whichtime_sys/parsers/uk/
weekday.rs

1//! Ukrainian weekday parser
2//!
3//! Handles Ukrainian weekday expressions like:
4//! - "понеділок", "вівторок", etc.
5//! - "у п'ятницю", "в середу" (with preposition)
6//! - "в минулий четвер", "в наступний вівторок" (with modifier)
7//! - "в середу вранці" (with time)
8
9use crate::components::Component;
10use crate::context::ParsingContext;
11use crate::dictionaries::uk::get_weekday;
12use crate::error::Result;
13use crate::parsers::Parser;
14use crate::results::ParsedResult;
15use crate::types::Meridiem;
16use chrono::{Datelike, Duration, Weekday as ChronoWeekday};
17use fancy_regex::Regex;
18use std::sync::LazyLock;
19
20static PATTERN: LazyLock<Regex> = LazyLock::new(|| {
21    Regex::new(
22        r"(?i)(?<![а-яА-ЯіїєґІЇЄҐ'])(?:(?P<prep>[уву])\s+)?(?:(?P<modifier>минулий|минулу|минула|наступний|наступну|наступна|цей|цю|ця)\s+)?(?P<weekday>понеділок|понеділка|вівторок|вівторка|середа|середу|середи|четвер|четверга|п'ятниця|п'ятницю|п'ятниці|пятниця|пятницю|субота|суботу|суботи|неділя|неділю|неділі|пн|вт|ср|чт|пт|сб|нд)(?:\s+(?P<time>вранці|зранку|опівдні|вдень|ввечері|увечері|вночі))?(?![а-яА-ЯіїєґІЇЄҐ'])"
23    ).unwrap()
24});
25
26/// Ukrainian weekday parser
27pub struct UKWeekdayParser;
28
29impl UKWeekdayParser {
30    pub fn new() -> Self {
31        Self
32    }
33
34    fn assign_time_part(components: &mut crate::components::FastComponents, time_part: &str) {
35        match time_part.to_lowercase().as_str() {
36            "вранці" | "зранку" => {
37                components.assign(Component::Hour, 6);
38                components.assign(Component::Minute, 0);
39                components.assign(Component::Meridiem, Meridiem::AM as i32);
40            }
41            "опівдні" => {
42                components.assign(Component::Hour, 12);
43                components.assign(Component::Minute, 0);
44                components.assign(Component::Meridiem, Meridiem::PM as i32);
45            }
46            "вдень" => {
47                components.assign(Component::Hour, 14);
48                components.assign(Component::Minute, 0);
49                components.assign(Component::Meridiem, Meridiem::PM as i32);
50            }
51            "ввечері" | "увечері" => {
52                components.assign(Component::Hour, 20);
53                components.assign(Component::Minute, 0);
54                components.assign(Component::Meridiem, Meridiem::PM as i32);
55            }
56            "вночі" => {
57                components.assign(Component::Hour, 2);
58                components.assign(Component::Minute, 0);
59                components.assign(Component::Meridiem, Meridiem::AM as i32);
60            }
61            _ => {}
62        }
63    }
64}
65
66impl Default for UKWeekdayParser {
67    fn default() -> Self {
68        Self::new()
69    }
70}
71
72impl Parser for UKWeekdayParser {
73    fn name(&self) -> &'static str {
74        "UKWeekdayParser"
75    }
76
77    fn should_apply(&self, _context: &ParsingContext) -> bool {
78        true
79    }
80
81    fn parse(&self, context: &ParsingContext) -> Result<Vec<ParsedResult>> {
82        let mut results = Vec::new();
83        let ref_date = context.reference.instant;
84
85        let mut start = 0;
86        while start < context.text.len() {
87            let search_text = &context.text[start..];
88            let captures = match PATTERN.captures(search_text) {
89                Ok(Some(caps)) => caps,
90                Ok(None) => break,
91                Err(_) => break,
92            };
93
94            let full_match = match captures.get(0) {
95                Some(m) => m,
96                None => break,
97            };
98
99            let match_start = start + full_match.start();
100            let match_end = start + full_match.end();
101
102            let modifier = captures.name("modifier").map(|m| m.as_str().to_lowercase());
103            let weekday_str = captures
104                .name("weekday")
105                .map(|m| m.as_str().to_lowercase())
106                .unwrap_or_default();
107            let time_part = captures.name("time").map(|m| m.as_str());
108
109            // Clean weekday string (remove trailing dots)
110            let clean_weekday = weekday_str.trim_end_matches('.');
111
112            let Some(weekday) = get_weekday(clean_weekday) else {
113                start = match_end;
114                continue;
115            };
116
117            let mut components = context.create_components();
118
119            // Convert our weekday to chrono weekday for calculation
120            let target_weekday = match weekday {
121                crate::types::Weekday::Sunday => ChronoWeekday::Sun,
122                crate::types::Weekday::Monday => ChronoWeekday::Mon,
123                crate::types::Weekday::Tuesday => ChronoWeekday::Tue,
124                crate::types::Weekday::Wednesday => ChronoWeekday::Wed,
125                crate::types::Weekday::Thursday => ChronoWeekday::Thu,
126                crate::types::Weekday::Friday => ChronoWeekday::Fri,
127                crate::types::Weekday::Saturday => ChronoWeekday::Sat,
128            };
129
130            let current_weekday = ref_date.weekday();
131            let current_day_num = current_weekday.num_days_from_sunday() as i64;
132            let target_day_num = target_weekday.num_days_from_sunday() as i64;
133
134            // Calculate days difference
135            let mut days_diff = target_day_num - current_day_num;
136
137            // Check if preposition is present
138            let has_preposition = captures.name("prep").is_some();
139
140            // Handle modifiers
141            let target_date = match modifier.as_deref() {
142                Some(m) if m.starts_with("наступн") => {
143                    // Next occurrence (always in the future, at least 1 day ahead)
144                    if days_diff <= 0 {
145                        days_diff += 7;
146                    }
147                    ref_date + Duration::days(days_diff)
148                }
149                Some(m) if m.starts_with("минул") => {
150                    // Last occurrence (always in the past)
151                    if days_diff >= 0 {
152                        days_diff -= 7;
153                    }
154                    ref_date + Duration::days(days_diff)
155                }
156                _ if has_preposition => {
157                    // With preposition (у/в середу) - find nearest occurrence (closest)
158                    // Compare absolute distance to past vs future occurrence
159                    let past_diff = if days_diff > 0 {
160                        days_diff - 7
161                    } else {
162                        days_diff
163                    };
164                    let future_diff = if days_diff <= 0 {
165                        days_diff + 7
166                    } else {
167                        days_diff
168                    };
169
170                    // Use whichever is closer (prefer future for equal distance)
171                    if past_diff.abs() < future_diff.abs() {
172                        days_diff = past_diff;
173                    } else {
174                        days_diff = future_diff;
175                    }
176                    ref_date + Duration::days(days_diff)
177                }
178                _ => {
179                    // Without preposition - find nearest past/current occurrence
180                    if days_diff > 0 {
181                        days_diff -= 7;
182                    }
183                    ref_date + Duration::days(days_diff)
184                }
185            };
186
187            components.assign(Component::Year, target_date.year());
188            components.assign(Component::Month, target_date.month() as i32);
189            components.assign(Component::Day, target_date.day() as i32);
190            components.assign(Component::Weekday, weekday as i32);
191
192            // Apply time part if present
193            if let Some(tp) = time_part {
194                Self::assign_time_part(&mut components, tp);
195            }
196
197            results.push(context.create_result(match_start, match_end, components, None));
198            start = match_end;
199        }
200
201        Ok(results)
202    }
203}
whichtime_sys/parsers/uk/weekday.rs

whichtime_sys/parsers/uk/
weekday.rs
