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
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
// devela::text::str::namespace::range
//
//! Implements range methods for [`Str`].
//
use crate::{Str, is, unwrap};
/// # `range*` API methods for returning substrings.
///
/// Similar to `Slice::`[`range*` API methods](crate::Slice#range-api-methods-for-subslicing)
impl Str {
// range
/// Returns a substring from `start` (inclusive) to `end` (exclusive).
///
/// Equivalent to `&string[start..end]`.
///
/// # Panics
/// Panics if `start` > `end` or `end` > `string.len()`
/// or if any split point falls outside a UTF-8 code point boundary.
#[must_use]
#[inline(always)]
pub const fn range(string: &str, start: usize, end: usize) -> &str {
string.split_at(start).1.split_at(end - start).0
}
/// Returns a substring from `start` (inclusive) to `end` (exclusive).
///
/// Equivalent to `&string[start..end]`.
///
/// Returns `None` if `start` > `end` or `end` > `string.len()`
/// or if any split point falls outside a UTF-8 code point boundary.
#[must_use]
#[inline(always)]
pub const fn range_checked(string: &str, start: usize, end: usize) -> Option<&str> {
Some(
unwrap![some?
unwrap![some? string.split_at_checked(start)].1
.split_at_checked(end - start)]
.0,
)
}
/// Returns an exclusive substring from `start` (inclusive) to `end` (exclusive).
///
/// Equivalent to `&mut string[start..end]`.
///
/// # Panics
/// Panics if `start` > `end` or `end` > `string.len()`
/// or if any split point falls outside a UTF-8 code point boundary.
#[must_use]
#[inline(always)]
pub const fn range_mut(string: &mut str, start: usize, end: usize) -> &mut str {
string.split_at_mut(start).1.split_at_mut(end - start).0
}
/// Returns an exclusive substring from `start` (inclusive) to `end` (exclusive).
///
/// Equivalent to `&mut string[start..end]`.
///
/// Returns `None` if `start` > `end` or `end` > `string.len()`
/// or if any split point falls outside a UTF-8 code point boundary.
#[must_use]
#[inline(always)]
pub const fn range_mut_checked(string: &mut str, start: usize, end: usize) -> Option<&mut str> {
Some(
unwrap![some?
unwrap![some? string.split_at_mut_checked(start)].1
.split_at_mut_checked(end - start)]
.0,
)
}
// range_inclusive
/// Returns a substring from `start` (inclusive) to `end` (inclusive).
///
/// Equivalent to `&string[start..=end]`.
///
/// # Panics
/// Panics if `start` > `end` or `end` >= `string.len()`
/// or if any split point falls outside a UTF-8 code point boundary.
#[must_use]
#[inline(always)]
pub const fn range_inclusive(string: &str, start: usize, end: usize) -> &str {
string.split_at(start).1.split_at(end - start + 1).0
}
/// Returns a substring from `start` (inclusive) to `end` (inclusive).
///
/// Equivalent to `&string[start..=end]`.
///
/// Returns `None` if `start` > `end` or `end` > `string.len()`
/// or if any split point falls outside a UTF-8 code point boundary.
#[must_use]
#[inline(always)]
pub const fn range_inclusive_checked(string: &str, start: usize, end: usize) -> Option<&str> {
Some(
unwrap![some?
unwrap![some? string.split_at_checked(start)].1
.split_at_checked(end - start + 1)]
.0,
)
}
/// Returns a substring from `start` (inclusive) to `end` (inclusive).
///
/// Equivalent to `&mut string[start..=end]`.
///
/// # Panics
/// Panics if `start` > `end` or `end` >= `string.len()`
/// or if any split point falls outside a UTF-8 code point boundary.
#[must_use]
#[inline(always)]
pub const fn range_inclusive_mut(string: &mut str, start: usize, end: usize) -> &mut str {
string.split_at_mut(start).1.split_at_mut(end - start + 1).0
}
/// Returns a substring from `start` (inclusive) to `end` (inclusive).
///
/// Equivalent to `&mut string[start..=end]`.
///
/// Returns `None` if `start` > `end` or `end` > `string.len()`
/// or if a split point falls outside a UTF-8 code point boundary.
#[must_use]
#[inline(always)]
pub const fn range_inclusive_mut_checked(
string: &mut str,
start: usize,
end: usize,
) -> Option<&mut str> {
Some(
unwrap![some?
unwrap![some? string.split_at_mut_checked(start)].1
.split_at_mut_checked(end - start + 1)]
.0,
)
}
// range_from
/// Returns a substring starting from the given `start` index.
///
/// Equivalent to `&string[start..]`.
///
/// # Panics
/// Panics if `start` > `string.len()`
/// or if the split point falls outside a UTF-8 code point boundary.
#[must_use]
#[inline(always)]
pub const fn range_from(string: &str, start: usize) -> &str {
string.split_at(start).1
}
/// Returns a substring starting from the given `start` index.
///
/// Equivalent to `&string[start..]`.
///
/// Returns `None` if `start` > `string.len()`
/// or if the split point falls outside a UTF-8 code point boundary.
#[must_use]
#[inline(always)]
pub const fn range_from_checked(string: &str, start: usize) -> Option<&str> {
match string.split_at_checked(start) {
Some((_, substring)) => Some(substring),
None => None,
}
}
/// Returns an exclusive substring starting from the given `start` index.
///
/// Equivalent to `&mut string[start..]`.
///
/// # Panics
/// Panics if `start` > `string.len()`
/// or if the split point falls outside a UTF-8 code point boundary.
#[must_use]
#[inline(always)]
pub const fn range_from_mut(string: &mut str, start: usize) -> &mut str {
string.split_at_mut(start).1
}
/// Returns an exclusive substring starting from the given `start` index.
///
/// Equivalent to `&mut string[start..]`.
///
/// Returns `None` if `start` > `string.len()`
/// or if the split point falls outside a UTF-8 code point boundary.
#[must_use]
#[inline(always)]
pub const fn range_from_mut_checked(string: &mut str, start: usize) -> Option<&mut str> {
match string.split_at_mut_checked(start) {
Some((_, substring)) => Some(substring),
None => None,
}
}
// range_to
/// Returns a substring up to the given `end` index.
///
/// Equivalent to `&string[..end]`.
///
/// # Panics
/// Panics if `end` > `string.len()`
/// or if the split point falls outside a UTF-8 code point boundary.
#[must_use]
#[inline(always)]
pub const fn range_to(string: &str, end: usize) -> &str {
string.split_at(end).0
}
/// Returns a substring up to the given `end` index.
///
/// Equivalent to `&string[..end]`.
///
/// Returns `None` if `end` > `string.len()`
/// or if the split point falls outside a UTF-8 code point boundary.
#[must_use]
#[inline(always)]
pub const fn range_to_checked(string: &str, end: usize) -> Option<&str> {
match string.split_at_checked(end) {
Some((substring, _)) => Some(substring),
None => None,
}
}
/// Returns an exclusive substring up to the given `end` index.
///
/// Equivalent to `&mut string[..end]`.
///
/// # Panics
/// Panics if `end` > `string.len()`
/// or if the split point falls outside a UTF-8 code point boundary.
#[must_use]
#[inline(always)]
pub const fn range_to_mut(string: &mut str, end: usize) -> &mut str {
string.split_at_mut(end).0
}
/// Returns an exclusive substring up to the given `end` index.
///
/// Equivalent to `&mut string[..end]`.
///
/// Returns `None` if `end` > `string.len()`
/// or if the split point falls outside a UTF-8 code point boundary.
#[must_use]
#[inline(always)]
pub const fn range_to_mut_checked(string: &mut str, end: usize) -> Option<&mut str> {
match string.split_at_mut_checked(end) {
Some((substring, _)) => Some(substring),
None => None,
}
}
// range_to_inclusive
/// Returns a substring up to and including the given `end` index.
///
/// Equivalent to `&string[..=end]`.
///
/// # Panics
/// Panics if `end` >= `string.len()`
/// or if the split point falls outside a UTF-8 code point boundary.
#[must_use]
#[inline(always)]
pub const fn range_to_inclusive(string: &str, end: usize) -> &str {
string.split_at(end + 1).0
}
/// Returns a substring up to and including the given `end` index.
///
/// Equivalent to `&string[..=end]`.
///
/// Returns `None` if `end` >= `string.len()`
/// or if the split point falls outside a UTF-8 code point boundary.
#[must_use]
#[inline(always)]
pub const fn range_to_inclusive_checked(string: &str, end: usize) -> Option<&str> {
is![end < string.len(), Some(string.split_at(end + 1).0), None]
}
/// Returns an exclusive substring up to and including the given `end` index.
///
/// Equivalent to `&string[..=end]`.
///
/// # Panics
/// Panics if `end` >= `string.len()`
/// or if the split point falls outside a UTF-8 code point boundary.
#[must_use]
#[inline(always)]
pub const fn range_to_inclusive_mut(string: &mut str, end: usize) -> &mut str {
string.split_at_mut(end + 1).0
}
/// Returns an exclusive substring up to and including the given `end` index.
///
/// Equivalent to `&string[..=end]`.
///
/// Returns `None` if `end` >= `string.len()`
/// or if the split point falls outside a UTF-8 code point boundary.
#[must_use]
#[inline(always)]
pub const fn range_to_inclusive_mut_checked(string: &mut str, end: usize) -> Option<&mut str> {
is![end < string.len(), Some(string.split_at_mut(end + 1).0), None]
}
}