[457] | 1 | using System;
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| 2 | using System.Collections.Generic;
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| 3 | using System.Linq;
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| 4 | using System.Text;
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| 5 |
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| 6 | namespace Lextm.SharpSnmpLib.Mib
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| 7 | {
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| 8 | public class SymbolList : List<Symbol>
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| 9 | {
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| 10 | public class SymbolEnumerator : ISymbolEnumerator
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| 11 | {
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| 12 | private SymbolList _list = null;
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| 13 | private int _index = -1;
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| 14 |
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| 15 | internal SymbolEnumerator(SymbolList list)
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| 16 | {
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| 17 | if (list == null)
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| 18 | {
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| 19 | throw new ArgumentNullException("lexer");
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| 20 | }
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| 21 |
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| 22 | _list = list;
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| 23 | }
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| 24 |
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| 25 | #region ISymbolEnumerator Member
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| 26 |
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| 27 | public bool PutBack(Symbol item)
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| 28 | {
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| 29 | if ((_index < 0) || (_index >= _list.Count) || (item != _list[_index]))
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| 30 | {
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| 31 | throw new ArgumentException(@"wrong last symbol", "last");
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| 32 | //return false;
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| 33 | }
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| 34 |
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| 35 | _index--;
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| 36 | return true;
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| 37 | }
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| 38 |
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| 39 | #endregion
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| 40 |
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| 41 | #region IEnumerator<Symbol> Member
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| 42 |
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| 43 | public Symbol Current
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| 44 | {
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| 45 | get
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| 46 | {
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| 47 | if ((_index >= 0) && (_index <= _list.Count))
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| 48 | {
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| 49 | return _list[_index];
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| 50 | }
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| 51 |
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| 52 | return null;
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| 53 | }
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| 54 | }
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| 55 |
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| 56 | #endregion
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| 57 |
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| 58 | #region IDisposable Member
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| 59 |
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| 60 | public void Dispose()
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| 61 | {
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| 62 | }
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| 63 |
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| 64 | #endregion
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| 65 |
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| 66 | #region IEnumerator Member
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| 67 |
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| 68 | object System.Collections.IEnumerator.Current
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| 69 | {
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| 70 | get { return this.Current; }
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| 71 | }
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| 72 |
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| 73 | public bool MoveNext()
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| 74 | {
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| 75 | _index++;
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| 76 | return (_index >= 0) && (_index < _list.Count);
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| 77 | }
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| 78 |
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| 79 | public void Reset()
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| 80 | {
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| 81 | _index = -1;
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| 82 | }
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| 83 |
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| 84 | #endregion
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| 85 | }
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| 86 |
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| 87 | /// <summary>
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| 88 | /// Initializes a new instance of the <see cref="SymbolList"/> class.
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| 89 | /// </summary>
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| 90 | public SymbolList()
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| 91 | {
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| 92 | }
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| 93 |
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| 94 | public ISymbolEnumerator GetSymbolEnumerator()
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| 95 | {
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| 96 | return new SymbolEnumerator(this);
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| 97 | }
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| 98 |
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| 99 | public string Join(string separator)
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| 100 | {
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| 101 | if (separator == null)
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| 102 | separator = "";
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| 103 |
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| 104 | StringBuilder result = new StringBuilder();
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| 105 |
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| 106 | foreach (Symbol s in this)
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| 107 | {
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| 108 | result.Append(s);
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| 109 | result.Append(separator);
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| 110 | }
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| 111 |
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| 112 | if (result.Length > 0)
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| 113 | {
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| 114 | result.Length -= separator.Length;
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| 115 | }
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| 116 |
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| 117 | return result.ToString();
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| 118 | }
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| 119 | }
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| 120 |
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| 121 | public static class SymbolEnumeratorExtension
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| 122 | {
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| 123 | public static Symbol NextSymbol(this IEnumerator<Symbol> enumerator)
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| 124 | {
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| 125 | if (enumerator.MoveNext())
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| 126 | {
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| 127 | return enumerator.Current;
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| 128 | }
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| 129 |
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| 130 | return null;
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| 131 | }
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| 132 |
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| 133 | public static Symbol NextNonEOLSymbol(this IEnumerator<Symbol> enumerator)
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| 134 | {
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| 135 | while (enumerator.MoveNext())
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| 136 | {
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| 137 | if (enumerator.Current != Symbol.EOL)
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| 138 | {
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| 139 | return enumerator.Current;
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| 140 | }
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| 141 | }
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| 142 |
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| 143 | return null;
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| 144 | }
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| 145 | }
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| 146 | }
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