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Merge #987

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987: Refactor maybe_item to use Marker argument r=pcpthm a=pcpthm

As suggested at <https://github.com/rust-analyzer/rust-analyzer/pull/980#issuecomment-473659745>.
For expression paring functions, changing signature
- from `fn(&mut Parser) -> Option<CompletedMarker>` to `fn(&mut Parser, Marker) -> Result<CompletedMarker, Marker>`
- from `fn(&mut Parser) -> CompletedMarker` to `fn(&mut Parser, Marker) -> CompletedMarker`
is my plan.

Co-authored-by: pcpthm <pcpthm@gmail.com>
This commit is contained in:
bors[bot] 2019-03-18 04:16:20 +00:00
commit 4c1ea0b628
2 changed files with 70 additions and 84 deletions
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16
crates/ra_parser/src/grammar/expressions.rs
View File

@ -62,17 +62,13 @@ pub(crate) fn expr_block_contents(p: &mut Parser) {
continue;
}
match items::maybe_item(p, items::ItemFlavor::Mod) {
items::MaybeItem::Item(kind) => {
m.complete(p, kind);
}
items::MaybeItem::Modifiers => {
m.abandon(p);
p.error("expected an item");
}
let m = match items::maybe_item(p, m, items::ItemFlavor::Mod) {
Ok(()) => continue,
Err(m) => m,
};
// test pub_expr
// fn foo() { pub 92; } //FIXME
items::MaybeItem::None => {
if has_attrs {
m.abandon(p);
p.error("expected a let statement or an item after attributes in block");
@ -104,8 +100,6 @@ pub(crate) fn expr_block_contents(p: &mut Parser) {
}
}
}
}
}
// test let_stmt;
// fn foo() {

46
crates/ra_parser/src/grammar/items.rs
View File

@ -37,11 +37,10 @@ pub(super) const ITEM_RECOVERY_SET: TokenSet = token_set![
pub(super) fn item_or_macro(p: &mut Parser, stop_on_r_curly: bool, flavor: ItemFlavor) {
let m = p.start();
attributes::outer_attributes(p);
match maybe_item(p, flavor) {
MaybeItem::Item(kind) => {
m.complete(p, kind);
}
MaybeItem::None => {
let m = match maybe_item(p, m, flavor) {
Ok(()) => return,
Err(m) => m,
};
if paths::is_path_start(p) {
match macro_call(p) {
BlockLike::Block => (),
@ -66,23 +65,12 @@ pub(super) fn item_or_macro(p: &mut Parser, stop_on_r_curly: bool, flavor: ItemF
}
}
}
MaybeItem::Modifiers => {
p.error("expected fn, trait or impl");
m.complete(p, ERROR);
}
}
}
pub(super) enum MaybeItem {
None,
Item(SyntaxKind),
Modifiers,
}
pub(super) fn maybe_item(p: &mut Parser, flavor: ItemFlavor) -> MaybeItem {
pub(super) fn maybe_item(p: &mut Parser, m: Marker, flavor: ItemFlavor) -> Result<(), Marker> {
opt_visibility(p);
if let Some(kind) = items_without_modifiers(p) {
return MaybeItem::Item(kind);
m.complete(p, kind);
return Ok(());
}
let mut has_mods = false;
@ -115,7 +103,7 @@ pub(super) fn maybe_item(p: &mut Parser, flavor: ItemFlavor) -> MaybeItem {
}
// items
let kind = match p.current() {
match p.current() {
// test async_fn
// async fn foo() {}
@ -135,7 +123,7 @@ pub(super) fn maybe_item(p: &mut Parser, flavor: ItemFlavor) -> MaybeItem {
// unsafe fn foo() {}
FN_KW => {
fn_def(p, flavor);
FN_DEF
m.complete(p, FN_DEF);
}
// test unsafe_trait
@ -148,7 +136,7 @@ pub(super) fn maybe_item(p: &mut Parser, flavor: ItemFlavor) -> MaybeItem {
// unsafe auto trait T {}
TRAIT_KW => {
traits::trait_def(p);
TRAIT_DEF
m.complete(p, TRAIT_DEF);
}
// test unsafe_impl
@ -161,14 +149,18 @@ pub(super) fn maybe_item(p: &mut Parser, flavor: ItemFlavor) -> MaybeItem {
// unsafe default impl Foo {}
IMPL_KW => {
traits::impl_block(p);
IMPL_BLOCK
m.complete(p, IMPL_BLOCK);
}
_ => {
return if has_mods { MaybeItem::Modifiers } else { MaybeItem::None };
if !has_mods {
return Err(m);
} else {
p.error("expected fn, trait or impl");
m.complete(p, ERROR);
}
};
MaybeItem::Item(kind)
}
}
Ok(())
}
fn items_without_modifiers(p: &mut Parser) -> Option<SyntaxKind> {