memorize request shortener results

sokra · sokra · commit 7a95b8c051b6 · 2017-11-24T17:21:03.000+01:00
diff --git a/lib/RequestShortener.js b/lib/RequestShortener.js
@@ -42,21 +42,27 @@ class RequestShortener {
 			this.buildinsAsModule = buildinsAsModule;
 			this.buildinsRegExp = createRegExpForPath(buildins);
 		}
+
+		this.cache = new Map();
 	}
 
 	shorten(request) {
 		if(!request) return request;
-		request = normalizeBackSlashDirection(request);
+		const cacheEntry = this.cache.get(request);
+		if(cacheEntry !== undefined) return cacheEntry;
+		let result = normalizeBackSlashDirection(request);
 		if(this.buildinsAsModule && this.buildinsRegExp)
-			request = request.replace(this.buildinsRegExp, "!(webpack)");
+			result = result.replace(this.buildinsRegExp, "!(webpack)");
 		if(this.currentDirectoryRegExp)
-			request = request.replace(this.currentDirectoryRegExp, "!.");
+			result = result.replace(this.currentDirectoryRegExp, "!.");
 		if(this.parentDirectoryRegExp)
-			request = request.replace(this.parentDirectoryRegExp, "!..");
+			result = result.replace(this.parentDirectoryRegExp, "!..");
 		if(!this.buildinsAsModule && this.buildinsRegExp)
-			request = request.replace(this.buildinsRegExp, "!(webpack)");
-		request = request.replace(INDEX_JS_REGEXP, "$1");
-		return request.replace(FRONT_OR_BACK_BANG_REGEXP, "");
+			result = result.replace(this.buildinsRegExp, "!(webpack)");
+		result = result.replace(INDEX_JS_REGEXP, "$1");
+		result = result.replace(FRONT_OR_BACK_BANG_REGEXP, "");
+		this.cache.set(request, result);
+		return result;
 	}
 }
 
