1 //! FIXME: write short doc here
9 adt::{record_field_list, variant_list},
10 expressions::{match_arm_list, record_expr_field_list},
11 traits::assoc_item_list,
12 use_item::use_tree_list,
18 // macro_rules! foo {}
22 pub(super) fn mod_contents(p: &mut Parser, stop_on_r_curly: bool) {
23 attributes::inner_attrs(p);
24 while !(stop_on_r_curly && p.at(T!['}']) || p.at(EOF)) {
25 item_or_macro(p, stop_on_r_curly)
29 pub(super) const ITEM_RECOVERY_SET: TokenSet = TokenSet::new(&[
46 pub(super) fn item_or_macro(p: &mut Parser, stop_on_r_curly: bool) {
48 attributes::outer_attrs(p);
49 let m = match maybe_item(p, m) {
53 "expected item, found `;`\n\
54 consider removing this semicolon",
61 if paths::is_use_path_start(p) {
63 BlockLike::Block => (),
64 BlockLike::NotBlock => {
68 m.complete(p, MACRO_CALL);
72 error_block(p, "expected an item");
73 } else if p.at(T!['}']) && !stop_on_r_curly {
75 p.error("unmatched `}`");
78 } else if !p.at(EOF) && !p.at(T!['}']) {
79 p.err_and_bump("expected an item");
81 p.error("expected an item");
86 pub(super) fn maybe_item(p: &mut Parser, m: Marker) -> Result<(), Marker> {
88 // fn foo() { pub 92; }
89 let has_visibility = opt_visibility(p);
91 let m = match items_without_modifiers(p, m) {
92 Ok(()) => return Ok(()),
96 let mut has_mods = false;
99 has_mods |= p.eat(T![const]);
101 // test_err async_without_semicolon
102 // fn foo() { let _ = async {} }
103 if p.at(T![async]) && p.nth(1) != T!['{'] && p.nth(1) != T![move] && p.nth(1) != T![|] {
108 // test_err unsafe_block_in_mod
109 // fn foo(){} unsafe { } fn bar(){}
110 if p.at(T![unsafe]) && p.nth(1) != T!['{'] {
115 if p.at(T![extern]) {
119 if p.at(IDENT) && p.at_contextual_kw("auto") && p.nth(1) == T![trait] {
120 p.bump_remap(T![auto]);
125 // default impl T for Foo {}
126 if p.at(IDENT) && p.at_contextual_kw("default") {
128 T![fn] | T![type] | T![const] | T![impl] => {
129 p.bump_remap(T![default]);
133 // test default_unsafe_item
134 // default unsafe impl T for Foo {
135 // default unsafe fn foo() {}
137 if matches!(p.nth(2), T![impl] | T![fn]) {
138 p.bump_remap(T![default]);
147 // test existential_type
148 // existential type Foo: Fn() -> usize;
149 if p.at(IDENT) && p.at_contextual_kw("existential") && p.nth(1) == T![type] {
150 p.bump_remap(T![existential]);
167 m.complete(p, TRAIT);
185 if !has_visibility && !has_mods {
189 p.error("expected existential, fn, trait or impl");
191 p.error("expected an item");
193 m.complete(p, ERROR);
200 fn items_without_modifiers(p: &mut Parser, m: Marker) -> Result<(), Marker> {
205 T![extern] if la == T![crate] => extern_crate(p, m),
209 T![mod] => mod_item(p, m),
215 // struct Foo(String, usize);
222 // test pub_macro_def
223 // pub macro m($:ident) {}
227 IDENT if p.at_contextual_kw("union") && p.nth(1) == IDENT => {
236 T![enum] => adt::enum_(p, m),
237 T![use] => use_item::use_(p, m),
238 T![const] if (la == IDENT || la == T![_] || la == T![mut]) => consts::konst(p, m),
239 T![static] => consts::static_(p, m),
242 T![extern] if la == T!['{'] || (la == STRING && p.nth(2) == T!['{']) => {
245 m.complete(p, EXTERN_BLOCK);
252 fn extern_crate(p: &mut Parser, m: Marker) {
253 assert!(p.at(T![extern]));
255 assert!(p.at(T![crate]));
266 m.complete(p, EXTERN_CRATE);
269 pub(crate) fn extern_item_list(p: &mut Parser) {
270 assert!(p.at(T!['{']));
273 mod_contents(p, true);
275 m.complete(p, EXTERN_ITEM_LIST);
278 fn fn_(p: &mut Parser) {
279 assert!(p.at(T![fn]));
282 name_r(p, ITEM_RECOVERY_SET);
283 // test function_type_params
284 // fn foo<T: Clone + Copy>(){}
285 type_params::opt_generic_param_list(p);
288 params::param_list_fn_def(p);
290 p.error("expected function arguments");
292 // test function_ret_type
297 // test function_where_clause
298 // fn foo<T>() where T: Copy {}
299 type_params::opt_where_clause(p);
302 // trait T { fn foo(); }
306 expressions::block_expr(p)
312 fn type_alias(p: &mut Parser, m: Marker) {
313 assert!(p.at(T![type]));
318 // test type_item_type_params
319 // type Result<T> = ();
320 type_params::opt_generic_param_list(p);
323 type_params::bounds(p);
326 // test type_item_where_clause
327 // type Foo where Foo: Copy = ();
328 type_params::opt_where_clause(p);
333 m.complete(p, TYPE_ALIAS);
336 pub(crate) fn mod_item(p: &mut Parser, m: Marker) {
337 assert!(p.at(T![mod]));
343 } else if !p.eat(T![;]) {
344 p.error("expected `;` or `{`");
346 m.complete(p, MODULE);
349 pub(crate) fn item_list(p: &mut Parser) {
350 assert!(p.at(T!['{']));
353 mod_contents(p, true);
355 m.complete(p, ITEM_LIST);
359 // macro m { ($i:ident) => {} }
360 // macro m($i:ident) {}
361 fn macro_def(p: &mut Parser, m: Marker) {
363 name_r(p, ITEM_RECOVERY_SET);
366 } else if !p.at(T!['(']) {
367 p.error("unmatched `(`");
372 T!['{'] | T!['['] | T!['('] => token_tree(p),
373 _ => p.error("expected `{`, `[`, `(`"),
375 m.complete(p, TOKEN_TREE);
378 m.complete(p, MACRO_DEF);
381 fn macro_call(p: &mut Parser) -> BlockLike {
382 assert!(paths::is_use_path_start(p));
384 macro_call_after_excl(p)
387 pub(super) fn macro_call_after_excl(p: &mut Parser) -> BlockLike {
392 // Special-case `macro_rules! try`.
393 // This is a hack until we do proper edition support
395 // test try_macro_rules
396 // macro_rules! try { () => {} }
408 T!['('] | T!['['] => {
413 p.error("expected `{`, `[`, `(`");
419 pub(crate) fn token_tree(p: &mut Parser) {
420 let closing_paren_kind = match p.current() {
428 while !p.at(EOF) && !p.at(closing_paren_kind) {
430 T!['{'] | T!['('] | T!['['] => token_tree(p),
432 p.error("unmatched `}`");
433 m.complete(p, TOKEN_TREE);
436 T![')'] | T![']'] => p.err_and_bump("unmatched brace"),
440 p.expect(closing_paren_kind);
441 m.complete(p, TOKEN_TREE);