src/librustc_errors/registry.rs

   1 use rustc_data_structures::fx::FxHashMap;
   2
   3 #[derive(Debug)]
   4 pub struct InvalidErrorCode;
   5
   6 #[derive(Clone)]
   7 pub struct Registry {
   8     long_descriptions: FxHashMap<&'static str, Option<&'static str>>,
   9 }
  10
  11 impl Registry {
  12     pub fn new(long_descriptions: &[(&'static str, Option<&'static str>)]) -> Registry {
  13         Registry { long_descriptions: long_descriptions.iter().copied().collect() }
  14     }
  15
  16     /// This will panic if an invalid error code is passed in
  17     pub fn find_description(&self, code: &str) -> Option<&'static str> {
  18         self.long_descriptions[code]
  19     }
  20     /// Returns `InvalidErrorCode` if the code requested does not exist in the
  21     /// registry. Otherwise, returns an `Option` where `None` means the error
  22     /// code is valid but has no extended information.
  23     pub fn try_find_description(
  24         &self,
  25         code: &str,
  26     ) -> Result<Option<&'static str>, InvalidErrorCode> {
  27         self.long_descriptions.get(code).copied().ok_or(InvalidErrorCode)
  28     }
  29 }