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// Type infos and methods for Floats (floating point numbers)
// This file is a template that expects `FLOATX_C_H__BITS` to be defined before including:
//
// #define FLOATX_C_H__BITS 64
// #include "floatX.c.h"
//
#include <float.h>
#include <gc.h>
#include <math.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include "text.h"
#include "types.h"
#ifndef FLOATX_C_H__BITS
#define FLOATX_C_H__BITS 64
#endif
#if FLOATX_C_H__BITS == 64
#define FLOAT_T double
#define OPT_T double
#define NAMESPACED(x) Float64$##x
#define TYPE_STR "Float64"
#define SUFFIXED(x) x
#elif FLOATX_C_H__BITS == 32
#define FLOAT_T float
#define OPT_T float
#define NAMESPACED(x) Float32$##x
#define TYPE_STR "Float32"
#define SUFFIXED(x) x##f
#else
#error "Unsupported bit width for Float"
#endif
#if FLOATX_C_H__BITS == 64
#include "fpconv.h"
#include "string.h"
public
PUREFUNC Text_t NAMESPACED(value_as_text)(FLOAT_T x) {
char *str = GC_MALLOC_ATOMIC(24);
int len = fpconv_dtoa(x, str);
return Text$from_strn(str, (size_t)len);
}
public
PUREFUNC Text_t NAMESPACED(as_text)(const void *x, bool colorize, const TypeInfo_t *info) {
(void)info;
if (!x) return Text(TYPE_STR);
static const Text_t color_prefix = Text("\x1b[35m"), color_suffix = Text("\x1b[m");
Text_t text = NAMESPACED(value_as_text)(*(FLOAT_T *)x);
return colorize ? Texts(color_prefix, text, color_suffix) : text;
}
public
PUREFUNC int32_t NAMESPACED(compare)(const void *x, const void *y, const TypeInfo_t *info) {
(void)info;
int64_t rx = *(int64_t *)x, ry = *(int64_t *)y;
if (rx == ry) return 0;
if (rx < 0) rx ^= INT64_MAX;
if (ry < 0) ry ^= INT64_MAX;
return (rx > ry) - (rx < ry);
}
#elif FLOATX_C_H__BITS == 32
public
PUREFUNC Text_t NAMESPACED(value_as_text)(FLOAT_T x) { return Float64$value_as_text((double)x); }
public
PUREFUNC Text_t NAMESPACED(as_text)(const void *x, bool colorize, const TypeInfo_t *info) {
(void)info;
if (!x) return Text(TYPE_STR);
static const Text_t color_prefix = Text("\x1b[35m"), color_suffix = Text("\x1b[m");
Text_t text = Float64$value_as_text((double)*(FLOAT_T *)x);
return colorize ? Texts(color_prefix, text, color_suffix) : text;
}
public
PUREFUNC int32_t NAMESPACED(compare)(const void *x, const void *y, const TypeInfo_t *info) {
(void)info;
int32_t rx = *(int32_t *)x, ry = *(int32_t *)y;
if (rx == ry) return 0;
if (rx < 0) rx ^= INT32_MAX;
if (ry < 0) ry ^= INT32_MAX;
return (rx > ry) - (rx < ry);
}
#endif
public
PUREFUNC bool NAMESPACED(equal)(const void *x, const void *y, const TypeInfo_t *info) {
(void)info;
return *(FLOAT_T *)x == *(FLOAT_T *)y;
}
public
CONSTFUNC bool NAMESPACED(near)(FLOAT_T a, FLOAT_T b, FLOAT_T ratio, FLOAT_T absolute) {
if (ratio < 0) ratio = 0;
else if (ratio > 1) ratio = 1;
if (a == b) return true;
FLOAT_T diff = SUFFIXED(fabs)(a - b);
if (diff < absolute) return true;
else if (isnan(diff)) return false;
FLOAT_T epsilon = SUFFIXED(fabs)(a * ratio) + SUFFIXED(fabs)(b * ratio);
if (isinf(epsilon)) epsilon = DBL_MAX;
return (diff < epsilon);
}
public
Text_t NAMESPACED(percent)(FLOAT_T x, FLOAT_T precision) {
FLOAT_T d = SUFFIXED(100.) * x;
d = NAMESPACED(with_precision)(d, precision);
return Texts(NAMESPACED(value_as_text)(d), Text("%"));
}
public
CONSTFUNC FLOAT_T NAMESPACED(with_precision)(FLOAT_T n, FLOAT_T precision) {
if (precision == SUFFIXED(0.0)) return n;
// Precision will be, e.g. 0.01 or 100.
if (precision < SUFFIXED(1.)) {
FLOAT_T inv = SUFFIXED(round)(SUFFIXED(1.) / precision); // Necessary to make the math work
FLOAT_T k = n * inv;
return SUFFIXED(round)(k) / inv;
} else {
FLOAT_T k = n / precision;
return SUFFIXED(round)(k) * precision;
}
}
public
CONSTFUNC FLOAT_T NAMESPACED(mod)(FLOAT_T n, FLOAT_T modulus) {
// Euclidean division, see:
// https://www.microsoft.com/en-us/research/wp-content/uploads/2016/02/divmodnote-letter.pdf
FLOAT_T r = (FLOAT_T)remainder((double)n, (double)modulus);
r -= (r < SUFFIXED(0.)) * (SUFFIXED(2.) * (modulus < SUFFIXED(0.)) - SUFFIXED(1.)) * modulus;
return r;
}
public
CONSTFUNC FLOAT_T NAMESPACED(mod1)(FLOAT_T n, FLOAT_T modulus) {
return SUFFIXED(1.0) + NAMESPACED(mod)(n - SUFFIXED(1.0), modulus);
}
public
CONSTFUNC FLOAT_T NAMESPACED(mix)(FLOAT_T amount, FLOAT_T x, FLOAT_T y) {
return (SUFFIXED(1.0) - amount) * x + amount * y;
}
public
CONSTFUNC bool NAMESPACED(is_between)(const FLOAT_T x, const FLOAT_T low, const FLOAT_T high) {
return low <= x && x <= high;
}
public
CONSTFUNC FLOAT_T NAMESPACED(clamped)(FLOAT_T x, FLOAT_T low, FLOAT_T high) {
return (x <= low) ? low : (x >= high ? high : x);
}
public
OPT_T NAMESPACED(parse)(Text_t text, Text_t *remainder) {
const char *str = Text$as_c_string(text);
char *end = NULL;
#if FLOATX_C_H__BITS == 64
FLOAT_T n = strtod(str, &end);
#elif FLOATX_C_H__BITS == 32
FLOAT_T n = strtof(str, &end);
#endif
if (end > str) {
if (remainder) *remainder = Text$from_str(end);
else if (*end != '\0') return SUFFIXED(nan)("none");
return n;
} else {
if (remainder) *remainder = text;
return SUFFIXED(nan)("none");
}
}
public
CONSTFUNC bool NAMESPACED(is_none)(const void *n, const TypeInfo_t *info) {
(void)info;
return isnan(*(FLOAT_T *)n);
}
public
CONSTFUNC bool NAMESPACED(isinf)(FLOAT_T n) { return (fpclassify(n) == FP_INFINITE); }
public
CONSTFUNC bool NAMESPACED(finite)(FLOAT_T n) { return (fpclassify(n) != FP_INFINITE); }
public
CONSTFUNC bool NAMESPACED(isnan)(FLOAT_T n) { return (fpclassify(n) == FP_NAN); }
public
const TypeInfo_t NAMESPACED(info) = {
.size = sizeof(FLOAT_T),
.align = __alignof__(FLOAT_T),
.metamethods =
{
.compare = NAMESPACED(compare),
.equal = NAMESPACED(equal),
.as_text = NAMESPACED(as_text),
.is_none = NAMESPACED(is_none),
},
};
#undef FLOAT_T
#undef OPT_T
#undef NAMESPACED
#undef TYPE_STR
#undef SUFFIXED
#undef FLOATX_C_H__BITS
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