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//! Error type.
use std::fmt;
#[derive(Debug)]
pub enum StructIs {
Unnamed,
Enum,
Union,
Unit,
}
impl fmt::Display for StructIs {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
Self::Unnamed => write!(f, "an unnamed struct"),
Self::Enum => write!(f, "an enum"),
Self::Union => write!(f, "a union"),
Self::Unit => write!(f, "a unit struct"),
}
}
}
// Almost an error type! But `syn` already has an error type so this just fills the
// `T: Display` part to avoid strings littering the source.
#[derive(Debug)]
pub enum Problem {
NotNamedStruct(StructIs),
UnnamedField,
InnerAttribute,
EmptyAttribute,
NoGrouping,
NonParensGrouping,
EmptyGrouping,
TokensFollowSkip,
TokensFollowNewName,
InvalidAttribute,
}
impl fmt::Display for Problem {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
Self::NotNamedStruct(is) => {
write!(f, "type must be a named struct, not {}", is)
},
Self::UnnamedField => write!(f, "struct fields must be named"),
Self::InnerAttribute => {
write!(f, "attribute is an outer not inner attribute")
},
Self::EmptyAttribute => write!(f, "attribute has no tokens"),
Self::NoGrouping => write!(f, "attribute tokens must be grouped"),
Self::NonParensGrouping => {
write!(f, "attribute tokens must be within parenthesis")
},
Self::EmptyGrouping => {
write!(f, "no attribute tokens within parenthesis grouping")
},
Self::TokensFollowSkip => {
write!(f, "tokens are not meant to follow skip attribute")
},
Self::TokensFollowNewName => {
write!(f, "no further tokens must follow new name")
},
Self::InvalidAttribute => {
write!(f, "invalid attribute")
},
}
}
}
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