// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use crate::{sys, ErrorType, SBStream};
use std::fmt;
use std::{error::Error, ffi::CStr};
/// A container for holding any error code and an error message.
///
/// An `SBError` is used to indicate whether or not an operation
/// has succeeded or failed, along with an indication of why it
/// has failed.
///
/// To check if the operation has succeeded, use [`SBError::is_success()`].
/// If it has failed, then [`SBError::is_failure()`] will return true,
/// and more information about the error can be obtained from
/// [`SBError::error()`], [`SBError::error_string()`], and
/// [`SBError::error_type()`].
pub struct SBError {
/// The underlying raw `SBErrorRef`.
pub raw: sys::SBErrorRef,
}
impl SBError {
/// Construct a new `SBError`.
pub(crate) fn wrap(raw: sys::SBErrorRef) -> SBError {
SBError { raw }
}
/// Construct a new `Some(SBError)` or `None`.
pub(crate) fn maybe_wrap(raw: sys::SBErrorRef) -> Option<SBError> {
if unsafe { sys::SBErrorIsValid(raw) } {
Some(SBError { raw })
} else {
None
}
}
/// Does this error represent a success?
///
/// An error starts out in the success state by default:
///
/// ```
/// # use lldb::SBError;
/// let e = SBError::default();
/// assert!(e.is_success());
/// ```
///
/// See also:
///
/// * [`SBError::into_result()`]
/// * [`SBError::is_failure()`]
pub fn is_success(&self) -> bool {
unsafe { sys::SBErrorSuccess(self.raw) }
}
/// Does this error represent a failure?
///
/// See also:
///
/// * [`SBError::error()`]
/// * [`SBError::error_string()`]
/// * [`SBError::error_type()`]
/// * [`SBError::into_result()`]
/// * [`SBError::is_success()`]
pub fn is_failure(&self) -> bool {
unsafe { sys::SBErrorFail(self.raw) }
}
/// Convert to a `Result<(), SBError>`.
///
/// An `SBError` represents either a success or a failure. This method
/// converts the success variant to `Ok(())` and the error variant
/// to `Err(self)`.
///
/// ```
/// # use lldb::SBError;
/// let e = SBError::default();
/// // Do something with `e`.
/// let r = e.into_result();
/// ```
///
/// See also:
///
/// * [`SBError::error()`]
/// * [`SBError::error_string()`]
/// * [`SBError::error_type()`]
pub fn into_result(self) -> Result<(), SBError> {
if self.is_success() {
Ok(())
} else {
Err(self)
}
}
/// The underlying error code. Must be interpreted in conjunction
/// with the error type.
///
/// See also:
///
/// * [`SBError::error_string()`]
/// * [`SBError::error_type()`]
pub fn error(&self) -> u32 {
unsafe { sys::SBErrorGetError(self.raw) }
}
/// Any textual error message associated with the error.
///
/// See also:
///
/// * [`SBError::error()`]
/// * [`SBError::error_type()`]
pub fn error_string(&self) -> &str {
unsafe {
match CStr::from_ptr(sys::SBErrorGetCString(self.raw)).to_str() {
Ok(s) => s,
_ => panic!("Invalid string?"),
}
}
}
/// What type of error is this?
///
/// See also:
///
/// * [`SBError::error()`]
/// * [`SBError::error_string()`]
pub fn error_type(&self) -> ErrorType {
unsafe { sys::SBErrorGetType(self.raw) }
}
}
impl Clone for SBError {
fn clone(&self) -> SBError {
SBError {
raw: unsafe { sys::CloneSBError(self.raw) },
}
}
}
impl Default for SBError {
fn default() -> SBError {
SBError::wrap(unsafe { sys::CreateSBError() })
}
}
impl fmt::Debug for SBError {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
let stream = SBStream::new();
unsafe { sys::SBErrorGetDescription(self.raw, stream.raw) };
write!(fmt, "SBError {{ {} }}", stream.data())
}
}
impl fmt::Display for SBError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
if self.is_success() {
write!(f, "SBError representing success")
} else {
write!(f, "SBError: {}", self.error_string())
}
}
}
impl Error for SBError {}
impl Drop for SBError {
fn drop(&mut self) {
unsafe { sys::DisposeSBError(self.raw) };
}
}
unsafe impl Send for SBError {}
unsafe impl Sync for SBError {}