language-servers/roc
1
0
Fork 0
mirror of https://github.com/roc-lang/roc.git synced 2025-08-18 11:00:16 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 7

examples for allocated

Browse source
This commit is contained in:
Trevor Settles 2024-03-03 21:55:42 -07:00
parent 3cb0edf958
commit 62e6e34470
No known key found for this signature in database
GPG key ID: F46B83058222DBAA
1 changed files with 42 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

42
crates/compiler/parse/src/parser.rs
View file

@ -821,6 +821,48 @@ where
}
}
/// Creates a parser that allocates its output and returns a reference to it
/// The new parser acts the same if its inner parser fails
///
/// # Examples
/// ```
/// # use roc_parse::state::{State};
/// # use crate::roc_parse::parser::{Parser, Progress, allocated, word};
/// # use roc_region::all::Position;
/// # use bumpalo::Bump;
/// # #[derive(Debug, PartialEq)]
/// # enum Problem {
/// # NotFound(Position),
/// # }
/// # let arena = Bump::new();
/// let parser_inner = word("hello", Problem::NotFound);
/// let parser = allocated(parser_inner);
/// let (progress, output, state) = parser.parse(&arena, State::new("hello, world".as_bytes()), 0).unwrap();
///
/// assert_eq!(progress, Progress::MadeProgress);
/// assert_eq!(output, &());
/// assert_eq!(state.pos(), Position::new(5));
/// ```
///
/// ```
/// # use roc_parse::state::{State};
/// # use crate::roc_parse::parser::{Parser, Progress, allocated, word};
/// # use roc_region::all::Position;
/// # use bumpalo::Bump;
/// # #[derive(Debug, PartialEq)]
/// # enum Problem {
/// # NotFound(Position),
/// # }
/// # let arena = Bump::new();
/// let parser_inner = word("bye", Problem::NotFound);
/// let parser_error = parser_inner.parse(&arena, State::new("hello, world".as_bytes()), 0).unwrap_err();
/// let alloc_parser = allocated(parser_inner);
///
/// assert_eq!(
/// parser_error,
/// alloc_parser.parse(&arena, State::new("hello, world".as_bytes()), 0).unwrap_err()
/// );
/// ```
pub fn allocated<'a, P, Val, Error>(parser: P) -> impl Parser<'a, &'a Val, Error>
where
Error: 'a,