54 lines
1.4 KiB
Rust
54 lines
1.4 KiB
Rust
//! Corresponds to `ast::basic`.
|
|
|
|
use chumsky::prelude::*;
|
|
use chumsky::text::Character;
|
|
|
|
use crate::ast::{Ident, Line, Space};
|
|
use crate::span::Span;
|
|
|
|
pub type Error = Simple<char, Span>;
|
|
|
|
// TODO https://github.com/rust-lang/rust/issues/63063
|
|
|
|
pub fn inline() -> impl Parser<char, (), Error = Error> + Clone {
|
|
filter(|c: &char| c.is_whitespace() && *c != '\n')
|
|
.repeated()
|
|
.to(())
|
|
}
|
|
|
|
pub fn newline() -> impl Parser<char, (), Error = Error> + Clone {
|
|
just('\n').to(())
|
|
}
|
|
|
|
pub fn line() -> impl Parser<char, Line, Error = Error> + Clone {
|
|
let empty = newline().to(Line::Empty);
|
|
|
|
let comment = just('#')
|
|
.ignore_then(take_until(newline()))
|
|
.map(|(s, _)| s)
|
|
.collect::<String>()
|
|
.map(Line::Comment);
|
|
|
|
empty.or(comment)
|
|
}
|
|
|
|
pub fn space() -> impl Parser<char, Space, Error = Error> + Clone {
|
|
inline()
|
|
.ignore_then(line())
|
|
.repeated()
|
|
.then_ignore(inline())
|
|
.map_with_span(|lines, span| Space { lines, span })
|
|
}
|
|
|
|
pub fn ident() -> impl Parser<char, Ident, Error = Error> + Clone {
|
|
text::ident().try_map(|name, span| {
|
|
if matches!(
|
|
&name as &str,
|
|
"nil" | "true" | "false" | "local" | "not" | "and" | "or"
|
|
) {
|
|
Err(Simple::custom(span, "identifier uses reserved name"))
|
|
} else {
|
|
Ok(Ident { name, span })
|
|
}
|
|
})
|
|
}
|