diff options
Diffstat (limited to 'Objects/stringlib/formatter.h')
| -rw-r--r-- | Objects/stringlib/formatter.h | 966 |
1 files changed, 966 insertions, 0 deletions
diff --git a/Objects/stringlib/formatter.h b/Objects/stringlib/formatter.h new file mode 100644 index 0000000..b65244d --- /dev/null +++ b/Objects/stringlib/formatter.h @@ -0,0 +1,966 @@ +/* implements the string, long, and float formatters. that is, + string.__format__, etc. */ + +/* 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 + to be whatever you want the public names of these functions to + be. These are the only non-static functions defined here. +*/ + +/* + 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 '-': case '(': + return 1; + default: + return 0; + } +} + + +typedef struct { + STRINGLIB_CHAR fill_char; + STRINGLIB_CHAR align; + STRINGLIB_CHAR sign; + Py_ssize_t width; + Py_ssize_t precision; + STRINGLIB_CHAR type; +} InternalFormatSpec; + +/* + 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, + InternalFormatSpec *format, + char default_type) +{ + STRINGLIB_CHAR *ptr = STRINGLIB_STR(format_spec); + STRINGLIB_CHAR *end = ptr + STRINGLIB_LEN(format_spec); + + /* end-ptr is used throughout this code to specify the length of + the input string */ + + Py_ssize_t specified_width; + + format->fill_char = '\0'; + format->align = '\0'; + format->sign = '\0'; + format->width = -1; + 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]; + ptr += 2; + } else if (end-ptr >= 1 && is_alignment_token(ptr[0])) { + format->align = ptr[0]; + ptr++; + } + + /* Parse the various sign options */ + if (end-ptr >= 1 && is_sign_element(ptr[0])) { + format->sign = ptr[0]; + ptr++; + if (end-ptr >= 1 && ptr[0] == ')') { + 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 (format->align == '\0') { + format->align = '='; + } + ptr++; + } + + /* XXX add error checking */ + specified_width = get_integer(&ptr, end, &format->width); + + /* if specified_width 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 */ + if (specified_width == 0) { + format->width = -1; + } + + /* Parse field precision */ + if (end-ptr && ptr[0] == '.') { + ptr++; + + /* XXX add error checking */ + specified_width = get_integer(&ptr, end, &format->precision); + + /* not having a precision after a dot is an error */ + if (specified_width == 0) { + PyErr_Format(PyExc_ValueError, + "Format specifier missing precision"); + return 0; + } + + } + + /* Finally, parse the type field */ + + if (end-ptr > 1) { + /* invalid conversion spec */ + PyErr_Format(PyExc_ValueError, "Invalid conversion specification"); + return 0; + } + + if (end-ptr == 1) { + format->type = ptr[0]; + ptr++; + } + + return 1; +} + + +/************************************************************************/ +/*********** common routines for numeric formatting *********************/ +/************************************************************************/ + +/* describes the layout for an integer, see the comment in + _calc_integer_widths() for details */ +typedef struct { + Py_ssize_t n_lpadding; + Py_ssize_t n_spadding; + Py_ssize_t n_rpadding; + char lsign; + Py_ssize_t n_lsign; + char rsign; + Py_ssize_t n_rsign; + Py_ssize_t n_total; /* just a convenience, it's derivable from the + other fields */ +} NumberFieldWidths; + +/* 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 void +calc_number_widths(NumberFieldWidths *r, STRINGLIB_CHAR actual_sign, + Py_ssize_t n_digits, const InternalFormatSpec *format) +{ + r->n_lpadding = 0; + r->n_spadding = 0; + r->n_rpadding = 0; + r->lsign = '\0'; + r->n_lsign = 0; + r->rsign = '\0'; + r->n_rsign = 0; + + /* the output will look like: + | | + | <lpadding> <lsign> <spadding> <digits> <rsign> <rpadding> | + | | + + lsign and rsign are computed from format->sign and the actual + sign of the number + + 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 */ + if (format->sign == '+') { + /* always put a + or - */ + r->n_lsign = 1; + r->lsign = (actual_sign == '-' ? '-' : '+'); + } else if (format->sign == '(') { + if (actual_sign == '-') { + r->n_lsign = 1; + r->lsign = '('; + r->n_rsign = 1; + r->rsign = ')'; + } + } else if (format->sign == ' ') { + r->n_lsign = 1; + r->lsign = (actual_sign == '-' ? '-' : ' '); + } else { + /* non specified, or the default (-) */ + if (actual_sign == '-') { + r->n_lsign = 1; + r->lsign = '-'; + } + } + + /* now the number of padding characters */ + if (format->width == -1) { + /* no padding at all, nothing to do */ + } else { + /* see if any padding is needed */ + if (r->n_lsign + n_digits + r->n_rsign >= format->width) { + /* no padding needed, we're already bigger than the + requested width */ + } else { + /* determine which of left, space, or right padding is + needed */ + Py_ssize_t padding = format->width - (r->n_lsign + n_digits + r->n_rsign); + if (format->align == '<') + r->n_rpadding = padding; + else if (format->align == '>') + r->n_lpadding = padding; + else if (format->align == '^') { + r->n_lpadding = padding / 2; + r->n_rpadding = padding - r->n_lpadding; + } else + /* must be '=' */ + r->n_spadding = padding; + } + } + r->n_total = r->n_lpadding + r->n_lsign + r->n_spadding + + n_digits + r->n_rsign + r->n_rpadding; +} + +/* fill in the non-digit parts of a numbers's string representation, + as determined in _calc_integer_widths(). returns the pointer to + where the digits go. */ +static STRINGLIB_CHAR * +fill_number(STRINGLIB_CHAR *p_buf, const NumberFieldWidths *spec, + Py_ssize_t n_digits, STRINGLIB_CHAR fill_char) +{ + STRINGLIB_CHAR* p_digits; + + if (spec->n_lpadding) { + STRINGLIB_FILL(p_buf, fill_char, spec->n_lpadding); + p_buf += spec->n_lpadding; + } + if (spec->n_lsign == 1) { + *p_buf++ = spec->lsign; + } + if (spec->n_spadding) { + STRINGLIB_FILL(p_buf, fill_char, spec->n_spadding); + p_buf += spec->n_spadding; + } + p_digits = p_buf; + p_buf += n_digits; + if (spec->n_rsign == 1) { + *p_buf++ = spec->rsign; + } + if (spec->n_rpadding) { + STRINGLIB_FILL(p_buf, fill_char, spec->n_rpadding); + p_buf += spec->n_rpadding; + } + return p_digits; +} + +/************************************************************************/ +/*********** string formatting ******************************************/ +/************************************************************************/ + +static PyObject * +format_string_internal(PyObject *value, const InternalFormatSpec *format) +{ + Py_ssize_t width; /* total field width */ + Py_ssize_t lpad; + STRINGLIB_CHAR *dst; + STRINGLIB_CHAR *src = STRINGLIB_STR(value); + 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; + } + + /* '=' 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; + } + + if (format->width >= 0) { + width = format->width; + + /* but use at least len characters */ + if (len > width) { + width = len; + } + } else { + /* not specified, use all of the chars and no more */ + width = len; + } + + /* allocate the resulting string */ + result = STRINGLIB_NEW(NULL, width); + if (result == NULL) + goto done; + + /* now write into that space */ + dst = STRINGLIB_STR(result); + + /* figure out how much leading space we need, based on the + aligning */ + if (format->align == '>') + lpad = width - len; + else if (format->align == '^') + lpad = (width - len) / 2; + else + lpad = 0; + + /* if right aligning, increment the destination allow space on the + left */ + memcpy(dst + lpad, src, len * sizeof(STRINGLIB_CHAR)); + + /* do any padding */ + if (width > len) { + STRINGLIB_CHAR fill_char = format->fill_char; + if (fill_char == '\0') { + /* use the default, if not specified */ + fill_char = ' '; + } + + /* pad on left */ + if (lpad) + STRINGLIB_FILL(dst, fill_char, lpad); + + /* pad on right */ + if (width - len - lpad) + STRINGLIB_FILL(dst + len + lpad, fill_char, width - len - lpad); + } + +done: + return result; +} + + +/************************************************************************/ +/*********** long formatting ********************************************/ +/************************************************************************/ + +static PyObject * +format_long_internal(PyObject *value, const InternalFormatSpec *format) +{ + PyObject *result = NULL; + int total_leading_chars_to_skip = 0; /* also includes sign, if + present */ + STRINGLIB_CHAR sign = '\0'; + STRINGLIB_CHAR *p; + Py_ssize_t n_digits; /* count of digits need from the computed + string */ + Py_ssize_t len; + Py_ssize_t tmp; + NumberFieldWidths spec; + long x; + + /* 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 */ + x = PyInt_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 + result = STRINGLIB_NEW(NULL, 1); + if (result == NULL) + goto done; + p = STRINGLIB_STR(result); + p[0] = (Py_UNICODE) x; + n_digits = len = 1; + } else { + int base; + int format_leading_chars_to_skip; /* characters added by + PyNumber_ToBase that we + want to skip over. + instead of using them, + we'll compute our + own. */ + /* compute the base and how many characters will be added by + PyNumber_ToBase */ + switch (format->type) { + case 'b': + base = 2; + format_leading_chars_to_skip = 2; /* 0b */ + break; + case 'o': + base = 8; + format_leading_chars_to_skip = 2; /* 0o */ + break; + case 'x': + case 'X': + base = 16; + format_leading_chars_to_skip = 2; /* 0x */ + break; + default: /* shouldn't be needed, but stops a compiler warning */ + case 'd': + base = 10; + format_leading_chars_to_skip = 0; + break; + } + + /* do the hard part, converting to a string in a given base */ + result = PyNumber_ToBase(value, base); + if (result == NULL) + goto done; + + n_digits = STRINGLIB_LEN(result); + len = n_digits; + p = STRINGLIB_STR(result); + + /* if X, convert to uppercase */ + if (format->type == 'X') + for (tmp = 0; tmp < len; tmp++) + p[tmp] = STRINGLIB_TOUPPER(p[tmp]); + + /* is a sign character present in the output? if so, remember it + and skip it */ + sign = p[0]; + if (sign == '-') { + total_leading_chars_to_skip += 1; + n_digits--; + } + + /* skip over the leading digits (0x, 0b, etc.) */ + assert(n_digits >= format_leading_chars_to_skip + 1); + n_digits -= format_leading_chars_to_skip; + total_leading_chars_to_skip += format_leading_chars_to_skip; + } + + calc_number_widths(&spec, sign, n_digits, format); + + /* if the buffer is getting bigger, realloc it. if it's getting + smaller, don't realloc because we need to move the results + around first. realloc after we've done that */ + + if (spec.n_total > len) { + if (STRINGLIB_RESIZE(&result, spec.n_total) < 0) + goto done; + /* recalc, because string might have moved */ + p = STRINGLIB_STR(result); + } + + /* copy the characters into position first, since we're going to + overwrite some of that space */ + /* we need to move if the number of left padding in the output is + different from the number of characters we need to skip */ + if ((spec.n_lpadding + spec.n_lsign + spec.n_spadding) != + total_leading_chars_to_skip) { + memmove(p + (spec.n_lpadding + spec.n_lsign + spec.n_spadding), + p + total_leading_chars_to_skip, + n_digits * sizeof(STRINGLIB_CHAR)); + } + + /* now fill in the non-digit parts */ + fill_number(p, &spec, n_digits, + format->fill_char == '\0' ? ' ' : format->fill_char); + + /* if we're getting smaller, realloc now */ + if (spec.n_total < len) { + if (STRINGLIB_RESIZE(&result, spec.n_total) < 0) + goto done; + } + +done: + return result; +} + + +/************************************************************************/ +/*********** float formatting *******************************************/ +/************************************************************************/ + +/* taken from unicodeobject.c */ +static Py_ssize_t +strtounicode(Py_UNICODE *buffer, const char *charbuffer) +{ + register Py_ssize_t i; + Py_ssize_t len = strlen(charbuffer); + for (i = len - 1; i >= 0; i--) + buffer[i] = (Py_UNICODE) charbuffer[i]; + + return len; +} + +/* the callback function to call to do the actual float formatting. + it matches the definition of PyOS_ascii_formatd */ +typedef char* +(*DoubleSnprintfFunction)(char *buffer, size_t buf_len, + const char *format, double d); + +/* just a wrapper to make PyOS_snprintf look like DoubleSnprintfFunction */ +static char* +snprintf_double(char *buffer, size_t buf_len, const char *format, double d) +{ + PyOS_snprintf(buffer, buf_len, format, d); + return NULL; +} + +/* see FORMATBUFLEN in unicodeobject.c */ +#define FLOAT_FORMATBUFLEN 120 + +/* much of this is taken from unicodeobject.c */ +/* use type instead of format->type, so that it can be overridden by + format_number() */ +static PyObject * +_format_float(STRINGLIB_CHAR type, PyObject *value, + const InternalFormatSpec *format, + DoubleSnprintfFunction snprintf) +{ + /* fmt = '%.' + `prec` + `type` + '%%' + worst case length = 2 + 10 (len of INT_MAX) + 1 + 2 = 15 (use 20)*/ + char fmt[20]; + + /* taken from unicodeobject.c */ + /* Worst case length calc to ensure no buffer overrun: + + 'g' formats: + fmt = %#.<prec>g + buf = '-' + [0-9]*prec + '.' + 'e+' + (longest exp + for any double rep.) + len = 1 + prec + 1 + 2 + 5 = 9 + prec + + 'f' formats: + buf = '-' + [0-9]*x + '.' + [0-9]*prec (with x < 50) + len = 1 + 50 + 1 + prec = 52 + prec + + If prec=0 the effective precision is 1 (the leading digit is + always given), therefore increase the length by one. + + */ + char charbuf[FLOAT_FORMATBUFLEN]; + Py_ssize_t n_digits; + double x; + Py_ssize_t precision = format->precision; + PyObject *result = NULL; + STRINGLIB_CHAR sign; + char* trailing = ""; + STRINGLIB_CHAR *p; + NumberFieldWidths spec; + +#if STRINGLIB_IS_UNICODE + Py_UNICODE unicodebuf[FLOAT_FORMATBUFLEN]; +#endif + + /* first, do the conversion as 8-bit chars, using the platform's + snprintf. then, if needed, convert to unicode. */ + + /* 'F' is the same as 'f', per the PEP */ + if (type == 'F') + type = 'f'; + + x = PyFloat_AsDouble(value); + + if (x == -1.0 && PyErr_Occurred()) + goto done; + + if (type == '%') { + type = 'f'; + x *= 100; + trailing = "%"; + } + + if (precision < 0) + precision = 6; + if (type == 'f' && (fabs(x) / 1e25) >= 1e25) + 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 */ + PyOS_snprintf(fmt, sizeof(fmt), "%%.%zd%c", precision, (char)type); + + /* call the passed in function to do the actual formatting */ + snprintf(charbuf, sizeof(charbuf), fmt, x); + + /* adding trailing to fmt with PyOS_snprintf doesn't work, not + sure why. we'll just concatentate it here, no harm done. we + know we can't have a buffer overflow from the fmt size + analysis */ + strcat(charbuf, trailing); + + /* rather than duplicate the code for snprintf for both unicode + and 8 bit strings, we just use the 8 bit version and then + convert to unicode in a separate code path. that's probably + the lesser of 2 evils. */ +#if STRINGLIB_IS_UNICODE + n_digits = strtounicode(unicodebuf, charbuf); + p = unicodebuf; +#else + /* compute the length. I believe this is done because the return + value from snprintf above is unreliable */ + n_digits = strlen(charbuf); + p = charbuf; +#endif + + /* is a sign character present in the output? if so, remember it + and skip it */ + sign = p[0]; + if (sign == '-') { + p++; + n_digits--; + } + + calc_number_widths(&spec, sign, n_digits, format); + + /* allocate a string with enough space */ + result = STRINGLIB_NEW(NULL, spec.n_total); + if (result == NULL) + goto done; + + /* fill in the non-digit parts */ + fill_number(STRINGLIB_STR(result), &spec, n_digits, + format->fill_char == '\0' ? ' ' : format->fill_char); + + /* fill in the digit parts */ + memmove(STRINGLIB_STR(result) + (spec.n_lpadding + spec.n_lsign + spec.n_spadding), + p, + n_digits * sizeof(STRINGLIB_CHAR)); + +done: + return result; +} + +static PyObject * +format_float_internal(PyObject *value, const InternalFormatSpec *format) +{ + if (format->type == 'n') + return _format_float('f', value, format, snprintf_double); + else + return _format_float(format->type, value, format, PyOS_ascii_formatd); +} + +/************************************************************************/ +/*********** built in formatters ****************************************/ +/************************************************************************/ + +PyObject * +FORMAT_STRING(PyObject* value, PyObject* args) +{ + PyObject *format_spec; + PyObject *tmp = NULL; + PyObject *result = NULL; + InternalFormatSpec format; + + if (!PyArg_ParseTuple(args, "O:__format__", &format_spec)) + goto done; + if (!STRINGLIB_CHECK(format_spec)) { + PyErr_SetString(PyExc_TypeError, STRINGLIB_TYPE_NAME " object required"); + goto done; + } + + /* check for the special case of zero length format spec, make + it equivalent to str(value) */ + if (STRINGLIB_LEN(format_spec) == 0) { + result = STRINGLIB_TOSTR(value); + goto done; + } + + /* parse the format_spec */ + if (!parse_internal_render_format_spec(format_spec, &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(value, &format); + break; +#if 0 + case 'b': + case 'c': + case 'd': + case 'o': + case 'x': + case 'X': + /* convert to integer */ + /* XXX: make a stringlib function to do this when backporting, + since FromUnicode differs from FromString */ + tmp = PyLong_FromUnicode(STRINGLIB_STR(value), STRINGLIB_LEN(value), 0); + if (tmp == NULL) + goto done; + result = format_long_internal(tmp, &format); + break; + + case 'e': + case 'E': + case 'f': + case 'F': + case 'g': + case 'G': + case 'n': + case '%': + /* convert to float */ + tmp = PyFloat_FromString(value); + if (tmp == NULL) + goto done; + result = format_float_internal(tmp, &format); + break; +#endif + default: + /* unknown */ + PyErr_Format(PyExc_ValueError, "Unknown conversion type %c", + format.type); + goto done; + } + +done: + Py_XDECREF(tmp); + return result; +} + +PyObject * +FORMAT_LONG(PyObject* value, PyObject* args) +{ + PyObject *format_spec; + PyObject *result = NULL; + PyObject *tmp = NULL; + InternalFormatSpec format; + + if (!PyArg_ParseTuple(args, "O:__format__", &format_spec)) + goto done; + if (!STRINGLIB_CHECK(format_spec)) { + PyErr_SetString(PyExc_TypeError, STRINGLIB_TYPE_NAME " object required"); + goto done; + } + + /* check for the special case of zero length format spec, make + it equivalent to str(value) */ + if (STRINGLIB_LEN(format_spec) == 0) { + result = STRINGLIB_TOSTR(value); + goto done; + } + + /* parse the format_spec */ + if (!parse_internal_render_format_spec(format_spec, &format, 'd')) + goto done; + + /* type conversion? */ + switch (format.type) { +#if 0 + case 's': + /* convert to string/unicode */ + tmp = STRINGLIB_TOSTR(value); + if (tmp == NULL) + goto done; + result = format_string_internal(tmp, &format); + break; +#endif + case 'b': + case 'c': + case 'd': + case 'o': + case 'x': + case 'X': + /* no type conversion needed, already an int. do the formatting */ + result = format_long_internal(value, &format); + break; + + case 'e': + case 'E': + case 'f': + case 'F': + case 'g': + case 'G': + case 'n': + case '%': + /* convert to float */ + tmp = PyNumber_Float(value); + if (tmp == NULL) + goto done; + result = format_float_internal(value, &format); + break; + + default: + /* unknown */ + PyErr_Format(PyExc_ValueError, "Unknown conversion type %c", + format.type); + goto done; + } + +done: + Py_XDECREF(tmp); + return result; +} + +PyObject * +FORMAT_FLOAT(PyObject *value, PyObject *args) +{ + PyObject *format_spec; + PyObject *result = NULL; + PyObject *tmp = NULL; + InternalFormatSpec format; + + if (!PyArg_ParseTuple(args, "O:__format__", &format_spec)) + goto done; + if (!STRINGLIB_CHECK(format_spec)) { + PyErr_SetString(PyExc_TypeError, STRINGLIB_TYPE_NAME " object required"); + goto done; + } + + /* check for the special case of zero length format spec, make + it equivalent to str(value) */ + if (STRINGLIB_LEN(format_spec) == 0) { + result = STRINGLIB_TOSTR(value); + goto done; + } + + /* parse the format_spec */ + if (!parse_internal_render_format_spec(format_spec, &format, 'g')) + goto done; + + /* type conversion? */ + switch (format.type) { +#if 0 + case 's': + /* convert to string/unicode */ + tmp = STRINGLIB_TOSTR(value); + if (tmp == NULL) + goto done; + result = format_string_internal(tmp, &format); + break; +#endif + case 'b': + case 'c': + case 'd': + case 'o': + case 'x': + case 'X': + /* convert to integer */ + tmp = PyNumber_Long(value); + if (tmp == NULL) + goto done; + result = format_long_internal(tmp, &format); + break; + + 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(value, &format); + break; + + default: + /* unknown */ + PyErr_Format(PyExc_ValueError, "Unknown conversion type %c", + format.type); + goto done; + } + +done: + Py_XDECREF(tmp); + return result; +} |