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gh-89653: PEP 670: Convert unicodeobject.h macros to functions #92648

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May 11, 2022
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gh-89653: PEP 670: Convert unicodeobject.h macros to functions #92648

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114 changes: 66 additions & 48 deletions Include/cpython/unicodeobject.h
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Original file line number Diff line number Diff line change
Expand Up @@ -15,53 +15,31 @@
# define USE_UNICODE_WCHAR_CACHE 1
#endif /* USE_UNICODE_WCHAR_CACHE */

/* Since splitting on whitespace is an important use case, and
whitespace in most situations is solely ASCII whitespace, we
optimize for the common case by using a quick look-up table
_Py_ascii_whitespace (see below) with an inlined check.

*/
#define Py_UNICODE_ISSPACE(ch) \
((Py_UCS4)(ch) < 128U ? _Py_ascii_whitespace[(ch)] : _PyUnicode_IsWhitespace(ch))

#define Py_UNICODE_ISLOWER(ch) _PyUnicode_IsLowercase(ch)
#define Py_UNICODE_ISUPPER(ch) _PyUnicode_IsUppercase(ch)
#define Py_UNICODE_ISTITLE(ch) _PyUnicode_IsTitlecase(ch)
#define Py_UNICODE_ISLINEBREAK(ch) _PyUnicode_IsLinebreak(ch)

#define Py_UNICODE_TOLOWER(ch) _PyUnicode_ToLowercase(ch)
#define Py_UNICODE_TOUPPER(ch) _PyUnicode_ToUppercase(ch)
#define Py_UNICODE_TOTITLE(ch) _PyUnicode_ToTitlecase(ch)

#define Py_UNICODE_ISDECIMAL(ch) _PyUnicode_IsDecimalDigit(ch)
#define Py_UNICODE_ISDIGIT(ch) _PyUnicode_IsDigit(ch)
#define Py_UNICODE_ISNUMERIC(ch) _PyUnicode_IsNumeric(ch)
#define Py_UNICODE_ISPRINTABLE(ch) _PyUnicode_IsPrintable(ch)
// Static inline functions to work with surrogates
static inline int Py_UNICODE_IS_SURROGATE(Py_UCS4 ch) {
return (0xD800 <= ch && ch <= 0xDFFF);
}
static inline int Py_UNICODE_IS_HIGH_SURROGATE(Py_UCS4 ch) {
return (0xD800 <= ch && ch <= 0xDBFF);
}
static inline int Py_UNICODE_IS_LOW_SURROGATE(Py_UCS4 ch) {
return (0xDC00 <= ch && ch <= 0xDFFF);
}

#define Py_UNICODE_TODECIMAL(ch) _PyUnicode_ToDecimalDigit(ch)
#define Py_UNICODE_TODIGIT(ch) _PyUnicode_ToDigit(ch)
#define Py_UNICODE_TONUMERIC(ch) _PyUnicode_ToNumeric(ch)
// Join two surrogate characters and return a single Py_UCS4 value.
static inline Py_UCS4 Py_UNICODE_JOIN_SURROGATES(Py_UCS4 high, Py_UCS4 low) {
return 0x10000 + (((high & 0x03FF) << 10) | (low & 0x03FF));
}

#define Py_UNICODE_ISALPHA(ch) _PyUnicode_IsAlpha(ch)
// High surrogate = top 10 bits added to D800
static inline Py_UCS4 Py_UNICODE_HIGH_SURROGATE(Py_UCS4 ch) {
return (0xD800 - (0x10000 >> 10) + (ch >> 10));
}

#define Py_UNICODE_ISALNUM(ch) \
(Py_UNICODE_ISALPHA(ch) || \
Py_UNICODE_ISDECIMAL(ch) || \
Py_UNICODE_ISDIGIT(ch) || \
Py_UNICODE_ISNUMERIC(ch))

/* macros to work with surrogates */
#define Py_UNICODE_IS_SURROGATE(ch) (0xD800 <= (ch) && (ch) <= 0xDFFF)
#define Py_UNICODE_IS_HIGH_SURROGATE(ch) (0xD800 <= (ch) && (ch) <= 0xDBFF)
#define Py_UNICODE_IS_LOW_SURROGATE(ch) (0xDC00 <= (ch) && (ch) <= 0xDFFF)
/* Join two surrogate characters and return a single Py_UCS4 value. */
#define Py_UNICODE_JOIN_SURROGATES(high, low) \
(((((Py_UCS4)(high) & 0x03FF) << 10) | \
((Py_UCS4)(low) & 0x03FF)) + 0x10000)
/* high surrogate = top 10 bits added to D800 */
#define Py_UNICODE_HIGH_SURROGATE(ch) (0xD800 - (0x10000 >> 10) + ((ch) >> 10))
/* low surrogate = bottom 10 bits added to DC00 */
#define Py_UNICODE_LOW_SURROGATE(ch) (0xDC00 + ((ch) & 0x3FF))
// Low surrogate = bottom 10 bits added to DC00
static inline Py_UCS4 Py_UNICODE_LOW_SURROGATE(Py_UCS4 ch) {
return (0xDC00 + (ch & 0x3FF));
}

/* --- Unicode Type ------------------------------------------------------- */

Expand Down Expand Up @@ -1013,10 +991,6 @@ PyAPI_FUNC(Py_ssize_t) _PyUnicode_InsertThousandsGrouping(

/* === Characters Type APIs =============================================== */

/* Helper array used by Py_UNICODE_ISSPACE(). */

PyAPI_DATA(const unsigned char) _Py_ascii_whitespace[];

/* These should not be used directly. Use the Py_UNICODE_IS* and
Py_UNICODE_TO* macros instead.

Expand Down Expand Up @@ -1124,6 +1098,50 @@ PyAPI_FUNC(int) _PyUnicode_IsAlpha(
Py_UCS4 ch /* Unicode character */
);

// Helper array used by Py_UNICODE_ISSPACE().
PyAPI_DATA(const unsigned char) _Py_ascii_whitespace[];

// Since splitting on whitespace is an important use case, and
// whitespace in most situations is solely ASCII whitespace, we
// optimize for the common case by using a quick look-up table
// _Py_ascii_whitespace (see below) with an inlined check.
static inline int Py_UNICODE_ISSPACE(Py_UCS4 ch) {
if (ch < 128) {
return _Py_ascii_whitespace[ch];
}
return _PyUnicode_IsWhitespace(ch);
}

#define Py_UNICODE_ISLOWER(ch) _PyUnicode_IsLowercase(ch)
#define Py_UNICODE_ISUPPER(ch) _PyUnicode_IsUppercase(ch)
#define Py_UNICODE_ISTITLE(ch) _PyUnicode_IsTitlecase(ch)
#define Py_UNICODE_ISLINEBREAK(ch) _PyUnicode_IsLinebreak(ch)

#define Py_UNICODE_TOLOWER(ch) _PyUnicode_ToLowercase(ch)
#define Py_UNICODE_TOUPPER(ch) _PyUnicode_ToUppercase(ch)
#define Py_UNICODE_TOTITLE(ch) _PyUnicode_ToTitlecase(ch)

#define Py_UNICODE_ISDECIMAL(ch) _PyUnicode_IsDecimalDigit(ch)
#define Py_UNICODE_ISDIGIT(ch) _PyUnicode_IsDigit(ch)
#define Py_UNICODE_ISNUMERIC(ch) _PyUnicode_IsNumeric(ch)
#define Py_UNICODE_ISPRINTABLE(ch) _PyUnicode_IsPrintable(ch)

#define Py_UNICODE_TODECIMAL(ch) _PyUnicode_ToDecimalDigit(ch)
#define Py_UNICODE_TODIGIT(ch) _PyUnicode_ToDigit(ch)
#define Py_UNICODE_TONUMERIC(ch) _PyUnicode_ToNumeric(ch)

#define Py_UNICODE_ISALPHA(ch) _PyUnicode_IsAlpha(ch)

static inline int Py_UNICODE_ISALNUM(Py_UCS4 ch) {
return (Py_UNICODE_ISALPHA(ch)
|| Py_UNICODE_ISDECIMAL(ch)
|| Py_UNICODE_ISDIGIT(ch)
|| Py_UNICODE_ISNUMERIC(ch));
}


/* === Misc functions ===================================================== */

PyAPI_FUNC(PyObject*) _PyUnicode_FormatLong(PyObject *, int, int, int);

/* Return an interned Unicode object for an Identifier; may fail if there is no memory.*/
Expand Down