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fix "if" parsing

This commit is contained in:
minish 2025-07-20 00:06:32 -04:00
parent 1510dee5ae
commit 56a07748cd
Signed by: min
SSH Key Fingerprint: SHA256:h4k7JNrfe1dzv1WE3oGVeAY9DPSZXIu3/j89+6DtHWE
1 changed files with 39 additions and 32 deletions
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71
src/parser.rs
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@ -137,40 +137,47 @@ where
// unary ops!! (prefix)
t if t.prefix_precedence().is_some() => {
let prec = t.prefix_precedence().unwrap();
// parse function
if matches!(t, Token::Func) {
// parse args
self.expect_next(TokenKind::ParenOpen)?;
let args =
self.parse_delimited_until(TokenKind::Comma, Some(TokenKind::ParenClose))?;
self.eat();
match t {
// parse function
Token::Func => {
// parse args
self.expect_next(TokenKind::ParenOpen)?;
let args = self
.parse_delimited_until(TokenKind::Comma, Some(TokenKind::ParenClose))?;
self.eat();
// parse body
let body = self.parse_expr(prec, in_group)?;
// pack
Box::new(Expr::Func(args, body))
}
// parse if
Token::If => {
// parse the condition
let cond = self.parse_expr(Precedence::Min, false)?;
// parse the true case
let true_case = self.parse_expr(prec, in_group)?;
// and maybe a false case
let false_case = matches!(self.try_peek(), Ok(Token::Else))
.then(|| {
self.eat();
self.parse_expr(prec, in_group)
})
.transpose()?;
// pack
Box::new(Expr::If(cond, true_case, false_case))
}
// parse body
let body = self.parse_expr(prec, in_group)?;
// another op
_ => {
let rhs = self.parse_expr(prec, in_group)?;
Box::new(match t {
Token::Minus => Expr::Negate(rhs),
Token::Not => Expr::Not(rhs),
Token::Return => Expr::Return(rhs),
// pack
Box::new(Expr::Func(args, body))
} else {
let rhs = self.parse_expr(prec, in_group)?;
Box::new(match t {
Token::Minus => Expr::Negate(rhs),
Token::Not => Expr::Not(rhs),
Token::Return => Expr::Return(rhs),
Token::If => {
// parse the true case
let true_case = self.parse_expr(prec, in_group)?;
// and maybe a false case
let false_case = matches!(self.try_peek(), Ok(Token::Else))
.then(|| {
self.eat();
self.parse_expr(prec, in_group)
})
.transpose()?;
// pack
Expr::If(rhs, true_case, false_case)
}
_ => unreachable!(),
})
_ => unreachable!(),
})
}
}
}