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module.c
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module.c
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#include <Python.h>
#include <ctype.h>
#include <datetime.h>
#include "isocalendar.h"
#include "timezone.h"
#define STRINGIZE(x) #x
#define EXPAND_AND_STRINGIZE(x) STRINGIZE(x)
#define PY_VERSION_AT_LEAST_33 \
((PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION >= 3) || PY_MAJOR_VERSION > 3)
#define PY_VERSION_AT_LEAST_36 \
((PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION >= 6) || PY_MAJOR_VERSION > 3)
#define PY_VERSION_AT_LEAST_37 \
((PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION >= 7) || PY_MAJOR_VERSION > 3)
#define PY_VERSION_AT_LEAST_38 \
((PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION >= 8) || PY_MAJOR_VERSION > 3)
/* PyPy compatibility for cPython 3.7's Timezone API was added to PyPy 7.3.6
* https://foss.heptapod.net/pypy/pypy/-/merge_requests/826
* But was then reverted in 7.3.7 for PyPy 3.7:
* https://foss.heptapod.net/pypy/pypy/-/commit/eeeafcf905afa0f26049ac29dc00f5b295171f99
* It is still present in 7.3.7 for PyPy 3.8+
*/
#ifdef PYPY_VERSION
#define SUPPORTS_37_TIMEZONE_API \
(PYPY_VERSION_NUM >= 0x07030600) && PY_VERSION_AT_LEAST_38
#else
#define SUPPORTS_37_TIMEZONE_API PY_VERSION_AT_LEAST_37
#endif
static PyObject *utc;
#if CISO8601_CACHING_ENABLED
/* 2879 = (1439 * 2) + 1, number of offsets from UTC possible in
* Python (i.e., [-1439, 1439]).
*
* 0 - 1438 = Negative offsets [-1439..-1]
* 1439 = Zero offset
* 1440 - 2878 = Positive offsets [1...1439]
*/
static PyObject *tz_cache[2879] = {NULL};
#endif
#define PARSE_INTEGER(field, length, field_name) \
for (i = 0; i < length; i++) { \
if (*c >= '0' && *c <= '9') { \
field = 10 * field + *c++ - '0'; \
} \
else { \
return format_unexpected_character_exception( \
field_name, c, (c - str) / sizeof(char), length - i); \
} \
}
#define PARSE_FRACTIONAL_SECOND() \
for (i = 0; i < 6; i++) { \
if (*c >= '0' && *c <= '9') { \
usecond = 10 * usecond + *c++ - '0'; \
} \
else if (i == 0) { \
/* We need at least one digit. */ \
/* Trailing '.' or ',' is not allowed */ \
return format_unexpected_character_exception( \
"subsecond", c, (c - str) / sizeof(char), 1); \
} \
else \
break; \
} \
\
/* Omit excessive digits */ \
while (*c >= '0' && *c <= '9') c++; \
\
/* If we break early, fully expand the usecond */ \
while (i++ < 6) usecond *= 10;
#if PY_VERSION_AT_LEAST_33
#define PARSE_SEPARATOR(separator, field_name) \
if (separator) { \
c++; \
} \
else { \
PyObject *unicode_str = PyUnicode_FromString(c); \
PyObject *unicode_char = PyUnicode_Substring(unicode_str, 0, 1); \
PyErr_Format(PyExc_ValueError, \
"Invalid character while parsing %s ('%U', Index: %lu)", \
field_name, unicode_char, (c - str) / sizeof(char)); \
Py_DECREF(unicode_str); \
Py_DECREF(unicode_char); \
return NULL; \
}
#else
#define PARSE_SEPARATOR(separator, field_name) \
if (separator) { \
c++; \
} \
else { \
if (isascii((int)*c)) { \
PyErr_Format( \
PyExc_ValueError, \
"Invalid character while parsing %s ('%c', Index: %lu)", \
field_name, *c, (c - str) / sizeof(char)); \
} \
else { \
PyErr_Format(PyExc_ValueError, \
"Invalid character while parsing %s (Index: %lu)", \
field_name, (c - str) / sizeof(char)); \
} \
return NULL; \
}
#endif
static void *
format_unexpected_character_exception(char *field_name, const char *c,
size_t index,
int expected_character_count)
{
if (*c == '\0') {
PyErr_Format(
PyExc_ValueError,
"Unexpected end of string while parsing %s. Expected %d more "
"character%s",
field_name, expected_character_count,
(expected_character_count != 1) ? "s" : "");
}
else {
#if PY_VERSION_AT_LEAST_33
PyObject *unicode_str = PyUnicode_FromString(c);
PyObject *unicode_char = PyUnicode_Substring(unicode_str, 0, 1);
PyErr_Format(PyExc_ValueError,
"Invalid character while parsing %s ('%U', Index: %zu)",
field_name, unicode_char, index);
Py_DECREF(unicode_str);
Py_DECREF(unicode_char);
#else
if (isascii((int)*c)) {
PyErr_Format(
PyExc_ValueError,
"Invalid character while parsing %s ('%c', Index: %zu)",
field_name, *c, index);
}
else {
PyErr_Format(PyExc_ValueError,
"Invalid character while parsing %s (Index: %zu)",
field_name, index);
}
#endif
}
return NULL;
}
#define IS_CALENDAR_DATE_SEPARATOR (*c == '-')
#define IS_ISOCALENDAR_SEPARATOR (*c == 'W')
#define IS_DATE_AND_TIME_SEPARATOR (*c == 'T' || *c == ' ' || *c == 't')
#define IS_TIME_SEPARATOR (*c == ':')
#define IS_TIME_ZONE_SEPARATOR \
(*c == 'Z' || *c == '-' || *c == '+' || *c == 'z')
#define IS_FRACTIONAL_SEPARATOR (*c == '.' || (*c == ',' && !rfc3339_only))
static PyObject *
_parse(PyObject *self, PyObject *dtstr, int parse_any_tzinfo, int rfc3339_only)
{
PyObject *obj;
PyObject *tzinfo = Py_None;
#if PY_VERSION_AT_LEAST_33
Py_ssize_t len;
#endif
int i;
const char *str;
const char *c;
int year = 0, month = 0, day = 0, hour = 0, minute = 0, second = 0,
usecond = 0;
int iso_week = 0, iso_day = 0;
int ordinal_day = 0;
int time_is_midnight = 0;
int tzhour = 0, tzminute = 0, tzsign = 0;
#if CISO8601_CACHING_ENABLED
int tz_index = 0;
#endif
PyObject *delta;
PyObject *temp;
int extended_date_format = 0;
#if PY_MAJOR_VERSION >= 3
if (!PyUnicode_Check(dtstr)) {
#else
if (!PyString_Check(dtstr)) {
#endif
PyErr_SetString(PyExc_TypeError, "argument must be str");
return NULL;
}
#if PY_VERSION_AT_LEAST_33
str = c = PyUnicode_AsUTF8AndSize(dtstr, &len);
#else
str = c = PyString_AsString(dtstr);
#endif
/* Year */
PARSE_INTEGER(year, 4, "year")
#if !PY_VERSION_AT_LEAST_36
/* Python 3.6+ does this validation as part of datetime's C API
* constructor. See
* https://github.com/python/cpython/commit/b67f0967386a9c9041166d2bbe0a421bd81e10bc
* We skip ` || year < datetime.MAXYEAR)`, since ciso8601 currently doesn't
* support 5 character years, so it is impossible.
*/
if (year <
1) /* datetime.MINYEAR = 1, which is not exposed to the C API. */
{
PyErr_Format(PyExc_ValueError, "year %d is out of range", year);
return NULL;
}
#endif
if (IS_CALENDAR_DATE_SEPARATOR) {
c++;
extended_date_format = 1;
if (IS_ISOCALENDAR_SEPARATOR) { /* Separated ISO Calendar week and day
(i.e., Www-D) */
c++;
if (rfc3339_only) {
PyErr_SetString(PyExc_ValueError,
"Datetime string not in RFC 3339 format.");
return NULL;
}
PARSE_INTEGER(iso_week, 2, "iso_week")
if (*c != '\0' && !IS_DATE_AND_TIME_SEPARATOR) { /* Optional Day */
PARSE_SEPARATOR(IS_CALENDAR_DATE_SEPARATOR,
"date separator ('-')")
PARSE_INTEGER(iso_day, 1, "iso_day")
}
else {
iso_day = 1;
}
int rv = iso_to_ymd(year, iso_week, iso_day, &year, &month, &day);
if (rv) {
PyErr_Format(PyExc_ValueError, "Invalid ISO Calendar date");
return NULL;
}
}
else { /* Separated month and may (i.e., MM-DD) or
ordinal date (i.e., DDD) */
/* For sake of simplicity, we'll assume that it is a month
* If we find out later that it's an ordinal day, then we'll adjust
*/
PARSE_INTEGER(month, 2, "month")
if (*c != '\0' && !IS_DATE_AND_TIME_SEPARATOR) {
if (IS_CALENDAR_DATE_SEPARATOR) { /* Optional day */
c++;
PARSE_INTEGER(day, 2, "day")
}
else { /* Ordinal day */
PARSE_INTEGER(ordinal_day, 1, "ordinal day")
ordinal_day = (month * 10) + ordinal_day;
int rv =
ordinal_to_ymd(year, ordinal_day, &year, &month, &day);
if (rv) {
PyErr_Format(
PyExc_ValueError,
"Invalid ordinal day: %d is %s for year %d",
ordinal_day, rv == -1 ? "too small" : "too large",
year);
return NULL;
}
}
}
else if (rfc3339_only) {
PyErr_SetString(PyExc_ValueError,
"Datetime string not in RFC 3339 format.");
return NULL;
}
else {
day = 1;
}
}
}
else if (rfc3339_only) {
PyErr_SetString(PyExc_ValueError,
"Datetime string not in RFC 3339 format.");
return NULL;
}
else {
if (IS_ISOCALENDAR_SEPARATOR) { /* Non-separated ISO Calendar week and
day (i.e., WwwD) */
c++;
PARSE_INTEGER(iso_week, 2, "iso_week")
if (*c != '\0' && !IS_DATE_AND_TIME_SEPARATOR) { /* Optional Day */
PARSE_INTEGER(iso_day, 1, "iso_day")
}
else {
iso_day = 1;
}
int rv = iso_to_ymd(year, iso_week, iso_day, &year, &month, &day);
if (rv) {
PyErr_Format(PyExc_ValueError, "Invalid ISO Calendar date");
return NULL;
}
}
else { /* Non-separated Month and Day (i.e., MMDD) or
ordinal date (i.e., DDD)*/
/* For sake of simplicity, we'll assume that it is a month
* If we find out later that it's an ordinal day, then we'll adjust
*/
PARSE_INTEGER(month, 2, "month")
PARSE_INTEGER(ordinal_day, 1, "ordinal day")
if (*c == '\0' || IS_DATE_AND_TIME_SEPARATOR) { /* Ordinal day */
ordinal_day = (month * 10) + ordinal_day;
int rv =
ordinal_to_ymd(year, ordinal_day, &year, &month, &day);
if (rv) {
PyErr_Format(PyExc_ValueError,
"Invalid ordinal day: %d is %s for year %d",
ordinal_day,
rv == -1 ? "too small" : "too large", year);
return NULL;
}
}
else { /* Day */
/* Note that YYYYMM is not a valid timestamp. If the calendar
* date is not separated, a day is required (i.e., YYMMDD)
*/
PARSE_INTEGER(day, 1, "day")
day = (ordinal_day * 10) + day;
}
}
}
#if !PY_VERSION_AT_LEAST_36
/* Validation of date fields
* These checks are needed for Python <3.6 support. See
* https://github.com/closeio/ciso8601/pull/30 Python 3.6+ does this
* validation as part of datetime's C API constructor. See
* https://github.com/python/cpython/commit/b67f0967386a9c9041166d2bbe0a421bd81e10bc
*/
if (month < 1 || month > 12) {
PyErr_SetString(PyExc_ValueError, "month must be in 1..12");
return NULL;
}
if (day < 1) {
PyErr_SetString(PyExc_ValueError, "day is out of range for month");
return NULL;
}
/* Validate max day based on month */
switch (month) {
case 2:
/* In the Gregorian calendar three criteria must be taken into
* account to identify leap years:
* -The year can be evenly divided by 4;
* -If the year can be evenly divided by 100, it is NOT a leap
* year, unless;
* -The year is also evenly divisible by 400. Then it is a leap
* year.
*/
if (day > 28) {
unsigned int leap =
(year % 4 == 0) && (year % 100 || (year % 400 == 0));
if (leap == 0 || day > 29) {
PyErr_SetString(PyExc_ValueError,
"day is out of range for month");
return NULL;
}
}
break;
case 4:
case 6:
case 9:
case 11:
if (day > 30) {
PyErr_SetString(PyExc_ValueError,
"day is out of range for month");
return NULL;
}
break;
default:
/* For other months i.e. 1, 3, 5, 7, 8, 10 and 12 */
if (day > 31) {
PyErr_SetString(PyExc_ValueError,
"day is out of range for month");
return NULL;
}
break;
}
#endif
if (*c != '\0') {
/* Date and time separator */
PARSE_SEPARATOR(IS_DATE_AND_TIME_SEPARATOR,
"date and time separator (i.e., 'T', 't', or ' ')")
/* Hour */
PARSE_INTEGER(hour, 2, "hour")
if (*c != '\0' &&
!IS_TIME_ZONE_SEPARATOR) { /* Optional minute and second */
if (IS_TIME_SEPARATOR) { /* Separated Minute and Second
* (i.e., mm:ss)
*/
c++;
/* Minute */
PARSE_INTEGER(minute, 2, "minute")
if (*c != '\0' &&
!IS_TIME_ZONE_SEPARATOR) { /* Optional Second */
PARSE_SEPARATOR(IS_TIME_SEPARATOR, "time separator (':')")
/* Second */
PARSE_INTEGER(second, 2, "second")
/* Optional Fractional Second */
if (IS_FRACTIONAL_SEPARATOR) {
c++;
PARSE_FRACTIONAL_SECOND()
}
}
else if (rfc3339_only) {
PyErr_SetString(PyExc_ValueError,
"RFC 3339 requires the second to be "
"specified.");
return NULL;
}
if (!extended_date_format) {
PyErr_SetString(
PyExc_ValueError,
"Cannot combine \"basic\" date format with"
" \"extended\" time format (Should be either "
"`YYYY-MM-DDThh:mm:ss` or `YYYYMMDDThhmmss`).");
return NULL;
}
}
else if (rfc3339_only) {
PyErr_SetString(PyExc_ValueError,
"Colons separating time components are "
"mandatory in RFC 3339.");
return NULL;
}
else { /* Non-separated Minute and Second (i.e., mmss) */
/* Minute */
PARSE_INTEGER(minute, 2, "minute")
if (*c != '\0' &&
!IS_TIME_ZONE_SEPARATOR) { /* Optional Second */
/* Second */
PARSE_INTEGER(second, 2, "second")
/* Optional Fractional Second */
if (IS_FRACTIONAL_SEPARATOR) {
c++;
PARSE_FRACTIONAL_SECOND()
}
}
if (extended_date_format) {
PyErr_SetString(
PyExc_ValueError,
"Cannot combine \"extended\" date format with"
" \"basic\" time format (Should be either "
"`YYYY-MM-DDThh:mm:ss` or `YYYYMMDDThhmmss`).");
return NULL;
}
}
}
else if (rfc3339_only) {
PyErr_SetString(PyExc_ValueError,
"Minute and second are mandatory in RFC 3339");
return NULL;
}
if (hour == 24 && minute == 0 && second == 0 && usecond == 0) {
/* Special case of 24:00:00, that is allowed in ISO 8601. It is
* equivalent to 00:00:00 the following day
*/
if (rfc3339_only) {
PyErr_SetString(PyExc_ValueError,
"An hour value of 24, while sometimes legal "
"in ISO 8601, is explicitly forbidden by RFC "
"3339.");
return NULL;
}
hour = 0, minute = 0, second = 0, usecond = 0;
time_is_midnight = 1;
}
#if !PY_VERSION_AT_LEAST_36
/* Validate hour/minute/second
* Only needed for Python <3.6 support.
* Python 3.6+ does this validation as part of datetime's constructor).
*/
if (hour > 23) {
PyErr_SetString(PyExc_ValueError, "hour must be in 0..23");
return NULL;
}
if (minute > 59) {
PyErr_SetString(PyExc_ValueError, "minute must be in 0..59");
return NULL;
}
if (second > 59) {
PyErr_SetString(PyExc_ValueError, "second must be in 0..59");
return NULL;
}
#endif
/* Optional tzinfo */
if (IS_TIME_ZONE_SEPARATOR) {
if (*c == '+') {
tzsign = 1;
}
else if (*c == '-') {
tzsign = -1;
}
c++;
if (tzsign != 0) {
/* tz hour */
PARSE_INTEGER(tzhour, 2, "tz hour")
if (IS_TIME_SEPARATOR) { /* Optional separator */
c++;
/* tz minute */
PARSE_INTEGER(tzminute, 2, "tz minute")
}
else if (rfc3339_only) {
PyErr_SetString(PyExc_ValueError,
"Separator between hour and minute in UTC "
"offset is mandatory in RFC 3339");
return NULL;
}
else if (*c != '\0') { /* Optional tz minute */
PARSE_INTEGER(tzminute, 2, "tz minute")
}
}
/* It's not entirely clear whether this validation check is
* necessary under ISO 8601. For now, we will err on the side of
* caution and prevent suspected invalid timestamps. If we need to
* loosen this restriction later, we can.
*/
if (tzminute > 59) {
PyErr_SetString(PyExc_ValueError, "tzminute must be in 0..59");
return NULL;
}
if (parse_any_tzinfo) {
tzminute += 60 * tzhour;
tzminute *= tzsign;
if (tzminute == 0) {
tzinfo = utc;
}
else if (abs(tzminute) >= 1440) {
/* Format the error message as if we were still using pytz
* for Python 2 and datetime.timezone for Python 3.
* This is done to maintain complete backwards
* compatibility with ciso8601 2.0.x. Perhaps change to a
* simpler message in ciso8601 v3.0.0.
*/
#if PY_MAJOR_VERSION >= 3
delta = PyDelta_FromDSU(0, tzminute * 60, 0);
PyErr_Format(PyExc_ValueError,
"offset must be a timedelta"
" strictly between -timedelta(hours=24) and"
" timedelta(hours=24),"
" not %R.",
delta);
Py_DECREF(delta);
#else
PyErr_Format(PyExc_ValueError,
"('absolute offset is too large', %d)",
tzminute);
#endif
return NULL;
}
else {
#if CISO8601_CACHING_ENABLED
tz_index = tzminute + 1439;
if ((tzinfo = tz_cache[tz_index]) == NULL) {
tzinfo = new_fixed_offset(60 * tzminute);
if (tzinfo == NULL) /* i.e., PyErr_Occurred() */
return NULL;
tz_cache[tz_index] = tzinfo;
}
#else
tzinfo = new_fixed_offset(60 * tzminute);
if (tzinfo == NULL) /* i.e., PyErr_Occurred() */
return NULL;
#endif
}
}
}
else if (rfc3339_only) {
PyErr_SetString(PyExc_ValueError,
"UTC offset is mandatory in RFC 3339 format.");
return NULL;
}
}
else if (rfc3339_only) {
PyErr_SetString(PyExc_ValueError,
"Time is mandatory in RFC 3339 format.");
return NULL;
}
/* Make sure that there is no more to parse. */
if (*c != '\0') {
PyErr_Format(PyExc_ValueError, "unconverted data remains: '%s'", c);
#if !CISO8601_CACHING_ENABLED
if (tzinfo != Py_None && tzinfo != utc)
Py_DECREF(tzinfo);
#endif
return NULL;
}
obj = PyDateTimeAPI->DateTime_FromDateAndTime(
year, month, day, hour, minute, second, usecond, tzinfo,
PyDateTimeAPI->DateTimeType);
#if !CISO8601_CACHING_ENABLED
if (tzinfo != Py_None && tzinfo != utc)
Py_DECREF(tzinfo);
#endif
if (obj && time_is_midnight) {
delta = PyDelta_FromDSU(1, 0, 0); /* 1 day */
temp = obj;
obj = PyNumber_Add(temp, delta);
Py_DECREF(delta);
Py_DECREF(temp);
}
return obj;
}
static PyObject *
parse_datetime_as_naive(PyObject *self, PyObject *dtstr)
{
return _parse(self, dtstr, 0, 0);
}
static PyObject *
parse_datetime(PyObject *self, PyObject *dtstr)
{
return _parse(self, dtstr, 1, 0);
}
static PyObject *
parse_rfc3339(PyObject *self, PyObject *dtstr)
{
return _parse(self, dtstr, 1, 1);
}
static PyObject *
_hard_coded_benchmark_timestamp(PyObject *self, PyObject *ignored)
{
return PyDateTimeAPI->DateTime_FromDateAndTime(
2014, 1, 9, 21, 48, 0, 0, Py_None, PyDateTimeAPI->DateTimeType);
}
static PyMethodDef CISO8601Methods[] = {
{"parse_datetime", (PyCFunction)parse_datetime, METH_O,
"Parse a ISO8601 date time string."},
{"parse_datetime_as_naive", parse_datetime_as_naive, METH_O,
"Parse a ISO8601 date time string, ignoring the time zone component."},
{"parse_rfc3339", parse_rfc3339, METH_O,
"Parse an RFC 3339 date time string."},
{"_hard_coded_benchmark_timestamp", _hard_coded_benchmark_timestamp,
METH_NOARGS,
"Return a datetime using hardcoded values (for benchmarking purposes)"},
{NULL, NULL, 0, NULL}};
#if PY_MAJOR_VERSION >= 3
static struct PyModuleDef moduledef = {
PyModuleDef_HEAD_INIT,
"ciso8601",
NULL,
-1,
CISO8601Methods,
NULL,
NULL,
NULL,
NULL,
};
#endif
PyMODINIT_FUNC
#if PY_MAJOR_VERSION >= 3
PyInit_ciso8601(void)
#else
initciso8601(void)
#endif
{
#if PY_MAJOR_VERSION >= 3
PyObject *module = PyModule_Create(&moduledef);
#else
PyObject *module = Py_InitModule("ciso8601", CISO8601Methods);
#endif
/* CISO8601_VERSION is defined in setup.py */
PyModule_AddStringConstant(module, "__version__",
EXPAND_AND_STRINGIZE(CISO8601_VERSION));
PyDateTime_IMPORT;
// PyMODINIT_FUNC is void in Python 2, returns PyObject* in Python 3
if (initialize_timezone_code(module) < 0) {
#if PY_MAJOR_VERSION >= 3
return NULL;
#else
return;
#endif
}
#if SUPPORTS_37_TIMEZONE_API
utc = PyDateTime_TimeZone_UTC;
#else
utc = new_fixed_offset(0);
#endif
// PyMODINIT_FUNC is void in Python 2, returns PyObject* in Python 3
#if PY_MAJOR_VERSION >= 3
return module;
#endif
}