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v/vlib/time/parse.v
2020-06-10 11:14:55 +02:00

120 lines
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V

// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module time
// parse returns time from a date string in "YYYY-MM-DD HH:MM:SS" format.
pub fn parse(s string) ?Time {
pos := s.index(' ') or {
return error('Invalid time format: $s')
}
symd := s[..pos]
ymd := symd.split('-')
if ymd.len != 3 {
return error('Invalid time format: $s')
}
shms := s[pos..]
hms := shms.split(':')
hour := hms[0][1..]
minute := hms[1]
second := hms[2]
res := new_time(Time{
year: ymd[0].int()
month: ymd[1].int()
day: ymd[2].int()
hour: hour.int()
minute: minute.int()
second: second.int()
})
return res
}
// parse_rfc2822 returns time from a date string in RFC 2822 datetime format.
pub fn parse_rfc2822(s string) ?Time {
fields := s.split(' ')
if fields.len < 5 {
return error('Invalid time format: $s')
}
pos := months_string.index(fields[2]) or {
return error('Invalid time format: $s')
}
mm := pos / 3 + 1
mut tmstr := byteptr(0)
unsafe { tmstr = malloc(s.len * 2) }
count := C.snprintf(charptr(tmstr), (s.len * 2), '%s-%02d-%s %s', fields[3].str, mm,
fields[1].str, fields[4].str)
return parse(tos(tmstr, count))
}
// parse_iso8601 parses rfc8601 time format yyyy-MM-ddTHH:mm:ss.dddddd+dd:dd as local time
// the fraction part is difference in milli seconds and the last part is offset
// from UTC time and can be both +/- HH:mm
// remarks: not all iso8601 is supported only the 'yyyy-MM-ddTHH:mm:ss.dddddd+dd:dd'
// also checks and support for leapseconds should be added in future PR
pub fn parse_iso8601(s string) ?Time {
mut year := 0
mut month := 0
mut day := 0
mut hour := 0
mut minute := 0
mut second := 0
mut mic_second := 0
mut time_char := `a`
mut plus_min := `a`
mut offset_hour := 0
mut offset_min := 0
count := C.sscanf(s.str, "%4d-%2d-%2d%c%2d:%2d:%2d.%6d%c%2d:%2d", &year, &month, &day,
&time_char, &hour, &minute,
&second, &mic_second, &plus_min,
&offset_hour, &offset_min)
if count != 11 {
return error('Invalid 8601 format')
}
if time_char != `T` && time_char != ` ` {
return error('Invalid 8601 format, expected space or `T` as time separator')
}
if plus_min != `+` && plus_min != `-` {
return error('Invalid 8601 format, expected `+` or `-` as time separator' )
}
mut t := new_time(Time{
year: year
month: month
day: day
hour: hour
minute: minute
second: second
microsecond: mic_second
})
mut unix_time := t.unix
mut unix_offset := int(0)
if offset_hour > 0 {
unix_offset += 3600*offset_hour
}
if offset_min > 0 {
unix_offset += 60*offset_min
}
if unix_offset != 0 {
if plus_min == `+` {
unix_time -= u64(unix_offset)
} else {
unix_time += u64(unix_offset)
}
t = unix2(int(unix_time), t.microsecond)
}
// Convert the time to local time
return to_local_time(t)
}