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use primitive_types::{H128, H160, H256, H512, U128, U256, U512};
use super::{BigNumber, BigNumberError};
macro_rules! try_from_primitive_uint {
($type:ty) => {
impl TryFrom<BigNumber> for $type {
type Error = BigNumberError;
fn try_from(value: BigNumber) -> Result<$type, Self::Error> {
Ok(<$type>::from_str_radix(&value.hex(), 16)?)
}
}
};
}
macro_rules! try_from_primitive_hash {
($type:ty) => {
impl TryFrom<BigNumber> for $type {
type Error = BigNumberError;
fn try_from(value: BigNumber) -> Result<$type, Self::Error> {
const BYTES_LENGTH: usize = std::mem::size_of::<$type>();
let raw_hex = value.hex();
let hex = raw_hex.strip_prefix("0x").unwrap_or(&raw_hex);
if hex.starts_with('-') {
return Err(rustc_hex::FromHexError::InvalidHexCharacter('-', 0).into());
}
let bytes = (0..hex.len())
.step_by(2)
.map(|i| {
u8::from_str_radix(&hex[i..i + 2], 16).map_err(|_| {
rustc_hex::FromHexError::InvalidHexCharacter(
hex.chars().nth(i).unwrap(),
i,
)
})
})
.collect::<Result<Vec<_>, _>>()?;
if bytes.len() > BYTES_LENGTH {
return Err(rustc_hex::FromHexError::InvalidHexLength.into());
}
let mut result = [0 as u8; BYTES_LENGTH];
let offset = BYTES_LENGTH - bytes.len();
for (i, byte) in bytes.into_iter().enumerate() {
result[offset + i] = byte;
}
Ok(<$type>::from(result))
}
}
};
}
macro_rules! try_from_std {
($type:ty) => {
impl TryFrom<BigNumber> for $type {
type Error = BigNumberError;
fn try_from(value: BigNumber) -> Result<$type, Self::Error> {
let hex = value.hex();
if hex.starts_with('-') {
Ok(<$type>::from_str_radix(
&[&hex[..1], &hex[3..]].concat(),
16,
)?)
} else {
Ok(<$type>::from_str_radix(&hex[2..], 16)?)
}
}
}
};
}
try_from_primitive_uint!(U128);
try_from_primitive_uint!(U256);
try_from_primitive_uint!(U512);
try_from_primitive_hash!(H128);
try_from_primitive_hash!(H160);
try_from_primitive_hash!(H256);
try_from_primitive_hash!(H512);
try_from_std!(isize);
try_from_std!(i8);
try_from_std!(i16);
try_from_std!(i32);
try_from_std!(i64);
try_from_std!(i128);
try_from_std!(usize);
try_from_std!(u8);
try_from_std!(u16);
try_from_std!(u32);
try_from_std!(u64);
try_from_std!(u128);
#[cfg(test)]
mod tests {
use primitive_types::{H160, H256, H512, U128, U256, U512};
use wasm_bindgen_test::*;
use super::{BigNumber, BigNumberError};
#[wasm_bindgen_test]
fn primitive_uint() {
let bignumber = BigNumber::new(U256::MAX.to_string());
let middle_bignumber = BigNumber::new((U256::MAX - U256::from(U128::MAX)).to_string());
assert!(matches!(
U128::try_from(BigNumber::from(bignumber.clone())).err(),
Some(BigNumberError::PrimitiveUint(_))
));
assert_eq!(
U256::try_from(BigNumber::from(bignumber.clone())).unwrap(),
U256::MAX
);
assert_eq!(
U256::try_from(middle_bignumber).unwrap(),
U256::MAX - U256::from(U128::MAX)
);
assert_eq!(U512::try_from(bignumber).unwrap(), U512::from(U256::MAX));
}
#[wasm_bindgen_test]
fn primitive_hash() {
let h256 = H256::from([u8::MAX; 32]);
let bignumber = BigNumber::new(format!("{:#x}", h256));
let middle_h256 = H256::from(
<[u8; 32]>::try_from([[0; 8], [u8::MAX; 8], [u8::MAX; 8], [0; 8]].concat()).unwrap(),
);
let middle_bignumber = BigNumber::new(format!("{:#x}", middle_h256));
assert!(matches!(
H160::try_from(BigNumber::from(bignumber.clone())).err(),
Some(BigNumberError::PrimitiveHash(_))
));
assert_eq!(
H256::try_from(BigNumber::from(bignumber.clone())).unwrap(),
H256::from([u8::MAX; 32]),
);
assert_eq!(H256::try_from(middle_bignumber).unwrap(), middle_h256);
assert_eq!(
H512::try_from(bignumber).unwrap(),
H512::from(<[u8; 64]>::try_from([[0; 32], [u8::MAX; 32]].concat()).unwrap()),
);
}
#[wasm_bindgen_test]
fn std_uint() {
let bignumber = BigNumber::new(u64::MAX.to_string());
let middle_u64 = u64::MAX - u32::MAX as u64;
let middle_bignumber = BigNumber::new(middle_u64.to_string());
assert!(matches!(
u8::try_from(BigNumber::from(bignumber.clone())).err(),
Some(BigNumberError::Std(_))
));
assert_eq!(u64::try_from(middle_bignumber).unwrap(), middle_u64);
assert_eq!(u128::try_from(bignumber).unwrap(), u64::MAX as u128);
}
#[wasm_bindgen_test]
fn std_int() {
let bignumber = BigNumber::new(i64::MIN.to_string());
let middle_i64 = i64::MIN - i32::MIN as i64;
let middle_bignumber = BigNumber::new(middle_i64.to_string());
assert!(matches!(
u8::try_from(BigNumber::from(bignumber.clone())).err(),
Some(BigNumberError::Std(_))
));
assert_eq!(i64::try_from(middle_bignumber).unwrap(), middle_i64);
assert_eq!(i128::try_from(bignumber).unwrap(), i64::MIN as i128);
}
}