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ydm/cpython__Objects__bytes_methods__bytes_title.c

Created August 22, 2023 15:37
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cpython__Objects__bytes_methods__bytes_title.c
PyDoc_STRVAR_shared(_Py_title__doc__,
"B.title() -> copy of B\n\
\n\
Return a titlecased version of B, i.e. ASCII words start with uppercase\n\
characters, all remaining cased characters have lowercase.");
void
_Py_bytes_title(char *result, const char *s, Py_ssize_t len)
{
Py_ssize_t i;
int previous_is_cased = 0;
for (i = 0; i < len; i++) {
int c = Py_CHARMASK(*s++);
if (Py_ISLOWER(c)) {
if (!previous_is_cased)
c = Py_TOUPPER(c);
previous_is_cased = 1;
} else if (Py_ISUPPER(c)) {
if (previous_is_cased)
c = Py_TOLOWER(c);
previous_is_cased = 1;
} else
previous_is_cased = 0;
*result++ = c;
}
}
@ydm

ydm commented Aug 22, 2023

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/* Argument must be a char or an int in [-128, 127] or [0, 255]. */
#define Py_CHARMASK(c) ((unsigned char)((c) & 0xff))

#define PY_CTF_LOWER  0x01
#define PY_CTF_UPPER  0x02

#define Py_ISLOWER(c)  (_Py_ctype_table[Py_CHARMASK(c)] & PY_CTF_LOWER)
#define Py_ISUPPER(c)  (_Py_ctype_table[Py_CHARMASK(c)] & PY_CTF_UPPER)
const unsigned int _Py_ctype_table[256] = {
    0, /* 0x0 '\x00' */
    0, /* 0x1 '\x01' */
    0, /* 0x2 '\x02' */
    0, /* 0x3 '\x03' */
    0, /* 0x4 '\x04' */
    0, /* 0x5 '\x05' */
    0, /* 0x6 '\x06' */
    0, /* 0x7 '\x07' */
    0, /* 0x8 '\x08' */
    PY_CTF_SPACE, /* 0x9 '\t' */
    PY_CTF_SPACE, /* 0xa '\n' */
    PY_CTF_SPACE, /* 0xb '\v' */
    PY_CTF_SPACE, /* 0xc '\f' */
    PY_CTF_SPACE, /* 0xd '\r' */
    0, /* 0xe '\x0e' */
    0, /* 0xf '\x0f' */
    0, /* 0x10 '\x10' */
    0, /* 0x11 '\x11' */
    0, /* 0x12 '\x12' */
    0, /* 0x13 '\x13' */
    0, /* 0x14 '\x14' */
    0, /* 0x15 '\x15' */
    0, /* 0x16 '\x16' */
    0, /* 0x17 '\x17' */
    0, /* 0x18 '\x18' */
    0, /* 0x19 '\x19' */
    0, /* 0x1a '\x1a' */
    0, /* 0x1b '\x1b' */
    0, /* 0x1c '\x1c' */
    0, /* 0x1d '\x1d' */
    0, /* 0x1e '\x1e' */
    0, /* 0x1f '\x1f' */
    PY_CTF_SPACE, /* 0x20 ' ' */
    0, /* 0x21 '!' */
    0, /* 0x22 '"' */
    0, /* 0x23 '#' */
    0, /* 0x24 '$' */
    0, /* 0x25 '%' */
    0, /* 0x26 '&' */
    0, /* 0x27 "'" */
    0, /* 0x28 '(' */
    0, /* 0x29 ')' */
    0, /* 0x2a '*' */
    0, /* 0x2b '+' */
    0, /* 0x2c ',' */
    0, /* 0x2d '-' */
    0, /* 0x2e '.' */
    0, /* 0x2f '/' */
    PY_CTF_DIGIT|PY_CTF_XDIGIT, /* 0x30 '0' */
    PY_CTF_DIGIT|PY_CTF_XDIGIT, /* 0x31 '1' */
    PY_CTF_DIGIT|PY_CTF_XDIGIT, /* 0x32 '2' */
    PY_CTF_DIGIT|PY_CTF_XDIGIT, /* 0x33 '3' */
    PY_CTF_DIGIT|PY_CTF_XDIGIT, /* 0x34 '4' */
    PY_CTF_DIGIT|PY_CTF_XDIGIT, /* 0x35 '5' */
    PY_CTF_DIGIT|PY_CTF_XDIGIT, /* 0x36 '6' */
    PY_CTF_DIGIT|PY_CTF_XDIGIT, /* 0x37 '7' */
    PY_CTF_DIGIT|PY_CTF_XDIGIT, /* 0x38 '8' */
    PY_CTF_DIGIT|PY_CTF_XDIGIT, /* 0x39 '9' */
    0, /* 0x3a ':' */
    0, /* 0x3b ';' */
    0, /* 0x3c '<' */
    0, /* 0x3d '=' */
    0, /* 0x3e '>' */
    0, /* 0x3f '?' */
    0, /* 0x40 '@' */
    PY_CTF_UPPER|PY_CTF_XDIGIT, /* 0x41 'A' */
    PY_CTF_UPPER|PY_CTF_XDIGIT, /* 0x42 'B' */
    PY_CTF_UPPER|PY_CTF_XDIGIT, /* 0x43 'C' */
    PY_CTF_UPPER|PY_CTF_XDIGIT, /* 0x44 'D' */
    PY_CTF_UPPER|PY_CTF_XDIGIT, /* 0x45 'E' */
    PY_CTF_UPPER|PY_CTF_XDIGIT, /* 0x46 'F' */
    PY_CTF_UPPER, /* 0x47 'G' */
    PY_CTF_UPPER, /* 0x48 'H' */
    PY_CTF_UPPER, /* 0x49 'I' */
    PY_CTF_UPPER, /* 0x4a 'J' */
    PY_CTF_UPPER, /* 0x4b 'K' */
    PY_CTF_UPPER, /* 0x4c 'L' */
    PY_CTF_UPPER, /* 0x4d 'M' */
    PY_CTF_UPPER, /* 0x4e 'N' */
    PY_CTF_UPPER, /* 0x4f 'O' */
    PY_CTF_UPPER, /* 0x50 'P' */
    PY_CTF_UPPER, /* 0x51 'Q' */
    PY_CTF_UPPER, /* 0x52 'R' */
    PY_CTF_UPPER, /* 0x53 'S' */
    PY_CTF_UPPER, /* 0x54 'T' */
    PY_CTF_UPPER, /* 0x55 'U' */
    PY_CTF_UPPER, /* 0x56 'V' */
    PY_CTF_UPPER, /* 0x57 'W' */
    PY_CTF_UPPER, /* 0x58 'X' */
    PY_CTF_UPPER, /* 0x59 'Y' */
    PY_CTF_UPPER, /* 0x5a 'Z' */
    0, /* 0x5b '[' */
    0, /* 0x5c '\\' */
    0, /* 0x5d ']' */
    0, /* 0x5e '^' */
    0, /* 0x5f '_' */
    0, /* 0x60 '`' */
    PY_CTF_LOWER|PY_CTF_XDIGIT, /* 0x61 'a' */
    PY_CTF_LOWER|PY_CTF_XDIGIT, /* 0x62 'b' */
    PY_CTF_LOWER|PY_CTF_XDIGIT, /* 0x63 'c' */
    PY_CTF_LOWER|PY_CTF_XDIGIT, /* 0x64 'd' */
    PY_CTF_LOWER|PY_CTF_XDIGIT, /* 0x65 'e' */
    PY_CTF_LOWER|PY_CTF_XDIGIT, /* 0x66 'f' */
    PY_CTF_LOWER, /* 0x67 'g' */
    PY_CTF_LOWER, /* 0x68 'h' */
    PY_CTF_LOWER, /* 0x69 'i' */
    PY_CTF_LOWER, /* 0x6a 'j' */
    PY_CTF_LOWER, /* 0x6b 'k' */
    PY_CTF_LOWER, /* 0x6c 'l' */
    PY_CTF_LOWER, /* 0x6d 'm' */
    PY_CTF_LOWER, /* 0x6e 'n' */
    PY_CTF_LOWER, /* 0x6f 'o' */
    PY_CTF_LOWER, /* 0x70 'p' */
    PY_CTF_LOWER, /* 0x71 'q' */
    PY_CTF_LOWER, /* 0x72 'r' */
    PY_CTF_LOWER, /* 0x73 's' */
    PY_CTF_LOWER, /* 0x74 't' */
    PY_CTF_LOWER, /* 0x75 'u' */
    PY_CTF_LOWER, /* 0x76 'v' */
    PY_CTF_LOWER, /* 0x77 'w' */
    PY_CTF_LOWER, /* 0x78 'x' */
    PY_CTF_LOWER, /* 0x79 'y' */
    PY_CTF_LOWER, /* 0x7a 'z' */
    0, /* 0x7b '{' */
    0, /* 0x7c '|' */
    0, /* 0x7d '}' */
    0, /* 0x7e '~' */
    0, /* 0x7f '\x7f' */
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};

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