Add method available to StringInputStream

runtime/bin/string_stream.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.
 
 // Interface for decoders decoding binary data into string data. The
 // decoder keeps track of line breaks during decoding.
 interface _StringDecoder {
   // Add more binary data to be decoded. The ownership of the buffer
   // is transfered to the decoder and the caller most not modify it any more.
   int write(List<int> buffer);
@@ skipping 93 matching lines @@
     _charCount++;
     // Check for line ends (\r, \n and \r\n).
     if (charCode == LF) {
       _recordLineBreakEnd(_charCount - 1);
     } else if (_lastCharCode == CR) {
       _recordLineBreakEnd(_charCount - 2);
     }
     _lastCharCode = charCode;
   }
 
+  int available() => _result.length - _resultOffset;
+
   void _recordLineBreakEnd(int charPos) {
     _lineBreakEnds.add(charPos);
     _lineBreaks++;
   }
 
   void _resetResult() {
     _charOffset += _result.length;
     _result = new List<int>();
     _resultOffset = 0;
   }
 
   abstract bool _processNext();
 
   _BufferList _bufferList;
   int _resultOffset = 0;
   List<int> _result;
   int _lineBreaks = 0;  // Number of line breaks in the current list.
   // The positions of the line breaks are tracked in terms of absolute
   // character positions from the begining of the decoded data.
   Queue<int> _lineBreakEnds;  // Character position of known line breaks.
   int _charOffset = 0;  // Character number of the first character in the list.
-  int _charCount = 0;  // Total number of characters decodes.
+  int _charCount = 0;  // Total number of characters decoded.
   int _lastCharCode = -1;
 
   final int LF = 10;
   final int CR = 13;
 }
 
 
 // Utility class for decoding ascii data delivered as a stream of
 // bytes.
 class _AsciiDecoder extends _StringDecoderBase {
@@ skipping 100 matching lines @@
         if (decodedLine != null &&
             decodedLine[decodedLine.length - 1] == '\r') {
           decodedLine = decodedLine.substring(0, decodedLine.length - 1);
         }
       }
     }
     _checkInstallDataHandler();
     return decodedLine;
   }
 
+  int available() => _decoder.available();
+
   String get encoding() => _encoding;
 
   bool get closed() => _inputClosed && _decoder.isEmpty();
 
   void set onData(void callback()) {
     _clientDataHandler = callback;
     _clientLineHandler = null;
     _checkInstallDataHandler();
     _checkScheduleCallback();
   }
@@ skipping 125 matching lines @@
   bool _inputClosed = false;  // Is the underlying input stream closed?
   bool _closed = false;  // Is this stream closed.
   bool _eof = false;  // Has all data been read from the decoder?
   Timer _scheduledDataCallback;
   Timer _scheduledLineCallback;
   Timer _scheduledCloseCallback;
   Function _clientDataHandler;
   Function _clientLineHandler;
   Function _clientCloseHandler;
 }