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1//! This is the actual "grammar" of the Rust language.
2//!
3//! Each function in this module and its children corresponds
4//! to a production of the format grammar. Submodules roughly
5//! correspond to different *areas* of the grammar. By convention,
6//! each submodule starts with `use super::*` import and exports
7//! "public" productions via `pub(super)`.
8//!
9//! See docs for `Parser` to learn about API, available to the grammar,
10//! and see docs for `Event` to learn how this actually manages to
11//! produce parse trees.
12//!
13//! Code in this module also contains inline tests, which start with
14//! `// test name-of-the-test` comment and look like this:
15//!
16//! ```
17//! // test function_with_zero_parameters
18//! // fn foo() {}
19//! ```
20//!
21//! After adding a new inline-test, run `cargo collect-tests` to extract
22//! it as a standalone text-fixture into `tests/data/parser/inline`, and
23//! run `cargo test` once to create the "gold" value.
24mod attributes;
25mod expressions;
26mod items;
27mod params;
28mod paths;
29mod patterns;
30mod type_args;
31mod type_params;
32mod types;
33
34use {
35 parser_api::{CompletedMarker, Parser, TokenSet},
36 SyntaxKind::{self, *},
37};
38
39pub(crate) fn file(p: &mut Parser) {
40 let file = p.start();
41 p.eat(SHEBANG);
42 items::mod_contents(p, false);
43 file.complete(p, FILE);
44}
45
46
47#[derive(Clone, Copy, PartialEq, Eq)]
48enum BlockLike {
49 Block,
50 NotBlock,
51}
52
53impl BlockLike {
54 fn is_block(self) -> bool { self == BlockLike::Block }
55}
56
57fn visibility(p: &mut Parser) {
58 match p.current() {
59 PUB_KW => {
60 let m = p.start();
61 p.bump();
62 if p.at(L_PAREN) {
63 match p.nth(1) {
64 // test crate_visibility
65 // pub(crate) struct S;
66 // pub(self) struct S;
67 // pub(self) struct S;
68 // pub(self) struct S;
69 CRATE_KW | SELF_KW | SUPER_KW => {
70 p.bump();
71 p.bump();
72 p.expect(R_PAREN);
73 }
74 IN_KW => {
75 p.bump();
76 p.bump();
77 paths::use_path(p);
78 p.expect(R_PAREN);
79 }
80 _ => (),
81 }
82 }
83 m.complete(p, VISIBILITY);
84 }
85 // test crate_keyword_vis
86 // crate fn main() { }
87 CRATE_KW => {
88 let m = p.start();
89 p.bump();
90 m.complete(p, VISIBILITY);
91 }
92 _ => (),
93 }
94}
95fn alias(p: &mut Parser) -> bool {
96 if p.at(AS_KW) {
97 let alias = p.start();
98 p.bump();
99 name(p);
100 alias.complete(p, ALIAS);
101 }
102 true //FIXME: return false if three are errors
103}
104
105fn abi(p: &mut Parser) {
106 assert!(p.at(EXTERN_KW));
107 let abi = p.start();
108 p.bump();
109 match p.current() {
110 STRING | RAW_STRING => p.bump(),
111 _ => (),
112 }
113 abi.complete(p, ABI);
114}
115
116fn fn_ret_type(p: &mut Parser) -> bool {
117 if p.at(THIN_ARROW) {
118 p.bump();
119 types::type_(p);
120 true
121 } else {
122 false
123 }
124}
125
126fn name(p: &mut Parser) {
127 if p.at(IDENT) {
128 let m = p.start();
129 p.bump();
130 m.complete(p, NAME);
131 } else {
132 p.error("expected a name");
133 }
134}
135
136fn name_ref(p: &mut Parser) {
137 if p.at(IDENT) {
138 let m = p.start();
139 p.bump();
140 m.complete(p, NAME_REF);
141 } else {
142 p.error("expected identifier");
143 }
144}
145
146fn error_block(p: &mut Parser, message: &str) {
147 assert!(p.at(L_CURLY));
148 let err = p.start();
149 p.error(message);
150 p.bump();
151 let mut level: u32 = 1;
152 while level > 0 && !p.at(EOF) {
153 match p.current() {
154 L_CURLY => level += 1,
155 R_CURLY => level -= 1,
156 _ => (),
157 }
158 p.bump();
159 }
160 err.complete(p, ERROR);
161}
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