QPDF_Dictionary.cc
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#include <qpdf/QPDF_Dictionary.hh>
#include <qpdf/JSON_writer.hh>
#include <qpdf/QPDFObjectHandle_private.hh>
#include <qpdf/QPDFObject_private.hh>
#include <qpdf/QPDF_Name.hh>
#include <qpdf/QTC.hh>
#include <qpdf/QUtil.hh>
using namespace std::literals;
using namespace qpdf;
QPDF_Dictionary::QPDF_Dictionary(std::map<std::string, QPDFObjectHandle> const& items) :
QPDFValue(::ot_dictionary),
items(items)
{
}
QPDF_Dictionary::QPDF_Dictionary(std::map<std::string, QPDFObjectHandle>&& items) :
QPDFValue(::ot_dictionary),
items(items)
{
}
std::shared_ptr<QPDFObject>
QPDF_Dictionary::create(std::map<std::string, QPDFObjectHandle> const& items)
{
return do_create(new QPDF_Dictionary(items));
}
std::shared_ptr<QPDFObject>
QPDF_Dictionary::create(std::map<std::string, QPDFObjectHandle>&& items)
{
return do_create(new QPDF_Dictionary(items));
}
std::shared_ptr<QPDFObject>
QPDF_Dictionary::copy(bool shallow)
{
if (shallow) {
return create(items);
} else {
std::map<std::string, QPDFObjectHandle> new_items;
for (auto const& item: this->items) {
auto value = item.second;
new_items[item.first] = value.isIndirect() ? value : value.shallowCopy();
}
return create(new_items);
}
}
void
QPDF_Dictionary::disconnect()
{
for (auto& iter: this->items) {
QPDFObjectHandle::DisconnectAccess::disconnect(iter.second);
}
}
std::string
QPDF_Dictionary::unparse()
{
std::string result = "<< ";
for (auto& iter: this->items) {
if (!iter.second.isNull()) {
result += QPDF_Name::normalizeName(iter.first) + " " + iter.second.unparse() + " ";
}
}
result += ">>";
return result;
}
void
QPDF_Dictionary::writeJSON(int json_version, JSON::Writer& p)
{
p.writeStart('{');
for (auto& iter: this->items) {
if (!iter.second.isNull()) {
p.writeNext();
if (json_version == 1) {
p << "\"" << JSON::Writer::encode_string(QPDF_Name::normalizeName(iter.first))
<< "\": ";
} else if (auto res = QPDF_Name::analyzeJSONEncoding(iter.first); res.first) {
if (res.second) {
p << "\"" << iter.first << "\": ";
} else {
p << "\"" << JSON::Writer::encode_string(iter.first) << "\": ";
}
} else {
p << "\"n:" << JSON::Writer::encode_string(QPDF_Name::normalizeName(iter.first))
<< "\": ";
}
iter.second.writeJSON(json_version, p);
}
}
p.writeEnd('}');
}
QPDF_Dictionary*
BaseDictionary::dict() const
{
if (obj) {
if (auto d = obj->as<QPDF_Dictionary>()) {
return d;
}
}
throw std::runtime_error("Expected a dictionary but found a non-dictionary object");
return nullptr; // unreachable
}
bool
BaseDictionary::hasKey(std::string const& key) const
{
auto d = dict();
return d->items.count(key) > 0 && !d->items[key].isNull();
}
QPDFObjectHandle
BaseDictionary::getKey(std::string const& key) const
{
auto d = dict();
// PDF spec says fetching a non-existent key from a dictionary returns the null object.
auto item = d->items.find(key);
if (item != d->items.end()) {
// May be a null object
return item->second;
}
static auto constexpr msg = " -> dictionary key $VD"sv;
return QPDF_Null::create(obj, msg, key);
}
std::set<std::string>
BaseDictionary::getKeys()
{
std::set<std::string> result;
for (auto& iter: dict()->items) {
if (!iter.second.isNull()) {
result.insert(iter.first);
}
}
return result;
}
std::map<std::string, QPDFObjectHandle> const&
BaseDictionary::getAsMap() const
{
return dict()->items;
}
void
BaseDictionary::removeKey(std::string const& key)
{
// no-op if key does not exist
dict()->items.erase(key);
}
void
BaseDictionary::replaceKey(std::string const& key, QPDFObjectHandle value)
{
auto d = dict();
if (value.isNull() && !value.isIndirect()) {
// The PDF spec doesn't distinguish between keys with null values and missing keys.
// Allow indirect nulls which are equivalent to a dangling reference, which is
// permitted by the spec.
d->items.erase(key);
} else {
// add or replace value
d->items[key] = value;
}
}