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/*
* libnbt++ - A library for the Minecraft Named Binary Tag format.
* Copyright (C) 2013, 2015 ljfa-ag
*
* This file is part of libnbt++.
*
* libnbt++ is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* libnbt++ is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with libnbt++. If not, see <http://www.gnu.org/licenses/>.
*/
#include "text/json_formatter.h"
#include "nbt_tags.h"
#include "nbt_visitor.h"
#include <cmath>
#include <iomanip>
#include <limits>
namespace nbt
{
namespace text
{
namespace //anonymous
{
///Helper class which uses the Visitor pattern to pretty-print tags
class json_fmt_visitor : public const_nbt_visitor
{
public:
json_fmt_visitor(std::ostream& os, const json_formatter& fmt):
os(os)
{}
void visit(const tag_byte& b) override
{ os << static_cast<int>(b.get()) << "b"; } //We don't want to print a character
void visit(const tag_short& s) override
{ os << s.get() << "s"; }
void visit(const tag_int& i) override
{ os << i.get(); }
void visit(const tag_long& l) override
{ os << l.get() << "l"; }
void visit(const tag_float& f) override
{
write_float(f.get());
os << "f";
}
void visit(const tag_double& d) override
{
write_float(d.get());
os << "d";
}
void visit(const tag_byte_array& ba) override
{ os << "[" << ba.size() << " bytes]"; }
void visit(const tag_string& s) override
{ os << '"' << s.get() << '"'; } //TODO: escape special characters
void visit(const tag_list& l) override
{
//Wrap lines for lists of lists or compounds.
//Lists of other types can usually be on one line without problem.
const bool break_lines = l.size() > 0 &&
(l.el_type() == tag_type::List || l.el_type() == tag_type::Compound);
os << "[";
if(break_lines)
{
os << "\n";
++indent_lvl;
for(unsigned int i = 0; i < l.size(); ++i)
{
indent();
if(l[i])
l[i].get().accept(*this);
else
write_null();
if(i != l.size()-1)
os << ",";
os << "\n";
}
--indent_lvl;
indent();
}
else
{
for(unsigned int i = 0; i < l.size(); ++i)
{
if(l[i])
l[i].get().accept(*this);
else
write_null();
if(i != l.size()-1)
os << ", ";
}
}
os << "]";
}
void visit(const tag_compound& c) override
{
if(c.size() == 0) //No line breaks inside empty compounds please
{
os << "{}";
return;
}
os << "{\n";
++indent_lvl;
unsigned int i = 0;
for(const auto& kv: c)
{
indent();
os << kv.first << ": ";
if(kv.second)
kv.second.get().accept(*this);
else
write_null();
if(i != c.size()-1)
os << ",";
os << "\n";
++i;
}
--indent_lvl;
indent();
os << "}";
}
void visit(const tag_int_array& ia) override
{
os << "[";
for(unsigned int i = 0; i < ia.size(); ++i)
{
os << ia[i];
if(i != ia.size()-1)
os << ", ";
}
os << "]";
}
private:
const std::string indent_str = " ";
std::ostream& os;
int indent_lvl = 0;
void indent()
{
for(int i = 0; i < indent_lvl; ++i)
os << indent_str;
}
template<class T>
void write_float(T val, int precision = std::numeric_limits<T>::max_digits10)
{
if(std::isfinite(val))
os << std::setprecision(precision) << val;
else if(std::isinf(val))
{
if(std::signbit(val))
os << "-";
os << "Infinity";
}
else
os << "NaN";
}
void write_null()
{
os << "null";
}
};
}
void json_formatter::print(std::ostream& os, const tag& t) const
{
json_fmt_visitor v(os, *this);
t.accept(v);
}
}
}
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