use super::expr::Expr;
use super::expr::InvalidArgumentError;
use crate::serialization::op_code::OpCode;
use crate::serialization::sigma_byte_reader::SigmaByteRead;
use crate::serialization::sigma_byte_writer::SigmaByteWrite;
use crate::serialization::SigmaParsingError;
use crate::serialization::SigmaSerializable;
use crate::serialization::SigmaSerializeResult;
use crate::types::stype::SType;
use crate::has_opcode::HasStaticOpCode;
#[derive(PartialEq, Eq, Debug, Clone)]
pub struct Downcast {
pub input: Box<Expr>,
pub tpe: SType,
}
impl Downcast {
pub fn new(input: Expr, target_tpe: SType) -> Result<Self, InvalidArgumentError> {
if !target_tpe.is_numeric() {
return Err(InvalidArgumentError(format!(
"Downcast: expected target type to be numeric, got {:?}",
target_tpe
)));
}
let post_eval_tpe = input.post_eval_tpe();
if post_eval_tpe.is_numeric() {
Ok(Self {
input: input.into(),
tpe: target_tpe,
})
} else {
Err(InvalidArgumentError(format!(
"Downcast: expected input value type to be numeric, got {:?}",
post_eval_tpe
)))
}
}
pub fn tpe(&self) -> SType {
self.tpe.clone()
}
}
impl HasStaticOpCode for Downcast {
const OP_CODE: OpCode = OpCode::DOWNCAST;
}
impl SigmaSerializable for Downcast {
fn sigma_serialize<W: SigmaByteWrite>(&self, w: &mut W) -> SigmaSerializeResult {
self.input.sigma_serialize(w)?;
self.tpe.sigma_serialize(w)
}
fn sigma_parse<R: SigmaByteRead>(r: &mut R) -> Result<Self, SigmaParsingError> {
let input = Expr::sigma_parse(r)?.into();
let tpe = SType::sigma_parse(r)?;
Ok(Downcast { input, tpe })
}
}
#[cfg(feature = "arbitrary")]
#[allow(clippy::unwrap_used)]
mod arbitrary {
use crate::mir::expr::arbitrary::ArbExprParams;
use super::*;
use proptest::prelude::*;
impl Arbitrary for Downcast {
type Parameters = ();
type Strategy = BoxedStrategy<Self>;
fn arbitrary_with(_args: Self::Parameters) -> Self::Strategy {
any_with::<Expr>(ArbExprParams {
tpe: SType::SLong,
depth: 2,
})
.prop_map(|input| Downcast::new(input, SType::SInt).unwrap())
.boxed()
}
}
}
#[cfg(test)]
#[cfg(feature = "arbitrary")]
#[allow(clippy::panic)]
pub mod proptests {
use super::*;
use crate::serialization::sigma_serialize_roundtrip;
use proptest::prelude::*;
proptest! {
#[test]
fn ser_roundtrip(v in any::<Downcast>()) {
let expr: Expr = v.into();
prop_assert_eq![sigma_serialize_roundtrip(&expr), expr];
}
}
}