/*
* raptor_turtle_emit_literal:
* @serializer: #raptor_serializer object
* @node: literal node
* @depth: depth into tree
*
* Emit a description of a literal (object).
*
* Return value: non-0 on failure
**/
static int
raptor_turtle_emit_literal(raptor_serializer *serializer,
raptor_abbrev_node* node,
int depth)
{
raptor_turtle_context* context=(raptor_turtle_context*)serializer->context;
raptor_turtle_writer *turtle_writer = context->turtle_writer;
int rc=0;
RAPTOR_DEBUG5("Emitting literal node %p refcount %d subject %d object %d\n",
node,
node->ref_count, node->count_as_subject, node->count_as_object);
if(node->type != RAPTOR_IDENTIFIER_TYPE_LITERAL)
return 1;
rc=raptor_turtle_writer_literal(turtle_writer, context->nstack,
node->value.literal.string,
node->value.literal.language,
node->value.literal.datatype);
RAPTOR_DEBUG2("Emitted %p\n", node);
return rc;
}
/*
* raptor_turtle_emit_xml_literal:
* @serializer: #raptor_serializer object
* @node: XML literal node
* @depth: depth into tree
*
* Emit a description of a literal using an XML Element
*
* Return value: non-0 on failure
**/
static int
raptor_turtle_emit_xml_literal(raptor_serializer *serializer,
raptor_abbrev_node* node,
int depth)
{
raptor_turtle_context* context=(raptor_turtle_context*)serializer->context;
raptor_turtle_writer *turtle_writer = context->turtle_writer;
raptor_uri* type_uri;
int rc=0;
RAPTOR_DEBUG5("Emitting XML literal node %p refcount %d subject %d object %d\n",
node,
node->ref_count, node->count_as_subject, node->count_as_object);
if(node->type != RAPTOR_IDENTIFIER_TYPE_XML_LITERAL)
return 1;
type_uri = raptor_new_uri_v2(serializer->world, (const unsigned char*)
"http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral");
rc=raptor_turtle_writer_literal(turtle_writer, context->nstack,
node->value.literal.string, NULL, type_uri);
raptor_free_uri_v2(serializer->world, type_uri);
return rc;
}
/*
* raptor_turtle_emit_resource:
* @serializer: #raptor_serializer object
* @node: resource node
* @depth: depth into tree
*
* Emit a description of a resource using an XML Element
*
* Return value: non-0 on failure
**/
static int
raptor_turtle_emit_resource(raptor_serializer *serializer,
raptor_abbrev_node* node,
int depth)
{
raptor_turtle_context* context=(raptor_turtle_context*)serializer->context;
raptor_turtle_writer *turtle_writer = context->turtle_writer;
raptor_qname* qname = NULL;
RAPTOR_DEBUG5("Emitting resource node %p refcount %d subject %d object %d\n",
node,
node->ref_count, node->count_as_subject, node->count_as_object);
if(node->type != RAPTOR_IDENTIFIER_TYPE_RESOURCE)
return 1;
qname = raptor_namespaces_qname_from_uri(context->nstack,
node->value.resource.uri, 10);
if(qname) {
raptor_turtle_writer_qname(turtle_writer, qname);
raptor_free_qname(qname);
} else {
raptor_turtle_writer_reference(turtle_writer, node->value.resource.uri);
}
RAPTOR_DEBUG2("Emitted %p\n", node);
return 0;
}
/*
* raptor_turtle_emit_subject_list_items:
* @serializer: #raptor_serializer object
* @subject: subject node
* @depth: depth into tree
*
* Emit an rdf list of items (rdf:li) about a subject node.
*
* Return value: non-0 on failure
**/
static int
raptor_turtle_emit_subject_list_items(raptor_serializer* serializer,
raptor_abbrev_subject* subject,
int depth)
{
int rv = 0;
int i=0;
RAPTOR_DEBUG5("Emitting subject list items for node %p refcount %d subject %d object %d\n",
subject->node,
subject->node->ref_count, subject->node->count_as_subject,
subject->node->count_as_object);
while(!rv && i < raptor_sequence_size(subject->list_items)) {
raptor_abbrev_node* object;
object = (raptor_abbrev_node*)raptor_sequence_get_at(subject->list_items,
i++);
if(!object)
continue;
switch(object->type) {
case RAPTOR_IDENTIFIER_TYPE_RESOURCE:
rv = raptor_turtle_emit_resource(serializer, object, depth+1);
break;
case RAPTOR_IDENTIFIER_TYPE_LITERAL:
rv = raptor_turtle_emit_literal(serializer, object, depth+1);
break;
case RAPTOR_IDENTIFIER_TYPE_XML_LITERAL:
rv = raptor_turtle_emit_xml_literal(serializer, object, depth+1);
break;
case RAPTOR_IDENTIFIER_TYPE_ANONYMOUS:
rv = raptor_turtle_emit_blank(serializer, object, depth+1);
break;
case RAPTOR_IDENTIFIER_TYPE_ORDINAL:
/* ordinals should never appear as an object with current parsers */
case RAPTOR_IDENTIFIER_TYPE_PREDICATE:
/* predicates should never appear as an object */
case RAPTOR_IDENTIFIER_TYPE_UNKNOWN:
default:
RAPTOR_FATAL1("Unsupported identifier type\n");
break;
}
}
return rv;
}
/*
* raptor_turtle_emit_subject_list_items:
* @serializer: #raptor_serializer object
* @subject: subject node
* @depth: depth into tree
*
* Emit an rdf list of items (rdf:li) about a subject node.
*
* Return value: non-0 on failure
**/
static int
raptor_turtle_emit_subject_list_items(raptor_serializer* serializer,
raptor_abbrev_subject* subject,
int depth)
{
int rv = 0;
int i = 0;
RAPTOR_DEBUG5("Emitting subject list items for node %p refcount %d subject %d object %d\n",
subject->node,
subject->node->ref_count, subject->node->count_as_subject,
subject->node->count_as_object);
while(!rv && i < raptor_sequence_size(subject->list_items)) {
raptor_abbrev_node* object;
object = (raptor_abbrev_node*)raptor_sequence_get_at(subject->list_items,
i++);
if(!object)
continue;
switch(object->term->type) {
case RAPTOR_TERM_TYPE_URI:
rv = raptor_turtle_emit_resource(serializer, object, depth+1);
break;
case RAPTOR_TERM_TYPE_LITERAL:
rv = raptor_turtle_emit_literal(serializer, object, depth+1);
break;
case RAPTOR_TERM_TYPE_BLANK:
rv = raptor_turtle_emit_blank(serializer, object, depth+1);
break;
case RAPTOR_TERM_TYPE_UNKNOWN:
default:
raptor_log_error_formatted(serializer->world, RAPTOR_LOG_LEVEL_ERROR,
NULL, "Triple has unsupported term type %d",
object->term->type);
break;
}
}
return rv;
}
/*
* raptor_turtle_emit_blank:
* @serializer: #raptor_serializer object
* @node: blank node
* @depth: depth into tree
*
* Emit a description of a blank node
*
* Return value: non-0 on failure
**/
static int
raptor_turtle_emit_blank(raptor_serializer *serializer,
raptor_abbrev_node* node,
int depth)
{
raptor_turtle_context* context=(raptor_turtle_context*)serializer->context;
int rc=0;
RAPTOR_DEBUG5("Emitting blank node %p refcount %d subject %d object %d\n",
node,
node->ref_count, node->count_as_subject, node->count_as_object);
if(node->type != RAPTOR_IDENTIFIER_TYPE_ANONYMOUS)
return 1;
if((node->count_as_subject == 1 && node->count_as_object == 1)) {
/* If this is only used as a 1 subject and object or never
* used as a subject or never used as an object, it never need
* be referenced with an explicit name */
raptor_abbrev_subject* blank;
blank = raptor_abbrev_subject_find(context->blanks,
node->type,
node->value.blank.string);
if(blank) {
rc = raptor_turtle_emit_subject(serializer, blank, depth+1);
raptor_abbrev_subject_invalidate(blank);
}
} else {
/* Blank node that needs an explicit name */
const unsigned char *node_id = node->value.blank.string;
raptor_turtle_writer_raw(context->turtle_writer, (const unsigned char*)"_:");
raptor_turtle_writer_raw(context->turtle_writer, node_id);
}
RAPTOR_DEBUG2("Emitted %p\n", node);
return rc;
}
/*
* raptor_turtle_emit_resource:
* @serializer: #raptor_serializer object
* @node: resource node
* @depth: depth into tree
*
* Emit a description of a resource using an XML Element
*
* Return value: non-0 on failure
**/
static int
raptor_turtle_emit_resource(raptor_serializer *serializer,
raptor_abbrev_node* node,
int depth)
{
raptor_turtle_context* context = (raptor_turtle_context*)serializer->context;
raptor_turtle_writer *turtle_writer = context->turtle_writer;
raptor_qname* qname = NULL;
RAPTOR_DEBUG5("Emitting resource node %p refcount %d subject %d object %d\n",
node,
node->ref_count, node->count_as_subject, node->count_as_object);
if(node->term->type != RAPTOR_TERM_TYPE_URI)
return 1;
qname = raptor_new_qname_from_namespace_uri(context->nstack,
node->term->value.uri, 10);
/* XML Names allow leading '_' and '.' anywhere but Turtle does not */
if(qname && !raptor_turtle_is_legal_turtle_qname(qname)) {
raptor_free_qname(qname);
qname = NULL;
}
if(qname) {
raptor_turtle_writer_qname(turtle_writer, qname);
raptor_free_qname(qname);
} else {
raptor_turtle_writer_reference(turtle_writer, node->term->value.uri);
}
RAPTOR_DEBUG2("Emitted %p\n", node);
return 0;
}
/*
* raptor_turtle_emit_subject:
* @serializer: #raptor_serializer object
* @subject: subject node
* @depth: depth into tree
*
* Emit a subject node
*
* Return value: non-0 on failure
**/
static int
raptor_turtle_emit_subject(raptor_serializer *serializer,
raptor_abbrev_subject* subject,
int depth)
{
raptor_turtle_context* context=(raptor_turtle_context*)serializer->context;
raptor_turtle_writer* turtle_writer=context->turtle_writer;
int blank = 1;
int collection = 0;
int rc = 0;
if (!raptor_abbrev_subject_valid(subject)) return 0;
RAPTOR_DEBUG5("Emitting subject node %p refcount %d subject %d object %d\n",
subject->node,
subject->node->ref_count,
subject->node->count_as_subject,
subject->node->count_as_object);
if(!depth &&
subject->node->type == RAPTOR_IDENTIFIER_TYPE_ANONYMOUS &&
subject->node->count_as_subject == 1 &&
subject->node->count_as_object == 1) {
RAPTOR_DEBUG2("Skipping subject node %p\n", subject->node);
return 0;
}
if(raptor_avltree_size(subject->properties) == 0) {
RAPTOR_DEBUG2("Skipping subject node %p\n", subject->node);
return 0;
}
/* check if we can do collection abbreviation */
if(raptor_avltree_size(subject->properties) >= 2) {
raptor_avltree_iterator* iter=NULL;
raptor_abbrev_node* pred1;
raptor_abbrev_node* pred2;
iter=raptor_new_avltree_iterator(subject->properties, NULL, NULL, 1);
if(!iter)
return 1;
pred1=((raptor_abbrev_node**)raptor_avltree_iterator_get(iter))[0];
raptor_avltree_iterator_next(iter);
pred2=((raptor_abbrev_node**)raptor_avltree_iterator_get(iter))[0];
raptor_free_avltree_iterator(iter);
if(pred1->type == RAPTOR_IDENTIFIER_TYPE_RESOURCE &&
pred2->type == RAPTOR_IDENTIFIER_TYPE_RESOURCE &&
(
(raptor_uri_equals_v2(serializer->world, pred1->value.resource.uri, context->rdf_first_uri) &&
raptor_uri_equals_v2(serializer->world, pred2->value.resource.uri, context->rdf_rest_uri))
||
(raptor_uri_equals_v2(serializer->world, pred2->value.resource.uri, context->rdf_first_uri) &&
raptor_uri_equals_v2(serializer->world, pred1->value.resource.uri, context->rdf_rest_uri))
)
) {
collection = 1;
}
}
/* emit the subject node */
if(subject->node->type == RAPTOR_IDENTIFIER_TYPE_RESOURCE) {
rc= raptor_turtle_emit_resource(serializer, subject->node, depth+1);
if(rc)
return rc;
blank = 0;
} else if(subject->node->type == RAPTOR_IDENTIFIER_TYPE_ANONYMOUS) {
if((subject->node->count_as_subject == 1 &&
subject->node->count_as_object == 0) && depth > 1) {
blank = 1;
} else if(subject->node->count_as_object == 0) {
raptor_turtle_writer_raw(turtle_writer, (const unsigned char*)"[]");
blank = 0;
} else if(!collection && subject->node->count_as_object > 1) {
/* Referred to (used as an object), so needs a nodeID */
const unsigned char* genid = subject->node->value.blank.string;
size_t len = strlen((const char*)genid);
unsigned char* subject_str;
subject_str= (unsigned char *)RAPTOR_MALLOC(cstring, len+3);
if(!subject_str)
return 1;
subject_str[0]='_';
subject_str[1]=':';
strncpy((char*)&subject_str[2], (const char*)genid, len+1);
raptor_turtle_writer_raw(turtle_writer, subject_str);
RAPTOR_FREE(cstring, subject_str);
}
} else if(subject->node->type == RAPTOR_IDENTIFIER_TYPE_ORDINAL) {
unsigned char* subject_str;
subject_str = (unsigned char *)RAPTOR_MALLOC(string,
raptor_rdf_namespace_uri_len + MAX_ASCII_INT_SIZE + 2);
if(!subject_str)
return 1;
sprintf((char*)subject, "%s_%d", raptor_rdf_namespace_uri,
subject->node->value.ordinal.ordinal);
raptor_turtle_writer_raw(turtle_writer, subject_str);
RAPTOR_FREE(cstring, subject_str);
return blank = 0;
}
if(collection) {
raptor_turtle_writer_raw(turtle_writer, (const unsigned char*)"(");
raptor_turtle_writer_increase_indent(turtle_writer);
rc=raptor_turtle_emit_subject_collection_items(serializer, subject, depth+1);
raptor_turtle_writer_decrease_indent(turtle_writer);
raptor_turtle_writer_newline(turtle_writer);
raptor_turtle_writer_raw(turtle_writer, (const unsigned char*)")");
} else {
if(blank && depth > 1)
raptor_turtle_writer_raw(turtle_writer, (const unsigned char*)"[");
raptor_turtle_writer_increase_indent(turtle_writer);
raptor_turtle_writer_newline(turtle_writer);
raptor_turtle_emit_subject_properties(serializer, subject, depth+1);
raptor_turtle_writer_decrease_indent(turtle_writer);
if(blank && depth > 1) {
raptor_turtle_writer_newline(turtle_writer);
raptor_turtle_writer_raw(turtle_writer, (const unsigned char*)"]");
}
}
if(depth == 0) {
/* NOTE: the space before the . here MUST be there or statements
* that end in a numeric literal will be interpreted incorrectly
* (the "." will be parsed as part of the literal and statement
* left unterminated)
*/
raptor_turtle_writer_raw(turtle_writer, (const unsigned char*)" .");
raptor_turtle_writer_newline(turtle_writer);
raptor_turtle_writer_newline(turtle_writer);
}
return rc;
}
/*
* raptor_turtle_emit_subject_properties:
* @serializer: #raptor_serializer object
* @subject: subject node
* @depth: depth into tree
*
* Emit the properties about a subject node.
*
* Return value: non-0 on failure
**/
static int
raptor_turtle_emit_subject_properties(raptor_serializer* serializer,
raptor_abbrev_subject* subject,
int depth)
{
raptor_turtle_context* context=(raptor_turtle_context*)serializer->context;
raptor_turtle_writer *turtle_writer = context->turtle_writer;
raptor_abbrev_node* last_predicate=NULL;
int rv = 0;
raptor_avltree_iterator* iter=NULL;
int i;
RAPTOR_DEBUG5("Emitting subject properties for node %p refcount %d subject %d object %d\n",
subject->node, subject->node->ref_count,
subject->node->count_as_subject,
subject->node->count_as_object);
/* Emit any rdf:_n properties collected */
if(raptor_sequence_size(subject->list_items) > 0)
rv = raptor_turtle_emit_subject_list_items(serializer, subject, depth+1);
for(i=0, (iter=raptor_new_avltree_iterator(subject->properties, NULL, NULL, 1));
iter && !rv;
i++, (rv=raptor_avltree_iterator_next(iter))) {
raptor_abbrev_node** nodes;
raptor_abbrev_node* predicate;
raptor_abbrev_node* object;
raptor_qname *qname;
nodes=(raptor_abbrev_node**)raptor_avltree_iterator_get(iter);
if(!nodes)
break;
predicate= nodes[0];
object= nodes[1];
if(!(last_predicate && raptor_abbrev_node_equals(predicate, last_predicate))) {
/* no object list abbreviation possible, terminate last object */
if(last_predicate) {
raptor_turtle_writer_raw(turtle_writer, (const unsigned char*)" ;");
raptor_turtle_writer_newline(turtle_writer);
}
if(predicate->type == RAPTOR_IDENTIFIER_TYPE_ORDINAL) {
/* we should only get here in rare cases -- usually when there
* are multiple ordinals with the same value. */
unsigned char uri_string[MAX_ASCII_INT_SIZE + 2];
sprintf((char*)uri_string, "_%d", predicate->value.ordinal.ordinal);
qname = raptor_new_qname_from_namespace_local_name_v2(serializer->world,
context->rdf_nspace,
uri_string,
NULL);
} else {
qname = raptor_namespaces_qname_from_uri(context->nstack,
predicate->value.resource.uri, 10);
}
if(raptor_abbrev_node_equals(predicate, context->rdf_type))
raptor_turtle_writer_raw(turtle_writer, (const unsigned char*)"a");
else if(qname)
raptor_turtle_writer_qname(turtle_writer, qname);
else
raptor_turtle_writer_reference(turtle_writer, predicate->value.resource.uri);
raptor_turtle_writer_raw(turtle_writer, (const unsigned char*)" ");
if(qname)
raptor_free_qname(qname);
} else
raptor_turtle_writer_raw(turtle_writer, (const unsigned char*)", ");
switch(object->type) {
case RAPTOR_IDENTIFIER_TYPE_RESOURCE:
rv = raptor_turtle_emit_resource(serializer, object, depth+1);
break;
case RAPTOR_IDENTIFIER_TYPE_LITERAL:
rv = raptor_turtle_emit_literal(serializer, object, depth+1);
break;
case RAPTOR_IDENTIFIER_TYPE_ANONYMOUS:
rv = raptor_turtle_emit_blank(serializer, object, depth+1);
break;
case RAPTOR_IDENTIFIER_TYPE_XML_LITERAL:
rv = raptor_turtle_emit_xml_literal(serializer, object, depth+1);
break;
case RAPTOR_IDENTIFIER_TYPE_ORDINAL:
/* ordinals should never appear as an object with current parsers */
case RAPTOR_IDENTIFIER_TYPE_PREDICATE:
/* predicates should never appear as an object */
case RAPTOR_IDENTIFIER_TYPE_UNKNOWN:
default:
RAPTOR_FATAL1("Unsupported identifier type\n");
break;
}
last_predicate = predicate;
}
if (iter)
raptor_free_avltree_iterator(iter);
return rv;
}
/*
* raptor_turtle_emit_subject_collection_items:
* @serializer: #raptor_serializer object
* @subject: subject node
* @depth: depth into tree
*
* Emit an abbreviated rdf collection of items (rdf:first, rdf:rest) about a subject node.
*
* Return value: non-0 on failure
**/
static int
raptor_turtle_emit_subject_collection_items(raptor_serializer* serializer,
raptor_abbrev_subject* subject,
int depth)
{
raptor_turtle_context* context=(raptor_turtle_context*)serializer->context;
int rv = 0;
raptor_avltree_iterator* iter=NULL;
int i;
int is_new_subject = 0;
RAPTOR_DEBUG5("Emitting subject collection items for node %p refcount %d subject %d object %d\n",
subject->node,
subject->node->ref_count, subject->node->count_as_subject,
subject->node->count_as_object);
/* if just saw a new subject (is_new_subject is true) then there is no need
* to advance the iterator - it was just reset
*/
for(i=0, (iter=raptor_new_avltree_iterator(subject->properties, NULL, NULL, 1));
iter && !rv;
i++, (rv = is_new_subject ? 0 : raptor_avltree_iterator_next(iter))) {
raptor_abbrev_node** nodes;
raptor_abbrev_node* predicate;
raptor_abbrev_node* object;
is_new_subject = 0;
nodes=(raptor_abbrev_node**)raptor_avltree_iterator_get(iter);
if(!nodes)
break;
predicate= nodes[0];
object= nodes[1];
if(!raptor_uri_equals_v2(serializer->world,
predicate->value.resource.uri,
context->rdf_first_uri)) {
raptor_serializer_error(serializer,
"Malformed collection - first predicate is not rdf:first");
return 1;
}
if(!object)
continue;
if(i > 0)
raptor_turtle_writer_newline(context->turtle_writer);
switch(object->type) {
case RAPTOR_IDENTIFIER_TYPE_RESOURCE:
rv = raptor_turtle_emit_resource(serializer, object, depth+1);
break;
case RAPTOR_IDENTIFIER_TYPE_LITERAL:
rv = raptor_turtle_emit_literal(serializer, object, depth+1);
break;
case RAPTOR_IDENTIFIER_TYPE_XML_LITERAL:
rv = raptor_turtle_emit_xml_literal(serializer, object, depth+1);
break;
case RAPTOR_IDENTIFIER_TYPE_ANONYMOUS:
rv = raptor_turtle_emit_blank(serializer, object, depth+1);
break;
case RAPTOR_IDENTIFIER_TYPE_ORDINAL:
/* ordinals should never appear as an object with current parsers */
case RAPTOR_IDENTIFIER_TYPE_PREDICATE:
/* predicates should never appear as an object */
case RAPTOR_IDENTIFIER_TYPE_UNKNOWN:
default:
RAPTOR_FATAL1("Unsupported identifier type\n");
break;
}
/* last item */
rv=raptor_avltree_iterator_next(iter);
if(rv)
break;
nodes=(raptor_abbrev_node**)raptor_avltree_iterator_get(iter);
predicate = nodes[0];
object = nodes[1];
if(!raptor_uri_equals_v2(serializer->world, predicate->value.resource.uri, context->rdf_rest_uri)) {
raptor_serializer_error(serializer,
"Malformed collection - second predicate is not rdf:rest");
return 1;
}
if(object->type == RAPTOR_IDENTIFIER_TYPE_ANONYMOUS) {
subject = raptor_abbrev_subject_find(context->blanks, object->type,
object->value.blank.string);
if(!subject) {
raptor_serializer_error(serializer,
"Malformed collection - could not find subject for rdf:rest");
return 1;
}
/* got a <(old)subject> rdf:rest <(new)subject> triple so know
* subject has changed and should reset the properties iterator
*/
if(iter)
raptor_free_avltree_iterator(iter);
iter = raptor_new_avltree_iterator(subject->properties, NULL, NULL, 1);
is_new_subject = 1;
} else {
if(object->type != RAPTOR_IDENTIFIER_TYPE_RESOURCE ||
!raptor_uri_equals_v2(serializer->world, object->value.resource.uri, context->rdf_nil_uri)) {
raptor_serializer_error(serializer,
"Malformed collection - last rdf:rest resource is not rdf:nil");
return 1;
}
break;
}
}
if(iter)
raptor_free_avltree_iterator(iter);
return rv;
}
/*
* raptor_turtle_emit_subject_properties:
* @serializer: #raptor_serializer object
* @subject: subject node
* @depth: depth into tree
*
* Emit the properties about a subject node.
*
* Return value: non-0 on failure
**/
static int
raptor_turtle_emit_subject_properties(raptor_serializer* serializer,
raptor_abbrev_subject* subject,
int depth)
{
raptor_turtle_context* context = (raptor_turtle_context*)serializer->context;
raptor_turtle_writer *turtle_writer = context->turtle_writer;
raptor_abbrev_node* last_predicate = NULL;
int rv = 0;
raptor_avltree_iterator* iter = NULL;
int i;
RAPTOR_DEBUG5("Emitting subject properties for node %p refcount %d subject %d object %d\n",
subject->node, subject->node->ref_count,
subject->node->count_as_subject,
subject->node->count_as_object);
/* Emit any rdf:_n properties collected */
if(raptor_sequence_size(subject->list_items) > 0)
rv = raptor_turtle_emit_subject_list_items(serializer, subject, depth+1);
for(i = 0, (iter = raptor_new_avltree_iterator(subject->properties, NULL, NULL, 1));
iter && !rv;
i++, (rv = raptor_avltree_iterator_next(iter))) {
raptor_abbrev_node** nodes;
raptor_abbrev_node* predicate;
raptor_abbrev_node* object;
raptor_qname *qname;
nodes = (raptor_abbrev_node**)raptor_avltree_iterator_get(iter);
if(!nodes)
break;
predicate= nodes[0];
object= nodes[1];
if(!(last_predicate && raptor_abbrev_node_equals(predicate, last_predicate))) {
/* no object list abbreviation possible, terminate last object */
if(last_predicate) {
raptor_turtle_writer_raw(turtle_writer, (const unsigned char*)" ;");
raptor_turtle_writer_newline(turtle_writer);
}
qname = raptor_new_qname_from_namespace_uri(context->nstack,
predicate->term->value.uri,
10);
if(raptor_abbrev_node_equals(predicate, context->rdf_type))
raptor_turtle_writer_raw(turtle_writer, (const unsigned char*)"a");
else if(qname)
raptor_turtle_writer_qname(turtle_writer, qname);
else
raptor_turtle_writer_reference(turtle_writer, predicate->term->value.uri);
raptor_turtle_writer_raw(turtle_writer, (const unsigned char*)" ");
if(qname)
raptor_free_qname(qname);
} else
raptor_turtle_writer_raw(turtle_writer, (const unsigned char*)", ");
switch(object->term->type) {
case RAPTOR_TERM_TYPE_URI:
rv = raptor_turtle_emit_resource(serializer, object, depth+1);
break;
case RAPTOR_TERM_TYPE_LITERAL:
rv = raptor_turtle_emit_literal(serializer, object, depth+1);
break;
case RAPTOR_TERM_TYPE_BLANK:
rv = raptor_turtle_emit_blank(serializer, object, depth+1);
break;
case RAPTOR_TERM_TYPE_UNKNOWN:
default:
raptor_log_error_formatted(serializer->world, RAPTOR_LOG_LEVEL_ERROR,
NULL, "Triple has unsupported term type %d",
object->term->type);
break;
}
/* Return error if emitting something failed above */
if(rv)
return rv;
last_predicate = predicate;
}
if(iter)
raptor_free_avltree_iterator(iter);
return rv;
}
/*
* raptor_turtle_emit_subject_collection_items:
* @serializer: #raptor_serializer object
* @subject: subject node
* @depth: depth into tree
*
* Emit an abbreviated rdf collection of items (rdf:first, rdf:rest) about a subject node.
*
* Return value: non-0 on failure
**/
static int
raptor_turtle_emit_subject_collection_items(raptor_serializer* serializer,
raptor_abbrev_subject* subject,
int depth)
{
raptor_turtle_context* context = (raptor_turtle_context*)serializer->context;
int rv = 0;
raptor_avltree_iterator* iter = NULL;
int i;
int is_new_subject = 0;
RAPTOR_DEBUG5("Emitting subject collection items for node %p refcount %d subject %d object %d\n",
subject->node,
subject->node->ref_count, subject->node->count_as_subject,
subject->node->count_as_object);
/* if just saw a new subject (is_new_subject is true) then there is no need
* to advance the iterator - it was just reset
*/
for(i = 0, (iter = raptor_new_avltree_iterator(subject->properties, NULL, NULL, 1));
iter && !rv;
i++, (rv = is_new_subject ? 0 : raptor_avltree_iterator_next(iter))) {
raptor_abbrev_node** nodes;
raptor_abbrev_node* predicate;
raptor_abbrev_node* object;
is_new_subject = 0;
nodes = (raptor_abbrev_node**)raptor_avltree_iterator_get(iter);
if(!nodes)
break;
predicate= nodes[0];
object= nodes[1];
if(!raptor_uri_equals(predicate->term->value.uri,
context->rdf_first_uri)) {
raptor_log_error(serializer->world, RAPTOR_LOG_LEVEL_ERROR, NULL,
"Malformed collection - first predicate is not rdf:first");
return 1;
}
if(!object)
continue;
if(i > 0)
raptor_turtle_writer_newline(context->turtle_writer);
switch(object->term->type) {
case RAPTOR_TERM_TYPE_URI:
rv = raptor_turtle_emit_resource(serializer, object, depth+1);
break;
case RAPTOR_TERM_TYPE_LITERAL:
rv = raptor_turtle_emit_literal(serializer, object, depth+1);
break;
case RAPTOR_TERM_TYPE_BLANK:
rv = raptor_turtle_emit_blank(serializer, object, depth+1);
break;
case RAPTOR_TERM_TYPE_UNKNOWN:
default:
raptor_log_error_formatted(serializer->world, RAPTOR_LOG_LEVEL_ERROR,
NULL, "Triple has unsupported term type %d",
object->term->type);
break;
}
/* Return error if emitting something failed above */
if(rv)
return rv;
/* last item */
rv = raptor_avltree_iterator_next(iter);
if(rv)
break;
nodes = (raptor_abbrev_node**)raptor_avltree_iterator_get(iter);
predicate = nodes[0];
object = nodes[1];
if(!raptor_uri_equals(predicate->term->value.uri, context->rdf_rest_uri)) {
raptor_log_error(serializer->world, RAPTOR_LOG_LEVEL_ERROR, NULL,
"Malformed collection - second predicate is not rdf:rest");
return 1;
}
if(object->term->type == RAPTOR_TERM_TYPE_BLANK) {
subject = raptor_abbrev_subject_find(context->blanks, object->term);
if(!subject) {
raptor_log_error(serializer->world, RAPTOR_LOG_LEVEL_ERROR, NULL,
"Malformed collection - could not find subject for rdf:rest");
return 1;
}
/* got a <(old)subject> rdf:rest <(new)subject> triple so know
* subject has changed and should reset the properties iterator
*/
if(iter)
raptor_free_avltree_iterator(iter);
iter = raptor_new_avltree_iterator(subject->properties, NULL, NULL, 1);
is_new_subject = 1;
} else {
if(object->term->type != RAPTOR_TERM_TYPE_URI ||
!raptor_uri_equals(object->term->value.uri, context->rdf_nil_uri)) {
raptor_log_error(serializer->world, RAPTOR_LOG_LEVEL_ERROR, NULL,
"Malformed collection - last rdf:rest resource is not rdf:nil");
return 1;
}
break;
}
}
if(iter)
raptor_free_avltree_iterator(iter);
return rv;
}
