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