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Copy pathint.rs
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235 lines (204 loc) · 6.36 KB
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use std::fmt::Debug;
use std::str::FromStr;
/// A Python integer literal. Represents both small (fits in an `i64`) and large integers.
#[derive(Clone, PartialEq, Eq, Hash)]
#[cfg_attr(feature = "get-size", derive(get_size2::GetSize))]
pub struct Int(Number);
impl FromStr for Int {
type Err = std::num::ParseIntError;
/// Parse an [`Int`] from a string.
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s.parse::<u64>() {
Ok(value) => Ok(Int::small(value)),
Err(err) => {
if matches!(
err.kind(),
std::num::IntErrorKind::PosOverflow | std::num::IntErrorKind::NegOverflow
) {
Ok(Int::big(s))
} else {
Err(err)
}
}
}
}
}
impl Int {
pub const ZERO: Int = Int(Number::Small(0));
pub const ONE: Int = Int(Number::Small(1));
/// Create an [`Int`] to represent a value that can be represented as an `i64`.
fn small(value: u64) -> Self {
Self(Number::Small(value))
}
/// Create an [`Int`] to represent a value that cannot be represented as an `i64`.
fn big(value: impl Into<Box<str>>) -> Self {
Self(Number::Big(value.into()))
}
/// Parse an [`Int`] from a string with a given radix, like `0x95D`.
///
/// Takes, as input, the numerical portion (`95D`), the parsed base (`16`), and the entire
/// token (`0x95D`).
pub fn from_str_radix(
number: &str,
radix: u32,
token: &str,
) -> Result<Self, std::num::ParseIntError> {
match u64::from_str_radix(number, radix) {
Ok(value) => Ok(Int::small(value)),
Err(err) => {
if matches!(
err.kind(),
std::num::IntErrorKind::PosOverflow | std::num::IntErrorKind::NegOverflow
) {
Ok(Int::big(token))
} else {
Err(err)
}
}
}
}
/// Return the [`Int`] as an u8, if it can be represented as that data type.
pub fn as_u8(&self) -> Option<u8> {
match &self.0 {
Number::Small(small) => u8::try_from(*small).ok(),
Number::Big(_) => None,
}
}
/// Return the [`Int`] as an u16, if it can be represented as that data type.
pub fn as_u16(&self) -> Option<u16> {
match &self.0 {
Number::Small(small) => u16::try_from(*small).ok(),
Number::Big(_) => None,
}
}
/// Return the [`Int`] as an u32, if it can be represented as that data type.
fn as_u32(&self) -> Option<u32> {
match &self.0 {
Number::Small(small) => u32::try_from(*small).ok(),
Number::Big(_) => None,
}
}
/// Return the [`Int`] as an u64, if it can be represented as that data type.
pub const fn as_u64(&self) -> Option<u64> {
match &self.0 {
Number::Small(small) => Some(*small),
Number::Big(_) => None,
}
}
/// Return the [`Int`] as an usize, if it can be represented as that data type.
pub fn as_usize(&self) -> Option<usize> {
match &self.0 {
Number::Small(small) => usize::try_from(*small).ok(),
Number::Big(_) => None,
}
}
/// Return the [`Int`] as an i8, if it can be represented as that data type.
pub fn as_i8(&self) -> Option<i8> {
match &self.0 {
Number::Small(small) => i8::try_from(*small).ok(),
Number::Big(_) => None,
}
}
/// Return the [`Int`] as an i16, if it can be represented as that data type.
fn as_i16(&self) -> Option<i16> {
match &self.0 {
Number::Small(small) => i16::try_from(*small).ok(),
Number::Big(_) => None,
}
}
/// Return the [`Int`] as an i32, if it can be represented as that data type.
pub fn as_i32(&self) -> Option<i32> {
match &self.0 {
Number::Small(small) => i32::try_from(*small).ok(),
Number::Big(_) => None,
}
}
/// Return the [`Int`] as an i64, if it can be represented as that data type.
pub fn as_i64(&self) -> Option<i64> {
match &self.0 {
Number::Small(small) => i64::try_from(*small).ok(),
Number::Big(_) => None,
}
}
}
impl std::fmt::Display for Int {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{}", self.0)
}
}
impl Debug for Int {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
std::fmt::Display::fmt(self, f)
}
}
impl PartialEq<u8> for Int {
fn eq(&self, other: &u8) -> bool {
self.as_u8() == Some(*other)
}
}
impl PartialEq<u16> for Int {
fn eq(&self, other: &u16) -> bool {
self.as_u16() == Some(*other)
}
}
impl PartialEq<u32> for Int {
fn eq(&self, other: &u32) -> bool {
self.as_u32() == Some(*other)
}
}
impl PartialEq<i8> for Int {
fn eq(&self, other: &i8) -> bool {
self.as_i8() == Some(*other)
}
}
impl PartialEq<i16> for Int {
fn eq(&self, other: &i16) -> bool {
self.as_i16() == Some(*other)
}
}
impl PartialEq<i32> for Int {
fn eq(&self, other: &i32) -> bool {
self.as_i32() == Some(*other)
}
}
impl PartialEq<i64> for Int {
fn eq(&self, other: &i64) -> bool {
self.as_i64() == Some(*other)
}
}
impl From<u8> for Int {
fn from(value: u8) -> Self {
Self::small(u64::from(value))
}
}
impl From<u16> for Int {
fn from(value: u16) -> Self {
Self::small(u64::from(value))
}
}
impl From<u32> for Int {
fn from(value: u32) -> Self {
Self::small(u64::from(value))
}
}
impl From<u64> for Int {
fn from(value: u64) -> Self {
Self::small(value)
}
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
#[cfg_attr(feature = "get-size", derive(get_size2::GetSize))]
enum Number {
/// A "small" number that can be represented as an `u64`.
Small(u64),
/// A "large" number that cannot be represented as an `u64`.
Big(Box<str>),
}
impl std::fmt::Display for Number {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Number::Small(value) => write!(f, "{value}"),
Number::Big(value) => write!(f, "{value}"),
}
}
}