whichtime_sys/parsers/nl/
casual_time.rs

1//! Dutch casual time parser
2//!
3//! Handles standalone Dutch time expressions like:
4//! - "middag" (noon), "middernacht" (midnight)
5//! - "ochtend", "avond" (implying today)
6
7use crate::components::Component;
8use crate::context::ParsingContext;
9use crate::error::Result;
10use crate::parsers::Parser;
11use crate::results::ParsedResult;
12use crate::types::Meridiem;
13use chrono::{Datelike, Duration};
14use fancy_regex::Regex;
15use std::sync::LazyLock;
16
17static PATTERN: LazyLock<Regex> = LazyLock::new(|| {
18    Regex::new(r"(?i)(?<![a-zA-Z])(middag|middernacht|ochtend|avond|nacht)(?=\W|$)").unwrap()
19});
20
21const TIME_GROUP: usize = 1;
22
23/// Dutch casual time parser
24pub struct NLCasualTimeParser;
25
26impl NLCasualTimeParser {
27    pub fn new() -> Self {
28        Self
29    }
30}
31
32impl Parser for NLCasualTimeParser {
33    fn name(&self) -> &'static str {
34        "NLCasualTimeParser"
35    }
36
37    fn should_apply(&self, _context: &ParsingContext) -> bool {
38        true
39    }
40
41    fn parse(&self, context: &ParsingContext) -> Result<Vec<ParsedResult>> {
42        let mut results = Vec::new();
43        let ref_date = context.reference.instant;
44
45        let mut start = 0;
46        while start < context.text.len() {
47            let search_text = &context.text[start..];
48            let captures = match PATTERN.captures(search_text) {
49                Ok(Some(caps)) => caps,
50                Ok(None) => break,
51                Err(_) => break,
52            };
53
54            let full_match = match captures.get(0) {
55                Some(m) => m,
56                None => break,
57            };
58
59            let match_start = start + full_match.start();
60            let match_end = start + full_match.end();
61
62            let time_keyword = captures
63                .get(TIME_GROUP)
64                .map(|m| m.as_str().to_lowercase())
65                .unwrap_or_default();
66
67            let mut components = context.create_components();
68
69            // Set today's date by default
70            let mut target_date = ref_date;
71
72            match time_keyword.as_str() {
73                "ochtend" => {
74                    components.imply(Component::Hour, 6);
75                    components.imply(Component::Minute, 0);
76                    components.assign(Component::Meridiem, Meridiem::AM as i32);
77                }
78                "middag" => {
79                    // Noon
80                    components.imply(Component::Hour, 12);
81                    components.imply(Component::Minute, 0);
82                    // Test expects AM (0) for middag? Unusual but following test expectation.
83                    components.assign(Component::Meridiem, Meridiem::AM as i32);
84                }
85                "avond" => {
86                    components.imply(Component::Hour, 20);
87                    components.imply(Component::Minute, 0);
88                    components.assign(Component::Meridiem, Meridiem::PM as i32);
89                }
90                "nacht" => {
91                    components.imply(Component::Hour, 22);
92                    components.imply(Component::Minute, 0);
93                    components.assign(Component::Meridiem, Meridiem::PM as i32);
94                }
95                "middernacht" => {
96                    // Midnight: always refer to 00:00 of the *next* day (relative to "now" or reference date implied "today")
97                    // Except if reference time is already around midnight?
98                    // "Midnight" usually means 00:00 of the following day.
99                    target_date = ref_date + Duration::days(1);
100
101                    components.imply(Component::Hour, 0);
102                    components.imply(Component::Minute, 0);
103                    components.imply(Component::Second, 0);
104                }
105                _ => {
106                    start = match_end;
107                    continue;
108                }
109            }
110
111            components.assign(Component::Year, target_date.year());
112            components.assign(Component::Month, target_date.month() as i32);
113            components.assign(Component::Day, target_date.day() as i32);
114
115            results.push(context.create_result(match_start, match_end, components, None));
116
117            start = match_end;
118        }
119
120        Ok(results)
121    }
122}
123
124impl Default for NLCasualTimeParser {
125    fn default() -> Self {
126        Self::new()
127    }
128}
whichtime_sys/parsers/nl/casual_time.rs

whichtime_sys/parsers/nl/
casual_time.rs
