const HParser *init_parser(void)
{
// CORE
H_RULE (digit, h_ch_range(0x30, 0x39));
H_RULE (alpha, h_choice(h_ch_range(0x41, 0x5a), h_ch_range(0x61, 0x7a), NULL));
H_RULE (space, h_in((uint8_t *)" \t\n\r\f\v", 6));
// AUX.
H_RULE (plus, h_ch('+'));
H_RULE (slash, h_ch('/'));
H_ARULE(equals, h_ch('='));
H_ARULE(bsfdig, h_choice(alpha, digit, plus, slash, NULL));
H_ARULE(bsfdig_4bit, h_in((uint8_t *)"AEIMQUYcgkosw048", 16));
H_ARULE(bsfdig_2bit, h_in((uint8_t *)"AQgw", 4));
H_ARULE(base64_3, h_repeat_n(bsfdig, 4));
H_ARULE(base64_2, h_sequence(bsfdig, bsfdig, bsfdig_4bit, equals, NULL));
H_ARULE(base64_1, h_sequence(bsfdig, bsfdig_2bit, equals, equals, NULL));
H_ARULE(base64, h_sequence(h_many(base64_3),
h_optional(h_choice(base64_2,
base64_1, NULL)),
NULL));
H_ARULE(ws, h_many(space));
H_ARULE(document, h_sequence(ws, base64, ws, h_end_p(), NULL));
// BUG sometimes inputs that should just don't parse.
// It *seemed* to happen mostly with things like "bbbbaaaaBA==".
// Using less actions seemed to make it less likely.
return document;
}
void init_parser(void)
{
// CORE
HParser *digit = h_ch_range(0x30, 0x39);
HParser *alpha = h_choice(h_ch_range(0x41, 0x5a), h_ch_range(0x61, 0x7a), NULL);
// AUX.
HParser *plus = h_ch('+');
HParser *slash = h_ch('/');
HParser *equals = h_ch('=');
HParser *bsfdig = h_choice(alpha, digit, plus, slash, NULL);
HParser *bsfdig_4bit = h_in((uint8_t *)"AEIMQUYcgkosw048", 16);
HParser *bsfdig_2bit = h_in((uint8_t *)"AQgw", 4);
HParser *base64_3 = h_repeat_n(bsfdig, 4);
HParser *base64_2 = h_sequence(bsfdig, bsfdig, bsfdig_4bit, equals, NULL);
HParser *base64_1 = h_sequence(bsfdig, bsfdig_2bit, equals, equals, NULL);
HParser *base64 = h_sequence(h_many(base64_3),
h_optional(h_choice(base64_2,
base64_1, NULL)),
NULL);
document = h_sequence(h_whitespace(base64), h_whitespace(h_end_p()), NULL);
}
static void test_lalr_charset_lhs(void) {
HParserBackend be = PB_LALR;
HParser *p = h_many(h_choice(h_sequence(h_ch('A'), h_ch('B'), NULL),
h_in((uint8_t*)"AB",2), NULL));
// the above would abort because of an unhandled case in trying to resolve
// a conflict where an item's left-hand-side was an HCF_CHARSET.
// however, the compile should fail - the conflict cannot be resolved.
if(h_compile(p, be, NULL) == 0) {
g_test_message("LALR compile didn't detect ambiguous grammar");
// it says it compiled it - well, then it should parse it!
// (this helps us see what it thinks it should be doing.)
g_check_parse_match(p, be, "AA",2, "(u0x41 u0x41)");
g_check_parse_match(p, be, "AB",2, "((u0x41 u0x42))");
g_test_fail();
return;
}
}
