1use core::fmt::Display;
 2
 3#[derive(Debug, PartialEq, Eq)]
 4pub enum TieredSmtProofError {
 5    EntriesEmpty,
 6    EmptyValueNotAllowed,
 7    MismatchedPrefixes(u64, u64),
 8    MultipleEntriesOutsideLastTier,
 9    NotATierPath(u8),
10    PathTooLong,
11}
12
13impl Display for TieredSmtProofError {
14    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
15        match self {
16            TieredSmtProofError::EntriesEmpty => {
17                write!(f, "Missing entries for tiered sparse merkle tree proof")
18            }
19            TieredSmtProofError::EmptyValueNotAllowed => {
20                write!(
21                    f,
22                    "The empty value [0, 0, 0, 0] is not allowed inside a tiered sparse merkle tree"
23                )
24            }
25            TieredSmtProofError::MismatchedPrefixes(first, second) => {
26                write!(f, "Not all leaves have the same prefix. First {first} second {second}")
27            }
28            TieredSmtProofError::MultipleEntriesOutsideLastTier => {
29                write!(f, "Multiple entries are only allowed for the last tier (depth 64)")
30            }
31            TieredSmtProofError::NotATierPath(got) => {
32                write!(
33                    f,
34                    "Path length does not correspond to a tier. Got {got} Expected one of 16, 32, 48, 64"
35                )
36            }
37            TieredSmtProofError::PathTooLong => {
38                write!(
39                    f,
40                    "Path longer than maximum depth of 64 for tiered sparse merkle tree proof"
41                )
42            }
43        }
44    }
45}
46
47#[cfg(feature = "std")]
48impl std::error::Error for TieredSmtProofError {}