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8731d4dfb4
* {:.PREC?} already had legitimately useful behavior (recursive formatting of structs using
fixed precision for floats) and I suspect that changes to the output there would be unwelcome.
(besides, precision introduces sinister edge cases where a number can be rounded up to one
of the thresholds)
Thus, the new behavior of Debug is, "dynamically switch to exponential, but only if there's
no precision."
* This could not be implemented in terms of float_to_decimal_common without repeating the branch
on precision, so 'float_to_general_debug' is a new function. The name is '_debug' instead of
'_common' because the considerations in the previous bullet make this logic pretty specific
to Debug.
* 'float_to_decimal_common' is now only used by Display, so I inlined the min_precision argument
and renamed the function accordingly.
56 lines
2.4 KiB
Rust
56 lines
2.4 KiB
Rust
#[test]
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fn test_format_f64() {
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assert_eq!("1", format!("{:.0}", 1.0f64));
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assert_eq!("9", format!("{:.0}", 9.4f64));
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assert_eq!("10", format!("{:.0}", 9.9f64));
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assert_eq!("9.8", format!("{:.1}", 9.849f64));
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assert_eq!("9.9", format!("{:.1}", 9.851f64));
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assert_eq!("1", format!("{:.0}", 0.5f64));
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assert_eq!("1.23456789e6", format!("{:e}", 1234567.89f64));
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assert_eq!("1.23456789e3", format!("{:e}", 1234.56789f64));
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assert_eq!("1.23456789E6", format!("{:E}", 1234567.89f64));
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assert_eq!("1.23456789E3", format!("{:E}", 1234.56789f64));
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assert_eq!("0.0", format!("{:?}", 0.0f64));
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assert_eq!("1.01", format!("{:?}", 1.01f64));
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let high_cutoff = 1e16_f64;
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assert_eq!("1e16", format!("{:?}", high_cutoff));
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assert_eq!("-1e16", format!("{:?}", -high_cutoff));
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assert!(!is_exponential(&format!("{:?}", high_cutoff * (1.0 - 2.0 * f64::EPSILON))));
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assert_eq!("-3.0", format!("{:?}", -3f64));
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assert_eq!("0.0001", format!("{:?}", 0.0001f64));
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assert_eq!("9e-5", format!("{:?}", 0.00009f64));
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assert_eq!("1234567.9", format!("{:.1?}", 1234567.89f64));
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assert_eq!("1234.6", format!("{:.1?}", 1234.56789f64));
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}
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#[test]
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fn test_format_f32() {
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assert_eq!("1", format!("{:.0}", 1.0f32));
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assert_eq!("9", format!("{:.0}", 9.4f32));
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assert_eq!("10", format!("{:.0}", 9.9f32));
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assert_eq!("9.8", format!("{:.1}", 9.849f32));
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assert_eq!("9.9", format!("{:.1}", 9.851f32));
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assert_eq!("1", format!("{:.0}", 0.5f32));
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assert_eq!("1.2345679e6", format!("{:e}", 1234567.89f32));
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assert_eq!("1.2345679e3", format!("{:e}", 1234.56789f32));
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assert_eq!("1.2345679E6", format!("{:E}", 1234567.89f32));
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assert_eq!("1.2345679E3", format!("{:E}", 1234.56789f32));
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assert_eq!("0.0", format!("{:?}", 0.0f32));
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assert_eq!("1.01", format!("{:?}", 1.01f32));
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let high_cutoff = 1e16_f32;
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assert_eq!("1e16", format!("{:?}", high_cutoff));
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assert_eq!("-1e16", format!("{:?}", -high_cutoff));
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assert!(!is_exponential(&format!("{:?}", high_cutoff * (1.0 - 2.0 * f32::EPSILON))));
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assert_eq!("-3.0", format!("{:?}", -3f32));
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assert_eq!("0.0001", format!("{:?}", 0.0001f32));
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assert_eq!("9e-5", format!("{:?}", 0.00009f32));
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assert_eq!("1234567.9", format!("{:.1?}", 1234567.89f32));
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assert_eq!("1234.6", format!("{:.1?}", 1234.56789f32));
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}
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fn is_exponential(s: &str) -> bool {
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s.contains("e") || s.contains("E")
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}
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