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use std::error::Error as StdError;
use std::fmt;
use std::io::Error as IoError;
use std::net::AddrParseError;
use std::rc::Rc;
use std::result::Result as StdResult;
use std::str::Utf8Error;
use std::string::String as StdString;
#[derive(Debug, Clone)]
pub enum Error {
SyntaxError {
message: StdString,
incomplete_input: bool,
},
RuntimeError(StdString),
MemoryError(StdString),
#[cfg(any(feature = "lua53", feature = "lua52"))]
GarbageCollectorError(StdString),
RecursiveMutCallback,
CallbackDestructed,
StackError,
BindError,
ToLuaConversionError {
from: &'static str,
to: &'static str,
message: Option<StdString>,
},
FromLuaConversionError {
from: &'static str,
to: &'static str,
message: Option<StdString>,
},
CoroutineInactive,
UserDataTypeMismatch,
UserDataBorrowError,
UserDataBorrowMutError,
MismatchedRegistryKey,
CallbackError {
traceback: StdString,
cause: Rc<Error>,
},
ExternalError(Rc<dyn StdError>),
}
pub type Result<T> = StdResult<T, Error>;
impl fmt::Display for Error {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
match *self {
Error::SyntaxError { ref message, .. } => write!(fmt, "syntax error: {}", message),
Error::RuntimeError(ref msg) => write!(fmt, "runtime error: {}", msg),
Error::MemoryError(ref msg) => {
write!(fmt, "memory error: {}", msg)
}
#[cfg(any(feature = "lua53", feature = "lua52"))]
Error::GarbageCollectorError(ref msg) => {
write!(fmt, "garbage collector error: {}", msg)
}
Error::RecursiveMutCallback => write!(fmt, "mutable callback called recursively"),
Error::CallbackDestructed => write!(
fmt,
"a destructed callback or destructed userdata method was called"
),
Error::StackError => write!(
fmt,
"out of Lua stack, too many arguments to a Lua function or too many return values from a callback"
),
Error::BindError => write!(
fmt,
"too many arguments to Function::bind"
),
Error::ToLuaConversionError {
from,
to,
ref message,
} => {
write!(fmt, "error converting {} to Lua {}", from, to)?;
match *message {
None => Ok(()),
Some(ref message) => write!(fmt, " ({})", message),
}
}
Error::FromLuaConversionError {
from,
to,
ref message,
} => {
write!(fmt, "error converting Lua {} to {}", from, to)?;
match *message {
None => Ok(()),
Some(ref message) => write!(fmt, " ({})", message),
}
}
Error::CoroutineInactive => write!(fmt, "cannot resume inactive coroutine"),
Error::UserDataTypeMismatch => write!(fmt, "userdata is not expected type"),
Error::UserDataBorrowError => write!(fmt, "userdata already mutably borrowed"),
Error::UserDataBorrowMutError => write!(fmt, "userdata already borrowed"),
Error::MismatchedRegistryKey => {
write!(fmt, "RegistryKey used from different Lua state")
}
Error::CallbackError { ref traceback, .. } => {
write!(fmt, "callback error: {}", traceback)
}
Error::ExternalError(ref err) => write!(fmt, "{}", err),
}
}
}
impl StdError for Error {
fn source(&self) -> Option<&(dyn StdError + 'static)> {
match *self {
Error::CallbackError { ref cause, .. } => Some(cause.as_ref()),
Error::ExternalError(ref err) => err.source(),
_ => None,
}
}
}
impl Error {
pub fn external<T: Into<Box<dyn StdError>>>(err: T) -> Error {
Error::ExternalError(err.into().into())
}
}
pub trait ExternalError {
fn to_lua_err(self) -> Error;
}
impl<E> ExternalError for E
where
E: Into<Box<dyn StdError>>,
{
fn to_lua_err(self) -> Error {
Error::external(self)
}
}
pub trait ExternalResult<T> {
fn to_lua_err(self) -> Result<T>;
}
impl<T, E> ExternalResult<T> for StdResult<T, E>
where
E: ExternalError,
{
fn to_lua_err(self) -> Result<T> {
self.map_err(|e| e.to_lua_err())
}
}
impl std::convert::From<AddrParseError> for Error {
fn from(err: AddrParseError) -> Self {
Error::external(err)
}
}
impl std::convert::From<IoError> for Error {
fn from(err: IoError) -> Self {
Error::external(err)
}
}
impl std::convert::From<Utf8Error> for Error {
fn from(err: Utf8Error) -> Self {
Error::external(err)
}
}