micropython/py/mpprint.c at parse-bytecode · MicroPerceptron/micropython · GitHub

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* This file is part of the MicroPython project, http://micropython.org/

* The MIT License (MIT)

* Permission is hereby granted, free of charge, to any person obtaining a copy

* of this software and associated documentation files (the "Software"), to deal

* in the Software without restriction, including without limitation the rights

* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

* copies of the Software, and to permit persons to whom the Software is

* furnished to do so, subject to the following conditions:

* The above copyright notice and this permission notice shall be included in

* all copies or substantial portions of the Software.

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

* THE SOFTWARE.

#include <assert.h>

#include <stdarg.h>

#include <stdint.h>

#include <stdio.h>

#include <string.h>

#include "py/mphal.h"

#include "py/mpprint.h"

#include "py/obj.h"

#include "py/objint.h"

#include "py/runtime.h"

#if MICROPY_PY_BUILTINS_FLOAT

#include "py/formatfloat.h"

#endif

static const char pad_spaces[] = " ";

static const char pad_zeroes[] = "0000000000000000";

STATIC void plat_print_strn(void *env, const char *str, size_t len) {

(void)env;

MP_PLAT_PRINT_STRN(str, len);

}

const mp_print_t mp_plat_print = {NULL, plat_print_strn};

int mp_print_str(const mp_print_t *print, const char *str) {

size_t len = strlen(str);

if (len) {

print->print_strn(print->data, str, len);

}

return len;

}

int mp_print_strn(const mp_print_t *print, const char *str, size_t len, int flags, char fill, int width) {

int left_pad = 0;

int right_pad = 0;

int pad = width - len;

int pad_size;

int total_chars_printed = 0;

const char *pad_chars;

if (!fill || fill == ' ') {

pad_chars = pad_spaces;

pad_size = sizeof(pad_spaces) - 1;

} else if (fill == '0') {

pad_chars = pad_zeroes;

pad_size = sizeof(pad_zeroes) - 1;

} else {

// Other pad characters are fairly unusual, so we'll take the hit

// and output them 1 at a time.

pad_chars = &fill;

pad_size = 1;

}

if (flags & PF_FLAG_CENTER_ADJUST) {

left_pad = pad / 2;

right_pad = pad - left_pad;

} else if (flags & PF_FLAG_LEFT_ADJUST) {

right_pad = pad;

} else {

left_pad = pad;

}

if (left_pad > 0) {

total_chars_printed += left_pad;

while (left_pad > 0) {

int p = left_pad;

if (p > pad_size) {

p = pad_size;

}

print->print_strn(print->data, pad_chars, p);

left_pad -= p;

}

if (len) {

print->print_strn(print->data, str, len);

total_chars_printed += len;

}

if (right_pad > 0) {

total_chars_printed += right_pad;

while (right_pad > 0) {

int p = right_pad;

if (p > pad_size) {

p = pad_size;

}

print->print_strn(print->data, pad_chars, p);

right_pad -= p;

}

return total_chars_printed;

}

// 32-bits is 10 digits, add 3 for commas, 1 for sign, 1 for terminating null

// We can use 16 characters for 32-bit and 32 characters for 64-bit

#define INT_BUF_SIZE (sizeof(mp_int_t) * 4)

// Our mp_vprintf function below does not support the '#' format modifier to

// print the prefix of a non-base-10 number, so we don't need code for this.

#define SUPPORT_INT_BASE_PREFIX (0)

// This function is used exclusively by mp_vprintf to format ints.

// It needs to be a separate function to mp_print_mp_int, since converting to a mp_int looses the MSB.

STATIC int mp_print_int(const mp_print_t *print, mp_uint_t x, int sgn, int base, int base_char, int flags, char fill, int width) {

char sign = 0;

if (sgn) {

if ((mp_int_t)x < 0) {

sign = '-';

x = -x;

} else if (flags & PF_FLAG_SHOW_SIGN) {

sign = '+';

} else if (flags & PF_FLAG_SPACE_SIGN) {

sign = ' ';

}

char buf[INT_BUF_SIZE];

char *b = buf + INT_BUF_SIZE;

if (x == 0) {

*(--b) = '0';

} else {

do {

int c = x % base;

x /= base;

if (c >= 10) {

c += base_char - 10;

} else {

c += '0';

}

*(--b) = c;

} while (b > buf && x != 0);

}

#if SUPPORT_INT_BASE_PREFIX

char prefix_char = '\0';

if (flags & PF_FLAG_SHOW_PREFIX) {

if (base == 2) {

prefix_char = base_char + 'b' - 'a';

} else if (base == 8) {

prefix_char = base_char + 'o' - 'a';

} else if (base == 16) {

prefix_char = base_char + 'x' - 'a';

}

#endif

int len = 0;

if (flags & PF_FLAG_PAD_AFTER_SIGN) {

if (sign) {

len += mp_print_strn(print, &sign, 1, flags, fill, 1);

width--;

}

#if SUPPORT_INT_BASE_PREFIX

if (prefix_char) {

len += mp_print_strn(print, "0", 1, flags, fill, 1);

len += mp_print_strn(print, &prefix_char, 1, flags, fill, 1);

width -= 2;

}

#endif

} else {

#if SUPPORT_INT_BASE_PREFIX

if (prefix_char && b > &buf[1]) {

*(--b) = prefix_char;

*(--b) = '0';

}

#endif

if (sign && b > buf) {

*(--b) = sign;

}

len += mp_print_strn(print, b, buf + INT_BUF_SIZE - b, flags, fill, width);

return len;

}

int mp_print_mp_int(const mp_print_t *print, mp_obj_t x, int base, int base_char, int flags, char fill, int width, int prec) {

// These are the only values for "base" that are required to be supported by this

// function, since Python only allows the user to format integers in these bases.

// If needed this function could be generalised to handle other values.

assert(base == 2 || base == 8 || base == 10 || base == 16);

if (!MP_OBJ_IS_INT(x)) {

// This will convert booleans to int, or raise an error for

// non-integer types.

x = MP_OBJ_NEW_SMALL_INT(mp_obj_get_int(x));

}

if ((flags & (PF_FLAG_LEFT_ADJUST | PF_FLAG_CENTER_ADJUST)) == 0 && fill == '0') {

if (prec > width) {

width = prec;

}

prec = 0;

}

char prefix_buf[4];

char *prefix = prefix_buf;

if (mp_obj_int_sign(x) >= 0) {

if (flags & PF_FLAG_SHOW_SIGN) {

*prefix++ = '+';

} else if (flags & PF_FLAG_SPACE_SIGN) {

*prefix++ = ' ';

}

if (flags & PF_FLAG_SHOW_PREFIX) {

if (base == 2) {

*prefix++ = '0';

*prefix++ = base_char + 'b' - 'a';

} else if (base == 8) {

*prefix++ = '0';

if (flags & PF_FLAG_SHOW_OCTAL_LETTER) {

*prefix++ = base_char + 'o' - 'a';

}

} else if (base == 16) {

*prefix++ = '0';

*prefix++ = base_char + 'x' - 'a';

}

*prefix = '\0';

int prefix_len = prefix - prefix_buf;

prefix = prefix_buf;

char comma = '\0';

if (flags & PF_FLAG_SHOW_COMMA) {

comma = ',';

}

// The size of this buffer is rather arbitrary. If it's not large

// enough, a dynamic one will be allocated.

char stack_buf[sizeof(mp_int_t) * 4];

char *buf = stack_buf;

size_t buf_size = sizeof(stack_buf);

size_t fmt_size = 0;

char *str;

if (prec > 1) {

flags |= PF_FLAG_PAD_AFTER_SIGN;

}

char sign = '\0';

if (flags & PF_FLAG_PAD_AFTER_SIGN) {

// We add the pad in this function, so since the pad goes after

// the sign & prefix, we format without a prefix

str = mp_obj_int_formatted(&buf, &buf_size, &fmt_size,

x, base, NULL, base_char, comma);

if (*str == '-') {

sign = *str++;

fmt_size--;

}

} else {

str = mp_obj_int_formatted(&buf, &buf_size, &fmt_size,

x, base, prefix, base_char, comma);

}

int spaces_before = 0;

int spaces_after = 0;

if (prec > 1) {

// If prec was specified, then prec specifies the width to zero-pad the

// the number to. This zero-padded number then gets left or right

// aligned in width characters.

int prec_width = fmt_size; // The digits

if (prec_width < prec) {

prec_width = prec;

}

if (flags & PF_FLAG_PAD_AFTER_SIGN) {

if (sign) {

prec_width++;

}

prec_width += prefix_len;

}

if (prec_width < width) {

if (flags & PF_FLAG_LEFT_ADJUST) {

spaces_after = width - prec_width;

} else {

spaces_before = width - prec_width;

}

fill = '0';

flags &= ~PF_FLAG_LEFT_ADJUST;

}

int len = 0;

if (spaces_before) {

len += mp_print_strn(print, "", 0, 0, ' ', spaces_before);

}

if (flags & PF_FLAG_PAD_AFTER_SIGN) {

// pad after sign implies pad after prefix as well.

if (sign) {

len += mp_print_strn(print, &sign, 1, 0, 0, 1);

width--;

}

if (prefix_len) {

len += mp_print_strn(print, prefix, prefix_len, 0, 0, 1);

width -= prefix_len;

}

if (prec > 1) {

width = prec;

}

len += mp_print_strn(print, str, fmt_size, flags, fill, width);

if (spaces_after) {

len += mp_print_strn(print, "", 0, 0, ' ', spaces_after);

}

if (buf != stack_buf) {

m_del(char, buf, buf_size);

}

return len;

}

#if MICROPY_PY_BUILTINS_FLOAT

int mp_print_float(const mp_print_t *print, mp_float_t f, char fmt, int flags, char fill, int width, int prec) {

char buf[32];

char sign = '\0';

int chrs = 0;

if (flags & PF_FLAG_SHOW_SIGN) {

sign = '+';

}

else

if (flags & PF_FLAG_SPACE_SIGN) {

sign = ' ';

}

int len = mp_format_float(f, buf, sizeof(buf), fmt, prec, sign);

char *s = buf;

if ((flags & PF_FLAG_ADD_PERCENT) && (size_t)(len + 1) < sizeof(buf)) {

buf[len++] = '%';

buf[len] = '\0';

}

// buf[0] < '0' returns true if the first character is space, + or -

if ((flags & PF_FLAG_PAD_AFTER_SIGN) && buf[0] < '0') {

// We have a sign character

s++;

chrs += mp_print_strn(print, &buf[0], 1, 0, 0, 1);

width--;

len--;

}

chrs += mp_print_strn(print, s, len, flags, fill, width);

return chrs;

}

#endif

int mp_printf(const mp_print_t *print, const char *fmt, ...) {

va_list ap;

va_start(ap, fmt);

int ret = mp_vprintf(print, fmt, ap);

va_end(ap);

return ret;

}

int mp_vprintf(const mp_print_t *print, const char *fmt, va_list args) {

int chrs = 0;

for (;;) {

{

const char *f = fmt;

while (*f != '\0' && *f != '%') {

++f; // XXX UTF8 advance char

}

if (f > fmt) {

print->print_strn(print->data, fmt, f - fmt);

chrs += f - fmt;

fmt = f;

}

if (*fmt == '\0') {

break;

}

// move past % character

++fmt;

// parse flags, if they exist

int flags = 0;

char fill = ' ';

while (*fmt != '\0') {

if (*fmt == '-') flags |= PF_FLAG_LEFT_ADJUST;

else if (*fmt == '+') flags |= PF_FLAG_SHOW_SIGN;

else if (*fmt == ' ') flags |= PF_FLAG_SPACE_SIGN;

else if (*fmt == '!') flags |= PF_FLAG_NO_TRAILZ;

else if (*fmt == '0') {

flags |= PF_FLAG_PAD_AFTER_SIGN;

fill = '0';

} else break;

++fmt;

}

// parse width, if it exists

int width = 0;

for (; '0' <= *fmt && *fmt <= '9'; ++fmt) {

width = width * 10 + *fmt - '0';

}

// parse precision, if it exists

int prec = -1;

if (*fmt == '.') {

++fmt;

if (*fmt == '*') {

++fmt;

prec = va_arg(args, int);

} else {

prec = 0;

for (; '0' <= *fmt && *fmt <= '9'; ++fmt) {

prec = prec * 10 + *fmt - '0';

}

if (prec < 0) {

prec = 0;

}

// parse long specifiers (current not used)

//bool long_arg = false;

if (*fmt == 'l') {

++fmt;

//long_arg = true;

}

if (*fmt == '\0') {

break;

}

switch (*fmt) {

case 'b':

if (va_arg(args, int)) {

chrs += mp_print_strn(print, "true", 4, flags, fill, width);

} else {

chrs += mp_print_strn(print, "false", 5, flags, fill, width);

}

break;

case 'c':

{

char str = va_arg(args, int);

chrs += mp_print_strn(print, &str, 1, flags, fill, width);

break;

}

case 'q':

{

qstr qst = va_arg(args, qstr);

size_t len;

const char *str = (const char*)qstr_data(qst, &len);

if (prec < 0) {

prec = len;

}

chrs += mp_print_strn(print, str, prec, flags, fill, width);

break;

}

case 's':

{

const char *str = va_arg(args, const char*);

if (str) {

if (prec < 0) {

prec = strlen(str);

}

chrs += mp_print_strn(print, str, prec, flags, fill, width);

} else {

chrs += mp_print_strn(print, "(null)", 6, flags, fill, width);

}

break;

}

case 'u':

chrs += mp_print_int(print, va_arg(args, unsigned int), 0, 10, 'a', flags, fill, width);

break;

case 'd':

chrs += mp_print_int(print, va_arg(args, int), 1, 10, 'a', flags, fill, width);

break;

case 'x':

chrs += mp_print_int(print, va_arg(args, unsigned int), 0, 16, 'a', flags, fill, width);

break;

case 'X':

chrs += mp_print_int(print, va_arg(args, unsigned int), 0, 16, 'A', flags, fill, width);

break;

case 'p':

case 'P': // don't bother to handle upcase for 'P'

chrs += mp_print_int(print, va_arg(args, unsigned int), 0, 16, 'a', flags, fill, width);

break;

#if MICROPY_PY_BUILTINS_FLOAT

case 'e':

case 'E':

case 'f':

case 'F':

case 'g':

case 'G':

{

#if ((MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_FLOAT) || (MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_DOUBLE))

mp_float_t f = va_arg(args, double);

chrs += mp_print_float(print, f, *fmt, flags, fill, width, prec);

#else

#error Unknown MICROPY FLOAT IMPL

#endif

break;

}

#endif

// Because 'l' is eaten above, another 'l' means %ll. We need to support

// this length specifier for OBJ_REPR_D (64-bit NaN boxing).

// TODO Either enable this unconditionally, or provide a specific config var.

#if (MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_D) || defined(_WIN64)

case 'l': {

unsigned long long int arg_value = va_arg(args, unsigned long long int);

++fmt;

if (*fmt == 'u' || *fmt == 'd') {

chrs += mp_print_int(print, arg_value, *fmt == 'd', 10, 'a', flags, fill, width);

break;

}

assert(!"unsupported fmt char");

}

#endif

default:

// if it's not %% then it's an unsupported format character

assert(*fmt == '%' || !"unsupported fmt char");

print->print_strn(print->data, fmt, 1);

chrs += 1;

break;

}

++fmt;

}

return chrs;

}

micropython/py/mpprint.c at parse-bytecode · MicroPerceptron/micropython · GitHub

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