cpython/Python/formatter_unicode.c at pythoncapi · pythoncapi/cpython · GitHub

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/* implements the unicode (as opposed to string) version of the

built-in formatters for string, int, float. that is, the versions

of int.__float__, etc., that take and return unicode objects */

#include "Python.h"

#include <locale.h>

/* Raises an exception about an unknown presentation type for this

* type. */

static void

unknown_presentation_type(Py_UCS4 presentation_type,

const char* type_name)

{

/* %c might be out-of-range, hence the two cases. */

if (presentation_type > 32 && presentation_type < 128)

PyErr_Format(PyExc_ValueError,

"Unknown format code '%c' "

"for object of type '%.200s'",

(char)presentation_type,

type_name);

else

PyErr_Format(PyExc_ValueError,

"Unknown format code '\\x%x' "

"for object of type '%.200s'",

(unsigned int)presentation_type,

type_name);

}

static void

invalid_comma_type(Py_UCS4 presentation_type)

{

if (presentation_type > 32 && presentation_type < 128)

PyErr_Format(PyExc_ValueError,

"Cannot specify ',' with '%c'.",

(char)presentation_type);

else

PyErr_Format(PyExc_ValueError,

"Cannot specify ',' with '\\x%x'.",

(unsigned int)presentation_type);

}

static void

invalid_comma_and_underscore(void)

{

PyErr_Format(PyExc_ValueError, "Cannot specify both ',' and '_'.");

}

get_integer consumes 0 or more decimal digit characters from an

input string, updates *result with the corresponding positive

integer, and returns the number of digits consumed.

returns -1 on error.

static int

get_integer(PyObject *str, Py_ssize_t *ppos, Py_ssize_t end,

Py_ssize_t *result)

{

Py_ssize_t accumulator, digitval, pos = *ppos;

int numdigits;

int kind = PyUnicode_KIND(str);

void *data = PyUnicode_DATA(str);

accumulator = numdigits = 0;

for (; pos < end; pos++, numdigits++) {

digitval = Py_UNICODE_TODECIMAL(PyUnicode_READ(kind, data, pos));

if (digitval < 0)

break;

Detect possible overflow before it happens:

accumulator * 10 + digitval > PY_SSIZE_T_MAX if and only if

accumulator > (PY_SSIZE_T_MAX - digitval) / 10.

if (accumulator > (PY_SSIZE_T_MAX - digitval) / 10) {

PyErr_Format(PyExc_ValueError,

"Too many decimal digits in format string");

*ppos = pos;

return -1;

}

accumulator = accumulator * 10 + digitval;

}

*ppos = pos;

*result = accumulator;

return numdigits;

}

/************************************************************************/

/*********** standard format specifier parsing **************************/

/************************************************************************/

/* returns true if this character is a specifier alignment token */

Py_LOCAL_INLINE(int)

is_alignment_token(Py_UCS4 c)

{

switch (c) {

case '<': case '>': case '=': case '^':

return 1;

default:

return 0;

}

/* returns true if this character is a sign element */

Py_LOCAL_INLINE(int)

is_sign_element(Py_UCS4 c)

{

switch (c) {

case ' ': case '+': case '-':

return 1;

default:

return 0;

}

/* Locale type codes. LT_NO_LOCALE must be zero. */

enum LocaleType {

LT_NO_LOCALE = 0,

LT_DEFAULT_LOCALE,

LT_UNDERSCORE_LOCALE,

LT_UNDER_FOUR_LOCALE,

LT_CURRENT_LOCALE

};

typedef struct {

Py_UCS4 fill_char;

Py_UCS4 align;

int alternate;

Py_UCS4 sign;

Py_ssize_t width;

enum LocaleType thousands_separators;

Py_ssize_t precision;

Py_UCS4 type;

} InternalFormatSpec;

#if 0

/* Occasionally useful for debugging. Should normally be commented out. */

static void

DEBUG_PRINT_FORMAT_SPEC(InternalFormatSpec *format)

{

printf("internal format spec: fill_char %d\n", format->fill_char);

printf("internal format spec: align %d\n", format->align);

printf("internal format spec: alternate %d\n", format->alternate);

printf("internal format spec: sign %d\n", format->sign);

printf("internal format spec: width %zd\n", format->width);

printf("internal format spec: thousands_separators %d\n",

format->thousands_separators);

printf("internal format spec: precision %zd\n", format->precision);

printf("internal format spec: type %c\n", format->type);

printf("\n");

}

#endif

ptr points to the start of the format_spec, end points just past its end.

fills in format with the parsed information.

returns 1 on success, 0 on failure.

if failure, sets the exception

static int

parse_internal_render_format_spec(PyObject *format_spec,

Py_ssize_t start, Py_ssize_t end,

InternalFormatSpec *format,

char default_type,

char default_align)

{

Py_ssize_t pos = start;

int kind = PyUnicode_KIND(format_spec);

void *data = PyUnicode_DATA(format_spec);

/* end-pos is used throughout this code to specify the length of

the input string */

#define READ_spec(index) PyUnicode_READ(kind, data, index)

Py_ssize_t consumed;

int align_specified = 0;

int fill_char_specified = 0;

format->fill_char = ' ';

format->align = default_align;

format->alternate = 0;

format->sign = '\0';

format->width = -1;

format->thousands_separators = LT_NO_LOCALE;

format->precision = -1;

format->type = default_type;

/* If the second char is an alignment token,

then parse the fill char */

if (end-pos >= 2 && is_alignment_token(READ_spec(pos+1))) {

format->align = READ_spec(pos+1);

format->fill_char = READ_spec(pos);

fill_char_specified = 1;

align_specified = 1;

pos += 2;

}

else if (end-pos >= 1 && is_alignment_token(READ_spec(pos))) {

format->align = READ_spec(pos);

align_specified = 1;

++pos;

}

/* Parse the various sign options */

if (end-pos >= 1 && is_sign_element(READ_spec(pos))) {

format->sign = READ_spec(pos);

++pos;

}

/* If the next character is #, we're in alternate mode. This only

applies to integers. */

if (end-pos >= 1 && READ_spec(pos) == '#') {

format->alternate = 1;

++pos;

}

/* The special case for 0-padding (backwards compat) */

if (!fill_char_specified && end-pos >= 1 && READ_spec(pos) == '0') {

format->fill_char = '0';

if (!align_specified) {

format->align = '=';

}

++pos;

}

consumed = get_integer(format_spec, &pos, end, &format->width);

if (consumed == -1)

/* Overflow error. Exception already set. */

return 0;

/* If consumed is 0, we didn't consume any characters for the

width. In that case, reset the width to -1, because

get_integer() will have set it to zero. -1 is how we record

that the width wasn't specified. */

if (consumed == 0)

format->width = -1;

/* Comma signifies add thousands separators */

if (end-pos && READ_spec(pos) == ',') {

format->thousands_separators = LT_DEFAULT_LOCALE;

++pos;

}

/* Underscore signifies add thousands separators */

if (end-pos && READ_spec(pos) == '_') {

if (format->thousands_separators != LT_NO_LOCALE) {

invalid_comma_and_underscore();

return 0;

}

format->thousands_separators = LT_UNDERSCORE_LOCALE;

++pos;

}

if (end-pos && READ_spec(pos) == ',') {

invalid_comma_and_underscore();

return 0;

}

/* Parse field precision */

if (end-pos && READ_spec(pos) == '.') {

++pos;

consumed = get_integer(format_spec, &pos, end, &format->precision);

if (consumed == -1)

/* Overflow error. Exception already set. */

return 0;

/* Not having a precision after a dot is an error. */

if (consumed == 0) {

PyErr_Format(PyExc_ValueError,

"Format specifier missing precision");

return 0;

}

/* Finally, parse the type field. */

if (end-pos > 1) {

/* More than one char remain, invalid format specifier. */

PyErr_Format(PyExc_ValueError, "Invalid format specifier");

return 0;

}

if (end-pos == 1) {

format->type = READ_spec(pos);

++pos;

}

/* Do as much validating as we can, just by looking at the format

specifier. Do not take into account what type of formatting

we're doing (int, float, string). */

if (format->thousands_separators) {

switch (format->type) {

case 'd':

case 'e':

case 'f':

case 'g':

case 'E':

case 'G':

case '%':

case 'F':

case '\0':

/* These are allowed. See PEP 378.*/

break;

case 'b':

case 'o':

case 'x':

case 'X':

/* Underscores are allowed in bin/oct/hex. See PEP 515. */

if (format->thousands_separators == LT_UNDERSCORE_LOCALE) {

/* Every four digits, not every three, in bin/oct/hex. */

format->thousands_separators = LT_UNDER_FOUR_LOCALE;

break;

}

/* fall through */

default:

invalid_comma_type(format->type);

return 0;

}

assert (format->align <= 127);

assert (format->sign <= 127);

return 1;

}

/* Calculate the padding needed. */

static void

calc_padding(Py_ssize_t nchars, Py_ssize_t width, Py_UCS4 align,

Py_ssize_t *n_lpadding, Py_ssize_t *n_rpadding,

Py_ssize_t *n_total)

{

if (width >= 0) {

if (nchars > width)

*n_total = nchars;

else

*n_total = width;

}

else {

/* not specified, use all of the chars and no more */

*n_total = nchars;

}

/* Figure out how much leading space we need, based on the

aligning */

if (align == '>')

*n_lpadding = *n_total - nchars;

else if (align == '^')

*n_lpadding = (*n_total - nchars) / 2;

else if (align == '<' || align == '=')

*n_lpadding = 0;

else {

/* We should never have an unspecified alignment. */

Py_UNREACHABLE();

}

*n_rpadding = *n_total - nchars - *n_lpadding;

}

/* Do the padding, and return a pointer to where the caller-supplied

content goes. */

static int

fill_padding(_PyUnicodeWriter *writer,

Py_ssize_t nchars,

Py_UCS4 fill_char, Py_ssize_t n_lpadding,

Py_ssize_t n_rpadding)

{

Py_ssize_t pos;

/* Pad on left. */

if (n_lpadding) {

pos = writer->pos;

_PyUnicode_FastFill(writer->buffer, pos, n_lpadding, fill_char);

}

/* Pad on right. */

if (n_rpadding) {

pos = writer->pos + nchars + n_lpadding;

_PyUnicode_FastFill(writer->buffer, pos, n_rpadding, fill_char);

}

/* Pointer to the user content. */

writer->pos += n_lpadding;

return 0;

}

/************************************************************************/

/*********** common routines for numeric formatting *********************/

/************************************************************************/

/* Locale info needed for formatting integers and the part of floats

before and including the decimal. Note that locales only support

8-bit chars, not unicode. */

typedef struct {

PyObject *decimal_point;

PyObject *thousands_sep;

const char *grouping;

} LocaleInfo;

#define STATIC_LOCALE_INFO_INIT {0, 0, 0}

/* describes the layout for an integer, see the comment in

calc_number_widths() for details */

typedef struct {

Py_ssize_t n_lpadding;

Py_ssize_t n_prefix;

Py_ssize_t n_spadding;

Py_ssize_t n_rpadding;

char sign;

Py_ssize_t n_sign; /* number of digits needed for sign (0/1) */

Py_ssize_t n_grouped_digits; /* Space taken up by the digits, including

any grouping chars. */

Py_ssize_t n_decimal; /* 0 if only an integer */

Py_ssize_t n_remainder; /* Digits in decimal and/or exponent part,

excluding the decimal itself, if

present. */

/* These 2 are not the widths of fields, but are needed by

STRINGLIB_GROUPING. */

Py_ssize_t n_digits; /* The number of digits before a decimal

or exponent. */

Py_ssize_t n_min_width; /* The min_width we used when we computed

the n_grouped_digits width. */

} NumberFieldWidths;

/* Given a number of the form:

digits[remainder]

where ptr points to the start and end points to the end, find where

the integer part ends. This could be a decimal, an exponent, both,

or neither.

If a decimal point is present, set *has_decimal and increment

remainder beyond it.

Results are undefined (but shouldn't crash) for improperly

formatted strings.

static void

parse_number(PyObject *s, Py_ssize_t pos, Py_ssize_t end,

Py_ssize_t *n_remainder, int *has_decimal)

{

Py_ssize_t remainder;

int kind = PyUnicode_KIND(s);

void *data = PyUnicode_DATA(s);

while (pos<end && Py_ISDIGIT(PyUnicode_READ(kind, data, pos)))

++pos;

remainder = pos;

/* Does remainder start with a decimal point? */

*has_decimal = pos<end && PyUnicode_READ(kind, data, remainder) == '.';

/* Skip the decimal point. */

if (*has_decimal)

remainder++;

*n_remainder = end - remainder;

}

/* not all fields of format are used. for example, precision is

unused. should this take discrete params in order to be more clear

about what it does? or is passing a single format parameter easier

and more efficient enough to justify a little obfuscation? */

static Py_ssize_t

calc_number_widths(NumberFieldWidths *spec, Py_ssize_t n_prefix,

Py_UCS4 sign_char, PyObject *number, Py_ssize_t n_start,

Py_ssize_t n_end, Py_ssize_t n_remainder,

int has_decimal, const LocaleInfo *locale,

const InternalFormatSpec *format, Py_UCS4 *maxchar)

{

Py_ssize_t n_non_digit_non_padding;

Py_ssize_t n_padding;

spec->n_digits = n_end - n_start - n_remainder - (has_decimal?1:0);

spec->n_lpadding = 0;

spec->n_prefix = n_prefix;

spec->n_decimal = has_decimal ? PyUnicode_GET_LENGTH(locale->decimal_point) : 0;

spec->n_remainder = n_remainder;

spec->n_spadding = 0;

spec->n_rpadding = 0;

spec->sign = '\0';

spec->n_sign = 0;

/* the output will look like:

| |

| <lpadding> <sign> <prefix> <spadding> <grouped_digits> <decimal> <remainder> <rpadding> |

| |

sign is computed from format->sign and the actual

sign of the number

prefix is given (it's for the '0x' prefix)

digits is already known

the total width is either given, or computed from the

actual digits

only one of lpadding, spadding, and rpadding can be non-zero,

and it's calculated from the width and other fields

/* compute the various parts we're going to write */

switch (format->sign) {

case '+':

/* always put a + or - */

spec->n_sign = 1;

spec->sign = (sign_char == '-' ? '-' : '+');

break;

case ' ':

spec->n_sign = 1;

spec->sign = (sign_char == '-' ? '-' : ' ');

break;

default:

/* Not specified, or the default (-) */

if (sign_char == '-') {

spec->n_sign = 1;

spec->sign = '-';

}

/* The number of chars used for non-digits and non-padding. */

n_non_digit_non_padding = spec->n_sign + spec->n_prefix + spec->n_decimal +

spec->n_remainder;

/* min_width can go negative, that's okay. format->width == -1 means

we don't care. */

if (format->fill_char == '0' && format->align == '=')

spec->n_min_width = format->width - n_non_digit_non_padding;

else

spec->n_min_width = 0;

if (spec->n_digits == 0)

/* This case only occurs when using 'c' formatting, we need

to special case it because the grouping code always wants

to have at least one character. */

spec->n_grouped_digits = 0;

else {

Py_UCS4 grouping_maxchar;

spec->n_grouped_digits = _PyUnicode_InsertThousandsGrouping(

NULL, 0,

0, NULL,

spec->n_digits, spec->n_min_width,

locale->grouping, locale->thousands_sep, &grouping_maxchar);

*maxchar = Py_MAX(*maxchar, grouping_maxchar);

}

/* Given the desired width and the total of digit and non-digit

space we consume, see if we need any padding. format->width can

be negative (meaning no padding), but this code still works in

that case. */

n_padding = format->width -

(n_non_digit_non_padding + spec->n_grouped_digits);

if (n_padding > 0) {

/* Some padding is needed. Determine if it's left, space, or right. */

switch (format->align) {

case '<':

spec->n_rpadding = n_padding;

break;

case '^':

spec->n_lpadding = n_padding / 2;

spec->n_rpadding = n_padding - spec->n_lpadding;

break;

case '=':

spec->n_spadding = n_padding;

break;

case '>':

spec->n_lpadding = n_padding;

break;

default:

/* Shouldn't get here, but treat it as '>' */

Py_UNREACHABLE();

}

if (spec->n_lpadding || spec->n_spadding || spec->n_rpadding)

*maxchar = Py_MAX(*maxchar, format->fill_char);

if (spec->n_decimal)

*maxchar = Py_MAX(*maxchar, PyUnicode_MAX_CHAR_VALUE(locale->decimal_point));

return spec->n_lpadding + spec->n_sign + spec->n_prefix +

spec->n_spadding + spec->n_grouped_digits + spec->n_decimal +

spec->n_remainder + spec->n_rpadding;

}

/* Fill in the digit parts of a numbers's string representation,

as determined in calc_number_widths().

Return -1 on error, or 0 on success. */

static int

fill_number(_PyUnicodeWriter *writer, const NumberFieldWidths *spec,

PyObject *digits, Py_ssize_t d_start, Py_ssize_t d_end,

PyObject *prefix, Py_ssize_t p_start,

Py_UCS4 fill_char,

LocaleInfo *locale, int toupper)

{

/* Used to keep track of digits, decimal, and remainder. */

Py_ssize_t d_pos = d_start;

const unsigned int kind = writer->kind;

const void *data = writer->data;

Py_ssize_t r;

if (spec->n_lpadding) {

_PyUnicode_FastFill(writer->buffer,

writer->pos, spec->n_lpadding, fill_char);

writer->pos += spec->n_lpadding;

}

if (spec->n_sign == 1) {

PyUnicode_WRITE(kind, data, writer->pos, spec->sign);

writer->pos++;

}

if (spec->n_prefix) {

_PyUnicode_FastCopyCharacters(writer->buffer, writer->pos,

prefix, p_start,

spec->n_prefix);

if (toupper) {

Py_ssize_t t;

for (t = 0; t < spec->n_prefix; t++) {

Py_UCS4 c = PyUnicode_READ(kind, data, writer->pos + t);

c = Py_TOUPPER(c);

assert (c <= 127);

PyUnicode_WRITE(kind, data, writer->pos + t, c);

}

writer->pos += spec->n_prefix;

}

if (spec->n_spadding) {

_PyUnicode_FastFill(writer->buffer,

writer->pos, spec->n_spadding, fill_char);

writer->pos += spec->n_spadding;

}

/* Only for type 'c' special case, it has no digits. */

if (spec->n_digits != 0) {

/* Fill the digits with InsertThousandsGrouping. */

char *pdigits;

if (PyUnicode_READY(digits))

return -1;

pdigits = PyUnicode_DATA(digits);

if (PyUnicode_KIND(digits) < kind) {

pdigits = _PyUnicode_AsKind(digits, kind);

if (pdigits == NULL)

return -1;

}

r = _PyUnicode_InsertThousandsGrouping(

writer->buffer, writer->pos,

spec->n_grouped_digits,

pdigits + kind * d_pos,

spec->n_digits, spec->n_min_width,

locale->grouping, locale->thousands_sep, NULL);

if (r == -1)

return -1;

assert(r == spec->n_grouped_digits);

if (PyUnicode_KIND(digits) < kind)

PyMem_Free(pdigits);

d_pos += spec->n_digits;

}

if (toupper) {

Py_ssize_t t;

for (t = 0; t < spec->n_grouped_digits; t++) {

Py_UCS4 c = PyUnicode_READ(kind, data, writer->pos + t);

c = Py_TOUPPER(c);

if (c > 127) {

PyErr_SetString(PyExc_SystemError, "non-ascii grouped digit");

return -1;

}

PyUnicode_WRITE(kind, data, writer->pos + t, c);

}

writer->pos += spec->n_grouped_digits;

if (spec->n_decimal) {

_PyUnicode_FastCopyCharacters(

writer->buffer, writer->pos,

locale->decimal_point, 0, spec->n_decimal);

writer->pos += spec->n_decimal;

d_pos += 1;

}

if (spec->n_remainder) {

_PyUnicode_FastCopyCharacters(

writer->buffer, writer->pos,

digits, d_pos, spec->n_remainder);

writer->pos += spec->n_remainder;

/* d_pos += spec->n_remainder; */

}

if (spec->n_rpadding) {

_PyUnicode_FastFill(writer->buffer,

writer->pos, spec->n_rpadding,

fill_char);

writer->pos += spec->n_rpadding;

}

return 0;

}

static const char no_grouping[1] = {CHAR_MAX};

/* Find the decimal point character(s?), thousands_separator(s?), and

grouping description, either for the current locale if type is

LT_CURRENT_LOCALE, a hard-coded locale if LT_DEFAULT_LOCALE or

LT_UNDERSCORE_LOCALE/LT_UNDER_FOUR_LOCALE, or none if LT_NO_LOCALE. */

static int

get_locale_info(enum LocaleType type, LocaleInfo *locale_info)

{

switch (type) {

case LT_CURRENT_LOCALE: {

if (_Py_GetLocaleconvNumeric(&locale_info->decimal_point,

&locale_info->thousands_sep,

&locale_info->grouping) < 0) {

return -1;

}

break;

}

case LT_DEFAULT_LOCALE:

case LT_UNDERSCORE_LOCALE:

case LT_UNDER_FOUR_LOCALE:

locale_info->decimal_point = PyUnicode_FromOrdinal('.');

locale_info->thousands_sep = PyUnicode_FromOrdinal(

type == LT_DEFAULT_LOCALE ? ',' : '_');

if (!locale_info->decimal_point || !locale_info->thousands_sep)

return -1;

if (type != LT_UNDER_FOUR_LOCALE)

locale_info->grouping = "\3"; /* Group every 3 characters. The

(implicit) trailing 0 means repeat

infinitely. */

else

locale_info->grouping = "\4"; /* Bin/oct/hex group every four. */

break;

case LT_NO_LOCALE:

locale_info->decimal_point = PyUnicode_FromOrdinal('.');

locale_info->thousands_sep = PyUnicode_New(0, 0);

if (!locale_info->decimal_point || !locale_info->thousands_sep)

return -1;

locale_info->grouping = no_grouping;

break;

}

return 0;

}

static void

free_locale_info(LocaleInfo *locale_info)

{

Py_XDECREF(locale_info->decimal_point);

Py_XDECREF(locale_info->thousands_sep);

}

/************************************************************************/

/*********** string formatting ******************************************/

/************************************************************************/

static int

format_string_internal(PyObject *value, const InternalFormatSpec *format,

_PyUnicodeWriter *writer)

{

Py_ssize_t lpad;

Py_ssize_t rpad;

Py_ssize_t total;

Py_ssize_t len;

int result = -1;

Py_UCS4 maxchar;

assert(PyUnicode_IS_READY(value));

len = PyUnicode_GET_LENGTH(value);

/* sign is not allowed on strings */

if (format->sign != '\0') {

PyErr_SetString(PyExc_ValueError,

"Sign not allowed in string format specifier");

goto done;

}

/* alternate is not allowed on strings */

if (format->alternate) {

PyErr_SetString(PyExc_ValueError,

"Alternate form (#) not allowed in string format "

"specifier");

goto done;

}

/* '=' alignment not allowed on strings */

if (format->align == '=') {

PyErr_SetString(PyExc_ValueError,

"'=' alignment not allowed "

"in string format specifier");

goto done;

}

if ((format->width == -1 || format->width <= len)

&& (format->precision == -1 || format->precision >= len)) {

/* Fast path */

return _PyUnicodeWriter_WriteStr(writer, value);

}

/* if precision is specified, output no more that format.precision

characters */

if (format->precision >= 0 && len >= format->precision) {

len = format->precision;

}

calc_padding(len, format->width, format->align, &lpad, &rpad, &total);

maxchar = writer->maxchar;

if (lpad != 0 || rpad != 0)

maxchar = Py_MAX(maxchar, format->fill_char);

if (PyUnicode_MAX_CHAR_VALUE(value) > maxchar) {

Py_UCS4 valmaxchar = _PyUnicode_FindMaxChar(value, 0, len);

maxchar = Py_MAX(maxchar, valmaxchar);

}

/* allocate the resulting string */

if (_PyUnicodeWriter_Prepare(writer, total, maxchar) == -1)

goto done;

/* Write into that space. First the padding. */

result = fill_padding(writer, len, format->fill_char, lpad, rpad);

if (result == -1)

goto done;

/* Then the source string. */

if (len) {

_PyUnicode_FastCopyCharacters(writer->buffer, writer->pos,

value, 0, len);

}

writer->pos += (len + rpad);

result = 0;

done:

return result;

}

/************************************************************************/

/*********** long formatting ********************************************/

/************************************************************************/

static int

format_long_internal(PyObject *value, const InternalFormatSpec *format,

_PyUnicodeWriter *writer)

{

int result = -1;

Py_UCS4 maxchar = 127;

PyObject *tmp = NULL;

Py_ssize_t inumeric_chars;

Py_UCS4 sign_char = '\0';

Py_ssize_t n_digits; /* count of digits need from the computed

string */

Py_ssize_t n_remainder = 0; /* Used only for 'c' formatting, which

produces non-digits */

Py_ssize_t n_prefix = 0; /* Count of prefix chars, (e.g., '0x') */

Py_ssize_t n_total;

Py_ssize_t prefix = 0;

NumberFieldWidths spec;

long x;

/* Locale settings, either from the actual locale or

from a hard-code pseudo-locale */

LocaleInfo locale = STATIC_LOCALE_INFO_INIT;

/* no precision allowed on integers */

if (format->precision != -1) {

PyErr_SetString(PyExc_ValueError,

"Precision not allowed in integer format specifier");

goto done;

}

/* special case for character formatting */

if (format->type == 'c') {

/* error to specify a sign */

if (format->sign != '\0') {

PyErr_SetString(PyExc_ValueError,

"Sign not allowed with integer"

" format specifier 'c'");

goto done;

}

/* error to request alternate format */

if (format->alternate) {

PyErr_SetString(PyExc_ValueError,

"Alternate form (#) not allowed with integer"

" format specifier 'c'");

goto done;

}

/* taken from unicodeobject.c formatchar() */

/* Integer input truncated to a character */

x = PyLong_AsLong(value);

if (x == -1 && PyErr_Occurred())

goto done;

if (x < 0 || x > 0x10ffff) {

PyErr_SetString(PyExc_OverflowError,

"%c arg not in range(0x110000)");

goto done;

}

tmp = PyUnicode_FromOrdinal(x);

inumeric_chars = 0;

n_digits = 1;

maxchar = Py_MAX(maxchar, (Py_UCS4)x);

/* As a sort-of hack, we tell calc_number_widths that we only

have "remainder" characters. calc_number_widths thinks

these are characters that don't get formatted, only copied

into the output string. We do this for 'c' formatting,

because the characters are likely to be non-digits. */

n_remainder = 1;

}

else {

int base;

int leading_chars_to_skip = 0; /* Number of characters added by

PyNumber_ToBase that we want to

skip over. */

/* Compute the base and how many characters will be added by

PyNumber_ToBase */

switch (format->type) {

case 'b':

base = 2;

leading_chars_to_skip = 2; /* 0b */

break;

case 'o':

base = 8;

leading_chars_to_skip = 2; /* 0o */

break;

case 'x':

case 'X':

base = 16;

leading_chars_to_skip = 2; /* 0x */

break;

default: /* shouldn't be needed, but stops a compiler warning */

case 'd':

case 'n':

base = 10;

break;

}

if (format->sign != '+' && format->sign != ' '

&& format->width == -1

&& format->type != 'X' && format->type != 'n'

&& !format->thousands_separators

&& PyLong_CheckExact(value))

{

/* Fast path */

return _PyLong_FormatWriter(writer, value, base, format->alternate);

}

/* The number of prefix chars is the same as the leading

chars to skip */

if (format->alternate)

n_prefix = leading_chars_to_skip;

/* Do the hard part, converting to a string in a given base */

tmp = _PyLong_Format(value, base);

if (tmp == NULL || PyUnicode_READY(tmp) == -1)

goto done;

inumeric_chars = 0;

n_digits = PyUnicode_GET_LENGTH(tmp);

prefix = inumeric_chars;

/* Is a sign character present in the output? If so, remember it

and skip it */

if (PyUnicode_READ_CHAR(tmp, inumeric_chars) == '-') {

sign_char = '-';

++prefix;

++leading_chars_to_skip;

}

/* Skip over the leading chars (0x, 0b, etc.) */

n_digits -= leading_chars_to_skip;

inumeric_chars += leading_chars_to_skip;

}

/* Determine the grouping, separator, and decimal point, if any. */

if (get_locale_info(format->type == 'n' ? LT_CURRENT_LOCALE :

format->thousands_separators,

&locale) == -1)

goto done;

/* Calculate how much memory we'll need. */

n_total = calc_number_widths(&spec, n_prefix, sign_char, tmp, inumeric_chars,

inumeric_chars + n_digits, n_remainder, 0,

&locale, format, &maxchar);

/* Allocate the memory. */

if (_PyUnicodeWriter_Prepare(writer, n_total, maxchar) == -1)

goto done;

/* Populate the memory. */

result = fill_number(writer, &spec,

tmp, inumeric_chars, inumeric_chars + n_digits,

tmp, prefix, format->fill_char,

&locale, format->type == 'X');

done:

Py_XDECREF(tmp);

free_locale_info(&locale);

return result;

}

/************************************************************************/

/*********** float formatting *******************************************/

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cpython/Python/formatter_unicode.c at pythoncapi · pythoncapi/cpython · GitHub

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