%include {

/** @brief Lemon parser grammar for N-Triples.
 *
 * The `lemon' parser generator executable must be in your PATH:
 * https://sqlite.org/src/doc/trunk/doc/lemon.html
 *
 * To generate the parser, run: `lemon ${FILE}'
 */

#include "codec.h"
}

%name NTParse

%token_type { LSUP_Term * }
%token_prefix "T_"

%default_type           { void * }
%extra_argument         { LSUP_GraphIterator *it }


// Rules.

ntriplesDoc ::= triples EOF.

triples     ::= eol.
triples     ::= triple eol.
triples     ::= triples triple eol.

%type triple            { LSUP_Triple * }
%destructor triple      { LSUP_triple_free ($$); }
triple(A)   ::= ws subject(S) ws predicate(P) ws object(O) ws DOT. {
                A = LSUP_triple_new (S, P, O);
                LSUP_graph_add_iter (it, A);
            }

%type subject           { LSUP_Term * }
%destructor subject     { (void)(it); LSUP_term_free ($$); }
subject     ::= IRIREF.
subject     ::= BNODE.

%type predicate         { LSUP_Term * }
%destructor predicate   { LSUP_term_free ($$); }
predicate   ::= IRIREF.

%type object            { LSUP_Term * }
%destructor object      { LSUP_term_free ($$); }
object      ::= IRIREF.
object      ::= BNODE.
object      ::= LITERAL.

eol         ::= EOL.
eol         ::= eol EOL.

ws          ::=.
ws          ::= WS.