circuitpython/py/parsenum.c

170 lines
4.3 KiB
C

#include <stdlib.h>
#include "misc.h"
#include "mpconfig.h"
#include "qstr.h"
#include "nlr.h"
#include "obj.h"
#include "parsenum.h"
#if defined(UNIX)
#include <ctype.h>
#include <errno.h>
mp_obj_t mp_parse_num_integer(const char *restrict str, uint len, int base) {
// TODO at the moment we ignore len; we should honour it!
// TODO detect integer overflow and return bignum
int c, neg = 0;
const char *p = str;
char *num;
long found;
// check radix base
if ((base != 0 && base < 2) || base > 36) {
nlr_jump(mp_obj_new_exception_msg(&mp_type_ValueError, "ValueError: int() arg 2 must be >=2 and <= 36"));
}
// skip surrounded whitespace
while (isspace((c = *(p++))));
if (c == 0) {
goto value_error;
}
// preced sign
if (c == '+' || c == '-') {
neg = - (c == '-');
c = *(p++);
}
// find real radix base, and strip preced '0x', '0o' and '0b'
// TODO somehow merge with similar code in parse.c
if ((base == 0 || base == 16) && c == '0') {
c = *(p++);
if ((c | 32) == 'x') {
base = 16;
} else if (base == 0 && (c | 32) == 'o') {
base = 8;
} else if (base == 0 && (c | 32) == 'b') {
base = 2;
} else {
base = 10;
p -= 2;
}
} else if (base == 8 && c == '0') {
c = *(p++);
if ((c | 32) != 'o') {
p -= 2;
}
} else if (base == 2 && c == '0') {
c = *(p++);
if ((c | 32) != 'b') {
p -= 2;
}
} else {
if (base == 0) base = 10;
p--;
}
errno = 0;
found = strtol(p, &num, base);
if (errno) {
goto value_error;
} else if (found && *(num) == 0) {
goto done;
} else if (found || num != p) {
goto check_tail_space;
} else {
goto value_error;
}
check_tail_space:
if (*(num) != 0) {
while (isspace((c = *(num++))));
if (c != 0) {
goto value_error;
}
}
done:
return MP_OBJ_NEW_SMALL_INT((found ^ neg) - neg);
value_error:
nlr_jump(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "invalid literal for int() with base %d: '%s'", base, str));
}
#else /* defined(UNIX) */
mp_obj_t mp_parse_num_integer(const char *restrict str, uint len, int base) {
// TODO port strtol to stm
return MP_OBJ_NEW_SMALL_INT(0);
}
#endif /* defined(UNIX) */
#define PARSE_DEC_IN_INTG (1)
#define PARSE_DEC_IN_FRAC (2)
#define PARSE_DEC_IN_EXP (3)
mp_obj_t mp_parse_num_decimal(const char *str, uint len) {
#if MICROPY_ENABLE_FLOAT
int in = PARSE_DEC_IN_INTG;
mp_float_t dec_val = 0;
bool exp_neg = false;
int exp_val = 0;
int exp_extra = 0;
bool imag = false;
const char *top = str + len;
for (; str < top; str++) {
int dig = *str;
if ('0' <= dig && dig <= '9') {
dig -= '0';
if (in == PARSE_DEC_IN_EXP) {
exp_val = 10 * exp_val + dig;
} else {
dec_val = 10 * dec_val + dig;
if (in == PARSE_DEC_IN_FRAC) {
exp_extra -= 1;
}
}
} else if (in == PARSE_DEC_IN_INTG && dig == '.') {
in = PARSE_DEC_IN_FRAC;
} else if (in != PARSE_DEC_IN_EXP && (dig == 'E' || dig == 'e')) {
in = PARSE_DEC_IN_EXP;
if (str[1] == '+') {
str++;
} else if (str[1] == '-') {
str++;
exp_neg = true;
}
} else if (dig == 'J' || dig == 'j') {
str++;
imag = true;
break;
} else {
// unknown character
break;
}
}
if (*str != 0) {
nlr_jump(mp_obj_new_exception_msg(&mp_type_SyntaxError, "invalid syntax for number"));
}
if (exp_neg) {
exp_val = -exp_val;
}
exp_val += exp_extra;
for (; exp_val > 0; exp_val--) {
dec_val *= 10;
}
for (; exp_val < 0; exp_val++) {
dec_val *= 0.1;
}
if (imag) {
return mp_obj_new_complex(0, dec_val);
} else {
return mp_obj_new_float(dec_val);
}
#else
nlr_jump(mp_obj_new_exception_msg(&mp_type_SyntaxError, "decimal numbers not supported"));
#endif
}