QPDF_Dictionary.cc
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#include <qpdf/QPDF_Dictionary.hh>
#include <qpdf/JSON_writer.hh>
#include <qpdf/QPDFObject_private.hh>
#include <qpdf/QPDF_Name.hh>
#include <qpdf/QPDF_Null.hh>
#include <qpdf/QUtil.hh>
using namespace std::literals;
QPDF_Dictionary::QPDF_Dictionary(std::map<std::string, QPDFObjectHandle> const& items) :
QPDFValue(::ot_dictionary, "dictionary"),
items(items)
{
}
QPDF_Dictionary::QPDF_Dictionary(std::map<std::string, QPDFObjectHandle>&& items) :
QPDFValue(::ot_dictionary, "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;
}
JSON
QPDF_Dictionary::getJSON(int json_version)
{
JSON j = JSON::makeDictionary();
for (auto& iter: this->items) {
if (!iter.second.isNull()) {
if (json_version == 1) {
j.addDictionaryMember(
QPDF_Name::normalizeName(iter.first), iter.second.getJSON(json_version));
} else {
bool has_8bit_chars;
bool is_valid_utf8;
bool is_utf16;
QUtil::analyze_encoding(iter.first, has_8bit_chars, is_valid_utf8, is_utf16);
std::string key = !has_8bit_chars || is_valid_utf8
? iter.first
: "n:" + QPDF_Name::normalizeName(iter.first);
j.addDictionaryMember(key, iter.second.getJSON(json_version));
}
}
}
return j;
}
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 {
bool has_8bit_chars;
bool is_valid_utf8;
bool is_utf16;
QUtil::analyze_encoding(iter.first, has_8bit_chars, is_valid_utf8, is_utf16);
if (!has_8bit_chars || is_valid_utf8) {
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('}');
}
bool
QPDF_Dictionary::hasKey(std::string const& key)
{
return ((this->items.count(key) > 0) && (!this->items[key].isNull()));
}
QPDFObjectHandle
QPDF_Dictionary::getKey(std::string const& key)
{
// PDF spec says fetching a non-existent key from a dictionary returns the null object.
auto item = this->items.find(key);
if (item != this->items.end()) {
// May be a null object
return item->second;
} else {
static auto constexpr msg = " -> dictionary key $VD"sv;
return QPDF_Null::create(shared_from_this(), msg, key);
}
}
std::set<std::string>
QPDF_Dictionary::getKeys()
{
std::set<std::string> result;
for (auto& iter: this->items) {
if (!iter.second.isNull()) {
result.insert(iter.first);
}
}
return result;
}
std::map<std::string, QPDFObjectHandle> const&
QPDF_Dictionary::getAsMap() const
{
return this->items;
}
void
QPDF_Dictionary::replaceKey(std::string const& key, QPDFObjectHandle value)
{
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.
removeKey(key);
} else {
// add or replace value
this->items[key] = value;
}
}
void
QPDF_Dictionary::removeKey(std::string const& key)
{
// no-op if key does not exist
this->items.erase(key);
}