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some more work on printf spec

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This commit is contained in:
Terts Diepraam 2023-08-10 23:20:20 +02:00
parent 66eb64e41f
commit 407bccc54f
1 changed files with 60 additions and 18 deletions
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78
src/uucore/src/lib/features/format/spec.rs
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@ -358,20 +358,28 @@ impl Spec {
return Err(FormatError::InvalidArgument(arg));
};
match positive_sign {
PositiveSign::None => Ok(()),
PositiveSign::Plus => write!(writer, "+"),
PositiveSign::Space => write!(writer, " "),
if f.is_sign_positive() {
match positive_sign {
PositiveSign::None => Ok(()),
PositiveSign::Plus => write!(writer, "+"),
PositiveSign::Space => write!(writer, " "),
}
.map_err(FormatError::IoError)?;
}
.map_err(FormatError::IoError)?;
let s = match variant {
FloatVariant::Decimal => format_float_decimal(f, precision, case, force_decimal),
FloatVariant::Decimal => {
format_float_decimal(f, precision, case, force_decimal)
}
FloatVariant::Scientific => {
format_float_scientific(f, precision, case, force_decimal)
}
FloatVariant::Shortest => format_float_shortest(f, precision, case, force_decimal),
FloatVariant::Hexadecimal => todo!(),
FloatVariant::Shortest => {
format_float_shortest(f, precision, case, force_decimal)
}
FloatVariant::Hexadecimal => {
format_float_hexadecimal(f, precision, case, force_decimal)
}
};
match alignment {
@ -385,6 +393,15 @@ impl Spec {
}
}
fn format_float_nonfinite(f: f64, case: Case) -> String {
debug_assert!(!f.is_finite());
let mut s = format!("{f}");
if case == Case::Uppercase {
s.make_ascii_uppercase();
}
return s;
}
fn format_float_decimal(
f: f64,
precision: usize,
@ -392,11 +409,7 @@ fn format_float_decimal(
force_decimal: ForceDecimal,
) -> String {
if !f.is_finite() {
let mut s = format!("{f}");
if case == Case::Lowercase {
s.make_ascii_uppercase();
}
return s;
return format_float_nonfinite(f, case);
}
if precision == 0 && force_decimal == ForceDecimal::Yes {
@ -414,11 +427,7 @@ fn format_float_scientific(
) -> String {
// If the float is NaN, -Nan, Inf or -Inf, format like any other float
if !f.is_finite() {
let mut s = format!("{f}");
if case == Case::Lowercase {
s.make_ascii_uppercase();
}
return s;
return format_float_nonfinite(f, case);
}
let exponent: i32 = f.log10().floor() as i32;
@ -458,6 +467,39 @@ fn format_float_shortest(
}
}
fn format_float_hexadecimal(
f: f64,
precision: usize,
case: Case,
force_decimal: ForceDecimal,
) -> String {
if !f.is_finite() {
return format_float_nonfinite(f, case);
}
let (first_digit, mantissa, exponent) = if f == 0.0 {
(0, 0, 0)
} else {
let bits = f.to_bits();
let exponent_bits = ((bits >> 52) & 0x7fff) as i64;
let exponent = exponent_bits - 1023;
let mantissa = bits & 0xf_ffff_ffff_ffff;
(1, mantissa, exponent)
};
let mut s = match (precision, force_decimal) {
(0, ForceDecimal::No) => format!("0x{first_digit}p{exponent:+x}"),
(0, ForceDecimal::Yes) => format!("0x{first_digit}.p{exponent:+x}"),
_ => format!("0x{first_digit}.{mantissa:0>13x}p{exponent:+x}")
};
if case == Case::Uppercase {
s.make_ascii_uppercase();
}
return s;
}
fn resolve_asterisk(
option: Option<CanAsterisk<usize>>,
args: impl Iterator<Item = FormatArgument>,