mcs/mbas/support.cs

   1 //
   2 // support.cs: Support routines to work around the fact that System.Reflection.Emit
   3 // can not introspect types that are being constructed
   4 //
   5 // Author:
   6 //   Miguel de Icaza (miguel@ximian.com)
   7 //
   8 // (C) 2001 Ximian, Inc (http://www.ximian.com)
   9 //
  10
  11 using System;
  12 using System.Text;
  13 using System.Reflection;
  14 using System.Collections;
  15 using System.Reflection.Emit;
  16 using System.Globalization;
  17
  18 namespace Mono.MonoBASIC {
  19
  20         public interface ParameterData {
  21                 Type ParameterType (int pos);
  22                 int  Count { get; }
  23                 string ParameterName (int pos);
  24                 string ParameterDesc (int pos);
  25                 Parameter.Modifier ParameterModifier (int pos);
  26         }
  27
  28         public class ReflectionParameters : ParameterData {
  29                 ParameterInfo [] pi;
  30                 bool last_arg_is_params = false;
  31
  32                 public ReflectionParameters (ParameterInfo [] pi)
  33                 {
  34                         object [] attrs;
  35
  36                         this.pi = pi;
  37
  38                         int count = pi.Length-1;
  39
  40                         if (count >= 0) {
  41                                 attrs = pi [count].GetCustomAttributes (TypeManager.param_array_type, true);
  42
  43                                 if (attrs == null)
  44                                         return;
  45
  46                                 if (attrs.Length == 0)
  47                                         return;
  48
  49                                 last_arg_is_params = true;
  50                         }
  51                 }
  52
  53                 public Type ParameterType (int pos)
  54                 {
  55                         if (last_arg_is_params && pos >= pi.Length - 1)
  56                                 return pi [pi.Length - 1].ParameterType;
  57                         else
  58                                 if (pos >= pi.Length)
  59                                         return null;
  60                                 else
  61                                         return pi [pos].ParameterType;
  62                 }
  63
  64                 public string ParameterName (int pos)
  65                 {
  66                         if (last_arg_is_params && pos >= pi.Length - 1)
  67                                 return pi [pi.Length - 1].Name;
  68                         else
  69                                 return pi [pos].Name;
  70                 }
  71
  72                 public string ParameterDesc (int pos)
  73                 {
  74                         StringBuilder sb = new StringBuilder ();
  75
  76                         if (pi [pos].IsOut)
  77                                 sb.Append ("out ");
  78
  79                         if (pi [pos].IsIn)
  80                                 sb.Append ("in ");
  81
  82                         if (pos >= pi.Length - 1 && last_arg_is_params)
  83                                 sb.Append ("params ");
  84
  85                         sb.Append (TypeManager.MonoBASIC_Name (ParameterType (pos)));
  86
  87                         return sb.ToString ();
  88
  89                 }
  90
  91                 public Parameter.Modifier ParameterModifier (int pos)
  92                 {
  93                         int len = pi.Length;
  94
  95                         if (pos >= len - 1)
  96                                 if (last_arg_is_params)
  97                                         return Parameter.Modifier.PARAMS;
  98
  99                         Type t = pi [pos].ParameterType;
 100                         if (t.IsByRef)
 101                                 return Parameter.Modifier.ISBYREF;
 102
 103                         return Parameter.Modifier.NONE;
 104                 }
 105
 106                 public int Count {
 107                         get {
 108                                 return pi.Length;
 109                         }
 110                 }
 111
 112         }
 113
 114         public class InternalParameters : ParameterData {
 115                 Type [] param_types;
 116
 117                 public readonly Parameters Parameters;
 118
 119                 public InternalParameters (Type [] param_types, Parameters parameters)
 120                 {
 121                         this.param_types = param_types;
 122                         this.Parameters = parameters;
 123                 }
 124
 125                 public InternalParameters (DeclSpace ds, Parameters parameters)
 126                         : this (parameters.GetParameterInfo (ds), parameters)
 127                 {
 128                 }
 129
 130                 public int Count {
 131                         get {
 132                                 if (param_types == null)
 133                                         return 0;
 134
 135                                 return param_types.Length;
 136                         }
 137                 }
 138
 139                 public Type ParameterType (int pos)
 140                 {
 141                         if (param_types == null)
 142                                 return null;
 143
 144                         Parameter [] fixed_pars = Parameters.FixedParameters;
 145                         if (fixed_pars != null){
 146                                 int len = fixed_pars.Length;
 147                                 if (pos < len)
 148                                         return Parameters.FixedParameters [pos].ParameterType;
 149                                 else
 150                                         return Parameters.ArrayParameter.ParameterType;
 151                         } else
 152                                 return Parameters.ArrayParameter.ParameterType;
 153                 }
 154
 155                 public string ParameterName (int pos)
 156                 {
 157                         Parameter p;
 158
 159                         if (pos >= Parameters.FixedParameters.Length)
 160                                 p = Parameters.ArrayParameter;
 161                         else
 162                                 p = Parameters.FixedParameters [pos];
 163
 164                         return p.Name;
 165                 }
 166
 167                 public string ParameterDesc (int pos)
 168                 {
 169                         string tmp = String.Empty;
 170                         Parameter p;
 171
 172                         if (pos >= Parameters.FixedParameters.Length)
 173                                 p = Parameters.ArrayParameter;
 174                         else
 175                                 p = Parameters.FixedParameters [pos];
 176
 177                         if (p.ModFlags == Parameter.Modifier.REF)
 178                                 tmp = "ref ";
 179                         else if (p.ModFlags == Parameter.Modifier.OUT)
 180                                 tmp = "out ";
 181                         else if (p.ModFlags == Parameter.Modifier.PARAMS)
 182                                 tmp = "params ";
 183
 184                         Type t = ParameterType (pos);
 185
 186                         return tmp + TypeManager.MonoBASIC_Name (t);
 187                 }
 188
 189                 public Parameter.Modifier ParameterModifier (int pos)
 190                 {
 191                         Parameter.Modifier mod;
 192
 193                         if (Parameters.FixedParameters == null) {
 194                                 if (Parameters.ArrayParameter != null)
 195                                         mod = Parameters.ArrayParameter.ModFlags;
 196                                 else
 197                                         mod = Parameter.Modifier.NONE;
 198                         } else if (pos >= Parameters.FixedParameters.Length)
 199                                 mod = Parameters.ArrayParameter.ModFlags;
 200                         else
 201                                 mod = Parameters.FixedParameters [pos].ModFlags;
 202
 203                         if ((mod & (Parameter.Modifier.REF | Parameter.Modifier.OUT)) != 0)
 204                                 mod |= Parameter.Modifier.ISBYREF;
 205
 206                         return mod;
 207                 }
 208
 209         }
 210
 211         class PtrHashtable : Hashtable {
 212                 class PtrComparer : IComparer {
 213                         public int Compare (object x, object y)
 214                         {
 215                                 if (x == y)
 216                                         return 0;
 217                                 else
 218                                         return 1;
 219                         }
 220                 }
 221
 222                 public PtrHashtable ()
 223                 {
 224                         comparer = new PtrComparer ();
 225                         hcp = new CaseInsensitiveHashCodeProvider();
 226                 }
 227         }
 228
 229
 230         public class CaseInsensitiveHashtable : Hashtable {
 231                 public CaseInsensitiveHashtable() : base()
 232                 {
 233                         comparer = new CaseInsensitiveComparer();
 234                         hcp = new CaseInsensitiveHashCodeProvider();
 235                 }
 236         }
 237
 238         //
 239         // Compares member infos based on their name and
 240         // also allows one argument to be a string
 241         //
 242         class MemberInfoCompare : IComparer {
 243
 244                 public int Compare (object a, object b)
 245                 {
 246                         if (a == null || b == null){
 247                                 Console.WriteLine ("Invalid information passed");
 248                                 throw new Exception ();
 249                         }
 250
 251                         if (a is string)
 252                                 return String.Compare ((string) a, ((MemberInfo)b).Name);
 253
 254                         if (b is string)
 255                                 return String.Compare (((MemberInfo)a).Name, (string) b);
 256
 257                         return String.Compare (((MemberInfo)a).Name, ((MemberInfo)b).Name);
 258                 }
 259         }
 260
 261         struct Pair {
 262                 public object First;
 263                 public object Second;
 264
 265                 public Pair (object f, object s)
 266                 {
 267                         First = f;
 268                         Second = s;
 269                 }
 270         }
 271 }