550 lines
13 KiB
C#
550 lines
13 KiB
C#
/*
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* Copyright (c) 2013 Calvin Rien
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*
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* Based on the JSON parser by Patrick van Bergen
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* http://techblog.procurios.nl/k/618/news/view/14605/14863/How-do-I-write-my-own-parser-for-JSON.html
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*
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* Simplified it so that it doesn't throw exceptions
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* and can be used in Unity iPhone with maximum code stripping.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following 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 OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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using System.Globalization;
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namespace AmazonInternal.ThirdParty {
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using System.Collections.Generic;
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using System.Collections;
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using System.IO;
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using System.Text;
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using System;
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// Example usage:
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//
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// using UnityEngine;
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// using System.Collections;
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// using System.Collections.Generic;
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// using MiniJSON;
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//
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// public class MiniJSONTest : MonoBehaviour {
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// void Start () {
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// var jsonString = "{ \"array\": [1.44,2,3], " +
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// "\"object\": {\"key1\":\"value1\", \"key2\":256}, " +
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// "\"string\": \"The quick brown fox \\\"jumps\\\" over the lazy dog \", " +
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// "\"unicode\": \"\\u3041 Men\u00fa sesi\u00f3n\", " +
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// "\"int\": 65536, " +
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// "\"float\": 3.1415926, " +
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// "\"bool\": true, " +
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// "\"null\": null }";
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//
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// var dict = Json.Deserialize(jsonString) as Dictionary<string,object>;
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//
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// Debug.Log("deserialized: " + dict.GetType());
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// Debug.Log("dict['array'][0]: " + ((List<object>) dict["array"])[0]);
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// Debug.Log("dict['string']: " + (string) dict["string"]);
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// Debug.Log("dict['float']: " + (double) dict["float"]); // floats come out as doubles
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// Debug.Log("dict['int']: " + (long) dict["int"]); // ints come out as longs
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// Debug.Log("dict['unicode']: " + (string) dict["unicode"]);
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//
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// var str = Json.Serialize(dict);
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//
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// Debug.Log("serialized: " + str);
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// }
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// }
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/// <summary>
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/// This class encodes and decodes JSON strings.
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/// Spec. details, see http://www.json.org/
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///
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/// JSON uses Arrays and Objects. These correspond here to the datatypes IList and IDictionary.
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/// All numbers are parsed to doubles.
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/// </summary>
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public static class Json {
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/// <summary>
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/// Parses the string json into a value
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/// </summary>
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/// <param name="json">A JSON string.</param>
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/// <returns>An List<object>, a Dictionary<string, object>, a double, an integer,a string, null, true, or false</returns>
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public static object Deserialize (string json) {
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// save the string for debug information
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if (json == null) {
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return null;
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}
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return Parser.Parse (json);
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}
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sealed class Parser : IDisposable {
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const string WORD_BREAK = "{}[],:\"";
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public static bool IsWordBreak (char c) {
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return Char.IsWhiteSpace (c) || WORD_BREAK.IndexOf (c) != -1;
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}
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enum TOKEN {
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NONE,
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CURLY_OPEN,
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CURLY_CLOSE,
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SQUARED_OPEN,
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SQUARED_CLOSE,
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COLON,
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COMMA,
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STRING,
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NUMBER,
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TRUE,
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FALSE,
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NULL
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}
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StringReader json;
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Parser (string jsonString) {
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json = new StringReader (jsonString);
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}
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public static object Parse (string jsonString) {
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using (var instance = new Parser (jsonString)) {
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return instance.ParseValue ();
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}
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}
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public void Dispose () {
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json.Dispose ();
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json = null;
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}
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Dictionary<string, object> ParseObject () {
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Dictionary<string, object> table = new Dictionary<string, object> ();
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// ditch opening brace
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json.Read ();
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// {
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while (true) {
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switch (NextToken) {
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case TOKEN.NONE:
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return null;
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case TOKEN.COMMA:
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continue;
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case TOKEN.CURLY_CLOSE:
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return table;
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default:
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// name
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string name = ParseString ();
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if (name == null) {
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return null;
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}
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// :
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if (NextToken != TOKEN.COLON) {
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return null;
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}
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// ditch the colon
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json.Read ();
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// value
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table[name] = ParseValue ();
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break;
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}
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}
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}
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List<object> ParseArray () {
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List<object> array = new List<object> ();
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// ditch opening bracket
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json.Read ();
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// [
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var parsing = true;
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while (parsing) {
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TOKEN nextToken = NextToken;
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switch (nextToken) {
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case TOKEN.NONE:
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return null;
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case TOKEN.COMMA:
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continue;
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case TOKEN.SQUARED_CLOSE:
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parsing = false;
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break;
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default:
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object value = ParseByToken (nextToken);
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array.Add (value);
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break;
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}
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}
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return array;
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}
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object ParseValue () {
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TOKEN nextToken = NextToken;
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return ParseByToken (nextToken);
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}
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object ParseByToken (TOKEN token) {
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switch (token) {
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case TOKEN.STRING:
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return ParseString ();
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case TOKEN.NUMBER:
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return ParseNumber ();
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case TOKEN.CURLY_OPEN:
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return ParseObject ();
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case TOKEN.SQUARED_OPEN:
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return ParseArray ();
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case TOKEN.TRUE:
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return true;
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case TOKEN.FALSE:
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return false;
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case TOKEN.NULL:
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return null;
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default:
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return null;
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}
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}
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string ParseString () {
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StringBuilder s = new StringBuilder ();
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char c;
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// ditch opening quote
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json.Read ();
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bool parsing = true;
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while (parsing) {
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if (json.Peek () == -1) {
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parsing = false;
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break;
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}
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c = NextChar;
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switch (c) {
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case '"':
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parsing = false;
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break;
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case '\\':
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if (json.Peek () == -1) {
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parsing = false;
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break;
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}
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c = NextChar;
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switch (c) {
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case '"':
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case '\\':
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case '/':
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s.Append (c);
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break;
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case 'b':
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s.Append ('\b');
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break;
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case 'f':
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s.Append ('\f');
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break;
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case 'n':
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s.Append ('\n');
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break;
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case 'r':
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s.Append ('\r');
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break;
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case 't':
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s.Append ('\t');
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break;
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case 'u':
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var hex = new char[4];
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for (int i = 0; i < 4; i++) {
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hex[i] = NextChar;
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}
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s.Append ((char) Convert.ToInt32 (new string (hex), 16));
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break;
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}
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break;
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default:
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s.Append (c);
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break;
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}
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}
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return s.ToString ();
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}
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object ParseNumber () {
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string number = NextWord;
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if (number.IndexOf ('.') == -1) {
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long parsedInt;
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Int64.TryParse (number, NumberStyles.Any, CultureInfo.InvariantCulture, out parsedInt);
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return parsedInt;
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}
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double parsedDouble;
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Double.TryParse (number, NumberStyles.Any, CultureInfo.InvariantCulture, out parsedDouble);
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return parsedDouble;
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}
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void EatWhitespace () {
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while (Char.IsWhiteSpace (PeekChar)) {
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json.Read ();
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if (json.Peek () == -1) {
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break;
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}
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}
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}
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char PeekChar {
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get {
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return Convert.ToChar (json.Peek ());
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}
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}
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char NextChar {
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get {
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return Convert.ToChar (json.Read ());
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}
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}
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string NextWord {
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get {
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StringBuilder word = new StringBuilder ();
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while (!IsWordBreak (PeekChar)) {
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word.Append (NextChar);
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if (json.Peek () == -1) {
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break;
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}
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}
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return word.ToString ();
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}
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}
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TOKEN NextToken {
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get {
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EatWhitespace ();
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if (json.Peek () == -1) {
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return TOKEN.NONE;
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}
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switch (PeekChar) {
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case '{':
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return TOKEN.CURLY_OPEN;
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case '}':
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json.Read ();
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return TOKEN.CURLY_CLOSE;
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case '[':
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return TOKEN.SQUARED_OPEN;
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case ']':
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json.Read ();
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return TOKEN.SQUARED_CLOSE;
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case ',':
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json.Read ();
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return TOKEN.COMMA;
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case '"':
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return TOKEN.STRING;
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case ':':
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return TOKEN.COLON;
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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case '-':
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return TOKEN.NUMBER;
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}
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switch (NextWord) {
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case "false":
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return TOKEN.FALSE;
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case "true":
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return TOKEN.TRUE;
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case "null":
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return TOKEN.NULL;
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}
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return TOKEN.NONE;
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}
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}
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}
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/// <summary>
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/// Converts a IDictionary / IList object or a simple type (string, int, etc.) into a JSON string
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/// </summary>
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/// <param name="json">A Dictionary<string, object> / List<object></param>
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/// <returns>A JSON encoded string, or null if object 'json' is not serializable</returns>
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public static string Serialize (object obj) {
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return Serializer.Serialize (obj);
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}
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sealed class Serializer {
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StringBuilder builder;
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Serializer () {
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builder = new StringBuilder ();
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}
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public static string Serialize (object obj) {
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var instance = new Serializer ();
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instance.SerializeValue (obj);
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return instance.builder.ToString ();
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}
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void SerializeValue (object value) {
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IList asList;
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IDictionary asDict;
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string asStr;
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if (value == null) {
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builder.Append ("null");
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} else if ((asStr = value as string) != null) {
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SerializeString (asStr);
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} else if (value is bool) {
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builder.Append ((bool) value ? "true" : "false");
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} else if ((asList = value as IList) != null) {
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SerializeArray (asList);
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} else if ((asDict = value as IDictionary) != null) {
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SerializeObject (asDict);
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} else if (value is char) {
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SerializeString (new string ((char) value, 1));
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} else {
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SerializeOther (value);
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}
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}
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void SerializeObject (IDictionary obj) {
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bool first = true;
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builder.Append ('{');
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foreach (object e in obj.Keys) {
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if (!first) {
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builder.Append (',');
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}
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SerializeString (e.ToString ());
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builder.Append (':');
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SerializeValue (obj[e]);
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first = false;
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}
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builder.Append ('}');
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}
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void SerializeArray (IList anArray) {
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builder.Append ('[');
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bool first = true;
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foreach (object obj in anArray) {
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if (!first) {
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builder.Append (',');
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}
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SerializeValue (obj);
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first = false;
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}
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builder.Append (']');
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}
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void SerializeString (string str) {
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builder.Append ('\"');
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char[] charArray = str.ToCharArray ();
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foreach (var c in charArray) {
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switch (c) {
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case '"':
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builder.Append ("\\\"");
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break;
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case '\\':
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builder.Append ("\\\\");
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break;
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case '\b':
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builder.Append ("\\b");
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break;
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case '\f':
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builder.Append ("\\f");
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break;
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case '\n':
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builder.Append ("\\n");
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break;
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case '\r':
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builder.Append ("\\r");
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break;
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case '\t':
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builder.Append ("\\t");
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break;
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default:
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int codepoint = Convert.ToInt32 (c);
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if ((codepoint >= 32) && (codepoint <= 126)) {
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builder.Append (c);
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} else {
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builder.Append ("\\u");
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builder.Append (codepoint.ToString ("x4"));
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}
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break;
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}
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}
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builder.Append ('\"');
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}
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void SerializeOther (object value) {
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// NOTE: decimals lose precision during serialization.
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// They always have, I'm just letting you know.
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// Previously floats and doubles lost precision too.
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if (value is float) {
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builder.Append (((float) value).ToString ("R"));
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} else if (value is int ||
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value is uint ||
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value is long ||
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value is sbyte ||
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value is byte ||
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value is short ||
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value is ushort ||
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value is ulong) {
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builder.Append (value);
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} else if (value is double ||
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value is decimal) {
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builder.Append (Convert.ToDouble (value).ToString ("R"));
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} else {
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SerializeString (value.ToString ());
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}
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}
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}
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}
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} |