1 using System;
 2 using System.IO;
 3 using System.Collections;
 4 using System.RegularExpressions;
 5 
 6 void PrintHelp()
 7 {
 8     Console.Out() << "Usage: sgrep \"PATTERN\" FILES..." << endl();
 9 }
10 
11 int main(int argc, const char** argv)
12 {
13     try
14     {
15         ustring pattern;
16         List<string> fileNames;
17         for (int i = 1; i < argc; ++i;)
18         {
19             string arg = argv[i];
20             if (arg.StartsWith("--"))
21             {
22                 if (arg == "--help")
23                 {
24                     PrintHelp();
25                     return 1;
26                 }
27                 else
28                 {
29                     throw Exception("unknown option '" + arg + "'");
30                 }
31             }
32             else if (arg.StartsWith("-"))
33             {
34                 for (char o : arg)
35                 {
36                     if (o == 'h')
37                     {
38                         PrintHelp();
39                         return 1;
40                     }
41                     else
42                     {
43                         throw Exception("unknown option '-" + string(o) + "'");
44                     }
45                 }
46             }
47             else
48             {
49                 if (pattern.IsEmpty())
50                 {
51                     pattern = u".*" + ToUtf32(arg) + u".*";
52                 }
53                 else
54                 {
55                     fileNames.Add(arg);
56                 }
57             }
58         }
59         Context context;
60         Nfa nfa = CompileRegularExpressionPattern(context, pattern);
61         for (const string& fileName : fileNames)
62         {
63             Console.Out() << fileName << ":" << endl();
64             List<string> lines = File.ReadAllLines(fileName);
65             long n = lines.Count();
66             for (long i = 0; i < n; ++i;)
67             {
68                 ustring line = ToUtf32(lines[i]);
69                 if (PatternMatch(line, nfa))
70                 {
71                     Console.Out() << ToString(i + 1) << ": " << line << endl();
72                 }
73             }
74         }
75     }
76     catch (const Exception& ex)
77     {
78         Console.Error() << ex.Message() << endl();
79         return 1;
80     }
81     return 0;
82 }