36 lines
1.2 KiB
Rust
36 lines
1.2 KiB
Rust
use crate::ast::Separated;
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impl<E, S1, S2> Separated<E, S1, S2> {
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pub fn desugar_elem(self, desugar_elem: impl Fn(E) -> (E, bool)) -> (Self, bool) {
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match self {
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Self::Empty(span) => (Self::Empty(span), false),
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Self::NonEmpty {
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first_elem,
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last_elems,
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trailing,
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span,
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} => {
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let (new_first_elem, mut desugared) = desugar_elem(first_elem);
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let mut new_last_elems = vec![];
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for (separator, elem) in last_elems {
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if desugared {
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new_last_elems.push((separator, elem));
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} else {
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let (elem, elem_desugared) = desugar_elem(elem);
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desugared = desugared || elem_desugared;
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new_last_elems.push((separator, elem));
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}
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}
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let new = Self::NonEmpty {
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first_elem: new_first_elem,
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last_elems: new_last_elems,
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trailing,
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span,
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};
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(new, desugared)
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}
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}
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}
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}
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