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223 lines
7.1 KiB
C#
223 lines
7.1 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); // eat the [
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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) 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) break;
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if (!ParseEscaped(json, ref index, s)) break;
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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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static bool ParseEscaped(string json, ref int index, StringBuilder s) {
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char c = json[index++];
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if (c == '\\') { s.Append('\\'); return true; }
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if (c == '"') { s.Append('"'); return true; }
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if (c != 'u') { s.Append('?'); return true; }
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int remaining = json.Length - index;
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if (remaining < 4) return false;
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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 (!UInt32.TryParse(str, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out codePoint))
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return false;
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s.Append((char)codePoint);
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index += 4; // skip 4 chars
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return true;
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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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} |