new formatting specifiers to `strftime` syntax.
- Padding modifiers `%_?`, `%-?` and `%0?` are implemented. They are glibc extensions which seem to be reasonably widespread (e.g. Ruby). - Added `%:z` specifier and corresponding formatting items which is essentially same to `%z` but with a colon. - Added a new specifier `%.f` which precision adapts from the input. Also clearly documented the differences between `%f` and `%.f`. (#40)
This commit is contained in:
Kang Seonghoon
parent
5bff8170ff
commit
1f40b03ab9
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@ -133,12 +133,16 @@ pub enum Fixed {
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///
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///
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/// In the parser, the colon can be omitted and/or surrounded with any amount of whitespaces.
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/// In the parser, the colon can be omitted and/or surrounded with any amount of whitespaces.
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/// The offset is limited from `-24:00` to `+24:00`, which is same to `FixedOffset`'s range.
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/// The offset is limited from `-24:00` to `+24:00`, which is same to `FixedOffset`'s range.
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TimezoneOffset,
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TimezoneOffsetColon,
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/// Offset from the local time to UTC (`+09:00` or `-04:00` or `Z`).
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/// Offset from the local time to UTC (`+09:00` or `-04:00` or `Z`).
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///
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///
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/// In the parser, the colon can be omitted and/or surrounded with any amount of whitespaces,
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/// In the parser, the colon can be omitted and/or surrounded with any amount of whitespaces,
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/// and `Z` can be either in upper case or in lower case.
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/// and `Z` can be either in upper case or in lower case.
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/// The offset is limited from `-24:00` to `+24:00`, which is same to `FixedOffset`'s range.
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/// The offset is limited from `-24:00` to `+24:00`, which is same to `FixedOffset`'s range.
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TimezoneOffsetColonZ,
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/// Same to `TimezoneOffsetColon` but prints no colon. Parsing allows an optional colon.
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TimezoneOffset,
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/// Same to `TimezoneOffsetColonZ` but prints no colon. Parsing allows an optional colon.
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TimezoneOffsetZ,
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TimezoneOffsetZ,
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/// RFC 2822 date and time syntax. Commonly used for email and MIME date and time.
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/// RFC 2822 date and time syntax. Commonly used for email and MIME date and time.
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RFC2822,
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RFC2822,
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@ -364,6 +368,10 @@ pub fn format<'a, I>(w: &mut fmt::Formatter, date: Option<&NaiveDate>, time: Opt
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}),
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}),
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TimezoneName =>
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TimezoneName =>
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off.map(|&(ref name, _)| write!(w, "{}", *name)),
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off.map(|&(ref name, _)| write!(w, "{}", *name)),
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TimezoneOffsetColon =>
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off.map(|&(_, off)| write_local_minus_utc(w, off, false, true)),
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TimezoneOffsetColonZ =>
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off.map(|&(_, off)| write_local_minus_utc(w, off, true, true)),
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TimezoneOffset =>
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TimezoneOffset =>
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off.map(|&(_, off)| write_local_minus_utc(w, off, false, false)),
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off.map(|&(_, off)| write_local_minus_utc(w, off, false, false)),
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TimezoneOffsetZ =>
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TimezoneOffsetZ =>
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@ -309,13 +309,13 @@ pub fn parse<'a, I>(parsed: &mut Parsed, mut s: &str, items: I) -> ParseResult<(
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TimezoneName => return Err(BAD_FORMAT),
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TimezoneName => return Err(BAD_FORMAT),
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TimezoneOffset => {
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TimezoneOffsetColon | TimezoneOffset => {
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let offset = try_consume!(scan::timezone_offset(s.trim_left(),
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let offset = try_consume!(scan::timezone_offset(s.trim_left(),
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scan::colon_or_space));
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scan::colon_or_space));
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try!(parsed.set_offset(offset as i64));
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try!(parsed.set_offset(offset as i64));
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}
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}
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TimezoneOffsetZ => {
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TimezoneOffsetColonZ | TimezoneOffsetZ => {
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let offset = try_consume!(scan::timezone_offset_zulu(s.trim_left(),
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let offset = try_consume!(scan::timezone_offset_zulu(s.trim_left(),
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scan::colon_or_space));
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scan::colon_or_space));
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try!(parsed.set_offset(offset as i64));
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try!(parsed.set_offset(offset as i64));
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@ -22,7 +22,7 @@ Spec. | Example | Description
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`%h` | `Jul` | Same to `%b`.
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`%h` | `Jul` | Same to `%b`.
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`%d` | `08` | Day number (01--31), zero-padded to 2 digits.
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`%d` | `08` | Day number (01--31), zero-padded to 2 digits.
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`%e` | ` 8` | Same to `%d` but space-padded.
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`%e` | ` 8` | Same to `%d` but space-padded. Same to `%_d`.
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`%a` | `Sun` | Abbreviated weekday name. Always 3 letters.
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`%a` | `Sun` | Abbreviated weekday name. Always 3 letters.
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`%A` | `Sunday` | Full weekday name. Also accepts corresponding abbreviation in parsing.
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`%A` | `Sunday` | Full weekday name. Also accepts corresponding abbreviation in parsing.
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@ -45,16 +45,17 @@ Spec. | Example | Description
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| | **TIME SPECIFIERS:**
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| | **TIME SPECIFIERS:**
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`%H` | `00` | Hour number (00--23), zero-padded to 2 digits.
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`%H` | `00` | Hour number (00--23), zero-padded to 2 digits.
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`%k` | ` 0` | Same to `%H` but space-padded.
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`%k` | ` 0` | Same to `%H` but space-padded. Same to `%_H`.
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`%I` | `12` | Hour number in 12-hour clocks (01--12), zero-padded to 2 digits.
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`%I` | `12` | Hour number in 12-hour clocks (01--12), zero-padded to 2 digits.
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`%l` | `12` | Same to `%I` but space-padded.
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`%l` | `12` | Same to `%I` but space-padded. Same to `%_I`.
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`%P` | `am` | `am` or `pm` in 12-hour clocks.
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`%P` | `am` | `am` or `pm` in 12-hour clocks.
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`%p` | `AM` | `AM` or `PM` in 12-hour clocks.
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`%p` | `AM` | `AM` or `PM` in 12-hour clocks.
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`%M` | `34` | Minute number (00--59), zero-padded to 2 digits.
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`%M` | `34` | Minute number (00--59), zero-padded to 2 digits.
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`%S` | `60` | Second number (00--60), zero-padded to 2 digits. [5]
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`%S` | `60` | Second number (00--60), zero-padded to 2 digits. [5]
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`%f` | `026490000` | The number of nanoseconds since last whole second, zero-padded to 9 digits.
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`%f` | `026490000` | The fractional seconds (in nanoseconds) since last whole second. [8]
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`%.f` | `.026490` | Similar to `.%f` but left-aligned. [8]
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`%R` | `00:34` | Hour-minute format. Same to `%H:%M`.
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`%R` | `00:34` | Hour-minute format. Same to `%H:%M`.
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`%T` | `00:34:60` | Hour-minute-second format. Same to `%H:%M:%S`.
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`%T` | `00:34:60` | Hour-minute-second format. Same to `%H:%M:%S`.
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@ -64,6 +65,7 @@ Spec. | Example | Description
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| | **TIME ZONE SPECIFIERS:**
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| | **TIME ZONE SPECIFIERS:**
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`%Z` | `ACST` | *Formatting only:* Local time zone name.
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`%Z` | `ACST` | *Formatting only:* Local time zone name.
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`%z` | `+0930` | Offset from the local time to UTC (with UTC being `+0000`).
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`%z` | `+0930` | Offset from the local time to UTC (with UTC being `+0000`).
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`%:z` | `+09:30` | Same to `%z` but with a colon.
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| | **DATE & TIME SPECIFIERS:**
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| | **DATE & TIME SPECIFIERS:**
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`%c` | `Sun Jul 8 00:34:60 2001` | `ctime` date & time format. Same to `%a %b %e %T %Y` sans `\n`.
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`%c` | `Sun Jul 8 00:34:60 2001` | `ctime` date & time format. Same to `%a %b %e %T %Y` sans `\n`.
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@ -76,6 +78,15 @@ Spec. | Example | Description
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`%n` | | Literal newline (`\n`).
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`%n` | | Literal newline (`\n`).
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`%%` | | Literal percent sign.
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`%%` | | Literal percent sign.
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It is possible to override the default padding behavior of numeric specifiers `%?`.
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This is not allowed for other specifiers and will result in the `BAD_FORMAT` error.
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Modifier | Description
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-------- | -----------
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`%-?` | Suppresses any padding including spaces and zeroes. (e.g. `%j` = `012`, `%-j` = `12`)
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`%_?` | Uses spaces as a padding. (e.g. `%j` = `012`, `%_j` = ` 12`)
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`%0?` | Uses zeroes as a padding. (e.g. `%e` = ` 9`, `%0e` = `09`)
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Notes:
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Notes:
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1. `%Y`:
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1. `%Y`:
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@ -96,15 +107,27 @@ Notes:
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It accounts for leap seconds, so `60` is possible.
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It accounts for leap seconds, so `60` is possible.
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6. `%+`:
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6. `%+`:
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This one is close to, but not identical to, `%Y-%m-%dT%H:%M:%S%z`.
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This one is close to, but not identical to, `%Y-%m-%dT%H:%M:%S%.f%z`.
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The main differences are a colon in `%z` and fractional seconds (which width adapts
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The main differences are a colon in `%z`.
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accordingly to the number of trailing zeroes).
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7. `%s`:
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7. `%s`:
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This is not padded and can be negative.
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This is not padded and can be negative.
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For the purpose of Chrono, it only accounts for non-leap seconds
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For the purpose of Chrono, it only accounts for non-leap seconds
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so it slightly differs from ISO C `strftime` behavior.
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so it slightly differs from ISO C `strftime` behavior.
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8. `%f`, `%.f`:
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The default `%f` is right-aligned and always zero-padded to 9 digits
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for the compatibility with glibc and others,
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so it always counts the number of nanoseconds since the last whole second.
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E.g. 7ms after the last second will print `007000000`, and parsing `7000000` will yield the same.
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The variant `%.f` is left-aligned and print 0, 3, 6 or 9 fractional digits
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according to the precision. E.g. 70ms after the last second under `%.f` will print `.070`
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(note: not `.07`), and parsing `.07`, `.070000` etc. will yield the same.
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Note that they can print or read nothing if the fractional part is zero or
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the next character is not `.`.
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*/
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*/
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use super::{Item, Numeric, Fixed, Pad};
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use super::{Item, Numeric, Fixed, Pad};
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@ -147,11 +170,26 @@ impl<'a> Iterator for StrftimeItems<'a> {
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Some('%') => {
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Some('%') => {
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self.remainder = &self.remainder[1..];
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self.remainder = &self.remainder[1..];
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let spec = match self.remainder.chars().next() {
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macro_rules! next {
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Some(x) => x,
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() => (
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None => return Some(Item::Error), // premature end of string
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match self.remainder.chars().next() {
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Some(x) => {
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self.remainder = &self.remainder[x.len_utf8()..];
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x
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},
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None => return Some(Item::Error), // premature end of string
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}
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)
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}
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let spec = next!();
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let pad_override = match spec {
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'-' => Some(Pad::None),
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'0' => Some(Pad::Zero),
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'_' => Some(Pad::Space),
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_ => None,
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};
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};
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self.remainder = &self.remainder[spec.len_utf8()..];
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let spec = if pad_override.is_some() { next!() } else { spec };
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macro_rules! recons {
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macro_rules! recons {
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[$head:expr, $($tail:expr),+] => ({
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[$head:expr, $($tail:expr),+] => ({
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@ -161,62 +199,77 @@ impl<'a> Iterator for StrftimeItems<'a> {
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})
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})
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}
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}
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match spec {
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let item = match spec {
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'A' => Some(fix!(LongWeekdayName)),
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'A' => fix!(LongWeekdayName),
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'B' => Some(fix!(LongMonthName)),
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'B' => fix!(LongMonthName),
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'C' => Some(num0!(YearDiv100)),
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'C' => num0!(YearDiv100),
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'D' => Some(recons![num0!(Month), lit!("/"), num0!(Day), lit!("/"),
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'D' => recons![num0!(Month), lit!("/"), num0!(Day), lit!("/"),
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num0!(YearMod100)]),
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num0!(YearMod100)],
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'F' => Some(recons![num0!(Year), lit!("-"), num0!(Month), lit!("-"),
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'F' => recons![num0!(Year), lit!("-"), num0!(Month), lit!("-"), num0!(Day)],
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num0!(Day)]),
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'G' => num0!(IsoYear),
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'G' => Some(num0!(IsoYear)),
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'H' => num0!(Hour),
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'H' => Some(num0!(Hour)),
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'I' => num0!(Hour12),
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'I' => Some(num0!(Hour12)),
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'M' => num0!(Minute),
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'M' => Some(num0!(Minute)),
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'P' => fix!(LowerAmPm),
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'P' => Some(fix!(LowerAmPm)),
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'R' => recons![num0!(Hour), lit!(":"), num0!(Minute)],
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'R' => Some(recons![num0!(Hour), lit!(":"), num0!(Minute)]),
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'S' => num0!(Second),
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'S' => Some(num0!(Second)),
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'T' => recons![num0!(Hour), lit!(":"), num0!(Minute), lit!(":"), num0!(Second)],
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'T' => Some(recons![num0!(Hour), lit!(":"), num0!(Minute), lit!(":"),
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'U' => num0!(WeekFromSun),
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num0!(Second)]),
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'V' => num0!(IsoWeek),
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'U' => Some(num0!(WeekFromSun)),
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'W' => num0!(WeekFromMon),
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'V' => Some(num0!(IsoWeek)),
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'X' => recons![num0!(Hour), lit!(":"), num0!(Minute), lit!(":"), num0!(Second)],
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'W' => Some(num0!(WeekFromMon)),
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'Y' => num0!(Year),
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'X' => Some(recons![num0!(Hour), lit!(":"), num0!(Minute), lit!(":"),
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'Z' => fix!(TimezoneName),
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num0!(Second)]),
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'a' => fix!(ShortWeekdayName),
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'Y' => Some(num0!(Year)),
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'b' => fix!(ShortMonthName),
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'Z' => Some(fix!(TimezoneName)),
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'c' => recons![fix!(ShortWeekdayName), sp!(" "), fix!(ShortMonthName),
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'a' => Some(fix!(ShortWeekdayName)),
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sp!(" "), nums!(Day), sp!(" "), num0!(Hour), lit!(":"),
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'b' => Some(fix!(ShortMonthName)),
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num0!(Minute), lit!(":"), num0!(Second), sp!(" "), num0!(Year)],
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'c' => Some(recons![fix!(ShortWeekdayName), sp!(" "), fix!(ShortMonthName),
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'd' => num0!(Day),
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sp!(" "), nums!(Day), sp!(" "), num0!(Hour), lit!(":"),
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'e' => nums!(Day),
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num0!(Minute), lit!(":"), num0!(Second), sp!(" "),
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'f' => num0!(Nanosecond),
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num0!(Year)]),
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'g' => num0!(IsoYearMod100),
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'd' => Some(num0!(Day)),
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'h' => fix!(ShortMonthName),
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'e' => Some(nums!(Day)),
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'j' => num0!(Ordinal),
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'f' => Some(num0!(Nanosecond)),
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'k' => nums!(Hour),
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'g' => Some(num0!(IsoYearMod100)),
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'l' => nums!(Hour12),
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'h' => Some(fix!(ShortMonthName)),
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'm' => num0!(Month),
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'j' => Some(num0!(Ordinal)),
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'n' => sp!("\n"),
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'k' => Some(nums!(Hour)),
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'p' => fix!(UpperAmPm),
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'l' => Some(nums!(Hour12)),
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'r' => recons![num0!(Hour12), lit!(":"), num0!(Minute), lit!(":"),
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'm' => Some(num0!(Month)),
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num0!(Second), sp!(" "), fix!(UpperAmPm)],
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'n' => Some(sp!("\n")),
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's' => num!(Timestamp),
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'p' => Some(fix!(UpperAmPm)),
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't' => sp!("\t"),
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'r' => Some(recons![num0!(Hour12), lit!(":"), num0!(Minute), lit!(":"),
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'u' => num!(WeekdayFromMon),
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num0!(Second), sp!(" "), fix!(UpperAmPm)]),
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'v' => recons![nums!(Day), lit!("-"), fix!(ShortMonthName), lit!("-"),
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's' => Some(num!(Timestamp)),
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num0!(Year)],
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't' => Some(sp!("\t")),
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'w' => num!(NumDaysFromSun),
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'u' => Some(num!(WeekdayFromMon)),
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'x' => recons![num0!(Month), lit!("/"), num0!(Day), lit!("/"),
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'v' => Some(recons![nums!(Day), lit!("-"), fix!(ShortMonthName), lit!("-"),
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num0!(YearMod100)],
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num0!(Year)]),
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'y' => num0!(YearMod100),
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'w' => Some(num!(NumDaysFromSun)),
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'z' => fix!(TimezoneOffset),
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'x' => Some(recons![num0!(Month), lit!("/"), num0!(Day), lit!("/"),
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'+' => fix!(RFC3339),
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num0!(YearMod100)]),
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':' => match next!() {
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'y' => Some(num0!(YearMod100)),
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'z' => fix!(TimezoneOffsetColon),
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'z' => Some(fix!(TimezoneOffset)),
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_ => Item::Error,
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'+' => Some(fix!(RFC3339)),
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},
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'%' => Some(lit!("%")),
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'.' => match next!() {
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_ => Some(Item::Error), // no such specifier
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'f' => fix!(Nanosecond),
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_ => Item::Error,
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},
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'%' => lit!("%"),
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_ => Item::Error, // no such specifier
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};
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// adjust `item` if we have any padding modifier
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if let Some(new_pad) = pad_override {
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match item {
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Item::Numeric(kind, _pad) if self.recons.is_empty() =>
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Some(Item::Numeric(kind, new_pad)),
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_ => Some(Item::Error), // no reconstructed or non-numeric item allowed
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}
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} else {
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Some(item)
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}
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}
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},
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},
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@ -273,6 +326,21 @@ fn test_strftime_items() {
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||||||
assert_eq!(parse_and_collect("foo%?"), [Item::Error]);
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assert_eq!(parse_and_collect("foo%?"), [Item::Error]);
|
||||||
assert_eq!(parse_and_collect("bar%42"), [Item::Error]);
|
assert_eq!(parse_and_collect("bar%42"), [Item::Error]);
|
||||||
assert_eq!(parse_and_collect("quux% +"), [Item::Error]);
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assert_eq!(parse_and_collect("quux% +"), [Item::Error]);
|
||||||
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assert_eq!(parse_and_collect("%.Z"), [Item::Error]);
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||||||
|
assert_eq!(parse_and_collect("%:Z"), [Item::Error]);
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||||||
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assert_eq!(parse_and_collect("%-Z"), [Item::Error]);
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||||||
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assert_eq!(parse_and_collect("%0Z"), [Item::Error]);
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||||||
|
assert_eq!(parse_and_collect("%_Z"), [Item::Error]);
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||||||
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assert_eq!(parse_and_collect("%.j"), [Item::Error]);
|
||||||
|
assert_eq!(parse_and_collect("%:j"), [Item::Error]);
|
||||||
|
assert_eq!(parse_and_collect("%-j"), [num!(Ordinal)]);
|
||||||
|
assert_eq!(parse_and_collect("%0j"), [num0!(Ordinal)]);
|
||||||
|
assert_eq!(parse_and_collect("%_j"), [nums!(Ordinal)]);
|
||||||
|
assert_eq!(parse_and_collect("%.e"), [Item::Error]);
|
||||||
|
assert_eq!(parse_and_collect("%:e"), [Item::Error]);
|
||||||
|
assert_eq!(parse_and_collect("%-e"), [num!(Day)]);
|
||||||
|
assert_eq!(parse_and_collect("%0e"), [num0!(Day)]);
|
||||||
|
assert_eq!(parse_and_collect("%_e"), [nums!(Day)]);
|
||||||
}
|
}
|
||||||
|
|
||||||
#[cfg(test)]
|
#[cfg(test)]
|
||||||
|
|
@ -292,6 +360,7 @@ fn test_strftime_docs() {
|
||||||
assert_eq!(dt.format("%h").to_string(), "Jul");
|
assert_eq!(dt.format("%h").to_string(), "Jul");
|
||||||
assert_eq!(dt.format("%d").to_string(), "08");
|
assert_eq!(dt.format("%d").to_string(), "08");
|
||||||
assert_eq!(dt.format("%e").to_string(), " 8");
|
assert_eq!(dt.format("%e").to_string(), " 8");
|
||||||
|
assert_eq!(dt.format("%e").to_string(), dt.format("%_d").to_string());
|
||||||
assert_eq!(dt.format("%a").to_string(), "Sun");
|
assert_eq!(dt.format("%a").to_string(), "Sun");
|
||||||
assert_eq!(dt.format("%A").to_string(), "Sunday");
|
assert_eq!(dt.format("%A").to_string(), "Sunday");
|
||||||
assert_eq!(dt.format("%w").to_string(), "0");
|
assert_eq!(dt.format("%w").to_string(), "0");
|
||||||
|
|
@ -310,13 +379,16 @@ fn test_strftime_docs() {
|
||||||
// time specifiers
|
// time specifiers
|
||||||
assert_eq!(dt.format("%H").to_string(), "00");
|
assert_eq!(dt.format("%H").to_string(), "00");
|
||||||
assert_eq!(dt.format("%k").to_string(), " 0");
|
assert_eq!(dt.format("%k").to_string(), " 0");
|
||||||
|
assert_eq!(dt.format("%k").to_string(), dt.format("%_H").to_string());
|
||||||
assert_eq!(dt.format("%I").to_string(), "12");
|
assert_eq!(dt.format("%I").to_string(), "12");
|
||||||
assert_eq!(dt.format("%l").to_string(), "12");
|
assert_eq!(dt.format("%l").to_string(), "12");
|
||||||
|
assert_eq!(dt.format("%l").to_string(), dt.format("%_I").to_string());
|
||||||
assert_eq!(dt.format("%P").to_string(), "am");
|
assert_eq!(dt.format("%P").to_string(), "am");
|
||||||
assert_eq!(dt.format("%p").to_string(), "AM");
|
assert_eq!(dt.format("%p").to_string(), "AM");
|
||||||
assert_eq!(dt.format("%M").to_string(), "34");
|
assert_eq!(dt.format("%M").to_string(), "34");
|
||||||
assert_eq!(dt.format("%S").to_string(), "60");
|
assert_eq!(dt.format("%S").to_string(), "60");
|
||||||
assert_eq!(dt.format("%f").to_string(), "026490000");
|
assert_eq!(dt.format("%f").to_string(), "026490000");
|
||||||
|
assert_eq!(dt.format("%.f").to_string(), ".026490");
|
||||||
assert_eq!(dt.format("%R").to_string(), "00:34");
|
assert_eq!(dt.format("%R").to_string(), "00:34");
|
||||||
assert_eq!(dt.format("%T").to_string(), "00:34:60");
|
assert_eq!(dt.format("%T").to_string(), "00:34:60");
|
||||||
assert_eq!(dt.format("%X").to_string(), "00:34:60");
|
assert_eq!(dt.format("%X").to_string(), "00:34:60");
|
||||||
|
|
@ -325,6 +397,7 @@ fn test_strftime_docs() {
|
||||||
// time zone specifiers
|
// time zone specifiers
|
||||||
//assert_eq!(dt.format("%Z").to_string(), "ACST");
|
//assert_eq!(dt.format("%Z").to_string(), "ACST");
|
||||||
assert_eq!(dt.format("%z").to_string(), "+0930");
|
assert_eq!(dt.format("%z").to_string(), "+0930");
|
||||||
|
assert_eq!(dt.format("%:z").to_string(), "+09:30");
|
||||||
|
|
||||||
// date & time specifiers
|
// date & time specifiers
|
||||||
assert_eq!(dt.format("%c").to_string(), "Sun Jul 8 00:34:60 2001");
|
assert_eq!(dt.format("%c").to_string(), "Sun Jul 8 00:34:60 2001");
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue