icu_capi 2.0.2

C interface to ICU4X
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
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

// This file is part of ICU4X. For terms of use, please see the file
// called LICENSE at the top level of the ICU4X source tree
// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).

#![allow(dead_code)] // features in here are a mess

use alloc::boxed::Box;
use icu_calendar::Gregorian;
use icu_datetime::{
    fieldsets::builder::BuilderError, fieldsets::enums::*, fieldsets::Combo, pattern::*,
    scaffold::*, DateTimeFormatter, DateTimeFormatterLoadError, FixedCalendarDateTimeFormatter,
};

pub(crate) fn map_or_default<Input, Output>(input: Option<Input>) -> Output
where
    Output: From<Input> + Default,
{
    input.map(Output::from).unwrap_or_default()
}

pub(super) fn date_formatter_with_zone<Zone>(
    formatter: &DateTimeFormatter<DateFieldSet>,
    locale: &crate::unstable::locale_core::ffi::Locale,
    zone: Zone,
    load: impl FnOnce(
        &mut DateTimeNames<Combo<DateFieldSet, Zone>>,
    ) -> Result<(), crate::unstable::errors::ffi::DateTimeFormatterLoadError>,
    to_formatter: impl FnOnce(
        DateTimeNames<Combo<DateFieldSet, Zone>>,
        Combo<DateFieldSet, Zone>,
    ) -> Result<
        DateTimeFormatter<Combo<DateFieldSet, Zone>>,
        (
            DateTimeFormatterLoadError,
            DateTimeNames<Combo<DateFieldSet, Zone>>,
        ),
    >,
) -> Result<
    Box<crate::unstable::zoned_date_formatter::ffi::ZonedDateFormatter>,
    crate::unstable::errors::ffi::DateTimeFormatterLoadError,
>
where
    Zone: DateTimeMarkers + ZoneMarkers,
    <Zone as DateTimeMarkers>::Z: ZoneMarkers,
    Combo<DateFieldSet, Zone>: DateTimeNamesFrom<DateFieldSet>,
    ZonedDateFieldSet: DateTimeNamesFrom<Combo<DateFieldSet, Zone>>,
{
    let prefs = (&locale.0).into();
    let mut names = DateTimeNames::from_formatter(prefs, formatter.clone())
        .cast_into_fset::<Combo<DateFieldSet, Zone>>();
    load(&mut names)?;
    let field_set = formatter
        .to_field_set_builder()
        .build_date()
        .map_err(|e| match e {
            BuilderError::InvalidDateFields => {
                // This can fail if the date fields are for a calendar period
                crate::unstable::errors::ffi::DateTimeFormatterLoadError::InvalidDateFields
            }
            _ => {
                debug_assert!(false, "should be infallible, but got: {e:?}");
                crate::unstable::errors::ffi::DateTimeFormatterLoadError::Unknown
            }
        })?
        .with_zone(zone);
    let formatter = to_formatter(names, field_set)
        // This can fail if the locale doesn't match and the fields conflict
        .map_err(|(e, _)| e)?
        .cast_into_fset();
    Ok(Box::new(
        crate::unstable::zoned_date_formatter::ffi::ZonedDateFormatter(formatter),
    ))
}

pub(super) fn datetime_formatter_with_zone<Zone>(
    formatter: &DateTimeFormatter<CompositeDateTimeFieldSet>,
    locale: &crate::unstable::locale_core::ffi::Locale,
    zone: Zone,
    load: impl FnOnce(
        &mut DateTimeNames<Combo<DateAndTimeFieldSet, Zone>>,
    ) -> Result<(), crate::unstable::errors::ffi::DateTimeFormatterLoadError>,
    to_formatter: impl FnOnce(
        DateTimeNames<Combo<DateAndTimeFieldSet, Zone>>,
        Combo<DateAndTimeFieldSet, Zone>,
    ) -> Result<
        DateTimeFormatter<Combo<DateAndTimeFieldSet, Zone>>,
        (
            DateTimeFormatterLoadError,
            DateTimeNames<Combo<DateAndTimeFieldSet, Zone>>,
        ),
    >,
) -> Result<
    Box<crate::unstable::zoned_date_time_formatter::ffi::ZonedDateTimeFormatter>,
    crate::unstable::errors::ffi::DateTimeFormatterLoadError,
>
where
    Zone: DateTimeMarkers + ZoneMarkers,
    <Zone as DateTimeMarkers>::Z: ZoneMarkers,
    Combo<DateAndTimeFieldSet, Zone>: DateTimeNamesFrom<CompositeDateTimeFieldSet>,
    ZonedDateAndTimeFieldSet: DateTimeNamesFrom<Combo<DateAndTimeFieldSet, Zone>>,
{
    let prefs = (&locale.0).into();
    let mut names = DateTimeNames::from_formatter(prefs, formatter.clone())
        .cast_into_fset::<Combo<DateAndTimeFieldSet, Zone>>();
    load(&mut names)?;
    let field_set = formatter
        .to_field_set_builder()
        .build_date_and_time()
        .map_err(|e| match e {
            BuilderError::InvalidDateFields => {
                debug_assert!(false, "fields were already validated in DateTimeFormatter");
                crate::unstable::errors::ffi::DateTimeFormatterLoadError::InvalidDateFields
            }
            _ => {
                debug_assert!(false, "should be infallible, but got: {e:?}");
                crate::unstable::errors::ffi::DateTimeFormatterLoadError::Unknown
            }
        })?
        .with_zone(zone);
    let formatter = to_formatter(names, field_set)
        // This can fail if the locale doesn't match and the fields conflict
        .map_err(|(e, _)| e)?
        .cast_into_fset();
    Ok(Box::new(
        crate::unstable::zoned_date_time_formatter::ffi::ZonedDateTimeFormatter(formatter),
    ))
}

pub(super) fn date_formatter_gregorian_with_zone<Zone>(
    formatter: &FixedCalendarDateTimeFormatter<Gregorian, DateFieldSet>,
    locale: &crate::unstable::locale_core::ffi::Locale,
    zone: Zone,
    load: impl FnOnce(
        &mut FixedCalendarDateTimeNames<Gregorian, Combo<DateFieldSet, Zone>>,
    ) -> Result<(), crate::unstable::errors::ffi::DateTimeFormatterLoadError>,
    to_formatter: impl FnOnce(
        FixedCalendarDateTimeNames<Gregorian, Combo<DateFieldSet, Zone>>,
        Combo<DateFieldSet, Zone>,
    ) -> Result<
        FixedCalendarDateTimeFormatter<Gregorian, Combo<DateFieldSet, Zone>>,
        (
            DateTimeFormatterLoadError,
            FixedCalendarDateTimeNames<Gregorian, Combo<DateFieldSet, Zone>>,
        ),
    >,
) -> Result<
    Box<crate::unstable::zoned_date_formatter::ffi::ZonedDateFormatterGregorian>,
    crate::unstable::errors::ffi::DateTimeFormatterLoadError,
>
where
    Zone: DateTimeMarkers + ZoneMarkers,
    <Zone as DateTimeMarkers>::Z: ZoneMarkers,
    Combo<DateFieldSet, Zone>: DateTimeNamesFrom<DateFieldSet>,
    ZonedDateFieldSet: DateTimeNamesFrom<Combo<DateFieldSet, Zone>>,
{
    let prefs = (&locale.0).into();
    let mut names = FixedCalendarDateTimeNames::from_formatter(prefs, formatter.clone())
        .cast_into_fset::<Combo<DateFieldSet, Zone>>();
    load(&mut names)?;
    let field_set = formatter
        .to_field_set_builder()
        .build_date()
        .map_err(|e| match e {
            BuilderError::InvalidDateFields => {
                // This can fail if the date fields are for a calendar period
                crate::unstable::errors::ffi::DateTimeFormatterLoadError::InvalidDateFields
            }
            _ => {
                debug_assert!(false, "should be infallible, but got: {e:?}");
                crate::unstable::errors::ffi::DateTimeFormatterLoadError::Unknown
            }
        })?
        .with_zone(zone);
    let formatter = to_formatter(names, field_set)
        // This can fail if the locale doesn't match and the fields conflict
        .map_err(|(e, _)| e)?
        .cast_into_fset();
    Ok(Box::new(
        crate::unstable::zoned_date_formatter::ffi::ZonedDateFormatterGregorian(formatter),
    ))
}

pub(super) fn datetime_formatter_gregorian_with_zone<Zone>(
    formatter: &FixedCalendarDateTimeFormatter<Gregorian, CompositeDateTimeFieldSet>,
    locale: &crate::unstable::locale_core::ffi::Locale,
    zone: Zone,
    load: impl FnOnce(
        &mut FixedCalendarDateTimeNames<Gregorian, Combo<DateAndTimeFieldSet, Zone>>,
    ) -> Result<(), crate::unstable::errors::ffi::DateTimeFormatterLoadError>,
    to_formatter: impl FnOnce(
        FixedCalendarDateTimeNames<Gregorian, Combo<DateAndTimeFieldSet, Zone>>,
        Combo<DateAndTimeFieldSet, Zone>,
    ) -> Result<
        FixedCalendarDateTimeFormatter<Gregorian, Combo<DateAndTimeFieldSet, Zone>>,
        (
            DateTimeFormatterLoadError,
            FixedCalendarDateTimeNames<Gregorian, Combo<DateAndTimeFieldSet, Zone>>,
        ),
    >,
) -> Result<
    Box<crate::unstable::zoned_date_time_formatter::ffi::ZonedDateTimeFormatterGregorian>,
    crate::unstable::errors::ffi::DateTimeFormatterLoadError,
>
where
    Zone: DateTimeMarkers + ZoneMarkers,
    <Zone as DateTimeMarkers>::Z: ZoneMarkers,
    Combo<DateAndTimeFieldSet, Zone>: DateTimeNamesFrom<CompositeDateTimeFieldSet>,
    ZonedDateAndTimeFieldSet: DateTimeNamesFrom<Combo<DateAndTimeFieldSet, Zone>>,
{
    let prefs = (&locale.0).into();
    let mut names = FixedCalendarDateTimeNames::from_formatter(prefs, formatter.clone())
        .cast_into_fset::<Combo<DateAndTimeFieldSet, Zone>>();
    load(&mut names)?;
    let field_set = formatter
        .to_field_set_builder()
        .build_date_and_time()
        .map_err(|e| match e {
            BuilderError::InvalidDateFields => {
                debug_assert!(false, "fields were already validated in DateTimeFormatter");
                crate::unstable::errors::ffi::DateTimeFormatterLoadError::InvalidDateFields
            }
            _ => {
                debug_assert!(false, "should be infallible, but got: {e:?}");
                crate::unstable::errors::ffi::DateTimeFormatterLoadError::Unknown
            }
        })?
        .with_zone(zone);
    let formatter = to_formatter(names, field_set)
        // This can fail if the locale doesn't match and the fields conflict
        .map_err(|(e, _)| e)?
        .cast_into_fset();
    Ok(Box::new(
        crate::unstable::zoned_date_time_formatter::ffi::ZonedDateTimeFormatterGregorian(formatter),
    ))
}