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use crate::interval::*;
use gmp_mpfr_sys::mpfr;
use rug::Float;
use std::{
ffi::{CStr, CString},
fmt,
os::raw::c_char,
};
fn mpfr_printf(template: &str, f: &Float) -> String {
assert!(!f.is_nan());
if f.is_infinite() {
return if f.is_sign_negative() {
String::from("-inf")
} else {
String::from("inf")
};
}
let mut p: *mut c_char = std::ptr::null_mut();
let c_template = CString::new(template).unwrap();
unsafe {
let len = mpfr::asprintf(&mut p, c_template.as_ptr(), f.as_raw());
assert!(len >= 0);
let c_str = CStr::from_ptr(p);
let s = c_str.to_str().unwrap().to_owned();
mpfr::free_str(p);
s
}
}
fn fmt_impl(x: Interval, d: Option<Decoration>, f: &mut fmt::Formatter, conv: char) -> fmt::Result {
let width = f.width().unwrap_or(0);
let str_width = 2 * width + 1;
if d == Some(Decoration::Ill) {
return write!(f, "[{:^w$}]", "nai", w = str_width);
}
let sd = match d {
Some(Decoration::Com) => "_com",
Some(Decoration::Dac) => "_dac",
Some(Decoration::Def) => "_def",
Some(Decoration::Trv) => "_trv",
_ => "",
};
if x.is_empty() {
write!(f, "[{:^w$}]{}", "empty", sd, w = str_width)
} else if x.is_entire() {
write!(f, "[{:^w$}]{}", "entire", sd, w = str_width)
} else {
let prec = match f.precision() {
Some(p) => format!(".{}", p),
None => String::new(),
};
let fa = Float::with_val(f64::MANTISSA_DIGITS, x.inf());
let fb = Float::with_val(f64::MANTISSA_DIGITS, x.sup());
let sa = mpfr_printf(&format!("%{}RD{}", prec, conv), &fa);
let sb = mpfr_printf(&format!("%{}RU{}", prec, conv), &fb);
write!(f, "[{:>w$},{:>w$}]{}", sa, sb, sd, w = width)
}
}
impl fmt::Display for Interval {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt_impl(*self, None, f, 'f')
}
}
impl fmt::LowerExp for Interval {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt_impl(*self, None, f, 'e')
}
}
impl fmt::LowerHex for Interval {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt_impl(*self, None, f, 'a')
}
}
impl fmt::Display for DecInterval {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt_impl(self.x, Some(self.d), f, 'f')
}
}
impl fmt::LowerExp for DecInterval {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt_impl(self.x, Some(self.d), f, 'e')
}
}
impl fmt::LowerHex for DecInterval {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt_impl(self.x, Some(self.d), f, 'a')
}
}
#[cfg(test)]
mod tests {
use crate::*;
use DecInterval as DI;
use Decoration as D;
use Interval as I;
#[test]
fn format() {
assert_eq!(
format!("{}", const_interval!(f64::NEG_INFINITY, 0.0)),
"[-inf,0.000000]"
);
assert_eq!(
format!("{:e}", const_interval!(f64::NEG_INFINITY, 0.0)),
"[-inf,0.0000000000000000e+00]"
);
assert_eq!(
format!("{:x}", const_interval!(f64::NEG_INFINITY, 0.0)),
"[-inf,0x0p+0]"
);
assert_eq!(
format!("{}", const_interval!(0.0, f64::INFINITY)),
"[-0.000000,inf]"
);
assert_eq!(
format!("{:e}", const_interval!(0.0, f64::INFINITY)),
"[-0.0000000000000000e+00,inf]"
);
assert_eq!(
format!("{:x}", const_interval!(0.0, f64::INFINITY)),
"[-0x0p+0,inf]"
);
assert_eq!(format!("{:.6}", I::PI), "[3.141592,3.141593]");
assert_eq!(format!("{:.6e}", I::PI), "[3.141592e+00,3.141593e+00]");
assert_eq!(format!("{:.6x}", I::PI), "[0x3.243f6ap+0,0x3.243f6bp+0]");
assert_eq!(
format!("{:.6}", DI::set_dec(I::PI, D::Com)),
"[3.141592,3.141593]_com"
);
assert_eq!(
format!("{:.6}", DI::set_dec(I::PI, D::Dac)),
"[3.141592,3.141593]_dac"
);
assert_eq!(
format!("{:.6}", DI::set_dec(I::PI, D::Def)),
"[3.141592,3.141593]_def"
);
assert_eq!(
format!("{:.6}", DI::set_dec(I::PI, D::Trv)),
"[3.141592,3.141593]_trv"
);
assert_eq!(
format!("{:15.6}", I::PI),
"[ 3.141592, 3.141593]"
);
assert_eq!(
format!("{:15.6e}", I::PI),
"[ 3.141592e+00, 3.141593e+00]"
);
assert_eq!(
format!("{:15.6x}", I::PI),
"[ 0x3.243f6ap+0, 0x3.243f6bp+0]"
);
macro_rules! check {
($($f:literal),*) => {$(
assert_eq!(format!($f, I::EMPTY), "[empty]");
assert_eq!(format!($f, I::ENTIRE), "[entire]");
assert_eq!(format!($f, DI::EMPTY), "[empty]_trv");
assert_eq!(format!($f, DI::ENTIRE), "[entire]_dac");
assert_eq!(format!($f, DI::NAI), "[nai]");
)*};
}
check!("{}", "{:e}", "{:x}");
macro_rules! check {
($($f:literal),*) => {$(
assert_eq!(format!($f, I::EMPTY), "[ empty ]");
assert_eq!(format!($f, I::ENTIRE), "[ entire ]");
assert_eq!(format!($f, DI::EMPTY), "[ empty ]_trv");
assert_eq!(format!($f, DI::ENTIRE), "[ entire ]_dac");
assert_eq!(format!($f, DI::NAI), "[ nai ]");
)*};
}
check!("{:5}", "{:5e}", "{:5x}");
}
}