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// Copyright (c) 2019-2021 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 {
unsafe {
f := strconv.Float64u{
f: x
}
if f.u == strconv.double_minus_zero {
return '-0'
}
if f.u == strconv.double_plus_zero {
return '0'
}
}
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)
}
}
// strg return a `f64` as `string` in "g" printf format
[inline]
pub fn (x f64) strg() string {
if x == 0 {
return '0'
}
abs_x := f64_abs(x)
if abs_x >= 0.0001 && abs_x < 1.0e6 {
return strconv.f64_to_str_l_no_dot(x)
} else {
return strconv.ftoa_64(x)
}
}
// str returns the value of the `float_literal` as a `string`.
[inline]
pub fn (d float_literal) str() string {
return f64(d).str()
}
// strsci returns the `f64` as a `string` in scientific notation with `digit_num` decimals displayed, max 17 digits.
// Example: assert f64(1.234).strsci(3) == '1.234e+00'
[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)
}
// strlong returns a decimal notation of the `f64` as a `string`.
// Example: assert f64(1.23456).strlong() == '1.23456'
[inline]
pub fn (x f64) strlong() string {
return strconv.f64_to_str_l(x)
}
/*
-----------------------------------
----- f32 to string functions -----
*/
// str returns a `f32` as `string` in suitable notation.
[inline]
pub fn (x f32) str() string {
unsafe {
f := strconv.Float32u{
f: x
}
if f.u == strconv.single_minus_zero {
return '-0'
}
if f.u == strconv.single_plus_zero {
return '0'
}
}
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)
}
}
// strg return a `f32` as `string` in "g" printf format
[inline]
pub fn (x f32) strg() string {
if x == 0 {
return '0'
}
abs_x := f32_abs(x)
if abs_x >= 0.0001 && abs_x < 1.0e6 {
return strconv.f32_to_str_l_no_dot(x)
} else {
return strconv.ftoa_32(x)
}
}
// strsci returns the `f32` as a `string` in scientific notation with `digit_num` deciamals displayed, max 8 digits.
// Example: assert f32(1.234).strsci(3) == '1.234e+00'
[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)
}
// strlong returns a decimal notation of the `f32` as a `string`.
[inline]
pub fn (x f32) strlong() string {
return strconv.f32_to_str_l(x)
}
/*
-----------------------
----- C functions -----
*/
// f32_abs returns the absolute value of `a` as a `f32` value.
// Example: assert f32_abs(-2.0) == 2.0
[inline]
pub fn f32_abs(a f32) f32 {
return if a < 0 { -a } else { a }
}
// f64_abs returns the absolute value of `a` as a `f64` value.
// Example: assert f64_abs(-2.0) == f64(2.0)
[inline]
fn f64_abs(a f64) f64 {
return if a < 0 { -a } else { a }
}
// f32_max returns the largest `f32` of input `a` and `b`.
// Example: assert f32_max(2.0,3.0) == 3.0
[inline]
pub fn f32_max(a f32, b f32) f32 {
return if a > b { a } else { b }
}
// f32_min returns the smallest `f32` of input `a` and `b`.
// Example: assert f32_min(2.0,3.0) == 2.0
[inline]
pub fn f32_min(a f32, b f32) f32 {
return if a < b { a } else { b }
}
// f64_max returns the largest `f64` of input `a` and `b`.
// Example: assert f64_max(2.0,3.0) == 3.0
[inline]
pub fn f64_max(a f64, b f64) f64 {
return if a > b { a } else { b }
}
// f64_min returns the smallest `f64` of input `a` and `b`.
// Example: assert f64_min(2.0,3.0) == 2.0
[inline]
fn f64_min(a f64, b f64) f64 {
return if a < b { a } else { b }
}
// eq_epsilon returns true if the `f32` is equal to input `b`.
// using an epsilon of typically 1E-5 or higher (backend/compiler dependent).
// Example: assert f32(2.0).eq_epsilon(2.0)
[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
}
}
// eq_epsilon returns true if the `f64` is equal to input `b`.
// using an epsilon of typically 1E-9 or higher (backend/compiler dependent).
// Example: assert f64(2.0).eq_epsilon(2.0)
[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
}
}
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