Remove deprecated StringBuffer.add, addAll and addCharCode.

utils/peg/pegparser.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.
 
 library Peg Parser;
 
 /*
  * The following functions are combinators for building Rules.
  *
  * A rule is one of the following
@@ skipping 582 matching lines @@
       if (compiledRule.generatesValue)
         ++valueCount;
       compiledRules.add(compiledRule);
     }
   }
   return finish(compiledRules, valueCount, reducer);
 }
 
 String _formatMultiRule(String functor, List rules) {
   var sb = new StringBuffer(functor);
-  sb.add('(');
+  sb.write('(');
   var separator = '';
   for (var rule in rules) {
-    sb.add(separator);
-    sb.add(rule);
+    sb.write(separator);
+    sb.write(rule);
     separator = ',';
   }
-  sb.add(')');
+  sb.write(')');
   return sb.toString();
 }
 
 class _SequenceRule extends _Rule {
   // This rule matches the component rules in order.
   final List<_Rule> _rules;
   final int _generatingSubRules;
   final Function _reducer;
   bool _generatesValue;
   _SequenceRule(List<_Rule> this._rules,
@@ skipping 228 matching lines @@
   add(s);
   add(t);
   add(u);
   add(v);
   add(w);
   add(x);
   add(y);
   add(z);
   return list;
 }