Implement Double.toStringAsFixed.

runtime/lib/double.cc

 // 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.
 
 #include <math.h>
 
 #include "vm/bootstrap_natives.h"
 
 #include "vm/bigint_operations.h"
+#include "vm/double_conversion.h"
 #include "vm/exceptions.h"
 #include "vm/native_entry.h"
 #include "vm/object.h"
 
 namespace dart {
 
 DEFINE_NATIVE_ENTRY(Double_doubleFromInteger, 2) {
   ASSERT(AbstractTypeArguments::CheckedHandle(arguments->At(0)).IsNull());
   const Integer& value = Integer::CheckedHandle(arguments->At(1));
   const Double& result = Double::Handle(Double::New(value.AsDoubleValue()));
@@ skipping 157 matching lines @@
     arguments->SetReturn(Smi::Handle(Smi::New(static_cast<intptr_t>(result))));
   } else if ((Mint::kMinValue <= result) && (result <= Mint::kMaxValue)) {
     arguments->SetReturn(Mint::Handle(Mint::New(static_cast<int64_t>(result))));
   } else {
     arguments->SetReturn(
         Bigint::Handle(BigintOperations::NewFromDouble(result)));
   }
 }
 
 
+DEFINE_NATIVE_ENTRY(Double_toStringAsFixed, 2) {
+  const Double& arg = Double::CheckedHandle(arguments->At(0));
+  GET_NATIVE_ARGUMENT(Smi, fraction_digits, arguments->At(1));
+  double d = arg.value();
+  int fraction_digits_value = fraction_digits.Value();
+  String& result = String::Handle();
+  bool succeeded = DoubleToStringAsFixed(d, fraction_digits_value, result);
+  if (!succeeded) {
+    GrowableArray<const Object*> args;
+    args.Add(&String::ZoneHandle(String::New(
+        "Illegal arguments to double.toStringAsFixed")));
+    Exceptions::ThrowByType(Exceptions::kIllegalArgument, args);
+  }
+  arguments->SetReturn(result);
+}
+
+
+DEFINE_NATIVE_ENTRY(Double_toStringAsExponential, 2) {
+  UNIMPLEMENTED();
+}
+
+
+DEFINE_NATIVE_ENTRY(Double_toStringAsPrecision, 2) {
+  UNIMPLEMENTED();
+}
+
+
 DEFINE_NATIVE_ENTRY(Double_isInfinite, 1) {
   const Double& arg = Double::CheckedHandle(arguments->At(0));
   if (isinf(arg.value())) {
     arguments->SetReturn(Bool::Handle(Bool::True()));
   } else {
     arguments->SetReturn(Bool::Handle(Bool::False()));
   }
 }
 
 
@@ skipping 14 matching lines @@
     arguments->SetReturn(Bool::Handle(Bool::True()));
   } else {
     arguments->SetReturn(Bool::Handle(Bool::False()));
   }
 }
 
 // Add here only functions using/referring to old-style casts.
 
 }  // namespace dart