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Diffstat (limited to 'csharp/src/Google.Protobuf/JsonToken.cs')
-rw-r--r-- | csharp/src/Google.Protobuf/JsonToken.cs | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/csharp/src/Google.Protobuf/JsonToken.cs b/csharp/src/Google.Protobuf/JsonToken.cs new file mode 100644 index 00000000..6c0138cc --- /dev/null +++ b/csharp/src/Google.Protobuf/JsonToken.cs @@ -0,0 +1,166 @@ +#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); + } + } +} |