742 lines
15 KiB
C#
742 lines
15 KiB
C#
using System;
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using System.Collections;
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using System.Text;
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using System.Collections.Generic;
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/* Based on the JSON parser from
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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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* I 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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/// <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 MiniJSON
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{
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private const int TOKEN_NONE = 0;
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private const int TOKEN_CURLY_OPEN = 1;
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private const int TOKEN_CURLY_CLOSE = 2;
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private const int TOKEN_SQUARED_OPEN = 3;
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private const int TOKEN_SQUARED_CLOSE = 4;
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private const int TOKEN_COLON = 5;
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private const int TOKEN_COMMA = 6;
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private const int TOKEN_STRING = 7;
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private const int TOKEN_NUMBER = 8;
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private const int TOKEN_TRUE = 9;
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private const int TOKEN_FALSE = 10;
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private const int TOKEN_NULL = 11;
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private const int BUILDER_CAPACITY = 2000;
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/// <summary>
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/// On decoding, this value holds the position at which the parse failed (-1 = no error).
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/// </summary>
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protected static int lastErrorIndex = -1;
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protected static string lastDecode = "";
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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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// save the string for debug information
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MiniJSON.lastDecode = json;
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if( json != null )
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{
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char[] charArray = json.ToCharArray();
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int index = 0;
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bool success = true;
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object value = MiniJSON.parseValue( charArray, ref index, ref success );
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if( success )
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MiniJSON.lastErrorIndex = -1;
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else
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MiniJSON.lastErrorIndex = index;
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return value;
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}
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else
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{
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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 / Dictionary(string,string) 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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var builder = new StringBuilder( BUILDER_CAPACITY );
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var success = MiniJSON.serializeValue( json, builder );
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return ( success ? builder.ToString() : null );
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}
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/// <summary>
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/// On decoding, this function returns the position at which the parse failed (-1 = no error).
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/// </summary>
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/// <returns></returns>
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public static bool lastDecodeSuccessful()
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{
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return ( MiniJSON.lastErrorIndex == -1 );
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}
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/// <summary>
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/// On decoding, this function returns the position at which the parse failed (-1 = no error).
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/// </summary>
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/// <returns></returns>
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public static int getLastErrorIndex()
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{
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return MiniJSON.lastErrorIndex;
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}
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/// <summary>
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/// If a decoding error occurred, this function returns a piece of the JSON string
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/// at which the error took place. To ease debugging.
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/// </summary>
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/// <returns></returns>
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public static string getLastErrorSnippet()
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{
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if( MiniJSON.lastErrorIndex == -1 )
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{
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return "";
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}
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else
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{
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int startIndex = MiniJSON.lastErrorIndex - 5;
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int endIndex = MiniJSON.lastErrorIndex + 15;
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if( startIndex < 0 )
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startIndex = 0;
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if( endIndex >= MiniJSON.lastDecode.Length )
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endIndex = MiniJSON.lastDecode.Length - 1;
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return MiniJSON.lastDecode.Substring( startIndex, endIndex - startIndex + 1 );
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}
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}
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#region Parsing
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protected static Hashtable parseObject( char[] json, ref int index )
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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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{
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token = lookAhead( json, index );
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if( token == MiniJSON.TOKEN_NONE )
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{
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return null;
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}
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else if( token == MiniJSON.TOKEN_COMMA )
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{
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nextToken( json, ref index );
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}
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else if( token == MiniJSON.TOKEN_CURLY_CLOSE )
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{
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nextToken( json, ref index );
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return table;
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}
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else
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{
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// name
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string name = parseString( json, ref index );
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if( name == null )
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{
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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 != MiniJSON.TOKEN_COLON )
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return null;
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// value
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bool success = true;
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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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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 )
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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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{
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int token = lookAhead( json, index );
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if( token == MiniJSON.TOKEN_NONE )
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{
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return null;
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}
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else if( token == MiniJSON.TOKEN_COMMA )
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{
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nextToken( json, ref index );
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}
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else if( token == MiniJSON.TOKEN_SQUARED_CLOSE )
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{
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nextToken( json, ref index );
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break;
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}
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else
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{
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bool success = true;
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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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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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{
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case MiniJSON.TOKEN_STRING:
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return parseString( json, ref index );
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case MiniJSON.TOKEN_NUMBER:
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return parseNumber( json, ref index );
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case MiniJSON.TOKEN_CURLY_OPEN:
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return parseObject( json, ref index );
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case MiniJSON.TOKEN_SQUARED_OPEN:
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return parseArray( json, ref index );
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case MiniJSON.TOKEN_TRUE:
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nextToken( json, ref index );
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return Boolean.Parse( "TRUE" );
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case MiniJSON.TOKEN_FALSE:
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nextToken( json, ref index );
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return Boolean.Parse( "FALSE" );
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case MiniJSON.TOKEN_NULL:
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nextToken( json, ref index );
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return null;
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case MiniJSON.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 )
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{
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string s = "";
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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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{
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if( index == json.Length )
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break;
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c = json[index++];
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if( c == '"' )
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{
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complete = true;
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break;
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}
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else if( c == '\\' )
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{
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if( index == json.Length )
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break;
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c = json[index++];
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if( c == '"' )
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{
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s += '"';
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}
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else if( c == '\\' )
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{
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s += '\\';
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}
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else if( c == '/' )
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{
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s += '/';
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}
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else if( c == 'b' )
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{
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s += '\b';
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}
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else if( c == 'f' )
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{
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s += '\f';
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}
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else if( c == 'n' )
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{
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s += '\n';
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}
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else if( c == 'r' )
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{
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s += '\r';
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}
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else if( c == 't' )
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{
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s += '\t';
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}
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else if( c == 'u' )
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{
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int remainingLength = json.Length - index;
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if( remainingLength >= 4 )
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{
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char[] unicodeCharArray = new char[4];
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Array.Copy( json, index, unicodeCharArray, 0, 4 );
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uint codePoint = UInt32.Parse( new string( unicodeCharArray ), System.Globalization.NumberStyles.HexNumber );
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// convert the integer codepoint to a unicode char and add to string
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s += Char.ConvertFromUtf32( (int)codePoint );
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// skip 4 chars
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index += 4;
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}
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else
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{
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break;
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}
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}
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}
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else
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{
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s += c;
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}
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}
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if( !complete )
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return null;
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return s;
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}
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protected static double parseNumber( char[] json, ref int index )
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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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char[] numberCharArray = new char[charLength];
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Array.Copy( json, index, numberCharArray, 0, charLength );
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index = lastIndex + 1;
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return Double.Parse( new string( numberCharArray ) ); // , CultureInfo.InvariantCulture);
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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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{
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break;
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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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{
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break;
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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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{
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return MiniJSON.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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{
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case '{':
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return MiniJSON.TOKEN_CURLY_OPEN;
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case '}':
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return MiniJSON.TOKEN_CURLY_CLOSE;
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case '[':
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return MiniJSON.TOKEN_SQUARED_OPEN;
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case ']':
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return MiniJSON.TOKEN_SQUARED_CLOSE;
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case ',':
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return MiniJSON.TOKEN_COMMA;
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case '"':
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return MiniJSON.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 MiniJSON.TOKEN_NUMBER;
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case ':':
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return MiniJSON.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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{
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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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{
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index += 5;
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return MiniJSON.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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{
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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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{
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index += 4;
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return MiniJSON.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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{
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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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{
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index += 4;
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return MiniJSON.TOKEN_NULL;
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}
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}
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return MiniJSON.TOKEN_NONE;
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}
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#endregion
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#region Serialization
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protected static bool serializeObjectOrArray( object objectOrArray, StringBuilder builder )
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{
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if( objectOrArray is Hashtable )
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{
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return serializeObject( (Hashtable)objectOrArray, builder );
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}
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else if( objectOrArray is ArrayList )
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{
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return serializeArray( (ArrayList)objectOrArray, builder );
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}
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else
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{
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return false;
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}
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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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{
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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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{
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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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{
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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 serializeDictionary( Dictionary<string,string> dict, StringBuilder builder )
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{
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builder.Append( "{" );
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bool first = true;
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foreach( var kv in dict )
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{
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if( !first )
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builder.Append( ", " );
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serializeString( kv.Key, builder );
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builder.Append( ":" );
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serializeString( kv.Value, builder );
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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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{
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object value = anArray[i];
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if( !first )
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{
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builder.Append( ", " );
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}
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if( !serializeValue( value, builder ) )
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{
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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 serializeValue( object value, StringBuilder builder )
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{
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//Type t = value.GetType();
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//UnityEngine.XDebug.Log.l("type: " + t.ToString() + " isArray: " + t.IsArray);
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if( value == null )
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{
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builder.Append( "null" );
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}
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else if( value.GetType().IsArray )
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{
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serializeArray( new ArrayList( (ICollection)value ), builder );
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}
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else if( value is string )
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{
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serializeString( (string)value, builder );
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}
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else if( value is Char )
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{
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serializeString( Convert.ToString( (char)value ), builder );
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}
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else if( value is decimal )
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{
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serializeString( Convert.ToString( (decimal)value ), builder );
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}
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else if( value is Hashtable )
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{
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serializeObject( (Hashtable)value, builder );
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}
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else if( value is Dictionary<string,string> )
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{
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serializeDictionary( (Dictionary<string,string>)value, builder );
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}
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else if( value is ArrayList )
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{
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serializeArray( (ArrayList)value, builder );
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}
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else if( ( value is Boolean ) && ( (Boolean)value == true ) )
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{
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builder.Append( "true" );
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}
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else if( ( value is Boolean ) && ( (Boolean)value == false ) )
|
|
{
|
|
builder.Append( "false" );
|
|
}
|
|
else if( value.GetType().IsPrimitive )
|
|
{
|
|
serializeNumber( Convert.ToDouble( value ), builder );
|
|
}
|
|
else
|
|
{
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
protected static void serializeString( string aString, StringBuilder builder )
|
|
{
|
|
builder.Append( "\"" );
|
|
|
|
char[] charArray = aString.ToCharArray();
|
|
for( int i = 0; i < charArray.Length; i++ )
|
|
{
|
|
char c = charArray[i];
|
|
if( c == '"' )
|
|
{
|
|
builder.Append( "\\\"" );
|
|
}
|
|
else if( c == '\\' )
|
|
{
|
|
builder.Append( "\\\\" );
|
|
}
|
|
else if( c == '\b' )
|
|
{
|
|
builder.Append( "\\b" );
|
|
}
|
|
else if( c == '\f' )
|
|
{
|
|
builder.Append( "\\f" );
|
|
}
|
|
else if( c == '\n' )
|
|
{
|
|
builder.Append( "\\n" );
|
|
}
|
|
else if( c == '\r' )
|
|
{
|
|
builder.Append( "\\r" );
|
|
}
|
|
else if( c == '\t' )
|
|
{
|
|
builder.Append( "\\t" );
|
|
}
|
|
else
|
|
{
|
|
int codepoint = Convert.ToInt32( c );
|
|
if( ( codepoint >= 32 ) && ( codepoint <= 126 ) )
|
|
{
|
|
builder.Append( c );
|
|
}
|
|
else
|
|
{
|
|
builder.Append( "\\u" + Convert.ToString( codepoint, 16 ).PadLeft( 4, '0' ) );
|
|
}
|
|
}
|
|
}
|
|
|
|
builder.Append( "\"" );
|
|
}
|
|
|
|
|
|
protected static void serializeNumber( double number, StringBuilder builder )
|
|
{
|
|
builder.Append( Convert.ToString( number ) ); // , CultureInfo.InvariantCulture));
|
|
}
|
|
|
|
#endregion
|
|
|
|
}
|
|
|
|
|
|
|
|
#region Extension methods
|
|
|
|
public static class MiniJsonExtensions
|
|
{
|
|
public static string toJson( this Hashtable obj )
|
|
{
|
|
return MiniJSON.jsonEncode( obj );
|
|
}
|
|
|
|
|
|
public static string toJson( this Dictionary<string,string> obj )
|
|
{
|
|
return MiniJSON.jsonEncode( obj );
|
|
}
|
|
|
|
|
|
public static ArrayList arrayListFromJson( this string json )
|
|
{
|
|
return MiniJSON.jsonDecode( json ) as ArrayList;
|
|
}
|
|
|
|
|
|
public static Hashtable hashtableFromJson( this string json )
|
|
{
|
|
return MiniJSON.jsonDecode( json ) as Hashtable;
|
|
}
|
|
}
|
|
|
|
#endregion
|
|
|
|
|