picrin/lib/number.c

367 lines
10 KiB
C

/**
* See Copyright Notice in picrin.h
*/
#include "picrin.h"
#include "picrin/extra.h"
static pic_value
pic_number_number_p(pic_state *pic)
{
pic_value v;
pic_get_args(pic, "o", &v);
return pic_bool_value(pic, pic_float_p(pic, v) || pic_int_p(pic, v));
}
static pic_value
pic_number_exact_p(pic_state *pic)
{
pic_value v;
pic_get_args(pic, "o", &v);
return pic_bool_value(pic, pic_int_p(pic, v));
}
static pic_value
pic_number_inexact_p(pic_state *pic)
{
pic_value v;
pic_get_args(pic, "o", &v);
return pic_bool_value(pic, pic_float_p(pic, v));
}
static pic_value
pic_number_inexact(pic_state *pic)
{
double f;
pic_get_args(pic, "f", &f);
return pic_float_value(pic, f);
}
static pic_value
pic_number_exact(pic_state *pic)
{
double f;
pic_get_args(pic, "f", &f);
return pic_int_value(pic, (int)f);
}
#define pic_define_aop(name, op, guard) \
pic_value \
name(pic_state *pic, pic_value a, pic_value b) \
{ \
double f; \
if (pic_int_p(pic, a) && pic_int_p(pic, b)) { \
f = (double)pic_int(pic, a) op (double)pic_int(pic, b); \
return (INT_MIN <= f && f <= INT_MAX && guard) \
? pic_int_value(pic, (int)f) \
: pic_float_value(pic, f); \
} else if (pic_float_p(pic, a) && pic_float_p(pic, b)) { \
return pic_float_value(pic, pic_float(pic, a) op pic_float(pic, b)); \
} else if (pic_int_p(pic, a) && pic_float_p(pic, b)) { \
return pic_float_value(pic, pic_int(pic, a) op pic_float(pic, b)); \
} else if (pic_float_p(pic, a) && pic_int_p(pic, b)) { \
return pic_float_value(pic, pic_float(pic, a) op pic_int(pic, b)); \
} else { \
pic_error(pic, #name ": non-number operand given", 0); \
} \
PIC_UNREACHABLE(); \
}
pic_define_aop(pic_add, +, true)
pic_define_aop(pic_sub, -, true)
pic_define_aop(pic_mul, *, true)
pic_define_aop(pic_div, /, f == (int)f)
#define pic_define_cmp(name, op) \
bool \
name(pic_state *pic, pic_value a, pic_value b) \
{ \
if (pic_int_p(pic, a) && pic_int_p(pic, b)) { \
return pic_int(pic, a) op pic_int(pic, b); \
} else if (pic_float_p(pic, a) && pic_float_p(pic, b)) { \
return pic_float(pic, a) op pic_float(pic, b); \
} else if (pic_int_p(pic, a) && pic_float_p(pic, b)) { \
return pic_int(pic, a) op pic_float(pic, b); \
} else if (pic_float_p(pic, a) && pic_int_p(pic, b)) { \
return pic_float(pic, a) op pic_int(pic, b); \
} else { \
pic_error(pic, #name ": non-number operand given", 0); \
} \
PIC_UNREACHABLE(); \
}
pic_define_cmp(pic_eq, ==)
pic_define_cmp(pic_lt, <)
pic_define_cmp(pic_le, <=)
pic_define_cmp(pic_gt, >)
pic_define_cmp(pic_ge, >=)
#define DEFINE_CMP(op) \
static pic_value \
pic_number_##op(pic_state *pic) \
{ \
int argc, i; \
pic_value *argv; \
\
pic_get_args(pic, "*", &argc, &argv); \
\
if (argc < 2) { \
return pic_true_value(pic); \
} \
\
for (i = 1; i < argc; ++i) { \
if (! pic_##op(pic, argv[i - 1], argv[i])) { \
return pic_false_value(pic); \
} \
} \
return pic_true_value(pic); \
}
DEFINE_CMP(eq)
DEFINE_CMP(lt)
DEFINE_CMP(le)
DEFINE_CMP(gt)
DEFINE_CMP(ge)
#define DEFINE_AOP(op, v1, c0) \
static pic_value \
pic_number_##op(pic_state *pic) \
{ \
int argc, i; \
pic_value *argv, tmp; \
\
pic_get_args(pic, "*", &argc, &argv); \
\
if (argc == 0) { \
c0; \
} \
else if (argc == 1) { \
return v1; \
} \
\
tmp = argv[0]; \
for (i = 1; i < argc; ++i) { \
tmp = pic_##op(pic, tmp, argv[i]); \
} \
return tmp; \
}
DEFINE_AOP(add, argv[0], do {
return pic_int_value(pic, 0);
} while (0))
DEFINE_AOP(mul, argv[0], do {
return pic_int_value(pic, 1);
} while (0))
DEFINE_AOP(sub, pic_sub(pic, pic_int_value(pic, 0), argv[0]), do {
pic_error(pic, "-: at least one argument required", 0);
} while (0))
DEFINE_AOP(div, pic_div(pic, pic_int_value(pic, 1), argv[0]), do {
pic_error(pic, "/: at least one argument required", 0);
} while (0))
static int
number_string_length(int val, int radix)
{
unsigned long v = val; /* in case val == INT_MIN */
int count = 0;
if (val == 0) {
return 1;
}
if (val < 0) {
v = -val;
count = 1;
}
while (v > 0) {
++count;
v /= radix;
}
return count;
}
static void
number_string(int val, int radix, int length, char *buffer) {
const char digits[37] = "0123456789abcdefghijklmnopqrstuvwxyz";
unsigned long v = val;
int i;
if (val == 0) {
buffer[0] = '0';
buffer[1] = '\0';
return;
}
if (val < 0) {
buffer[0] = '-';
v = -val;
}
for(i = length - 1; v > 0; --i) {
buffer[i] = digits[v % radix];
v /= radix;
}
buffer[length] = '\0';
return;
}
static pic_value
pic_number_number_to_string(pic_state *pic)
{
double f;
bool e;
int radix = 10;
pic_value str;
pic_get_args(pic, "F|i", &f, &e, &radix);
if (radix < 2 || radix > 36) {
pic_error(pic, "number->string: invalid radix (between 2 and 36, inclusive)", 1, pic_int_value(pic, radix));
}
if (e) {
int ival = (int) f;
int ilen = number_string_length(ival, radix);
char *buf = pic_alloca(pic, ilen + 1);
number_string(ival, radix, ilen, buf);
str = pic_str_value(pic, buf, ilen);
}
else {
pic_value port = pic_fmemopen(pic, NULL, 0, "w");
const char *buf;
int len;
pic_fprintf(pic, port, "%f", f);
pic_fgetbuf(pic, port, &buf, &len);
str = pic_str_value(pic, buf, len);
pic_fclose(pic, port);
}
return str;
}
static bool
strcaseeq(const char *s1, const char *s2)
{
char a, b;
while ((a = *s1++) * (b = *s2++)) {
if (tolower(a) != tolower(b))
return false;
}
return a == b;
}
static pic_value
string_to_number(pic_state *pic, const char *str)
{
double flt;
const char *c = str;
bool isint = 1;
if (*c == '+' || *c == '-')
c++;
if (! isdigit(*c++)) {
return pic_false_value(pic);
}
while (isdigit(*c)) c++;
if (*c == '.') {
isint = false;
c++;
while (isdigit(*c)) c++;
}
if (*c == 'e' || *c == 'E') {
isint = false;
c++;
if (*c == '+' || *c == '-')
c++;
if (! isdigit(*c++)) {
return pic_false_value(pic);
}
while (isdigit(*c)) c++;
}
if (*c != '\0') {
return pic_false_value(pic);
}
flt = PIC_CSTRING_TO_DOUBLE(str);
if (isint && INT_MIN <= flt && flt <= INT_MAX) {
return pic_int_value(pic, flt);
} else {
return pic_float_value(pic, flt);
}
}
static pic_value
pic_number_string_to_number(pic_state *pic)
{
const char *str;
int radix = 10;
long num;
char *eptr;
pic_get_args(pic, "z|i", &str, &radix);
if (strcaseeq(str, "+inf.0"))
return pic_float_value(pic, 1.0 / 0.0);
if (strcaseeq(str, "-inf.0"))
return pic_float_value(pic, -1.0 / 0.0);
if (strcaseeq(str, "+nan.0"))
return pic_float_value(pic, 0.0 / 0.0);
if (strcaseeq(str, "-nan.0"))
return pic_float_value(pic, -0.0 / 0.0);
num = strtol(str, &eptr, radix);
if (*eptr == '\0') {
return INT_MIN <= num && num <= INT_MAX ? pic_int_value(pic, num) : pic_float_value(pic, num);
}
return string_to_number(pic, str);
}
void
pic_init_number(pic_state *pic)
{
size_t ai = pic_enter(pic);
pic_defun(pic, "number?", pic_number_number_p);
pic_leave(pic, ai);
pic_defun(pic, "exact?", pic_number_exact_p);
pic_defun(pic, "inexact?", pic_number_inexact_p);
pic_leave(pic, ai);
pic_defun(pic, "inexact", pic_number_inexact);
pic_defun(pic, "exact", pic_number_exact);
pic_leave(pic, ai);
pic_defun(pic, "=", pic_number_eq);
pic_defun(pic, "<", pic_number_lt);
pic_defun(pic, ">", pic_number_gt);
pic_defun(pic, "<=", pic_number_le);
pic_defun(pic, ">=", pic_number_ge);
pic_leave(pic, ai);
pic_defun(pic, "+", pic_number_add);
pic_defun(pic, "-", pic_number_sub);
pic_defun(pic, "*", pic_number_mul);
pic_defun(pic, "/", pic_number_div);
pic_leave(pic, ai);
pic_defun(pic, "number->string", pic_number_number_to_string);
pic_defun(pic, "string->number", pic_number_string_to_number);
pic_leave(pic, ai);
}