-// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// 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 rustc_data_structures::fx::FxHashMap;
-use std::collections::HashMap;
+#[derive(Debug)]
+pub struct InvalidErrorCode;
#[derive(Clone)]
pub struct Registry {
- descriptions: HashMap<&'static str, &'static str>,
+ long_descriptions: FxHashMap<&'static str, Option<&'static str>>,
}
impl Registry {
- pub fn new(descriptions: &[(&'static str, &'static str)]) -> Registry {
- Registry { descriptions: descriptions.iter().cloned().collect() }
+ pub fn new(long_descriptions: &[(&'static str, Option<&'static str>)]) -> Registry {
+ Registry { long_descriptions: long_descriptions.iter().copied().collect() }
}
+ /// This will panic if an invalid error code is passed in
pub fn find_description(&self, code: &str) -> Option<&'static str> {
- self.descriptions.get(code).cloned()
+ self.long_descriptions[code]
+ }
+ /// Returns `InvalidErrorCode` if the code requested does not exist in the
+ /// registry. Otherwise, returns an `Option` where `None` means the error
+ /// code is valid but has no extended information.
+ pub fn try_find_description(
+ &self,
+ code: &str,
+ ) -> Result<Option<&'static str>, InvalidErrorCode> {
+ self.long_descriptions.get(code).copied().ok_or(InvalidErrorCode)
}
}