Avoid printing the full token stream and doing line/column position calculations when extracting th…

runtime/vm/object.cc

 // 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.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
@@ skipping 6643 matching lines @@
 
 RawString* TokenStream::PrivateKey() const {
   return raw_ptr()->private_key_;
 }
 
 
 void TokenStream::SetPrivateKey(const String& value) const {
   StorePointer(&raw_ptr()->private_key_, value.raw());
 }
 
+RawString* TokenStream::GenerateSource() const {
+  return GenerateSource(0, kMaxElements);
+}
 
-RawString* TokenStream::GenerateSource() const {
-  Iterator iterator(*this, 0, Iterator::kAllTokens);
+RawString* TokenStream::GenerateSource(intptr_t start_pos,
+                                       intptr_t end_pos) const {
+  Iterator iterator(*this, start_pos, Iterator::kAllTokens);
   const ExternalTypedData& data = ExternalTypedData::Handle(GetStream());
   const GrowableObjectArray& literals =
       GrowableObjectArray::Handle(GrowableObjectArray::New(data.Length()));
   const String& private_key = String::Handle(PrivateKey());
   intptr_t private_len = private_key.Length();
 
   Token::Kind curr = iterator.CurrentTokenKind();
   Token::Kind prev = Token::kILLEGAL;
   // Handles used in the loop.
   Object& obj = Object::Handle();
   String& literal = String::Handle();
   // Current indentation level.
   int indent = 0;
 
-  while (curr != Token::kEOS) {
+  while ((curr != Token::kEOS) && (iterator.CurrentPosition() < end_pos)) {
     // Remember current values for this token.
     obj = iterator.CurrentToken();
     literal = iterator.MakeLiteralToken(obj);
     // Advance to be able to use next token kind.
     iterator.Advance();
     Token::Kind next = iterator.CurrentTokenKind();
 
     // Handle the current token.
     if (curr == Token::kSTRING) {
       bool escape_characters = false;
@@ skipping 10624 matching lines @@
   return "_MirrorReference";
 }
 
 
 void MirrorReference::PrintToJSONStream(JSONStream* stream, bool ref) const {
   Instance::PrintToJSONStream(stream, ref);
 }
 
 
 }  // namespace dart