libserialize: Always use a decimal point when emitting a float value
JSON doesn't distinguish between integer and float. They are just numbers. Also, in the current implementation, a fractional number without the fractional part is encoded without a decimal point. Thereforce, when the value is decoded, it is first rendered as Json, either I64 or U64. This reduces type safety, because while the original intention was to cast the value to float, it can also be casted to integer. As a workaround of this problem, this commit makes the encoder always emit a decimal point even if it is not necessary. If the fractional part of a float number is zero, ".0" is padded to the end of the result. [breaking-change]
This commit is contained in:
parent
f102123b65
commit
fec0f16c98
1 changed files with 4 additions and 3 deletions
|
@ -386,7 +386,8 @@ fn spaces(wr: &mut io::Writer, mut n: uint) -> Result<(), io::IoError> {
|
|||
fn fmt_number_or_null(v: f64) -> string::String {
|
||||
match v.classify() {
|
||||
FPNaN | FPInfinite => string::String::from_str("null"),
|
||||
_ => f64::to_str_digits(v, 6u)
|
||||
_ if v.fract() != 0f64 => f64::to_str_digits(v, 6u),
|
||||
_ => f64::to_str_digits(v, 6u) + ".0",
|
||||
}
|
||||
}
|
||||
|
||||
|
@ -2504,8 +2505,8 @@ mod tests {
|
|||
|
||||
#[test]
|
||||
fn test_write_f64() {
|
||||
assert_eq!(F64(3.0).to_string().into_string(), "3");
|
||||
assert_eq!(F64(3.0).to_pretty_str().into_string(), "3");
|
||||
assert_eq!(F64(3.0).to_string().into_string(), "3.0");
|
||||
assert_eq!(F64(3.0).to_pretty_str().into_string(), "3.0");
|
||||
|
||||
assert_eq!(F64(3.1).to_string().into_string(), "3.1");
|
||||
assert_eq!(F64(3.1).to_pretty_str().into_string(), "3.1");
|
||||
|
|
Loading…
Reference in a new issue