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
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
|
#include "string.hh"
#include "exception.hh"
#include "utils.hh"
#include "utf8_iterator.hh"
namespace Kakoune
{
bool operator<(StringView lhs, StringView rhs)
{
int cmp = strncmp(lhs.data(), rhs.data(), (int)std::min(lhs.length(), rhs.length()));
if (cmp == 0)
return lhs.length() < rhs.length();
return cmp < 0;
}
std::vector<String> split(StringView str, char separator, char escape)
{
std::vector<String> res;
auto it = str.begin();
while (it != str.end())
{
res.emplace_back();
String& element = res.back();
while (it != str.end())
{
auto c = *it;
if (c == escape and it + 1 != str.end() and *(it+1) == separator)
{
element += separator;
it += 2;
}
else if (c == separator)
{
++it;
break;
}
else
{
element += c;
++it;
}
}
}
return res;
}
std::vector<StringView> split(StringView str, char separator)
{
std::vector<StringView> res;
auto beg = str.begin();
for (auto it = beg; it != str.end(); ++it)
{
if (*it == separator)
{
res.emplace_back(beg, it);
beg = it + 1;
}
}
res.emplace_back(beg, str.end());
return res;
}
String escape(StringView str, StringView characters, char escape)
{
String res;
for (auto& c : str)
{
if (contains(characters, c))
res += escape;
res += c;
}
return res;
}
String unescape(StringView str, StringView characters, char escape)
{
String res;
for (auto& c : str)
{
if (contains(characters, c) and not res.empty() and res.back() == escape)
res.back() = c;
else
res += c;
}
return res;
}
int str_to_int(StringView str)
{
int res = 0;
if (sscanf(str.zstr(), "%i", &res) != 1)
throw runtime_error(str + "is not a number");
return res;
}
String to_string(int val)
{
char buf[16];
sprintf(buf, "%i", val);
return buf;
}
bool prefix_match(StringView str, StringView prefix)
{
auto it = str.begin();
for (auto& c : prefix)
{
if (it ==str.end() or *it++ != c)
return false;
}
return true;
}
bool subsequence_match(StringView str, StringView subseq)
{
auto it = str.begin();
for (auto& c : subseq)
{
if (it == str.end())
return false;
while (*it != c)
{
if (++it == str.end())
return false;
}
++it;
}
return true;
}
String expand_tabs(StringView line, CharCount tabstop, CharCount col)
{
String res;
using Utf8It = utf8::iterator<const char*>;
for (Utf8It it = line.begin(); it.base() < line.end(); ++it)
{
if (*it == '\t')
{
CharCount end_col = (col / tabstop + 1) * tabstop;
res += String{' ', end_col - col};
}
else
res += *it;
}
return res;
}
std::vector<StringView> wrap_lines(StringView text, CharCount max_width)
{
using Utf8It = utf8::iterator<const char*>;
Utf8It word_begin{text.begin()};
Utf8It word_end{word_begin};
Utf8It end{text.end()};
CharCount col = 0;
std::vector<StringView> lines;
Utf8It line_begin = text.begin();
Utf8It line_end = line_begin;
while (word_begin != end)
{
const CharCategories cat = categorize(*word_begin);
do
{
++word_end;
} while (word_end != end and categorize(*word_end) == cat);
col += word_end - word_begin;
if ((word_begin != line_begin and col > max_width) or
cat == CharCategories::EndOfLine)
{
lines.emplace_back(line_begin.base(), line_end.base());
line_begin = (cat == CharCategories::EndOfLine or
cat == CharCategories::Blank) ? word_end : word_begin;
col = word_end - line_begin;
}
if (cat == CharCategories::Word or cat == CharCategories::Punctuation)
line_end = word_end;
word_begin = word_end;
}
if (line_begin != word_begin)
lines.emplace_back(line_begin.base(), word_begin.base());
return lines;
}
[[gnu::always_inline]]
static inline uint32_t rotl(uint32_t x, int8_t r)
{
return (x << r) | (x >> (32 - r));
}
[[gnu::always_inline]]
static inline uint32_t fmix(uint32_t h)
{
h ^= h >> 16;
h *= 0x85ebca6b;
h ^= h >> 13;
h *= 0xc2b2ae35;
h ^= h >> 16;
return h;
}
// murmur3 hash, based on https://github.com/PeterScott/murmur3
size_t hash_data(const char* input, size_t len)
{
const uint8_t* data = reinterpret_cast<const uint8_t*>(input);
uint32_t hash = 0x1235678;
constexpr uint32_t c1 = 0xcc9e2d51;
constexpr uint32_t c2 = 0x1b873593;
const int nblocks = len / 4;
const uint32_t* blocks = reinterpret_cast<const uint32_t*>(data + nblocks*4);
for (int i = -nblocks; i; ++i)
{
uint32_t key = blocks[i];
key *= c1;
key = rotl(key, 15);
key *= c2;
hash ^= key;
hash = rotl(hash, 13);
hash = hash * 5 + 0xe6546b64;
}
const uint8_t* tail = data + nblocks * 4;
uint32_t key = 0;
switch (len & 3)
{
case 3: key ^= tail[2] << 16;
case 2: key ^= tail[1] << 8;
case 1: key ^= tail[0];
key *= c1;
key = rotl(key,15);
key *= c2;
hash ^= key;
}
hash ^= len;
hash = fmix(hash);
return hash;
}
}
|
