From 6d8fc1e035a7249d58a10870ec657e27e1b9415e Mon Sep 17 00:00:00 2001
From: Michael Nedzelsky <Michael.Nedzelsky@jetbrains.com>
Date: Sat, 28 Mar 2015 12:03:15 +0300
Subject: [PATCH] JS: load metadata optimization in
 KotlinJavascriptMetadataUtils

---
 .../jetbrains/kotlin/utils/KotlinJavascriptMetadataUtils.kt   | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/compiler/util/src/org/jetbrains/kotlin/utils/KotlinJavascriptMetadataUtils.kt b/compiler/util/src/org/jetbrains/kotlin/utils/KotlinJavascriptMetadataUtils.kt
index 271a0e0fcd1..6c68cb00913 100644
--- a/compiler/util/src/org/jetbrains/kotlin/utils/KotlinJavascriptMetadataUtils.kt
+++ b/compiler/util/src/org/jetbrains/kotlin/utils/KotlinJavascriptMetadataUtils.kt
@@ -31,6 +31,7 @@ public object KotlinJavascriptMetadataUtils {
 
     public val JS_EXT: String = ".js"
     private val KOTLIN_JAVASCRIPT_METHOD_NAME = "kotlin_module_metadata"
+    private val KOTLIN_JAVASCRIPT_METHOD_NAME_PATTERN = "\\.kotlin_module_metadata\\(".toRegex()
     /**
      * Matches string like <name>.kotlin_module_metadata(<abi version>, <module name>, <base64 data>)
      */
@@ -68,6 +69,9 @@ public object KotlinJavascriptMetadataUtils {
     public fun loadMetadata(path: String): List<KotlinJavascriptMetadata> = loadMetadata(File(path))
 
     private fun parseMetadata(text: String, path: String, metadataList: MutableList<KotlinJavascriptMetadata>) {
+        // Check for literal pattern first in order to reduce time for large files without metadata
+        if (!KOTLIN_JAVASCRIPT_METHOD_NAME_PATTERN.matcher(text).find()) return
+
         val matcher = METADATA_PATTERN.matcher(text)
         while (matcher.find()) {
             var abiVersion = Integer.parseInt(matcher.group(1));