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295 lines (232 loc) · 7.44 KB
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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)
Copyright (c) Corporation for National Research Initiatives.
*/
#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;
}
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