vest_lib 0.2.2

Verified parser and serializer combinators in Verus
Documentation 
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//! Executable implementation for boolean-gated formats.
use crate::core::exec::output::*;
use crate::core::{
    exec::{
        parser::{PResult, Parser},
        serializer::{ByteLen, ComplianceErrorKind, PreSerializeError, Prepare, Serializer},
        ParseError,
    },
    spec::SpecParser,
};
use vstd::prelude::*;
use OutputBuf;

verus! {

impl<I, Inner> Parser<I> for super::Cond<Inner> where I: View<V = Seq<u8>>, Inner: Parser<I> {
    type PT = Inner::PT;

    fn min_byte_len(&self) -> usize {
        0
    }

    open spec fn exec_inv(&self) -> bool {
        self.1.exec_inv()
    }

    fn parse(&self, ibuf: &I) -> PResult<Self::PT> {
        if self.0 {
            self.1.parse(ibuf)
        } else {
            Err(ParseError::cond_rejected())
        }
    }
}

impl<Output: OutputBuf, Inner, T> Serializer<Output, T> for super::Cond<Inner> where
    T: DeepView,
    Inner: Serializer<Output, T>,
 {
    #[verifier::prophetic]
    open spec fn exec_inv(&self) -> bool {
        self.1.exec_inv()
    }

    fn serialize_into(&self, v: &T, obuf: &mut Output) {
        self.1.serialize_into(v, obuf);
    }
}

impl<T, Inner> ByteLen<T> for super::Cond<Inner> where T: DeepView, Inner: ByteLen<T> {
    open spec fn exec_inv(&self) -> bool {
        self.1.exec_inv()
    }

    fn length(&self, v: &T) -> (len: usize) {
        self.1.length(v)
    }
}

impl<T, Inner> Prepare<T> for super::Cond<Inner> where T: DeepView, Inner: Prepare<T> {
    open spec fn exec_inv(&self) -> bool {
        self.1.exec_inv()
    }

    fn prepare(&self, v: &T) -> (checked: Result<usize, PreSerializeError>) {
        if self.0 {
            self.1.prepare(v)
        } else {
            Err(PreSerializeError::not_compliant(ComplianceErrorKind::CondRejected))
        }
    }
}

} // verus!