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use crate::{base_convert::BaseConvertError, utils::rem_up, Uint};
use core::fmt::{
Binary, Debug, Display, Formatter, LowerHex, Octal, Result as FmtResult, UpperHex,
};
use std::str::FromStr;
use thiserror::Error;
impl<const BITS: usize, const LIMBS: usize> Display for Uint<BITS, LIMBS> {
fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
const BASE: u64 = 10_000_000_000_000_000_000_u64;
let mut spigot = self.to_base_be(BASE);
write!(f, "{}", spigot.next().unwrap_or(0))?;
for digits in spigot {
write!(f, "{:019}", digits)?;
}
Ok(())
}
}
impl<const BITS: usize, const LIMBS: usize> Debug for Uint<BITS, LIMBS> {
fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
write!(f, "{:#x}_U{}", self, BITS)
}
}
impl<const BITS: usize, const LIMBS: usize> LowerHex for Uint<BITS, LIMBS> {
fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
if f.alternate() {
write!(f, "0x")?;
}
let mut limbs = self.as_limbs().iter().rev();
if let Some(first) = limbs.next() {
let width = 2 * rem_up(Self::BYTES, 8);
write!(f, "{:0width$x}", first, width = width)?;
}
for limb in limbs {
write!(f, "{:016x}", limb)?;
}
Ok(())
}
}
impl<const BITS: usize, const LIMBS: usize> UpperHex for Uint<BITS, LIMBS> {
fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
if f.alternate() {
write!(f, "0x")?;
}
let mut limbs = self.as_limbs().iter().rev();
if let Some(first) = limbs.next() {
let width = 2 * rem_up(Self::BYTES, 8);
write!(f, "{:0width$X}", first, width = width)?;
}
for limb in limbs {
write!(f, "{:016X}", limb)?;
}
Ok(())
}
}
impl<const BITS: usize, const LIMBS: usize> Binary for Uint<BITS, LIMBS> {
fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
if f.alternate() {
write!(f, "0b")?;
}
let mut limbs = self.as_limbs().iter().rev();
if let Some(first) = limbs.next() {
let width = rem_up(Self::BITS, 64);
write!(f, "{:0width$b}", first, width = width)?;
}
for limb in limbs {
write!(f, "{:064b}", limb)?;
}
Ok(())
}
}
impl<const BITS: usize, const LIMBS: usize> Octal for Uint<BITS, LIMBS> {
fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
const BASE: u64 = 0x8000_0000_0000_0000_u64;
let mut spigot = self.to_base_be(BASE);
write!(f, "{:o}", spigot.next().unwrap_or(0))?;
for digits in spigot {
write!(f, "{:021o}", digits)?;
}
Ok(())
}
}
#[derive(Debug, Copy, Clone, PartialEq, Eq, Error)]
pub enum ParseError {
#[error("invalid digit")]
InvalidDigit(char),
#[error("invalid radix, up to 36 is supported")]
InvalidRadix(u64),
#[error(transparent)]
BaseConvertError(#[from] BaseConvertError),
}
impl<const BITS: usize, const LIMBS: usize> Uint<BITS, LIMBS> {
pub fn from_str_radix(src: &str, radix: u64) -> Result<Self, ParseError> {
if radix > 64 {
return Err(ParseError::InvalidRadix(radix));
}
let mut err = None;
let digits = src.chars().filter_map(|c| {
if err.is_some() {
return None;
}
let digit = if radix <= 36 {
match c {
'0'..='9' => u64::from(c) - u64::from('0'),
'a'..='z' => u64::from(c) - u64::from('a') + 10,
'A'..='Z' => u64::from(c) - u64::from('A') + 10,
'_' => return None,
_ => {
err = Some(ParseError::InvalidDigit(c));
return None;
}
}
} else {
match c {
'A'..='Z' => u64::from(c) - u64::from('A'),
'a'..='f' => u64::from(c) - u64::from('a') + 26,
'0'..='9' => u64::from(c) - u64::from('0') + 52,
'+' | '-' => 62,
'/' | ',' | '_' => 63,
'=' | '\r' | '\n' => return None,
_ => {
err = Some(ParseError::InvalidDigit(c));
return None;
}
}
};
Some(digit)
});
let value = Self::from_base_be(radix, digits)?;
err.map_or(Ok(value), Err)
}
}
impl<const BITS: usize, const LIMBS: usize> FromStr for Uint<BITS, LIMBS> {
type Err = ParseError;
fn from_str(src: &str) -> Result<Self, Self::Err> {
if src.len() >= 2 {
match &src[..2] {
"0x" | "0X" => return Self::from_str_radix(&src[2..], 16),
"0o" | "0O" => return Self::from_str_radix(&src[2..], 8),
"0b" | "0B" => return Self::from_str_radix(&src[2..], 2),
_ => {}
}
}
Self::from_str_radix(src, 10)
}
}
#[cfg(test)]
mod tests {
use super::*;
use proptest::proptest;
#[allow(clippy::unreadable_literal)]
const N: Uint<256, 4> = Uint::from_limbs([
0xa8ec92344438aaf4_u64,
0x9819ebdbd1faaab1_u64,
0x573b1a7064c19c1a_u64,
0xc85ef7d79691fe79_u64,
]);
#[test]
fn test_num() {
assert_eq!(
N.to_string(),
"90630363884335538722706632492458228784305343302099024356772372330524102404852"
);
assert_eq!(
format!("{:x}", N),
"c85ef7d79691fe79573b1a7064c19c1a9819ebdbd1faaab1a8ec92344438aaf4"
);
assert_eq!(
format!("{:b}", N),
"1100100001011110111101111101011110010110100100011111111001111001010101110011101100011010011100000110010011000001100111000001101010011000000110011110101111011011110100011111101010101010101100011010100011101100100100100011010001000100001110001010101011110100"
);
assert_eq!(
format!("{:o}", N),
"14413675753626443771712563543234062301470152300636573364375252543243544443210416125364"
);
}
#[test]
fn test_hex() {
proptest!(|(value: u64)| {
let n: Uint<64, 1> = Uint::from(value);
assert_eq!(format!("{:x}", n), format!("{:016x}", value));
assert_eq!(format!("{:#x}", n), format!("{:#018x}", value));
assert_eq!(format!("{:X}", n), format!("{:016X}", value));
assert_eq!(format!("{:#X}", n), format!("{:#018X}", value));
assert_eq!(format!("{:b}", n), format!("{:064b}", value));
assert_eq!(format!("{:#b}", n), format!("{:#066b}", value));
});
}
}