ndt::type dynd::ndt::factor_categorical(const nd::array& values)
{
// Do the factor operation on a concrete version of the values
// TODO: Some cases where we don't want to do this?
nd::array values_eval = values.eval();
array_iter<0, 1> iter(values_eval);
comparison_ckernel_builder k;
::make_comparison_kernel(&k, 0,
iter.get_uniform_dtype(), iter.arrmeta(),
iter.get_uniform_dtype(), iter.arrmeta(),
comparison_type_sorting_less, &eval::default_eval_context);
cmp less(k.get_function(), k.get());
set<const char *, cmp> uniques(less);
if (!iter.empty()) {
do {
if (uniques.find(iter.data()) == uniques.end()) {
uniques.insert(iter.data());
}
} while (iter.next());
}
// Copy the values (now sorted and unique) into a new nd::array
nd::array categories = make_sorted_categories(uniques,
iter.get_uniform_dtype(), iter.arrmeta());
return ndt::type(new categorical_type(categories, true), false);
}
nd::array dynd::format_json(const nd::array &n, bool struct_as_list)
{
// Create a UTF-8 string
nd::array result = nd::empty(ndt::string_type::make());
// Initialize the output with some memory
output_data out;
out.out_string.resize(1024);
out.out_begin = out.out_string.begin();
out.out_capacity_end = out.out_string.end();
out.out_end = out.out_begin;
out.struct_as_list = struct_as_list;
if (!n.get_type().is_expression()) {
::format_json(out, n.get_type(), n.get_arrmeta(), n.get_readonly_originptr());
} else {
nd::array tmp = n.eval();
::format_json(out, tmp.get_type(), tmp.get_arrmeta(), tmp.get_readonly_originptr());
}
// Shrink the memory to fit, and set the pointers in the output
string *d = reinterpret_cast<string *>(result.get_readwrite_originptr());
d->assign(out.out_string.data(), out.out_end - out.out_begin);
// Finalize processing and mark the result as immutable
result.get_type().extended()->arrmeta_finalize_buffers(result.get_arrmeta());
result.flag_as_immutable();
return result;
}
nd::array dynd::format_json(const nd::array& n)
{
// Create a UTF-8 string
nd::array result = nd::empty(ndt::make_string());
// Initialize the output with some memory
output_data out;
out.blockref = reinterpret_cast<const string_type_metadata *>(result.get_ndo_meta())->blockref;
out.api = get_memory_block_pod_allocator_api(out.blockref);
out.api->allocate(out.blockref, 1024, 1, &out.out_begin, &out.out_capacity_end);
out.out_end = out.out_begin;
if (!n.get_type().is_expression()) {
::format_json(out, n.get_type(), n.get_ndo_meta(), n.get_readonly_originptr());
} else {
nd::array tmp = n.eval();
::format_json(out, tmp.get_type(), tmp.get_ndo_meta(), tmp.get_readonly_originptr());
}
// Shrink the memory to fit, and set the pointers in the output
string_type_data *d = reinterpret_cast<string_type_data *>(result.get_readwrite_originptr());
d->begin = out.out_begin;
d->end = out.out_capacity_end;
out.api->resize(out.blockref, out.out_end - out.out_begin, &d->begin, &d->end);
// Finalize processing and mark the result as immutable
result.get_type().extended()->metadata_finalize_buffers(result.get_ndo_meta());
result.flag_as_immutable();
return result;
}
ndt::type ndt::factor_categorical(const nd::array &values)
{
// Do the factor operation on a concrete version of the values
// TODO: Some cases where we don't want to do this?
nd::array values_eval = values.eval();
intptr_t dim_size, stride;
type el_tp;
const char *el_arrmeta;
values_eval.get_type().get_as_strided(values_eval.get()->metadata(), &dim_size, &stride, &el_tp, &el_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);
for (intptr_t i = 0; i < dim_size; ++i) {
const char *data = values_eval.cdata() + i * stride;
if (uniques.find(data) == uniques.end()) {
uniques.insert(data);
}
}
// Copy the values (now sorted and unique) into a new nd::array
nd::array categories = make_sorted_categories(uniques, el_tp, el_arrmeta);
return type(new categorical_type(categories, true), false);
}
ndt::type ndt::factor_categorical(const nd::array &values)
{
// Do the factor operation on a concrete version of the values
// TODO: Some cases where we don't want to do this?
nd::array values_eval = values.eval();
intptr_t dim_size, stride;
type el_tp;
const char *el_arrmeta;
values_eval.get_type().get_as_strided(values_eval.get_arrmeta(), &dim_size,
&stride, &el_tp, &el_arrmeta);
ckernel_builder<kernel_request_host> k;
::make_comparison_kernel(&k, 0, el_tp, el_arrmeta, el_tp, el_arrmeta,
comparison_type_sorting_less,
&eval::default_eval_context);
expr_single_t fn = k.get()->get_function<expr_single_t>();
cmp less(fn, k.get());
set<const char *, cmp> uniques(less);
for (intptr_t i = 0; i < dim_size; ++i) {
const char *data = values_eval.get_readonly_originptr() + i * stride;
if (uniques.find(data) == uniques.end()) {
uniques.insert(data);
}
}
// Copy the values (now sorted and unique) into a new nd::array
nd::array categories = make_sorted_categories(uniques, el_tp, el_arrmeta);
return type(new categorical_type(categories, true), false);
}
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_arrmeta(),
out_tmp_ref.get_readonly_originptr());
break;
default: {
// The data needs to be converted to UTF-8 before parsing
ndt::type utf8_tp = ndt::string_type::make(string_encoding_utf_8);
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_arrmeta(),
out_tmp_ref.get_readonly_originptr());
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_arrmeta(),
out_tmp_ref.get_readonly_originptr());
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;
}
}
}