mod consts; mod nominal; mod traits; mod use_item; pub(crate) use self::{ expressions::{match_arm_list, record_field_list}, nominal::{enum_variant_list, record_field_def_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 !p.at(EOF) && !(stop_on_r_curly && p.at(T!['}'])) { 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 ]; 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(); 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 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; } // 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; } 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![fn] | T![type] => { 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 // unsafe async fn foo() {} // const unsafe fn bar() {} // test_err wrong_order_fns // async unsafe fn foo() {} // unsafe const fn bar() {} T![fn] => { fn_def(p, flavor); 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() {} // } // test unsafe_default_impl // unsafe default impl Foo {} T![impl] => { traits::impl_block(p); m.complete(p, IMPL_BLOCK); } // 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, // } nominal::struct_def(p, m, T![struct]); } IDENT if p.at_contextual_kw("union") && p.nth(1) == IDENT => { // test union_items // union Foo {} // union Foo { // a: i32, // b: f32, // } nominal::struct_def(p, m, T![union]); } T![enum] => nominal::enum_def(p, m), T![use] => use_item::use_item(p, m), T![const] if (la == IDENT || 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(); assert!(p.at(T![crate])); p.bump(); 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(); mod_contents(p, true); p.expect(T!['}']); m.complete(p, EXTERN_ITEM_LIST); } fn fn_def(p: &mut Parser, flavor: ItemFlavor) { assert!(p.at(T![fn])); p.bump(); name_r(p, ITEM_RECOVERY_SET); // test function_type_params // fn foo(){} type_params::opt_type_param_list(p); if p.at(T!['(']) { match flavor { ItemFlavor::Mod => params::param_list(p), ItemFlavor::Trait => params::param_list_opt_patterns(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() where T: Copy {} type_params::opt_where_clause(p); // test fn_decl // trait T { fn foo(); } if p.at(T![;]) { p.bump(); } else { expressions::block(p) } } // test type_item // type Foo = Bar; fn type_def(p: &mut Parser, m: Marker) { assert!(p.at(T![type])); p.bump(); name(p); // test type_item_type_params // type Result = (); 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(); 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(); mod_contents(p, true); p.expect(T!['}']); m.complete(p, ITEM_LIST); } 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); } 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(); 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_raw(), } } p.expect(closing_paren_kind); m.complete(p, TOKEN_TREE); }