60 lines
1.5 KiB
Rust
60 lines
1.5 KiB
Rust
//! Corresponds to `ast::basic`.
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use chumsky::prelude::*;
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use chumsky::text::Character;
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use crate::ast::{Ident, Line, Space};
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use crate::span::Span;
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pub type Error = Simple<char, Span>;
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pub type EParser<O> = BoxedParser<'static, char, O, Error>;
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fn inline() -> impl Parser<char, (), Error = Error> {
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filter(|c: &char| c.is_whitespace() && *c != '\n')
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.repeated()
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.to(())
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}
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fn newline() -> impl Parser<char, (), Error = Error> {
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just('\n').to(())
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}
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fn line() -> impl Parser<char, Line, Error = Error> {
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let empty = newline().to(Line::Empty);
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let comment = just('#')
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.ignore_then(take_until(newline()))
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.map(|(s, _)| s)
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.collect::<String>()
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.map(Line::Comment);
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empty.or(comment)
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}
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pub fn space() -> EParser<Space> {
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inline()
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.ignore_then(line())
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.repeated()
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.then_ignore(inline())
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.map_with_span(|lines, span| Space { lines, span })
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.boxed()
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}
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pub fn ident() -> EParser<Ident> {
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text::ident()
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.try_map(|name, span| {
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if matches!(
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&name as &str,
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"nil" | "true" | "false" | "not" | "and" | "or" | "local" | "function" | "module"
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) {
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Err(Simple::custom(span, "identifier uses reserved name"))
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} else {
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Ok(Ident { name, span })
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}
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})
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.boxed()
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}
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pub fn local(space: EParser<Space>) -> EParser<Option<Space>> {
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text::keyword("local").ignore_then(space).or_not().boxed()
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}
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