float-format 0.1.3

A library for custom floating point number format
Documentation 
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use float_format::*;

#[test]
fn print_test() {
    let float = Float::from_str(
        Format::new_ieee_excess(16, 64),
        "-0",
    ).unwrap();

    println!("{:.8}", float);

    assert_eq!(Float::from(0.2f32).to_f32(), 0.2f32);

    #[cfg(target_pointer_width = "64")]
    assert_eq!(Float::from(0.2f64).to_f64(), 0.2f64);
}

#[test]
fn prim_float_types() {
    assert_eq!(Float::from(0.2f32).to_f32(), 0.2f32);
    assert_eq!(Float::from(0.2f32).to_f32_raw(), 0.2f32);
    assert_eq!(Float::from(0.2f32).to_f64(), 0.2f32 as f64);

    #[cfg(target_pointer_width = "64")]
    assert_eq!(Float::from(0.2f64).to_f64(), 0.2f64);
    #[cfg(target_pointer_width = "64")]
    assert_eq!(Float::from(0.2f64).to_f64_raw(), 0.2f64);
    #[cfg(target_pointer_width = "64")]
    assert_eq!(Float::from(0.2f64).to_f32(), 0.2f64 as f32);
}

#[test]
fn radices() {
    let bin = Float::from_bits(
        Format::ieee_binary32(),
        BitPattern::from_str("0b0100_0110_0100_0000_1110_0110_0110_0110").unwrap(),
    ).unwrap();
    
    let oct = Float::from_bits(
        Format::ieee_binary32(),
        BitPattern::from_str("0o10620163146").unwrap(),
    ).unwrap();
    
    let dec = Float::from_bits(
        Format::ieee_binary32(),
        BitPattern::from_str("0d1178658406").unwrap(),
    ).unwrap();

    let hex = Float::from_bits(
        Format::ieee_binary32(),
        BitPattern::from_str("0x4640e666").unwrap(),
    ).unwrap();
    
    assert_eq!(bin.to_f32(), oct.to_f32());
    assert_eq!(bin.to_f32(), dec.to_f32());
    assert_eq!(bin.to_f32(), hex.to_f32());
}

#[test]
fn parse_and_display() {
    assert_eq!(
        format!("{:.15}", Float::from_str(Format::ieee_binary32(), "0.000000000000123456789").unwrap()),
        format!("{:.15}", 0.000000000000123456789f32),
    );

    assert_eq!(
        format!("{}", Float::from_str(Format::ieee_binary32(), "123456789876543212345678987654321234567").unwrap())[..6],
        format!("{}", 123456789876543212345678987654321234567f32)[..6],
    );

    assert_eq!(
        format!("{:.3}", Float::from_str(Format::ieee_binary32(), "12345.6789").unwrap()),
        format!("{:.3}", 12345.6789f32),
    );

    assert_eq!(
        format!("{:.6}", Float::from_str(Format::ieee_binary32(), "0.123456").unwrap()),
        format!("{:.6}", 0.123456f32),
    );

    assert_eq!(
        format!("{}", Float::from_str(Format::ieee_binary32(), "123456").unwrap()),
        format!("{}", 123456f32),
    );
}

#[test]
fn extreme_values() {
    assert_eq!(
        format!("{}", Float::from_str(Format::new(16, 128, 32767), "123456789876543212345678987654321234567898765432123456789876543212345678987654321234567898765432123456789876543212345678987654321234567898765432123456789876543212345678987654321234567898765432123456789876543212345678987654321234567898765432123456789876543212345678987654321234567898765432123456789876543212345678987654321234567898765432123456789876543212345678987654321234567898765432").unwrap())[..20],
        format!("{}", "12345678987654321234"),
    );

    assert_eq!(
        format!("{}", Float::from_str(Format::new(16, 128, 32767), "0.00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001").unwrap()),
        format!("{}", "0.0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000099999999"),
    );
}