hatter/simpledateformat
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format month

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Hatter Jiang
2020-05-30 01:34:23 +08:00
parent 38d8f7c3cf
commit bedf918455
1 changed files with 31 additions and 8 deletions
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39
src/lib.rs
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@@ -17,11 +17,10 @@ quick_error! {
enum SimpleDateFormatPart {
YearLower(usize),
YearUpper(usize),
MonthLower(usize),
MonthUpper(usize),
Month(usize),
Day,
Hour,
Minute,
Minute(usize),
Second,
LiteralChar(char),
Literal(String),
@@ -42,7 +41,12 @@ impl SimpleDateFormat {
SimpleDateFormatPart::LiteralChar(c) => ret.push(*c),
SimpleDateFormatPart::Literal(s) => ret.push_str(s),
SimpleDateFormatPart::YearLower(cnt) => ret.push_str(&format_str(date_time.year(), *cnt)),
SimpleDateFormatPart::MonthLower(cnt) => ret.push_str(&format_str(date_time.month() as i32, *cnt)),
SimpleDateFormatPart::Month(cnt) => if *cnt <= 2 {
ret.push_str(&format_str(date_time.month() as i32, *cnt))
} else {
ret.push_str(format_month(date_time.month(), *cnt));
},
SimpleDateFormatPart::Minute(cnt) => ret.push_str(&format_str(date_time.minute() as i32, *cnt)),
_ => (),
}
}
@@ -74,11 +78,11 @@ pub fn fmt(f: &str) -> Result<SimpleDateFormat, ParseError> {
} else {
is_in_quotation_mark = true;
},
',' | '.' | ':' | '-' | ' ' => parts.push(SimpleDateFormatPart::LiteralChar(c)),
',' | '.' | ':' | '-' | ' ' | '/' => parts.push(SimpleDateFormatPart::LiteralChar(c)),
'y' => parts.push(SimpleDateFormatPart::YearLower(get_all_chars(c, &mut chars))),
'Y' => parts.push(SimpleDateFormatPart::YearUpper(get_all_chars(c, &mut chars))),
'm' => parts.push(SimpleDateFormatPart::MonthLower(get_all_chars(c, &mut chars))),
'M' => parts.push(SimpleDateFormatPart::MonthUpper(get_all_chars(c, &mut chars))),
'M' => parts.push(SimpleDateFormatPart::Month(get_all_chars(c, &mut chars))),
'm' => parts.push(SimpleDateFormatPart::Minute(get_all_chars(c, &mut chars))),
_ => (),
}
}
@@ -87,6 +91,25 @@ pub fn fmt(f: &str) -> Result<SimpleDateFormat, ParseError> {
// Err(ParseError::Format(f.into()))
}
fn format_month(n: u32, cnt: usize) -> &'static str {
let is_short = cnt == 3;
match n {
1 => if is_short { "Jan" } else { "January" },
2 => if is_short { "Feb" } else { "February" },
3 => if is_short { "Mar" } else { "March" },
4 => if is_short { "Apr" } else { "April" },
5 => if is_short { "May" } else { "May" },
6 => if is_short { "Jun" } else { "June" },
7 => if is_short { "Jul" } else { "July" },
8 => if is_short { "Aug" } else { "August" },
9 => if is_short { "Sep" } else { "September" },
10 => if is_short { "Oct" } else { "October" },
11 => if is_short { "Nov" } else { "November" },
12 => if is_short { "Dec" } else { "December" },
_ => "ERR!UNKNOWN MONTH",
}
}
fn format_str(n: i32, cnt: usize) -> String {
let ret = format!("{}", n);
if cnt > ret.len() {
@@ -114,7 +137,7 @@ fn it_works() {
// println!("test output: {}", fmt("").unwrap().format_local(&Local::now()));
println!("{:?}", fmt("y yy-mm 'mm '''"));
println!("{:?}", fmt("y yy-mm'(-'m')' '[mm]'").unwrap().format_local(&Local::now()));
println!("{:?}", fmt("y yy-MM mm'(-'m')' MM MMM MMMMM '[mm]'").unwrap().format_local(&Local::now()));
assert_eq!(2 + 2, 4);
}