cpython/Objects/unicodectype.c at doc-link-https · 180909/cpython · GitHub

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Unicode character type helpers.

Written by Marc-Andre Lemburg (mal@lemburg.com).

Modified for Python 2.0 by Fredrik Lundh (fredrik@pythonware.com)

#include "Python.h"

#define ALPHA_MASK 0x01

#define DECIMAL_MASK 0x02

#define DIGIT_MASK 0x04

#define LOWER_MASK 0x08

#define TITLE_MASK 0x40

#define UPPER_MASK 0x80

#define XID_START_MASK 0x100

#define XID_CONTINUE_MASK 0x200

#define PRINTABLE_MASK 0x400

#define NUMERIC_MASK 0x800

#define CASE_IGNORABLE_MASK 0x1000

#define CASED_MASK 0x2000

#define EXTENDED_CASE_MASK 0x4000

typedef struct {

These are either deltas to the character or offsets in

_PyUnicode_ExtendedCase.

const int upper;

const int lower;

const int title;

/* Note if more flag space is needed, decimal and digit could be unified. */

const unsigned char decimal;

const unsigned char digit;

const unsigned short flags;

} _PyUnicode_TypeRecord;

#include "unicodetype_db.h"

static const _PyUnicode_TypeRecord *

gettyperecord(Py_UCS4 code)

{

int index;

if (code >= 0x110000)

index = 0;

else

{

index = index1[(code>>SHIFT)];

index = index2[(index<<SHIFT)+(code&((1<<SHIFT)-1))];

}

return &_PyUnicode_TypeRecords[index];

}

/* Returns the titlecase Unicode characters corresponding to ch or just

ch if no titlecase mapping is known. */

Py_UCS4 _PyUnicode_ToTitlecase(Py_UCS4 ch)

{

const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);

if (ctype->flags & EXTENDED_CASE_MASK)

return _PyUnicode_ExtendedCase[ctype->title & 0xFFFF];

return ch + ctype->title;

}

/* Returns 1 for Unicode characters having the category 'Lt', 0

otherwise. */

int _PyUnicode_IsTitlecase(Py_UCS4 ch)

{

const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);

return (ctype->flags & TITLE_MASK) != 0;

}

/* Returns 1 for Unicode characters having the XID_Start property, 0

otherwise. */

int _PyUnicode_IsXidStart(Py_UCS4 ch)

{

const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);

return (ctype->flags & XID_START_MASK) != 0;

}

/* Returns 1 for Unicode characters having the XID_Continue property,

0 otherwise. */

int _PyUnicode_IsXidContinue(Py_UCS4 ch)

{

const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);

return (ctype->flags & XID_CONTINUE_MASK) != 0;

}

/* Returns the integer decimal (0-9) for Unicode characters having

this property, -1 otherwise. */

int _PyUnicode_ToDecimalDigit(Py_UCS4 ch)

{

const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);

return (ctype->flags & DECIMAL_MASK) ? ctype->decimal : -1;

}

int _PyUnicode_IsDecimalDigit(Py_UCS4 ch)

{

if (_PyUnicode_ToDecimalDigit(ch) < 0)

return 0;

return 1;

}

/* Returns the integer digit (0-9) for Unicode characters having

this property, -1 otherwise. */

int _PyUnicode_ToDigit(Py_UCS4 ch)

{

const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);

return (ctype->flags & DIGIT_MASK) ? ctype->digit : -1;

}

int _PyUnicode_IsDigit(Py_UCS4 ch)

{

if (_PyUnicode_ToDigit(ch) < 0)

return 0;

return 1;

}

/* Returns the numeric value as double for Unicode characters having

this property, -1.0 otherwise. */

int _PyUnicode_IsNumeric(Py_UCS4 ch)

{

const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);

return (ctype->flags & NUMERIC_MASK) != 0;

}

/* Returns 1 for Unicode characters to be hex-escaped when repr()ed,

0 otherwise.

All characters except those characters defined in the Unicode character

database as following categories are considered printable.

* Cc (Other, Control)

* Cf (Other, Format)

* Cs (Other, Surrogate)

* Co (Other, Private Use)

* Cn (Other, Not Assigned)

* Zl Separator, Line ('\u2028', LINE SEPARATOR)

* Zp Separator, Paragraph ('\u2029', PARAGRAPH SEPARATOR)

* Zs (Separator, Space) other than ASCII space('\x20').

int _PyUnicode_IsPrintable(Py_UCS4 ch)

{

const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);

return (ctype->flags & PRINTABLE_MASK) != 0;

}

/* Returns 1 for Unicode characters having the category 'Ll', 0

otherwise. */

int _PyUnicode_IsLowercase(Py_UCS4 ch)

{

const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);

return (ctype->flags & LOWER_MASK) != 0;

}

/* Returns 1 for Unicode characters having the category 'Lu', 0

otherwise. */

int _PyUnicode_IsUppercase(Py_UCS4 ch)

{

const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);

return (ctype->flags & UPPER_MASK) != 0;

}

/* Returns the uppercase Unicode characters corresponding to ch or just

ch if no uppercase mapping is known. */

Py_UCS4 _PyUnicode_ToUppercase(Py_UCS4 ch)

{

const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);

if (ctype->flags & EXTENDED_CASE_MASK)

return _PyUnicode_ExtendedCase[ctype->upper & 0xFFFF];

return ch + ctype->upper;

}

/* Returns the lowercase Unicode characters corresponding to ch or just

ch if no lowercase mapping is known. */

Py_UCS4 _PyUnicode_ToLowercase(Py_UCS4 ch)

{

const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);

if (ctype->flags & EXTENDED_CASE_MASK)

return _PyUnicode_ExtendedCase[ctype->lower & 0xFFFF];

return ch + ctype->lower;

}

int _PyUnicode_ToLowerFull(Py_UCS4 ch, Py_UCS4 *res)

{

const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);

if (ctype->flags & EXTENDED_CASE_MASK) {

int index = ctype->lower & 0xFFFF;

int n = ctype->lower >> 24;

int i;

for (i = 0; i < n; i++)

res[i] = _PyUnicode_ExtendedCase[index + i];

return n;

}

res[0] = ch + ctype->lower;

return 1;

}

int _PyUnicode_ToTitleFull(Py_UCS4 ch, Py_UCS4 *res)

{

const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);

if (ctype->flags & EXTENDED_CASE_MASK) {

int index = ctype->title & 0xFFFF;

int n = ctype->title >> 24;

int i;

for (i = 0; i < n; i++)

res[i] = _PyUnicode_ExtendedCase[index + i];

return n;

}

res[0] = ch + ctype->title;

return 1;

}

int _PyUnicode_ToUpperFull(Py_UCS4 ch, Py_UCS4 *res)

{

const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);

if (ctype->flags & EXTENDED_CASE_MASK) {

int index = ctype->upper & 0xFFFF;

int n = ctype->upper >> 24;

int i;

for (i = 0; i < n; i++)

res[i] = _PyUnicode_ExtendedCase[index + i];

return n;

}

res[0] = ch + ctype->upper;

return 1;

}

int _PyUnicode_ToFoldedFull(Py_UCS4 ch, Py_UCS4 *res)

{

const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);

if (ctype->flags & EXTENDED_CASE_MASK && (ctype->lower >> 20) & 7) {

int index = (ctype->lower & 0xFFFF) + (ctype->lower >> 24);

int n = (ctype->lower >> 20) & 7;

int i;

for (i = 0; i < n; i++)

res[i] = _PyUnicode_ExtendedCase[index + i];

return n;

}

return _PyUnicode_ToLowerFull(ch, res);

}

int _PyUnicode_IsCased(Py_UCS4 ch)

{

const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);

return (ctype->flags & CASED_MASK) != 0;

}

int _PyUnicode_IsCaseIgnorable(Py_UCS4 ch)

{

const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);

return (ctype->flags & CASE_IGNORABLE_MASK) != 0;

}

/* Returns 1 for Unicode characters having the category 'Ll', 'Lu', 'Lt',

'Lo' or 'Lm', 0 otherwise. */

int _PyUnicode_IsAlpha(Py_UCS4 ch)

{

const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);

return (ctype->flags & ALPHA_MASK) != 0;

}

cpython/Objects/unicodectype.c at doc-link-https · 180909/cpython · GitHub

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