| //! FIXME: write short doc here |
| |
| mod consts; |
| mod adt; |
| mod traits; |
| mod use_item; |
| |
| pub(crate) use self::{ |
| adt::{enum_variant_list, record_field_def_list}, |
| expressions::{match_arm_list, record_field_list}, |
| traits::{impl_item_list, trait_item_list}, |
| use_item::use_tree_list, |
| }; |
| use super::*; |
| |
| // test mod_contents |
| // fn foo() {} |
| // macro_rules! foo {} |
| // foo::bar!(); |
| // super::baz! {} |
| // struct S; |
| pub(super) fn mod_contents(p: &mut Parser, stop_on_r_curly: bool) { |
| attributes::inner_attributes(p); |
| while !(stop_on_r_curly && p.at(T!['}']) || p.at(EOF)) { |
| item_or_macro(p, stop_on_r_curly, ItemFlavor::Mod) |
| } |
| } |
| |
| pub(super) enum ItemFlavor { |
| Mod, |
| Trait, |
| } |
| |
| pub(super) const ITEM_RECOVERY_SET: TokenSet = token_set![ |
| FN_KW, STRUCT_KW, ENUM_KW, IMPL_KW, TRAIT_KW, CONST_KW, STATIC_KW, LET_KW, MOD_KW, PUB_KW, |
| CRATE_KW, USE_KW, MACRO_KW |
| ]; |
| |
| pub(super) fn item_or_macro(p: &mut Parser, stop_on_r_curly: bool, flavor: ItemFlavor) { |
| let m = p.start(); |
| attributes::outer_attributes(p); |
| let m = match maybe_item(p, m, flavor) { |
| Ok(()) => { |
| if p.at(T![;]) { |
| p.err_and_bump( |
| "expected item, found `;`\n\ |
| consider removing this semicolon", |
| ); |
| } |
| return; |
| } |
| Err(m) => m, |
| }; |
| if paths::is_use_path_start(p) { |
| match macro_call(p) { |
| BlockLike::Block => (), |
| BlockLike::NotBlock => { |
| p.expect(T![;]); |
| } |
| } |
| m.complete(p, MACRO_CALL); |
| } else { |
| m.abandon(p); |
| if p.at(T!['{']) { |
| error_block(p, "expected an item"); |
| } else if p.at(T!['}']) && !stop_on_r_curly { |
| let e = p.start(); |
| p.error("unmatched `}`"); |
| p.bump(T!['}']); |
| e.complete(p, ERROR); |
| } else if !p.at(EOF) && !p.at(T!['}']) { |
| p.err_and_bump("expected an item"); |
| } else { |
| p.error("expected an item"); |
| } |
| } |
| } |
| |
| pub(super) fn maybe_item(p: &mut Parser, m: Marker, flavor: ItemFlavor) -> Result<(), Marker> { |
| // test_err pub_expr |
| // fn foo() { pub 92; } |
| let has_visibility = opt_visibility(p); |
| |
| let m = match items_without_modifiers(p, m) { |
| Ok(()) => return Ok(()), |
| Err(m) => m, |
| }; |
| |
| let mut has_mods = false; |
| |
| // modifiers |
| has_mods |= p.eat(T![const]); |
| |
| // test_err async_without_semicolon |
| // fn foo() { let _ = async {} } |
| if p.at(T![async]) && p.nth(1) != T!['{'] && p.nth(1) != T![move] && p.nth(1) != T![|] { |
| p.eat(T![async]); |
| has_mods = true; |
| } |
| |
| // test_err unsafe_block_in_mod |
| // fn foo(){} unsafe { } fn bar(){} |
| if p.at(T![unsafe]) && p.nth(1) != T!['{'] { |
| p.eat(T![unsafe]); |
| has_mods = true; |
| } |
| |
| if p.at(T![extern]) { |
| has_mods = true; |
| abi(p); |
| } |
| if p.at(IDENT) && p.at_contextual_kw("auto") && p.nth(1) == T![trait] { |
| p.bump_remap(T![auto]); |
| has_mods = true; |
| } |
| |
| if p.at(IDENT) |
| && p.at_contextual_kw("default") |
| && (match p.nth(1) { |
| T![impl] => true, |
| T![unsafe] => { |
| // test default_unsafe_impl |
| // default unsafe impl Foo {} |
| |
| // test default_unsafe_fn |
| // impl T for Foo { |
| // default unsafe fn foo() {} |
| // } |
| if p.nth(2) == T![impl] || p.nth(2) == T![fn] { |
| p.bump_remap(T![default]); |
| p.bump(T![unsafe]); |
| has_mods = true; |
| } |
| false |
| } |
| T![fn] | T![type] | T![const] => { |
| if let ItemFlavor::Mod = flavor { |
| true |
| } else { |
| false |
| } |
| } |
| _ => false, |
| }) |
| { |
| p.bump_remap(T![default]); |
| has_mods = true; |
| } |
| if p.at(IDENT) && p.at_contextual_kw("existential") && p.nth(1) == T![type] { |
| p.bump_remap(T![existential]); |
| has_mods = true; |
| } |
| |
| // items |
| match p.current() { |
| // test async_fn |
| // async fn foo() {} |
| |
| // test extern_fn |
| // extern fn foo() {} |
| |
| // test const_fn |
| // const fn foo() {} |
| |
| // test const_unsafe_fn |
| // const unsafe fn foo() {} |
| |
| // test unsafe_extern_fn |
| // unsafe extern "C" fn foo() {} |
| |
| // test unsafe_fn |
| // unsafe fn foo() {} |
| |
| // test combined_fns |
| // async unsafe fn foo() {} |
| // const unsafe fn bar() {} |
| |
| // test_err wrong_order_fns |
| // unsafe async fn foo() {} |
| // unsafe const fn bar() {} |
| T![fn] => { |
| fn_def(p); |
| m.complete(p, FN_DEF); |
| } |
| |
| // test unsafe_trait |
| // unsafe trait T {} |
| |
| // test auto_trait |
| // auto trait T {} |
| |
| // test unsafe_auto_trait |
| // unsafe auto trait T {} |
| T![trait] => { |
| traits::trait_def(p); |
| m.complete(p, TRAIT_DEF); |
| } |
| |
| // test unsafe_impl |
| // unsafe impl Foo {} |
| |
| // test default_impl |
| // default impl Foo {} |
| |
| // test_err default_fn_type |
| // trait T { |
| // default type T = Bar; |
| // default fn foo() {} |
| // } |
| |
| // test default_fn_type |
| // impl T for Foo { |
| // default type T = Bar; |
| // default fn foo() {} |
| // } |
| T![const] => { |
| consts::const_def(p, m); |
| } |
| |
| // test unsafe_default_impl |
| // unsafe default impl Foo {} |
| T![impl] => { |
| traits::impl_def(p); |
| m.complete(p, IMPL_DEF); |
| } |
| |
| // test existential_type |
| // existential type Foo: Fn() -> usize; |
| T![type] => { |
| type_def(p, m); |
| } |
| _ => { |
| if !has_visibility && !has_mods { |
| return Err(m); |
| } else { |
| if has_mods { |
| p.error("expected existential, fn, trait or impl"); |
| } else { |
| p.error("expected an item"); |
| } |
| m.complete(p, ERROR); |
| } |
| } |
| } |
| Ok(()) |
| } |
| |
| fn items_without_modifiers(p: &mut Parser, m: Marker) -> Result<(), Marker> { |
| let la = p.nth(1); |
| match p.current() { |
| // test extern_crate |
| // extern crate foo; |
| T![extern] if la == T![crate] => extern_crate_item(p, m), |
| T![type] => { |
| type_def(p, m); |
| } |
| T![mod] => mod_item(p, m), |
| T![struct] => { |
| // test struct_items |
| // struct Foo; |
| // struct Foo {} |
| // struct Foo(); |
| // struct Foo(String, usize); |
| // struct Foo { |
| // a: i32, |
| // b: f32, |
| // } |
| adt::struct_def(p, m); |
| } |
| // test pub_macro_def |
| // pub macro m($:ident) {} |
| T![macro] => { |
| macro_def(p, m); |
| } |
| IDENT if p.at_contextual_kw("union") && p.nth(1) == IDENT => { |
| // test union_items |
| // union Foo {} |
| // union Foo { |
| // a: i32, |
| // b: f32, |
| // } |
| adt::union_def(p, m); |
| } |
| T![enum] => adt::enum_def(p, m), |
| T![use] => use_item::use_item(p, m), |
| T![const] if (la == IDENT || la == T![_] || la == T![mut]) => consts::const_def(p, m), |
| T![static] => consts::static_def(p, m), |
| // test extern_block |
| // extern {} |
| T![extern] |
| if la == T!['{'] || ((la == STRING || la == RAW_STRING) && p.nth(2) == T!['{']) => |
| { |
| abi(p); |
| extern_item_list(p); |
| m.complete(p, EXTERN_BLOCK); |
| } |
| _ => return Err(m), |
| }; |
| Ok(()) |
| } |
| |
| fn extern_crate_item(p: &mut Parser, m: Marker) { |
| assert!(p.at(T![extern])); |
| p.bump(T![extern]); |
| assert!(p.at(T![crate])); |
| p.bump(T![crate]); |
| name_ref(p); |
| opt_alias(p); |
| p.expect(T![;]); |
| m.complete(p, EXTERN_CRATE_ITEM); |
| } |
| |
| pub(crate) fn extern_item_list(p: &mut Parser) { |
| assert!(p.at(T!['{'])); |
| let m = p.start(); |
| p.bump(T!['{']); |
| mod_contents(p, true); |
| p.expect(T!['}']); |
| m.complete(p, EXTERN_ITEM_LIST); |
| } |
| |
| fn fn_def(p: &mut Parser) { |
| assert!(p.at(T![fn])); |
| p.bump(T![fn]); |
| |
| name_r(p, ITEM_RECOVERY_SET); |
| // test function_type_params |
| // fn foo<T: Clone + Copy>(){} |
| type_params::opt_type_param_list(p); |
| |
| if p.at(T!['(']) { |
| params::param_list_fn_def(p); |
| } else { |
| p.error("expected function arguments"); |
| } |
| // test function_ret_type |
| // fn foo() {} |
| // fn bar() -> () {} |
| opt_fn_ret_type(p); |
| |
| // test function_where_clause |
| // fn foo<T>() where T: Copy {} |
| type_params::opt_where_clause(p); |
| |
| // test fn_decl |
| // trait T { fn foo(); } |
| if p.at(T![;]) { |
| p.bump(T![;]); |
| } else { |
| expressions::block_expr(p) |
| } |
| } |
| |
| // test type_item |
| // type Foo = Bar; |
| fn type_def(p: &mut Parser, m: Marker) { |
| assert!(p.at(T![type])); |
| p.bump(T![type]); |
| |
| name(p); |
| |
| // test type_item_type_params |
| // type Result<T> = (); |
| type_params::opt_type_param_list(p); |
| |
| if p.at(T![:]) { |
| type_params::bounds(p); |
| } |
| |
| // test type_item_where_clause |
| // type Foo where Foo: Copy = (); |
| type_params::opt_where_clause(p); |
| if p.eat(T![=]) { |
| types::type_(p); |
| } |
| p.expect(T![;]); |
| m.complete(p, TYPE_ALIAS_DEF); |
| } |
| |
| pub(crate) fn mod_item(p: &mut Parser, m: Marker) { |
| assert!(p.at(T![mod])); |
| p.bump(T![mod]); |
| |
| name(p); |
| if p.at(T!['{']) { |
| mod_item_list(p); |
| } else if !p.eat(T![;]) { |
| p.error("expected `;` or `{`"); |
| } |
| m.complete(p, MODULE); |
| } |
| |
| pub(crate) fn mod_item_list(p: &mut Parser) { |
| assert!(p.at(T!['{'])); |
| let m = p.start(); |
| p.bump(T!['{']); |
| mod_contents(p, true); |
| p.expect(T!['}']); |
| m.complete(p, ITEM_LIST); |
| } |
| |
| // test macro_def |
| // macro m { ($i:ident) => {} } |
| // macro m($i:ident) {} |
| fn macro_def(p: &mut Parser, m: Marker) { |
| p.expect(T![macro]); |
| name_r(p, ITEM_RECOVERY_SET); |
| if p.at(T!['{']) { |
| token_tree(p); |
| } else if !p.at(T!['(']) { |
| p.error("unmatched `(`"); |
| } else { |
| let m = p.start(); |
| token_tree(p); |
| match p.current() { |
| T!['{'] | T!['['] | T!['('] => token_tree(p), |
| _ => p.error("expected `{`, `[`, `(`"), |
| } |
| m.complete(p, TOKEN_TREE); |
| } |
| |
| m.complete(p, MACRO_DEF); |
| } |
| |
| fn macro_call(p: &mut Parser) -> BlockLike { |
| assert!(paths::is_use_path_start(p)); |
| paths::use_path(p); |
| macro_call_after_excl(p) |
| } |
| |
| pub(super) fn macro_call_after_excl(p: &mut Parser) -> BlockLike { |
| p.expect(T![!]); |
| if p.at(IDENT) { |
| name(p); |
| } |
| // Special-case `macro_rules! try`. |
| // This is a hack until we do proper edition support |
| |
| // test try_macro_rules |
| // macro_rules! try { () => {} } |
| if p.at(T![try]) { |
| let m = p.start(); |
| p.bump_remap(IDENT); |
| m.complete(p, NAME); |
| } |
| |
| match p.current() { |
| T!['{'] => { |
| token_tree(p); |
| BlockLike::Block |
| } |
| T!['('] | T!['['] => { |
| token_tree(p); |
| BlockLike::NotBlock |
| } |
| _ => { |
| p.error("expected `{`, `[`, `(`"); |
| BlockLike::NotBlock |
| } |
| } |
| } |
| |
| pub(crate) fn token_tree(p: &mut Parser) { |
| let closing_paren_kind = match p.current() { |
| T!['{'] => T!['}'], |
| T!['('] => T![')'], |
| T!['['] => T![']'], |
| _ => unreachable!(), |
| }; |
| let m = p.start(); |
| p.bump_any(); |
| while !p.at(EOF) && !p.at(closing_paren_kind) { |
| match p.current() { |
| T!['{'] | T!['('] | T!['['] => token_tree(p), |
| T!['}'] => { |
| p.error("unmatched `}`"); |
| m.complete(p, TOKEN_TREE); |
| return; |
| } |
| T![')'] | T![']'] => p.err_and_bump("unmatched brace"), |
| _ => p.bump_any(), |
| } |
| } |
| p.expect(closing_paren_kind); |
| m.complete(p, TOKEN_TREE); |
| } |