csharp-sdk-upm/Libs/Newtonsoft.Json.AOT/Linq/JTokenReader.cs

345 lines
11 KiB
C#

#region License
// Copyright (c) 2007 James Newton-King
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion
using System;
using LC.Newtonsoft.Json.Utilities;
namespace LC.Newtonsoft.Json.Linq
{
/// <summary>
/// Represents a reader that provides fast, non-cached, forward-only access to serialized JSON data.
/// </summary>
public class JTokenReader : JsonReader, IJsonLineInfo
{
private readonly JToken _root;
private string? _initialPath;
private JToken? _parent;
private JToken? _current;
/// <summary>
/// Gets the <see cref="JToken"/> at the reader's current position.
/// </summary>
public JToken? CurrentToken => _current;
/// <summary>
/// Initializes a new instance of the <see cref="JTokenReader"/> class.
/// </summary>
/// <param name="token">The token to read from.</param>
public JTokenReader(JToken token)
{
ValidationUtils.ArgumentNotNull(token, nameof(token));
_root = token;
}
/// <summary>
/// Initializes a new instance of the <see cref="JTokenReader"/> class.
/// </summary>
/// <param name="token">The token to read from.</param>
/// <param name="initialPath">The initial path of the token. It is prepended to the returned <see cref="Path"/>.</param>
public JTokenReader(JToken token, string initialPath)
: this(token)
{
_initialPath = initialPath;
}
/// <summary>
/// Reads the next JSON token from the underlying <see cref="JToken"/>.
/// </summary>
/// <returns>
/// <c>true</c> if the next token was read successfully; <c>false</c> if there are no more tokens to read.
/// </returns>
public override bool Read()
{
if (CurrentState != State.Start)
{
if (_current == null)
{
return false;
}
if (_current is JContainer container && _parent != container)
{
return ReadInto(container);
}
else
{
return ReadOver(_current);
}
}
// The current value could already be the root value if it is a comment
if (_current == _root)
{
return false;
}
_current = _root;
SetToken(_current);
return true;
}
private bool ReadOver(JToken t)
{
if (t == _root)
{
return ReadToEnd();
}
JToken? next = t.Next;
if ((next == null || next == t) || t == t.Parent!.Last)
{
if (t.Parent == null)
{
return ReadToEnd();
}
return SetEnd(t.Parent);
}
else
{
_current = next;
SetToken(_current);
return true;
}
}
private bool ReadToEnd()
{
_current = null;
SetToken(JsonToken.None);
return false;
}
private JsonToken? GetEndToken(JContainer c)
{
switch (c.Type)
{
case JTokenType.Object:
return JsonToken.EndObject;
case JTokenType.Array:
return JsonToken.EndArray;
case JTokenType.Constructor:
return JsonToken.EndConstructor;
case JTokenType.Property:
return null;
default:
throw MiscellaneousUtils.CreateArgumentOutOfRangeException(nameof(c.Type), c.Type, "Unexpected JContainer type.");
}
}
private bool ReadInto(JContainer c)
{
JToken? firstChild = c.First;
if (firstChild == null)
{
return SetEnd(c);
}
else
{
SetToken(firstChild);
_current = firstChild;
_parent = c;
return true;
}
}
private bool SetEnd(JContainer c)
{
JsonToken? endToken = GetEndToken(c);
if (endToken != null)
{
SetToken(endToken.GetValueOrDefault());
_current = c;
_parent = c;
return true;
}
else
{
return ReadOver(c);
}
}
private void SetToken(JToken token)
{
switch (token.Type)
{
case JTokenType.Object:
SetToken(JsonToken.StartObject);
break;
case JTokenType.Array:
SetToken(JsonToken.StartArray);
break;
case JTokenType.Constructor:
SetToken(JsonToken.StartConstructor, ((JConstructor)token).Name);
break;
case JTokenType.Property:
SetToken(JsonToken.PropertyName, ((JProperty)token).Name);
break;
case JTokenType.Comment:
SetToken(JsonToken.Comment, ((JValue)token).Value);
break;
case JTokenType.Integer:
SetToken(JsonToken.Integer, ((JValue)token).Value);
break;
case JTokenType.Float:
SetToken(JsonToken.Float, ((JValue)token).Value);
break;
case JTokenType.String:
SetToken(JsonToken.String, ((JValue)token).Value);
break;
case JTokenType.Boolean:
SetToken(JsonToken.Boolean, ((JValue)token).Value);
break;
case JTokenType.Null:
SetToken(JsonToken.Null, ((JValue)token).Value);
break;
case JTokenType.Undefined:
SetToken(JsonToken.Undefined, ((JValue)token).Value);
break;
case JTokenType.Date:
{
object? v = ((JValue)token).Value;
if (v is DateTime dt)
{
v = DateTimeUtils.EnsureDateTime(dt, DateTimeZoneHandling);
}
SetToken(JsonToken.Date, v);
break;
}
case JTokenType.Raw:
SetToken(JsonToken.Raw, ((JValue)token).Value);
break;
case JTokenType.Bytes:
SetToken(JsonToken.Bytes, ((JValue)token).Value);
break;
case JTokenType.Guid:
SetToken(JsonToken.String, SafeToString(((JValue)token).Value));
break;
case JTokenType.Uri:
{
object? v = ((JValue)token).Value;
SetToken(JsonToken.String, v is Uri uri ? uri.OriginalString : SafeToString(v));
break;
}
case JTokenType.TimeSpan:
SetToken(JsonToken.String, SafeToString(((JValue)token).Value));
break;
default:
throw MiscellaneousUtils.CreateArgumentOutOfRangeException(nameof(token.Type), token.Type, "Unexpected JTokenType.");
}
}
private string? SafeToString(object? value)
{
return value?.ToString();
}
bool IJsonLineInfo.HasLineInfo()
{
if (CurrentState == State.Start)
{
return false;
}
IJsonLineInfo? info = _current;
return (info != null && info.HasLineInfo());
}
int IJsonLineInfo.LineNumber
{
get
{
if (CurrentState == State.Start)
{
return 0;
}
IJsonLineInfo? info = _current;
if (info != null)
{
return info.LineNumber;
}
return 0;
}
}
int IJsonLineInfo.LinePosition
{
get
{
if (CurrentState == State.Start)
{
return 0;
}
IJsonLineInfo? info = _current;
if (info != null)
{
return info.LinePosition;
}
return 0;
}
}
/// <summary>
/// Gets the path of the current JSON token.
/// </summary>
public override string Path
{
get
{
string path = base.Path;
if (_initialPath == null)
{
_initialPath = _root.Path;
}
if (!StringUtils.IsNullOrEmpty(_initialPath))
{
if (StringUtils.IsNullOrEmpty(path))
{
return _initialPath;
}
if (path.StartsWith('['))
{
path = _initialPath + path;
}
else
{
path = _initialPath + "." + path;
}
}
return path;
}
}
}
}