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#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);
}
}
}
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