150 lines
2.6 KiB
V
150 lines
2.6 KiB
V
// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
|
|
// Use of this source code is governed by an MIT license that can be found in the LICENSE file.
|
|
module builtin
|
|
|
|
import strconv
|
|
|
|
#include <float.h>
|
|
// ----- f64 to string functions -----
|
|
// str return a f64 as string in suitable notation
|
|
[inline]
|
|
pub fn (x f64) str() string {
|
|
abs_x := f64_abs(x)
|
|
if abs_x >= 0.0001 && abs_x < 1.0e6 {
|
|
return strconv.f64_to_str_l(x)
|
|
} else {
|
|
return strconv.ftoa_64(x)
|
|
}
|
|
}
|
|
|
|
[inline]
|
|
pub fn (d any_float) str() string {
|
|
return f64(d).str()
|
|
}
|
|
|
|
// return a string of the input f64 in scientific notation with digit_num deciamals displayed, max 17 digits
|
|
[inline]
|
|
pub fn (x f64) strsci(digit_num int) string {
|
|
mut n_digit := digit_num
|
|
if n_digit < 1 {
|
|
n_digit = 1
|
|
} else if n_digit > 17 {
|
|
n_digit = 17
|
|
}
|
|
return strconv.f64_to_str(x, n_digit)
|
|
}
|
|
|
|
// return a decimal notation of the input f64
|
|
[inline]
|
|
pub fn (x f64) strlong() string {
|
|
return strconv.f64_to_str_l(x)
|
|
}
|
|
|
|
// ----- f32 to string functions -----
|
|
// str return a f32 as string in suitable notation
|
|
[inline]
|
|
pub fn (x f32) str() string {
|
|
abs_x := f32_abs(x)
|
|
if abs_x >= 0.0001 && abs_x < 1.0e6 {
|
|
return strconv.f32_to_str_l(x)
|
|
} else {
|
|
return strconv.ftoa_32(x)
|
|
}
|
|
}
|
|
|
|
// return a string of the input f32 in scientific notation with digit_num deciamals displayed, max 8 digits
|
|
[inline]
|
|
pub fn (x f32) strsci(digit_num int) string {
|
|
mut n_digit := digit_num
|
|
if n_digit < 1 {
|
|
n_digit = 1
|
|
} else if n_digit > 8 {
|
|
n_digit = 8
|
|
}
|
|
return strconv.f32_to_str(x, n_digit)
|
|
}
|
|
|
|
// return a decimal notation of the input f32
|
|
[inline]
|
|
pub fn (x f32) strlong() string {
|
|
return strconv.f32_to_str_l(x)
|
|
}
|
|
|
|
// ----- C functions -----
|
|
[inline]
|
|
pub fn f32_abs(a f32) f32 {
|
|
return if a < 0 {
|
|
-a
|
|
} else {
|
|
a
|
|
}
|
|
}
|
|
|
|
[inline]
|
|
fn f64_abs(a f64) f64 {
|
|
return if a < 0 {
|
|
-a
|
|
} else {
|
|
a
|
|
}
|
|
}
|
|
|
|
|
|
[inline]
|
|
pub fn f32_max(a f32, b f32) f32 {
|
|
return if a > b {
|
|
a
|
|
} else {
|
|
b
|
|
}
|
|
}
|
|
|
|
[inline]
|
|
pub fn f32_min(a f32, b f32) f32 {
|
|
return if a < b {
|
|
a
|
|
} else {
|
|
b
|
|
}
|
|
}
|
|
|
|
[inline]
|
|
pub fn f64_max(a f64, b f64) f64 {
|
|
return if a > b {
|
|
a
|
|
} else {
|
|
b
|
|
}
|
|
}
|
|
|
|
[inline]
|
|
fn f64_min(a f64, b f64) f64 {
|
|
return if a < b {
|
|
a
|
|
} else {
|
|
b
|
|
}
|
|
}
|
|
|
|
[inline]
|
|
pub fn (a f32) eq_epsilon(b f32) bool {
|
|
hi := f32_max(f32_abs(a), f32_abs(b))
|
|
delta := f32_abs(a - b)
|
|
if hi > f32(1.0) {
|
|
return delta <= hi * (4 * f32(C.FLT_EPSILON))
|
|
} else {
|
|
return (1 / (4 * f32(C.FLT_EPSILON))) * delta <= hi
|
|
}
|
|
}
|
|
|
|
[inline]
|
|
pub fn (a f64) eq_epsilon(b f64) bool {
|
|
hi := f64_max(f64_abs(a), f64_abs(b))
|
|
delta := f64_abs(a - b)
|
|
if hi > 1.0 {
|
|
return delta <= hi * (4 * f64(C.DBL_EPSILON))
|
|
} else {
|
|
return (1 / (4 * f64(C.DBL_EPSILON))) * delta <= hi
|
|
}
|
|
}
|