Fix performance issues with regex

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:

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]

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: