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Clean up and tighten faster version of expr_prec_layer macro

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This commit is contained in:
Dirkjan Ochtman 2017-09-04 20:31:28 +02:00
parent 9a21f5eaa3
commit 6145cb5a48
1 changed files with 10 additions and 15 deletions
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25
askama_shared/src/parser.rs
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@ -229,21 +229,16 @@ named!(expr_filtered<Expr>, do_parse!(
macro_rules! expr_prec_layer {
( $name:ident, $inner:ident, $( $op:expr ),* ) => {
named!($name<Expr>,
do_parse!(
left: $inner >>
op_and_right: opt!(pair!(ws!(alt!($( tag_s!($op) )|*)), expr_any)) >>
(
if op_and_right.is_some() {
let (op, right) = op_and_right.unwrap();
(Expr::BinOp(str::from_utf8(op).unwrap(),
Box::new(left), Box::new(right)))
} else {
left
}
)
)
);
named!($name<Expr>, do_parse!(
left: $inner >>
op_and_right: opt!(pair!(ws!(alt!($( tag_s!($op) )|*)), expr_any)) >>
(match op_and_right {
Some((op, right)) => Expr::BinOp(
str::from_utf8(op).unwrap(), Box::new(left), Box::new(right)
),
None => left,
})
));
}
}