1 | using System;
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2 |
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3 | namespace Lextm.SharpSnmpLib.Mib.Elements.Types
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4 | {
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5 | public sealed class TextualConvention : ITypeAssignment, ITypeReferrer
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6 | {
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7 | private IModule _module;
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8 | private string _name;
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9 | private DisplayHint _displayHint;
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10 | private Status _status;
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11 | private string _description;
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12 | private string _reference;
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13 | private ITypeAssignment _syntax;
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14 |
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15 | [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA1801:ReviewUnusedParameters", MessageId = "module")]
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16 | public TextualConvention(IModule module, string name, ISymbolEnumerator symbols)
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17 | {
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18 | _module = module;
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19 | _name = name;
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20 |
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21 | _displayHint = ParseDisplayHint(symbols);
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22 | _status = ParseStatus(symbols);
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23 | _description = ParseDescription(symbols);
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24 | _reference = ParseReference(symbols);
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25 | _syntax = ParseSyntax(module, symbols);
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26 | }
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27 |
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28 | private static DisplayHint ParseDisplayHint(ISymbolEnumerator symbols)
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29 | {
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30 | Symbol current = symbols.NextNonEOLSymbol();
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31 |
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32 | if (current == Symbol.DisplayHint)
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33 | {
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34 | return new DisplayHint(symbols.NextNonEOLSymbol().ToString().Trim(new char[] { '"' }));
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35 | }
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36 |
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37 | symbols.PutBack(current);
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38 | return null;
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39 | }
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40 |
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41 | private static Status ParseStatus(ISymbolEnumerator symbols)
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42 | {
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43 | Symbol current = symbols.NextNonEOLSymbol();
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44 | current.Expect(Symbol.Status);
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45 |
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46 | try
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47 | {
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48 | return (Status)Enum.Parse(typeof(Status), symbols.NextNonEOLSymbol().ToString());
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49 | }
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50 | catch (ArgumentException)
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51 | {
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52 | current.Assert(false, "Invalid/Unknown status");
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53 | }
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54 |
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55 | return Status.current;
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56 | }
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57 |
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58 | private static string ParseDescription(ISymbolEnumerator symbols)
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59 | {
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60 | Symbol current = symbols.NextNonEOLSymbol();
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61 | current.Expect(Symbol.Description);
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62 |
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63 | return symbols.NextNonEOLSymbol().ToString().Trim(new char[] { '"' });
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64 | }
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65 |
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66 | private static string ParseReference(ISymbolEnumerator symbols)
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67 | {
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68 | Symbol current = symbols.NextNonEOLSymbol();
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69 |
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70 | if (current == Symbol.Reference)
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71 | {
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72 | string reference = symbols.NextNonEOLSymbol().ToString();
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73 | if ((reference.Length >= 2) && reference.StartsWith("\"") && reference.EndsWith("\""))
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74 | {
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75 | return reference.Substring(1, reference.Length-2);
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76 | }
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77 |
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78 | return reference;
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79 | }
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80 |
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81 | symbols.PutBack(current);
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82 | return null;
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83 | }
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84 |
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85 | private static ITypeAssignment ParseSyntax(IModule module, ISymbolEnumerator symbols)
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86 | {
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87 | Symbol current = symbols.NextNonEOLSymbol();
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88 | current.Expect(Symbol.Syntax);
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89 |
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90 | /*
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91 | * RFC2579 definition:
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92 | * Syntax ::= -- Must be one of the following:
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93 | * -- a base type (or its refinement), or
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94 | * -- a BITS pseudo-type
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95 | * type
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96 | * | "BITS" "{" NamedBits "}"
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97 | *
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98 | * From section 3.5:
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99 | * The data structure must be one of the alternatives defined
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100 | * in the ObjectSyntax CHOICE or the BITS construct. Note
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101 | * that this means that the SYNTAX clause of a Textual
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102 | * Convention can not refer to a previously defined Textual
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103 | * Convention.
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104 | *
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105 | * The SYNTAX clause of a TEXTUAL CONVENTION macro may be
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106 | * sub-typed in the same way as the SYNTAX clause of an
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107 | * OBJECT-TYPE macro.
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108 | *
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109 | * Therefore the possible values are (grouped by underlying type):
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110 | * INTEGER, Integer32
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111 | * OCTET STRING, Opaque
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112 | * OBJECT IDENTIFIER
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113 | * IpAddress
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114 | * Counter64
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115 | * Unsigned32, Counter32, Gauge32, TimeTicks
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116 | * BITS
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117 | * With appropriate sub-typing.
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118 | */
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119 |
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120 | return Lexer.ParseBasicTypeDef(module, String.Empty, symbols, isMacroSyntax: true);
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121 | }
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122 |
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123 | public IModule Module
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124 | {
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125 | get { return _module; }
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126 | }
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127 |
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128 | public string Name
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129 | {
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130 | get { return _name; }
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131 | }
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132 |
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133 | public string DisplayHint
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134 | {
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135 | get { return _displayHint == null ? null : _displayHint.ToString(); }
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136 | }
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137 |
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138 | public Status Status
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139 | {
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140 | get { return _status; }
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141 | }
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142 |
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143 | public string Description
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144 | {
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145 | get { return _description; }
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146 | }
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147 |
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148 | public string Reference
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149 | {
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150 | get { return _reference; }
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151 | }
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152 |
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153 | public ITypeAssignment Syntax
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154 | {
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155 | get { return _syntax; }
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156 | }
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157 |
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158 | //internal object Decode(Variable v)
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159 | //{
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160 | // if (_syntax is IntegerType)
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161 | // {
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162 | // Integer32 i = v.Data as Integer32;
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163 | // if (i == null || (_syntax as IntegerType).IsEnumeration)
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164 | // {
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165 | // return null;
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166 | // }
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167 | // else if (_displayHint != null)
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168 | // {
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169 | // return _displayHint.Decode(i.ToInt32());
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170 | // }
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171 | // else
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172 | // {
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173 | // return i.ToInt32();
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174 | // }
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175 | // }
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176 | // else if (_syntax is UnsignedType)
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177 | // {
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178 | // Integer32 i = v.Data as Integer32;
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179 | // if (i == null)
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180 | // {
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181 | // return null;
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182 | // }
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183 | // else if (_displayHint != null)
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184 | // {
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185 | // return _displayHint.Decode(i.ToInt32());
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186 | // }
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187 | // else
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188 | // {
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189 | // return i.ToInt32();
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190 | // }
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191 | // }
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192 | // else if (_syntax is OctetStringType)
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193 | // {
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194 | // OctetString o = v.Data as OctetString;
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195 | // if (o == null)
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196 | // {
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197 | // return null;
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198 | // }
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199 | // else
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200 | // {
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201 | // // TODO: Follow the format specifier for octet strings.
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202 | // return null;
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203 | // }
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204 | // }
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205 | // else
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206 | // {
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207 | // return null;
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208 | // }
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209 | //}
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210 |
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211 | #region ITypeReferrer Member
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212 |
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213 | public ITypeAssignment ReferredType
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214 | {
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215 | get { return _syntax; }
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216 | set { _syntax = value; }
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217 | }
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218 |
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219 | public ITypeAssignment BaseType
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220 | {
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221 | get
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222 | {
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223 | ITypeReferrer tr = this;
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224 | ITypeAssignment result = this;
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225 |
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226 | while ((tr != null) && (tr.ReferredType != null))
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227 | {
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228 | result = tr.ReferredType;
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229 | tr = tr.ReferredType as ITypeReferrer;
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230 | }
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231 |
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232 | return result;
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233 | }
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234 | }
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235 |
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236 | #endregion
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237 | }
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238 | }
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