94 lines
2.9 KiB
Rust
94 lines
2.9 KiB
Rust
use super::{
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ast::{Expr, Spanned},
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lexer::Token,
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};
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use chumsky::{prelude::*, Stream};
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use logos::Logos;
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/// Parse source string into a Expr
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pub fn parse(src: &str) -> Result<Vec<Spanned<Expr>>, Vec<Simple<Token<'_>>>> {
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let lexer = Token::lexer(src);
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let len = lexer.source().len();
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parser().parse(Stream::from_iter(len..len + 1, lexer.spanned()))
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}
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fn parser<'s>() -> impl Parser<Token<'s>, Vec<Spanned<Expr<'s>>>, Error = Simple<Token<'s>>> {
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recursive(|expr| {
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let atom = select! {
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Token::Symbol(s) => Expr::Symbol(s),
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Token::Keyword(k) => Expr::Keyword(k),
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Token::String(s) => Expr::String(s),
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Token::Number(n) => Expr::Number(n),
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};
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let list = expr
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.clone()
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.repeated()
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.delimited_by(just(Token::LeftParen), just(Token::RightParen));
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let vector = just(Token::Octothorpe)
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.ignore_then(list.clone())
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.map(Expr::Vector);
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let list = list.map(Expr::List);
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let quote = just(Token::Quote)
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.ignore_then(expr.clone())
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.map(Box::new)
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.map(Expr::Quote);
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let pair = expr
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.clone()
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.then_ignore(just(Token::Dot))
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.then(expr)
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.delimited_by(just(Token::LeftParen), just(Token::RightParen))
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.map(|(l, r)| Expr::Pair((Box::new(l), Box::new(r))));
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atom.or(pair)
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.or(list)
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.or(vector)
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.or(quote)
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.map_with_span(Spanned::new)
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})
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.repeated()
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.then_ignore(end())
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn function() {
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assert_eq!(
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parse(r#"(defun hello (name) (log (concat "Hello, " name "!")))"#).unwrap(),
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&[Spanned::new(
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Expr::List(vec![
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Spanned::new(Expr::Symbol("defun"), 1..6),
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Spanned::new(Expr::Symbol("hello"), 7..12),
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Spanned::new(
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Expr::List(vec![Spanned::new(Expr::Symbol("name"), 14..18),]),
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13..19,
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),
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Spanned::new(
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Expr::List(vec![
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Spanned::new(Expr::Symbol("log"), 21..24),
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Spanned::new(
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Expr::List(vec![
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Spanned::new(Expr::Symbol("concat"), 26..32),
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Spanned::new(Expr::String("Hello, "), 33..42),
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Spanned::new(Expr::Symbol("name"), 43..47),
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Spanned::new(Expr::String("!"), 48..51),
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]),
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48..51
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)
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]),
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20..53
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)
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]),
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0..54,
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)]
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);
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}
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}
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