Add appengine/gcloud/mustache dependencies.

pkg/mustache/lib/char_reader.dart

+part of mustache;
+
+class _CharReader {
+
+  String _source;
+  Iterator<int> _itr;
+  int _i, _c;
+  int _line = 1, _column = 1;
+
+  _CharReader(String source)
+      : _source = source,
+        _itr = source.runes.iterator {  //FIXME runes etc. Not sure if this is the right count.
+        
+    if (source == null)
+      throw new ArgumentError('Source is null.');
+    
+    _i = 0;
+    
+    if (source == '') {
+        _c = _EOF;
+    } else {
+        _itr.moveNext();
+        _c = _itr.current;
+    }
+  }
+  
+  int get line => _line;
+  int get column => _column;
+
+  int read() {
+    var c = _c;
+    if (_itr.moveNext()) {
+        _i++;
+        _c = _itr.current;
+    } else {
+        _c = _EOF;
+    }
+
+    if (c == _NEWLINE) {
+        _line++;
+        _column = 1;
+    } else {
+        _column++;
+    }
+
+    return c;
+  }
+  
+  int peek() => _c;
+  
+  String readWhile(bool test(int charCode)) {
+    
+    if (peek() == _EOF)
+      throw new MustacheFormatException('Unexpected end of input.', line, column);
+    
+    int start = _i;
+    
+    while (peek() != _EOF && test(peek())) {
+      read();
+    }
+    
+    int end = peek() == _EOF ? _source.length : _i;
+    return _source.substring(start, end);
+  }
+}