static nd::array array_function_dereference(const nd::array &self)
{
// Follow the pointers to eliminate them
ndt::type dt = self.get_type();
const char *arrmeta = self.get()->metadata();
char *data = self.get()->data;
memory_block_data *dataref = self.get()->owner.get();
if (dataref == NULL) {
dataref = self.get();
}
uint64_t flags = self.get()->flags;
while (dt.get_type_id() == pointer_type_id) {
const pointer_type_arrmeta *md = reinterpret_cast<const pointer_type_arrmeta *>(arrmeta);
dt = dt.extended<ndt::pointer_type>()->get_target_type();
arrmeta += sizeof(pointer_type_arrmeta);
data = *reinterpret_cast<char **>(data) + md->offset;
dataref = md->blockref.get();
}
// Create an array without the pointers
nd::array result(make_array_memory_block(dt.get_arrmeta_size()));
if (!dt.is_builtin()) {
dt.extended()->arrmeta_copy_construct(result.get()->metadata(), arrmeta, self);
}
result.get()->type = dt.release();
result.get()->data = data;
result.get()->owner = dataref;
result.get()->flags = flags;
return result;
}
static void json_as_buffer(const nd::array &json, nd::array &out_tmp_ref, const char *&begin, const char *&end)
{
// Check the type of 'json', and get pointers to the begin/end of a UTF-8
// buffer
ndt::type json_type = json.get_type().value_type();
switch (json_type.get_kind()) {
case string_kind: {
const ndt::base_string_type *sdt = json_type.extended<ndt::base_string_type>();
switch (sdt->get_encoding()) {
case string_encoding_ascii:
case string_encoding_utf_8:
out_tmp_ref = json.eval();
// The data is already UTF-8, so use the buffer directly
sdt->get_string_range(&begin, &end, out_tmp_ref.get()->metadata(), out_tmp_ref.cdata());
break;
default: {
// The data needs to be converted to UTF-8 before parsing
ndt::type utf8_tp = ndt::string_type::make();
out_tmp_ref = json.ucast(utf8_tp).eval();
sdt = static_cast<const ndt::base_string_type *>(utf8_tp.extended());
sdt->get_string_range(&begin, &end, out_tmp_ref.get()->metadata(), out_tmp_ref.cdata());
break;
}
}
break;
}
case bytes_kind: {
out_tmp_ref = json.eval();
const ndt::base_bytes_type *bdt = json_type.extended<ndt::base_bytes_type>();
bdt->get_bytes_range(&begin, &end, out_tmp_ref.get()->metadata(), out_tmp_ref.cdata());
break;
}
default: {
stringstream ss;
ss << "Input for JSON parsing must be either bytes (interpreted as UTF-8) "
"or a string, not \"" << json_type << "\"";
throw runtime_error(ss.str());
break;
}
}
}
void dynd::parse_json(nd::array &out, const char *json_begin, const char *json_end, const eval::eval_context *ectx)
{
try
{
const char *begin = json_begin, *end = json_end;
ndt::type tp = out.get_type();
::parse_json(tp, out.get()->metadata(), out.data(), begin, end, ectx);
begin = skip_whitespace(begin, end);
if (begin != end) {
throw json_parse_error(begin, "unexpected trailing JSON text", tp);
}
}
catch (const json_parse_error &e)
{
stringstream ss;
std::string line_prev, line_cur;
int line, column;
get_error_line_column(json_begin, json_end, e.get_position(), line_prev, line_cur, line, column);
ss << "Error parsing JSON at line " << line << ", column " << column << "\n";
ss << "DyND Type: " << e.get_type() << "\n";
ss << "Message: " << e.what() << "\n";
print_json_parse_error_marker(ss, line_prev, line_cur, line, column);
throw invalid_argument(ss.str());
}
catch (const parse::parse_error &e)
{
stringstream ss;
std::string line_prev, line_cur;
int line, column;
get_error_line_column(json_begin, json_end, e.get_position(), line_prev, line_cur, line, column);
ss << "Error parsing JSON at line " << line << ", column " << column << "\n";
ss << "Message: " << e.what() << "\n";
print_json_parse_error_marker(ss, line_prev, line_cur, line, column);
throw invalid_argument(ss.str());
}
}
dynd::nd::array pydynd::nd_fields(const nd::array &n, PyObject *field_list)
{
vector<std::string> selected_fields;
pyobject_as_vector_string(field_list, selected_fields);
// TODO: Move this implementation into dynd
ndt::type fdt = n.get_dtype();
if (fdt.get_kind() != struct_kind) {
stringstream ss;
ss << "nd.fields must be given a dynd array of 'struct' kind, not ";
ss << fdt;
throw runtime_error(ss.str());
}
const ndt::struct_type *bsd = fdt.extended<ndt::struct_type>();
if (selected_fields.empty()) {
throw runtime_error(
"nd.fields requires at least one field name to be specified");
}
// Construct the field mapping and output field types
vector<intptr_t> selected_index(selected_fields.size());
vector<ndt::type> selected__types(selected_fields.size());
for (size_t i = 0; i != selected_fields.size(); ++i) {
selected_index[i] = bsd->get_field_index(selected_fields[i]);
if (selected_index[i] < 0) {
stringstream ss;
ss << "field name ";
print_escaped_utf8_string(ss, selected_fields[i]);
ss << " does not exist in dynd type " << fdt;
throw runtime_error(ss.str());
}
selected__types[i] = bsd->get_field_type(selected_index[i]);
}
// Create the result udt
ndt::type rudt = ndt::struct_type::make(selected_fields, selected__types);
ndt::type result_tp = n.get_type().with_replaced_dtype(rudt);
const ndt::struct_type *rudt_bsd = rudt.extended<ndt::struct_type>();
// Allocate the new memory block.
size_t arrmeta_size = result_tp.get_arrmeta_size();
nd::array result(reinterpret_cast<array_preamble *>(
make_array_memory_block(arrmeta_size).get()),
true);
// Clone the data pointer
result.get()->data = n.get()->data;
result.get()->owner = n.get()->owner;
if (!result.get()->owner) {
result.get()->owner = n.get();
}
// Copy the flags
result.get()->flags = n.get()->flags;
// Set the type and transform the arrmeta
result.get()->tp = result_tp;
// First copy all the array data type arrmeta
ndt::type tmp_dt = result_tp;
char *dst_arrmeta = result.get()->metadata();
const char *src_arrmeta = n.get()->metadata();
while (tmp_dt.get_ndim() > 0) {
if (tmp_dt.get_kind() != dim_kind) {
throw runtime_error(
"nd.fields doesn't support dimensions with pointers yet");
}
const ndt::base_dim_type *budd = tmp_dt.extended<ndt::base_dim_type>();
size_t offset = budd->arrmeta_copy_construct_onedim(
dst_arrmeta, src_arrmeta,
intrusive_ptr<memory_block_data>(n.get(), true));
dst_arrmeta += offset;
src_arrmeta += offset;
tmp_dt = budd->get_element_type();
}
// Then create the arrmeta for the new struct
const size_t *arrmeta_offsets = bsd->get_arrmeta_offsets_raw();
const size_t *result_arrmeta_offsets = rudt_bsd->get_arrmeta_offsets_raw();
const size_t *data_offsets = bsd->get_data_offsets(src_arrmeta);
size_t *result_data_offsets = reinterpret_cast<size_t *>(dst_arrmeta);
for (size_t i = 0; i != selected_fields.size(); ++i) {
const ndt::type &dt = selected__types[i];
// Copy the data offset
result_data_offsets[i] = data_offsets[selected_index[i]];
// Copy the arrmeta for this field
if (dt.get_arrmeta_size() > 0) {
dt.extended()->arrmeta_copy_construct(
dst_arrmeta + result_arrmeta_offsets[i],
src_arrmeta + arrmeta_offsets[selected_index[i]],
intrusive_ptr<memory_block_data>(n.get(), true));
}
}
return result;
}
ndt::categorical_type::categorical_type(const nd::array &categories, bool presorted)
: base_type(categorical_id, 4, 4, type_flag_none, 0, 0, 0)
{
intptr_t category_count;
if (presorted) {
// This is construction shortcut, for the case when the categories are
// already
// sorted. No validation of this is done, the caller should have ensured it
// was correct already, typically by construction.
m_categories = categories.eval_immutable();
m_category_tp = m_categories.get_type().at(0);
category_count = categories.get_dim_size();
m_value_to_category_index = nd::range(category_count);
m_value_to_category_index.flag_as_immutable();
m_category_index_to_value = m_value_to_category_index;
}
else {
// Process the categories array to make sure it's valid
const type &cdt = categories.get_type();
if (cdt.get_id() != fixed_dim_id) {
throw dynd::type_error("categorical_type only supports construction from "
"a fixed-dim array of categories");
}
m_category_tp = categories.get_type().at(0);
if (!m_category_tp.is_scalar()) {
throw dynd::type_error("categorical_type only supports construction from "
"a 1-dimensional strided array of categories");
}
category_count = categories.get_dim_size();
intptr_t categories_stride = reinterpret_cast<const fixed_dim_type_arrmeta *>(categories.get()->metadata())->stride;
const char *categories_element_arrmeta = categories.get()->metadata() + sizeof(fixed_dim_type_arrmeta);
nd::kernel_builder k;
kernel_single_t fn = k.get()->get_function<kernel_single_t>();
cmp less(fn, k.get());
set<const char *, cmp> uniques(less);
m_value_to_category_index = nd::empty(category_count, make_type<intptr_t>());
m_category_index_to_value = nd::empty(category_count, make_type<intptr_t>());
// create the mapping from indices of (to be lexicographically sorted)
// categories to values
for (size_t i = 0; i != (size_t)category_count; ++i) {
unchecked_fixed_dim_get_rw<intptr_t>(m_category_index_to_value, i) = i;
const char *category_value = categories.cdata() + i * categories_stride;
if (uniques.find(category_value) == uniques.end()) {
uniques.insert(category_value);
}
else {
stringstream ss;
ss << "categories must be unique: category value ";
m_category_tp.print_data(ss, categories_element_arrmeta, category_value);
ss << " appears more than once";
throw std::runtime_error(ss.str());
}
}
// TODO: Putting everything in a set already caused a sort operation to
// occur,
// there's no reason we should need a second sort.
std::sort(&unchecked_fixed_dim_get_rw<intptr_t>(m_category_index_to_value, 0),
&unchecked_fixed_dim_get_rw<intptr_t>(m_category_index_to_value, category_count),
sorter(categories.cdata(), categories_stride, fn, k.get()));
// invert the m_category_index_to_value permutation
for (intptr_t i = 0; i < category_count; ++i) {
unchecked_fixed_dim_get_rw<intptr_t>(m_value_to_category_index,
unchecked_fixed_dim_get<intptr_t>(m_category_index_to_value, i)) = i;
}
m_categories = make_sorted_categories(uniques, m_category_tp, categories_element_arrmeta);
}
// Use the number of categories to set which underlying integer storage to use
if (category_count <= 256) {
m_storage_type = make_type<uint8_t>();
}
else if (category_count <= 65536) {
m_storage_type = make_type<uint16_t>();
}
else {
m_storage_type = make_type<uint32_t>();
}
this->data_size = m_storage_type.get_data_size();
this->data_alignment = (uint8_t)m_storage_type.get_data_alignment();
}