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163
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1 using Implab;
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2 using Implab.Parsing;
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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.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 public class StringTranslator : Scanner {
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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 public StringTranslator()
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38 : base(JSONGrammar.Instance.JsonStringDFA.States, JSONGrammar.Instance.JsonStringDFA.Alphabet.GetTranslationMap()) {
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39 }
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40
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41 public string Translate(string data) {
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42 Safe.ArgumentNotNull(data, "data");
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43 return Translate(data.ToCharArray());
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44 }
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45
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46 public string Translate(char[] data) {
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47 Safe.ArgumentNotNull(data, "data");
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48 return Translate(data, data.Length);
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49 }
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50
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51 public string Translate(char[] data, int length) {
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52 Safe.ArgumentNotNull(data, "data");
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53 Safe.ArgumentInRange(length, 0, data.Length, "length");
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54
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55 var translated = new char[length];
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56
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57 Feed(data,length);
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58
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59 int pos = 0;
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60
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61 while (ReadTokenInternal()) {
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62 switch ((JSONGrammar.TokenType)TokenTags[0]) {
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63 case JSONGrammar.TokenType.UnescapedChar:
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64 Array.Copy(m_buffer,m_tokenOffset,translated,pos,m_tokenLen);
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65 pos += m_tokenLen;
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66 break;
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67 case JSONGrammar.TokenType.EscapedChar:
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68 translated[pos] = _escMap[m_buffer[m_tokenOffset + 1]];
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69 pos++;
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70 break;
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71 case JSONGrammar.TokenType.EscapedUnicode:
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72 translated[pos] = TranslateHexUnicode(m_buffer,m_tokenOffset + 2);
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73 pos++;
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74 break;
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75 }
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76 }
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77
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78 return new String(translated, 0, pos);
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79 }
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80
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81 internal static char TranslateEscapedChar(char symbol) {
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82 return _escMap[symbol];
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83 }
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84
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85 internal static char TranslateHexUnicode(char[] symbols, int offset) {
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86 Debug.Assert(symbols != null);
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87 Debug.Assert(symbols.Length - offset >= 4);
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88
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89 int value = (_hexMap[symbols[offset]] << 12)
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90 | (_hexMap[symbols[offset + 1]] << 8)
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91 | (_hexMap[symbols[offset + 2]] << 4)
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92 | (_hexMap[symbols[offset + 3]]);
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93 return (char)value;
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94 }
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95 }
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96 }
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