Move frog/leg to lib/compiler/implementation.

frog/leg/scanner/byte_array_scanner.dart

-// Copyright (c) 2011, 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.
-
-/**
- * Scanner that reads from a byte array and creates tokens that points
- * to the same array.
- */
-class ByteArrayScanner extends ArrayBasedScanner<ByteString> {
-  final List<int> bytes;
-
-  ByteArrayScanner(List<int> this.bytes) : super();
-
-  int nextByte() => byteAt(++byteOffset);
-
-  int peek() => byteAt(byteOffset + 1);
-
-  int byteAt(int index) => bytes[index];
-
-  AsciiString asciiString(int start, int offset) {
-    return AsciiString.of(bytes, start, byteOffset - start + offset);
-  }
-
-  Utf8String utf8String(int start, int offset) {
-    return Utf8String.of(bytes, start, byteOffset - start + offset + 1);
-  }
-
-  void appendByteStringToken(PrecedenceInfo info, ByteString value) {
-    tail.next = new ByteStringToken(info, value, tokenStart);
-    tail = tail.next;
-  }
-
-  // This method should be equivalent to the one in super. However,
-  // this is a *HOT* method and Dart VM performs better if it is easy
-  // to inline.
-  int advance() => bytes[++byteOffset];
-}