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extern crate core; use std::error::Error; use std::fmt; use ::StreamErrorKind::{OnStrError, End, StreamBad}; pub mod io; #[derive(Debug)] pub struct StreamError{ err_type:StreamErrorKind } impl StreamError{ pub fn new_bad() ->StreamError{ StreamError{ err_type:StreamBad} } pub fn new_end() ->StreamError{ StreamError{ err_type:End} } pub fn new_str(msg:&str) ->StreamError{ StreamError{ err_type:OnStrError(msg.to_string())} } pub fn from_str(msg:&str) ->Result<(),StreamError>{ Err(StreamError{ err_type:OnStrError(msg.to_string())}) } pub fn end() ->Result<(),StreamError>{ Err(StreamError{ err_type:End}) } } impl fmt::Display for StreamError { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { self.err_type.fmt(f) } } impl Error for StreamError{ fn description(&self) -> &str { self.err_type.description() } fn cause(&self) -> Option<&Error> { Some(&self.err_type) } } #[derive(Debug)] pub enum StreamErrorKind{ OnStrError(String), End, StreamBad } impl fmt::Display for StreamErrorKind { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { match &self { StreamErrorKind::OnStrError(msg)=> write!(f,"{}", msg), StreamErrorKind::End=>write!(f,"stream postion is end"), StreamErrorKind::StreamBad=>write!(f,"stream is bad") } } } impl Error for StreamErrorKind{ fn description(&self) -> &str { match &self { StreamErrorKind::OnStrError(msg)=> msg, StreamErrorKind::End=>"stream postion is end", StreamErrorKind::StreamBad=>"stream is bad" } } }