From 363723fc84f7b8477592e0105aeb331ec9a017af Mon Sep 17 00:00:00 2001
From: Florian Dold <florian.dold@gmail.com>
Date: Mon, 14 Aug 2017 05:01:11 +0200
Subject: node_modules

---
 node_modules/webpack/lib/util/identifier.js | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

(limited to 'node_modules/webpack/lib/util/identifier.js')

diff --git a/node_modules/webpack/lib/util/identifier.js b/node_modules/webpack/lib/util/identifier.js
index b1bcbf5df..82e5b811f 100644
--- a/node_modules/webpack/lib/util/identifier.js
+++ b/node_modules/webpack/lib/util/identifier.js
@@ -7,10 +7,32 @@ const looksLikeAbsolutePath = (maybeAbsolutePath) => {
 
 const normalizePathSeparator = (p) => p.replace(/\\/g, "/");
 
-exports.makePathsRelative = (context, identifier) => {
+const _makePathsRelative = (context, identifier) => {
 	return identifier
 		.split(/([|! ])/)
 		.map(str => looksLikeAbsolutePath(str) ?
 			normalizePathSeparator(path.relative(context, str)) : str)
 		.join("");
 };
+
+exports.makePathsRelative = (context, identifier, cache) => {
+	if(!cache) return _makePathsRelative(context, identifier);
+
+	const relativePaths = cache.relativePaths || (cache.relativePaths = new Map());
+
+	let cachedResult;
+	let contextCache = relativePaths.get(context);
+	if(typeof contextCache === "undefined") {
+		relativePaths.set(context, contextCache = new Map());
+	} else {
+		cachedResult = contextCache.get(identifier);
+	}
+
+	if(typeof cachedResult !== "undefined") {
+		return cachedResult;
+	} else {
+		const relativePath = _makePathsRelative(context, identifier);
+		contextCache.set(identifier, relativePath);
+		return relativePath;
+	}
+};
-- 
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