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223 lines
7.3 KiB
C#
223 lines
7.3 KiB
C#
// ClassicalSharp copyright 2014-2016 UnknownShadow200 | Licensed under MIT
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//-----------------------------------------------------------------------
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// <copyright file="SimpleJson.cs" company="The Outercurve Foundation">
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// Copyright (c) 2011, The Outercurve Foundation.
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//
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// Licensed under the MIT License (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.opensource.org/licenses/mit-license.php
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// </copyright>
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// <author>Nathan Totten (ntotten.com), Jim Zimmerman (jimzimmerman.com) and Prabir Shrestha (prabir.me)</author>
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// <website>https://github.com/facebook-csharp-sdk/simple-json</website>
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//-----------------------------------------------------------------------
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// original json parsing code from http://techblog.procurios.nl/k/618/news/view/14605/14863/How-do-I-write-my-own-parser-for-JSON.html
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// This is a significantly cutdown version of the original simple-json repository.
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Text;
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namespace Launcher {
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public static class Json {
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const int TOKEN_NONE = 0, TOKEN_CURLY_OPEN = 1, TOKEN_CURLY_CLOSE = 2;
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const int TOKEN_SQUARED_OPEN = 3, TOKEN_SQUARED_CLOSE = 4, TOKEN_COLON = 5;
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const int TOKEN_COMMA = 6, TOKEN_STRING = 7, TOKEN_NUMBER = 8;
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const int TOKEN_TRUE = 9, TOKEN_FALSE = 10, TOKEN_NULL = 11;
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static Dictionary<string, object> ParseObject( string json, ref int index, ref bool success ) {
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Dictionary<string, object> table = new Dictionary<string, object>();
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NextToken( json, ref index ); // skip {
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while( true ) {
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int token = LookAhead( json, index );
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if( token == TOKEN_NONE ) {
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success = false; return null;
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} else if( token == TOKEN_COMMA ) {
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NextToken( json, ref index );
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} else if( token == 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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string name = ParseString( json, ref index, ref success );
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if( !success ) {
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success = false; return null;
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}
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token = NextToken( json, ref index );
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if( token != TOKEN_COLON ) {
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success = false; return null;
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}
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object value = ParseValue( json, ref index, ref success );
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if( !success ) {
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success = false; 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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}
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static List<object> ParseArray( string json, ref int index, ref bool success ) {
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List<object> array = new List<object>();
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NextToken( json, ref index ); // [
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while( true ) {
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int token = LookAhead( json, index );
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if( token == TOKEN_NONE ) {
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success = false; return null;
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} else if( token == TOKEN_COMMA ) {
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NextToken( json, ref index );
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} else if( token == TOKEN_SQUARED_CLOSE ) {
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NextToken( json, ref index );
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return array;
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} else {
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object value = ParseValue( json, ref index, ref success );
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if( !success ) return null;
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array.Add( value );
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}
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}
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}
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public static object ParseValue( string json, ref int index, ref bool success ) {
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switch ( LookAhead( json, index ) ) {
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case TOKEN_STRING:
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return ParseString( json, ref index, ref success );
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case TOKEN_NUMBER:
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return ParseNumber( json, ref index, ref success );
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case TOKEN_CURLY_OPEN:
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return ParseObject( json, ref index, ref success );
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case TOKEN_SQUARED_OPEN:
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return ParseArray( json, ref index, ref success );
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case TOKEN_TRUE:
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NextToken( json, ref index );
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return true;
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case TOKEN_FALSE:
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NextToken( json, ref index );
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return false;
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case TOKEN_NULL:
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NextToken( json, ref index );
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return null;
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case TOKEN_NONE:
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break;
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}
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success = false; return null;
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}
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static string ParseString( string json, ref int index, ref bool success ) {
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StringBuilder s = new StringBuilder( 400 );
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EatWhitespace( json, ref index );
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char c = json[index++]; // "
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while( true ) {
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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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return s.ToString();
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} else if( c == '\\' ) {
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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 == '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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string str = json.Substring( index, 4 );
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if( !( success = UInt32.TryParse( str, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out codePoint ) ) )
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return "";
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s.Append( new String( (char)codePoint, 1 ) );
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index += 4; // skip 4 chars
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} else {
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break;
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}
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} else {
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s.Append( '?' );
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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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success = false; return null;
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}
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const StringComparison caseless = StringComparison.OrdinalIgnoreCase;
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static object ParseNumber( string json, ref int index, ref bool success ) {
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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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string str = json.Substring( index, charLength );
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index = lastIndex + 1;
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return str;
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}
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static int GetLastIndexOfNumber( string json, int index ) {
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int lastIndex = index;
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for( ; lastIndex < json.Length; lastIndex++ ) {
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if( "0123456789+-.".IndexOf( json[lastIndex] ) == -1 )
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break;
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}
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return lastIndex - 1;
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}
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static void EatWhitespace( string json, ref int index ) {
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for( ; index < json.Length; index++ ) {
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if( " \t\n\r\b\f".IndexOf( json[index] ) == -1 )
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break;
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}
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}
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static int LookAhead( string json, int index ) {
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int saveIndex = index;
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return NextToken( json, ref saveIndex );
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}
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static int NextToken( string json, ref int index ) {
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EatWhitespace( json, ref index );
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if( index == json.Length )
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return TOKEN_NONE;
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char c = json[index];
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index++;
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if( c == '{' ) return TOKEN_CURLY_OPEN;
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if( c == '}' ) return TOKEN_CURLY_CLOSE;
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if( c == '[' ) return TOKEN_SQUARED_OPEN;
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if( c == ']' ) return TOKEN_SQUARED_CLOSE;
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if( c == ',' ) return TOKEN_COMMA;
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if( c == '"' ) return TOKEN_STRING;
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if( c == ':' ) return TOKEN_COLON;
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if( c == '-' || ('0' <= c && c <= '9') )
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return TOKEN_NUMBER;
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index--;
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if( CompareConstant( json, ref index, "false" ) )
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return TOKEN_FALSE;
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if( CompareConstant( json, ref index, "true" ) )
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return TOKEN_TRUE;
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if( CompareConstant( json, ref index, "null" ) )
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return TOKEN_NULL;
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return TOKEN_NONE;
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}
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static bool CompareConstant( string json, ref int index, string value ) {
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int remaining = json.Length - index;
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if( remaining < value.Length ) return false;
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for( int i = 0; i < value.Length; i++ ) {
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if( json[index + i] != value[i] ) return false;
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}
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index += value.Length;
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return true;
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}
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}
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} |