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
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
// Copyright (C) 2017 Sebastian Dröge <sebastian@centricular.com>
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use std::cmp;
use std::fmt;

use DateTime;

impl DateTime {
    pub fn to_utc(&self) -> Result<DateTime, glib::BoolError> {
        if !self.has_time() {
            // No time => no TZ offset
            return Ok(self.clone());
        }

        assert!(self.has_year() && self.has_month() && self.has_day() && self.has_time());

        // Can instantiate `gst::DateTime` without seconds using `gst::DateTime::new`
        // with `-1f64` for the `second` argument
        // however, the resulting instance can't be translated to `glib::DateTime`
        if self.has_second() {
            self.to_g_date_time()
                .expect("DateTime::to_utc: to_g_date_time")
                .to_utc()
                .as_ref()
                .ok_or_else(|| glib_bool_error!("Can't convert datetime to UTC"))
                .map(DateTime::new_from_g_date_time)
        } else {
            // It would be cheaper to build a `glib::DateTime` direcly, unfortunetaly
            // this would require using `glib::TimeZone::new_offset` which is feature-gated
            // to `glib/v2_58`. So we need to build a new `gst::DateTime` with `0f64`
            // and then discard seconds again
            DateTime::new(
                self.get_time_zone_offset(),
                self.get_year(),
                self.get_month(),
                self.get_day(),
                self.get_hour(),
                self.get_minute(),
                0f64,
            )
            .to_g_date_time()
            .expect("DateTime::to_utc: to_g_date_time")
            .to_utc()
            .ok_or_else(|| glib_bool_error!("Can't convert datetime to UTC"))
            .map(|g_date_time_utc| {
                DateTime::new(
                    0f32, // UTC TZ offset
                    g_date_time_utc.get_year(),
                    g_date_time_utc.get_month(),
                    g_date_time_utc.get_day_of_month(),
                    g_date_time_utc.get_hour(),
                    g_date_time_utc.get_minute(),
                    -1f64, // No second
                )
            })
        }
    }
}

impl cmp::PartialOrd for DateTime {
    fn partial_cmp(&self, other: &Self) -> Option<cmp::Ordering> {
        #[inline]
        fn get_cmp(delta: i32) -> Option<cmp::Ordering> {
            Some(delta.cmp(&0))
        }

        if !(self.has_year() && other.has_year()) {
            // Can't compare anything
            return None;
        }

        // Normalize to UTC only if both members have time (see note 2).
        let (self_norm, other_norm) = if self.has_time() && other.has_time() {
            (self.to_utc().ok()?, other.to_utc().ok()?)
        } else {
            (self.clone(), other.clone())
        };

        let year_delta = self_norm.get_year() - other_norm.get_year();
        if year_delta != 0 {
            return get_cmp(year_delta);
        }

        // Same year

        if !self.has_month() && !other.has_month() {
            // Nothing left to compare
            return get_cmp(year_delta);
        }

        if !(self.has_month() && other.has_month()) {
            // One has month, the other doesn't => can't compare (note 1)
            return None;
        }

        let month_delta = self_norm.get_month() - other_norm.get_month();
        if month_delta != 0 {
            return get_cmp(month_delta);
        }

        // Same year, same month

        if !self.has_day() && !other.has_day() {
            // Nothing left to compare
            return Some(cmp::Ordering::Equal);
        }

        if !(self.has_day() && other.has_day()) {
            // One has day, the other doesn't => can't compare (note 1)
            return None;
        }

        let day_delta = self_norm.get_day() - other_norm.get_day();
        if day_delta != 0 {
            return get_cmp(day_delta);
        }

        // Same year, same month, same day

        if !self.has_time() && !other.has_time() {
            // Nothing left to compare
            return Some(cmp::Ordering::Equal);
        }

        if !(self.has_time() && other.has_time()) {
            // One has time, the other doesn't => can't compare (note 1)
            return None;
        }

        let hour_delta = self_norm.get_hour() - other_norm.get_hour();
        if hour_delta != 0 {
            return get_cmp(hour_delta);
        }

        let minute_delta = self_norm.get_minute() - other_norm.get_minute();
        if minute_delta != 0 {
            return get_cmp(minute_delta);
        }

        // Same year, same month, same day, same time

        if !self.has_second() && !other.has_second() {
            // Nothing left to compare
            return Some(cmp::Ordering::Equal);
        }

        if !(self.has_second() && other.has_second()) {
            // One has second, the other doesn't => can't compare (note 1)
            return None;
        }
        let second_delta = self_norm.get_second() - other_norm.get_second();
        if second_delta != 0 {
            return get_cmp(second_delta);
        }

        get_cmp(self_norm.get_microsecond() - other_norm.get_microsecond())
    }
}

impl cmp::PartialEq for DateTime {
    fn eq(&self, other: &Self) -> bool {
        self.partial_cmp(other)
            .map_or_else(|| false, |cmp| cmp == cmp::Ordering::Equal)
    }
}

impl fmt::Debug for DateTime {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        let mut debug_struct = f.debug_struct("DateTime");
        if self.has_year() {
            debug_struct.field("year", &self.get_year());
        }
        if self.has_month() {
            debug_struct.field("month", &self.get_month());
        }
        if self.has_day() {
            debug_struct.field("day", &self.get_day());
        }
        if self.has_time() {
            debug_struct.field("hour", &self.get_hour());
            debug_struct.field("minute", &self.get_minute());

            if self.has_second() {
                debug_struct.field("second", &self.get_second());
                debug_struct.field("microsecond", &self.get_microsecond());
            }

            debug_struct.field("tz_offset", &self.get_time_zone_offset());
        }

        debug_struct.finish()
    }
}

impl fmt::Display for DateTime {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.write_str(
            self.to_iso8601_string()
                .unwrap_or_else(|_| "None".into())
                .as_str(),
        )
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[allow(clippy::cognitive_complexity)]
    #[test]
    fn test_to_utc() {
        ::init().unwrap();

        // Hour offset
        let utc_date_time = DateTime::new(2f32, 2019, 8, 20, 20, 9, 42.123_456f64)
            .to_utc()
            .unwrap();
        assert_eq!(utc_date_time.get_year(), 2019);
        assert_eq!(utc_date_time.get_month(), 8);
        assert_eq!(utc_date_time.get_day(), 20);
        assert_eq!(utc_date_time.get_hour(), 18);
        assert_eq!(utc_date_time.get_minute(), 9);
        assert_eq!(utc_date_time.get_second(), 42);
        assert_eq!(utc_date_time.get_microsecond(), 123_456);

        // Year, month, day and hour offset
        let utc_date_time = DateTime::new(2f32, 2019, 1, 1, 0, 0, 42.123_456f64)
            .to_utc()
            .unwrap();
        assert_eq!(utc_date_time.get_year(), 2018);
        assert_eq!(utc_date_time.get_month(), 12);
        assert_eq!(utc_date_time.get_day(), 31);
        assert_eq!(utc_date_time.get_hour(), 22);
        assert_eq!(utc_date_time.get_minute(), 0);
        assert_eq!(utc_date_time.get_second(), 42);
        assert_eq!(utc_date_time.get_microsecond(), 123_456);

        // Date without an hour (which implies no TZ)
        let utc_date_time = DateTime::new_ymd(2019, 1, 1).to_utc().unwrap();
        assert_eq!(utc_date_time.get_year(), 2019);
        assert_eq!(utc_date_time.get_month(), 1);
        assert_eq!(utc_date_time.get_day(), 1);
        assert!(!utc_date_time.has_time());
        assert!(!utc_date_time.has_second());

        // Date without seconds
        let utc_date_time = DateTime::new(2f32, 2018, 5, 28, 16, 6, -1f64)
            .to_utc()
            .unwrap();
        assert_eq!(utc_date_time.get_year(), 2018);
        assert_eq!(utc_date_time.get_month(), 5);
        assert_eq!(utc_date_time.get_day(), 28);
        assert_eq!(utc_date_time.get_hour(), 14);
        assert_eq!(utc_date_time.get_minute(), 6);
        assert!(!utc_date_time.has_second());
    }

    #[test]
    fn test_partial_ord() {
        ::init().unwrap();

        // Different years
        assert!(
            DateTime::new(2f32, 2020, 8, 20, 19, 43, 42.123_456f64)
                > DateTime::new(2f32, 2019, 8, 20, 19, 43, 42.123_456f64)
        );

        // Different months (order intentionally reversed)
        assert!(
            DateTime::new(2f32, 2019, 8, 20, 19, 43, 42.123_456f64)
                < DateTime::new(2f32, 2019, 9, 19, 19, 43, 42.123_456f64)
        );

        // Different days
        assert!(
            DateTime::new(2f32, 2019, 8, 21, 19, 43, 42.123_456f64)
                > DateTime::new(2f32, 2019, 8, 20, 19, 43, 42.123_456f64)
        );

        // Different hours
        assert!(
            DateTime::new(2f32, 2019, 8, 20, 19, 44, 42.123_456f64)
                > DateTime::new(2f32, 2019, 8, 20, 19, 43, 42.123_456f64)
        );

        // Different minutes
        assert!(
            DateTime::new(2f32, 2019, 8, 20, 19, 43, 44.123_456f64)
                > DateTime::new(2f32, 2019, 8, 20, 19, 43, 42.123_456f64)
        );

        // Different seconds
        assert!(
            DateTime::new(2f32, 2019, 8, 20, 19, 43, 43.123_456f64)
                > DateTime::new(2f32, 2019, 8, 20, 19, 43, 42.123_456f64)
        );

        // Different micro-seconds
        assert!(
            DateTime::new(2f32, 2019, 8, 20, 19, 43, 42.123_457f64)
                > DateTime::new(2f32, 2019, 8, 20, 19, 43, 42.123_456f64)
        );

        // Different TZ offsets
        assert!(
            DateTime::new(1f32, 2019, 8, 20, 19, 43, 42.123_456f64)
                > DateTime::new(2f32, 2019, 8, 20, 19, 43, 42.123_456f64)
        );

        // TZ offset leading to year, month, day, hour offset
        assert!(
            DateTime::new(2f32, 2019, 1, 1, 0, 0, 0f64)
                < DateTime::new(1f32, 2018, 12, 31, 23, 59, 0f64)
        );

        // Partially defined `DateTime`
        assert!(DateTime::new_ymd(2020, 8, 20) > DateTime::new_ymd(2019, 8, 20));
        assert!(DateTime::new_ymd(2019, 9, 20) > DateTime::new_ymd(2019, 8, 20));
        assert!(DateTime::new_ymd(2019, 8, 21) > DateTime::new_ymd(2019, 8, 20));

        assert!(DateTime::new_ym(2020, 8) > DateTime::new_ym(2019, 8));
        assert!(DateTime::new_ym(2019, 9) > DateTime::new_ym(2019, 8));
        assert!(DateTime::new_ym(2019, 9) > DateTime::new_ymd(2019, 8, 20));

        assert!(DateTime::new_y(2020) > DateTime::new_y(2019));
        assert!(DateTime::new_ym(2020, 1) > DateTime::new_y(2019));

        assert!(
            DateTime::new(2f32, 2019, 8, 20, 19, 43, 44.123_456f64)
                < DateTime::new_ymd(2020, 8, 20)
        );

        assert!(
            DateTime::new_ymd(2020, 8, 20)
                > DateTime::new(2f32, 2019, 8, 20, 19, 43, 44.123_456f64)
        );

        // Comparison occurs on the same TZ when the `DateTime` doesn't have time (note 2)
        assert!(DateTime::new_ymd(2020, 1, 1) > DateTime::new(-2f32, 2019, 12, 31, 23, 59, 0f64));

        // In the following cases, the partially defined `DateTime` is a range WRT
        // the fully defined `DateTime` and this range includes the fully defined `DateTime`,
        // but we can't tell if it's before or after and they are not equal (note 1)
        assert!(DateTime::new(2f32, 2019, 8, 20, 19, 43, 44.123_456f64)
            .partial_cmp(&DateTime::new_ymd(2019, 8, 20))
            .is_none());

        assert!(DateTime::new_ymd(2019, 8, 20)
            .partial_cmp(&DateTime::new(2f32, 2019, 8, 20, 19, 43, 44.123_456f64))
            .is_none());

        assert!(DateTime::new_ym(2019, 1)
            .partial_cmp(&DateTime::new_y(2019))
            .is_none());
    }

    #[test]
    fn test_eq() {
        ::init().unwrap();

        assert_eq!(
            DateTime::new(2f32, 2018, 5, 28, 16, 6, 42.123_456f64),
            DateTime::new(2f32, 2018, 5, 28, 16, 6, 42.123_456f64)
        );

        assert_eq!(
            DateTime::new(2f32, 2018, 5, 28, 16, 6, 0f64),
            DateTime::new(2f32, 2018, 5, 28, 16, 6, 0f64)
        );

        assert_eq!(
            DateTime::new(2f32, 2018, 5, 28, 16, 6, -1f64),
            DateTime::new(2f32, 2018, 5, 28, 16, 6, -1f64)
        );

        assert_eq!(
            DateTime::new_ymd(2018, 5, 28),
            DateTime::new_ymd(2018, 5, 28)
        );

        // In the following cases, the partially defined `DateTime` is a range WRT
        // the fully defined `DateTime` and this range includes the fully defined `DateTime`,
        // but they are not equal (note 1)
        assert_ne!(
            DateTime::new_ymd(2018, 5, 28),
            DateTime::new(2f32, 2018, 5, 28, 16, 6, -1f64)
        );

        assert_ne!(
            DateTime::new(2f32, 2018, 5, 28, 16, 6, -1f64),
            DateTime::new_ym(2018, 5)
        );

        assert_ne!(
            DateTime::new(2f32, 2018, 5, 28, 16, 6, -1f64),
            DateTime::new_y(2018)
        );
    }
}