bjoernager/rust
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syntax: extract parse_derive_paths

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This commit is contained in:
Mazdak Farrokhzad 2019-10-08 09:06:07 +02:00
parent 9dba03f6cd
commit 7d7969d065
3 changed files with 20 additions and 19 deletions
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17
src/libsyntax/parse/parser/path.rs
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@ -111,7 +111,7 @@ impl<'a> Parser<'a> {
/// Like `parse_path`, but also supports parsing `Word` meta items into paths for
/// backwards-compatibility. This is used when parsing derive macro paths in `#[derive]`
/// attributes.
pub fn parse_path_allowing_meta(&mut self, style: PathStyle) -> PResult<'a, Path> {
fn parse_path_allowing_meta(&mut self, style: PathStyle) -> PResult<'a, Path> {
let meta_ident = match self.token.kind {
token::Interpolated(ref nt) => match **nt {
token::NtMeta(ref item) => match item.tokens.is_empty() {
@ -129,6 +129,21 @@ impl<'a> Parser<'a> {
self.parse_path(style)
}
/// Parse a list of paths inside `#[derive(path_0, ..., path_n)]`.
crate fn parse_derive_paths(&mut self) -> PResult<'a, Vec<Path>> {
self.expect(&token::OpenDelim(token::Paren))?;
let mut list = Vec::new();
while !self.eat(&token::CloseDelim(token::Paren)) {
let path = self.parse_path_allowing_meta(PathStyle::Mod)?;
list.push(path);
if !self.eat(&token::Comma) {
self.expect(&token::CloseDelim(token::Paren))?;
break
}
}
Ok(list)
}
crate fn parse_path_segments(
&mut self,
segments: &mut Vec<PathSegment>,