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use std::fmt::{self, Display}; use serde::{de, ser}; pub type Result<T> = std::result::Result<T, Error>; #[derive(Clone, Debug, PartialEq)] pub enum Error { Message(String), Eof, FieldNameUnexpectedWrapper(String), DelimiterExpected, IntegerError, NotSupported, DelimiterNotExpected, CharOverflow, TrailingCharacters, StructExpected, } impl ser::Error for Error { fn custom<T: Display>(msg: T) -> Self { Error::Message(msg.to_string()) } } impl de::Error for Error { fn custom<T: Display>(msg: T) -> Self { Error::Message(msg.to_string()) } } impl Display for Error { fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { match self { Error::Message(msg) => formatter.write_str(msg), Error::Eof => formatter.write_str("unexpected end of input"), Error::FieldNameUnexpectedWrapper(line) => formatter.write_str(&format!( "unexpected field wrapper at line {}. Field should start and end with '%' symbol", line )), Error::DelimiterExpected => formatter.write_str("delimiter expected"), Error::IntegerError => formatter.write_str("cannot parse integer"), Error::NotSupported => formatter.write_str("action not supported"), Error::DelimiterNotExpected => formatter.write_str("delimiter not expected"), Error::CharOverflow => formatter.write_str("char field must have only one letter"), Error::TrailingCharacters => formatter.write_str("unexpected trailing characters"), Error::StructExpected => formatter.write_str("expected struct type"), } } } impl std::error::Error for Error {}