chrono-node-rs 0.1.0

Behaviour-matched Rust port of chrono-node: natural-language date parsing, checked against chrono-node's own output
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
138
139
140
141
142
143
144
145
146

//! upstream `locales/pt/constants.ts`. Ported in full so parser tasks don't edit this file.
//!
//! Dictionaries are `(key, value)` slices **in upstream's key order**. It matters:
//! `match_any_pattern` sorts stably, so equal-length keys keep this order.

use crate::core::utils::js::js_parse_int;
use crate::core::utils::pattern::Dictionary;
use crate::js_regex;

pub static WEEKDAY_DICTIONARY: &Dictionary<i64> = &[
    ("domingo", 0),
    ("dom", 0),
    ("segunda", 1),
    ("segunda-feira", 1),
    ("seg", 1),
    ("terça", 2),
    ("terça-feira", 2),
    ("ter", 2),
    ("quarta", 3),
    ("quarta-feira", 3),
    ("qua", 3),
    ("quinta", 4),
    ("quinta-feira", 4),
    ("qui", 4),
    ("sexta", 5),
    ("sexta-feira", 5),
    ("sex", 5),
    ("sábado", 6),
    ("sabado", 6),
    ("sab", 6),
];

pub static MONTH_DICTIONARY: &Dictionary<i64> = &[
    ("janeiro", 1),
    ("jan", 1),
    ("jan.", 1),
    ("fevereiro", 2),
    ("fev", 2),
    ("fev.", 2),
    ("março", 3),
    ("mar", 3),
    ("mar.", 3),
    ("abril", 4),
    ("abr", 4),
    ("abr.", 4),
    ("maio", 5),
    ("mai", 5),
    ("mai.", 5),
    ("junho", 6),
    ("jun", 6),
    ("jun.", 6),
    ("julho", 7),
    ("jul", 7),
    ("jul.", 7),
    ("agosto", 8),
    ("ago", 8),
    ("ago.", 8),
    ("setembro", 9),
    ("set", 9),
    ("set.", 9),
    ("outubro", 10),
    ("out", 10),
    ("out.", 10),
    ("novembro", 11),
    ("nov", 11),
    ("nov.", 11),
    ("dezembro", 12),
    ("dez", 12),
    ("dez.", 12),
];

//-----------------------------
// 88 p. Chr. n.
// 234 AC
pub const YEAR_PATTERN: &str = r"[0-9]{1,4}(?![^\s]\d)(?:\s*[a|d]\.?\s*c\.?|\s*a\.?\s*d\.?)?";

/// `parseYear(match)`. `None` is `NaN`.
pub fn parse_year(m: &str) -> Option<i64> {
    if js_regex!(r"^[0-9]{1,4}$").is_match(m) {
        // `NaN < 100` is false, so NaN would pass through unchanged (it can't happen here).
        let mut year_number = js_parse_int(m)?;
        if year_number < 100 {
            if year_number > 50 {
                year_number += 1900;
            } else {
                year_number += 2000;
            }
        }
        return Some(year_number);
    }

    let bc = js_regex!(r"a\.?\s*c\.?", "i");
    if let Some(found) = bc.exec(m) {
        // `match.replace(/a\.?\s*c\.?/i, "")`: the first match only.
        let rest = format!("{}{}", &m[..found.index], &m[found.index + found.text().len()..]);
        return js_parse_int(&rest).map(|y| -y);
    }

    js_parse_int(m)
}

#[cfg(test)]
mod tests {
    //! Expected values were produced by chrono-node v2.10.3 itself (compiled from `upstream/`).
    use super::*;
    use crate::core::regex::JsRegex;

    #[test]
    fn years() {
        for (s, v) in [
            ("2012", Some(2012)),
            ("12", Some(2012)),
            ("51", Some(1951)),
            ("50", Some(2050)),
            ("99", Some(1999)),
            ("100", Some(100)),
            ("0012", Some(2012)),
            ("234 AC", Some(-234)),
            ("234 a.c.", Some(-234)),
            ("234 A. C.", Some(-234)),
            ("88 ad", Some(88)),
            ("88 d.c.", Some(88)),
            ("5 dc", Some(5)),
            (" 12", Some(12)),
            ("abc", None),
        ] {
            assert_eq!(parse_year(s), v, "{s:?}");
        }
    }

    #[test]
    fn year_pattern() {
        let re = JsRegex::new(YEAR_PATTERN, "i");
        for (s, v) in [
            ("2012", "2012"),
            ("234 AC", "234 AC"),
            ("88 d.c.", "88 d.c."),
            ("1999x", "1999"),
            ("12 a.d.", "12 a.d."),
            // `[a|d]` is a character class that includes `|`.
            ("12 |c", "12 |c"),
        ] {
            assert_eq!(re.exec(s).map(|m| m.text().to_string()).as_deref(), Some(v), "{s:?}");
        }
    }
}