Merge pull request #923 from jskeet/json-parsing

Implement JSON parsing in C#.

Makefile.am

@@ -82,6 +82,8 @@ csharp_EXTRA_DIST=                                                           \
   csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.csproj                \
   csharp/src/Google.Protobuf.Test/IssuesTest.cs                              \
   csharp/src/Google.Protobuf.Test/JsonFormatterTest.cs                       \
+  csharp/src/Google.Protobuf.Test/JsonParserTest.cs                          \
+  csharp/src/Google.Protobuf.Test/JsonTokenizerTest.cs                       \
   csharp/src/Google.Protobuf.Test/Properties/AppManifest.xml                 \
   csharp/src/Google.Protobuf.Test/Properties/AssemblyInfo.cs                 \
   csharp/src/Google.Protobuf.Test/Reflection/DescriptorsTest.cs              \
@@ -119,6 +121,9 @@ csharp_EXTRA_DIST=                                                           \
   csharp/src/Google.Protobuf/IMessage.cs                                     \
   csharp/src/Google.Protobuf/InvalidProtocolBufferException.cs               \
   csharp/src/Google.Protobuf/JsonFormatter.cs                                \
+  csharp/src/Google.Protobuf/JsonParser.cs                                   \
+  csharp/src/Google.Protobuf/JsonToken.cs                                    \
+  csharp/src/Google.Protobuf/JsonTokenizer.cs                                \
   csharp/src/Google.Protobuf/LimitedInputStream.cs                           \
   csharp/src/Google.Protobuf/MessageExtensions.cs                            \
   csharp/src/Google.Protobuf/MessageParser.cs                                \

csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.csproj

@@ -95,6 +95,8 @@
     <Compile Include="Collections\MapFieldTest.cs" />
     <Compile Include="Collections\RepeatedFieldTest.cs" />
     <Compile Include="JsonFormatterTest.cs" />
+    <Compile Include="JsonParserTest.cs" />
+    <Compile Include="JsonTokenizerTest.cs" />
     <Compile Include="Reflection\DescriptorsTest.cs" />
     <Compile Include="Reflection\FieldAccessTest.cs" />
     <Compile Include="SampleEnum.cs" />

csharp/src/Google.Protobuf.Test/JsonFormatterTest.cs

@@ -275,6 +275,13 @@ namespace Google.Protobuf
             AssertJson(expectedJson, JsonFormatter.Default.Format(message));
         }
 
+        [Test]
+        public void WrapperFormatting_Message()
+        {
+            Assert.AreEqual("\"\"", JsonFormatter.Default.Format(new StringValue()));
+            Assert.AreEqual("0", JsonFormatter.Default.Format(new Int32Value()));
+        }
+
         [Test]
         public void WrapperFormatting_IncludeNull()
         {
@@ -376,12 +383,12 @@ namespace Google.Protobuf
             {
                 Fields =
                 {
-                    { "a", new Value { NullValue = new NullValue() } },
-                    { "b", new Value { BoolValue = false } },
-                    { "c", new Value { NumberValue = 10.5 } },
-                    { "d", new Value { StringValue = "text" } },
-                    { "e", new Value { ListValue = new ListValue { Values = { new Value { StringValue = "t1" }, new Value { NumberValue = 5 } } } } },
-                    { "f", new Value { StructValue = new Struct { Fields = { { "nested", new Value { StringValue = "value" } } } } } }
+                    { "a", Value.ForNull() },
+                    { "b", Value.ForBool(false) },
+                    { "c", Value.ForNumber(10.5) },
+                    { "d", Value.ForString("text") },
+                    { "e", Value.ForList(Value.ForString("t1"), Value.ForNumber(5)) },
+                    { "f", Value.ForStruct(new Struct { Fields = { { "nested", Value.ForString("value") } } }) }
                 }
             };
             AssertJson("{ 'a': null, 'b': false, 'c': 10.5, 'd': 'text', 'e': [ 't1', 5 ], 'f': { 'nested': 'value' } }", message.ToString());
@@ -405,6 +412,14 @@ namespace Google.Protobuf
             AssertJson("{ 'fieldMaskField': 'user.displayName,photo' }", JsonFormatter.Default.Format(message));
         }
 
+        // SourceContext is an example of a well-known type with no special JSON handling
+        [Test]
+        public void SourceContextStandalone()
+        {
+            var message = new SourceContext { FileName = "foo.proto" };
+            AssertJson("{ 'fileName': 'foo.proto' }", JsonFormatter.Default.Format(message));
+        }
+
         /// <summary>
         /// Checks that the actual JSON is the same as the expected JSON - but after replacing
         /// all apostrophes in the expected JSON with double quotes. This basically makes the tests easier

csharp/src/Google.Protobuf/FieldCodec.cs

@@ -30,6 +30,7 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #endregion
 
+using Google.Protobuf.WellKnownTypes;
 using System;
 using System.Collections.Generic;
 
@@ -261,20 +262,17 @@ namespace Google.Protobuf
         /// </remarks>
         private static class WrapperCodecs
         {
-            // All the field numbers are the same (1).
-            private const int WrapperValueFieldNumber = Google.Protobuf.WellKnownTypes.Int32Value.ValueFieldNumber;
-
-            private static readonly Dictionary<Type, object> Codecs = new Dictionary<Type, object>
+            private static readonly Dictionary<System.Type, object> Codecs = new Dictionary<System.Type, object>
             {
-                { typeof(bool), ForBool(WireFormat.MakeTag(WrapperValueFieldNumber, WireFormat.WireType.Varint)) },
-                { typeof(int), ForInt32(WireFormat.MakeTag(WrapperValueFieldNumber, WireFormat.WireType.Varint)) },
-                { typeof(long), ForInt64(WireFormat.MakeTag(WrapperValueFieldNumber, WireFormat.WireType.Varint)) },
-                { typeof(uint), ForUInt32(WireFormat.MakeTag(WrapperValueFieldNumber, WireFormat.WireType.Varint)) },
-                { typeof(ulong), ForUInt64(WireFormat.MakeTag(WrapperValueFieldNumber, WireFormat.WireType.Varint)) },
-                { typeof(float), ForFloat(WireFormat.MakeTag(WrapperValueFieldNumber, WireFormat.WireType.Fixed32)) },
-                { typeof(double), ForDouble(WireFormat.MakeTag(WrapperValueFieldNumber, WireFormat.WireType.Fixed64)) },
-                { typeof(string), ForString(WireFormat.MakeTag(WrapperValueFieldNumber, WireFormat.WireType.LengthDelimited)) },
-                { typeof(ByteString), ForBytes(WireFormat.MakeTag(WrapperValueFieldNumber, WireFormat.WireType.LengthDelimited)) }
+                { typeof(bool), ForBool(WireFormat.MakeTag(Wrappers.WrapperValueFieldNumber, WireFormat.WireType.Varint)) },
+                { typeof(int), ForInt32(WireFormat.MakeTag(Wrappers.WrapperValueFieldNumber, WireFormat.WireType.Varint)) },
+                { typeof(long), ForInt64(WireFormat.MakeTag(Wrappers.WrapperValueFieldNumber, WireFormat.WireType.Varint)) },
+                { typeof(uint), ForUInt32(WireFormat.MakeTag(Wrappers.WrapperValueFieldNumber, WireFormat.WireType.Varint)) },
+                { typeof(ulong), ForUInt64(WireFormat.MakeTag(Wrappers.WrapperValueFieldNumber, WireFormat.WireType.Varint)) },
+                { typeof(float), ForFloat(WireFormat.MakeTag(Wrappers.WrapperValueFieldNumber, WireFormat.WireType.Fixed32)) },
+                { typeof(double), ForDouble(WireFormat.MakeTag(Wrappers.WrapperValueFieldNumber, WireFormat.WireType.Fixed64)) },
+                { typeof(string), ForString(WireFormat.MakeTag(Wrappers.WrapperValueFieldNumber, WireFormat.WireType.LengthDelimited)) },
+                { typeof(ByteString), ForBytes(WireFormat.MakeTag(Wrappers.WrapperValueFieldNumber, WireFormat.WireType.LengthDelimited)) }
             };
 
             /// <summary>

csharp/src/Google.Protobuf/Google.Protobuf.csproj

@@ -85,6 +85,9 @@
     <Compile Include="FrameworkPortability.cs" />
     <Compile Include="IDeepCloneable.cs" />
     <Compile Include="JsonFormatter.cs" />
+    <Compile Include="JsonParser.cs" />
+    <Compile Include="JsonToken.cs" />
+    <Compile Include="JsonTokenizer.cs" />
     <Compile Include="MessageExtensions.cs" />
     <Compile Include="IMessage.cs" />
     <Compile Include="InvalidProtocolBufferException.cs" />
@@ -130,7 +133,9 @@
     <Compile Include="WellKnownTypes\Timestamp.cs" />
     <Compile Include="WellKnownTypes\TimestampPartial.cs" />
     <Compile Include="WellKnownTypes\Type.cs" />
+    <Compile Include="WellKnownTypes\ValuePartial.cs" />
     <Compile Include="WellKnownTypes\Wrappers.cs" />
+    <Compile Include="WellKnownTypes\WrappersPartial.cs" />
     <Compile Include="WireFormat.cs" />
   </ItemGroup>
   <ItemGroup>

csharp/src/Google.Protobuf/JsonFormatter.cs

@@ -189,6 +189,7 @@ namespace Google.Protobuf
         }
 
         // Converted from src/google/protobuf/util/internal/utility.cc ToCamelCase
+        // TODO: Use the new field in FieldDescriptor.
         internal static string ToCamelCase(string input)
         {
             bool capitalizeNext = false;
@@ -382,10 +383,19 @@ namespace Google.Protobuf
                 WriteNull(builder);
                 return;
             }
-            // For wrapper types, the value will be the (possibly boxed) "native" value,
-            // so we can write it as if we were unconditionally writing the Value field for the wrapper type.
+            // For wrapper types, the value will either be the (possibly boxed) "native" value,
+            // or the message itself if we're formatting it at the top level (e.g. just calling ToString on the object itself).
+            // If it's the message form, we can extract the value first, which *will* be the (possibly boxed) native value,
+            // and then proceed, writing it as if we were definitely in a field. (We never need to wrap it in an extra string...
+            // WriteValue will do the right thing.)
+            // TODO: Detect this differently when we have dynamic messages.
             if (descriptor.File == Int32Value.Descriptor.File)
             {
+                if (value is IMessage)
+                {
+                    var message = (IMessage) value;
+                    value = message.Descriptor.Fields[Wrappers.WrapperValueFieldNumber].Accessor.GetValue(message);
+                }
                 WriteValue(builder, value);
                 return;
             }
@@ -750,7 +760,6 @@ namespace Google.Protobuf
 
             private readonly bool formatDefaultValues;
 
-
             /// <summary>
             /// Whether fields whose values are the default for the field type (e.g. 0 for integers)
             /// should be formatted (true) or omitted (false).

csharp/src/Google.Protobuf/JsonToken.cs

+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using System;
+
+namespace Google.Protobuf
+{
+    internal sealed class JsonToken : IEquatable<JsonToken>
+    {
+        // Tokens with no value can be reused.
+        private static readonly JsonToken _true = new JsonToken(TokenType.True);
+        private static readonly JsonToken _false = new JsonToken(TokenType.False);
+        private static readonly JsonToken _null = new JsonToken(TokenType.Null);
+        private static readonly JsonToken startObject = new JsonToken(TokenType.StartObject);
+        private static readonly JsonToken endObject = new JsonToken(TokenType.EndObject);
+        private static readonly JsonToken startArray = new JsonToken(TokenType.StartArray);
+        private static readonly JsonToken endArray = new JsonToken(TokenType.EndArray);
+        private static readonly JsonToken endDocument = new JsonToken(TokenType.EndDocument);
+
+        internal static JsonToken Null { get { return _null; } }
+        internal static JsonToken False { get { return _false; } }
+        internal static JsonToken True { get { return _true; } }
+        internal static JsonToken StartObject{ get { return startObject; } }
+        internal static JsonToken EndObject { get { return endObject; } }
+        internal static JsonToken StartArray { get { return startArray; } }
+        internal static JsonToken EndArray { get { return endArray; } }
+        internal static JsonToken EndDocument { get { return endDocument; } }
+
+        internal static JsonToken Name(string name)
+        {
+            return new JsonToken(TokenType.Name, stringValue: name);
+        }
+
+        internal static JsonToken Value(string value)
+        {
+            return new JsonToken(TokenType.StringValue, stringValue: value);
+        }
+
+        internal static JsonToken Value(double value)
+        {
+            return new JsonToken(TokenType.Number, numberValue: value);
+        }
+
+        internal enum TokenType
+        {
+            Null,
+            False,
+            True,
+            StringValue,
+            Number,
+            Name,
+            StartObject,
+            EndObject,
+            StartArray,
+            EndArray,
+            EndDocument
+        }
+
+        // A value is a string, number, array, object, null, true or false
+        // Arrays and objects have start/end
+        // A document consists of a value
+        // Objects are name/value sequences.
+
+        private readonly TokenType type;
+        private readonly string stringValue;
+        private readonly double numberValue;
+
+        internal TokenType Type { get { return type; } }
+        internal string StringValue { get { return stringValue; } }
+        internal double NumberValue { get { return numberValue; } }
+
+        private JsonToken(TokenType type, string stringValue = null, double numberValue = 0)
+        {
+            this.type = type;
+            this.stringValue = stringValue;
+            this.numberValue = numberValue;
+        }
+
+        public override bool Equals(object obj)
+        {
+            return Equals(obj as JsonToken);
+        }
+
+        public override int GetHashCode()
+        {
+            unchecked
+            {
+                int hash = 17;
+                hash = hash * 31 + (int) type;
+                hash = hash * 31 + stringValue == null ? 0 : stringValue.GetHashCode();
+                hash = hash * 31 + numberValue.GetHashCode();
+                return hash;
+            }
+        }
+
+        public override string ToString()
+        {
+            switch (type)
+            {
+                case TokenType.Null:
+                    return "null";
+                case TokenType.True:
+                    return "true";
+                case TokenType.False:
+                    return "false";
+                case TokenType.Name:
+                    return "name (" + stringValue + ")";
+                case TokenType.StringValue:
+                    return "value (" + stringValue + ")";
+                case TokenType.Number:
+                    return "number (" + numberValue + ")";
+                case TokenType.StartObject:
+                    return "start-object";
+                case TokenType.EndObject:
+                    return "end-object";
+                case TokenType.StartArray:
+                    return "start-array";
+                case TokenType.EndArray:
+                    return "end-array";
+                case TokenType.EndDocument:
+                    return "end-document";
+                default:
+                    throw new InvalidOperationException("Token is of unknown type " + type);
+            }
+        }
+
+        public bool Equals(JsonToken other)
+        {
+            if (ReferenceEquals(other, null))
+            {
+                return false;
+            }
+            // Note use of other.numberValue.Equals rather than ==, so that NaN compares appropriately.
+            return other.type == type && other.stringValue == stringValue && other.numberValue.Equals(numberValue);
+        }
+    }
+}

csharp/src/Google.Protobuf/MessageParser.cs

@@ -142,5 +142,17 @@ namespace Google.Protobuf
             message.MergeFrom(input);
             return message;
         }
+
+        /// <summary>
+        /// Parses a message from the given JSON.
+        /// </summary>
+        /// <param name="json">The JSON to parse.</param>
+        /// <returns>The parsed message.</returns>
+        public T ParseJson(string json)
+        {
+            T message = factory();
+            JsonParser.Default.Merge(message, json);
+            return message;
+        }
     }
 }

csharp/src/Google.Protobuf/Properties/AssemblyInfo.cs

@@ -46,7 +46,10 @@ using System.Security;
 [assembly: AssemblyCopyright("Copyright ©  2015")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
+
+#if !NCRUNCH
 [assembly: AllowPartiallyTrustedCallers]
+#endif
 
 #if SIGNED
 [assembly: InternalsVisibleTo("Google.Protobuf.Test, PublicKey=" +

csharp/src/Google.Protobuf/WellKnownTypes/DurationPartial.cs

@@ -47,6 +47,16 @@ namespace Google.Protobuf.WellKnownTypes
         /// </summary>
         public const int NanosecondsPerTick = 100;
 
+        /// <summary>
+        /// The maximum permitted number of seconds.
+        /// </summary>
+        public const long MaxSeconds = 315576000000L;
+
+        /// <summary>
+        /// The minimum permitted number of seconds.
+        /// </summary>
+        public const long MinSeconds = -315576000000L;
+
         /// <summary>
         /// Converts this <see cref="Duration"/> to a <see cref="TimeSpan"/>.
         /// </summary>

csharp/src/Google.Protobuf/WellKnownTypes/TimestampPartial.cs

@@ -38,6 +38,8 @@ namespace Google.Protobuf.WellKnownTypes
     {
         private static readonly DateTime UnixEpoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
         private static readonly long BclSecondsAtUnixEpoch = UnixEpoch.Ticks / TimeSpan.TicksPerSecond;
+        internal static readonly long UnixSecondsAtBclMinValue = -BclSecondsAtUnixEpoch;
+        internal static readonly long UnixSecondsAtBclMaxValue = (DateTime.MaxValue.Ticks / TimeSpan.TicksPerSecond) - BclSecondsAtUnixEpoch;
 
         /// <summary>
         /// Returns the difference between one <see cref="Timestamp"/> and another, as a <see cref="Duration"/>.

csharp/src/Google.Protobuf/WellKnownTypes/ValuePartial.cs

+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+namespace Google.Protobuf.WellKnownTypes
+{
+    public partial class Value
+    {
+        /// <summary>
+        /// Convenience method to create a Value message with a string value.
+        /// </summary>
+        /// <param name="value">Value to set for the StringValue property.</param>
+        /// <returns>A newly-created Value message with the given value.</returns>
+        public static Value ForString(string value)
+        {
+            Preconditions.CheckNotNull(value, "value");
+            return new Value { StringValue = value };
+        }
+
+        /// <summary>
+        /// Convenience method to create a Value message with a number value.
+        /// </summary>
+        /// <param name="value">Value to set for the NumberValue property.</param>
+        /// <returns>A newly-created Value message with the given value.</returns>
+        public static Value ForNumber(double value)
+        {
+            return new Value { NumberValue = value };
+        }
+
+        /// <summary>
+        /// Convenience method to create a Value message with a Boolean value.
+        /// </summary>
+        /// <param name="value">Value to set for the BoolValue property.</param>
+        /// <returns>A newly-created Value message with the given value.</returns>
+        public static Value ForBool(bool value)
+        {
+            return new Value { BoolValue = value };
+        }
+
+        /// <summary>
+        /// Convenience method to create a Value message with a null initial value.
+        /// </summary>
+        /// <returns>A newly-created Value message a null initial value.</returns>
+        public static Value ForNull()
+        {
+            return new Value { NullValue = 0 };
+        }
+
+        /// <summary>
+        /// Convenience method to create a Value message with an initial list of values.
+        /// </summary>
+        /// <remarks>The values provided are not cloned; the references are copied directly.</remarks>
+        /// <returns>A newly-created Value message an initial list value.</returns>
+        public static Value ForList(params Value[] values)
+        {
+            Preconditions.CheckNotNull(values, "values");
+            return new Value { ListValue = new ListValue { Values = { values } } };
+        }
+
+        /// <summary>
+        /// Convenience method to create a Value message with an initial struct value
+        /// </summary>
+        /// <remarks>The value provided is not cloned; the reference is copied directly.</remarks>
+        /// <returns>A newly-created Value message an initial struct value.</returns>
+        public static Value ForStruct(Struct value)
+        {
+            Preconditions.CheckNotNull(value, "value");
+            return new Value { StructValue = value };
+        }
+    }
+}

csharp/src/Google.Protobuf/WellKnownTypes/WrappersPartial.cs

+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+namespace Google.Protobuf.WellKnownTypes
+{
+    public static partial class Wrappers
+    {
+        /// <summary>
+        /// Field number for the single "value" field in all wrapper types.
+        /// </summary>
+        internal const int WrapperValueFieldNumber = Int32Value.ValueFieldNumber;
+    }
+}