Stowage/cpython
2
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-11-03 15:11:34 +00:00
Code Issues Projects Releases Packages Wiki Activity
cpython/Objects/stringlib/formatter.h

1518 lines
46 KiB
C
Raw Blame History

/* implements the string, long, and float formatters. that is,
string.__format__, etc. */
#include <locale.h>
/* Before including this, you must include either:
stringlib/unicodedefs.h
stringlib/stringdefs.h
Also, you should define the names:
FORMAT_STRING
FORMAT_LONG
FORMAT_FLOAT
FORMAT_COMPLEX
to be whatever you want the public names of these functions to
be. These are the only non-static functions defined here.
*/
/* Raises an exception about an unknown presentation type for this
* type. */
static void
unknown_presentation_type(STRINGLIB_CHAR presentation_type,
const char* type_name)
{
#if STRINGLIB_IS_UNICODE
/* If STRINGLIB_CHAR is Py_UNICODE, %c might be out-of-range,
hence the two cases. If it is char, gcc complains that the
condition below is always true, hence the ifdef. */
if (presentation_type > 32 && presentation_type < 128)
#endif
PyErr_Format(PyExc_ValueError,
"Unknown format code '%c' "
"for object of type '%.200s'",
(char)presentation_type,
type_name);
#if STRINGLIB_IS_UNICODE
else
PyErr_Format(PyExc_ValueError,
"Unknown format code '\\x%x' "
"for object of type '%.200s'",
(unsigned int)presentation_type,
type_name);
#endif
}
static void
invalid_comma_type(STRINGLIB_CHAR presentation_type)
{
#if STRINGLIB_IS_UNICODE
/* See comment in unknown_presentation_type */
if (presentation_type > 32 && presentation_type < 128)
#endif
PyErr_Format(PyExc_ValueError,
"Cannot specify ',' with '%c'.",
(char)presentation_type);
#if STRINGLIB_IS_UNICODE
else
PyErr_Format(PyExc_ValueError,
"Cannot specify ',' with '\\x%x'.",
(unsigned int)presentation_type);
#endif
}
/*
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(STRINGLIB_CHAR **ptr, STRINGLIB_CHAR *end,
Py_ssize_t *result)
{
Py_ssize_t accumulator, digitval, oldaccumulator;
int numdigits;
accumulator = numdigits = 0;
for (;;(*ptr)++, numdigits++) {
if (*ptr >= end)
break;
digitval = STRINGLIB_TODECIMAL(**ptr);
if (digitval < 0)
break;
/*
This trick was copied from old Unicode format code. It's cute,
but would really suck on an old machine with a slow divide
implementation. Fortunately, in the normal case we do not
expect too many digits.
*/
oldaccumulator = accumulator;
accumulator *= 10;
if ((accumulator+10)/10 != oldaccumulator+1) {
PyErr_Format(PyExc_ValueError,
"Too many decimal digits in format string");
return -1;
}
accumulator += digitval;
}
*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(STRINGLIB_CHAR 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(STRINGLIB_CHAR c)
{
switch (c) {
case ' ': case '+': case '-':
return 1;
default:
return 0;
}
}
typedef struct {
STRINGLIB_CHAR fill_char;
STRINGLIB_CHAR align;
int alternate;
STRINGLIB_CHAR sign;
Py_ssize_t width;
int thousands_separators;
Py_ssize_t precision;
STRINGLIB_CHAR type;
} InternalFormatSpec;
#if 0
/* Occassionally 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(STRINGLIB_CHAR *format_spec,
Py_ssize_t format_spec_len,
InternalFormatSpec *format,
char default_type,
char default_align)
{
STRINGLIB_CHAR *ptr = format_spec;
STRINGLIB_CHAR *end = format_spec + format_spec_len;
/* end-ptr is used throughout this code to specify the length of
the input string */
Py_ssize_t consumed;
int align_specified = 0;
format->fill_char = '\0';
format->align = default_align;
format->alternate = 0;
format->sign = '\0';
format->width = -1;
format->thousands_separators = 0;
format->precision = -1;
format->type = default_type;
/* If the second char is an alignment token,
then parse the fill char */
if (end-ptr >= 2 && is_alignment_token(ptr[1])) {
format->align = ptr[1];
format->fill_char = ptr[0];
align_specified = 1;
ptr += 2;
}
else if (end-ptr >= 1 && is_alignment_token(ptr[0])) {
format->align = ptr[0];
align_specified = 1;
++ptr;
}
/* Parse the various sign options */
if (end-ptr >= 1 && is_sign_element(ptr[0])) {
format->sign = ptr[0];
++ptr;
}
/* If the next character is #, we're in alternate mode. This only
applies to integers. */
if (end-ptr >= 1 && ptr[0] == '#') {
format->alternate = 1;
++ptr;
}
/* The special case for 0-padding (backwards compat) */
if (format->fill_char == '\0' && end-ptr >= 1 && ptr[0] == '0') {
format->fill_char = '0';
if (!align_specified) {
format->align = '=';
}
++ptr;
}
consumed = get_integer(&ptr, 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-ptr && ptr[0] == ',') {
format->thousands_separators = 1;
++ptr;
}
/* Parse field precision */
if (end-ptr && ptr[0] == '.') {
++ptr;
consumed = get_integer(&ptr, 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-ptr > 1) {
/* More than one char remain, invalid conversion spec. */
PyErr_Format(PyExc_ValueError, "Invalid conversion specification");
return 0;
}
if (end-ptr == 1) {
format->type = ptr[0];
++ptr;
}
/* 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;
default:
invalid_comma_type(format->type);
return 0;
}
}
return 1;
}
/* Calculate the padding needed. */
static void
calc_padding(Py_ssize_t nchars, Py_ssize_t width, STRINGLIB_CHAR 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. */
*n_lpadding = 0;
assert(0);
}
*n_rpadding = *n_total - nchars - *n_lpadding;
}
/* Do the padding, and return a pointer to where the caller-supplied
content goes. */
static STRINGLIB_CHAR *
fill_padding(STRINGLIB_CHAR *p, Py_ssize_t nchars, STRINGLIB_CHAR fill_char,
Py_ssize_t n_lpadding, Py_ssize_t n_rpadding)
{
/* Pad on left. */
if (n_lpadding)
STRINGLIB_FILL(p, fill_char, n_lpadding);
/* Pad on right. */
if (n_rpadding)
STRINGLIB_FILL(p + nchars + n_lpadding, fill_char, n_rpadding);
/* Pointer to the user content. */
return p + n_lpadding;
}
#if defined FORMAT_FLOAT || defined FORMAT_LONG || defined FORMAT_COMPLEX
/************************************************************************/
/*********** common routines for numeric formatting *********************/
/************************************************************************/
/* Locale type codes. */
#define LT_CURRENT_LOCALE 0
#define LT_DEFAULT_LOCALE 1
#define LT_NO_LOCALE 2
/* 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 {
char *decimal_point;
char *thousands_sep;
char *grouping;
} LocaleInfo;
/* 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(STRINGLIB_CHAR *ptr, Py_ssize_t len,
Py_ssize_t *n_remainder, int *has_decimal)
{
STRINGLIB_CHAR *end = ptr + len;
STRINGLIB_CHAR *remainder;
while (ptr<end && isdigit(*ptr))
++ptr;
remainder = ptr;
/* Does remainder start with a decimal point? */
*has_decimal = ptr<end && *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,
STRINGLIB_CHAR sign_char, STRINGLIB_CHAR *number,
Py_ssize_t n_number, Py_ssize_t n_remainder,
int has_decimal, const LocaleInfo *locale,
const InternalFormatSpec *format)
{
Py_ssize_t n_non_digit_non_padding;
Py_ssize_t n_padding;
spec->n_digits = n_number - n_remainder - (has_decimal?1:0);
spec->n_lpadding = 0;
spec->n_prefix = n_prefix;
spec->n_decimal = has_decimal ? strlen(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
spec->n_grouped_digits = STRINGLIB_GROUPING(NULL, 0, NULL,
spec->n_digits,
spec->n_min_width,
locale->grouping,
locale->thousands_sep);
/* 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 '>' */
spec->n_lpadding = n_padding;
assert(0);
break;
}
}
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().
No error checking, since we know the buffer is the correct size. */
static void
fill_number(STRINGLIB_CHAR *buf, const NumberFieldWidths *spec,
STRINGLIB_CHAR *digits, Py_ssize_t n_digits,
STRINGLIB_CHAR *prefix, STRINGLIB_CHAR fill_char,
LocaleInfo *locale, int toupper)
{
/* Used to keep track of digits, decimal, and remainder. */
STRINGLIB_CHAR *p = digits;
#ifndef NDEBUG
Py_ssize_t r;
#endif
if (spec->n_lpadding) {
STRINGLIB_FILL(buf, fill_char, spec->n_lpadding);
buf += spec->n_lpadding;
}
if (spec->n_sign == 1) {
*buf++ = spec->sign;
}
if (spec->n_prefix) {
memmove(buf,
prefix,
spec->n_prefix * sizeof(STRINGLIB_CHAR));
if (toupper) {
Py_ssize_t t;
for (t = 0; t < spec->n_prefix; ++t)
buf[t] = STRINGLIB_TOUPPER(buf[t]);
}
buf += spec->n_prefix;
}
if (spec->n_spadding) {
STRINGLIB_FILL(buf, fill_char, spec->n_spadding);
buf += spec->n_spadding;
}
/* Only for type 'c' special case, it has no digits. */
if (spec->n_digits != 0) {
/* Fill the digits with InsertThousandsGrouping. */
#ifndef NDEBUG
r =
#endif
STRINGLIB_GROUPING(buf, spec->n_grouped_digits, digits,
spec->n_digits, spec->n_min_width,
locale->grouping, locale->thousands_sep);
#ifndef NDEBUG
assert(r == spec->n_grouped_digits);
#endif
p += spec->n_digits;
}
if (toupper) {
Py_ssize_t t;
for (t = 0; t < spec->n_grouped_digits; ++t)
buf[t] = STRINGLIB_TOUPPER(buf[t]);
}
buf += spec->n_grouped_digits;
if (spec->n_decimal) {
Py_ssize_t t;
for (t = 0; t < spec->n_decimal; ++t)
buf[t] = locale->decimal_point[t];
buf += spec->n_decimal;
p += 1;
}
if (spec->n_remainder) {
memcpy(buf, p, spec->n_remainder * sizeof(STRINGLIB_CHAR));
buf += spec->n_remainder;
p += spec->n_remainder;
}
if (spec->n_rpadding) {
STRINGLIB_FILL(buf, fill_char, spec->n_rpadding);
buf += spec->n_rpadding;
}
}
static 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
none if LT_NO_LOCALE. */
static void
get_locale_info(int type, LocaleInfo *locale_info)
{
switch (type) {
case LT_CURRENT_LOCALE: {
struct lconv *locale_data = localeconv();
locale_info->decimal_point = locale_data->decimal_point;
locale_info->thousands_sep = locale_data->thousands_sep;
locale_info->grouping = locale_data->grouping;
break;
}
case LT_DEFAULT_LOCALE:
locale_info->decimal_point = ".";
locale_info->thousands_sep = ",";
locale_info->grouping = "\3"; /* Group every 3 characters. The
(implicit) trailing 0 means repeat
infinitely. */
break;
case LT_NO_LOCALE:
locale_info->decimal_point = ".";
locale_info->thousands_sep = "";
locale_info->grouping = no_grouping;
break;
default:
assert(0);
}
}
#endif /* FORMAT_FLOAT || FORMAT_LONG || FORMAT_COMPLEX */
/************************************************************************/
/*********** string formatting ******************************************/
/************************************************************************/
static PyObject *
format_string_internal(PyObject *value, const InternalFormatSpec *format)
{
Py_ssize_t lpad;
Py_ssize_t rpad;
Py_ssize_t total;
STRINGLIB_CHAR *p;
Py_ssize_t len = STRINGLIB_LEN(value);
PyObject *result = NULL;
/* 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 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);
/* allocate the resulting string */
result = STRINGLIB_NEW(NULL, total);
if (result == NULL)
goto done;
/* Write into that space. First the padding. */
p = fill_padding(STRINGLIB_STR(result), len,
format->fill_char=='\0'?' ':format->fill_char,
lpad, rpad);
/* Then the source string. */
memcpy(p, STRINGLIB_STR(value), len * sizeof(STRINGLIB_CHAR));
done:
return result;
}
/************************************************************************/
/*********** long formatting ********************************************/
/************************************************************************/
#if defined FORMAT_LONG || defined FORMAT_INT
typedef PyObject*
(*IntOrLongToString)(PyObject *value, int base);
static PyObject *
format_int_or_long_internal(PyObject *value, const InternalFormatSpec *format,
IntOrLongToString tostring)
{
PyObject *result = NULL;
PyObject *tmp = NULL;
STRINGLIB_CHAR *pnumeric_chars;
STRINGLIB_CHAR numeric_char;
STRINGLIB_CHAR 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;
STRINGLIB_CHAR *prefix = NULL;
NumberFieldWidths spec;
long x;
/* Locale settings, either from the actual locale or
from a hard-code pseudo-locale */
LocaleInfo locale;
/* 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;
}
/* taken from unicodeobject.c formatchar() */
/* Integer input truncated to a character */
/* XXX: won't work for int */
x = PyLong_AsLong(value);
if (x == -1 && PyErr_Occurred())
goto done;
#ifdef Py_UNICODE_WIDE
if (x < 0 || x > 0x10ffff) {
PyErr_SetString(PyExc_OverflowError,
"%c arg not in range(0x110000) "
"(wide Python build)");
goto done;
}
#else
if (x < 0 || x > 0xffff) {
PyErr_SetString(PyExc_OverflowError,
"%c arg not in range(0x10000) "
"(narrow Python build)");
goto done;
}
#endif
numeric_char = (STRINGLIB_CHAR)x;
pnumeric_chars = &numeric_char;
n_digits = 1;
/* 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;
}
/* 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 = tostring(value, base);
if (tmp == NULL)
goto done;
pnumeric_chars = STRINGLIB_STR(tmp);
n_digits = STRINGLIB_LEN(tmp);
prefix = pnumeric_chars;
/* Remember not to modify what pnumeric_chars points to. it
might be interned. Only modify it after we copy it into a
newly allocated output buffer. */
/* Is a sign character present in the output? If so, remember it
and skip it */
if (pnumeric_chars[0] == '-') {
sign_char = pnumeric_chars[0];
++prefix;
++leading_chars_to_skip;
}
/* Skip over the leading chars (0x, 0b, etc.) */
n_digits -= leading_chars_to_skip;
pnumeric_chars += leading_chars_to_skip;
}
/* Determine the grouping, separator, and decimal point, if any. */
get_locale_info(format->type == 'n' ? LT_CURRENT_LOCALE :
(format->thousands_separators ?
LT_DEFAULT_LOCALE :
LT_NO_LOCALE),
&locale);
/* Calculate how much memory we'll need. */
n_total = calc_number_widths(&spec, n_prefix, sign_char, pnumeric_chars,
n_digits, n_remainder, 0, &locale, format);
/* Allocate the memory. */
result = STRINGLIB_NEW(NULL, n_total);
if (!result)
goto done;
/* Populate the memory. */
fill_number(STRINGLIB_STR(result), &spec, pnumeric_chars, n_digits,
prefix, format->fill_char == '\0' ? ' ' : format->fill_char,
&locale, format->type == 'X');
done:
Py_XDECREF(tmp);
return result;
}
#endif /* defined FORMAT_LONG || defined FORMAT_INT */
/************************************************************************/
/*********** float formatting *******************************************/
/************************************************************************/
#ifdef FORMAT_FLOAT
#if STRINGLIB_IS_UNICODE
static void
strtounicode(Py_UNICODE *buffer, const char *charbuffer, Py_ssize_t len)
{
Py_ssize_t i;
for (i = 0; i < len; ++i)
buffer[i] = (Py_UNICODE)charbuffer[i];
}
#endif
/* much of this is taken from unicodeobject.c */
static PyObject *
format_float_internal(PyObject *value,
const InternalFormatSpec *format)
{
char *buf = NULL; /* buffer returned from PyOS_double_to_string */
Py_ssize_t n_digits;
Py_ssize_t n_remainder;
Py_ssize_t n_total;
int has_decimal;
double val;
Py_ssize_t precision = format->precision;
Py_ssize_t default_precision = 6;
STRINGLIB_CHAR type = format->type;
int add_pct = 0;
STRINGLIB_CHAR *p;
NumberFieldWidths spec;
int flags = 0;
PyObject *result = NULL;
STRINGLIB_CHAR sign_char = '\0';
int float_type; /* Used to see if we have a nan, inf, or regular float. */
#if STRINGLIB_IS_UNICODE
Py_UNICODE *unicode_tmp = NULL;
#endif
/* Locale settings, either from the actual locale or
from a hard-code pseudo-locale */
LocaleInfo locale;
if (format->alternate)
flags |= Py_DTSF_ALT;
if (type == '\0') {
/* Omitted type specifier. Behaves in the same way as repr(x)
and str(x) if no precision is given, else like 'g', but with
at least one digit after the decimal point. */
flags |= Py_DTSF_ADD_DOT_0;
type = 'r';
default_precision = 0;
}
if (type == 'n')
/* 'n' is the same as 'g', except for the locale used to
format the result. We take care of that later. */
type = 'g';
val = PyFloat_AsDouble(value);
if (val == -1.0 && PyErr_Occurred())
goto done;
if (type == '%') {
type = 'f';
val *= 100;
add_pct = 1;
}
if (precision < 0)
precision = default_precision;
else if (type == 'r')
type = 'g';
/* Cast "type", because if we're in unicode we need to pass a
8-bit char. This is safe, because we've restricted what "type"
can be. */
buf = PyOS_double_to_string(val, (char)type, precision, flags,
&float_type);
if (buf == NULL)
goto done;
n_digits = strlen(buf);
if (add_pct) {
/* We know that buf has a trailing zero (since we just called
strlen() on it), and we don't use that fact any more. So we
can just write over the trailing zero. */
buf[n_digits] = '%';
n_digits += 1;
}
/* Since there is no unicode version of PyOS_double_to_string,
just use the 8 bit version and then convert to unicode. */
#if STRINGLIB_IS_UNICODE
unicode_tmp = (Py_UNICODE*)PyMem_Malloc((n_digits)*sizeof(Py_UNICODE));
if (unicode_tmp == NULL) {
PyErr_NoMemory();
goto done;
}
strtounicode(unicode_tmp, buf, n_digits);
p = unicode_tmp;
#else
p = buf;
#endif
/* Is a sign character present in the output? If so, remember it
and skip it */
if (*p == '-') {
sign_char = *p;
++p;
--n_digits;
}
/* Determine if we have any "remainder" (after the digits, might include
decimal or exponent or both (or neither)) */
parse_number(p, n_digits, &n_remainder, &has_decimal);
/* Determine the grouping, separator, and decimal point, if any. */
get_locale_info(format->type == 'n' ? LT_CURRENT_LOCALE :
(format->thousands_separators ?
LT_DEFAULT_LOCALE :
LT_NO_LOCALE),
&locale);
/* Calculate how much memory we'll need. */
n_total = calc_number_widths(&spec, 0, sign_char, p, n_digits,
n_remainder, has_decimal, &locale, format);
/* Allocate the memory. */
result = STRINGLIB_NEW(NULL, n_total);
if (result == NULL)
goto done;
/* Populate the memory. */
fill_number(STRINGLIB_STR(result), &spec, p, n_digits, NULL,
format->fill_char == '\0' ? ' ' : format->fill_char, &locale,
0);
done:
PyMem_Free(buf);
#if STRINGLIB_IS_UNICODE
PyMem_Free(unicode_tmp);
#endif
return result;
}
#endif /* FORMAT_FLOAT */
/************************************************************************/
/*********** complex formatting *****************************************/
/************************************************************************/
#ifdef FORMAT_COMPLEX
static PyObject *
format_complex_internal(PyObject *value,
const InternalFormatSpec *format)
{
double re;
double im;
char *re_buf = NULL; /* buffer returned from PyOS_double_to_string */
char *im_buf = NULL; /* buffer returned from PyOS_double_to_string */
InternalFormatSpec tmp_format = *format;
Py_ssize_t n_re_digits;
Py_ssize_t n_im_digits;
Py_ssize_t n_re_remainder;
Py_ssize_t n_im_remainder;
Py_ssize_t n_re_total;
Py_ssize_t n_im_total;
int re_has_decimal;
int im_has_decimal;
Py_ssize_t precision = format->precision;
Py_ssize_t default_precision = 6;
STRINGLIB_CHAR type = format->type;
STRINGLIB_CHAR *p_re;
STRINGLIB_CHAR *p_im;
NumberFieldWidths re_spec;
NumberFieldWidths im_spec;
int flags = 0;
PyObject *result = NULL;
STRINGLIB_CHAR *p;
STRINGLIB_CHAR re_sign_char = '\0';
STRINGLIB_CHAR im_sign_char = '\0';
int re_float_type; /* Used to see if we have a nan, inf, or regular float. */
int im_float_type;
int add_parens = 0;
int skip_re = 0;
Py_ssize_t lpad;
Py_ssize_t rpad;
Py_ssize_t total;
#if STRINGLIB_IS_UNICODE
Py_UNICODE *re_unicode_tmp = NULL;
Py_UNICODE *im_unicode_tmp = NULL;
#endif
/* Locale settings, either from the actual locale or
from a hard-code pseudo-locale */
LocaleInfo locale;
/* Zero padding is not allowed. */
if (format->fill_char == '0') {
PyErr_SetString(PyExc_ValueError,
"Zero padding is not allowed in complex format "
"specifier");
goto done;
}
/* Neither is '=' alignment . */
if (format->align == '=') {
PyErr_SetString(PyExc_ValueError,
"'=' alignment flag is not allowed in complex format "
"specifier");
goto done;
}
re = PyComplex_RealAsDouble(value);
if (re == -1.0 && PyErr_Occurred())
goto done;
im = PyComplex_ImagAsDouble(value);
if (im == -1.0 && PyErr_Occurred())
goto done;
if (format->alternate)
flags |= Py_DTSF_ALT;
if (type == '\0') {
/* Omitted type specifier. Should be like str(self). */
type = 'r';
default_precision = 0;
if (re == 0.0 && copysign(1.0, re) == 1.0)
skip_re = 1;
else
add_parens = 1;
}
if (type == 'n')
/* 'n' is the same as 'g', except for the locale used to
format the result. We take care of that later. */
type = 'g';
if (precision < 0)
precision = default_precision;
else if (type == 'r')
type = 'g';
/* Cast "type", because if we're in unicode we need to pass a
8-bit char. This is safe, because we've restricted what "type"
can be. */
re_buf = PyOS_double_to_string(re, (char)type, precision, flags,
&re_float_type);
if (re_buf == NULL)
goto done;
im_buf = PyOS_double_to_string(im, (char)type, precision, flags,
&im_float_type);
if (im_buf == NULL)
goto done;
n_re_digits = strlen(re_buf);
n_im_digits = strlen(im_buf);
/* Since there is no unicode version of PyOS_double_to_string,
just use the 8 bit version and then convert to unicode. */
#if STRINGLIB_IS_UNICODE
re_unicode_tmp = (Py_UNICODE*)PyMem_Malloc((n_re_digits)*sizeof(Py_UNICODE));
if (re_unicode_tmp == NULL) {
PyErr_NoMemory();
goto done;
}
strtounicode(re_unicode_tmp, re_buf, n_re_digits);
p_re = re_unicode_tmp;
im_unicode_tmp = (Py_UNICODE*)PyMem_Malloc((n_im_digits)*sizeof(Py_UNICODE));
if (im_unicode_tmp == NULL) {
PyErr_NoMemory();
goto done;
}
strtounicode(im_unicode_tmp, im_buf, n_im_digits);
p_im = im_unicode_tmp;
#else
p_re = re_buf;
p_im = im_buf;
#endif
/* Is a sign character present in the output? If so, remember it
and skip it */
if (*p_re == '-') {
re_sign_char = *p_re;
++p_re;
--n_re_digits;
}
if (*p_im == '-') {
im_sign_char = *p_im;
++p_im;
--n_im_digits;
}
/* Determine if we have any "remainder" (after the digits, might include
decimal or exponent or both (or neither)) */
parse_number(p_re, n_re_digits, &n_re_remainder, &re_has_decimal);
parse_number(p_im, n_im_digits, &n_im_remainder, &im_has_decimal);
/* Determine the grouping, separator, and decimal point, if any. */
get_locale_info(format->type == 'n' ? LT_CURRENT_LOCALE :
(format->thousands_separators ?
LT_DEFAULT_LOCALE :
LT_NO_LOCALE),
&locale);
/* Turn off any padding. We'll do it later after we've composed
the numbers without padding. */
tmp_format.fill_char = '\0';
tmp_format.align = '<';
tmp_format.width = -1;
/* Calculate how much memory we'll need. */
n_re_total = calc_number_widths(&re_spec, 0, re_sign_char, p_re,
n_re_digits, n_re_remainder,
re_has_decimal, &locale, &tmp_format);
/* Same formatting, but always include a sign, unless the real part is
* going to be omitted, in which case we use whatever sign convention was
* requested by the original format. */
if (!skip_re)
tmp_format.sign = '+';
n_im_total = calc_number_widths(&im_spec, 0, im_sign_char, p_im,
n_im_digits, n_im_remainder,
im_has_decimal, &locale, &tmp_format);
if (skip_re)
n_re_total = 0;
/* Add 1 for the 'j', and optionally 2 for parens. */
calc_padding(n_re_total + n_im_total + 1 + add_parens * 2,
format->width, format->align, &lpad, &rpad, &total);
result = STRINGLIB_NEW(NULL, total);
if (result == NULL)
goto done;
/* Populate the memory. First, the padding. */
p = fill_padding(STRINGLIB_STR(result),
n_re_total + n_im_total + 1 + add_parens * 2,
format->fill_char=='\0' ? ' ' : format->fill_char,
lpad, rpad);
if (add_parens)
*p++ = '(';
if (!skip_re) {
fill_number(p, &re_spec, p_re, n_re_digits, NULL, 0, &locale, 0);
p += n_re_total;
}
fill_number(p, &im_spec, p_im, n_im_digits, NULL, 0, &locale, 0);
p += n_im_total;
*p++ = 'j';
if (add_parens)
*p++ = ')';
done:
PyMem_Free(re_buf);
PyMem_Free(im_buf);
#if STRINGLIB_IS_UNICODE
PyMem_Free(re_unicode_tmp);
PyMem_Free(im_unicode_tmp);
#endif
return result;
}
#endif /* FORMAT_COMPLEX */
/************************************************************************/
/*********** built in formatters ****************************************/
/************************************************************************/
PyObject *
FORMAT_STRING(PyObject *obj,
STRINGLIB_CHAR *format_spec,
Py_ssize_t format_spec_len)
{
InternalFormatSpec format;
PyObject *result = NULL;
/* check for the special case of zero length format spec, make
it equivalent to str(obj) */
if (format_spec_len == 0) {
result = STRINGLIB_TOSTR(obj);
goto done;
}
/* parse the format_spec */
if (!parse_internal_render_format_spec(format_spec, format_spec_len,
&format, 's', '<'))
goto done;
/* type conversion? */
switch (format.type) {
case 's':
/* no type conversion needed, already a string. do the formatting */
result = format_string_internal(obj, &format);
break;
default:
/* unknown */
unknown_presentation_type(format.type, obj->ob_type->tp_name);
goto done;
}
done:
return result;
}
#if defined FORMAT_LONG || defined FORMAT_INT
static PyObject*
format_int_or_long(PyObject* obj,
STRINGLIB_CHAR *format_spec,
Py_ssize_t format_spec_len,
IntOrLongToString tostring)
{
PyObject *result = NULL;
PyObject *tmp = NULL;
InternalFormatSpec format;
/* check for the special case of zero length format spec, make
it equivalent to str(obj) */
if (format_spec_len == 0) {
result = STRINGLIB_TOSTR(obj);
goto done;
}
/* parse the format_spec */
if (!parse_internal_render_format_spec(format_spec,
format_spec_len,
&format, 'd', '>'))
goto done;
/* type conversion? */
switch (format.type) {
case 'b':
case 'c':
case 'd':
case 'o':
case 'x':
case 'X':
case 'n':
/* no type conversion needed, already an int (or long). do
the formatting */
result = format_int_or_long_internal(obj, &format, tostring);
break;
case 'e':
case 'E':
case 'f':
case 'F':
case 'g':
case 'G':
case '%':
/* convert to float */
tmp = PyNumber_Float(obj);
if (tmp == NULL)
goto done;
result = format_float_internal(tmp, &format);
break;
default:
/* unknown */
unknown_presentation_type(format.type, obj->ob_type->tp_name);
goto done;
}
done:
Py_XDECREF(tmp);
return result;
}
#endif /* FORMAT_LONG || defined FORMAT_INT */
#ifdef FORMAT_LONG
/* Need to define long_format as a function that will convert a long
to a string. In 3.0, _PyLong_Format has the correct signature. In
2.x, we need to fudge a few parameters */
#if PY_VERSION_HEX >= 0x03000000
#define long_format _PyLong_Format
#else
static PyObject*
long_format(PyObject* value, int base)
{
/* Convert to base, don't add trailing 'L', and use the new octal
format. We already know this is a long object */
assert(PyLong_Check(value));
/* convert to base, don't add 'L', and use the new octal format */
return _PyLong_Format(value, base, 0, 1);
}
#endif
PyObject *
FORMAT_LONG(PyObject *obj,
STRINGLIB_CHAR *format_spec,
Py_ssize_t format_spec_len)
{
return format_int_or_long(obj, format_spec, format_spec_len,
long_format);
}
#endif /* FORMAT_LONG */
#ifdef FORMAT_INT
/* this is only used for 2.x, not 3.0 */
static PyObject*
int_format(PyObject* value, int base)
{
/* Convert to base, and use the new octal format. We already
know this is an int object */
assert(PyInt_Check(value));
return _PyInt_Format((PyIntObject*)value, base, 1);
}
PyObject *
FORMAT_INT(PyObject *obj,
STRINGLIB_CHAR *format_spec,
Py_ssize_t format_spec_len)
{
return format_int_or_long(obj, format_spec, format_spec_len,
int_format);
}
#endif /* FORMAT_INT */
#ifdef FORMAT_FLOAT
PyObject *
FORMAT_FLOAT(PyObject *obj,
STRINGLIB_CHAR *format_spec,
Py_ssize_t format_spec_len)
{
PyObject *result = NULL;
InternalFormatSpec format;
/* check for the special case of zero length format spec, make
it equivalent to str(obj) */
if (format_spec_len == 0) {
result = STRINGLIB_TOSTR(obj);
goto done;
}
/* parse the format_spec */
if (!parse_internal_render_format_spec(format_spec,
format_spec_len,
&format, '\0', '>'))
goto done;
/* type conversion? */
switch (format.type) {
case '\0': /* No format code: like 'g', but with at least one decimal. */
case 'e':
case 'E':
case 'f':
case 'F':
case 'g':
case 'G':
case 'n':
case '%':
/* no conversion, already a float. do the formatting */
result = format_float_internal(obj, &format);
break;
default:
/* unknown */
unknown_presentation_type(format.type, obj->ob_type->tp_name);
goto done;
}
done:
return result;
}
#endif /* FORMAT_FLOAT */
#ifdef FORMAT_COMPLEX
PyObject *
FORMAT_COMPLEX(PyObject *obj,
STRINGLIB_CHAR *format_spec,
Py_ssize_t format_spec_len)
{
PyObject *result = NULL;
InternalFormatSpec format;
/* check for the special case of zero length format spec, make
it equivalent to str(obj) */
if (format_spec_len == 0) {
result = STRINGLIB_TOSTR(obj);
goto done;
}
/* parse the format_spec */
if (!parse_internal_render_format_spec(format_spec,
format_spec_len,
&format, '\0', '>'))
goto done;
/* type conversion? */
switch (format.type) {
case '\0': /* No format code: like 'g', but with at least one decimal. */
case 'e':
case 'E':
case 'f':
case 'F':
case 'g':
case 'G':
case 'n':
/* no conversion, already a complex. do the formatting */
result = format_complex_internal(obj, &format);
break;
default:
/* unknown */
unknown_presentation_type(format.type, obj->ob_type->tp_name);
goto done;
}
done:
return result;
}
#endif /* FORMAT_COMPLEX */
Reference in a new issue View git blame Copy permalink