static bool read_collection(SerdReader* reader, ReadContext ctx, Ref* dest) { eat_byte_safe(reader, '('); bool end = peek_delim(reader, ')'); *dest = end ? reader->rdf_nil : blank_id(reader); if (ctx.subject) { // subject predicate _:head *ctx.flags |= (end ? 0 : SERD_LIST_O_BEGIN); TRY_RET(emit_statement(reader, ctx, *dest, 0, 0)); *ctx.flags |= SERD_LIST_CONT; } else { *ctx.flags |= (end ? 0 : SERD_LIST_S_BEGIN); } if (end) { return end_collection(reader, ctx, 0, 0, true); } /* The order of node allocation here is necessarily not in stack order, so we create two nodes and recycle them throughout. */ Ref n1 = push_node_padded(reader, genid_size(reader), SERD_BLANK, "", 0); Ref n2 = 0; Ref node = n1; Ref rest = 0; ctx.subject = *dest; while (!(end = peek_delim(reader, ')'))) { // _:node rdf:first object ctx.predicate = reader->rdf_first; bool ate_dot = false; if (!read_object(reader, ctx, &ate_dot) || ate_dot) { return end_collection(reader, ctx, n1, n2, false); } if (!(end = peek_delim(reader, ')'))) { /* Give rest a new ID. Done as late as possible to ensure it is used and > IDs generated by read_object above. */ if (!rest) { rest = n2 = blank_id(reader); // First pass, push } else { set_blank_id(reader, rest, genid_size(reader)); } } // _:node rdf:rest _:rest *ctx.flags |= SERD_LIST_CONT; ctx.predicate = reader->rdf_rest; TRY_RET(emit_statement(reader, ctx, (end ? reader->rdf_nil : rest), 0, 0)); ctx.subject = rest; // _:node = _:rest rest = node; // _:rest = (old)_:node node = ctx.subject; // invariant } return end_collection(reader, ctx, n1, n2, true); }
static bool read_blank(SerdReader* reader, ReadContext ctx, bool subject, Ref* dest, bool* ate_dot) { const SerdStatementFlags old_flags = *ctx.flags; bool empty; switch (peek_byte(reader)) { case '_': return (*dest = read_BLANK_NODE_LABEL(reader, ate_dot)); case '[': eat_byte_safe(reader, '['); if ((empty = peek_delim(reader, ']'))) { *ctx.flags |= (subject) ? SERD_EMPTY_S : SERD_EMPTY_O; } else { *ctx.flags |= (subject) ? SERD_ANON_S_BEGIN : SERD_ANON_O_BEGIN; if (peek_delim(reader, '=')) { if (!(*dest = read_blankName(reader)) || !eat_delim(reader, ';')) { return false; } } } if (!*dest) { *dest = blank_id(reader); } if (ctx.subject) { TRY_RET(emit_statement(reader, ctx, *dest, 0, 0)); } ctx.subject = *dest; if (!empty) { *ctx.flags &= ~(SERD_LIST_CONT); if (!subject) { *ctx.flags |= SERD_ANON_CONT; } bool ate_dot_in_list = false; read_predicateObjectList(reader, ctx, &ate_dot_in_list); if (ate_dot_in_list) { return r_err(reader, SERD_ERR_BAD_SYNTAX, "`.' inside blank\n"); } read_ws_star(reader); if (reader->end_sink) { reader->end_sink(reader->handle, deref(reader, *dest)); } *ctx.flags = old_flags; } return (eat_byte_check(reader, ']') == ']'); case '(': return read_collection(reader, ctx, dest); default: return false; // never reached } }