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-rw-r--r--crates/libsyntax2/src/grammar/type_params.rs136
1 files changed, 0 insertions, 136 deletions
diff --git a/crates/libsyntax2/src/grammar/type_params.rs b/crates/libsyntax2/src/grammar/type_params.rs
deleted file mode 100644
index 79bc95ce4..000000000
--- a/crates/libsyntax2/src/grammar/type_params.rs
+++ /dev/null
@@ -1,136 +0,0 @@
1use super::*;
2
3pub(super) fn opt_type_param_list(p: &mut Parser) {
4 if !p.at(L_ANGLE) {
5 return;
6 }
7 let m = p.start();
8 p.bump();
9
10 while !p.at(EOF) && !p.at(R_ANGLE) {
11 match p.current() {
12 LIFETIME => lifetime_param(p),
13 IDENT => type_param(p),
14 _ => p.err_and_bump("expected type parameter"),
15 }
16 if !p.at(R_ANGLE) && !p.expect(COMMA) {
17 break;
18 }
19 }
20 p.expect(R_ANGLE);
21 m.complete(p, TYPE_PARAM_LIST);
22
23 fn lifetime_param(p: &mut Parser) {
24 assert!(p.at(LIFETIME));
25 let m = p.start();
26 p.bump();
27 if p.at(COLON) {
28 lifetime_bounds(p);
29 }
30 m.complete(p, LIFETIME_PARAM);
31 }
32
33 fn type_param(p: &mut Parser) {
34 assert!(p.at(IDENT));
35 let m = p.start();
36 name(p);
37 if p.at(COLON) {
38 bounds(p);
39 }
40 // test type_param_default
41 // struct S<T = i32>;
42 if p.at(EQ) {
43 p.bump();
44 types::type_(p)
45 }
46 m.complete(p, TYPE_PARAM);
47 }
48}
49
50// test type_param_bounds
51// struct S<T: 'a + ?Sized + (Copy)>;
52pub(super) fn bounds(p: &mut Parser) {
53 assert!(p.at(COLON));
54 p.bump();
55 bounds_without_colon(p);
56}
57
58fn lifetime_bounds(p: &mut Parser) {
59 assert!(p.at(COLON));
60 p.bump();
61 while p.at(LIFETIME) {
62 p.bump();
63 if !p.eat(PLUS) {
64 break;
65 }
66 }
67}
68
69pub(super) fn bounds_without_colon(p: &mut Parser) {
70 loop {
71 let has_paren = p.eat(L_PAREN);
72 p.eat(QUESTION);
73 match p.current() {
74 LIFETIME => p.bump(),
75 FOR_KW => {
76 types::for_type(p)
77 }
78 _ if paths::is_path_start(p) => {
79 types::path_type(p)
80 }
81 _ => break,
82 }
83 if has_paren {
84 p.expect(R_PAREN);
85 }
86 if !p.eat(PLUS) {
87 break;
88 }
89 }
90}
91
92// test where_clause
93// fn foo()
94// where
95// 'a: 'b + 'c,
96// T: Clone + Copy + 'static,
97// Iterator::Item: 'a,
98// {}
99pub(super) fn opt_where_clause(p: &mut Parser) {
100 if !p.at(WHERE_KW) {
101 return;
102 }
103 let m = p.start();
104 p.bump();
105 loop {
106 if !(paths::is_path_start(p) || p.current() == LIFETIME) {
107 break
108 }
109 where_predicate(p);
110 if p.current() != L_CURLY && p.current() != SEMI {
111 p.expect(COMMA);
112 }
113 }
114 m.complete(p, WHERE_CLAUSE);
115}
116
117fn where_predicate(p: &mut Parser) {
118 let m = p.start();
119 if p.at(LIFETIME) {
120 p.eat(LIFETIME);
121 if p.at(COLON) {
122 lifetime_bounds(p)
123 } else {
124 p.error("expected colon")
125 }
126 } else {
127 types::path_type(p);
128 if p.at(COLON) {
129 bounds(p);
130 } else {
131 p.error("expected colon")
132 }
133
134 }
135 m.complete(p, WHERE_PRED);
136}