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// Copyright 2016, The Gtk-rs Project Developers.
// See the COPYRIGHT file at the top-level directory of this distribution.
// Licensed under the MIT license, see the LICENSE file or <http://opensource.org/licenses/MIT>
//! `Error` binding and helper trait.
use std::ffi::CStr;
use std::error;
use std::fmt;
use std::str;
use std::ptr;
use std::mem;
use translate::*;
use ffi as glib_ffi;
use gobject_ffi;
glib_wrapper! {
/// A generic error capable of representing various error domains (types).
pub struct Error(Boxed<glib_ffi::GError>);
match fn {
copy => |ptr| glib_ffi::g_error_copy(ptr),
free => |ptr| glib_ffi::g_error_free(ptr),
get_type => || glib_ffi::g_error_get_type(),
}
}
unsafe impl Send for Error {}
unsafe impl Sync for Error {}
impl Error {
/// Creates an error with supplied error enum variant and message.
pub fn new<T: ErrorDomain>(error: T, message: &str) -> Error {
unsafe {
from_glib_full(
glib_ffi::g_error_new_literal(T::domain(), error.code(), message.to_glib_none().0))
}
}
/// Checks if the error domain matches `T`.
pub fn is<T: ErrorDomain>(&self) -> bool {
self.0.domain == T::domain()
}
/// Tries to convert to a specific error enum.
///
/// Returns `Some` if the error belongs to the enum's error domain and
/// `None` otherwise.
///
/// # Examples
///
/// ```ignore
/// if let Some(file_error) = error.kind::<FileError>() {
/// match file_error {
/// FileError::Exist => ...
/// FileError::Isdir => ...
/// ...
/// }
/// }
/// ```
///
/// ```ignore
/// match error {
/// Some(FileError::Exist) => ...
/// Some(FileError::Isdir) => ...
/// ...
/// }
/// ```
pub fn kind<T: ErrorDomain>(&self) -> Option<T> {
if self.0.domain == T::domain() {
T::from(self.0.code)
}
else {
None
}
}
fn message(&self) -> &str {
unsafe {
let bytes = CStr::from_ptr(self.0.message).to_bytes();
str::from_utf8(bytes).unwrap_or_else(|err| {
str::from_utf8(&bytes[..err.valid_up_to()]).unwrap()
})
}
}
// backcompat shim
#[cfg_attr(feature = "cargo-clippy", allow(not_unsafe_ptr_arg_deref))]
pub fn wrap(ptr: *mut glib_ffi::GError) -> Error {
unsafe { from_glib_full(ptr) }
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.message())
}
}
impl error::Error for Error {
fn description(&self) -> &str {
self.message()
}
}
/// `GLib` error domain.
///
/// This trait is implemented by error enums that represent error domains (types).
pub trait ErrorDomain: Copy {
/// Returns the quark identifying the error domain.
///
/// As returned from `g_some_error_quark`.
fn domain() -> glib_ffi::GQuark;
/// Gets the integer representation of the variant.
fn code(self) -> i32;
/// Tries to convert an integer code to an enum variant.
///
/// By convention, the `Failed` variant, if present, is a catch-all,
/// i.e. any unrecognized codes map to it.
fn from(code: i32) -> Option<Self> where Self: Sized;
}
/// Generic error used for functions that fail without any further information
#[derive(Debug)]
pub struct BoolError(pub &'static str);
impl BoolError {
pub fn from_glib(b: glib_ffi::gboolean, s: &'static str) -> Result<(), Self> {
match b {
glib_ffi::GFALSE => Err(BoolError(s)),
_ => Ok(()),
}
}
}
impl fmt::Display for BoolError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.0)
}
}
impl error::Error for BoolError {
fn description(&self) -> &str {
self.0
}
}