120 lines
3.4 KiB
V
120 lines
3.4 KiB
V
// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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module time
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// parse returns time from a date string in "YYYY-MM-DD HH:MM:SS" format.
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pub fn parse(s string) ?Time {
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pos := s.index(' ') or {
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return error('Invalid time format: $s')
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}
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symd := s[..pos]
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ymd := symd.split('-')
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if ymd.len != 3 {
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return error('Invalid time format: $s')
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}
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shms := s[pos..]
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hms := shms.split(':')
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hour := hms[0][1..]
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minute := hms[1]
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second := hms[2]
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res := new_time(Time{
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year: ymd[0].int()
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month: ymd[1].int()
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day: ymd[2].int()
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hour: hour.int()
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minute: minute.int()
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second: second.int()
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})
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return res
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}
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// parse_rfc2822 returns time from a date string in RFC 2822 datetime format.
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pub fn parse_rfc2822(s string) ?Time {
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fields := s.split(' ')
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if fields.len < 5 {
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return error('Invalid time format: $s')
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}
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pos := months_string.index(fields[2]) or {
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return error('Invalid time format: $s')
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}
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mm := pos / 3 + 1
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mut tmstr := byteptr(0)
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unsafe {
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tmstr = malloc(s.len * 2)
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}
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count := unsafe {C.snprintf(charptr(tmstr), (s.len * 2), '%s-%02d-%s %s', fields[3].str,
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mm, fields[1].str, fields[4].str)}
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return parse(tos(tmstr, count))
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}
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// parse_iso8601 parses rfc8601 time format yyyy-MM-ddTHH:mm:ss.dddddd+dd:dd as local time
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// the fraction part is difference in milli seconds and the last part is offset
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// from UTC time and can be both +/- HH:mm
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// remarks: not all iso8601 is supported
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// also checks and support for leapseconds should be added in future PR
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pub fn parse_iso8601(s string) ?Time {
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year := 0
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month := 0
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day := 0
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hour := 0
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minute := 0
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second := 0
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mic_second := 0
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time_char := `a`
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plus_min_z := `a`
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offset_hour := 0
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offset_min := 0
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mut count := unsafe {C.sscanf(charptr(s.str), '%4d-%2d-%2d%c%2d:%2d:%2d.%6d%c%2d:%2d',
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&year, &month, &day, charptr(&time_char), &hour, &minute, &second, &mic_second, charptr(&plus_min_z),
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&offset_hour, &offset_min)}
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// Missread microsec ([Year Month Day T Sec Hour Minute].len == 7 < 8)
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if count < 8 {
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count = unsafe {C.sscanf(charptr(s.str), '%4d-%2d-%2d%c%2d:%2d:%2d%c%2d:%2d',
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&year, &month, &day, charptr(&time_char), &hour, &minute, &second, charptr(&plus_min_z),
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&offset_hour, &offset_min)}
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count++ // Increment count because skipped microsec
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}
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is_local_time := plus_min_z == `a` && count == 8
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is_utc := plus_min_z == `Z` && count == 9
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if count != 11 && !is_local_time && !is_utc {
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return error('Invalid 8601 format')
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}
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if time_char != `T` && time_char != ` ` {
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return error('Invalid 8601 format, expected space or `T` as time separator')
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}
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if plus_min_z != `+` && plus_min_z != `-` && plus_min_z != `Z` && !is_local_time {
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return error('Invalid 8601 format, expected `Z` or `+` or `-` as time separator')
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}
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mut t := new_time(Time{
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year: year
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month: month
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day: day
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hour: hour
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minute: minute
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second: second
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microsecond: mic_second
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})
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if is_local_time {
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return to_local_time(t)
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}
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mut unix_time := t.unix
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mut unix_offset := int(0)
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if offset_hour > 0 {
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unix_offset += 3600 * offset_hour
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}
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if offset_min > 0 {
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unix_offset += 60 * offset_min
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}
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if unix_offset != 0 {
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if plus_min_z == `+` {
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unix_time -= u64(unix_offset)
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} else {
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unix_time += u64(unix_offset)
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}
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t = unix2(int(unix_time), t.microsecond)
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}
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// Convert the time to local time
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return to_local_time(t)
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}
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