mirror of
https://github.com/Hofknecht/SystemTrayMenu.git
synced 2024-05-02 19:42:33 +12:00
480 lines
17 KiB
C#
480 lines
17 KiB
C#
// <copyright file="JsonParser.cs" company="PlaceholderCompany">
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// Copyright (c) PlaceholderCompany. All rights reserved.
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// </copyright>
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namespace SystemTrayMenu.Helper.Updater
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{
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// Copyright (c) 2018 Alex Parker
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// Copyright (c) 2018-2019 Peter Kirmeier
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// Permission is hereby granted, free of charge, to any person obtaining a copy of
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// this software and associated documentation files (the "Software"), to deal in
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// the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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// the Software, and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Reflection;
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using System.Runtime.Serialization;
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using System.Text;
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// Really simple JSON parser in ~300 lines
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// - Attempts to parse JSON files with minimal GC allocation
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// - Nice and simple "[1,2,3]".FromJson<List<int>>() API
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// - Classes and structs can be parsed too!
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// class Foo { public int Value; }
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// "{\"Value\":10}".FromJson<Foo>()
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// - Can parse JSON without type information into Dictionary<string,object> and List<object> e.g.
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// "[1,2,3]".FromJson<object>().GetType() == typeof(List<object>)
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// "{\"Value\":10}".FromJson<object>().GetType() == typeof(Dictionary<string,object>)
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// - No JIT Emit support to support AOT compilation on iOS
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// - Attempts are made to NOT throw an exception if the JSON is corrupted or invalid: returns null instead.
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// - Only public fields and property setters on classes/structs will be written to
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//
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// Limitations:
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// - No JIT Emit support to parse structures quickly
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// - Limited to parsing <2GB JSON files (due to int.MaxValue)
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// - Parsing of abstract classes or interfaces is NOT supported and will throw an exception.
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public static class JSONParser
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{
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[ThreadStatic]
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private static Stack<List<string>> splitArrayPool;
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[ThreadStatic]
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private static StringBuilder stringBuilder;
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[ThreadStatic]
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private static Dictionary<Type, Dictionary<string, FieldInfo>> fieldInfoCache;
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[ThreadStatic]
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private static Dictionary<Type, Dictionary<string, PropertyInfo>> propertyInfoCache;
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public static T FromJson<T>(this string json)
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{
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// Initialize, if needed, the ThreadStatic variables
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propertyInfoCache ??= new Dictionary<Type, Dictionary<string, PropertyInfo>>();
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fieldInfoCache ??= new Dictionary<Type, Dictionary<string, FieldInfo>>();
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stringBuilder ??= new StringBuilder();
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splitArrayPool ??= new Stack<List<string>>();
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// Remove all whitespace not within strings to make parsing simpler
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stringBuilder.Length = 0;
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for (int i = 0; i < json.Length; i++)
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{
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char c = json[i];
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if (c == '"')
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{
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i = AppendUntilStringEnd(true, i, json);
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continue;
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}
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if (char.IsWhiteSpace(c))
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{
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continue;
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}
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stringBuilder.Append(c);
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}
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// Parse the thing!
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return (T)ParseValue(typeof(T), stringBuilder.ToString());
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}
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internal static object ParseValue(Type type, string json)
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{
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if (type == typeof(string))
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{
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if (json.Length <= 2)
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{
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return string.Empty;
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}
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StringBuilder parseStringBuilder = new(json.Length);
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for (int i = 1; i < json.Length - 1; ++i)
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{
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if (json[i] == '\\' && i + 1 < json.Length - 1)
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{
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int j = "\"\\nrtbf/".IndexOf(json[i + 1]);
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if (j >= 0)
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{
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parseStringBuilder.Append("\"\\\n\r\t\b\f/"[j]);
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++i;
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continue;
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}
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if (json[i + 1] == 'u' && i + 5 < json.Length - 1)
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{
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if (uint.TryParse(json.AsSpan(i + 2, 4), System.Globalization.NumberStyles.AllowHexSpecifier, null, out uint c))
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{
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parseStringBuilder.Append((char)c);
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i += 5;
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continue;
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}
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}
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}
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parseStringBuilder.Append(json[i]);
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}
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return parseStringBuilder.ToString();
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}
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if (type.IsPrimitive)
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{
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var result = Convert.ChangeType(json, type, System.Globalization.CultureInfo.InvariantCulture);
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return result;
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}
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if (type == typeof(decimal))
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{
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decimal.TryParse(json, System.Globalization.NumberStyles.Float, System.Globalization.CultureInfo.InvariantCulture, out decimal result);
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return result;
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}
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if (json == "null")
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{
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return null;
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}
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if (type.IsEnum)
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{
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if (json[0] == '"')
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{
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json = json[1..^1];
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}
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try
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{
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return Enum.Parse(type, json, false);
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}
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catch
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{
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return 0;
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}
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}
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if (type.IsArray)
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{
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Type arrayType = type.GetElementType();
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if (json[0] != '[' || json[^1] != ']')
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{
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return null;
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}
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List<string> elems = Split(json);
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Array newArray = Array.CreateInstance(arrayType, elems.Count);
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for (int i = 0; i < elems.Count; i++)
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{
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newArray.SetValue(ParseValue(arrayType, elems[i]), i);
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}
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splitArrayPool.Push(elems);
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return newArray;
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}
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if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(List<>))
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{
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Type listType = type.GetGenericArguments()[0];
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if (json[0] != '[' || json[^1] != ']')
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{
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return null;
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}
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List<string> elems = Split(json);
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var list = (IList)type.GetConstructor(new Type[] { typeof(int) }).Invoke(new object[] { elems.Count });
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for (int i = 0; i < elems.Count; i++)
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{
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list.Add(ParseValue(listType, elems[i]));
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}
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splitArrayPool.Push(elems);
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return list;
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}
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if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Dictionary<,>))
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{
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Type keyType, valueType;
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{
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Type[] args = type.GetGenericArguments();
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keyType = args[0];
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valueType = args[1];
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}
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// Refuse to parse dictionary keys that aren't of type string
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if (keyType != typeof(string))
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{
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return null;
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}
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// Must be a valid dictionary element
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if (json[0] != '{' || json[^1] != '}')
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{
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return null;
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}
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// The list is split into key/value pairs only, this means the split must be divisible by 2 to be valid JSON
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List<string> elems = Split(json);
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if (elems.Count % 2 != 0)
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{
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return null;
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}
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var dictionary = (IDictionary)type.GetConstructor(new Type[] { typeof(int) }).Invoke(new object[] { elems.Count / 2 });
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for (int i = 0; i < elems.Count; i += 2)
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{
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if (elems[i].Length <= 2)
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{
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continue;
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}
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string keyValue = elems[i][1..^1];
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object val = ParseValue(valueType, elems[i + 1]);
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dictionary.Add(keyValue, val);
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}
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return dictionary;
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}
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if (type == typeof(object))
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{
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return ParseAnonymousValue(json);
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}
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if (json[0] == '{' && json[^1] == '}')
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{
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return ParseObject(type, json);
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}
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return null;
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}
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private static int AppendUntilStringEnd(bool appendEscapeCharacter, int startIdx, string json)
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{
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stringBuilder.Append(json[startIdx]);
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for (int i = startIdx + 1; i < json.Length; i++)
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{
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if (json[i] == '\\')
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{
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if (appendEscapeCharacter)
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{
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stringBuilder.Append(json[i]);
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}
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stringBuilder.Append(json[i + 1]);
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i++; // Skip next character as it is escaped
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}
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else if (json[i] == '"')
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{
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stringBuilder.Append(json[i]);
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return i;
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}
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else
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{
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stringBuilder.Append(json[i]);
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}
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}
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return json.Length - 1;
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}
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// Splits { <value>:<value>, <value>:<value> } and [ <value>, <value> ] into a list of <value> strings
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private static List<string> Split(string json)
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{
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List<string> splitArray = splitArrayPool.Count > 0 ? splitArrayPool.Pop() : new List<string>();
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splitArray.Clear();
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if (json.Length == 2)
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{
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return splitArray;
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}
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int parseDepth = 0;
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stringBuilder.Length = 0;
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for (int i = 1; i < json.Length - 1; i++)
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{
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switch (json[i])
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{
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case '[':
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case '{':
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parseDepth++;
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break;
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case ']':
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case '}':
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parseDepth--;
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break;
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case '"':
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i = AppendUntilStringEnd(true, i, json);
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continue;
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case ',':
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case ':':
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if (parseDepth == 0)
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{
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splitArray.Add(stringBuilder.ToString());
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stringBuilder.Length = 0;
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continue;
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}
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break;
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}
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stringBuilder.Append(json[i]);
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}
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splitArray.Add(stringBuilder.ToString());
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return splitArray;
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}
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private static object ParseAnonymousValue(string json)
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{
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if (json.Length == 0)
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{
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return null;
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}
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if (json[0] == '{' && json[^1] == '}')
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{
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List<string> elems = Split(json);
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if (elems.Count % 2 != 0)
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{
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return null;
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}
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var dict = new Dictionary<string, object>(elems.Count / 2);
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for (int i = 0; i < elems.Count; i += 2)
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{
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dict.Add(elems[i][1..^1], ParseAnonymousValue(elems[i + 1]));
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}
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return dict;
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}
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if (json[0] == '[' && json[^1] == ']')
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{
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List<string> items = Split(json);
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var finalList = new List<object>(items.Count);
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for (int i = 0; i < items.Count; i++)
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{
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finalList.Add(ParseAnonymousValue(items[i]));
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}
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return finalList;
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}
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if (json[0] == '"' && json[^1] == '"')
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{
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return ParseValue(typeof(string), json); // fix https://github.com/zanders3/json/issues/29
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}
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if (char.IsDigit(json[0]) || json[0] == '-')
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{
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if (json.Contains('.'))
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{
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double.TryParse(json, System.Globalization.NumberStyles.Float, System.Globalization.CultureInfo.InvariantCulture, out double result);
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return result;
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}
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else
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{
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_ = int.TryParse(json, out int result);
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return result;
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}
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}
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if (json == "true")
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{
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return true;
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}
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if (json == "false")
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{
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return false;
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}
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// handles json == "null" as well as invalid JSON
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return null;
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}
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private static Dictionary<string, T> CreateMemberNameDictionary<T>(T[] members)
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where T : MemberInfo
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{
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Dictionary<string, T> nameToMember = new(StringComparer.OrdinalIgnoreCase);
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for (int i = 0; i < members.Length; i++)
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{
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/*T member = members[i];
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if (member.IsDefined(typeof(IgnoreDataMemberAttribute), true))
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continue;
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string name = member.Name;
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if (member.IsDefined(typeof(DataMemberAttribute), true))
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{
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DataMemberAttribute dataMemberAttribute = (DataMemberAttribute)Attribute.GetCustomAttribute(member, typeof(DataMemberAttribute), true);
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if (!string.IsNullOrEmpty(dataMemberAttribute.Name))
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name = dataMemberAttribute.Name;
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}
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nameToMember.Add(name, member);*/
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// The above code is not working with .Net framework 2.0, so we ignore these attributes for compatibility reasons:
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nameToMember.Add(members[i].Name, members[i]);
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}
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return nameToMember;
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}
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private static object ParseObject(Type type, string json)
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{
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object instance = FormatterServices.GetUninitializedObject(type);
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// The list is split into key/value pairs only, this means the split must be divisible by 2 to be valid JSON
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List<string> elems = Split(json);
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if (elems.Count % 2 != 0)
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{
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return instance;
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}
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if (!fieldInfoCache.TryGetValue(type, out Dictionary<string, FieldInfo> nameToField))
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{
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nameToField = CreateMemberNameDictionary(type.GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.FlattenHierarchy));
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fieldInfoCache.Add(type, nameToField);
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}
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if (!propertyInfoCache.TryGetValue(type, out Dictionary<string, PropertyInfo> nameToProperty))
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{
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nameToProperty = CreateMemberNameDictionary(type.GetProperties(BindingFlags.Instance | BindingFlags.Public | BindingFlags.FlattenHierarchy));
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propertyInfoCache.Add(type, nameToProperty);
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}
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for (int i = 0; i < elems.Count; i += 2)
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{
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if (elems[i].Length <= 2)
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{
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continue;
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}
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string key = elems[i][1..^1];
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string value = elems[i + 1];
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if (nameToField.TryGetValue(key, out FieldInfo fieldInfo))
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{
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fieldInfo.SetValue(instance, ParseValue(fieldInfo.FieldType, value));
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}
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else if (nameToProperty.TryGetValue(key, out PropertyInfo propertyInfo))
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{
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propertyInfo.SetValue(instance, ParseValue(propertyInfo.PropertyType, value), null);
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}
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}
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return instance;
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}
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}
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} |