@@ -0,0 +1,30 | |||
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1 | using System; | |
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2 | using System.IO; | |
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3 | ||
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4 | namespace Implab.Formats { | |
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5 | public class ReaderScanner: TextScanner { | |
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6 | const int CHUNK_SIZE = 1024; | |
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7 | const int BUFFER_MAX = CHUNK_SIZE*1024; | |
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8 | ||
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9 | readonly TextReader m_reader; | |
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10 | ||
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11 | public ReaderScanner(TextReader reader, int limit, int chunk) : base(limit, chunk) { | |
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12 | Safe.ArgumentNotNull(reader, "reader"); | |
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13 | m_reader = reader; | |
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14 | } | |
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15 | ||
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16 | public ReaderScanner(TextReader reader) : this(reader, BUFFER_MAX, CHUNK_SIZE) { | |
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17 | } | |
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18 | ||
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19 | protected override int Read(char[] buffer, int offset, int size) { | |
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20 | return m_reader.Read(buffer, offset, size); | |
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21 | } | |
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22 | ||
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23 | protected override void Dispose(bool disposing) { | |
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24 | if (disposing) | |
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25 | Safe.Dispose(m_reader); | |
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26 | base.Dispose(disposing); | |
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27 | } | |
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28 | } | |
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29 | } | |
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30 |
@@ -0,0 +1,24 | |||
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1 | using System; | |
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2 | ||
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3 | namespace Implab.Formats { | |
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4 | public class ScannerContext<TTag> { | |
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5 | public int[,] Dfa { get; private set; } | |
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6 | public bool[] Final { get; private set; } | |
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7 | public TTag[][] Tags { get; private set; } | |
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8 | public int State { get; private set; } | |
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9 | public int[] Alphabet { get; private set; } | |
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10 | ||
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11 | public ScannerContext(int[,] dfa, bool[] final, TTag[][] tags, int state, int[] alphabet) { | |
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12 | Dfa = dfa; | |
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13 | Final = final; | |
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14 | Tags = tags; | |
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15 | State = state; | |
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16 | Alphabet = alphabet; | |
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17 | } | |
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18 | ||
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19 | public bool Execute(TextScanner scanner, out TTag[] tag) { | |
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20 | return scanner.ReadToken(Dfa, Final, Tags, State, Alphabet, out tag); | |
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21 | } | |
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22 | } | |
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23 | } | |
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24 |
@@ -0,0 +1,26 | |||
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1 | using System; | |
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2 | ||
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3 | namespace Implab.Formats { | |
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4 | public class StringScanner: TextScanner { | |
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5 | const int CHUNK_SIZE = 1024; | |
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6 | ||
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7 | readonly string m_text; | |
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8 | int m_pos; | |
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9 | ||
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10 | public StringScanner(string text) : base(text.Length, text.Length < CHUNK_SIZE ? text.Length : CHUNK_SIZE) { | |
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11 | m_text = text; | |
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12 | Feed(); | |
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13 | } | |
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14 | ||
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15 | protected override int Read(char[] buffer, int offset, int size) { | |
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16 | var actual = size + m_pos > m_text.Length ? m_text.Length - m_pos : size; | |
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17 | ||
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18 | m_text.CopyTo(m_pos,buffer,offset, actual); | |
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19 | ||
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20 | m_pos += actual; | |
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21 | ||
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22 | return actual; | |
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23 | } | |
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24 | } | |
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25 | } | |
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26 |
@@ -100,17 +100,25 namespace Implab.Automaton { | |||
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100 | 100 | return GetEnumerator(); |
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101 | 101 | } |
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102 | 102 | |
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103 |
public |
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104 |
var table = new |
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103 | public int[,] CreateTransitionTable() { | |
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104 | var table = new int[StateCount,AlphabetSize]; | |
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105 | ||
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106 | for (int i = 0; i < StateCount; i++) | |
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107 | for (int j = 0; i < AlphabetSize; j++) | |
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108 | table[i, j] = DFAConst.UNREACHABLE_STATE; | |
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105 | 109 | |
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106 |
foreach (var t in this) |
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107 |
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108 | table[t.s1] = new DFAStateDescriptor(AlphabetSize, IsFinalState(t.s1)); | |
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109 | if (table[t.s2].transitions == null) | |
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110 | table[t.s2] = new DFAStateDescriptor(AlphabetSize, IsFinalState(t.s2)); | |
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111 | table[t.s1].transitions[t.edge] = t.s2; | |
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110 | foreach (var t in this) | |
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111 | table[t.s1,t.edge] = t.s2; | |
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112 | ||
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113 | return table; | |
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112 | 114 |
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113 | 115 | |
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116 | public bool[] CreateFinalStateTable() { | |
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117 | var table = new bool[StateCount]; | |
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118 | ||
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119 | foreach (var s in FinalStates) | |
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120 | table[s] = true; | |
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121 | ||
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114 | 122 | return table; |
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115 | 123 | } |
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116 | 124 |
@@ -13,82 +13,38 namespace Implab.Automaton { | |||
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13 | 13 | /// to the input alphabet of the automaton. It's assumed that the index to the symbol match |
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14 | 14 | /// is well known and documented. |
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15 | 15 | /// </remarks> |
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16 |
public abstract class IndexedAlphabetBase<T> : |
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17 | int m_nextId = 1; | |
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18 | readonly int[] m_map; | |
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19 | ||
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20 | protected IndexedAlphabetBase(int mapSize) { | |
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21 | m_map = new int[mapSize]; | |
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22 | } | |
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23 | ||
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24 | protected IndexedAlphabetBase(int[] map) { | |
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25 | Debug.Assert(map != null && map.Length > 0); | |
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26 | Debug.Assert(map.All(x => x >= 0)); | |
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27 | ||
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28 | m_map = map; | |
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29 | m_nextId = map.Max() + 1; | |
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30 | } | |
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31 | ||
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32 | public int DefineSymbol(T symbol) { | |
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33 | var index = GetSymbolIndex(symbol); | |
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34 | if (m_map[index] == DFAConst.UNCLASSIFIED_INPUT) | |
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35 | m_map[index] = m_nextId++; | |
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36 | return m_map[index]; | |
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37 | } | |
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38 | ||
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39 | public int DefineSymbol(T symbol, int cls) { | |
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40 | var index = GetSymbolIndex(symbol); | |
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41 | m_map[index] = cls; | |
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42 | m_nextId = Math.Max(cls + 1, m_nextId); | |
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43 | return cls; | |
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44 | } | |
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16 | public abstract class IndexedAlphabetBase<T> : MapAlphabet<T> { | |
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45 | 17 | |
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46 | public int DefineClass(IEnumerable<T> symbols) { | |
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47 | return DefineClass(symbols, m_nextId); | |
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48 | } | |
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49 | ||
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50 | public int DefineClass(IEnumerable<T> symbols, int cls) { | |
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51 | Safe.ArgumentNotNull(symbols, "symbols"); | |
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52 | symbols = symbols.Distinct(); | |
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53 | ||
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54 | foreach (var symbol in symbols) | |
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55 | m_map[GetSymbolIndex(symbol)] = cls; | |
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56 | ||
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57 | m_nextId = Math.Max(cls + 1, m_nextId); | |
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58 | ||
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59 | return cls; | |
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60 | } | |
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61 | ||
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62 | public virtual int Translate(T symbol) { | |
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63 | return m_map[GetSymbolIndex(symbol)]; | |
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64 | } | |
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65 | ||
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66 | public int Count { | |
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67 | get { return m_nextId; } | |
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68 | } | |
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69 | ||
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70 | public bool Contains(T symbol) { | |
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71 | return true; | |
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72 | } | |
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73 | ||
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74 | public IEnumerable<T> GetSymbols(int cls) { | |
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75 | for (var i = 0; i < m_map.Length; i++) | |
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76 | if (m_map[i] == cls) | |
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77 | yield return GetSymbolByIndex(i); | |
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18 | protected IndexedAlphabetBase() :base(true, null) { | |
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78 | 19 | } |
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79 | 20 | |
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80 | 21 | public abstract int GetSymbolIndex(T symbol); |
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81 | 22 | |
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82 | public abstract T GetSymbolByIndex(int index); | |
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83 | ||
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84 | public abstract IEnumerable<T> InputSymbols { get; } | |
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85 | ||
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86 | 23 | /// <summary> |
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87 | 24 | /// Gets the translation map from the index of the symbol to it's class this is usefull for the optimized input symbols transtaion. |
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88 | 25 | /// </summary> |
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26 | /// <remarks> | |
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27 | /// The map is continous and start from the symbol with zero code. The last symbol | |
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28 | /// in the map is the last classified symbol in the alphabet, i.e. the map can be | |
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29 | /// shorter then the whole alphabet. | |
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30 | /// </remarks> | |
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89 | 31 | /// <returns>The translation map.</returns> |
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90 | 32 | public int[] GetTranslationMap() { |
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91 | return m_map; | |
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33 | Dictionary<int,int> map = new Dictionary<int, int>(); | |
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34 | ||
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35 | int max; | |
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36 | foreach (var p in Mappings) { | |
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37 | var index = GetSymbolIndex(p.Key); | |
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38 | max = Math.Max(max, index); | |
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39 | map[index] = p.Value; | |
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40 | } | |
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41 | ||
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42 | var result = new int[max + 1]; | |
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43 | ||
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44 | for (int i = 0; i < result.Length; i++) | |
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45 | map.TryGetValue(i, out result[i]); | |
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46 | ||
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47 | return result; | |
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92 | 48 | } |
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93 | 49 | } |
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94 | 50 | } |
@@ -69,9 +69,16 namespace Implab.Automaton { | |||
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69 | 69 | |
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70 | 70 | |
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71 | 71 | public IEnumerable<T> GetSymbols(int cls) { |
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72 | Safe.ArgumentAssert(cls > 0, "cls"); | |
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72 | 73 | return m_map.Where(p => p.Value == cls).Select(p => p.Key); |
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73 | 74 | } |
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74 | 75 | #endregion |
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76 | ||
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77 | public IEnumerable<KeyValuePair<T,int>> Mappings { | |
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78 | get { | |
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79 | return m_map; | |
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80 | } | |
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81 | } | |
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75 | 82 | } |
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76 | 83 | } |
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77 | 84 |
@@ -66,9 +66,9 namespace Implab.Automaton.RegularExpres | |||
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66 | 66 | return Token<TTag>.New( Enumerable.Range(0, AlphabetBuilder.Count).Except(TranslateOrDie(symbols)).ToArray() ); |
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67 | 67 | } |
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68 | 68 | |
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69 |
protected abstract IAlphabetB |
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69 | protected abstract IndexedAlphabetBase<TSymbol> CreateAlphabet(); | |
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70 | 70 | |
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71 |
protected |
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71 | protected ScannerContext<TTag> BuildScannerContext(Token<TTag> regexp) { | |
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72 | 72 | |
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73 | 73 | var dfa = new RegularDFA<TSymbol, TTag>(AlphabetBuilder); |
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74 | 74 | |
@@ -80,7 +80,16 namespace Implab.Automaton.RegularExpres | |||
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80 | 80 | if (dfa.IsFinalState(dfa.InitialState)) |
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81 | 81 | throw new ApplicationException("The specified language contains empty token"); |
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82 | 82 | |
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83 |
r |
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83 | var ab = CreateAlphabet(); | |
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84 | var optimal = dfa.Optimize(ab); | |
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85 | ||
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86 | return new ScannerContext<TTag>( | |
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87 | optimal.CreateTransitionTable(), | |
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88 | optimal.CreateFinalStateTable(), | |
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89 | optimal.CreateTagTable(), | |
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90 | optimal.InitialState, | |
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91 | ab.GetTranslationMap() | |
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92 | ); | |
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84 | 93 | } |
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85 | 94 | |
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86 | 95 | } |
@@ -36,16 +36,11 namespace Implab.Automaton.RegularExpres | |||
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36 | 36 | return m_tags.TryGetValue(s, out tags) ? tags : new TTag[0]; |
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37 | 37 | } |
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38 | 38 | |
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39 |
public |
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40 |
var table = new |
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39 | public TTag[][] CreateTagTable() { | |
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40 | var table = new TTag[StateCount][]; | |
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41 | 41 | |
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42 |
foreach (var |
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43 | if (table[t.s1].transitions == null) | |
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44 | table[t.s1] = new DFAStateDescriptor<TTag>(AlphabetSize, IsFinalState(t.s1), GetStateTag(t.s1)); | |
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45 | if (table[t.s2].transitions == null) | |
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46 | table[t.s2] = new DFAStateDescriptor<TTag>(AlphabetSize, IsFinalState(t.s2), GetStateTag(t.s2)); | |
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47 | table[t.s1].transitions[t.edge] = t.s2; | |
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48 | } | |
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42 | foreach (var pair in m_tags) | |
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43 | table[pair.Key] = pair.Value; | |
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49 | 44 | |
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50 | 45 | return table; |
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51 | 46 | } |
@@ -4,7 +4,7 using Implab.Automaton; | |||
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4 | 4 | |
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5 | 5 | namespace Implab.Formats { |
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6 | 6 | public class ByteAlphabet : IndexedAlphabetBase<byte> { |
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7 |
public ByteAlphabet() |
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7 | public ByteAlphabet() { | |
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8 | 8 | } |
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9 | 9 | |
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10 | 10 | #region implemented abstract members of IndexedAlphabetBase |
@@ -13,10 +13,6 namespace Implab.Formats { | |||
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13 | 13 | return (int)symbol; |
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14 | 14 | } |
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15 | 15 | |
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16 | public override byte GetSymbolByIndex(int index) { | |
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17 | return (byte)index; | |
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18 | } | |
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19 | ||
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20 | 16 | public IEnumerable<byte> InputSymbols { |
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21 | 17 | get { |
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22 | 18 | return Enumerable.Range(byte.MinValue, byte.MaxValue).Cast<byte>(); |
@@ -5,19 +5,14 using Implab.Automaton; | |||
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5 | 5 | namespace Implab.Formats { |
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6 | 6 | public class CharAlphabet: IndexedAlphabetBase<char> { |
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7 | 7 | |
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8 | public CharAlphabet() | |
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9 | : base(char.MaxValue + 1) { | |
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8 | public CharAlphabet() { | |
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10 | 9 | } |
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11 | 10 | |
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12 | 11 | public override int GetSymbolIndex(char symbol) { |
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13 | 12 | return symbol; |
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14 | 13 | } |
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15 | 14 | |
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16 |
public |
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17 | return (char)index; | |
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18 | } | |
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19 | ||
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20 | public override IEnumerable<char> InputSymbols { | |
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15 | public IEnumerable<char> InputSymbols { | |
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21 | 16 | get { return Enumerable.Range(char.MinValue, char.MaxValue).Cast<char>(); } |
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22 | 17 | } |
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23 | 18 | } |
@@ -20,14 +20,7 namespace Implab.Formats.JSON { | |||
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20 | 20 | StringBound, |
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21 | 21 | EscapedChar, |
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22 | 22 | UnescapedChar, |
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23 |
EscapedUnicode |
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24 | ||
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25 | Minus, | |
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26 | Plus, | |
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27 | Sign, | |
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28 | Integer, | |
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29 | Dot, | |
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30 | Exp | |
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23 | EscapedUnicode | |
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31 | 24 | } |
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32 | 25 | |
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33 | 26 | static Lazy<JSONGrammar> _instance = new Lazy<JSONGrammar>(); |
@@ -36,8 +29,8 namespace Implab.Formats.JSON { | |||
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36 | 29 | get { return _instance.Value; } |
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37 | 30 | } |
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38 | 31 | |
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39 |
readonly |
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40 |
readonly |
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32 | readonly ScannerContext<TokenType> m_jsonDFA; | |
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33 | readonly ScannerContext<TokenType> m_stringDFA; | |
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41 | 34 | |
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42 | 35 | public JSONGrammar() { |
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43 | 36 | DefineAlphabet(Enumerable.Range(0, 0x20).Select(x => (char)x)); |
@@ -88,17 +81,17 namespace Implab.Formats.JSON { | |||
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88 | 81 | .Or(unescaped.Closure().Tag(TokenType.UnescapedChar)); |
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89 | 82 | |
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90 | 83 | |
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91 |
m_jsonDFA = Build |
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92 |
m_stringDFA = Build |
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84 | m_jsonDFA = BuildScannerContext(jsonExpression); | |
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85 | m_stringDFA = BuildScannerContext(jsonStringExpression); | |
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93 | 86 | } |
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94 | 87 | |
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95 |
public |
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88 | public ScannerContext<TokenType> JsonDFA { | |
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96 | 89 | get { |
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97 | 90 | return m_jsonDFA; |
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98 | 91 | } |
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99 | 92 | } |
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100 | 93 | |
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101 |
public |
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94 | public ScannerContext<TokenType> JsonStringDFA { | |
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102 | 95 | get { |
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103 | 96 | return m_stringDFA; |
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104 | 97 | } |
@@ -1,25 +1,37 | |||
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1 | 1 | using System; |
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2 | 2 | using System.Globalization; |
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3 | 3 | using Implab.Automaton; |
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4 | using System.Text; | |
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5 | using Implab.Components; | |
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6 | using System.IO; | |
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7 | using Implab.Automaton.RegularExpressions; | |
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4 | 8 | |
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5 | 9 | namespace Implab.Formats.JSON { |
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6 | 10 | /// <summary> |
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7 | 11 | /// Сканнер (лексер), разбивающий поток символов на токены JSON. |
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8 | 12 | /// </summary> |
|
9 |
public class JSONScanner : |
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10 | char[] m_stringBuffer; | |
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11 | DFAStateDescriptior<>[] m_stringDFA; | |
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12 | int[] m_stringAlphabet; | |
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13 | public class JSONScanner : Disposable { | |
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14 | readonly StringBuilder m_builder = new StringBuilder(); | |
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15 | ||
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16 | readonly ScannerContext<JSONGrammar.TokenType> m_jsonScanner = JSONGrammar.Instance.JsonDFA; | |
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17 | readonly ScannerContext<JSONGrammar.TokenType> m_stringScanner = JSONGrammar.Instance.JsonStringDFA; | |
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18 | ||
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19 | ||
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20 | readonly TextScanner m_scanner; | |
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13 | 21 | |
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14 | 22 | /// <summary> |
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15 | 23 | /// Создает новый экземпляр сканнера |
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16 | 24 | /// </summary> |
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17 | public JSONScanner() | |
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18 | : base(JSONGrammar.Instance.JsonDFA.GetTransitionTable(), JSONGrammar.Instance.JsonDFA.Alphabet.GetTranslationMap()) { | |
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19 | m_stringBuffer = new char[1024]; | |
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20 | var dfa = JSONGrammar.Instance.JsonStringDFA; | |
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21 | m_stringAlphabet = dfa.Alphabet.GetTranslationMap(); | |
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22 | m_stringDFA = dfa.States; | |
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25 | public JSONScanner(string text) { | |
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26 | Safe.ArgumentNotEmpty(text, "text"); | |
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27 | ||
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28 | m_scanner = new StringScanner(text); | |
|
29 | } | |
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30 | ||
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31 | public JSONScanner(TextReader reader, int bufferMax, int chunkSize) { | |
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32 | Safe.ArgumentNotNull(reader, "reader"); | |
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33 | ||
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34 | m_scanner = new ReaderScanner(reader); | |
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23 | 35 | } |
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24 | 36 | |
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25 | 37 | /// <summary> |
@@ -31,19 +43,20 namespace Implab.Formats.JSON { | |||
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31 | 43 | /// <remarks>В случе если токен не распознается, возникает исключение. Значения токенов обрабатываются, т.е. |
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32 | 44 | /// в строках обрабатываются экранированные символы, числа становтся типа double.</remarks> |
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33 | 45 | public bool ReadToken(out object tokenValue, out JsonTokenType tokenType) { |
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34 | if (ReadTokenInternal()) { | |
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35 | switch ((JSONGrammar.TokenType)m_currentState.tag[0]) { | |
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46 | JSONGrammar.TokenType[] tag; | |
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47 | if (m_jsonScanner.Execute(m_scanner, out tag)) { | |
|
48 | switch (tag[0]) { | |
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36 | 49 | case JSONGrammar.TokenType.StringBound: |
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37 | 50 | tokenValue = ReadString(); |
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38 | 51 | tokenType = JsonTokenType.String; |
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39 | 52 | break; |
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40 | 53 | case JSONGrammar.TokenType.Number: |
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41 |
tokenValue = Double.Parse( |
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54 | tokenValue = Double.Parse(m_scanner.GetTokenValue(), CultureInfo.InvariantCulture); | |
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42 | 55 | tokenType = JsonTokenType.Number; |
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43 | 56 | break; |
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44 | 57 | default: |
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45 |
tokenType = (JsonTokenType) |
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|
46 |
tokenValue = |
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|
58 | tokenType = (JsonTokenType)tag[0]; | |
|
59 | tokenValue = m_scanner.GetTokenValue(); | |
|
47 | 60 | break; |
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48 | 61 | } |
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49 | 62 | return true; |
@@ -55,26 +68,26 namespace Implab.Formats.JSON { | |||
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55 | 68 | |
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56 | 69 | string ReadString() { |
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57 | 70 | int pos = 0; |
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58 | Switch(m_stringDFA, m_stringAlphabet); | |
|
59 | while (ReadTokenInternal()) { | |
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60 |
|
|
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71 | char[] buf = new char[6]; // the buffer for unescaping chars | |
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72 | ||
|
73 | JSONGrammar.TokenType[] tag; | |
|
74 | m_builder.Clear(); | |
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75 | ||
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76 | while (m_stringScanner.Execute(m_scanner, out tag)) { | |
|
77 | switch (tag[0]) { | |
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61 | 78 | case JSONGrammar.TokenType.StringBound: |
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62 |
|
|
|
63 | return new String(m_stringBuffer, 0, pos); | |
|
79 | return m_builder.ToString(); | |
|
64 | 80 | case JSONGrammar.TokenType.UnescapedChar: |
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65 | EnsureStringBufferSize(pos + m_tokenLen); | |
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66 | Array.Copy(m_buffer, m_tokenOffset, m_stringBuffer, pos, m_tokenLen); | |
|
67 | pos += m_tokenLen; | |
|
81 | m_scanner.CopyTokenTo(m_builder); | |
|
68 | 82 | break; |
|
69 | case JSONGrammar.TokenType.EscapedUnicode: | |
|
70 | EnsureStringBufferSize(pos + 1); | |
|
71 |
m_ |
|
|
83 | case JSONGrammar.TokenType.EscapedUnicode: // \xXXXX - unicode escape sequence | |
|
84 | m_scanner.CopyTokenTo(buf, 0); | |
|
85 | m_builder.Append(StringTranslator.TranslateHexUnicode(buf, 2)); | |
|
72 | 86 | pos++; |
|
73 | 87 | break; |
|
74 | case JSONGrammar.TokenType.EscapedChar: | |
|
75 |
|
|
|
76 |
m_ |
|
|
77 | pos++; | |
|
88 | case JSONGrammar.TokenType.EscapedChar: // \t - escape sequence | |
|
89 | m_scanner.CopyTokenTo(buf, 0); | |
|
90 | m_builder.Append(StringTranslator.TranslateEscapedChar(buf[1])); | |
|
78 | 91 | break; |
|
79 | 92 | default: |
|
80 | 93 | break; |
@@ -84,13 +97,5 namespace Implab.Formats.JSON { | |||
|
84 | 97 | |
|
85 | 98 | throw new ParserException("Unexpected end of data"); |
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86 | 99 | } |
|
87 | ||
|
88 | void EnsureStringBufferSize(int size) { | |
|
89 | if (size > m_stringBuffer.Length) { | |
|
90 | var newBuffer = new char[size]; | |
|
91 | m_stringBuffer.CopyTo(newBuffer, 0); | |
|
92 | m_stringBuffer = newBuffer; | |
|
93 | 100 | } |
|
94 | 101 | } |
|
95 | } | |
|
96 | } |
@@ -1,5 +1,5 | |||
|
1 | 1 | using Implab; |
|
2 |
using Implab. |
|
|
2 | using Implab.Formats; | |
|
3 | 3 | using System; |
|
4 | 4 | using System.Collections.Generic; |
|
5 | 5 | using System.Diagnostics; |
@@ -7,11 +7,11 using System.Linq; | |||
|
7 | 7 | using System.Text; |
|
8 | 8 | using System.Threading.Tasks; |
|
9 | 9 | |
|
10 | namespace Implab.JSON { | |
|
10 | namespace Implab.Formats.JSON { | |
|
11 | 11 | /// <summary> |
|
12 | 12 | /// Класс для преобразования экранированной строки JSON |
|
13 | 13 | /// </summary> |
|
14 | public class StringTranslator : Scanner { | |
|
14 | public class StringTranslator : TextScanner<JSONGrammar.TokenType> { | |
|
15 | 15 | static readonly char[] _escMap; |
|
16 | 16 | static readonly int[] _hexMap; |
|
17 | 17 | |
@@ -34,8 +34,7 namespace Implab.JSON { | |||
|
34 | 34 | |
|
35 | 35 | } |
|
36 | 36 | |
|
37 | public StringTranslator() | |
|
38 | : base(JSONGrammar.Instance.JsonStringDFA.States, JSONGrammar.Instance.JsonStringDFA.Alphabet.GetTranslationMap()) { | |
|
37 | public StringTranslator() { | |
|
39 | 38 | } |
|
40 | 39 | |
|
41 | 40 | public string Translate(string data) { |
@@ -59,7 +58,7 namespace Implab.JSON { | |||
|
59 | 58 | int pos = 0; |
|
60 | 59 | |
|
61 | 60 | while (ReadTokenInternal()) { |
|
62 |
switch ((JSONGrammar.TokenType) |
|
|
61 | switch ((JSONGrammar.TokenType)Tags[0]) { | |
|
63 | 62 | case JSONGrammar.TokenType.UnescapedChar: |
|
64 | 63 | Array.Copy(m_buffer,m_tokenOffset,translated,pos,m_tokenLen); |
|
65 | 64 | pos += m_tokenLen; |
@@ -3,50 +3,146 using Implab.Components; | |||
|
3 | 3 | using Implab.Automaton.RegularExpressions; |
|
4 | 4 | using System.Diagnostics; |
|
5 | 5 | using Implab.Automaton; |
|
6 | using System.IO; | |
|
7 | using System.Text; | |
|
6 | 8 | |
|
7 | 9 | namespace Implab.Formats { |
|
8 |
public abstract class TextScanner |
|
|
10 | public abstract class TextScanner : Disposable { | |
|
11 | readonly int m_bufferMax; | |
|
12 | readonly int m_chunkSize; | |
|
9 | 13 | |
|
10 | int m_maxSymbol; | |
|
11 | int[] m_symbolMap; | |
|
12 | ||
|
13 | readonly char[] m_buffer; | |
|
14 | char[] m_buffer; | |
|
14 | 15 | int m_bufferOffset; |
|
15 | 16 | int m_bufferSize; |
|
17 | int m_tokenOffset; | |
|
16 | 18 | int m_tokenLength; |
|
17 | 19 | |
|
18 | TTag[] m_tags; | |
|
20 | /// <summary> | |
|
21 | /// Initializes a new instance of the <see cref="Implab.Formats.TextScanner`1"/> class. | |
|
22 | /// </summary> | |
|
23 | /// <param name="bufferMax">Buffer max.</param> | |
|
24 | /// <param name="chunkSize">Chunk size.</param> | |
|
25 | protected TextScanner(int bufferMax, int chunkSize) { | |
|
26 | Debug.Assert(m_chunkSize <= m_bufferMax); | |
|
27 | ||
|
28 | m_bufferMax = bufferMax; | |
|
29 | m_chunkSize = chunkSize; | |
|
30 | } | |
|
19 | 31 | |
|
20 | protected bool ReadTokenInternal(DFAStateDescriptor<TTag>[] dfa, int state) { | |
|
21 | Debug.Assert(dfa != null); | |
|
32 | /// <summary> | |
|
33 | /// Initializes a new instance of the <see cref="Implab.Formats.TextScanner`1"/> class. | |
|
34 | /// </summary> | |
|
35 | /// <param name="buffer">Buffer.</param> | |
|
36 | protected TextScanner(char[] buffer) { | |
|
37 | if (buffer != null) { | |
|
38 | m_buffer = buffer; | |
|
39 | m_bufferSize = buffer.Length; | |
|
40 | } | |
|
41 | } | |
|
42 | ||
|
43 | /// <summary> | |
|
44 | /// (hungry) Reads the next token. | |
|
45 | /// </summary> | |
|
46 | /// <returns><c>true</c>, if token internal was read, <c>false</c> if there is no more tokens in the stream.</returns> | |
|
47 | /// <param name="dfa">The transition map for the automaton</param> | |
|
48 | /// <param name="final">Final states of the automaton.</param> | |
|
49 | /// <param name="tags">Tags.</param> | |
|
50 | /// <param name="state">The initial state for the automaton.</param> | |
|
51 | internal bool ReadToken<TTag>(int[,] dfa, int[] final, TTag[][] tags, int state, int[] alphabet, out TTag[] tag) { | |
|
52 | Safe.ArgumentNotNull(); | |
|
53 | m_tokenLength = 0; | |
|
54 | ||
|
55 | var maxSymbol = alphabet.Length - 1; | |
|
22 | 56 | |
|
23 | 57 | do { |
|
24 | for (var pos = m_bufferOffset; pos < m_bufferSize; pos++) { | |
|
58 | // after the next chunk is read the offset in the buffer may change | |
|
59 | int pos = m_bufferOffset + m_tokenLength; | |
|
60 | ||
|
61 | while(pos < m_bufferSize) { | |
|
25 | 62 | var ch = m_buffer[pos]; |
|
26 | state = dfa[state].transitions[m_symbolMap[ch > m_maxSymbol ? m_maxSymbol : ch]]; | |
|
63 | ||
|
64 | state = dfa[state,ch > maxSymbol ? DFAConst.UNCLASSIFIED_INPUT : alphabet[ch]]; | |
|
27 | 65 | if (state == DFAConst.UNREACHABLE_STATE) |
|
28 | 66 | break; |
|
67 | ||
|
68 | pos++; | |
|
29 | 69 | } |
|
30 | } while (Feed()); | |
|
70 | ||
|
71 | m_tokenLength = pos - m_bufferOffset; | |
|
72 | } while (state != DFAConst.UNREACHABLE_STATE && Feed()); | |
|
73 | ||
|
74 | m_tokenOffset = m_bufferOffset; | |
|
75 | m_bufferOffset += m_tokenLength; | |
|
31 | 76 | |
|
32 |
if ( |
|
|
77 | if (final[state]) { | |
|
78 | tag = tags[state]; | |
|
79 | return true; | |
|
80 | } else { | |
|
81 | if (m_bufferOffset == m_bufferSize) { | |
|
82 | if (m_tokenLength == 0) //EOF | |
|
83 | return false; | |
|
84 | ||
|
85 | throw new ParserException(); | |
|
86 | } | |
|
87 | throw new ParserException(String.Format("Unexpected symbol '{0}'", m_buffer[m_bufferOffset])); | |
|
33 | 88 | |
|
34 | 89 | } |
|
90 | } | |
|
35 | 91 | |
|
92 | protected void Feed(char[] buffer, int offset, int length) { | |
|
93 | m_buffer = buffer; | |
|
94 | m_bufferOffset = offset; | |
|
95 | m_bufferSize = offset + length; | |
|
36 | 96 | } |
|
37 | 97 | |
|
38 | bool Feed() { | |
|
98 | protected bool Feed() { | |
|
99 | if (m_chunkSize <= 0) | |
|
100 | return false; | |
|
101 | ||
|
102 | if (m_buffer != null) { | |
|
103 | var free = m_buffer.Length - m_bufferSize; | |
|
104 | ||
|
105 | if (free < m_chunkSize) { | |
|
106 | free += m_chunkSize; | |
|
107 | var used = m_bufferSize - m_bufferOffset; | |
|
108 | var size = used + free; | |
|
109 | ||
|
110 | if (size > m_bufferMax) | |
|
111 | throw new ParserException(String.Format("The buffer limit ({0} Kb) is reached"), m_bufferMax/1024); | |
|
112 | ||
|
113 | var temp = new char[size]; | |
|
39 | 114 | |
|
115 | var read = Read(temp, used, m_chunkSize); | |
|
116 | if (read == 0) | |
|
117 | return false; | |
|
118 | ||
|
119 | Array.Copy(m_buffer, m_bufferOffset, temp, 0, used); | |
|
120 | ||
|
121 | m_bufferOffset = 0; | |
|
122 | m_bufferSize = used + read; | |
|
123 | m_buffer = temp; | |
|
124 | } | |
|
125 | } else { | |
|
126 | Debug.Assert(m_bufferOffset == 0); | |
|
127 | m_buffer = new char[m_chunkSize]; | |
|
128 | m_bufferSize = Read(m_buffer, 0, m_chunkSize); | |
|
129 | return (m_bufferSize != 0); | |
|
130 | } | |
|
40 | 131 | } |
|
41 | 132 | |
|
42 | 133 | protected abstract int Read(char[] buffer, int offset, int size); |
|
43 | 134 | |
|
44 | protected TTag[] Tags { | |
|
45 | get { | |
|
46 | return m_tags; | |
|
47 | } | |
|
135 | public string GetTokenValue() { | |
|
136 | return new String(m_buffer, m_tokenOffset, m_tokenLength); | |
|
48 | 137 | } |
|
49 | 138 | |
|
139 | public void CopyTokenTo(char[] buffer, int offset) { | |
|
140 | m_buffer.CopyTo(buffer, offset); | |
|
141 | } | |
|
142 | ||
|
143 | public void CopyTokenTo(StringBuilder sb) { | |
|
144 | sb.Append(m_buffer, m_tokenOffset, m_tokenLength); | |
|
145 | } | |
|
50 | 146 | |
|
51 | 147 | } |
|
52 | 148 | } |
@@ -151,11 +151,9 | |||
|
151 | 151 | <Compile Include="Components\ExecutionState.cs" /> |
|
152 | 152 | <Compile Include="Components\RunnableComponent.cs" /> |
|
153 | 153 | <Compile Include="Components\IFactory.cs" /> |
|
154 | <Compile Include="Automaton\DFAStateDescriptor.cs" /> | |
|
155 | 154 | <Compile Include="Automaton\EnumAlphabet.cs" /> |
|
156 | 155 | <Compile Include="Automaton\IAlphabet.cs" /> |
|
157 | 156 | <Compile Include="Automaton\ParserException.cs" /> |
|
158 | <Compile Include="Automaton\Scanner.cs" /> | |
|
159 | 157 | <Compile Include="Automaton\IndexedAlphabetBase.cs" /> |
|
160 | 158 | <Compile Include="Automaton\IAlphabetBuilder.cs" /> |
|
161 | 159 | <Compile Include="Automaton\RegularExpressions\AltToken.cs" /> |
@@ -190,9 +188,10 | |||
|
190 | 188 | <Compile Include="Automaton\RegularExpressions\RegularDFA.cs" /> |
|
191 | 189 | <Compile Include="Automaton\RegularExpressions\RegularExpressionVisitor.cs" /> |
|
192 | 190 | <Compile Include="Automaton\RegularExpressions\ITaggedDFABuilder.cs" /> |
|
193 | <Compile Include="Automaton\RegularExpressions\DFAStateDescriptorT.cs" /> | |
|
194 | <Compile Include="Formats\BufferScanner.cs" /> | |
|
195 | 191 | <Compile Include="Formats\TextScanner.cs" /> |
|
192 | <Compile Include="Formats\StringScanner.cs" /> | |
|
193 | <Compile Include="Formats\ReaderScanner.cs" /> | |
|
194 | <Compile Include="Formats\ScannerContext.cs" /> | |
|
196 | 195 | </ItemGroup> |
|
197 | 196 | <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" /> |
|
198 | 197 | <ItemGroup /> |
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