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Add Unicode escapes of form \u{ABC} or \U{ABC}

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This commit is contained in:
Demetrios Obenour 2015-08-27 20:38:36 -04:00
parent ad29314c2c
commit 97328c0fe7
1 changed files with 34 additions and 0 deletions
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34
src/lj_lex.c
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@ -214,6 +214,40 @@ static void lex_string(LexState *ls, TValue *tv)
c += 9;
}
break;
case 'u':
case 'U': /* Unicode escape '\u{XXXX}' or '\U{XXXX}'. */
c = 0;
if (!('{' == lex_next(ls))) goto err_xesc;
lex_next(ls);
do {
c <<= 4; /* OK to shift 0 left -- has no effect */
c += (ls->c) & 15u;
if (!lj_char_isdigit(ls->c)) {
if (!lj_char_isxdigit(ls->c)) goto err_xesc;
c += 9;
}
if (c > 0x10FFFFu) goto err_xesc; /* Unicode escape too large */
} while (lex_next(ls) != '}');
if (0xD800 <= c && c <= 0xDFFF) goto err_xesc; /* Surrogate chars not allowed */
if (c > 0xFFFFu) {
lex_save(ls, 0xF0u | (c >> 18));
c &= 0x3FFFF; /* 18 bits */
lex_save(ls, 0x80 | (c >> 12));
goto bits12;
}
else if (c > 0x7FFu) {
lex_save(ls, 0xE0u | (c >> 12));
bits12:
c &= 0xFFFu;
lex_save(ls, 0x80 | (c >> 6));
goto bits6;
}
else if (c > 0x7Fu) {
lex_save(ls, 0xC0u | (c >> 6));
bits6:
c = 0x80 | (c & 0x3Fu);
}
break;
case 'z': /* Skip whitespace. */
lex_next(ls);
while (lj_char_isspace(ls->c))