Move frog/leg to lib/compiler/implementation.

frog/leg/lib/regexp_helper.dart

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-List regExpExec(JSSyntaxRegExp regExp, String str) {
-  var nativeRegExp = regExpGetNative(regExp);
-  var result = JS('List', @'#.exec(#)', nativeRegExp, str);
-  if (JS('bool', @'# === null', result)) return null;
-  return result; 
-}
-
-bool regExpTest(JSSyntaxRegExp regExp, String str) {
-  var nativeRegExp = regExpGetNative(regExp);
-  return JS('bool', @'#.test(#)', nativeRegExp, str);
-}
-
-regExpGetNative(JSSyntaxRegExp regExp) {
-  var r = JS('var', @'#._re', regExp);
-  if (r === null) {
-    r = JS('var', @'#._re = #', regExp, regExpMakeNative(regExp));
-  }
-  return r; 
-}
-
-regExpAttachGlobalNative(JSSyntaxRegExp regExp) {
-  JS('var', @'#._re = #', regExp, regExpMakeNative(regExp, global: true)); 
-}
-
-regExpMakeNative(JSSyntaxRegExp regExp, [bool global = false]) {
-  String pattern = regExp.pattern;
-  bool multiLine = regExp.multiLine;
-  bool ignoreCase = regExp.ignoreCase;
-  checkString(pattern);
-  StringBuffer sb = new StringBuffer();
-  if (multiLine) sb.add('m');
-  if (ignoreCase) sb.add('i');
-  if (global) sb.add('g');
-  try {
-    return JS('Object', @'new RegExp(#, #)', pattern, sb.toString());
-  } catch (var e) {
-    throw new IllegalJSRegExpException(pattern,
-                                       JS('String', @'String(#)', e));
-  }
-}
-
-int regExpMatchStart(m) => JS('int', @'#.index', m);