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e8ad94da9338e1d0ed6acf709f611e6830b16621
mruby-mruby/src/numeric.c
T
Masaki Muranaka 21f2e5364b Use mrb_str_new() instead of mrb_str_new2() as possible.
2012-06-22 17:02:08 +09:00

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/*
** numeric.c - Numeric, Integer, Float, Fixnum class
**
** See Copyright Notice in mruby.h
*/
#include "mruby.h"
#include "mruby/numeric.h"
#include "mruby/string.h"
#include "mruby/array.h"
#include <string.h>
#include "mruby/class.h"
#include "mruby/variable.h"
#include <ctype.h>
#include <math.h>
#include <stdio.h>
#include <assert.h>
#if defined(__FreeBSD__) && __FreeBSD__ < 4
#include <floatingpoint.h>
#endif
#ifdef HAVE_FLOAT_H
#include <float.h>
#endif
#ifdef HAVE_IEEEFP_H
#include <ieeefp.h>
#endif
#define RSHIFT(x,y) ((x)>>(int)(y))
#ifdef MRB_USE_FLOAT
#define floor(f) floorf(f)
#define ceil(f) ceilf(f)
#define floor(f) floorf(f)
#define fmod(x,y) fmodf(x,y)
#endif
static mrb_float
mrb_to_flo(mrb_state *mrb, mrb_value val)
{
switch (mrb_type(val)) {
case MRB_TT_FIXNUM:
return (mrb_float)mrb_fixnum(val);
case MRB_TT_FLOAT:
break;
default:
mrb_raise(mrb, E_TYPE_ERROR, "non float value");
}
return mrb_float(val);
}
/*
* call-seq:
* +num -> num
*
* Unary Plus---Returns the receiver's value.
*/
static mrb_value
num_uplus(mrb_state *mrb, mrb_value num)
{
return num;
}
/*
* call-seq:
* -num -> numeric
*
* Unary Minus---Returns the receiver's value, negated.
*/
static mrb_value
num_uminus(mrb_state *mrb, mrb_value num)
{
return mrb_float_value((mrb_float)0 - mrb_to_flo(mrb, num));
}
static mrb_value
fix_uminus(mrb_state *mrb, mrb_value num)
{
return mrb_fixnum_value(0 - mrb_fixnum(num));
}
/*
* call-seq:
*
* num ** other -> num
*
* Raises <code>num</code> the <code>other</code> power.
*
* 2.0**3 #=> 8.0
*/
static mrb_value
num_pow(mrb_state *mrb, mrb_value x)
{
mrb_value y;
int both_int = FALSE;
mrb_float d;
mrb_get_args(mrb, "o", &y);
if (FIXNUM_P(x) && FIXNUM_P(y)) both_int = TRUE;
d = pow(mrb_to_flo(mrb, x), mrb_to_flo(mrb, y));
if (both_int && FIXABLE(d))
return mrb_fixnum_value((mrb_int)d);
return mrb_float_value(d);
}
/* 15.2.8.3.4 */
/* 15.2.9.3.4 */
/*
* call-seq:
* num / other -> num
*
* Performs division: the class of the resulting object depends on
* the class of <code>num</code> and on the magnitude of the
* result.
*/
mrb_value
mrb_num_div(mrb_state *mrb, mrb_value x, mrb_value y)
{
return mrb_float_value(mrb_to_flo(mrb, x) / mrb_to_flo(mrb, y));
}
/* 15.2.9.3.19(x) */
/*
* call-seq:
* num.quo(numeric) -> real
*
* Returns most exact division.
*/
static mrb_value
num_div(mrb_state *mrb, mrb_value x)
{
mrb_float y;
mrb_get_args(mrb, "f", &y);
return mrb_float_value(mrb_to_flo(mrb, x) / y);
}
/*
* call-seq:
* num.abs -> numeric
* num.magnitude -> numeric
*
* Returns the absolute value of <i>num</i>.
*
* 12.abs #=> 12
* (-34.56).abs #=> 34.56
* -34.56.abs #=> 34.56
*/
static mrb_value
num_abs(mrb_state *mrb, mrb_value num)
{
if (mrb_to_flo(mrb, num) < 0) {
return num_uminus(mrb, num);
}
return num;
}
/********************************************************************
*
* Document-class: Float
*
* <code>Float</code> objects represent inexact real numbers using
* the native architecture's double-precision floating point
* representation.
*/
/* 15.2.9.3.16(x) */
/*
* call-seq:
* flt.to_s -> string
*
* Returns a string containing a representation of self. As well as a
* fixed or exponential form of the number, the call may return
* ``<code>NaN</code>'', ``<code>Infinity</code>'', and
* ``<code>-Infinity</code>''.
*/
static mrb_value
flo_to_s(mrb_state *mrb, mrb_value flt)
{
char buf[32];
int n;
mrb_float value = mrb_float(flt);
if (isinf(value)) {
static const char s[2][5] = { "-inf", "inf" };
static const int n[] = { 4, 3 };
int idx;
idx = (value < 0) ? 0 : 1;
return mrb_str_new(mrb, s[idx], n[idx]);
} else if(isnan(value))
return mrb_str_new(mrb, "NaN", 3);
n = sprintf(buf, "%.14g", value);
assert(n >= 0);
return mrb_str_new(mrb, buf, n);
}
/* 15.2.9.3.2 */
/*
* call-seq:
* float - other -> float
*
* Returns a new float which is the difference of <code>float</code>
* and <code>other</code>.
*/
static mrb_value
flo_minus(mrb_state *mrb, mrb_value x)
{
mrb_value y;
mrb_get_args(mrb, "o", &y);
return mrb_float_value(mrb_float(x) - mrb_to_flo(mrb, y));
}
/* 15.2.9.3.3 */
/*
* call-seq:
* float * other -> float
*
* Returns a new float which is the product of <code>float</code>
* and <code>other</code>.
*/
static mrb_value
flo_mul(mrb_state *mrb, mrb_value x)
{
mrb_value y;
mrb_get_args(mrb, "o", &y);
return mrb_float_value(mrb_float(x) * mrb_to_flo(mrb, y));
}
static void
flodivmod(mrb_state *mrb, mrb_float x, mrb_float y, mrb_float *divp, mrb_float *modp)
{
mrb_float div, mod;
mod = fmod(x, y);
if (isinf(x) && !isinf(y) && !isnan(y))
div = x;
else
div = (x - mod) / y;
if (y*mod < 0) {
mod += y;
div -= 1.0;
}
if (modp) *modp = mod;
if (divp) *divp = div;
}
/* 15.2.9.3.5 */
/*
* call-seq:
* flt % other -> float
* flt.modulo(other) -> float
*
* Return the modulo after division of <code>flt</code> by <code>other</code>.
*
* 6543.21.modulo(137) #=> 104.21
* 6543.21.modulo(137.24) #=> 92.9299999999996
*/
static mrb_value
flo_mod(mrb_state *mrb, mrb_value x)
{
mrb_value y;
mrb_float fy, mod;
mrb_get_args(mrb, "o", &y);
fy = mrb_to_flo(mrb, y);
flodivmod(mrb, mrb_float(x), fy, 0, &mod);
return mrb_float_value(mod);
}
/* 15.2.8.3.16 */
/*
* call-seq:
* num.eql?(numeric) -> true or false
*
* Returns <code>true</code> if <i>num</i> and <i>numeric</i> are the
* same type and have equal values.
*
* 1 == 1.0 #=> true
* 1.eql?(1.0) #=> false
* (1.0).eql?(1.0) #=> true
*/
static mrb_value
num_eql(mrb_state *mrb, mrb_value x)
{
mrb_value y;
mrb_get_args(mrb, "o", &y);
if (mrb_type(x) != mrb_type(y)) return mrb_false_value();
if (mrb_equal(mrb, x, y)) {
return mrb_true_value();
}
else {
return mrb_false_value();
}
}
static mrb_value
num_equal(mrb_state *mrb, mrb_value x, mrb_value y)
{
if (mrb_obj_equal(mrb, x, y)) return mrb_true_value();
return mrb_funcall(mrb, y, "==", 1, x);
}
/* 15.2.9.3.7 */
/*
* call-seq:
* flt == obj -> true or false
*
* Returns <code>true</code> only if <i>obj</i> has the same value
* as <i>flt</i>. Contrast this with <code>Float#eql?</code>, which
* requires <i>obj</i> to be a <code>Float</code>.
*
* 1.0 == 1 #=> true
*
*/
static mrb_value
flo_eq(mrb_state *mrb, mrb_value x)
{
mrb_value y;
volatile mrb_float a, b;
mrb_get_args(mrb, "o", &y);
switch (mrb_type(y)) {
case MRB_TT_FIXNUM:
b = (mrb_float)mrb_fixnum(y);
break;
case MRB_TT_FLOAT:
b = mrb_float(y);
break;
default:
return num_equal(mrb, x, y);
}
a = mrb_float(x);
return (a == b)?mrb_true_value():mrb_false_value();
}
/* 15.2.8.3.18 */
/*
* call-seq:
* flt.hash -> integer
*
* Returns a hash code for this float.
*/
static mrb_value
flo_hash(mrb_state *mrb, mrb_value num)
{
mrb_float d;
char *c;
int i, hash;
d = (mrb_float)mrb_fixnum(num);
/* normalize -0.0 to 0.0 */
if (d == 0) d = 0.0;
c = (char*)&d;
for (hash=0, i=0; i<sizeof(mrb_float);i++) {
hash = (hash * 971) ^ (unsigned char)c[i];
}
if (hash < 0) hash = -hash;
return mrb_fixnum_value(hash);
}
/* 15.2.9.3.13 */
/*
* call-seq:
* flt.to_f -> self
*
* As <code>flt</code> is already a float, returns +self+.
*/
static mrb_value
flo_to_f(mrb_state *mrb, mrb_value num)
{
return num;
}
/* 15.2.9.3.11 */
/*
* call-seq:
* flt.infinite? -> nil, -1, +1
*
* Returns <code>nil</code>, -1, or +1 depending on whether <i>flt</i>
* is finite, -infinity, or +infinity.
*
* (0.0).infinite? #=> nil
* (-1.0/0.0).infinite? #=> -1
* (+1.0/0.0).infinite? #=> 1
*/
static mrb_value
flo_infinite_p(mrb_state *mrb, mrb_value num)
{
mrb_float value = mrb_float(num);
if (isinf(value)) {
return mrb_fixnum_value( value < 0 ? -1 : 1 );
}
return mrb_nil_value();
}
/* 15.2.9.3.9 */
/*
* call-seq:
* flt.finite? -> true or false
*
* Returns <code>true</code> if <i>flt</i> is a valid IEEE floating
* point number (it is not infinite, and <code>nan?</code> is
* <code>false</code>).
*
*/
static mrb_value
flo_finite_p(mrb_state *mrb, mrb_value num)
{
mrb_float value = mrb_float(num);
if (isinf(value) || isnan(value))
return mrb_false_value();
return mrb_true_value();
}
/* 15.2.9.3.10 */
/*
* call-seq:
* flt.floor -> integer
*
* Returns the largest integer less than or equal to <i>flt</i>.
*
* 1.2.floor #=> 1
* 2.0.floor #=> 2
* (-1.2).floor #=> -2
* (-2.0).floor #=> -2
*/
static mrb_value
flo_floor(mrb_state *mrb, mrb_value num)
{
mrb_float f = floor(mrb_float(num));
if (!FIXABLE(f)) {
return mrb_float_value(f);
}
return mrb_fixnum_value((mrb_int)f);
}
/* 15.2.9.3.8 */
/*
* call-seq:
* flt.ceil -> integer
*
* Returns the smallest <code>Integer</code> greater than or equal to
* <i>flt</i>.
*
* 1.2.ceil #=> 2
* 2.0.ceil #=> 2
* (-1.2).ceil #=> -1
* (-2.0).ceil #=> -2
*/
static mrb_value
flo_ceil(mrb_state *mrb, mrb_value num)
{
mrb_float f = ceil(mrb_float(num));
if (!FIXABLE(f)) {
return mrb_float_value(f);
}
return mrb_fixnum_value((mrb_int)f);
}
/* 15.2.9.3.12 */
/*
* call-seq:
* flt.round([ndigits]) -> integer or float
*
* Rounds <i>flt</i> to a given precision in decimal digits (default 0 digits).
* Precision may be negative. Returns a floating point number when ndigits
* is more than zero.
*
* 1.4.round #=> 1
* 1.5.round #=> 2
* 1.6.round #=> 2
* (-1.5).round #=> -2
*
* 1.234567.round(2) #=> 1.23
* 1.234567.round(3) #=> 1.235
* 1.234567.round(4) #=> 1.2346
* 1.234567.round(5) #=> 1.23457
*
* 34567.89.round(-5) #=> 0
* 34567.89.round(-4) #=> 30000
* 34567.89.round(-3) #=> 35000
* 34567.89.round(-2) #=> 34600
* 34567.89.round(-1) #=> 34570
* 34567.89.round(0) #=> 34568
* 34567.89.round(1) #=> 34567.9
* 34567.89.round(2) #=> 34567.89
* 34567.89.round(3) #=> 34567.89
*
*/
static mrb_value
flo_round(mrb_state *mrb, /*int argc, mrb_value *argv,*/ mrb_value num)
{
mrb_value nd;
mrb_float number, f;
int ndigits = 0, i;
mrb_value *argv;
int argc;
mrb_get_args(mrb, "*", &argv, &argc);
if (argc == 1) {
nd = argv[0];
ndigits = mrb_fixnum(nd);
}
number = mrb_float(num);
f = 1.0;
i = abs(ndigits);
while (--i >= 0)
f = f*10.0;
if (isinf(f)) {
if (ndigits < 0) number = 0;
}
else {
mrb_float d;
if (ndigits < 0) number /= f;
else number *= f;
/* home-made inline implementation of round(3) */
if (number > 0.0) {
d = floor(number);
number = d + (number - d >= 0.5);
}
else if (number < 0.0) {
d = ceil(number);
number = d - (d - number >= 0.5);
}
if (ndigits < 0) number *= f;
else number /= f;
}
if (ndigits > 0) return mrb_float_value(number);
return mrb_fixnum_value((mrb_int)number);
}
/* 15.2.9.3.14 */
/* 15.2.9.3.15 */
/*
* call-seq:
* flt.to_i -> integer
* flt.to_int -> integer
* flt.truncate -> integer
*
* Returns <i>flt</i> truncated to an <code>Integer</code>.
*/
static mrb_value
flo_truncate(mrb_state *mrb, mrb_value num)
{
mrb_float f = mrb_float(num);
if (f > 0.0) f = floor(f);
if (f < 0.0) f = ceil(f);
if (!FIXABLE(f)) {
return mrb_float_value(f);
}
return mrb_fixnum_value((mrb_int)f);
}
/* 15.2.8.3.17 */
/*
* call-seq:
* num.floor -> integer
*
* Returns the largest integer less than or equal to <i>num</i>.
* <code>Numeric</code> implements this by converting <i>anInteger</i>
* to a <code>Float</code> and invoking <code>Float#floor</code>.
*
* 1.floor #=> 1
* (-1).floor #=> -1
*/
static mrb_value
num_floor(mrb_state *mrb, mrb_value num)
{
return flo_floor(mrb, mrb_Float(mrb, num));
}
/* 15.2.8.3.20 */
/*
* call-seq:
* num.round([ndigits]) -> integer or float
*
* Rounds <i>num</i> to a given precision in decimal digits (default 0 digits).
* Precision may be negative. Returns a floating point number when ndigits
* is more than zero. <code>Numeric</code> implements this by converting itself
* to a <code>Float</code> and invoking <code>Float#round</code>.
*/
static mrb_value
num_round(mrb_state *mrb, mrb_value num)
{
return flo_round(mrb, mrb_Float(mrb, num));
}
/*
* Document-class: Integer
*
* <code>Integer</code> is the basis for the two concrete classes that
* hold whole numbers, <code>Bignum</code> and <code>Fixnum</code>.
*
*/
/* 15.2.8.3.14 */
/* 15.2.8.3.24 */
/* 15.2.8.3.26 */
/*
* call-seq:
* int.to_i -> integer
* int.to_int -> integer
* int.floor -> integer
* int.ceil -> integer
* int.round -> integer
* int.truncate -> integer
*
* As <i>int</i> is already an <code>Integer</code>, all these
* methods simply return the receiver.
*/
static mrb_value
int_to_i(mrb_state *mrb, mrb_value num)
{
return num;
}
/* 15.2.8.3.21 */
/*
* call-seq:
* fixnum.next -> integer
* fixnum.succ -> integer
*
* Returns the <code>Integer</code> equal to <i>int</i> + 1.
*
* 1.next #=> 2
* (-1).next #=> 0
*/
static mrb_value
fix_succ(mrb_state *mrb, mrb_value num)
{
return mrb_fixnum_value(mrb_fixnum(num)+1);
}
/* 15.2.8.3.19 */
/*
* call-seq:
* int.next -> integer
* int.succ -> integer
*
* Returns the <code>Integer</code> equal to <i>int</i> + 1.
*
* 1.next #=> 2
* (-1).next #=> 0
*/
static mrb_value
int_succ(mrb_state *mrb, mrb_value num)
{
if (FIXNUM_P(num)) return fix_succ(mrb, num);
return mrb_funcall(mrb, num, "+", 1, mrb_fixnum_value(1));
}
#define SQRT_INT_MAX ((mrb_int)1<<((sizeof(mrb_int)*CHAR_BIT-1)/2))
/*tests if N*N would overflow*/
#define FIT_SQRT_INT(n) (((n)<SQRT_INT_MAX)&&((n)>=-SQRT_INT_MAX))
mrb_value
mrb_fixnum_mul(mrb_state *mrb, mrb_value x, mrb_value y)
{
mrb_int a;
a = mrb_fixnum(x);
if (a == 0) return x;
if (FIXNUM_P(y)) {
mrb_int b, c;
b = mrb_fixnum(y);
if (FIT_SQRT_INT(a) && FIT_SQRT_INT(b))
return mrb_fixnum_value(a*b);
c = a * b;
if (c/a != b) {
return mrb_float_value((mrb_float)a*(mrb_float)b);
}
return mrb_fixnum_value(c);;
}
return mrb_float_value((mrb_float)a * mrb_to_flo(mrb, y));
}
/* 15.2.8.3.3 */
/*
* call-seq:
* fix * numeric -> numeric_result
*
* Performs multiplication: the class of the resulting object depends on
* the class of <code>numeric</code> and on the magnitude of the
* result.
*/
static mrb_value
fix_mul(mrb_state *mrb, mrb_value x)
{
mrb_value y;
mrb_get_args(mrb, "o", &y);
return mrb_fixnum_mul(mrb, x, y);
}
static void
fixdivmod(mrb_state *mrb, mrb_int x, mrb_int y, mrb_int *divp, mrb_int *modp)
{
mrb_int div, mod;
if (y < 0) {
if (x < 0)
div = -x / -y;
else
div = - (x / -y);
}
else {
if (x < 0)
div = - (-x / y);
else
div = x / y;
}
mod = x - div*y;
if ((mod < 0 && y > 0) || (mod > 0 && y < 0)) {
mod += y;
div -= 1;
}
if (divp) *divp = div;
if (modp) *modp = mod;
}
/* 15.2.8.3.5 */
/*
* call-seq:
* fix % other -> real
* fix.modulo(other) -> real
*
* Returns <code>fix</code> modulo <code>other</code>.
* See <code>numeric.divmod</code> for more information.
*/
static mrb_value
fix_mod(mrb_state *mrb, mrb_value x)
{
mrb_value y;
mrb_int a, b;
mrb_get_args(mrb, "o", &y);
a = mrb_fixnum(x);
if (FIXNUM_P(y) && (b=mrb_fixnum(y)) != 0) {
mrb_int mod;
fixdivmod(mrb, a, mrb_fixnum(y), 0, &mod);
return mrb_fixnum_value(mod);
}
else {
mrb_float mod;
flodivmod(mrb, (mrb_float)a, mrb_to_flo(mrb, y), 0, &mod);
return mrb_float_value(mod);
}
}
/*
* call-seq:
* fix.divmod(numeric) -> array
*
* See <code>Numeric#divmod</code>.
*/
static mrb_value
fix_divmod(mrb_state *mrb, mrb_value x)
{
mrb_value y;
mrb_get_args(mrb, "o", &y);
if (FIXNUM_P(y)) {
mrb_int div, mod;
fixdivmod(mrb, mrb_fixnum(x), mrb_fixnum(y), &div, &mod);
return mrb_assoc_new(mrb, mrb_fixnum_value(div), mrb_fixnum_value(mod));
}
else {
mrb_float div, mod;
mrb_value a, b;
flodivmod(mrb, (mrb_float)mrb_fixnum(x), mrb_to_flo(mrb, y), &div, &mod);
a = mrb_float_value((mrb_int)div);
b = mrb_float_value(mod);
return mrb_assoc_new(mrb, a, b);
}
}
/* 15.2.8.3.7 */
/*
* call-seq:
* fix == other -> true or false
*
* Return <code>true</code> if <code>fix</code> equals <code>other</code>
* numerically.
*
* 1 == 2 #=> false
* 1 == 1.0 #=> true
*/
static mrb_value
fix_equal(mrb_state *mrb, mrb_value x)
{
mrb_value y;
mrb_get_args(mrb, "o", &y);
if (mrb_obj_equal(mrb, x, y)) return mrb_true_value();
switch (mrb_type(y)) {
case MRB_TT_FLOAT:
if ((mrb_float)mrb_fixnum(x) == mrb_float(y))
return mrb_true_value();
/* fall through */
case MRB_TT_FIXNUM:
default:
return mrb_false_value();
}
}
/* 15.2.8.3.8 */
/*
* call-seq:
* ~fix -> integer
*
* One's complement: returns a number where each bit is flipped.
* ex.0---00001 (1)-> 1---11110 (-2)
* ex.0---00010 (2)-> 1---11101 (-3)
* ex.0---00100 (4)-> 1---11011 (-5)
*/
static mrb_value
fix_rev(mrb_state *mrb, mrb_value num)
{
mrb_int val = mrb_fixnum(num);
val = ~val;
return mrb_fixnum_value(val);
}
static mrb_value
bit_coerce(mrb_state *mrb, mrb_value x)
{
while (!FIXNUM_P(x)) {
if (mrb_type(x) == MRB_TT_FLOAT) {
mrb_raise(mrb, E_TYPE_ERROR, "can't convert Float into Integer");
}
x = mrb_to_int(mrb, x);
}
return x;
}
/* 15.2.8.3.9 */
/*
* call-seq:
* fix & integer -> integer_result
*
* Bitwise AND.
*/
static mrb_value
fix_and(mrb_state *mrb, mrb_value x)
{
mrb_value y;
mrb_int val;
mrb_get_args(mrb, "o", &y);
y = bit_coerce(mrb, y);
val = mrb_fixnum(x) & mrb_fixnum(y);
return mrb_fixnum_value(val);
}
/* 15.2.8.3.10 */
/*
* call-seq:
* fix | integer -> integer_result
*
* Bitwise OR.
*/
static mrb_value
fix_or(mrb_state *mrb, mrb_value x)
{
mrb_value y;
mrb_int val;
mrb_get_args(mrb, "o", &y);
y = bit_coerce(mrb, y);
val = mrb_fixnum(x) | mrb_fixnum(y);
return mrb_fixnum_value(val);
}
/* 15.2.8.3.11 */
/*
* call-seq:
* fix ^ integer -> integer_result
*
* Bitwise EXCLUSIVE OR.
*/
static mrb_value
fix_xor(mrb_state *mrb, mrb_value x)
{
mrb_value y;
mrb_int val;
mrb_get_args(mrb, "o", &y);
y = bit_coerce(mrb, y);
val = mrb_fixnum(x) ^ mrb_fixnum(y);
return mrb_fixnum_value(val);
}
static mrb_value
lshift(mrb_state *mrb, mrb_int val, unsigned long width)
{
if (width > (sizeof(mrb_int)*CHAR_BIT-1)
|| ((unsigned long)abs(val))>>(sizeof(mrb_int)*CHAR_BIT-1-width) > 0) {
mrb_raise(mrb, E_RANGE_ERROR, "width(%d) > (%d:sizeof(mrb_int)*CHAR_BIT-1)", width,
sizeof(mrb_int)*CHAR_BIT-1);
}
val = val << width;
return mrb_fixnum_value(val);
}
static mrb_value
rshift(mrb_int val, unsigned long i)
{
if (i >= sizeof(mrb_int)*CHAR_BIT-1) {
if (val < 0) return mrb_fixnum_value(-1);
return mrb_fixnum_value(0);
}
val = RSHIFT(val, i);
return mrb_fixnum_value(val);
}
/* 15.2.8.3.12 */
/*
* call-seq:
* fix << count -> integer
*
* Shifts _fix_ left _count_ positions (right if _count_ is negative).
*/
static mrb_value
fix_lshift(mrb_state *mrb, mrb_value x)
{
mrb_value y;
mrb_int val, width;
mrb_get_args(mrb, "o", &y);
val = mrb_fixnum(x);
y = bit_coerce(mrb, y);
width = mrb_fixnum(y);
if (width < 0)
return rshift(val, (unsigned long)-width);
return lshift(mrb, val, width);
}
/* 15.2.8.3.13 */
/*
* call-seq:
* fix >> count -> integer
*
* Shifts _fix_ right _count_ positions (left if _count_ is negative).
*/
static mrb_value
fix_rshift(mrb_state *mrb, mrb_value x)
{
mrb_value y;
mrb_int i, val;
mrb_get_args(mrb, "o", &y);
val = mrb_fixnum(x);
y = bit_coerce(mrb, y);
i = mrb_fixnum(y);
if (i == 0) return x;
if (i < 0)
return lshift(mrb, val, (unsigned long)-i);
return rshift(val, i);
}
/* 15.2.8.3.23 */
/*
* call-seq:
* fix.to_f -> float
*
* Converts <i>fix</i> to a <code>Float</code>.
*
*/
static mrb_value
fix_to_f(mrb_state *mrb, mrb_value num)
{
mrb_float val;
val = (mrb_float)mrb_fixnum(num);
return mrb_float_value(val);
}
/*
* Document-class: FloatDomainError
*
* Raised when attempting to convert special float values
* (in particular infinite or NaN)
* to numerical classes which don't support them.
*
* Float::INFINITY.to_r
*
* <em>raises the exception:</em>
*
* FloatDomainError: Infinity
*/
/* ------------------------------------------------------------------------*/
static mrb_int
flt2big(mrb_state *mrb, mrb_float d)
{
mrb_int z;
if (isinf(d)) {
mrb_raise(mrb, E_FLOATDOMAIN_ERROR, d < 0 ? "-Infinity" : "Infinity");
}
if (isnan(d)) {
mrb_raise(mrb, E_FLOATDOMAIN_ERROR, "NaN");
}
z = (mrb_int)d;
return z;
}
mrb_value
mrb_flt2big(mrb_state *mrb, mrb_float d)
{
return mrb_fixnum_value(flt2big(mrb, d));
}
mrb_value
mrb_fixnum_plus(mrb_state *mrb, mrb_value x, mrb_value y)
{
mrb_int a;
a = mrb_fixnum(x);
if (a == 0) return y;
if (FIXNUM_P(y)) {
mrb_int b, c;
b = mrb_fixnum(y);
c = a + b;
if (((a < 0) ^ (b < 0)) == 0 && (a < 0) != (c < 0)) {
/* integer overflow */
return mrb_float_value((mrb_float)a + (mrb_float)b);
}
return mrb_fixnum_value(c);
}
return mrb_float_value((mrb_float)a + mrb_to_flo(mrb, y));
}
/* 15.2.8.3.1 */
/*
* call-seq:
* fix + numeric -> numeric_result
*
* Performs addition: the class of the resulting object depends on
* the class of <code>numeric</code> and on the magnitude of the
* result.
*/
static mrb_value
fix_plus(mrb_state *mrb, mrb_value self)
{
mrb_value other;
mrb_get_args(mrb, "o", &other);
return mrb_fixnum_plus(mrb, self, other);
}
mrb_value
mrb_fixnum_minus(mrb_state *mrb, mrb_value x, mrb_value y)
{
mrb_int a;
a = mrb_fixnum(x);
if (FIXNUM_P(y)) {
mrb_int b, c;
b = mrb_fixnum(y);
c = a - b;
if (((a < 0) ^ (b < 0)) != 0 && (a < 0) != (c < 0)) {
/* integer overflow */
return mrb_float_value((mrb_float)a - (mrb_float)b);
}
return mrb_fixnum_value(c);
}
return mrb_float_value((mrb_float)a - mrb_to_flo(mrb, y));
}
/* 15.2.8.3.2 */
/* 15.2.8.3.16 */
/*
* call-seq:
* fix - numeric -> numeric_result
*
* Performs subtraction: the class of the resulting object depends on
* the class of <code>numeric</code> and on the magnitude of the
* result.
*/
static mrb_value
fix_minus(mrb_state *mrb, mrb_value self)
{
mrb_value other;
mrb_get_args(mrb, "o", &other);
return mrb_fixnum_minus(mrb, self, other);
}
/* 15.2.8.3.29 (x) */
/*
* call-seq:
* fix > other => true or false
*
* Returns <code>true</code> if the value of <code>fix</code> is
* greater than that of <code>other</code>.
*/
mrb_value
mrb_fix2str(mrb_state *mrb, mrb_value x, int base)
{
char buf[64], *b = buf + sizeof buf;
mrb_int val = mrb_fixnum(x);
int neg = 0;
if (base < 2 || 36 < base) {
mrb_raise(mrb, E_ARGUMENT_ERROR, "invalid radix %d", base);
}
if (val == 0) {
return mrb_str_new(mrb, "0", 1);
}
if (val < 0) {
val = -val;
neg = 1;
}
*--b = '\0';
if (neg && val < 0) {
do {
*--b = mrb_digitmap[abs(val % base)];
} while (val /= base);
}
else {
do {
*--b = mrb_digitmap[(int)(val % base)];
} while (val /= base);
}
if (neg) {
*--b = '-';
}
return mrb_str_new2(mrb, b);
}
/* 15.2.8.3.25 */
/*
* call-seq:
* fix.to_s(base=10) -> string
*
* Returns a string containing the representation of <i>fix</i> radix
* <i>base</i> (between 2 and 36).
*
* 12345.to_s #=> "12345"
* 12345.to_s(2) #=> "11000000111001"
* 12345.to_s(8) #=> "30071"
* 12345.to_s(10) #=> "12345"
* 12345.to_s(16) #=> "3039"
* 12345.to_s(36) #=> "9ix"
*
*/
static mrb_value
fix_to_s(mrb_state *mrb, mrb_value self)
{
mrb_int base = 10;
mrb_get_args(mrb, "|i", &base);
return mrb_fix2str(mrb, self, base);
}
/* 15.2.9.3.6 */
/*
* call-seq:
* self.f <=> other.f => -1, 0, +1
* < => -1
* = => 0
* > => +1
* Comparison---Returns -1, 0, or +1 depending on whether <i>fix</i> is
* less than, equal to, or greater than <i>numeric</i>. This is the
* basis for the tests in <code>Comparable</code>.
*/
static mrb_value
num_cmp(mrb_state *mrb, mrb_value self)
{
mrb_value other;
mrb_float x, y;
mrb_get_args(mrb, "o", &other);
x = mrb_to_flo(mrb, self);
switch (mrb_type(other)) {
case MRB_TT_FIXNUM:
y = (mrb_float)mrb_fixnum(other);
break;
case MRB_TT_FLOAT:
y = mrb_float(other);
break;
default:
return mrb_nil_value();
}
if (x > y)
return mrb_fixnum_value(1);
else {
if (x < y)
return mrb_fixnum_value(-1);
return mrb_fixnum_value(0);
}
}
/* 15.2.9.3.1 */
/*
* call-seq:
* float + other -> float
*
* Returns a new float which is the sum of <code>float</code>
* and <code>other</code>.
*/
static mrb_value
flo_plus(mrb_state *mrb, mrb_value self)
{
mrb_float x, y;
x = mrb_float(self);
mrb_get_args(mrb, "f", &y);
return mrb_float_value(x + y);
}
/* ------------------------------------------------------------------------*/
void
mrb_init_numeric(mrb_state *mrb)
{
struct RClass *numeric, *integer, *fixnum, *fl;
/* Numeric Class */
numeric = mrb_define_class(mrb, "Numeric", mrb->object_class);
mrb_include_module(mrb, numeric, mrb_class_get(mrb, "Comparable"));
mrb_define_method(mrb, numeric, "+@", num_uplus, ARGS_REQ(1)); /* 15.2.7.4.1 */
mrb_define_method(mrb, numeric, "-@", num_uminus, ARGS_REQ(1)); /* 15.2.7.4.2 */
mrb_define_method(mrb, numeric, "**", num_pow, ARGS_REQ(1));
mrb_define_method(mrb, numeric, "/", num_div, ARGS_REQ(1)); /* 15.2.8.3.4 */
mrb_define_method(mrb, numeric, "quo", num_div, ARGS_REQ(1)); /* 15.2.7.4.5 (x) */
mrb_define_method(mrb, numeric, "abs", num_abs, ARGS_NONE()); /* 15.2.7.4.3 */
mrb_define_method(mrb, numeric, "<=>", num_cmp, ARGS_REQ(1)); /* 15.2.9.3.6 */
/* Integer Class */
integer = mrb_define_class(mrb, "Integer", numeric);
fixnum = mrb->fixnum_class = mrb_define_class(mrb, "Fixnum", integer);
mrb_undef_method(mrb, fixnum, "new");
mrb_define_method(mrb, fixnum, "+", fix_plus, ARGS_REQ(1)); /* 15.2.8.3.1 */
mrb_define_method(mrb, fixnum, "-", fix_minus, ARGS_REQ(1)); /* 15.2.8.3.2 */
mrb_define_method(mrb, fixnum, "-@", fix_uminus, ARGS_REQ(1)); /* 15.2.7.4.2 */
mrb_define_method(mrb, fixnum, "*", fix_mul, ARGS_REQ(1)); /* 15.2.8.3.3 */
mrb_define_method(mrb, fixnum, "%", fix_mod, ARGS_REQ(1)); /* 15.2.8.3.5 */
mrb_define_method(mrb, fixnum, "==", fix_equal, ARGS_REQ(1)); /* 15.2.8.3.7 */
mrb_define_method(mrb, fixnum, "~", fix_rev, ARGS_NONE()); /* 15.2.8.3.8 */
mrb_define_method(mrb, fixnum, "&", fix_and, ARGS_REQ(1)); /* 15.2.8.3.9 */
mrb_define_method(mrb, fixnum, "|", fix_or, ARGS_REQ(1)); /* 15.2.8.3.10 */
mrb_define_method(mrb, fixnum, "^", fix_xor, ARGS_REQ(1)); /* 15.2.8.3.11 */
mrb_define_method(mrb, fixnum, "<<", fix_lshift, ARGS_REQ(1)); /* 15.2.8.3.12 */
mrb_define_method(mrb, fixnum, ">>", fix_rshift, ARGS_REQ(1)); /* 15.2.8.3.13 */
mrb_define_method(mrb, fixnum, "ceil", int_to_i, ARGS_NONE()); /* 15.2.8.3.14 */
mrb_define_method(mrb, fixnum, "eql?", num_eql, ARGS_REQ(1)); /* 15.2.8.3.16 */
mrb_define_method(mrb, fixnum, "floor", num_floor, ARGS_NONE()); /* 15.2.8.3.17 */
mrb_define_method(mrb, fixnum, "hash", flo_hash, ARGS_NONE()); /* 15.2.8.3.18 */
mrb_define_method(mrb, fixnum, "next", int_succ, ARGS_NONE()); /* 15.2.8.3.19 */
mrb_define_method(mrb, fixnum, "round", num_round, ARGS_ANY()); /* 15.2.8.3.20 */
mrb_define_method(mrb, fixnum, "succ", fix_succ, ARGS_NONE()); /* 15.2.8.3.21 */
mrb_define_method(mrb, fixnum, "to_f", fix_to_f, ARGS_NONE()); /* 15.2.8.3.23 */
mrb_define_method(mrb, fixnum, "to_i", int_to_i, ARGS_NONE()); /* 15.2.8.3.24 */
mrb_define_method(mrb, fixnum, "to_s", fix_to_s, ARGS_NONE()); /* 15.2.8.3.25 */
mrb_define_method(mrb, fixnum, "truncate", int_to_i, ARGS_NONE()); /* 15.2.8.3.26 */
mrb_define_method(mrb, fixnum, "divmod", fix_divmod, ARGS_REQ(1)); /* 15.2.8.3.30 (x) */
/* Float Class */
fl = mrb->float_class = mrb_define_class(mrb, "Float", numeric);
mrb_undef_method(mrb, fl, "new");
mrb_define_method(mrb, fl, "+", flo_plus, ARGS_REQ(1)); /* 15.2.9.3.1 */
mrb_define_method(mrb, fl, "-", flo_minus, ARGS_REQ(1)); /* 15.2.9.3.2 */
mrb_define_method(mrb, fl, "*", flo_mul, ARGS_REQ(1)); /* 15.2.9.3.3 */
mrb_define_method(mrb, fl, "%", flo_mod, ARGS_REQ(1)); /* 15.2.9.3.5 */
mrb_define_method(mrb, fl, "==", flo_eq, ARGS_REQ(1)); /* 15.2.9.3.7 */
mrb_define_method(mrb, fl, "ceil", flo_ceil, ARGS_NONE()); /* 15.2.9.3.8 */
mrb_define_method(mrb, fl, "finite?", flo_finite_p, ARGS_NONE()); /* 15.2.9.3.9 */
mrb_define_method(mrb, fl, "floor", flo_floor, ARGS_NONE()); /* 15.2.9.3.10 */
mrb_define_method(mrb, fl, "infinite?", flo_infinite_p, ARGS_NONE()); /* 15.2.9.3.11 */
mrb_define_method(mrb, fl, "round", flo_round, ARGS_ANY()); /* 15.2.9.3.12 */
mrb_define_method(mrb, fl, "to_f", flo_to_f, ARGS_NONE()); /* 15.2.9.3.13 */
mrb_define_method(mrb, fl, "to_i", flo_truncate, ARGS_NONE()); /* 15.2.9.3.14 */
mrb_define_method(mrb, fl, "truncate", flo_truncate, ARGS_NONE()); /* 15.2.9.3.15 */
mrb_define_method(mrb, fl, "to_s", flo_to_s, ARGS_NONE()); /* 15.2.9.3.16(x) */
}
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