datafusion_comet_spark_expr/
timezone.rs

1// Licensed to the Apache Software Foundation (ASF) under one
2// or more contributor license agreements.  See the NOTICE file
3// distributed with this work for additional information
4// regarding copyright ownership.  The ASF licenses this file
5// to you under the Apache License, Version 2.0 (the
6// "License"); you may not use this file except in compliance
7// with the License.  You may obtain a copy of the License at
8//
9//   http://www.apache.org/licenses/LICENSE-2.0
10//
11// Unless required by applicable law or agreed to in writing,
12// software distributed under the License is distributed on an
13// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14// KIND, either express or implied.  See the License for the
15// specific language governing permissions and limitations
16// under the License.
17
18/// Utils for timezone. This is basically from arrow-array::timezone (private).
19use arrow::error::ArrowError;
20use chrono::{
21    format::{parse, Parsed, StrftimeItems},
22    offset::TimeZone,
23    FixedOffset, LocalResult, NaiveDate, NaiveDateTime, Offset,
24};
25use std::str::FromStr;
26
27/// Parses a fixed offset of the form "+09:00"
28fn parse_fixed_offset(tz: &str) -> Result<FixedOffset, ArrowError> {
29    let mut parsed = Parsed::new();
30
31    if let Ok(fixed_offset) =
32        parse(&mut parsed, tz, StrftimeItems::new("%:z")).and_then(|_| parsed.to_fixed_offset())
33    {
34        return Ok(fixed_offset);
35    }
36
37    if let Ok(fixed_offset) =
38        parse(&mut parsed, tz, StrftimeItems::new("%#z")).and_then(|_| parsed.to_fixed_offset())
39    {
40        return Ok(fixed_offset);
41    }
42
43    Err(ArrowError::ParseError(format!(
44        "Invalid timezone \"{tz}\": Expected format [+-]XX:XX, [+-]XX, or [+-]XXXX"
45    )))
46}
47
48/// An [`Offset`] for [`Tz`]
49#[derive(Debug, Copy, Clone)]
50pub struct TzOffset {
51    tz: Tz,
52    offset: FixedOffset,
53}
54
55impl std::fmt::Display for TzOffset {
56    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
57        self.offset.fmt(f)
58    }
59}
60
61impl Offset for TzOffset {
62    fn fix(&self) -> FixedOffset {
63        self.offset
64    }
65}
66
67/// An Arrow [`TimeZone`]
68#[derive(Debug, Copy, Clone)]
69pub struct Tz(TzInner);
70
71#[derive(Debug, Copy, Clone)]
72enum TzInner {
73    Timezone(chrono_tz::Tz),
74    Offset(FixedOffset),
75}
76
77impl FromStr for Tz {
78    type Err = ArrowError;
79
80    fn from_str(tz: &str) -> Result<Self, Self::Err> {
81        if tz.starts_with('+') || tz.starts_with('-') {
82            Ok(Self(TzInner::Offset(parse_fixed_offset(tz)?)))
83        } else {
84            Ok(Self(TzInner::Timezone(tz.parse().map_err(|e| {
85                ArrowError::ParseError(format!("Invalid timezone \"{tz}\": {e}"))
86            })?)))
87        }
88    }
89}
90
91macro_rules! tz {
92    ($s:ident, $tz:ident, $b:block) => {
93        match $s.0 {
94            TzInner::Timezone($tz) => $b,
95            TzInner::Offset($tz) => $b,
96        }
97    };
98}
99
100impl TimeZone for Tz {
101    type Offset = TzOffset;
102
103    fn from_offset(offset: &Self::Offset) -> Self {
104        offset.tz
105    }
106
107    fn offset_from_local_date(&self, local: &NaiveDate) -> LocalResult<Self::Offset> {
108        tz!(self, tz, {
109            tz.offset_from_local_date(local).map(|x| TzOffset {
110                tz: *self,
111                offset: x.fix(),
112            })
113        })
114    }
115
116    fn offset_from_local_datetime(&self, local: &NaiveDateTime) -> LocalResult<Self::Offset> {
117        tz!(self, tz, {
118            tz.offset_from_local_datetime(local).map(|x| TzOffset {
119                tz: *self,
120                offset: x.fix(),
121            })
122        })
123    }
124
125    fn offset_from_utc_date(&self, utc: &NaiveDate) -> Self::Offset {
126        tz!(self, tz, {
127            TzOffset {
128                tz: *self,
129                offset: tz.offset_from_utc_date(utc).fix(),
130            }
131        })
132    }
133
134    fn offset_from_utc_datetime(&self, utc: &NaiveDateTime) -> Self::Offset {
135        tz!(self, tz, {
136            TzOffset {
137                tz: *self,
138                offset: tz.offset_from_utc_datetime(utc).fix(),
139            }
140        })
141    }
142}
datafusion_comet_spark_expr/timezone.rs

datafusion_comet_spark_expr/
timezone.rs
