|ef) => ([abcd]|ef)
+	let countOfSingleCharItems = 0;
+	for (const item of itemsArr) {
+		if (item.length === 1) {
+			countOfSingleCharItems++;
+		}
+	}
+	// special case for only single char items
+	if (countOfSingleCharItems === itemsArr.length) {
+		return `[${quoteMeta(itemsArr.sort().join(""))}]`;
+	}
+	const items = new Set(itemsArr.sort());
+	if (countOfSingleCharItems > 2) {
+		let singleCharItems = "";
+		for (const item of items) {
+			if (item.length === 1) {
+				singleCharItems += item;
+				items.delete(item);
+			}
+		}
+		finishedItems.push(`[${quoteMeta(singleCharItems)}]`);
+	}
+
+	// special case for 2 items with common prefix/suffix
+	if (finishedItems.length === 0 && items.size === 2) {
+		const prefix = getCommonPrefix(itemsArr);
+		const suffix = getCommonSuffix(
+			itemsArr.map(item => item.slice(prefix.length))
+		);
+		if (prefix.length > 0 || suffix.length > 0) {
+			return `${quoteMeta(prefix)}${itemsToRegexp(
+				itemsArr.map(i => i.slice(prefix.length, -suffix.length || undefined))
+			)}${quoteMeta(suffix)}`;
+		}
+	}
+
+	// special case for 2 items with common suffix
+	if (finishedItems.length === 0 && items.size === 2) {
+		/** @type {Iterator<string>} */
+		const it = items[Symbol.iterator]();
+		const a = it.next().value;
+		const b = it.next().value;
+		if (a.length > 0 && b.length > 0 && a.slice(-1) === b.slice(-1)) {
+			return `${itemsToRegexp([a.slice(0, -1), b.slice(0, -1)])}${quoteMeta(
+				a.slice(-1)
+			)}`;
+		}
+	}
+
+	// find common prefix: (a1|a2|a3|a4|b5) => (a(1|2|3|4)|b5)
+	const prefixed = popCommonItems(
+		items,
+		item => (item.length >= 1 ? item[0] : false),
+		list => {
+			if (list.length >= 3) return true;
+			if (list.length <= 1) return false;
+			return list[0][1] === list[1][1];
+		}
+	);
+	for (const prefixedItems of prefixed) {
+		const prefix = getCommonPrefix(prefixedItems);
+		finishedItems.push(
+			`${quoteMeta(prefix)}${itemsToRegexp(
+				prefixedItems.map(i => i.slice(prefix.length))
+			)}`
+		);
+	}
+
+	// find common suffix: (a1|b1|c1|d1|e2) => ((a|b|c|d)1|e2)
+	const suffixed = popCommonItems(
+		items,
+		item => (item.length >= 1 ? item.slice(-1) : false),
+		list => {
+			if (list.length >= 3) return true;
+			if (list.length <= 1) return false;
+			return list[0].slice(-2) === list[1].slice(-2);
+		}
+	);
+	for (const suffixedItems of suffixed) {
+		const suffix = getCommonSuffix(suffixedItems);
+		finishedItems.push(
+			`${itemsToRegexp(
+				suffixedItems.map(i => i.slice(0, -suffix.length))
+			)}${quoteMeta(suffix)}`
+		);
+	}
+
+	// TODO further optimize regexp, i. e.
+	// use ranges: (1|2|3|4|a) => [1-4a]
+	const conditional = finishedItems.concat(Array.from(items, quoteMeta));
+	if (conditional.length === 1) return conditional[0];
+	return `(${conditional.join("|")})`;
+};
+
+compileBooleanMatcher.fromLists = compileBooleanMatcherFromLists;
+compileBooleanMatcher.itemsToRegexp = itemsToRegexp;
+module.exports = compileBooleanMatcher;