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
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
#include "clar_libgit2.h"
#include "git2/sys/hashsig.h"
#include "futils.h"
#define SIMILARITY_TEST_DATA_1 \
"000\n001\n002\n003\n004\n005\n006\n007\n008\n009\n" \
"010\n011\n012\n013\n014\n015\n016\n017\n018\n019\n" \
"020\n021\n022\n023\n024\n025\n026\n027\n028\n029\n" \
"030\n031\n032\n033\n034\n035\n036\n037\n038\n039\n" \
"040\n041\n042\n043\n044\n045\n046\n047\n048\n049\n"
void test_core_hashsig__similarity_metric(void)
{
git_hashsig *a, *b;
git_str buf = GIT_STR_INIT;
int sim;
/* in the first case, we compare data to itself and expect 100% match */
cl_git_pass(git_str_sets(&buf, SIMILARITY_TEST_DATA_1));
cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
cl_git_pass(git_hashsig_create(&b, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
cl_assert_equal_i(100, git_hashsig_compare(a, b));
git_hashsig_free(a);
git_hashsig_free(b);
/* if we change just a single byte, how much does that change magnify? */
cl_git_pass(git_str_sets(&buf, SIMILARITY_TEST_DATA_1));
cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
cl_git_pass(git_str_sets(&buf,
"000\n001\n002\n003\n004\n005\n006\n007\n008\n009\n" \
"010\n011\n012\n013\n014\n015\n016\n017\n018\n019\n" \
"x020x\n021\n022\n023\n024\n025\n026\n027\n028\n029\n" \
"030\n031\n032\n033\n034\n035\n036\n037\n038\n039\n" \
"040\n041\n042\n043\n044\n045\n046\n047\n048\n049\n"
));
cl_git_pass(git_hashsig_create(&b, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
sim = git_hashsig_compare(a, b);
cl_assert_in_range(95, sim, 100); /* expect >95% similarity */
git_hashsig_free(a);
git_hashsig_free(b);
/* let's try comparing data to a superset of itself */
cl_git_pass(git_str_sets(&buf, SIMILARITY_TEST_DATA_1));
cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
cl_git_pass(git_str_sets(&buf, SIMILARITY_TEST_DATA_1
"050\n051\n052\n053\n054\n055\n056\n057\n058\n059\n"));
cl_git_pass(git_hashsig_create(&b, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
sim = git_hashsig_compare(a, b);
/* 20% lines added ~= 10% lines changed */
cl_assert_in_range(85, sim, 95); /* expect similarity around 90% */
git_hashsig_free(a);
git_hashsig_free(b);
/* what if we keep about half the original data and add half new */
cl_git_pass(git_str_sets(&buf, SIMILARITY_TEST_DATA_1));
cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
cl_git_pass(git_str_sets(&buf,
"000\n001\n002\n003\n004\n005\n006\n007\n008\n009\n" \
"010\n011\n012\n013\n014\n015\n016\n017\n018\n019\n" \
"020x\n021\n022\n023\n024\n" \
"x25\nx26\nx27\nx28\nx29\n" \
"x30\nx31\nx32\nx33\nx34\nx35\nx36\nx37\nx38\nx39\n" \
"x40\nx41\nx42\nx43\nx44\nx45\nx46\nx47\nx48\nx49\n"
));
cl_git_pass(git_hashsig_create(&b, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
sim = git_hashsig_compare(a, b);
/* 50% lines changed */
cl_assert_in_range(40, sim, 60); /* expect in the 40-60% similarity range */
git_hashsig_free(a);
git_hashsig_free(b);
/* lastly, let's check that we can hash file content as well */
cl_git_pass(git_str_sets(&buf, SIMILARITY_TEST_DATA_1));
cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
cl_git_pass(git_futils_mkdir("scratch", 0755, GIT_MKDIR_PATH));
cl_git_mkfile("scratch/testdata", SIMILARITY_TEST_DATA_1);
cl_git_pass(git_hashsig_create_fromfile(
&b, "scratch/testdata", GIT_HASHSIG_NORMAL));
cl_assert_equal_i(100, git_hashsig_compare(a, b));
git_hashsig_free(a);
git_hashsig_free(b);
git_str_dispose(&buf);
git_futils_rmdir_r("scratch", NULL, GIT_RMDIR_REMOVE_FILES);
}
void test_core_hashsig__similarity_metric_whitespace(void)
{
git_hashsig *a, *b;
git_str buf = GIT_STR_INIT;
int sim, i, j;
git_hashsig_option_t opt;
const char *tabbed =
" for (s = 0; s < sizeof(sep) / sizeof(char); ++s) {\n"
" separator = sep[s];\n"
" expect = expect_values[s];\n"
"\n"
" for (j = 0; j < sizeof(b) / sizeof(char*); ++j) {\n"
" for (i = 0; i < sizeof(a) / sizeof(char*); ++i) {\n"
" git_str_join(&buf, separator, a[i], b[j]);\n"
" cl_assert_equal_s(*expect, buf.ptr);\n"
" expect++;\n"
" }\n"
" }\n"
" }\n";
const char *spaced =
" for (s = 0; s < sizeof(sep) / sizeof(char); ++s) {\n"
" separator = sep[s];\n"
" expect = expect_values[s];\n"
"\n"
" for (j = 0; j < sizeof(b) / sizeof(char*); ++j) {\n"
" for (i = 0; i < sizeof(a) / sizeof(char*); ++i) {\n"
" git_str_join(&buf, separator, a[i], b[j]);\n"
" cl_assert_equal_s(*expect, buf.ptr);\n"
" expect++;\n"
" }\n"
" }\n"
" }\n";
const char *crlf_spaced2 =
" for (s = 0; s < sizeof(sep) / sizeof(char); ++s) {\r\n"
" separator = sep[s];\r\n"
" expect = expect_values[s];\r\n"
"\r\n"
" for (j = 0; j < sizeof(b) / sizeof(char*); ++j) {\r\n"
" for (i = 0; i < sizeof(a) / sizeof(char*); ++i) {\r\n"
" git_str_join(&buf, separator, a[i], b[j]);\r\n"
" cl_assert_equal_s(*expect, buf.ptr);\r\n"
" expect++;\r\n"
" }\r\n"
" }\r\n"
" }\r\n";
const char *text[3] = { tabbed, spaced, crlf_spaced2 };
/* let's try variations of our own code with whitespace changes */
for (opt = GIT_HASHSIG_NORMAL; opt <= GIT_HASHSIG_SMART_WHITESPACE; ++opt) {
for (i = 0; i < 3; ++i) {
for (j = 0; j < 3; ++j) {
cl_git_pass(git_str_sets(&buf, text[i]));
cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, opt));
cl_git_pass(git_str_sets(&buf, text[j]));
cl_git_pass(git_hashsig_create(&b, buf.ptr, buf.size, opt));
sim = git_hashsig_compare(a, b);
if (opt == GIT_HASHSIG_NORMAL) {
if (i == j)
cl_assert_equal_i(100, sim);
else
cl_assert_in_range(0, sim, 30); /* pretty different */
} else {
cl_assert_equal_i(100, sim);
}
git_hashsig_free(a);
git_hashsig_free(b);
}
}
}
git_str_dispose(&buf);
}
|
