1use core::fmt;
4use core::str::FromStr;
5
6use powerfmt::smart_display::{FormatterOptions, Metadata, SmartDisplay};
7
8use self::Weekday::*;
9use crate::error;
10
11#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
16pub enum Weekday {
17 #[expect(missing_docs)]
18 Monday,
19 #[expect(missing_docs)]
20 Tuesday,
21 #[expect(missing_docs)]
22 Wednesday,
23 #[expect(missing_docs)]
24 Thursday,
25 #[expect(missing_docs)]
26 Friday,
27 #[expect(missing_docs)]
28 Saturday,
29 #[expect(missing_docs)]
30 Sunday,
31}
32
33impl Weekday {
34 #[inline]
41 pub const fn previous(self) -> Self {
42 match self {
43 Monday => Sunday,
44 Tuesday => Monday,
45 Wednesday => Tuesday,
46 Thursday => Wednesday,
47 Friday => Thursday,
48 Saturday => Friday,
49 Sunday => Saturday,
50 }
51 }
52
53 #[inline]
60 pub const fn next(self) -> Self {
61 match self {
62 Monday => Tuesday,
63 Tuesday => Wednesday,
64 Wednesday => Thursday,
65 Thursday => Friday,
66 Friday => Saturday,
67 Saturday => Sunday,
68 Sunday => Monday,
69 }
70 }
71
72 #[inline]
80 pub const fn nth_next(self, n: u8) -> Self {
81 match (self.number_days_from_monday() + n % 7) % 7 {
82 0 => Monday,
83 1 => Tuesday,
84 2 => Wednesday,
85 3 => Thursday,
86 4 => Friday,
87 5 => Saturday,
88 val => {
89 debug_assert!(val == 6);
90 Sunday
91 }
92 }
93 }
94
95 #[inline]
103 pub const fn nth_prev(self, n: u8) -> Self {
104 match self.number_days_from_monday() as i8 - (n % 7) as i8 {
105 1 | -6 => Tuesday,
106 2 | -5 => Wednesday,
107 3 | -4 => Thursday,
108 4 | -3 => Friday,
109 5 | -2 => Saturday,
110 6 | -1 => Sunday,
111 val => {
112 debug_assert!(val == 0);
113 Monday
114 }
115 }
116 }
117
118 #[doc(alias = "iso_weekday_number")]
125 #[inline]
126 pub const fn number_from_monday(self) -> u8 {
127 self.number_days_from_monday() + 1
128 }
129
130 #[inline]
137 pub const fn number_from_sunday(self) -> u8 {
138 self.number_days_from_sunday() + 1
139 }
140
141 #[inline]
148 pub const fn number_days_from_monday(self) -> u8 {
149 self as u8
150 }
151
152 #[inline]
159 pub const fn number_days_from_sunday(self) -> u8 {
160 match self {
161 Monday => 1,
162 Tuesday => 2,
163 Wednesday => 3,
164 Thursday => 4,
165 Friday => 5,
166 Saturday => 6,
167 Sunday => 0,
168 }
169 }
170}
171
172mod private {
173 #[non_exhaustive]
174 #[derive(Debug, Clone, Copy)]
175 pub struct WeekdayMetadata;
176}
177use private::WeekdayMetadata;
178
179impl SmartDisplay for Weekday {
180 type Metadata = WeekdayMetadata;
181
182 #[inline]
183 fn metadata(&self, _: FormatterOptions) -> Metadata<'_, Self> {
184 match self {
185 Monday => Metadata::new(6, self, WeekdayMetadata),
186 Tuesday => Metadata::new(7, self, WeekdayMetadata),
187 Wednesday => Metadata::new(9, self, WeekdayMetadata),
188 Thursday => Metadata::new(8, self, WeekdayMetadata),
189 Friday => Metadata::new(6, self, WeekdayMetadata),
190 Saturday => Metadata::new(8, self, WeekdayMetadata),
191 Sunday => Metadata::new(6, self, WeekdayMetadata),
192 }
193 }
194
195 #[inline]
196 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
197 f.pad(match self {
198 Monday => "Monday",
199 Tuesday => "Tuesday",
200 Wednesday => "Wednesday",
201 Thursday => "Thursday",
202 Friday => "Friday",
203 Saturday => "Saturday",
204 Sunday => "Sunday",
205 })
206 }
207}
208
209impl fmt::Display for Weekday {
210 #[inline]
211 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
212 SmartDisplay::fmt(self, f)
213 }
214}
215
216impl FromStr for Weekday {
217 type Err = error::InvalidVariant;
218
219 #[inline]
220 fn from_str(s: &str) -> Result<Self, Self::Err> {
221 match s {
222 "Monday" => Ok(Monday),
223 "Tuesday" => Ok(Tuesday),
224 "Wednesday" => Ok(Wednesday),
225 "Thursday" => Ok(Thursday),
226 "Friday" => Ok(Friday),
227 "Saturday" => Ok(Saturday),
228 "Sunday" => Ok(Sunday),
229 _ => Err(error::InvalidVariant),
230 }
231 }
232}