1 | using System;
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2 | using System.Collections.Generic;
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3 | using Lextm.SharpSnmpLib.Mib.Elements.Types;
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4 |
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5 | namespace Lextm.SharpSnmpLib.Mib.Elements.Entities
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6 | {
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7 | public sealed class ObjectType : EntityBase, ITypeReferrer
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8 | {
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9 | private ITypeAssignment _syntax;
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10 | private string _units;
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11 | private MaxAccess _access;
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12 | private Status _status;
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13 | private string _description;
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14 | private string _reference;
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15 | private IList<string> _indices;
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16 | private string _augments;
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17 | private string _defVal;
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18 |
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19 | public ObjectType(IModule module, SymbolList preAssignSymbols, ISymbolEnumerator symbols)
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20 | : base(module, preAssignSymbols, symbols)
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21 | {
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22 | ParseProperties(preAssignSymbols);
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23 | }
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24 |
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25 | private void ParseProperties(SymbolList header)
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26 | {
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27 | ISymbolEnumerator headerSymbols = header.GetSymbolEnumerator();
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28 | Symbol temp = headerSymbols.NextNonEOLSymbol();
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29 |
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30 | // Skip name
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31 | temp = headerSymbols.NextNonEOLSymbol();
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32 | temp.Expect(Symbol.ObjectType);
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33 |
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34 | _syntax = ParseSyntax (Module, headerSymbols);
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35 | _units = ParseUnits (headerSymbols);
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36 | _access = ParseAccess (headerSymbols);
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37 | _status = ParseStatus (headerSymbols);
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38 | _description = ParseDescription (headerSymbols);
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39 | _reference = ParseReference (headerSymbols);
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40 | _indices = ParseIndices (headerSymbols);
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41 | _augments = ParseAugments (headerSymbols);
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42 | _defVal = ParseDefVal (headerSymbols);
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43 | }
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44 |
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45 | private static string ParseAugments(ISymbolEnumerator symbols)
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46 | {
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47 | Symbol current = symbols.NextNonEOLSymbol();
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48 |
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49 | if (current == Symbol.Augments)
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50 | {
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51 | string augment = null;
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52 |
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53 | current = symbols.NextNonEOLSymbol();
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54 | current.Expect(Symbol.OpenBracket);
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55 |
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56 | current = symbols.NextNonEOLSymbol();
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57 | augment = current.ToString();
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58 |
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59 | current = symbols.NextNonEOLSymbol();
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60 | current.Expect(Symbol.CloseBracket);
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61 |
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62 | return augment;
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63 | }
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64 | else if (current != null)
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65 | {
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66 | symbols.PutBack(current);
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67 | }
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68 |
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69 | return null;
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70 | }
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71 |
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72 | private static string ParseDefVal(ISymbolEnumerator symbols)
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73 | {
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74 | Symbol current = symbols.NextNonEOLSymbol();
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75 |
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76 | if (current == Symbol.DefVal)
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77 | {
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78 | current = symbols.NextNonEOLSymbol();
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79 | current.Expect(Symbol.OpenBracket);
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80 |
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81 | string defVal = null;
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82 | current = symbols.NextNonEOLSymbol();
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83 |
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84 | if (current == Symbol.OpenBracket)
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85 | {
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86 | int depth = 1;
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87 | // TODO: decode this.
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88 | while (depth > 0)
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89 | {
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90 | current = symbols.NextNonEOLSymbol();
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91 | if (current == Symbol.OpenBracket)
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92 | {
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93 | depth++;
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94 | }
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95 | else if (current == Symbol.CloseBracket)
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96 | {
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97 | depth--;
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98 | }
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99 | }
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100 | }
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101 | else
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102 | {
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103 | defVal = current.ToString();
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104 | current = symbols.NextNonEOLSymbol();
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105 | current.Expect(Symbol.CloseBracket);
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106 | }
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107 |
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108 | return defVal;
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109 | }
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110 | else if (current != null)
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111 | {
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112 | symbols.PutBack(current);
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113 | }
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114 |
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115 | return null;
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116 | }
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117 |
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118 | private static IList<string> ParseIndices(ISymbolEnumerator symbols)
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119 | {
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120 | Symbol current = symbols.NextNonEOLSymbol();
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121 |
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122 | if (current == Symbol.Index)
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123 | {
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124 | current = symbols.NextNonEOLSymbol();
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125 | current.Expect(Symbol.OpenBracket);
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126 |
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127 | List<string> indices = new List<string>();
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128 |
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129 | while (current != Symbol.CloseBracket)
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130 | {
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131 | current = symbols.NextNonEOLSymbol();
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132 |
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133 | bool lastIndex = false;
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134 | if (current == Symbol.Implied)
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135 | {
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136 | current = symbols.NextNonEOLSymbol();
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137 | lastIndex = true; // 'IMPLIED' may only be used for last index
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138 | }
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139 |
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140 | current.Assert((current != Symbol.Comma) && (current != Symbol.CloseBracket), "Expected index name but found symbol!");
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141 | indices.Add(current.ToString());
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142 |
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143 | current = symbols.NextNonEOLSymbol();
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144 | if (lastIndex)
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145 | {
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146 | current.Expect(Symbol.CloseBracket);
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147 | }
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148 | else
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149 | {
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150 | current.Expect(Symbol.Comma, Symbol.CloseBracket);
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151 | }
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152 | }
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153 |
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154 | return indices;
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155 | }
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156 | else if (current != null)
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157 | {
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158 | symbols.PutBack(current);
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159 | }
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160 |
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161 | return null;
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162 | }
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163 |
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164 | private static string ParseReference(ISymbolEnumerator symbols)
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165 | {
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166 | Symbol current = symbols.NextNonEOLSymbol();
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167 |
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168 | if (current == Symbol.Reference)
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169 | {
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170 | return symbols.NextNonEOLSymbol().ToString();
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171 | }
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172 | else if (current != null)
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173 | {
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174 | symbols.PutBack(current);
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175 | }
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176 |
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177 | return null;
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178 | }
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179 |
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180 | private static string ParseDescription(ISymbolEnumerator symbols)
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181 | {
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182 | Symbol current = symbols.NextNonEOLSymbol();
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183 |
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184 | if (current == Symbol.Description)
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185 | {
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186 | return symbols.NextNonEOLSymbol().ToString().Trim(new char[] { '"' });
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187 | }
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188 | else if (current != null)
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189 | {
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190 | symbols.PutBack(current);
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191 | }
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192 |
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193 | return null;
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194 | }
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195 |
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196 | private static Status ParseStatus(ISymbolEnumerator symbols)
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197 | {
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198 | Status status = Status.obsolete;
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199 |
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200 | Symbol current = symbols.NextNonEOLSymbol();
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201 | current.Expect(Symbol.Status);
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202 |
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203 | current = symbols.NextNonEOLSymbol();
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204 | try
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205 | {
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206 | status = (Status)Enum.Parse(typeof(Status), current.ToString());
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207 | }
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208 | catch (ArgumentException)
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209 | {
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210 | current.Assert(false, "Invalid/Unknown status");
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211 | }
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212 |
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213 | return status;
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214 | }
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215 |
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216 | private static MaxAccess ParseAccess(ISymbolEnumerator symbols)
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217 | {
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218 | MaxAccess access = MaxAccess.notAccessible;
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219 |
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220 | Symbol current = symbols.NextNonEOLSymbol();
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221 | current.Expect(Symbol.MaxAccess, Symbol.Access);
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222 |
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223 | current = symbols.NextNonEOLSymbol();
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224 | switch (current.ToString())
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225 | {
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226 | case "not-accessible":
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227 | access = MaxAccess.notAccessible;
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228 | break;
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229 | case "accessible-for-notify":
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230 | access = MaxAccess.accessibleForNotify;
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231 | break;
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232 | case "read-only":
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233 | access = MaxAccess.readOnly;
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234 | break;
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235 | case "read-write":
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236 | access = MaxAccess.readWrite;
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237 | break;
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238 | case "read-create":
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239 | access = MaxAccess.readCreate;
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240 | break;
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241 | case "write-only":
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242 | access = MaxAccess.readWrite;
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243 | break;
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244 | default:
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245 | current.Assert(false, "Invalid/Unknown access");
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246 | break;
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247 | }
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248 |
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249 | return access;
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250 | }
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251 |
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252 | private static string ParseUnits(ISymbolEnumerator symbols)
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253 | {
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254 | Symbol current = symbols.NextNonEOLSymbol();
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255 |
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256 | if (current == Symbol.Units)
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257 | {
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258 | return symbols.NextNonEOLSymbol().ToString();
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259 | }
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260 | else if (current != null)
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261 | {
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262 | symbols.PutBack(current);
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263 | }
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264 |
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265 | return null;
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266 | }
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267 |
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268 | private static ITypeAssignment ParseSyntax(IModule module, ISymbolEnumerator symbols)
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269 | {
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270 | Symbol current = symbols.NextNonEOLSymbol();
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271 | current.Expect(Symbol.Syntax);
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272 |
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273 | return Lexer.ParseBasicTypeDef(module, String.Empty, symbols, isMacroSyntax: true);
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274 | }
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275 |
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276 | private static bool IsProperty(Symbol sym)
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277 | {
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278 | string s = sym.ToString();
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279 | return s == "SYNTAX" || s == "MAX-ACCESS" || s == "STATUS" || s == "DESCRIPTION";
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280 | }
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281 |
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282 | public ITypeAssignment Syntax
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283 | {
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284 | get { return _syntax; }
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285 | internal set { _syntax = value; }
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286 | }
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287 |
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288 | public override string Description
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289 | {
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290 | get { return _description; }
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291 | }
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292 |
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293 | public MaxAccess Access
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294 | {
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295 | get { return _access; }
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296 | }
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297 |
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298 | public IList<string> Indices
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299 | {
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300 | get { return _indices; }
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301 | }
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302 |
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303 | public string Augments
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304 | {
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305 | get { return _augments; }
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306 | }
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307 |
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308 | #region ITypeReferrer Member
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309 |
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310 | public ITypeAssignment ReferredType
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311 | {
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312 | get { return _syntax; }
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313 | set { _syntax = value; }
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314 | }
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315 |
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316 | public ITypeAssignment BaseType
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317 | {
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318 | get
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319 | {
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320 | ITypeReferrer tr = this;
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321 | ITypeAssignment result = null;
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322 |
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323 | while ((tr != null) && (tr.ReferredType != null))
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324 | {
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325 | result = tr.ReferredType;
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326 | tr = tr.ReferredType as ITypeReferrer;
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327 | }
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328 |
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329 | return result;
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330 | }
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331 | }
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332 |
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333 | #endregion
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334 |
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335 | }
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336 | }
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