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use lalrpop_util;
use crate::grammar;
use crate::grammar_util::BoxExpr;
use crate::lexer::{Lexer, LexicalError, Tok};
pub type ParseError<'i> = lalrpop_util::ParseError<usize, Tok<'i>, LexicalError>;
pub fn parse_expr(s: &str) -> Result<BoxExpr, ParseError> {
grammar::ExprParser::new().parse(Lexer::new(s))
}
#[test]
fn test_parse() {
use crate::core::Expr::*;
println!("test {:?}", parse_expr("3 + 5 * 10"));
assert!(parse_expr("22").is_ok());
assert!(parse_expr("(22)").is_ok());
assert_eq!(parse_expr("3 + 5 * 10").ok(),
Some(Box::new(NaturalPlus(Box::new(NaturalLit(3)),
Box::new(NaturalTimes(Box::new(NaturalLit(5)),
Box::new(NaturalLit(10))))))));
// The original parser is apparently right-associative
assert_eq!(parse_expr("2 * 3 * 4").ok(),
Some(Box::new(NaturalTimes(Box::new(NaturalLit(2)),
Box::new(NaturalTimes(Box::new(NaturalLit(3)),
Box::new(NaturalLit(4))))))));
assert!(parse_expr("((((22))))").is_ok());
assert!(parse_expr("((22)").is_err());
println!("{:?}", parse_expr("\\(b : Bool) -> b == False"));
assert!(parse_expr("\\(b : Bool) -> b == False").is_ok());
println!("{:?}", parse_expr("foo.bar"));
assert!(parse_expr("foo.bar").is_ok());
assert!(parse_expr("[] : List Bool").is_ok());
}
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