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use crate::ByteError;
use alloc::fmt::{self, Display, Formatter};
use alloc::str::FromStr;
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
/// The unit of bytes.
pub enum ByteUnit {
/// 1 B = 1 byte
B,
/// 1 KB = 1000 bytes
KB,
/// 1 KiB = 1024 bytes
KiB,
/// 1 MB = 1000000 bytes
MB,
/// 1 MiB = 1048576 bytes
MiB,
/// 1 GB = 1000000000 bytes
GB,
/// 1 GiB = 1073741824 bytes
GiB,
/// 1 TB = 1000000000000 bytes
TB,
/// 1 TiB = 1099511627776 bytes
TiB,
/// 1 PB = 1000000000000000 bytes
PB,
/// 1 PiB = 1125899906842624 bytes
PiB,
}
impl Display for ByteUnit {
#[inline]
fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> {
f.write_str(self.as_ref())
}
}
impl AsRef<str> for ByteUnit {
#[inline]
fn as_ref(&self) -> &str {
self.as_str()
}
}
impl FromStr for ByteUnit {
type Err = ByteError;
#[inline]
fn from_str(s: &str) -> Result<Self, Self::Err> {
ByteUnit::from_str(s)
}
}
impl ByteUnit {
/// Get an instance of `ByteUnit` from a string slice.
///
/// ```
/// extern crate byte_unit;
///
/// use byte_unit::ByteUnit;
///
/// assert_eq!(ByteUnit::B, ByteUnit::from_str("").unwrap());
/// assert_eq!(ByteUnit::B, ByteUnit::from_str("b").unwrap());
/// assert_eq!(ByteUnit::B, ByteUnit::from_str("B").unwrap());
/// assert_eq!(ByteUnit::KB, ByteUnit::from_str("k").unwrap());
/// assert_eq!(ByteUnit::KB, ByteUnit::from_str("K").unwrap());
/// assert_eq!(ByteUnit::KiB, ByteUnit::from_str("Kib").unwrap());
/// assert_eq!(ByteUnit::MB, ByteUnit::from_str("mb").unwrap());
/// assert_eq!(ByteUnit::MiB, ByteUnit::from_str("mib").unwrap());
/// assert_eq!(ByteUnit::GB, ByteUnit::from_str("GB").unwrap());
/// assert_eq!(ByteUnit::GiB, ByteUnit::from_str("GiB").unwrap());
/// assert_eq!(ByteUnit::TB, ByteUnit::from_str("TB").unwrap());
/// assert_eq!(ByteUnit::TiB, ByteUnit::from_str("TIB").unwrap());
/// assert_eq!(ByteUnit::PB, ByteUnit::from_str("PB").unwrap());
/// assert_eq!(ByteUnit::PiB, ByteUnit::from_str("PiB").unwrap());
/// ```
#[allow(clippy::should_implement_trait, clippy::cognitive_complexity)]
pub fn from_str<S: AsRef<str>>(unit: S) -> Result<ByteUnit, ByteError> {
let s = unit.as_ref().trim();
let mut chars = s.chars();
match chars.next() {
Some(c) => {
match c.to_ascii_uppercase() {
'B' => if chars.next().is_some() {
Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. No character is expected.", c)))
} else {
Ok(ByteUnit::B)
}
'K' => match chars.next() {
Some(c) => match c.to_ascii_uppercase() {
'I' => match chars.next() {
Some(c) => match c.to_ascii_uppercase() {
'B' => Ok(ByteUnit::KiB),
_ => Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. A 'B' is expected.", c)))
}
None => Ok(ByteUnit::KiB)
}
'B' => if chars.next().is_some() {
Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. No character is expected.", c)))
} else {
Ok(ByteUnit::KB)
}
_ => Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. A 'B' or an 'i' is expected.", c)))
}
None => Ok(ByteUnit::KB)
}
'M' => match chars.next() {
Some(c) => match c.to_ascii_uppercase() {
'I' => match chars.next() {
Some(c) => match c.to_ascii_uppercase() {
'B' => Ok(ByteUnit::MiB),
_ => Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. A 'B' is expected.", c)))
}
None => Ok(ByteUnit::MiB)
}
'B' => if chars.next().is_some() {
Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. No character is expected.", c)))
} else {
Ok(ByteUnit::MB)
},
_ => Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. A 'B' or an 'i' is expected.", c)))
}
None => Ok(ByteUnit::MB)
},
'G' => match chars.next() {
Some(c) => match c.to_ascii_uppercase() {
'I' => match chars.next() {
Some(c) => match c.to_ascii_uppercase() {
'B' => Ok(ByteUnit::GiB),
_ => Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. A 'B' is expected.", c)))
}
None => Ok(ByteUnit::GiB)
}
'B' => if chars.next().is_some() {
Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. No character is expected.", c)))
} else {
Ok(ByteUnit::GB)
},
_ => Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. A 'B' or an 'i' is expected.", c)))
}
None => Ok(ByteUnit::GB)
},
'T' => match chars.next() {
Some(c) => match c.to_ascii_uppercase() {
'I' => match chars.next() {
Some(c) => match c.to_ascii_uppercase() {
'B' => Ok(ByteUnit::TiB),
_ => Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. A 'B' is expected.", c)))
}
None => {
Ok(ByteUnit::TiB)
}
}
'B' => if chars.next().is_some() {
Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. No character is expected.", c)))
} else {
Ok(ByteUnit::TB)
},
_ => Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. A 'B' or an 'i' is expected.", c)))
}
None => Ok(ByteUnit::TB)
},
'P' => match chars.next() {
Some(c) => match c.to_ascii_uppercase() {
'I' => match chars.next() {
Some(c) => match c.to_ascii_uppercase() {
'B' => Ok(ByteUnit::PiB),
_ => Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. A 'B' is expected.", c)))
}
None => Ok(ByteUnit::PiB)
}
'B' => if chars.next().is_some() {
Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. No character is expected.", c)))
} else {
Ok(ByteUnit::PB)
},
_ => Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. A 'B' or an 'i' is expected.", c)))
}
None => Ok(ByteUnit::PB)
},
_ => Err(ByteError::UnitIncorrect(format!("The character {:?} is incorrect. A 'B', a 'K', a 'M', a 'G', a 'T', a 'P' or no character is expected.", c)))
}
}
None => Ok(ByteUnit::B)
}
}
/// Use string slice to represent this `ByteUnit`.
///
/// ```
/// extern crate byte_unit;
///
/// use byte_unit::ByteUnit;
///
/// assert_eq!("B", ByteUnit::B.as_str());
/// assert_eq!("KB", ByteUnit::KB.as_str());
/// assert_eq!("KiB", ByteUnit::KiB.as_str());
/// assert_eq!("MB", ByteUnit::MB.as_str());
/// assert_eq!("MiB", ByteUnit::MiB.as_str());
/// assert_eq!("GB", ByteUnit::GB.as_str());
/// assert_eq!("GiB", ByteUnit::GiB.as_str());
/// assert_eq!("TB", ByteUnit::TB.as_str());
/// assert_eq!("TiB", ByteUnit::TiB.as_str());
/// assert_eq!("PB", ByteUnit::PB.as_str());
/// assert_eq!("PiB", ByteUnit::PiB.as_str());
/// ```
#[inline]
pub fn as_str(self) -> &'static str {
match self {
ByteUnit::B => "B",
ByteUnit::KB => "KB",
ByteUnit::KiB => "KiB",
ByteUnit::MB => "MB",
ByteUnit::MiB => "MiB",
ByteUnit::GB => "GB",
ByteUnit::GiB => "GiB",
ByteUnit::TB => "TB",
ByteUnit::TiB => "TiB",
ByteUnit::PB => "PB",
ByteUnit::PiB => "PiB",
}
}
}