2 // modifiers.cs: Modifier handling.
5 using System.Reflection;
8 public class Modifiers {
11 // The ordering of the following 4 constants
12 // has been carefully done.
14 public const int PROTECTED = 0x0001;
15 public const int PUBLIC = 0x0002;
16 public const int PRIVATE = 0x0004;
17 public const int INTERNAL = 0x0008;
18 public const int NEW = 0x0010;
19 public const int ABSTRACT = 0x0020;
20 public const int SEALED = 0x0040;
21 public const int STATIC = 0x0080;
22 public const int READONLY = 0x0100;
23 public const int VIRTUAL = 0x0200;
24 public const int OVERRIDE = 0x0400;
25 public const int EXTERN = 0x0800;
26 public const int TOP = 0x0800;
28 public const int Accessibility =
29 PUBLIC | PROTECTED | INTERNAL | PRIVATE;
31 static public string Name (int i)
38 case Modifiers.PUBLIC:
40 case Modifiers.PROTECTED:
41 s = "protected"; break;
42 case Modifiers.INTERNAL:
43 s = "internal"; break;
44 case Modifiers.PRIVATE:
46 case Modifiers.ABSTRACT:
47 s = "abstract"; break;
48 case Modifiers.SEALED:
50 case Modifiers.STATIC:
52 case Modifiers.READONLY:
53 s = "readonly"; break;
54 case Modifiers.VIRTUAL:
56 case Modifiers.OVERRIDE:
57 s = "override"; break;
58 case Modifiers.EXTERN:
65 public static TypeAttributes TypeAttr (int mod_flags)
69 if ((mod_flags & PUBLIC) != 0)
70 t |= TypeAttributes.Public;
72 // FIXME: implement all flags
77 public static FieldAttributes FieldAttr (int mod_flags)
79 FieldAttributes fa = 0;
81 if ((mod_flags & Modifiers.PUBLIC) != 0)
82 fa |= FieldAttributes.Public;
83 if ((mod_flags & Modifiers.PRIVATE) != 0)
84 fa |= FieldAttributes.Private;
85 if ((mod_flags & Modifiers.STATIC) != 0)
86 fa |= FieldAttributes.Static;
87 if ((mod_flags & Modifiers.READONLY) != 0)
88 fa |= FieldAttributes.InitOnly;
93 public static MethodAttributes MethodAttr (int mod_flags)
95 MethodAttributes ma = 0;
97 if ((mod_flags & Modifiers.PUBLIC) != 0)
98 ma |= MethodAttributes.Public;
99 if ((mod_flags & Modifiers.PRIVATE) != 0)
100 ma |= MethodAttributes.Private;
101 if ((mod_flags & Modifiers.STATIC) != 0)
102 ma |= MethodAttributes.Static;
103 if ((mod_flags & Modifiers.ABSTRACT) != 0)
104 ma |= MethodAttributes.Abstract;
105 if ((mod_flags & Modifiers.SEALED) != 0)
106 ma |= MethodAttributes.Final;
107 if ((mod_flags & Modifiers.VIRTUAL) != 0)
108 ma |= MethodAttributes.Virtual;
114 // Checks the object @mod modifiers to be in @allowed.
115 // Returns the new mask. Side effect: reports any
116 // incorrect attributes.
118 public static int Check (int allowed, int mod, int def_access)
120 int invalid_flags = (~allowed) & mod;
123 if (invalid_flags == 0){
127 // If no accessibility bits provided
128 // then provide the defaults.
130 if ((mod & Accessibility) == 0){
136 // Make sure that no conflicting accessibility
137 // bits have been set. Protected+Internal is
138 // allowed, that is why they are placed on bits
139 // 1 and 4 (so the shift 3 basically merges them)
143 a = ((a & 2) >> 1) + (a & 5);
144 a = ((a & 4) >> 2) + (a & 3);
146 CSharpParser.error (107, "More than one protecion modifier specified");
151 for (i = 1; i < TOP; i <<= 1){
152 if ((i & invalid_flags) == 0)
155 CSharpParser.error (106, "the modifier `" + Name (i) + "' is not valid for this item");
158 return allowed & mod;