std: add a pure rust strftime formatter.
This commit is contained in:
Erick Tryzelaar
parent
4a4889859e
commit
ff9305cd99
@ -116,6 +116,175 @@ fn now() -> tm {
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at(get_time())
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}
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fn strftime(format: str, tm: tm) -> str {
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fn parse_type(ch: char, tm: tm) -> str {
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//FIXME: Implement missing types.
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alt check ch {
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'A' {
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alt check tm.tm_wday as int {
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0 { "Sunday" }
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1 { "Monday" }
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2 { "Tuesday" }
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3 { "Wednesday" }
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4 { "Thursday" }
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5 { "Friday" }
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6 { "Saturday" }
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}
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}
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'a' {
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alt check tm.tm_wday as int {
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0 { "Sun" }
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1 { "Mon" }
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2 { "Tue" }
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3 { "Wed" }
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4 { "Thu" }
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5 { "Fri" }
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6 { "Sat" }
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}
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}
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'B' {
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alt check tm.tm_mon as int {
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0 { "January" }
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1 { "February" }
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2 { "March" }
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3 { "April" }
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4 { "May" }
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5 { "June" }
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6 { "July" }
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7 { "August" }
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8 { "September" }
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9 { "October" }
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10 { "November" }
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11 { "December" }
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}
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}
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'b' | 'h' {
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alt check tm.tm_mon as int {
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0 { "Jan" }
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1 { "Feb" }
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2 { "Mar" }
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3 { "Apr" }
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4 { "May" }
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5 { "Jun" }
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6 { "Jul" }
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7 { "Aug" }
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8 { "Sep" }
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9 { "Oct" }
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10 { "Nov" }
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11 { "Dec" }
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}
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}
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'C' { #fmt("%02d", (tm.tm_year as int + 1900) / 100) }
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'c' {
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#fmt("%s %s %s %s %s",
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parse_type('a', tm),
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parse_type('b', tm),
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parse_type('e', tm),
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parse_type('T', tm),
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parse_type('Y', tm))
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}
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'D' | 'x' {
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#fmt("%s/%s/%s",
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parse_type('m', tm),
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parse_type('d', tm),
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parse_type('y', tm))
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}
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'd' { #fmt("%02d", tm.tm_mday as int) }
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'e' { #fmt("%2d", tm.tm_mday as int) }
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'F' {
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#fmt("%s-%s-%s",
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parse_type('Y', tm),
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parse_type('m', tm),
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parse_type('d', tm))
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}
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//'G' {}
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//'g' {}
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'H' { #fmt("%02d", tm.tm_hour as int) }
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'I' {
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let mut h = tm.tm_hour as int;
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if h == 0 { h = 12 }
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if h > 12 { h -= 12 }
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#fmt("%02d", h)
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}
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'j' { #fmt("%03d", tm.tm_yday as int + 1) }
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'k' { #fmt("%2d", tm.tm_hour as int) }
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'l' {
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let mut h = tm.tm_hour as int;
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if h == 0 { h = 12 }
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if h > 12 { h -= 12 }
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#fmt("%2d", h)
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}
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'M' { #fmt("%02d", tm.tm_min as int) }
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'm' { #fmt("%02d", tm.tm_mon as int + 1) }
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'n' { "\n" }
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'P' { if tm.tm_hour as int < 12 { "am" } else { "pm" } }
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'p' { if tm.tm_hour as int < 12 { "AM" } else { "PM" } }
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'R' {
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#fmt("%s:%s",
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parse_type('H', tm),
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parse_type('M', tm))
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}
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'r' {
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#fmt("%s:%s:%s %s",
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parse_type('I', tm),
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parse_type('M', tm),
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parse_type('S', tm),
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parse_type('p', tm))
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}
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'S' { #fmt("%02d", tm.tm_sec as int) }
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's' { #fmt("%d", tm.to_timespec().sec as int) }
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'T' | 'X' {
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#fmt("%s:%s:%s",
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parse_type('H', tm),
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parse_type('M', tm),
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parse_type('S', tm))
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}
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't' { "\t" }
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//'U' {}
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'u' {
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let i = tm.tm_wday as int;
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int::str(if i == 0 { 7 } else { i })
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}
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//'V' {}
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'v' {
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#fmt("%s-%s-%s",
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parse_type('e', tm),
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parse_type('b', tm),
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parse_type('Y', tm))
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}
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//'W' {}
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'w' { int::str(tm.tm_wday as int) }
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//'X' {}
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//'x' {}
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'Y' { int::str(tm.tm_year as int + 1900) }
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'y' { #fmt("%02d", (tm.tm_year as int + 1900) % 100) }
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'Z' { tm.tm_zone }
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'z' {
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let sign = if tm.tm_gmtoff > 0_i32 { '+' } else { '-' };
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let mut m = i32::abs(tm.tm_gmtoff) / 60_i32;
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let h = m / 60_i32;
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m -= h * 60_i32;
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#fmt("%c%02d%02d", sign, h as int, m as int)
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}
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//'+' {}
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'%' { "%" }
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}
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}
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let mut buf = "";
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io::with_str_reader(format) { |rdr|
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while !rdr.eof() {
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alt rdr.read_char() {
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'%' { buf += parse_type(rdr.read_char(), tm); }
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ch { str::push_char(buf, ch); }
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}
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}
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}
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buf
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}
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impl tm for tm {
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#[doc = "Convert time to the seconds from January 1, 1970"]
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fn to_timespec() -> timespec {
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@ -137,6 +306,58 @@ fn to_local() -> tm {
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fn to_utc() -> tm {
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at_utc(self.to_timespec())
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}
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#[doc = "
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Return a string of the current time in the form
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\"Thu Jan 1 00:00:00 1970\".
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"]
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fn ctime() -> str { self.strftime("%c") }
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#[doc = "Formats the time according to the format string."]
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fn strftime(format: str) -> str { strftime(format, self) }
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#[doc = "
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Returns a time string formatted according to RFC 822.
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local: \"Thu, 22 Mar 2012 07:53:18 PST\"
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utc: \"Thu, 22 Mar 2012 14:53:18 UTC\"
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"]
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fn rfc822() -> str {
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if self.tm_gmtoff == 0_i32 {
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self.strftime("%a, %d %b %Y %T GMT")
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} else {
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self.strftime("%a, %d %b %Y %T %Z")
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}
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}
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#[doc = "
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Returns a time string formatted according to RFC 822 with Zulu time.
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local: \"Thu, 22 Mar 2012 07:53:18 -0700\"
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utc: \"Thu, 22 Mar 2012 14:53:18 -0000\"
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"]
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fn rfc822z() -> str {
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self.strftime("%a, %d %b %Y %T %z")
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}
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#[doc = "
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Returns a time string formatted according to ISO 8601.
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local: \"2012-02-22T07:53:18-07:00\"
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utc: \"2012-02-22T14:53:18Z\"
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"]
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fn rfc3339() -> str {
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if self.tm_gmtoff == 0_i32 {
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self.strftime("%Y-%m-%dT%H:%M:%SZ")
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} else {
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let s = self.strftime("%Y-%m-%dT%H:%M:%S");
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let sign = if self.tm_gmtoff > 0_i32 { '+' } else { '-' };
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let mut m = i32::abs(self.tm_gmtoff) / 60_i32;
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let h = m / 60_i32;
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m -= h * 60_i32;
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s + #fmt("%c%02d:%02d", sign, h as int, m as int)
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}
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}
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}
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#[cfg(test)]
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@ -258,4 +479,89 @@ fn test_conversions() {
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assert utc.to_local() == local;
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assert utc.to_local().to_utc() == utc;
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}
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#[test]
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fn test_ctime() {
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os::setenv("TZ", "America/Los_Angeles");
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let time = { sec: 1234567890_i64, nsec: 54321_i32 };
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let utc = at_utc(time);
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let local = at(time);
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assert utc.ctime() == "Fri Feb 13 23:31:30 2009";
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assert local.ctime() == "Fri Feb 13 15:31:30 2009";
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}
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#[test]
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fn test_strftime() {
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os::setenv("TZ", "America/Los_Angeles");
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let time = { sec: 1234567890_i64, nsec: 54321_i32 };
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let utc = at_utc(time);
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let local = at(time);
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assert local.strftime("") == "";
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assert local.strftime("%A") == "Friday";
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assert local.strftime("%a") == "Fri";
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assert local.strftime("%B") == "February";
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assert local.strftime("%b") == "Feb";
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assert local.strftime("%C") == "20";
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assert local.strftime("%c") == "Fri Feb 13 15:31:30 2009";
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assert local.strftime("%D") == "02/13/09";
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assert local.strftime("%d") == "13";
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assert local.strftime("%e") == "13";
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assert local.strftime("%F") == "2009-02-13";
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// assert local.strftime("%G") == "2009";
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// assert local.strftime("%g") == "09";
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assert local.strftime("%H") == "15";
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assert local.strftime("%I") == "03";
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assert local.strftime("%j") == "044";
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assert local.strftime("%k") == "15";
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assert local.strftime("%l") == " 3";
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assert local.strftime("%M") == "31";
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assert local.strftime("%m") == "02";
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assert local.strftime("%n") == "\n";
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assert local.strftime("%P") == "pm";
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assert local.strftime("%p") == "PM";
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assert local.strftime("%R") == "15:31";
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assert local.strftime("%r") == "03:31:30 PM";
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assert local.strftime("%S") == "30";
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assert local.strftime("%s") == "1234567890";
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assert local.strftime("%T") == "15:31:30";
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assert local.strftime("%t") == "\t";
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// assert local.strftime("%U") == "06";
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assert local.strftime("%u") == "5";
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// assert local.strftime("%V") == "07";
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assert local.strftime("%v") == "13-Feb-2009";
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// assert local.strftime("%W") == "06";
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assert local.strftime("%w") == "5";
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// handle "%X"
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// handle "%x"
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assert local.strftime("%Y") == "2009";
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assert local.strftime("%y") == "09";
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// FIXME: We should probably standardize on the timezone
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// abbreviation.
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let zone = local.strftime("%Z");
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assert zone == "PST" || zone == "Pacific Standard Time";
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assert local.strftime("%z") == "-0800";
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assert local.strftime("%%") == "%";
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// FIXME: We should probably standardize on the timezone
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// abbreviation.
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let rfc822 = local.rfc822();
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let prefix = "Fri, 13 Feb 2009 15:31:30 ";
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assert rfc822 == prefix + "PST" ||
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rfc822 == prefix + "Pacific Standard Time";
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assert local.ctime() == "Fri Feb 13 15:31:30 2009";
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assert local.rfc822z() == "Fri, 13 Feb 2009 15:31:30 -0800";
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assert local.rfc3339() == "2009-02-13T15:31:30-08:00";
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assert utc.ctime() == "Fri Feb 13 23:31:30 2009";
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assert utc.rfc822() == "Fri, 13 Feb 2009 23:31:30 GMT";
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assert utc.rfc822z() == "Fri, 13 Feb 2009 23:31:30 -0000";
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assert utc.rfc3339() == "2009-02-13T23:31:30Z";
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}
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}
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