blob: bb5c79634debc759f9014cc8ec0ee717de7e5b08 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
|
#include "pcre2pire.h"
#include <util/generic/vector.h>
#include <util/generic/yexception.h>
TString Pcre2Pire(const TString& src) {
TVector<char> result;
result.reserve(src.size() + 1);
enum EState {
S_SIMPLE,
S_SLASH,
S_BRACE,
S_EXPECT_Q,
S_QUESTION,
S_P,
S_COMMA,
S_IN,
};
EState state = S_SIMPLE;
for (ui32 i = 0; i < src.size(); ++i) {
const char c = src[i];
switch (state) {
case S_SIMPLE:
if (c == '\\') {
state = S_SLASH;
} else if (c == '(') {
state = S_BRACE;
} else if (c == '*' || c == '?') {
state = S_EXPECT_Q;
result.push_back(c);
} else {
if (c == ')' && result.size() > 0 && result.back() == '(') {
// eliminating "()"
result.pop_back();
} else {
result.push_back(c);
}
}
break;
case S_SLASH:
state = S_SIMPLE;
if (c == ':' || c == '=' || c == '#' || c == '&') {
result.push_back(c);
} else {
result.push_back('\\');
--i;
}
break;
case S_BRACE:
if (c == '?') {
state = S_QUESTION;
} else {
state = S_COMMA;
--i;
}
break;
case S_EXPECT_Q:
state = S_SIMPLE;
if (c != '?') {
--i;
}
break;
case S_QUESTION:
if (c == 'P') {
state = S_P;
} else if (c == ':' || c == '=') {
state = S_COMMA;
} else {
ythrow yexception() << "Pcre to pire convertaion failed: unexpected symbol '" << c << "' at posiotion " << i << "!";
}
break;
case S_P:
if (c == '<') {
state = S_IN;
} else {
ythrow yexception() << "Pcre to pire convertaion failed: unexpected symbol '" << c << "' at posiotion " << i << "!";
}
break;
case S_IN:
if (c == '>') {
state = S_COMMA;
} else {
// nothing to do
}
break;
case S_COMMA:
state = S_SIMPLE;
if (c == ')') {
// nothing to do
} else {
result.push_back('(');
--i;
}
break;
default:
ythrow yexception() << "Pcre to pire convertaion failed: unexpected automata state!";
}
}
if (state != S_SIMPLE && state != S_EXPECT_Q) {
ythrow yexception() << "Pcre to pire convertaion failed: unexpected end of expression!";
}
result.push_back('\0');
return &result[0];
}
|
