From cf2f200a16203311a3ac7595eb547b37fab5df82 Mon Sep 17 00:00:00 2001
From: Ganesh Viswanathan <dev@genotrance.com>
Date: Tue, 4 Dec 2018 13:24:49 -0600
Subject: Fix performance issues with regex

---
 nimterop/ast.nim     |  5 +----
 nimterop/globals.nim |  3 +++
 nimterop/grammar.nim | 10 ++++++++++
 3 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/nimterop/ast.nim b/nimterop/ast.nim
index ba7561e..df973b9 100644
--- a/nimterop/ast.nim
+++ b/nimterop/ast.nim
@@ -53,10 +53,7 @@ proc searchAstForNode(ast: ref Ast, node: TSNode): bool =
     return
 
   if ast.children.len != 0:
-    let
-      rstr = ast.getRegexForAstChildren()
-
-    if childNames.contains(rstr.toPattern):
+    if childNames.contains(ast.regex):
       if node.getTSNodeNamedChildCountSansComments() != 0:
         var flag = true
         for i in 0 .. node.tsNodeNamedChildCount()-1:
diff --git a/nimterop/globals.nim b/nimterop/globals.nim
index 39969bc..e65a4b9 100644
--- a/nimterop/globals.nim
+++ b/nimterop/globals.nim
@@ -1,5 +1,7 @@
 import tables
 
+import regex
+
 type
   Kind* = enum
     exactlyOne
@@ -12,6 +14,7 @@ type
     kind*: Kind
     children*: seq[ref Ast]
     tonim*: proc () {.closure, locks: 0.}
+    regex*: Regex
 
   State* = object
     compile*, defines*, headers*, includeDirs*, searchDirs*: seq[string]
diff --git a/nimterop/grammar.nim b/nimterop/grammar.nim
index a07ad84..7876ca3 100644
--- a/nimterop/grammar.nim
+++ b/nimterop/grammar.nim
@@ -1,5 +1,7 @@
 import strformat, tables
 
+import regex
+
 import "."/[getters, globals, lisp]
 
 proc initGrammar() =
@@ -254,6 +256,13 @@ proc initGrammar() =
 
   ))
 
+proc initRegex(ast: ref Ast) =
+  if ast.children.len != 0:
+    for child in ast.children:
+      child.initRegex()
+
+    ast.regex = ast.getRegexForAstChildren().re()
+
 proc parseGrammar*() =
   initGrammar()
 
@@ -263,6 +272,7 @@ proc parseGrammar*() =
       ast = gStateRT.grammar[i].grammar.parseLisp()
 
     ast.tonim = gStateRT.grammar[i].call
+    ast.initRegex()
     if ast.name notin gStateRT.ast:
       gStateRT.ast[ast.name] = @[ast]
     else:
-- 
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