use super::*; pub(super) fn type_(p: &mut Parser) { match p.current() { L_PAREN => paren_or_tuple_type(p), EXCL => never_type(p), STAR => pointer_type(p), L_BRACK => array_or_slice_type(p), AMP => reference_type(p), UNDERSCORE => placeholder_type(p), FN_KW | UNSAFE_KW | EXTERN_KW => fn_pointer_type(p), FOR_KW => for_type(p), IMPL_KW => impl_trait_type(p), _ if paths::is_path_start(p) => path_type(p), _ => { p.error("expected type"); } } } pub(super) fn ascription(p: &mut Parser) { p.expect(COLON); type_(p) } fn type_no_plus(p: &mut Parser) { type_(p); } fn paren_or_tuple_type(p: &mut Parser) { assert!(p.at(L_PAREN)); let m = p.start(); p.bump(); let mut n_types: u32 = 0; let mut trailing_comma: bool = false; while !p.at(EOF) && !p.at(R_PAREN) { n_types += 1; type_(p); if p.eat(COMMA) { trailing_comma = true; } else { trailing_comma = false; break; } } p.expect(R_PAREN); let kind = if n_types == 1 && !trailing_comma { // test paren_type // type T = (i32); PAREN_TYPE } else { // test unit_type // type T = (); // test singleton_tuple_type // type T = (i32,); TUPLE_TYPE }; m.complete(p, kind); } // test never_type // type Never = !; fn never_type(p: &mut Parser) { assert!(p.at(EXCL)); let m = p.start(); p.bump(); m.complete(p, NEVER_TYPE); } fn pointer_type(p: &mut Parser) { assert!(p.at(STAR)); let m = p.start(); p.bump(); match p.current() { // test pointer_type_mut // type M = *mut (); // type C = *mut (); MUT_KW | CONST_KW => p.bump(), _ => { // test pointer_type_no_mutability // type T = *(); p.error( "expected mut or const in raw pointer type \ (use `*mut T` or `*const T` as appropriate)", ); } }; type_no_plus(p); m.complete(p, POINTER_TYPE); } fn array_or_slice_type(p: &mut Parser) { assert!(p.at(L_BRACK)); let m = p.start(); p.bump(); type_(p); let kind = match p.current() { // test slice_type // type T = [()]; R_BRACK => { p.bump(); SLICE_TYPE } // test array_type // type T = [(); 92]; SEMI => { p.bump(); expressions::expr(p); p.expect(R_BRACK); ARRAY_TYPE } // test array_type_missing_semi // type T = [() 92]; _ => { p.error("expected `;` or `]`"); SLICE_TYPE } }; m.complete(p, kind); } // test reference_type; // type A = &(); // type B = &'static (); // type C = &mut (); fn reference_type(p: &mut Parser) { assert!(p.at(AMP)); let m = p.start(); p.bump(); p.eat(LIFETIME); p.eat(MUT_KW); type_no_plus(p); m.complete(p, REFERENCE_TYPE); } // test placeholder_type // type Placeholder = _; fn placeholder_type(p: &mut Parser) { assert!(p.at(UNDERSCORE)); let m = p.start(); p.bump(); m.complete(p, PLACEHOLDER_TYPE); } // test fn_pointer_type // type A = fn(); // type B = unsafe fn(); // type C = unsafe extern "C" fn(); fn fn_pointer_type(p: &mut Parser) { let m = p.start(); p.eat(UNSAFE_KW); if p.at(EXTERN_KW) { abi(p); } // test fn_pointer_type_missing_fn // type F = unsafe (); if !p.eat(FN_KW) { m.abandon(p); p.error("expected `fn`"); return; } params::param_list(p); // test fn_pointer_type_with_ret // type F = fn() -> (); fn_ret_type(p); m.complete(p, FN_POINTER_TYPE); } // test for_type // type A = for<'a> fn() -> (); fn for_type(p: &mut Parser) { assert!(p.at(FOR_KW)); let m = p.start(); p.bump(); type_params::type_param_list(p); type_(p); m.complete(p, FOR_TYPE); } // test impl_trait_type // type A = impl Iterator> + 'a; fn impl_trait_type(p: &mut Parser) { assert!(p.at(IMPL_KW)); let m = p.start(); p.bump(); type_params::bounds_without_colon(p); m.complete(p, IMPL_TRAIT_TYPE); } // test path_type // type A = Foo; // type B = ::Foo; // type C = self::Foo; // type D = super::Foo; fn path_type(p: &mut Parser) { assert!(paths::is_path_start(p)); let m = p.start(); paths::type_path(p); m.complete(p, PATH_TYPE); }