549 lines
13 KiB
C#
549 lines
13 KiB
C#
/*
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********************************************************************************
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*Copyright(C),coolae.net
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*Author: chenbin
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*Version: 2.0
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*Date: 2017-01-09
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*Description: JSON工具
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*Others:
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*History:
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*********************************************************************************
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*/
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using System;
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using System.Collections;
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using System.Globalization;
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using System.Text;
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namespace Coolape
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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 ArrayList and Hashtable.
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/// All numbers are parsed to doubles.
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/// </summary>
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public class JSON
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{
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public const int TOKEN_NONE = 0;
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public const int TOKEN_CURLY_OPEN = 1;
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public const int TOKEN_CURLY_CLOSE = 2;
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public const int TOKEN_SQUARED_OPEN = 3;
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public const int TOKEN_SQUARED_CLOSE = 4;
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public const int TOKEN_COLON = 5;
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public const int TOKEN_COMMA = 6;
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public const int TOKEN_STRING = 7;
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public const int TOKEN_NUMBER = 8;
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public const int TOKEN_TRUE = 9;
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public const int TOKEN_FALSE = 10;
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public const int TOKEN_NULL = 11;
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private const int BUILDER_CAPACITY = 2000;
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public static Hashtable DecodeMap (string json)
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{
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object o = JsonDecode (json);
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if (o == null)
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return null;
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if (o is Hashtable) {
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return (Hashtable)o;
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}
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return null;
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}
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public static ArrayList DecodeList (string json)
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{
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object o = JsonDecode (json);
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if (o == null)
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return null;
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if (o is ArrayList) {
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return (ArrayList)o;
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}
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return null;
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}
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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 ArrayList, a Hashtable, a double, a string, null, true, or false</returns>
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public static object JsonDecode (string json)
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{
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bool success = true;
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return JsonDecode (json, ref success);
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}
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/// <summary>
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/// Parses the string json into a value; and fills 'success' with the successfullness of the parse.
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/// </summary>
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/// <param name="json">A JSON string.</param>
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/// <param name="success">Successful parse?</param>
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/// <returns>An ArrayList, a Hashtable, a double, a string, null, true, or false</returns>
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public static object JsonDecode (string json, ref bool success)
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{
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try {
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success = true;
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if (json != null) {
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char[] charArray = json.ToCharArray ();
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if (charArray == null)
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return null;
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int index = 0;
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resetIndex4JsonStr (charArray, ref index);
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object value = ParseValue (charArray, ref index, ref success);
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return value;
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} else {
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return null;
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}
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} catch (Exception e) {
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UnityEngine.Debug.LogError (e);
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return null;
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}
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}
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/// <summary>
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/// Converts a Hashtable / ArrayList object into a JSON string
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/// </summary>
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/// <param name="json">A Hashtable / ArrayList</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 JsonEncode (object json)
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{
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StringBuilder builder = new StringBuilder (BUILDER_CAPACITY);
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bool success = SerializeValue (json, builder);
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return (success ? builder.ToString () : null);
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}
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protected static Hashtable ParseObject (char[] json, ref int index, ref bool success)
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{
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Hashtable table = new Hashtable ();
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int token;
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// {
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NextToken (json, ref index);
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bool done = false;
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while (!done) {
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token = LookAhead (json, index);
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if (token == JSON.TOKEN_NONE) {
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success = false;
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return null;
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} else if (token == JSON.TOKEN_COMMA) {
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NextToken (json, ref index);
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} else if (token == JSON.TOKEN_CURLY_CLOSE) {
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NextToken (json, ref index);
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return table;
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} else {
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// name
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string name = ParseString (json, ref index, ref success);
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if (!success) {
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success = false;
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return null;
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}
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// :
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token = NextToken (json, ref index);
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if (token != JSON.TOKEN_COLON) {
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success = false;
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return null;
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}
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// value
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object value = ParseValue (json, ref index, ref success);
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if (!success) {
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success = false;
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return null;
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}
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table [name] = value;
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}
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}
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return table;
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}
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protected static ArrayList ParseArray (char[] json, ref int index, ref bool success)
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{
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ArrayList array = new ArrayList ();
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// [
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NextToken (json, ref index);
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bool done = false;
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while (!done) {
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int token = LookAhead (json, index);
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if (token == JSON.TOKEN_NONE) {
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success = false;
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return null;
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} else if (token == JSON.TOKEN_COMMA) {
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NextToken (json, ref index);
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} else if (token == JSON.TOKEN_SQUARED_CLOSE) {
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NextToken (json, ref index);
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break;
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} else {
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object value = ParseValue (json, ref index, ref success);
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if (!success) {
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return null;
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}
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array.Add (value);
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}
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}
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return array;
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}
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protected static object ParseValue (char[] json, ref int index, ref bool success)
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{
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switch (LookAhead (json, index)) {
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case JSON.TOKEN_STRING:
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return ParseString (json, ref index, ref success);
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case JSON.TOKEN_NUMBER:
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return ParseNumber (json, ref index, ref success);
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case JSON.TOKEN_CURLY_OPEN:
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return ParseObject (json, ref index, ref success);
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case JSON.TOKEN_SQUARED_OPEN:
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return ParseArray (json, ref index, ref success);
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case JSON.TOKEN_TRUE:
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NextToken (json, ref index);
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return true;
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case JSON.TOKEN_FALSE:
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NextToken (json, ref index);
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return false;
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case JSON.TOKEN_NULL:
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NextToken (json, ref index);
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return null;
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case JSON.TOKEN_NONE:
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break;
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}
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success = false;
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return null;
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}
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protected static string ParseString (char[] json, ref int index, ref bool success)
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{
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StringBuilder s = new StringBuilder (BUILDER_CAPACITY);
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char c;
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EatWhitespace (json, ref index);
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// "
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c = json [index++];
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bool complete = false;
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while (!complete) {
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if (index == json.Length) {
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break;
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}
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c = json [index++];
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if (c == '"') {
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complete = true;
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break;
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} else if (c == '\\') {
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if (index == json.Length) {
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break;
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}
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c = json [index++];
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if (c == '"') {
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s.Append ('"');
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} else if (c == '\\') {
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s.Append ('\\');
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} else if (c == '/') {
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s.Append ('/');
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} else if (c == 'b') {
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s.Append ('\b');
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} else if (c == 'f') {
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s.Append ('\f');
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} else if (c == 'n') {
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s.Append ('\n');
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} else if (c == 'r') {
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s.Append ('\r');
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} else if (c == 't') {
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s.Append ('\t');
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} else if (c == 'u') {
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int remainingLength = json.Length - index;
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if (remainingLength >= 4) {
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// parse the 32 bit hex into an integer codepoint
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uint codePoint;
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if (!(success = UInt32.TryParse (new string (json, index, 4), NumberStyles.HexNumber, CultureInfo.InvariantCulture, out codePoint))) {
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return "";
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}
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// convert the integer codepoint to a unicode char and add to string
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s.Append (Char.ConvertFromUtf32 ((int)codePoint));
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// skip 4 chars
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index += 4;
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} else {
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break;
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}
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}
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} else {
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s.Append (c);
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}
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}
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if (!complete) {
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success = false;
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return null;
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}
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return s.ToString ();
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}
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protected static double ParseNumber (char[] json, ref int index, ref bool success)
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{
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EatWhitespace (json, ref index);
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int lastIndex = GetLastIndexOfNumber (json, index);
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int charLength = (lastIndex - index) + 1;
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double number;
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success = Double.TryParse (new string (json, index, charLength), NumberStyles.Any, CultureInfo.InvariantCulture, out number);
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index = lastIndex + 1;
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return number;
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}
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protected static int GetLastIndexOfNumber (char[] json, int index)
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{
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int lastIndex;
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for (lastIndex = index; lastIndex < json.Length; lastIndex++) {
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if ("0123456789+-.eE".IndexOf (json [lastIndex]) == -1) {
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break;
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}
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}
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return lastIndex - 1;
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}
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protected static void EatWhitespace (char[] json, ref int index)
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{
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for (; index < json.Length; index++) {
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if (" \t\n\r".IndexOf (json [index]) == -1) {
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break;
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}
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}
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}
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protected static void resetIndex4JsonStr (char[] json, ref int index)
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{
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if (json == null)
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return;
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for (; index < json.Length; index++) {
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if ("[{".IndexOf (json [index]) != -1) {
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break;
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}
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}
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}
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protected static int LookAhead (char[] json, int index)
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{
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int saveIndex = index;
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return NextToken (json, ref saveIndex);
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}
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protected static int NextToken (char[] json, ref int index)
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{
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EatWhitespace (json, ref index);
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if (index == json.Length) {
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return JSON.TOKEN_NONE;
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}
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char c = json [index];
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index++;
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switch (c) {
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case '{':
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return JSON.TOKEN_CURLY_OPEN;
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case '}':
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return JSON.TOKEN_CURLY_CLOSE;
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case '[':
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return JSON.TOKEN_SQUARED_OPEN;
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case ']':
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return JSON.TOKEN_SQUARED_CLOSE;
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case ',':
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return JSON.TOKEN_COMMA;
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case '"':
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return JSON.TOKEN_STRING;
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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 JSON.TOKEN_NUMBER;
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case ':':
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return JSON.TOKEN_COLON;
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}
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index--;
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int remainingLength = json.Length - index;
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// false
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if (remainingLength >= 5) {
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if (json [index] == 'f' &&
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json [index + 1] == 'a' &&
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json [index + 2] == 'l' &&
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json [index + 3] == 's' &&
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json [index + 4] == 'e') {
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index += 5;
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return JSON.TOKEN_FALSE;
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}
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}
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// true
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if (remainingLength >= 4) {
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if (json [index] == 't' &&
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json [index + 1] == 'r' &&
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json [index + 2] == 'u' &&
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json [index + 3] == 'e') {
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index += 4;
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return JSON.TOKEN_TRUE;
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}
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}
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// null
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if (remainingLength >= 4) {
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if (json [index] == 'n' &&
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json [index + 1] == 'u' &&
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json [index + 2] == 'l' &&
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json [index + 3] == 'l') {
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index += 4;
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return JSON.TOKEN_NULL;
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}
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}
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return JSON.TOKEN_NONE;
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}
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protected static bool SerializeValue (object value, StringBuilder builder)
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{
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bool success = true;
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if (value is string) {
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success = SerializeString ((string)value, builder);
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} else if (value is Hashtable) {
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success = SerializeObject ((Hashtable)value, builder);
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} else if (value is ArrayList) {
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success = SerializeArray ((ArrayList)value, builder);
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} else if ((value is Boolean) && ((Boolean)value == true)) {
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builder.Append ("true");
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} else if ((value is Boolean) && ((Boolean)value == false)) {
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builder.Append ("false");
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} else if (value is ValueType) {
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// thanks to ritchie for pointing out ValueType to me
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success = SerializeNumber (Convert.ToDouble (value), builder);
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} else if (value == null) {
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builder.Append ("null");
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} else {
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success = false;
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}
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return success;
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}
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protected static bool SerializeObject (Hashtable anObject, StringBuilder builder)
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{
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builder.Append ("{");
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IDictionaryEnumerator e = anObject.GetEnumerator ();
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bool first = true;
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while (e.MoveNext ()) {
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string key = e.Key.ToString ();
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object value = e.Value;
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if (!first) {
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builder.Append (", ");
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}
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SerializeString (key, builder);
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builder.Append (":");
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if (!SerializeValue (value, builder)) {
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return false;
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}
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first = false;
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}
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builder.Append ("}");
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return true;
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}
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protected static bool SerializeArray (ArrayList anArray, StringBuilder builder)
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{
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builder.Append ("[");
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bool first = true;
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for (int i = 0; i < anArray.Count; i++) {
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object value = anArray [i];
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if (!first) {
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builder.Append (", ");
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}
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if (!SerializeValue (value, builder)) {
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return false;
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}
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first = false;
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}
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builder.Append ("]");
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return true;
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}
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protected static bool SerializeString (string aString, StringBuilder builder)
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{
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builder.Append ("\"");
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char[] charArray = aString.ToCharArray ();
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for (int i = 0; i < charArray.Length; i++) {
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char c = charArray [i];
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if (c == '"') {
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builder.Append ("\\\"");
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} else if (c == '\\') {
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builder.Append ("\\\\");
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} else if (c == '\b') {
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builder.Append ("\\b");
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} else if (c == '\f') {
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builder.Append ("\\f");
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} else if (c == '\n') {
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builder.Append ("\\n");
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} else if (c == '\r') {
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builder.Append ("\\r");
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} else if (c == '\t') {
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builder.Append ("\\t");
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} else {
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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" + Convert.ToString (codepoint, 16).PadLeft (4, '0'));
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}
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}
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}
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builder.Append ("\"");
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return true;
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}
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protected static bool SerializeNumber (double number, StringBuilder builder)
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{
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builder.Append (Convert.ToString (number, CultureInfo.InvariantCulture));
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return true;
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}
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}
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}
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