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Unify associated item parsing more.

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This commit is contained in:
Mazdak Farrokhzad 2019-12-01 17:29:13 +01:00
parent 0d8a9d74e3
commit 51ccdebe0b
1 changed files with 20 additions and 29 deletions
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49
src/librustc_parse/parser/item.rs
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@ -669,25 +669,6 @@ fn parse_impl_body(&mut self) -> PResult<'a, (Vec<AssocItem>, Vec<Attribute>)> {
Ok((impl_items, attrs))
}
/// Parses an impl item.
pub fn parse_impl_item(&mut self, at_end: &mut bool) -> PResult<'a, AssocItem> {
maybe_whole!(self, NtImplItem, |x| x);
let attrs = self.parse_outer_attributes()?;
let mut unclosed_delims = vec![];
let (mut item, tokens) = self.collect_tokens(|this| {
let item = this.parse_assoc_item(at_end, attrs, |_| true);
unclosed_delims.append(&mut this.unclosed_delims);
item
})?;
self.unclosed_delims.append(&mut unclosed_delims);
// See `parse_item` for why this clause is here.
if !item.attrs.iter().any(|attr| attr.style == AttrStyle::Inner) {
item.tokens = Some(tokens);
}
Ok(item)
}
/// Parses defaultness (i.e., `default` or nothing).
fn parse_defaultness(&mut self) -> Defaultness {
// `pub` is included for better error messages
@ -802,20 +783,30 @@ fn parse_item_trait(&mut self, lo: Span, unsafety: Unsafety) -> PResult<'a, Item
}
}
/// Parses the items in a trait declaration.
pub fn parse_impl_item(&mut self, at_end: &mut bool) -> PResult<'a, AssocItem> {
maybe_whole!(self, NtImplItem, |x| x);
self.parse_assoc_item(at_end, |_| true)
}
pub fn parse_trait_item(&mut self, at_end: &mut bool) -> PResult<'a, AssocItem> {
maybe_whole!(self, NtTraitItem, |x| x);
// This is somewhat dubious; We don't want to allow
// param names to be left off if there is a definition...
//
// We don't allow param names to be left off in edition 2018.
self.parse_assoc_item(at_end, |t| t.span.rust_2018())
}
/// Parses associated items.
fn parse_assoc_item(
&mut self,
at_end: &mut bool,
is_name_required: fn(&token::Token) -> bool,
) -> PResult<'a, AssocItem> {
let attrs = self.parse_outer_attributes()?;
let mut unclosed_delims = vec![];
let (mut item, tokens) = self.collect_tokens(|this| {
// This is somewhat dubious; We don't want to allow
// param names to be left off if there is a definition...
//
// We don't allow param names to be left off in edition 2018.
//
// FIXME(Centril): bake closure into param parsing.
// Also add semantic restrictions and add tests.
let item = this.parse_assoc_item(at_end, attrs, |t| t.span.rust_2018());
let item = this.parse_assoc_item_(at_end, attrs, is_name_required);
unclosed_delims.append(&mut this.unclosed_delims);
item
})?;
@ -827,7 +818,7 @@ pub fn parse_trait_item(&mut self, at_end: &mut bool) -> PResult<'a, AssocItem>
Ok(item)
}
fn parse_assoc_item(
fn parse_assoc_item_(
&mut self,
at_end: &mut bool,
mut attrs: Vec<Attribute>,