1 // Copyright 2009 The RE2 Authors. All Rights Reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
4
5 #include <string>
6
7 #include "util/test.h"
8 #include "util/logging.h"
9 #include "re2/regexp.h"
10
11 namespace re2 {
12
13 struct PrefixTest {
14 const char* regexp;
15 bool return_value;
16 const char* prefix;
17 bool foldcase;
18 const char* suffix;
19 };
20
21 static PrefixTest tests[] = {
22 // If the regexp is missing a ^, there's no required prefix.
23 { "abc", false },
24 { "", false },
25 { "(?m)^", false },
26
27 // If the regexp immediately goes into
28 // something not a literal match, there's no required prefix.
29 { "^(abc)", false },
30 { "^a*", false },
31
32 // Otherwise, it should work.
33 { "^abc$", true, "abc", false, "(?-m:$)" },
34 { "^abc", true, "abc", false, "" },
35 { "^(?i)abc", true, "abc", true, "" },
36 { "^abcd*", true, "abc", false, "d*" },
37 { "^[Aa][Bb]cd*", true, "ab", true, "cd*" },
38 { "^ab[Cc]d*", true, "ab", false, "[Cc]d*" },
39 { "^☺abc", true, "☺abc", false, "" },
40 };
41
TEST(RequiredPrefix,SimpleTests)42 TEST(RequiredPrefix, SimpleTests) {
43 for (int i = 0; i < arraysize(tests); i++) {
44 const PrefixTest& t = tests[i];
45 for (int j = 0; j < 2; j++) {
46 Regexp::ParseFlags flags = Regexp::LikePerl;
47 if (j == 0)
48 flags = flags | Regexp::Latin1;
49 Regexp* re = Regexp::Parse(t.regexp, flags, NULL);
50 ASSERT_TRUE(re != NULL) << " " << t.regexp;
51
52 string p;
53 bool f;
54 Regexp* s;
55 ASSERT_EQ(t.return_value, re->RequiredPrefix(&p, &f, &s))
56 << " " << t.regexp << " " << (j==0 ? "latin1" : "utf")
57 << " " << re->Dump();
58 if (t.return_value) {
59 ASSERT_EQ(p, string(t.prefix))
60 << " " << t.regexp << " " << (j==0 ? "latin1" : "utf");
61 ASSERT_EQ(f, t.foldcase)
62 << " " << t.regexp << " " << (j==0 ? "latin1" : "utf");
63 ASSERT_EQ(s->ToString(), string(t.suffix))
64 << " " << t.regexp << " " << (j==0 ? "latin1" : "utf");
65 s->Decref();
66 }
67 re->Decref();
68 }
69 }
70 }
71
72 } // namespace re2
73