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pub mod ast;
mod parser {
include!(concat!(env!("OUT_DIR"), "/parser.rs"));
}
pub use lalrpop_util::ParseError;
pub use crate::parser::Token;
pub struct Parser {}
impl Parser {
pub fn parse(input: &str) -> Result<ast::Expression, ParseError<usize, Token, &str>> {
Ok(*parser::ExpressionParser::new().parse(input)?)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::ast::{Expression, OpCode};
#[test]
fn literal() {
assert_eq!(Parser::parse("1"), Ok(Expression::Number(1.0)));
}
#[test]
fn binary_expression() {
assert_eq!(
Parser::parse("1+2"),
Ok(Expression::BinaryOperation {
operation: OpCode::Add,
left: Box::new(Expression::Number(1.0)),
right: Box::new(Expression::Number(2.0)),
}),
);
}
#[test]
fn binary_expression_whitespace() {
assert_eq!(Parser::parse("1 + 2 "), Parser::parse("1+2"),);
}
}