cleanup: use DummyResult
to implement MacroGenerable::dummy
This commit is contained in:
parent
b968ee3656
commit
2dc15f2b96
@ -443,6 +443,10 @@ impl MacResult for DummyResult {
|
||||
span: self.span,
|
||||
}))
|
||||
}
|
||||
|
||||
fn make_ty(self: Box<DummyResult>) -> Option<P<ast::Ty>> {
|
||||
Some(DummyResult::raw_ty(self.span))
|
||||
}
|
||||
}
|
||||
|
||||
/// An enum representing the different kinds of syntax extensions.
|
||||
|
@ -43,18 +43,19 @@ trait MacroGenerable: Sized {
|
||||
fn fold_with<F: Folder>(self, folder: &mut F) -> Self;
|
||||
fn visit_with<V: Visitor>(&self, visitor: &mut V);
|
||||
|
||||
// Return a placeholder expansion to allow compilation to continue after an erroring expansion.
|
||||
fn dummy(span: Span) -> Self;
|
||||
|
||||
// The user-friendly name of the node type (e.g. "expression", "item", etc.) for diagnostics.
|
||||
fn kind_name() -> &'static str;
|
||||
|
||||
// Return a placeholder expansion to allow compilation to continue after an erroring expansion.
|
||||
fn dummy(span: Span) -> Self {
|
||||
Self::make_with(DummyResult::any(span)).unwrap()
|
||||
}
|
||||
}
|
||||
|
||||
macro_rules! impl_macro_generable {
|
||||
($($ty:ty: $kind_name:expr, .$make:ident,
|
||||
$(.$fold:ident)* $(lift .$fold_elt:ident)*,
|
||||
$(.$visit:ident)* $(lift .$visit_elt:ident)*,
|
||||
|$span:ident| $dummy:expr;)*) => { $(
|
||||
$(.$visit:ident)* $(lift .$visit_elt:ident)*;)*) => { $(
|
||||
impl MacroGenerable for $ty {
|
||||
fn kind_name() -> &'static str { $kind_name }
|
||||
fn make_with<'a>(result: Box<MacResult + 'a>) -> Option<Self> { result.$make() }
|
||||
@ -66,31 +67,24 @@ macro_rules! impl_macro_generable {
|
||||
$( visitor.$visit(self) )*
|
||||
$( for item in self.as_slice() { visitor. $visit_elt (item) } )*
|
||||
}
|
||||
fn dummy($span: Span) -> Self { $dummy }
|
||||
}
|
||||
)* }
|
||||
}
|
||||
|
||||
impl_macro_generable! {
|
||||
P<ast::Pat>: "pattern", .make_pat, .fold_pat, .visit_pat, |span| P(DummyResult::raw_pat(span));
|
||||
P<ast::Ty>: "type", .make_ty, .fold_ty, .visit_ty, |span| DummyResult::raw_ty(span);
|
||||
P<ast::Expr>:
|
||||
"expression", .make_expr, .fold_expr, .visit_expr, |span| DummyResult::raw_expr(span);
|
||||
SmallVector<ast::Stmt>:
|
||||
"statement", .make_stmts, lift .fold_stmt, lift .visit_stmt, |_span| SmallVector::zero();
|
||||
SmallVector<P<ast::Item>>:
|
||||
"item", .make_items, lift .fold_item, lift .visit_item, |_span| SmallVector::zero();
|
||||
P<ast::Expr>: "expression", .make_expr, .fold_expr, .visit_expr;
|
||||
P<ast::Pat>: "pattern", .make_pat, .fold_pat, .visit_pat;
|
||||
P<ast::Ty>: "type", .make_ty, .fold_ty, .visit_ty;
|
||||
SmallVector<ast::Stmt>: "statement", .make_stmts, lift .fold_stmt, lift .visit_stmt;
|
||||
SmallVector<P<ast::Item>>: "item", .make_items, lift .fold_item, lift .visit_item;
|
||||
SmallVector<ast::TraitItem>:
|
||||
"trait item", .make_trait_items, lift .fold_trait_item, lift .visit_trait_item,
|
||||
|_span| SmallVector::zero();
|
||||
"trait item", .make_trait_items, lift .fold_trait_item, lift .visit_trait_item;
|
||||
SmallVector<ast::ImplItem>:
|
||||
"impl item", .make_impl_items, lift .fold_impl_item, lift .visit_impl_item,
|
||||
|_span| SmallVector::zero();
|
||||
"impl item", .make_impl_items, lift .fold_impl_item, lift .visit_impl_item;
|
||||
}
|
||||
|
||||
impl MacroGenerable for Option<P<ast::Expr>> {
|
||||
fn kind_name() -> &'static str { "expression" }
|
||||
fn dummy(_span: Span) -> Self { None }
|
||||
fn make_with<'a>(result: Box<MacResult + 'a>) -> Option<Self> {
|
||||
result.make_expr().map(Some)
|
||||
}
|
||||
|
Loading…
x
Reference in New Issue
Block a user