Profile selection in the context menu
This commit is contained in:
Frank Skare
415
src/Misc/JSONParser.cs
Normal file
415
src/Misc/JSONParser.cs
Normal file
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// https://github.com/zanders3/json
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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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namespace mpvnet
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{
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public static class JSONParser
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{
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[ThreadStatic] static Stack<List<string>> splitArrayPool;
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[ThreadStatic] static StringBuilder stringBuilder;
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[ThreadStatic] static Dictionary<Type, Dictionary<string, FieldInfo>> fieldInfoCache;
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[ThreadStatic] 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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if (propertyInfoCache == null)
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propertyInfoCache = new Dictionary<Type, Dictionary<string, PropertyInfo>>();
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if (fieldInfoCache == null)
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fieldInfoCache = new Dictionary<Type, Dictionary<string, FieldInfo>>();
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if (stringBuilder == null)
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stringBuilder = new StringBuilder();
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if (splitArrayPool == null)
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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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continue;
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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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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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stringBuilder.Append(json[i]);
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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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stringBuilder.Append(json[i]);
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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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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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return splitArray;
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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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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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return string.Empty;
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StringBuilder parseStringBuilder = new StringBuilder(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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uint c = 0;
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if (uint.TryParse(json.Substring(i + 2, 4), System.Globalization.NumberStyles.AllowHexSpecifier, null, out 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 result;
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decimal.TryParse(json, System.Globalization.NumberStyles.Float, System.Globalization.CultureInfo.InvariantCulture, out result);
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return result;
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}
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if (json == "null")
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return null;
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if (type.IsEnum)
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{
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if (json[0] == '"')
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json = json.Substring(1, json.Length - 2);
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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[json.Length - 1] != ']')
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return null;
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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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newArray.SetValue(ParseValue(arrayType, elems[i]), i);
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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[json.Length - 1] != ']')
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return null;
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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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list.Add(ParseValue(listType, elems[i]));
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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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return null;
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//Must be a valid dictionary element
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if (json[0] != '{' || json[json.Length - 1] != '}')
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return null;
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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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return null;
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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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continue;
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string keyValue = elems[i].Substring(1, elems[i].Length - 2);
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object val = ParseValue(valueType, elems[i + 1]);
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dictionary[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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return ParseAnonymousValue(json);
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if (json[0] == '{' && json[json.Length - 1] == '}')
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return ParseObject(type, json);
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return null;
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}
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static object ParseAnonymousValue(string json)
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{
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if (json.Length == 0)
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return null;
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if (json[0] == '{' && json[json.Length - 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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return null;
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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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dict[elems[i].Substring(1, elems[i].Length - 2)] = ParseAnonymousValue(elems[i + 1]);
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return dict;
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}
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if (json[0] == '[' && json[json.Length - 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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finalList.Add(ParseAnonymousValue(items[i]));
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return finalList;
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}
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if (json[0] == '"' && json[json.Length - 1] == '"')
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{
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string str = json.Substring(1, json.Length - 2);
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return str.Replace("\\", string.Empty);
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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 result;
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double.TryParse(json, System.Globalization.NumberStyles.Float, System.Globalization.CultureInfo.InvariantCulture, out 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 result;
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int.TryParse(json, out 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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return true;
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if (json == "false")
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return false;
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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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static Dictionary<string, T> CreateMemberNameDictionary<T>(T[] members) where T : MemberInfo
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{
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Dictionary<string, T> nameToMember = new Dictionary<string, T>(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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}
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return nameToMember;
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}
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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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return instance;
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Dictionary<string, FieldInfo> nameToField;
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Dictionary<string, PropertyInfo> nameToProperty;
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if (!fieldInfoCache.TryGetValue(type, out 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 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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continue;
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string key = elems[i].Substring(1, elems[i].Length - 2);
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string value = elems[i + 1];
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FieldInfo fieldInfo;
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PropertyInfo propertyInfo;
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if (nameToField.TryGetValue(key, out fieldInfo))
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fieldInfo.SetValue(instance, ParseValue(fieldInfo.FieldType, value));
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else if (nameToProperty.TryGetValue(key, out propertyInfo))
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propertyInfo.SetValue(instance, ParseValue(propertyInfo.PropertyType, value), null);
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}
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return instance;
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}
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}
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}
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