From f76108fdfdc9ebd7ca496790e08a37e3fb1a2b2c Mon Sep 17 00:00:00 2001
From: Kevin Sawicki & Nathan Sobo <kevin+nathan@github.com>
Date: Mon, 19 Aug 2013 18:04:26 -0700
Subject: [PATCH] :racehorse: Cache tab whitespace regexes in Token

---
 src/app/token.coffee | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/app/token.coffee b/src/app/token.coffee
index 0d011ffc4..3f7f3b835 100644
--- a/src/app/token.coffee
+++ b/src/app/token.coffee
@@ -1,6 +1,8 @@
 _ = require 'underscore'
 textUtils = require 'text-utils'
 
+whitespaceRegexesByTabLength = {}
+
 module.exports =
 class Token
   value: null
@@ -29,6 +31,9 @@ class Token
     value2 = @value.substring(splitIndex)
     [new Token(value: value1, scopes: @scopes), new Token(value: value2, scopes: @scopes)]
 
+  whitespaceRegexForTabLength: (tabLength) ->
+    whitespaceRegexesByTabLength[tabLength] ?= new RegExp("([ ]{#{tabLength}})|(\t)|([^\t]+)", "g")
+
   breakOutAtomicTokens: (tabLength, breakOutLeadingWhitespace) ->
     if @hasSurrogatePair
       outputTokens = []
@@ -48,8 +53,7 @@ class Token
         return [this] unless /\t/.test(@value)
 
       outputTokens = []
-      regex = new RegExp("([ ]{#{tabLength}})|(\t)|([^\t]+)", "g")
-
+      regex = @whitespaceRegexForTabLength(tabLength)
       while match = regex.exec(@value)
         [fullMatch, softTab, hardTab] = match
         if softTab and breakOutLeadingWhitespace