ICTS_2021/Unity3/Assets/Plugins/MiniJSON.cs

/*
 * Copyright (c) 2013 Calvin Rien
 *
 * Based on the JSON parser by Patrick van Bergen
 * http://techblog.procurios.nl/k/618/news/view/14605/14863/How-do-I-write-my-own-parser-for-JSON.html
 *
 * Simplified it so that it doesn't throw exceptions
 * and can be used in Unity iPhone with maximum code stripping.
 *
 * 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.
 */
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text;

namespace MiniJSON {
	// Example usage:
	//
	//  using UnityEngine;
	//  using System.Collections;
	//  using System.Collections.Generic;
	//  using MiniJSON;
	//
	//  public class MiniJSONTest : MonoBehaviour {
	//      void Start () {
	//          var jsonString = "{ \"array\": [1.44,2,3], " +
	//                          "\"object\": {\"key1\":\"value1\", \"key2\":256}, " +
	//                          "\"string\": \"The quick brown fox \\\"jumps\\\" over the lazy dog \", " +
	//                          "\"unicode\": \"\\u3041 Men\u00fa sesi\u00f3n\", " +
	//                          "\"int\": 65536, " +
	//                          "\"float\": 3.1415926, " +
	//                          "\"bool\": true, " +
	//                          "\"null\": null }";
	//
	//          var dict = Json.Deserialize(jsonString) as Dictionary<string,object>;
	//
	//          Debug.Log("deserialized: " + dict.GetType());
	//          Debug.Log("dict['array'][0]: " + ((List<object>) dict["array"])[0]);
	//          Debug.Log("dict['string']: " + (string) dict["string"]);
	//          Debug.Log("dict['float']: " + (double) dict["float"]); // floats come out as doubles
	//          Debug.Log("dict['int']: " + (long) dict["int"]); // ints come out as longs
	//          Debug.Log("dict['unicode']: " + (string) dict["unicode"]);
	//
	//          var str = Json.Serialize(dict);
	//
	//          Debug.Log("serialized: " + str);
	//      }
	//  }

	/// <summary>
	/// This class encodes and decodes JSON strings.
	/// Spec. details, see http://www.json.org/
	///
	/// JSON uses Arrays and Objects. These correspond here to the datatypes IList and IDictionary.
	/// All numbers are parsed to doubles.
	/// </summary>
	public static class Json {
		/// <summary>
		/// Parses the string json into a value
		/// </summary>
		/// <param name="json">A JSON string.</param>
		/// <returns>An List&lt;object&gt;, a Dictionary&lt;string, object&gt;, a double, an integer,a string, null, true, or false</returns>
		public static object Deserialize(string json) {
			// save the string for debug information
			if (json == null) {
				return null;
			}

			return Parser.Parse(json);
		}

		sealed class Parser : IDisposable {
			const string WORD_BREAK = "{}[],:\"";

			public static bool IsWordBreak(char c) {
				return Char.IsWhiteSpace(c) || WORD_BREAK.IndexOf(c) != -1;
			}

			enum TOKEN {
				NONE,
				CURLY_OPEN,
				CURLY_CLOSE,
				SQUARED_OPEN,
				SQUARED_CLOSE,
				COLON,
				COMMA,
				STRING,
				NUMBER,
				TRUE,
				FALSE,
				NULL
			};

			StringReader json;

			Parser(string jsonString) {
				json = new StringReader(jsonString);
			}

			public static object Parse(string jsonString) {
				using (var instance = new Parser(jsonString)) {
					return instance.ParseValue();
				}
			}

			public void Dispose() {
				json.Dispose();
				json = null;
			}

			Dictionary<string, object> ParseObject() {
				Dictionary<string, object> table = new Dictionary<string, object>();

				// ditch opening brace
				json.Read();

				// {
				while (true) {
					switch (NextToken) {
					case TOKEN.NONE:
						return null;
					case TOKEN.COMMA:
						continue;
					case TOKEN.CURLY_CLOSE:
						return table;
					default:
						// name
						string name = ParseString();
						if (name == null) {
							return null;
						}

						// :
						if (NextToken != TOKEN.COLON) {
							return null;
						}
						// ditch the colon
						json.Read();

						// value
						table[name] = ParseValue();
						break;
					}
				}
			}

			List<object> ParseArray() {
				List<object> array = new List<object>();

				// ditch opening bracket
				json.Read();

				// [
				var parsing = true;
				while (parsing) {
					TOKEN nextToken = NextToken;

					switch (nextToken) {
					case TOKEN.NONE:
						return null;
					case TOKEN.COMMA:
						continue;
					case TOKEN.SQUARED_CLOSE:
						parsing = false;
						break;
					default:
						object value = ParseByToken(nextToken);

						array.Add(value);
						break;
					}
				}

				return array;
			}

			object ParseValue() {
				TOKEN nextToken = NextToken;
				return ParseByToken(nextToken);
			}

			object ParseByToken(TOKEN token) {
				switch (token) {
				case TOKEN.STRING:
					return ParseString();
				case TOKEN.NUMBER:
					return ParseNumber();
				case TOKEN.CURLY_OPEN:
					return ParseObject();
				case TOKEN.SQUARED_OPEN:
					return ParseArray();
				case TOKEN.TRUE:
					return true;
				case TOKEN.FALSE:
					return false;
				case TOKEN.NULL:
					return null;
				default:
					return null;
				}
			}

			string ParseString() {
				StringBuilder s = new StringBuilder();
				char c;

				// ditch opening quote
				json.Read();

				bool parsing = true;
				while (parsing) {

					if (json.Peek() == -1) {
						parsing = false;
						break;
					}

					c = NextChar;
					switch (c) {
					case '"':
						parsing = false;
						break;
					case '\\':
						if (json.Peek() == -1) {
							parsing = false;
							break;
						}

						c = NextChar;
						switch (c) {
						case '"':
						case '\\':
						case '/':
							s.Append(c);
							break;
						case 'b':
							s.Append('\b');
							break;
						case 'f':
							s.Append('\f');
							break;
						case 'n':
							s.Append('\n');
							break;
						case 'r':
							s.Append('\r');
							break;
						case 't':
							s.Append('\t');
							break;
						case 'u':
							var hex = new char[4];

							for (int i=0; i< 4; i++) {
								hex[i] = NextChar;
							}

							s.Append((char) Convert.ToInt32(new string(hex), 16));
							break;
						}
						break;
					default:
						s.Append(c);
						break;
					}
				}

				return s.ToString();
			}

			object ParseNumber() {
				string number = NextWord;

				if (number.IndexOf('.') == -1) {
					long parsedInt;
					Int64.TryParse(number, out parsedInt);
					return parsedInt;
				}

				double parsedDouble;
				Double.TryParse(number, out parsedDouble);
				return parsedDouble;
			}

			void EatWhitespace() {
				while (Char.IsWhiteSpace(PeekChar)) {
					json.Read();

					if (json.Peek() == -1) {
						break;
					}
				}
			}

			char PeekChar {
				get {
					return Convert.ToChar(json.Peek());
				}
			}

			char NextChar {
				get {
					return Convert.ToChar(json.Read());
				}
			}

			string NextWord {
				get {
					StringBuilder word = new StringBuilder();

					while (!IsWordBreak(PeekChar)) {
						word.Append(NextChar);

						if (json.Peek() == -1) {
							break;
						}
					}

					return word.ToString();
				}
			}

			TOKEN NextToken {
				get {
					EatWhitespace();

					if (json.Peek() == -1) {
						return TOKEN.NONE;
					}

					switch (PeekChar) {
					case '{':
						return TOKEN.CURLY_OPEN;
					case '}':
						json.Read();
						return TOKEN.CURLY_CLOSE;
					case '[':
						return TOKEN.SQUARED_OPEN;
					case ']':
						json.Read();
						return TOKEN.SQUARED_CLOSE;
					case ',':
						json.Read();
						return TOKEN.COMMA;
					case '"':
						return TOKEN.STRING;
					case ':':
						return TOKEN.COLON;
					case '0':
					case '1':
					case '2':
					case '3':
					case '4':
					case '5':
					case '6':
					case '7':
					case '8':
					case '9':
					case '-':
						return TOKEN.NUMBER;
					}

					switch (NextWord) {
					case "false":
						return TOKEN.FALSE;
					case "true":
						return TOKEN.TRUE;
					case "null":
						return TOKEN.NULL;
					}

					return TOKEN.NONE;
				}
			}
		}

		/// <summary>
		/// Converts a IDictionary / IList object or a simple type (string, int, etc.) into a JSON string
		/// </summary>
		/// <param name="json">A Dictionary&lt;string, object&gt; / List&lt;object&gt;</param>
		/// <returns>A JSON encoded string, or null if object 'json' is not serializable</returns>
		public static string Serialize(object obj) {
			return Serializer.Serialize(obj);
		}

		sealed class Serializer {
			StringBuilder builder;

			Serializer() {
				builder = new StringBuilder();
			}

			public static string Serialize(object obj) {
				var instance = new Serializer();

				instance.SerializeValue(obj);

				return instance.builder.ToString();
			}

			void SerializeValue(object value) {
				IList asList;
				IDictionary asDict;
				string asStr;

				if (value == null) {
					builder.Append("null");
				} else if ((asStr = value as string) != null) {
					SerializeString(asStr);
				} else if (value is bool) {
					builder.Append((bool) value ? "true" : "false");
				} else if ((asList = value as IList) != null) {
					SerializeArray(asList);
				} else if ((asDict = value as IDictionary) != null) {
					SerializeObject(asDict);
				} else if (value is char) {
					SerializeString(new string((char) value, 1));
				} else {
					SerializeOther(value);
				}
			}

			void SerializeObject(IDictionary obj) {
				bool first = true;

				builder.Append('{');

				foreach (object e in obj.Keys) {
					if (!first) {
						builder.Append(',');
					}

					SerializeString(e.ToString());
					builder.Append(':');

					SerializeValue(obj[e]);

					first = false;
				}

				builder.Append('}');
			}

			void SerializeArray(IList anArray) {
				builder.Append('[');

				bool first = true;

				foreach (object obj in anArray) {
					if (!first) {
						builder.Append(',');
					}

					SerializeValue(obj);

					first = false;
				}

				builder.Append(']');
			}

			void SerializeString(string str) {
				builder.Append('\"');

				char[] charArray = str.ToCharArray();
				foreach (var c in charArray) {
					switch (c) {
					case '"':
						builder.Append("\\\"");
						break;
					case '\\':
						builder.Append("\\\\");
						break;
					case '\b':
						builder.Append("\\b");
						break;
					case '\f':
						builder.Append("\\f");
						break;
					case '\n':
						builder.Append("\\n");
						break;
					case '\r':
						builder.Append("\\r");
						break;
					case '\t':
						builder.Append("\\t");
						break;
					default:
						int codepoint = Convert.ToInt32(c);
						if ((codepoint >= 32) && (codepoint <= 126)) {
							builder.Append(c);
						} else {
							builder.Append("\\u");
							builder.Append(codepoint.ToString("x4"));
						}
						break;
					}
				}

				builder.Append('\"');
			}

			void SerializeOther(object value) {
				// NOTE: decimals lose precision during serialization.
				// They always have, I'm just letting you know.
				// Previously floats and doubles lost precision too.
				if (value is float) {
					builder.Append(((float) value).ToString("R"));
				} else if (value is int
				           || value is uint
				           || value is long
				           || value is sbyte
				           || value is byte
				           || value is short
				           || value is ushort
				           || value is ulong) {
					builder.Append(value);
				} else if (value is double
				           || value is decimal) {
					builder.Append(Convert.ToDouble(value).ToString("R"));
				} else {
					SerializeString(value.ToString());
				}
			}
		}
	}
}