jayce 12.1.0

jayce is a tokenizer 🌌
Documentation 
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

use jayce::{Duo, Token, Tokenizer};
use std::sync::OnceLock;

const SOURCE: &str = r#"let kind_cat = "I calmly pet my cute cats"
pancake_icecream

very_multiline

"#;

fn duos() -> &'static Vec<Duo<&'static str>> {
    static DUOS: OnceLock<Vec<Duo<&'static str>>> = OnceLock::new();
    DUOS.get_or_init(|| {
        vec![
            Duo::new("whitespace", r"^[^\S\n]+", true),
            Duo::new("comment_line", r"^//(.*)", true),
            Duo::new("comment_block", r"^/\*(.|\n)*?\*/", true),
            Duo::new("newline", r"^\n", true),
            Duo::new("operator", r"^=", true),
            Duo::new("keyword", r"^let", true),
            Duo::new("string", r#"^"[^"]*""#, true),
            Duo::new("identifier", r"^[a-z_]+", true),
        ]
    })
}

const EXPECTED: [Token<&'static str>; 14] = [
    Token {
        kind: &"keyword",
        value: "let",
        pos: (1, 1),
    },
    Token {
        kind: &"whitespace",
        value: " ",
        pos: (1, 4),
    },
    Token {
        kind: &"identifier",
        value: "kind_cat",
        pos: (1, 5),
    },
    Token {
        kind: &"whitespace",
        value: " ",
        pos: (1, 13),
    },
    Token {
        kind: &"operator",
        value: "=",
        pos: (1, 14),
    },
    Token {
        kind: &"whitespace",
        value: " ",
        pos: (1, 15),
    },
    Token {
        kind: &"string",
        value: "\"I calmly pet my cute cats\"",
        pos: (1, 16),
    },
    Token {
        kind: &"newline",
        value: "\n",
        pos: (1, 43),
    },
    Token {
        kind: &"identifier",
        value: "pancake_icecream",
        pos: (2, 1),
    },
    Token {
        kind: &"newline",
        value: "\n",
        pos: (2, 17),
    },
    Token {
        kind: &"newline",
        value: "\n",
        pos: (3, 1),
    },
    Token {
        kind: &"identifier",
        value: "very_multiline",
        pos: (4, 1),
    },
    Token {
        kind: &"newline",
        value: "\n",
        pos: (4, 15),
    },
    Token {
        kind: &"newline",
        value: "\n",
        pos: (5, 1),
    },
];

#[test]
fn peek_test() {
    let mut tokenizer = Tokenizer::new(SOURCE, duos());
    let mut tokens = Vec::new();

    if let Some(token) = tokenizer.peek().unwrap() {
        assert_eq!(token, EXPECTED[0]);
    }
    if let Some(token) = tokenizer.peek().unwrap() {
        assert_eq!(token, EXPECTED[0]);
    }

    for expected in EXPECTED.iter() {
        let peeked = tokenizer.peek().unwrap();
        let consumed = tokenizer.consume().unwrap();
        assert_eq!(peeked, consumed);
        tokens.push(consumed.unwrap());
        if consumed.is_some() {
            assert_eq!(consumed.unwrap(), *expected);
        } else {
            panic!("Early termination, expected token.")
        }
    }

    let token = tokenizer.consume().unwrap();
    assert_eq!(token, None);
    let token = tokenizer.peek().unwrap();
    assert_eq!(token, None);
    let token = tokenizer.consume().unwrap();
    assert_eq!(token, None);
    let token = tokenizer.peek().unwrap();
    assert_eq!(token, None);
    let token = tokenizer.consume().unwrap();
    assert_eq!(token, None);

    assert_eq!(tokens, EXPECTED);
    assert_eq!(tokens.len(), EXPECTED.len());
}