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use libm::{fabs, modf};
use crate::{scales, utils::f64_eq, BaseUnit, FormatSizeOptions, Kilo, ToF64, Unsigned};
pub struct ISizeFormatter<T: ToF64, O: AsRef<FormatSizeOptions>> {
value: T,
options: O,
}
impl<V: ToF64, O: AsRef<FormatSizeOptions>> ISizeFormatter<V, O> {
pub fn new(value: V, options: O) -> Self {
ISizeFormatter { value, options }
}
}
impl<T: ToF64, O: AsRef<FormatSizeOptions>> core::fmt::Display for ISizeFormatter<T, O> {
fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
let opts = self.options.as_ref();
let divider = opts.kilo.value();
let mut size: f64 = self.value.to_f64();
let mut scale_idx = 0;
if let Some(val) = opts.fixed_at {
while scale_idx != val as usize {
size /= divider;
scale_idx += 1;
}
} else {
while fabs(size) >= divider {
size /= divider;
scale_idx += 1;
}
}
let mut scale = match (opts.units, opts.long_units, opts.base_unit) {
(Kilo::Decimal, false, BaseUnit::Byte) => scales::SCALE_DECIMAL[scale_idx],
(Kilo::Decimal, true, BaseUnit::Byte) => scales::SCALE_DECIMAL_LONG[scale_idx],
(Kilo::Binary, false, BaseUnit::Byte) => scales::SCALE_BINARY[scale_idx],
(Kilo::Binary, true, BaseUnit::Byte) => scales::SCALE_BINARY_LONG[scale_idx],
(Kilo::Decimal, false, BaseUnit::Bit) => scales::SCALE_DECIMAL_BIT[scale_idx],
(Kilo::Decimal, true, BaseUnit::Bit) => scales::SCALE_DECIMAL_BIT_LONG[scale_idx],
(Kilo::Binary, false, BaseUnit::Bit) => scales::SCALE_BINARY_BIT[scale_idx],
(Kilo::Binary, true, BaseUnit::Bit) => scales::SCALE_BINARY_BIT_LONG[scale_idx],
};
// Remove "s" from the scale if the size is 1.x
let (fpart, ipart) = modf(size);
if f64_eq(ipart, 1.0)
&& (opts.long_units || (opts.base_unit == BaseUnit::Bit && scale_idx == 0))
{
scale = &scale[0..scale.len() - 1];
}
let places = if f64_eq(fpart, 0.0) {
opts.decimal_zeroes
} else {
opts.decimal_places
};
let space = if opts.space_after_value { " " } else { "" };
write!(f, "{:.*}{}{}{}", places, size, space, scale, opts.suffix)
}
}
impl<'a, U: ToF64 + Unsigned + Copy, O: AsRef<FormatSizeOptions>> From<&'a SizeFormatter<U, O>>
for ISizeFormatter<U, &'a O>
{
fn from(source: &'a SizeFormatter<U, O>) -> Self {
ISizeFormatter {
value: source.value,
options: &source.options,
}
}
}
pub struct SizeFormatter<T: ToF64 + Unsigned, O: AsRef<FormatSizeOptions>> {
value: T,
options: O,
}
impl<V: ToF64 + Unsigned, O: AsRef<FormatSizeOptions>> SizeFormatter<V, O> {
pub fn new(value: V, options: O) -> Self {
SizeFormatter { value, options }
}
}
impl<T: ToF64 + Unsigned + Copy, O: AsRef<FormatSizeOptions> + Copy> core::fmt::Display
for SizeFormatter<T, O>
{
fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
write!(f, "{}", ISizeFormatter::from(self))
}
}
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