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Initial import.
author aziz
date Mon, 28 May 2007 19:03:02 +0000
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children f3cd3bfde4ba
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-1:000000000000 0:8ba2570de175
1 /++
2 Author: Aziz Köksal
3 License: GPL2
4 +/
5 module Lexer;
6
7 /// ASCII character properties table.
8 static const int ptable[256];
9
10 enum CProperty
11 {
12 Octal = 1
13 Digit = 1<<1,
14 Hex = 1<<2,
15 Alpha = 1<<3,
16 Identifier = 1<<4
17 }
18
19 int isoctal(char c) { return ptable[c] & CProperty.Octal; }
20 int isdigit(char c) { return ptable[c] & CProperty.Digit; }
21 int ishexad(char c) { return ptable[c] & CProperty.Hex; }
22 int isalpha(char c) { return ptable[c] & CProperty.Alpha; }
23 int isalnum(char c) { return ptable[c] & (CProperty.Alpha | CProperty.Digit); }
24 int isident(char c) { return ptable[c] & CProperty.Identifier; }
25
26 static this()
27 {
28 for (int i; i < ptable.length; ++i)
29 {
30 if ('0' <= i && i <= '7')
31 ptable[i] |= CProperty.Octal;
32 if ('0' <= i && i <= '9')
33 ptable[i] |= CProperty.Digit;
34 if (isdigit(i) || 'a' <= i && i <= 'f' || 'A' <= i && i <= 'F')
35 ptable[i] |= CProperty.Hex;
36 if ('a' <= i && i <= 'z' || 'A' <= i && i <= 'Z')
37 ptable[i] |= CProperty.Alpha;
38 if (isalnum(i) || i == '_')
39 ptable[i] |= Property.Identifier;
40 }
41 }
42
43 class Lexer
44 {
45
46 }