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;
}
const HParser* init_domain() {
static const HParser *domain = NULL;
if (domain)
return domain;
const HParser *letter = h_choice(h_ch_range('a', 'z'),
h_ch_range('A', 'Z'),
NULL);
const HParser *let_dig = h_choice(letter,
h_ch_range('0', '9'),
NULL);
const HParser *ldh_str = h_many1(h_choice(let_dig,
h_ch('-'),
NULL));
const HParser *label = h_attr_bool(h_sequence(letter,
h_optional(h_sequence(h_optional(ldh_str),
let_dig,
NULL)),
NULL),
validate_label);
/**
* You could write it like this ...
* HParser *indirect_subdomain = h_indirect();
* const HParser *subdomain = h_choice(label,
* h_sequence(indirect_subdomain,
* h_ch('.'),
* label,
* NULL),
* NULL);
* h_bind_indirect(indirect_subdomain, subdomain);
*
* ... but this is easier and equivalent
*/
const HParser *subdomain = h_sepBy1(label, h_ch('.'));
domain = h_choice(subdomain,
h_ch(' '),
NULL);
return domain;
}
HParser* init_domain() {
static HParser *ret = NULL;
if (ret)
return ret;
H_RULE (letter, h_choice(h_ch_range('a','z'), h_ch_range('A','Z'), NULL));
H_RULE (let_dig, h_choice(letter, h_ch_range('0','9'), NULL));
H_RULE (ldh_str, h_many1(h_choice(let_dig, h_ch('-'), NULL)));
H_VARULE(label, h_sequence(letter,
h_optional(h_sequence(h_optional(ldh_str),
let_dig,
NULL)),
NULL));
H_RULE (subdomain, h_sepBy1(label, h_ch('.')));
H_ARULE (domain, h_choice(subdomain, h_ch(' '), NULL));
ret = domain;
return ret;
}
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);
}
