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Parse Unicode string escape \u{XX...}.

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Thanks to drbo.
This commit is contained in:
Mike Pall
2015-08-29 23:58:28 +02:00
parent a3a6866d4c
commit 55c3b29f7b
3 changed files with 35 additions and 0 deletions
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27
src/lj_lex.c
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@@ -214,6 +214,33 @@ static void lex_string(LexState *ls, TValue *tv)
c += 9;
}
break;
case 'u': /* Unicode escape '\u{XX...}'. */
if (lex_next(ls) != '{') goto err_xesc;
lex_next(ls);
c = 0;
do {
c = (c << 4) | (ls->c & 15u);
if (!lj_char_isdigit(ls->c)) {
if (!lj_char_isxdigit(ls->c)) goto err_xesc;
c += 9;
}
if (c >= 0x110000) goto err_xesc; /* Out of Unicode range. */
} while (lex_next(ls) != '}');
if (c < 0x800) {
if (c < 0x80) break;
lex_save(ls, 0xc0 | (c >> 6));
} else {
if (c >= 0x10000) {
lex_save(ls, 0xf0 | (c >> 18));
lex_save(ls, 0x80 | ((c >> 12) & 0x3f));
} else {
if (c >= 0xd800 && c < 0xe000) goto err_xesc; /* No surrogates. */
lex_save(ls, 0xe0 | (c >> 12));
}
lex_save(ls, 0x80 | ((c >> 6) & 0x3f));
}
c = 0x80 | (c & 0x3f);
break;
case 'z': /* Skip whitespace. */
lex_next(ls);
while (lj_char_isspace(ls->c))