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annotate Implab/Formats/Json/StringTranslator.cs @ 246:5aa9cfbe56c3 v3

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missing files
author cin
date Fri, 26 Jan 2018 11:19:38 +0300
parents 3e26338eb977
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 using Implab;
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2 using Implab.Formats;
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3 using System;
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4 using System.Collections.Generic;
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5 using System.Diagnostics;
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6 using System.Linq;
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7 using System.Text;
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8 using System.Threading.Tasks;
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9
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10 namespace Implab.Formats.Json {
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11 /// <summary>
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12 /// Класс для преобразования экранированной строки JSON
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13 /// </summary>
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14 static class StringTranslator {
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15 static readonly char[] _escMap;
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16 static readonly int[] _hexMap;
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17
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18 static StringTranslator() {
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19 var chars = new char[] { 'b', 'f', 't', 'r', 'n', '\\', '/', '"' };
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20 var vals = new char[] { '\b', '\f', '\t', '\r', '\n', '\\', '/', '"' };
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21
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22 _escMap = new char[chars.Max() + 1];
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23
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24 for (int i = 0; i < chars.Length; i++)
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25 _escMap[chars[i]] = vals[i];
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26
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27 var hexs = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'A', 'B', 'C', 'D', 'E', 'F' };
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28 var ints = new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 10, 11, 12, 13, 14, 15 };
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29
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30 _hexMap = new int[hexs.Max() + 1];
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31
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32 for (int i = 0; i < hexs.Length; i++)
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33 _hexMap[hexs[i]] = ints[i];
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34
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35 }
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36
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37 internal static char TranslateEscapedChar(char symbol) {
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38 return _escMap[symbol];
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39 }
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40
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41 internal static char TranslateHexUnicode(char[] symbols, int offset) {
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42 Debug.Assert(symbols != null);
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43 Debug.Assert(symbols.Length - offset >= 4);
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44
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45 int value = (_hexMap[symbols[offset]] << 12)
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46 | (_hexMap[symbols[offset + 1]] << 8)
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47 | (_hexMap[symbols[offset + 2]] << 4)
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48 | (_hexMap[symbols[offset + 3]]);
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49 return (char)value;
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50 }
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51 }
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52 }