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::stuple::STuple;
use crate::types::stype::SType;
use super::expr::Expr;
use super::expr::InvalidArgumentError;
use crate::has_opcode::HasStaticOpCode;
#[derive(PartialEq, Eq, Debug, Clone)]
pub struct Fold {
pub input: Box<Expr>,
pub zero: Box<Expr>,
pub fold_op: Box<Expr>,
}
impl Fold {
pub fn new(input: Expr, zero: Expr, fold_op: Expr) -> Result<Self, InvalidArgumentError> {
let input_elem_type: SType = match input.post_eval_tpe() {
SType::SColl(elem_type) => Ok(*elem_type),
_ => Err(InvalidArgumentError(format!(
"Expected Fold input to be SColl, got {0:?}",
input.tpe()
))),
}?;
match fold_op.tpe() {
SType::SFunc(sfunc)
if sfunc.t_dom == vec![STuple::pair(zero.tpe(), input_elem_type).into()] =>
{
Ok(Fold {
input: input.into(),
zero: zero.into(),
fold_op: fold_op.into(),
})
}
_ => Err(InvalidArgumentError(format!(
"Invalid fold_op tpe: {0:?}",
fold_op.tpe()
))),
}
}
pub fn tpe(&self) -> SType {
self.zero.tpe()
}
}
impl HasStaticOpCode for Fold {
const OP_CODE: OpCode = OpCode::FOLD;
}
impl SigmaSerializable for Fold {
fn sigma_serialize<W: SigmaByteWrite>(&self, w: &mut W) -> SigmaSerializeResult {
self.input.sigma_serialize(w)?;
self.zero.sigma_serialize(w)?;
self.fold_op.sigma_serialize(w)
}
fn sigma_parse<R: SigmaByteRead>(r: &mut R) -> Result<Self, SigmaParsingError> {
let input = Expr::sigma_parse(r)?.into();
let zero = Expr::sigma_parse(r)?.into();
let fold_op = Expr::sigma_parse(r)?.into();
Ok(Fold {
input,
zero,
fold_op,
})
}
}
#[cfg(test)]
#[cfg(feature = "arbitrary")]
#[allow(clippy::panic)]
mod tests {
use super::*;
use crate::mir::expr::Expr;
use crate::serialization::sigma_serialize_roundtrip;
use proptest::prelude::*;
impl Arbitrary for Fold {
type Strategy = BoxedStrategy<Self>;
type Parameters = ();
fn arbitrary_with(_args: Self::Parameters) -> Self::Strategy {
(any::<Expr>(), any::<Expr>(), any::<Expr>())
.prop_map(|(input, zero, fold_op)| Self {
input: input.into(),
zero: zero.into(),
fold_op: fold_op.into(),
})
.boxed()
}
}
proptest! {
#![proptest_config(ProptestConfig::with_cases(16))]
#[test]
fn ser_roundtrip(v in any::<Fold>()) {
let expr: Expr = v.into();
prop_assert_eq![sigma_serialize_roundtrip(&expr), expr];
}
}
}