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/*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* Copyright (C) 2017, James R. Barlow (https://github.com/jbarlow83/)
*/
/*
* Implement repr() for QPDFObjectHandle
*
* Since qpdf largely ignores const, it is not possible to use const here,
* even though repr() is const throughout.
*
* References are used for functions that are just passing handles around.
* objecthandle_repr_inner cannot cannot use references because it calls itself.
*/
#include <sstream>
#include <iostream>
#include <iomanip>
#include <qpdf/Constants.h>
#include <qpdf/Types.h>
#include <qpdf/DLL.h>
#include <qpdf/QPDFExc.hh>
#include <qpdf/QPDFObjGen.hh>
#include <qpdf/PointerHolder.hh>
#include <qpdf/Buffer.hh>
#include <qpdf/QPDFObjectHandle.hh>
#include <qpdf/QPDF.hh>
#include <qpdf/QPDFWriter.hh>
#include "pikepdf.h"
std::string objecthandle_scalar_value(QPDFObjectHandle h, bool escaped)
{
std::stringstream ss;
switch (h.getTypeCode()) {
case QPDFObject::object_type_e::ot_null:
ss << "None";
break;
case QPDFObject::object_type_e::ot_boolean:
ss << (h.getBoolValue() ? "True" : "False");
break;
case QPDFObject::object_type_e::ot_integer:
ss << std::to_string(h.getIntValue());
break;
case QPDFObject::object_type_e::ot_real:
ss << "Decimal('" + h.getRealValue() + "')";
break;
case QPDFObject::object_type_e::ot_name:
ss << std::quoted(h.getName());
break;
case QPDFObject::object_type_e::ot_string:
ss << std::quoted(h.getUTF8Value());
break;
case QPDFObject::object_type_e::ot_operator:
ss << std::quoted(h.getOperatorValue());
break;
default:
return "<not a scalar>";
}
return ss.str();
}
std::string objecthandle_pythonic_typename(QPDFObjectHandle h, std::string prefix)
{
std::string s;
s += prefix;
switch (h.getTypeCode()) {
case QPDFObject::object_type_e::ot_null:
s += "NoneType";
break;
case QPDFObject::object_type_e::ot_boolean:
s += "Boolean";
break;
case QPDFObject::object_type_e::ot_integer:
s += "Integer";
break;
case QPDFObject::object_type_e::ot_real:
s += "Real";
break;
case QPDFObject::object_type_e::ot_name:
s += "Name";
break;
case QPDFObject::object_type_e::ot_string:
s += "String";
break;
case QPDFObject::object_type_e::ot_operator:
s += "Operator";
break;
case QPDFObject::object_type_e::ot_inlineimage:
s += "InlineImage";
break;
case QPDFObject::object_type_e::ot_array:
s += "Array";
break;
case QPDFObject::object_type_e::ot_dictionary:
if (h.hasKey("/Type")) {
s += std::string("Dictionary(type_=\"") + h.getKey("/Type").getName() + "\")";
} else {
s += "Dictionary";
}
break;
case QPDFObject::object_type_e::ot_stream:
s += "Stream";
break;
default:
s += "<Error>";
break;
}
return s;
}
std::string objecthandle_repr_typename_and_value(QPDFObjectHandle h)
{
if (h.isNull())
return "None";
return objecthandle_pythonic_typename(h) + \
"(" + objecthandle_scalar_value(h) + ")";
}
static
std::string objecthandle_repr_inner(QPDFObjectHandle h, uint depth, std::set<QPDFObjGen>* visited, bool* pure_expr)
{
StackGuard sg(" objecthandle_repr_inner");
std::ostringstream oss;
if (!h.isScalar()) {
if (visited->count(h.getObjGen()) > 0) {
*pure_expr = false;
oss << "<.get_object(" << h.getObjGen().getObj() << ", " << h.getObjGen().getGen() << ")>";
return oss.str();
}
if (!(h.getObjGen() == QPDFObjGen(0, 0)))
visited->insert(h.getObjGen());
}
switch (h.getTypeCode()) {
case QPDFObject::object_type_e::ot_null:
case QPDFObject::object_type_e::ot_boolean:
case QPDFObject::object_type_e::ot_integer:
case QPDFObject::object_type_e::ot_real:
case QPDFObject::object_type_e::ot_name:
case QPDFObject::object_type_e::ot_string:
oss << objecthandle_scalar_value(h);
break;
case QPDFObject::object_type_e::ot_operator:
oss << objecthandle_repr_typename_and_value(h);
break;
case QPDFObject::object_type_e::ot_inlineimage:
oss << objecthandle_pythonic_typename(h);
oss << "(";
oss << "data=<...>";
oss << ")";
break;
case QPDFObject::object_type_e::ot_array:
oss << "[";
{
bool first = true;
oss << " ";
for (auto item: h.getArrayAsVector()) {
if (!first) oss << ", ";
first = false;
oss << objecthandle_repr_inner(item, depth, visited, pure_expr);
}
oss << " ";
}
oss << "]";
break;
case QPDFObject::object_type_e::ot_dictionary:
oss << "{"; // This will end the line
{
bool first = true;
oss << "\n";
for (auto item: h.getDictAsMap()) {
if (!first) oss << ",\n";
first = false;
oss << std::string((depth + 1) * 2, ' '); // Indent each line
if (item.first == "/Parent" && item.second.isPagesObject()) {
// Don't visit /Parent keys since that just puts every page on the repr() of a single page
oss << std::quoted(item.first) << ": <reference to /Pages>";
} else {
oss << std::quoted(item.first) << ": " << objecthandle_repr_inner(item.second, depth + 1, visited, pure_expr);
}
}
oss << "\n";
}
oss << std::string(depth * 2, ' '); // Restore previous indent level
oss << "}";
break;
case QPDFObject::object_type_e::ot_stream:
*pure_expr = false;
oss << objecthandle_pythonic_typename(h);
oss << "(";
oss << "stream_dict=";
oss << objecthandle_repr_inner(h.getDict(), depth + 1, visited, pure_expr);
oss << ", ";
oss << "data=<...>";
oss << ")";
break;
default:
oss << "???";
break;
}
return oss.str();
}
std::string objecthandle_repr(QPDFObjectHandle h)
{
if (h.isScalar() || h.isOperator()) {
// qpdf does not consider Operator a scalar but it is as far we
// are concerned here
return objecthandle_repr_typename_and_value(h);
}
std::set<QPDFObjGen> visited;
bool pure_expr = true;
std::string inner = objecthandle_repr_inner(h, 0, &visited, &pure_expr);
std::string output;
if (h.isScalar() || h.isDictionary() || h.isArray()) {
output = objecthandle_pythonic_typename(h) + "(" + inner + ")";
} else {
output = inner;
pure_expr = false;
}
if (pure_expr) {
// The output contains no external or parent objects so this object
// can be output as a Python expression and rebuild with repr(output)
return output;
}
// Output cannot be fully described in a Python expression
return std::string("<") + output + ">";
}
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