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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use nsstring::{nsACString, nsCString};
use std::error::Error;
use std::fmt;
/// The type of errors in gecko. Uses a newtype to provide additional type
/// safety in Rust and #[repr(transparent)] to ensure the same representation
/// as the C++ equivalent.
#[repr(transparent)]
#[allow(non_camel_case_types)]
#[derive(Clone, Copy, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub struct nsresult(pub u32);
impl nsresult {
pub fn failed(self) -> bool {
(self.0 >> 31) != 0
}
pub fn succeeded(self) -> bool {
!self.failed()
}
pub fn to_result(self) -> Result<(), nsresult> {
if self.failed() {
Err(self)
} else {
Ok(())
}
}
/// Get a printable name for the nsresult error code. This function returns
/// a nsCString<'static>, which implements `Display`.
pub fn error_name(self) -> nsCString {
let mut cstr = nsCString::new();
unsafe {
Gecko_GetErrorName(self, &mut *cstr);
}
cstr
}
}
impl fmt::Display for nsresult {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.error_name())
}
}
impl fmt::Debug for nsresult {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.error_name())
}
}
impl<T, E> From<Result<T, E>> for nsresult
where
E: Into<nsresult>,
{
fn from(result: Result<T, E>) -> nsresult {
match result {
Ok(_) => NS_OK,
Err(e) => e.into(),
}
}
}
impl Error for nsresult {}
extern "C" {
fn Gecko_GetErrorName(rv: nsresult, cstr: *mut nsACString);
}
mod error_list {
include!(concat!(env!("MOZ_TOPOBJDIR"), "/xpcom/base/error_list.rs"));
}
pub use error_list::*;