52 lines
1.7 KiB
Rust
52 lines
1.7 KiB
Rust
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//! A wrapper for `NSError`, which can be (and is) bubbled up for certain calls in this library. It
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//! attempts to be thread safe where possible, and extract the "default" usable information out of
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//! an `NSError`. This might not be what you need, though, so if it's missing something... well,
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//! it's up for discussion.
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use std::error;
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use std::fmt;
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use cocoa::base::id;
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use objc::{msg_send, sel, sel_impl};
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use crate::utils::str_from;
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/// A wrapper around pieces of data extracted from `NSError`. This could be improved: right now, it
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/// allocates `String` instances when theoretically it could be avoided, and we might be erasing
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/// certain parts of the `NSError` object that are useful.
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#[derive(Clone, Debug)]
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pub struct AppKitError {
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pub code: usize,
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pub domain: String,
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pub description: String
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}
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impl AppKitError {
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/// Given an `NSError` (i.e, an id reference) we'll pull out the relevant information and
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/// configure this. We pull out the information as it makes the error thread safe this way,
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/// which is... easier, in some cases.
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pub fn new(error: id) -> Box<Self> {
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let (code, domain, description) = unsafe {
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let code: usize = msg_send![error, code];
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let domain: id = msg_send![error, domain];
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let description: id = msg_send![error, localizedDescription];
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(code, domain, description)
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};
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Box::new(AppKitError {
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code: code,
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domain: str_from(domain).to_string(),
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description: str_from(description).to_string()
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})
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}
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}
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impl fmt::Display for AppKitError {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{}", self.description)
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}
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}
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impl error::Error for AppKitError {}
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