1
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5
6 using System;
7 using System.Collections;
8
9 namespace System.Ascii
10 {
11 public enum CharClass : ushort
12 {
13 none = 0u,
14 lower = 1u << 0u,
15 upper = 1u << 1u,
16 alpha = lower | upper,
17 digit = 1u << 2u,
18 alnum = alpha | digit,
19 xdigit = 1u << 3u,
20 cntrl = 1u << 4u,
21 graph = 1u << 5u,
22 print = 1u << 6u,
23 punct = 1u << 7u,
24 space = 1u << 8u
25 }
26
27 public class CharClassTable
28 {
29 static CharClassTable() : instance(new CharClassTable())
30 {
31 }
32 public static CharClassTable& Instance()
33 {
34 return *instance;
35 }
36 public inline CharClass GetCharacterClass(char c)
37 {
38 return table[cast<byte>(c)];
39 }
40 private CharClassTable()
41 {
42 SetCharacterClass(cast<byte>('a'), cast<byte>('z'), CharClass.lower);
43 SetCharacterClass(cast<byte>('A'), cast<byte>('Z'), CharClass.upper);
44 SetCharacterClass(cast<byte>('0'), cast<byte>('9'), CharClass.digit);
45 SetCharacterClass(cast<byte>('0'), cast<byte>('9'), CharClass.xdigit);
46 SetCharacterClass(cast<byte>('a'), cast<byte>('f'), CharClass.xdigit);
47 SetCharacterClass(cast<byte>('A'), cast<byte>('F'), CharClass.xdigit);
48 SetCharacterClass(0u, 31u, CharClass.cntrl);
49 SetCharacterClass(127u, 127u, CharClass.cntrl);
50 SetCharacterClass(33u, 126u, CharClass.graph);
51 SetCharacterClass(32u, 126u, CharClass.print);
52 SetCharacterClass(33u, 47u, CharClass.punct);
53 SetCharacterClass(58u, 64u, CharClass.punct);
54 SetCharacterClass(91u, 96u, CharClass.punct);
55 SetCharacterClass(123u, 126u, CharClass.punct);
56 SetCharacterClass(9u, 13u, CharClass.space);
57 SetCharacterClass(32u, 32u, CharClass.space);
58 }
59 private void SetCharacterClass(byte first, byte last, CharClass c)
60 {
61 for (byte i = first; i <= last; ++i;)
62 {
63 table[i] = cast<CharClass>(table[i] | c);
64 }
65 }
66 private static UniquePtr<CharClassTable> instance;
67 private CharClass[256] table;
68 }