case '8': \
case '9':
+static bool is_universal_char_valid(utf32 const v)
+{
+ /* C11 ยง6.4.3:2 */
+ if (v < 0xA0U && v != 0x24 && v != 0x40 && v != 0x60)
+ return false;
+ if (0xD800 <= v && v <= 0xDFFF)
+ return false;
+ return true;
+}
+
+static int digit_value(utf32 digit);
+
+static utf32 parse_universal_char(unsigned const n_digits)
+{
+ utf32 v = 0;
+ for (unsigned k = n_digits; k != 0; --k) {
+ if (isxdigit(c)) {
+ v = 16 * v + digit_value(c);
+ next_char();
+ } else {
+ errorf(&lexer_pos, "short universal character name, expected %u more digits", k);
+ break;
+ }
+ }
+ if (!is_universal_char_valid(v)) {
+ errorf(&lexer_pos, "\\%c%0*X is not a valid universal character name", n_digits == 4 ? 'u' : 'U', (int)n_digits, v);
+ }
+ return v;
+}
+
+static bool is_universal_char_valid_identifier(utf32 const v)
+{
+ /* C11 Annex D.1 */
+ if ( v == 0x000A8) return true;
+ if ( v == 0x000AA) return true;
+ if ( v == 0x000AD) return true;
+ if ( v == 0x000AF) return true;
+ if (0x000B2 <= v && v <= 0x000B5) return true;
+ if (0x000B7 <= v && v <= 0x000BA) return true;
+ if (0x000BC <= v && v <= 0x000BE) return true;
+ if (0x000C0 <= v && v <= 0x000D6) return true;
+ if (0x000D8 <= v && v <= 0x000F6) return true;
+ if (0x000F8 <= v && v <= 0x000FF) return true;
+ if (0x00100 <= v && v <= 0x0167F) return true;
+ if (0x01681 <= v && v <= 0x0180D) return true;
+ if (0x0180F <= v && v <= 0x01FFF) return true;
+ if (0x0200B <= v && v <= 0x0200D) return true;
+ if (0x0202A <= v && v <= 0x0202E) return true;
+ if (0x0203F <= v && v <= 0x02040) return true;
+ if ( v == 0x02054) return true;
+ if (0x02060 <= v && v <= 0x0206F) return true;
+ if (0x02070 <= v && v <= 0x0218F) return true;
+ if (0x02460 <= v && v <= 0x024FF) return true;
+ if (0x02776 <= v && v <= 0x02793) return true;
+ if (0x02C00 <= v && v <= 0x02DFF) return true;
+ if (0x02E80 <= v && v <= 0x02FFF) return true;
+ if (0x03004 <= v && v <= 0x03007) return true;
+ if (0x03021 <= v && v <= 0x0302F) return true;
+ if (0x03031 <= v && v <= 0x0303F) return true;
+ if (0x03040 <= v && v <= 0x0D7FF) return true;
+ if (0x0F900 <= v && v <= 0x0FD3D) return true;
+ if (0x0FD40 <= v && v <= 0x0FDCF) return true;
+ if (0x0FDF0 <= v && v <= 0x0FE44) return true;
+ if (0x0FE47 <= v && v <= 0x0FFFD) return true;
+ if (0x10000 <= v && v <= 0x1FFFD) return true;
+ if (0x20000 <= v && v <= 0x2FFFD) return true;
+ if (0x30000 <= v && v <= 0x3FFFD) return true;
+ if (0x40000 <= v && v <= 0x4FFFD) return true;
+ if (0x50000 <= v && v <= 0x5FFFD) return true;
+ if (0x60000 <= v && v <= 0x6FFFD) return true;
+ if (0x70000 <= v && v <= 0x7FFFD) return true;
+ if (0x80000 <= v && v <= 0x8FFFD) return true;
+ if (0x90000 <= v && v <= 0x9FFFD) return true;
+ if (0xA0000 <= v && v <= 0xAFFFD) return true;
+ if (0xB0000 <= v && v <= 0xBFFFD) return true;
+ if (0xC0000 <= v && v <= 0xCFFFD) return true;
+ if (0xD0000 <= v && v <= 0xDFFFD) return true;
+ if (0xE0000 <= v && v <= 0xEFFFD) return true;
+ return false;
+}
+
+static bool is_universal_char_valid_identifier_start(utf32 const v)
+{
+ /* C11 Annex D.2 */
+ if (0x0300 <= v && v <= 0x036F) return false;
+ if (0x1DC0 <= v && v <= 0x1DFF) return false;
+ if (0x20D0 <= v && v <= 0x20FF) return false;
+ if (0xFE20 <= v && v <= 0xFE2F) return false;
+ return true;
+}
+
/**
* Read a symbol from the input and build
* the lexer_token.
*/
static void parse_symbol(void)
{
- obstack_1grow(&symbol_obstack, (char) c);
- next_char();
-
while (true) {
switch (c) {
DIGITS
next_char();
break;
+ case '\\':
+ next_char();
+ switch (c) {
+ {
+ unsigned n;
+ case 'U': n = 8; goto universal;
+ case 'u': n = 4; goto universal;
+universal:
+ next_char();
+ utf32 const v = parse_universal_char(n);
+ if (!is_universal_char_valid_identifier(v)) {
+ if (is_universal_char_valid(v)) {
+ errorf(&lexer_pos, "universal character \\%c%0*X is not valid in an identifier", n == 4 ? 'u' : 'U', (int)n, v);
+ }
+ } else if (obstack_object_size(&symbol_obstack) == 0 && !is_universal_char_valid_identifier_start(v)) {
+ errorf(&lexer_pos, "universal character \\%c%0*X is not valid as start of an identifier", n == 4 ? 'u' : 'U', (int)n, v);
+ } else {
+ obstack_grow_symbol(&symbol_obstack, v);
+ }
+ break;
+ }
+
+ default:
+ put_back(c);
+ c = '\\';
+ goto end_symbol;
+ }
+
default:
dollar_sign:
goto end_symbol;
if (c_mode & _GNUC)
return 27; /* hopefully 27 is ALWAYS the code for ESCAPE */
break;
- case 'u':
- case 'U':
- parse_error("universal character parsing not implemented yet");
- return EOF;
+
+ case 'U': return parse_universal_char(8);
+ case 'u': return parse_universal_char(4);
+
default:
break;
}
MAYBE('#', T_HASHHASH)
ELSE('#')
+ case '\\':
+ next_char();
+ if (c == 'U' || c == 'u') {
+ put_back(c);
+ c = '\\';
+ parse_symbol();
+ } else {
+ lexer_token.kind = '\\';
+ }
+ return;
+
case '?':
case '[':
case ']':
case '~':
case ';':
case ',':
- case '\\':
lexer_token.kind = c;
next_char();
return;
projects / cparser / blobdiff