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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdint.h>
#include "py/unicode.h"
// attribute flags
#define FL_PRINT (0x01)
#define FL_SPACE (0x02)
#define FL_DIGIT (0x04)
#define FL_ALPHA (0x08)
#define FL_UPPER (0x10)
#define FL_LOWER (0x20)
#define FL_XDIGIT (0x40)
// shorthand character attributes
#define AT_PR (FL_PRINT)
#define AT_SP (FL_SPACE | FL_PRINT)
#define AT_DI (FL_DIGIT | FL_PRINT | FL_XDIGIT)
#define AT_AL (FL_ALPHA | FL_PRINT)
#define AT_UP (FL_UPPER | FL_ALPHA | FL_PRINT)
#define AT_LO (FL_LOWER | FL_ALPHA | FL_PRINT)
#define AT_UX (FL_UPPER | FL_ALPHA | FL_PRINT | FL_XDIGIT)
#define AT_LX (FL_LOWER | FL_ALPHA | FL_PRINT | FL_XDIGIT)
// table of attributes for ascii characters
STATIC const uint8_t attr[] = {
0, 0, 0, 0, 0, 0, 0, 0,
0, AT_SP, AT_SP, AT_SP, AT_SP, AT_SP, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
AT_SP, AT_PR, AT_PR, AT_PR, AT_PR, AT_PR, AT_PR, AT_PR,
AT_PR, AT_PR, AT_PR, AT_PR, AT_PR, AT_PR, AT_PR, AT_PR,
AT_DI, AT_DI, AT_DI, AT_DI, AT_DI, AT_DI, AT_DI, AT_DI,
AT_DI, AT_DI, AT_PR, AT_PR, AT_PR, AT_PR, AT_PR, AT_PR,
AT_PR, AT_UX, AT_UX, AT_UX, AT_UX, AT_UX, AT_UX, AT_UP,
AT_UP, AT_UP, AT_UP, AT_UP, AT_UP, AT_UP, AT_UP, AT_UP,
AT_UP, AT_UP, AT_UP, AT_UP, AT_UP, AT_UP, AT_UP, AT_UP,
AT_UP, AT_UP, AT_UP, AT_PR, AT_PR, AT_PR, AT_PR, AT_PR,
AT_PR, AT_LX, AT_LX, AT_LX, AT_LX, AT_LX, AT_LX, AT_LO,
AT_LO, AT_LO, AT_LO, AT_LO, AT_LO, AT_LO, AT_LO, AT_LO,
AT_LO, AT_LO, AT_LO, AT_LO, AT_LO, AT_LO, AT_LO, AT_LO,
AT_LO, AT_LO, AT_LO, AT_PR, AT_PR, AT_PR, AT_PR, 0
};
#if MICROPY_PY_BUILTINS_STR_UNICODE
unichar utf8_get_char(const byte *s) {
unichar ord = *s++;
if (!UTF8_IS_NONASCII(ord)) {
return ord;
}
ord &= 0x7F;
for (unichar mask = 0x40; ord & mask; mask >>= 1) {
ord &= ~mask;
}
while (UTF8_IS_CONT(*s)) {
ord = (ord << 6) | (*s++ & 0x3F);
}
return ord;
}
const byte *utf8_next_char(const byte *s) {
++s;
while (UTF8_IS_CONT(*s)) {
++s;
}
return s;
}
mp_uint_t utf8_ptr_to_index(const byte *s, const byte *ptr) {
mp_uint_t i = 0;
while (ptr > s) {
if (!UTF8_IS_CONT(*--ptr)) {
i++;
}
}
return i;
}
size_t utf8_charlen(const byte *str, size_t len) {
size_t charlen = 0;
for (const byte *top = str + len; str < top; ++str) {
if (!UTF8_IS_CONT(*str)) {
++charlen;
}
}
return charlen;
}
#endif
// Be aware: These unichar_is* functions are actually ASCII-only!
bool unichar_isspace(unichar c) {
return c < 128 && (attr[c] & FL_SPACE) != 0;
}
bool unichar_isalpha(unichar c) {
return c < 128 && (attr[c] & FL_ALPHA) != 0;
}
/* unused
bool unichar_isprint(unichar c) {
return c < 128 && (attr[c] & FL_PRINT) != 0;
}
*/
bool unichar_isdigit(unichar c) {
return c < 128 && (attr[c] & FL_DIGIT) != 0;
}
bool unichar_isxdigit(unichar c) {
return c < 128 && (attr[c] & FL_XDIGIT) != 0;
}
bool unichar_isident(unichar c) {
return c < 128 && ((attr[c] & (FL_ALPHA | FL_DIGIT)) != 0 || c == '_');
}
bool unichar_isalnum(unichar c) {
return c < 128 && ((attr[c] & (FL_ALPHA | FL_DIGIT)) != 0);
}
bool unichar_isupper(unichar c) {
return c < 128 && (attr[c] & FL_UPPER) != 0;
}
bool unichar_islower(unichar c) {
return c < 128 && (attr[c] & FL_LOWER) != 0;
}
unichar unichar_tolower(unichar c) {
if (unichar_isupper(c)) {
return c + 0x20;
}
return c;
}
unichar unichar_toupper(unichar c) {
if (unichar_islower(c)) {
return c - 0x20;
}
return c;
}
mp_uint_t unichar_xdigit_value(unichar c) {
// c is assumed to be hex digit
mp_uint_t n = c - '0';
if (n > 9) {
n &= ~('a' - 'A');
n -= ('A' - ('9' + 1));
}
return n;
}
#if MICROPY_PY_BUILTINS_STR_UNICODE
bool utf8_check(const byte *p, size_t len) {
uint8_t need = 0;
const byte *end = p + len;
for (; p < end; p++) {
byte c = *p;
if (need) {
if (UTF8_IS_CONT(c)) {
need--;
} else {
// mismatch
return 0;
}
} else {
if (c >= 0xc0) {
if (c >= 0xf8) {
// mismatch
return 0;
}
need = (0xe5 >> ((c >> 3) & 0x6)) & 3;
} else if (c >= 0x80) {
// mismatch
return 0;
}
}
}
return need == 0; // no pending fragments allowed
}
#endif
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