rust-analyzer - Unnamed repository; edit this file 'description' to name the repository.


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166

use expect_test::expect;

use crate::{LexedStr, PrefixEntryPoint, Step, TopEntryPoint};

#[test]
fn vis() {
    check_prefix(PrefixEntryPoint::Vis, "pub(crate) fn foo() {}", "pub(crate)");
    check_prefix(PrefixEntryPoint::Vis, "fn foo() {}", "");
    check_prefix(PrefixEntryPoint::Vis, "pub(fn foo() {}", "pub");
    check_prefix(PrefixEntryPoint::Vis, "pub(crate fn foo() {}", "pub(crate");
    check_prefix(PrefixEntryPoint::Vis, "crate fn foo() {}", "crate");
}

#[test]
fn block() {
    check_prefix(PrefixEntryPoint::Block, "{}, 92", "{}");
    check_prefix(PrefixEntryPoint::Block, "{, 92)", "{, 92)");
    check_prefix(PrefixEntryPoint::Block, "()", "");
}

#[test]
fn stmt() {
    check_prefix(PrefixEntryPoint::Stmt, "92; fn", "92");
    check_prefix(PrefixEntryPoint::Stmt, "let _ = 92; 1", "let _ = 92");
    check_prefix(PrefixEntryPoint::Stmt, "pub fn f() {} = 92", "pub fn f() {}");
    check_prefix(PrefixEntryPoint::Stmt, "struct S;;", "struct S;");
    check_prefix(PrefixEntryPoint::Stmt, "fn f() {};", "fn f() {}");
    check_prefix(PrefixEntryPoint::Stmt, ";;;", ";");
    check_prefix(PrefixEntryPoint::Stmt, "+", "+");
    check_prefix(PrefixEntryPoint::Stmt, "@", "@");
    check_prefix(PrefixEntryPoint::Stmt, "loop {} - 1", "loop {}");
}

#[test]
fn pat() {
    check_prefix(PrefixEntryPoint::Pat, "x y", "x");
    check_prefix(PrefixEntryPoint::Pat, "fn f() {}", "fn");
    // FIXME: This one is wrong, we should consume only one pattern.
    check_prefix(PrefixEntryPoint::Pat, ".. ..", ".. ..");
}

#[test]
fn ty() {
    check_prefix(PrefixEntryPoint::Ty, "fn() foo", "fn()");
    check_prefix(PrefixEntryPoint::Ty, "Clone + Copy + fn", "Clone + Copy +");
    check_prefix(PrefixEntryPoint::Ty, "struct f", "struct");
}

#[test]
fn expr() {
    check_prefix(PrefixEntryPoint::Expr, "92 92", "92");
    check_prefix(PrefixEntryPoint::Expr, "+1", "+");
    check_prefix(PrefixEntryPoint::Expr, "-1", "-1");
    check_prefix(PrefixEntryPoint::Expr, "fn foo() {}", "fn");
    check_prefix(PrefixEntryPoint::Expr, "#[attr] ()", "#[attr] ()");
}

#[test]
fn path() {
    check_prefix(PrefixEntryPoint::Path, "foo::bar baz", "foo::bar");
    check_prefix(PrefixEntryPoint::Path, "foo::<> baz", "foo::<>");
    check_prefix(PrefixEntryPoint::Path, "foo<> baz", "foo<>");
    check_prefix(PrefixEntryPoint::Path, "Fn() -> i32?", "Fn() -> i32");
    // FIXME: This shouldn't be accepted as path actually.
    check_prefix(PrefixEntryPoint::Path, "<_>::foo", "<_>::foo");
}

#[test]
fn item() {
    // FIXME: This shouldn't consume the semicolon.
    check_prefix(PrefixEntryPoint::Item, "fn foo() {};", "fn foo() {};");
    check_prefix(PrefixEntryPoint::Item, "#[attr] pub struct S {} 92", "#[attr] pub struct S {}");
    check_prefix(PrefixEntryPoint::Item, "item!{}?", "item!{}");
    check_prefix(PrefixEntryPoint::Item, "????", "?");
}

#[test]
fn meta_item() {
    check_prefix(PrefixEntryPoint::MetaItem, "attr, ", "attr");
    check_prefix(
        PrefixEntryPoint::MetaItem,
        "attr(some token {stream});",
        "attr(some token {stream})",
    );
    check_prefix(PrefixEntryPoint::MetaItem, "path::attr = 2 * 2!", "path::attr = 2 * 2");
}

#[track_caller]
fn check_prefix(entry: PrefixEntryPoint, input: &str, prefix: &str) {
    let lexed = LexedStr::new(input);
    let input = lexed.to_input();

    let mut n_tokens = 0;
    for step in entry.parse(&input).iter() {
        match step {
            Step::Token { n_input_tokens, .. } => n_tokens += n_input_tokens as usize,
            Step::Enter { .. } | Step::Exit | Step::Error { .. } => (),
        }
    }

    let mut i = 0;
    loop {
        if n_tokens == 0 {
            break;
        }
        if !lexed.kind(i).is_trivia() {
            n_tokens -= 1;
        }
        i += 1;
    }
    let buf = &lexed.as_str()[..lexed.text_start(i)];
    assert_eq!(buf, prefix);
}

#[test]
fn source_file() {
    check_top(
        TopEntryPoint::SourceFile,
        "",
        expect![[r#"
        SOURCE_FILE
    "#]],
    );

    check_top(
        TopEntryPoint::SourceFile,
        "struct S;",
        expect![[r#"
        SOURCE_FILE
          STRUCT
            STRUCT_KW "struct"
            WHITESPACE " "
            NAME
              IDENT "S"
            SEMICOLON ";"
    "#]],
    );

    check_top(
        TopEntryPoint::SourceFile,
        "@error@",
        expect![[r#"
        SOURCE_FILE
          ERROR
            AT "@"
          MACRO_CALL
            PATH
              PATH_SEGMENT
                NAME_REF
                  IDENT "error"
          ERROR
            AT "@"
        error 0: expected an item
        error 6: expected BANG
        error 6: expected `{`, `[`, `(`
        error 6: expected SEMICOLON
        error 6: expected an item
    "#]],
    );
}

#[track_caller]
fn check_top(entry: TopEntryPoint, input: &str, expect: expect_test::Expect) {
    let (parsed, _errors) = super::parse(entry, input);
    expect.assert_eq(&parsed)
}