logo
  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
use const_fn::const_fn;
use core::fmt::{self, Display};
#[cfg(feature = "serde")]
use standback::convert::TryInto;
use Weekday::*;

/// Days of the week.
///
/// As order is dependent on context (Sunday could be either
/// two days after or five days before Friday), this type does not implement
/// `PartialOrd` or `Ord`.
#[cfg_attr(feature = "serde", derive(serde::Serialize))]
#[cfg_attr(feature = "serde", serde(into = "crate::serde::Weekday"))]
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum Weekday {
    #[allow(clippy::missing_docs_in_private_items)]
    Monday,
    #[allow(clippy::missing_docs_in_private_items)]
    Tuesday,
    #[allow(clippy::missing_docs_in_private_items)]
    Wednesday,
    #[allow(clippy::missing_docs_in_private_items)]
    Thursday,
    #[allow(clippy::missing_docs_in_private_items)]
    Friday,
    #[allow(clippy::missing_docs_in_private_items)]
    Saturday,
    #[allow(clippy::missing_docs_in_private_items)]
    Sunday,
}

#[cfg(feature = "serde")]
impl<'a> serde::Deserialize<'a> for Weekday {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: serde::Deserializer<'a>,
    {
        crate::serde::Weekday::deserialize(deserializer)?
            .try_into()
            .map_err(serde::de::Error::custom)
    }
}

impl Weekday {
    /// Get the previous weekday.
    ///
    /// ```rust
    /// # use time::Weekday;
    /// assert_eq!(Weekday::Tuesday.previous(), Weekday::Monday);
    /// ```
    ///
    /// This function is `const fn` when using rustc >= 1.46.
    #[const_fn("1.46")]
    pub const fn previous(self) -> Self {
        match self {
            Monday => Sunday,
            Tuesday => Monday,
            Wednesday => Tuesday,
            Thursday => Wednesday,
            Friday => Thursday,
            Saturday => Friday,
            Sunday => Saturday,
        }
    }

    /// Get the next weekday.
    ///
    /// ```rust
    /// # use time::Weekday;
    /// assert_eq!(Weekday::Monday.next(), Weekday::Tuesday);
    /// ```
    ///
    /// This function is `const fn` when using rustc >= 1.46.
    #[const_fn("1.46")]
    pub const fn next(self) -> Self {
        match self {
            Monday => Tuesday,
            Tuesday => Wednesday,
            Wednesday => Thursday,
            Thursday => Friday,
            Friday => Saturday,
            Saturday => Sunday,
            Sunday => Monday,
        }
    }

    /// Get the ISO 8601 weekday number. Equivalent to
    /// [`Weekday::number_from_monday`].
    ///
    /// ```rust
    /// # use time::Weekday;
    /// assert_eq!(Weekday::Monday.iso_weekday_number(), 1);
    /// ```
    pub const fn iso_weekday_number(self) -> u8 {
        self.number_from_monday()
    }

    /// Get the one-indexed number of days from Monday.
    ///
    /// ```rust
    /// # use time::Weekday;
    /// assert_eq!(Weekday::Monday.number_from_monday(), 1);
    /// ```
    pub const fn number_from_monday(self) -> u8 {
        self.number_days_from_monday() + 1
    }

    /// Get the one-indexed number of days from Sunday.
    ///
    /// ```rust
    /// # use time::Weekday;
    /// assert_eq!(Weekday::Monday.number_from_sunday(), 2);
    /// ```
    pub const fn number_from_sunday(self) -> u8 {
        self.number_days_from_sunday() + 1
    }

    /// Get the zero-indexed number of days from Monday.
    ///
    /// ```rust
    /// # use time::Weekday;
    /// assert_eq!(Weekday::Monday.number_days_from_monday(), 0);
    /// ```
    pub const fn number_days_from_monday(self) -> u8 {
        self as u8
    }

    /// Get the zero-indexed number of days from Sunday.
    ///
    /// ```rust
    /// # use time::Weekday;
    /// assert_eq!(Weekday::Monday.number_days_from_sunday(), 1);
    /// ```
    pub const fn number_days_from_sunday(self) -> u8 {
        (self as u8 + 1) % 7
    }
}

impl Display for Weekday {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.write_str(match self {
            Monday => "Monday",
            Tuesday => "Tuesday",
            Wednesday => "Wednesday",
            Thursday => "Thursday",
            Friday => "Friday",
            Saturday => "Saturday",
            Sunday => "Sunday",
        })
    }
}