use super::*; mod consts; mod structs; mod traits; mod use_item; // 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(R_CURLY)) { item_or_macro(p, stop_on_r_curly) } } pub(super) fn item_or_macro(p: &mut Parser, stop_on_r_curly: bool) { let m = p.start(); match maybe_item(p) { MaybeItem::Item(kind) => { m.complete(p, kind); } MaybeItem::None => { if paths::is_path_start(p) { match macro_call(p) { MacroFlavor::Curly => (), MacroFlavor::NonCurly => { p.expect(SEMI); } } m.complete(p, MACRO_CALL); } else { m.abandon(p); if p.at(L_CURLY) { error_block(p, "expected an item"); } else if !p.at(EOF) && !(stop_on_r_curly && p.at(R_CURLY)) { p.err_and_bump("expected an item"); } else { p.error("expected an item"); } } } MaybeItem::Modifiers => { p.error("expected fn, trait or impl"); m.complete(p, ERROR); } } } pub(super) const ITEM_FIRST: TokenSet = token_set![EXTERN_KW, MOD_KW, USE_KW, STRUCT_KW, ENUM_KW, FN_KW, PUB_KW, POUND]; pub(super) enum MaybeItem { None, Item(SyntaxKind), Modifiers, } pub(super) fn maybe_item(p: &mut Parser) -> MaybeItem { attributes::outer_attributes(p); visibility(p); if let Some(kind) = items_without_modifiers(p) { return MaybeItem::Item(kind); } let mut has_mods = false; // modifiers has_mods |= p.eat(CONST_KW); // test unsafe_block_in_mod // fn foo(){} unsafe { } fn bar(){} if p.at(UNSAFE_KW) && p.nth(1) != L_CURLY { p.eat(UNSAFE_KW); has_mods = true; } if p.at(EXTERN_KW) { has_mods = true; abi(p); } if p.at(IDENT) && p.at_contextual_kw("auto") && p.nth(1) == TRAIT_KW { p.bump_remap(AUTO_KW); has_mods = true; } if p.at(IDENT) && p.at_contextual_kw("default") && p.nth(1) == IMPL_KW { p.bump_remap(DEFAULT_KW); has_mods = true; } // items let kind = match p.current() { // 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() {} FN_KW => { fn_item(p); FN_ITEM } // test unsafe_trait // unsafe trait T {} // test auto_trait // auto trait T {} // test unsafe_auto_trait // unsafe auto trait T {} TRAIT_KW => { traits::trait_item(p); TRAIT_ITEM } // test unsafe_impl // unsafe impl Foo {} // test default_impl // default impl Foo {} // test unsafe_default_impl // unsafe default impl Foo {} IMPL_KW => { traits::impl_item(p); IMPL_ITEM } _ => return if has_mods { MaybeItem::Modifiers } else { MaybeItem::None } }; MaybeItem::Item(kind) } fn items_without_modifiers(p: &mut Parser) -> Option { let la = p.nth(1); let kind = match p.current() { // test extern_crate // extern crate foo; EXTERN_KW if la == CRATE_KW => { extern_crate_item(p); EXTERN_CRATE_ITEM } TYPE_KW => { type_item(p); TYPE_ITEM } MOD_KW => { mod_item(p); MOD_ITEM } STRUCT_KW => { structs::struct_item(p); if p.at(SEMI) { p.err_and_bump( "expected item, found `;`\n\ consider removing this semicolon" ); } STRUCT_ITEM } ENUM_KW => { structs::enum_item(p); ENUM_ITEM } USE_KW => { use_item::use_item(p); USE_ITEM } CONST_KW if (la == IDENT || la == MUT_KW) => { consts::const_item(p); CONST_ITEM } STATIC_KW => { consts::static_item(p); STATIC_ITEM } // test extern_block // extern {} EXTERN_KW if la == L_CURLY || ((la == STRING || la == RAW_STRING) && p.nth(2) == L_CURLY) => { abi(p); extern_block(p); EXTERN_BLOCK_EXPR } _ => return None, }; Some(kind) } fn extern_crate_item(p: &mut Parser) { assert!(p.at(EXTERN_KW)); p.bump(); assert!(p.at(CRATE_KW)); p.bump(); name(p); alias(p); p.expect(SEMI); } fn extern_block(p: &mut Parser) { assert!(p.at(L_CURLY)); p.bump(); p.expect(R_CURLY); } fn fn_item(p: &mut Parser) { assert!(p.at(FN_KW)); p.bump(); name(p); // test fn_item_type_params // fn foo(){} type_params::type_param_list(p); if p.at(L_PAREN) { params::param_list(p); } else { p.error("expected function arguments"); } // test fn_item_ret_type // fn foo() {} // fn bar() -> () {} fn_ret_type(p); // test fn_item_where_clause // fn foo() where T: Copy {} type_params::where_clause(p); expressions::block(p); } // test type_item // type Foo = Bar; fn type_item(p: &mut Parser) { assert!(p.at(TYPE_KW)); p.bump(); name(p); // test type_item_type_params // type Result = (); type_params::type_param_list(p); // test type_item_where_clause // type Foo where Foo: Copy = (); type_params::where_clause(p); p.expect(EQ); types::type_(p); p.expect(SEMI); } fn mod_item(p: &mut Parser) { assert!(p.at(MOD_KW)); p.bump(); name(p); if !p.eat(SEMI) { if p.expect(L_CURLY) { mod_contents(p, true); p.expect(R_CURLY); } } } pub(super) enum MacroFlavor { Curly, NonCurly, } fn macro_call(p: &mut Parser) -> MacroFlavor { assert!(paths::is_path_start(p)); paths::use_path(p); macro_call_after_excl(p) } pub(super) fn macro_call_after_excl(p: &mut Parser) -> MacroFlavor { p.expect(EXCL); p.eat(IDENT); let flavor = match p.current() { L_CURLY => { token_tree(p); MacroFlavor::Curly } L_PAREN | L_BRACK => { token_tree(p); MacroFlavor::NonCurly } _ => { p.error("expected `{`, `[`, `(`"); MacroFlavor::NonCurly }, }; flavor } fn token_tree(p: &mut Parser) { let closing_paren_kind = match p.current() { L_CURLY => R_CURLY, L_PAREN => R_PAREN, L_BRACK => R_BRACK, _ => unreachable!(), }; p.bump(); while !p.at(EOF) && !p.at(closing_paren_kind) { match p.current() { L_CURLY | L_PAREN | L_BRACK => token_tree(p), R_CURLY | R_PAREN | R_BRACK => p.err_and_bump("unmatched brace"), _ => p.bump() } }; p.expect(closing_paren_kind); }