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Copy pathjson_wrap.hpp
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156 lines (123 loc) · 4.19 KB
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#ifndef CHAISCRIPT_SIMPLEJSON_WRAP_HPP
#define CHAISCRIPT_SIMPLEJSON_WRAP_HPP
#include "json.hpp"
namespace chaiscript
{
class json_wrap
{
public:
static Module& library(Module& m)
{
m.add(chaiscript::fun([](const std::string &t_str) { return from_json(t_str); }), "from_json");
m.add(chaiscript::fun(&json_wrap::to_json), "to_json");
return m;
}
private:
static Boxed_Value from_json(const json::JSON &t_json)
{
switch( t_json.JSONType() ) {
case json::JSON::Class::Null:
return Boxed_Value();
case json::JSON::Class::Object:
{
std::map<std::string, Boxed_Value> m;
for (const auto &p : t_json.object_range())
{
m.insert(std::make_pair(p.first, from_json(p.second)));
}
return Boxed_Value(m);
}
case json::JSON::Class::Array:
{
std::vector<Boxed_Value> vec;
for (const auto &p : t_json.array_range())
{
vec.emplace_back(from_json(p));
}
return Boxed_Value(vec);
}
case json::JSON::Class::String:
return Boxed_Value(t_json.to_string());
case json::JSON::Class::Floating:
return Boxed_Value(t_json.to_float());
case json::JSON::Class::Integral:
return Boxed_Value(t_json.to_int());
case json::JSON::Class::Boolean:
return Boxed_Value(t_json.to_bool());
}
throw std::runtime_error("Unknown JSON type");
}
static Boxed_Value from_json(const std::string &t_json)
{
try {
return from_json( json::JSON::Load(t_json) );
} catch (const std::out_of_range& ) {
throw std::runtime_error("Unparsed JSON input");
}
}
static std::string to_json(const Boxed_Value &t_bv)
{
return to_json_object(t_bv).dump();
}
static json::JSON to_json_object(const Boxed_Value &t_bv)
{
try {
const std::map<std::string, Boxed_Value> m = chaiscript::boxed_cast<const std::map<std::string, Boxed_Value> &>(t_bv);
json::JSON obj(json::JSON::Class::Object);
for (const auto &o : m)
{
obj[o.first] = to_json_object(o.second);
}
return obj;
} catch (const chaiscript::exception::bad_boxed_cast &) {
// not a map
}
try {
const std::vector<Boxed_Value> v = chaiscript::boxed_cast<const std::vector<Boxed_Value> &>(t_bv);
json::JSON obj(json::JSON::Class::Array);
for (size_t i = 0; i < v.size(); ++i)
{
obj[i] = to_json_object(v[i]);
}
return obj;
} catch (const chaiscript::exception::bad_boxed_cast &) {
// not a vector
}
try {
Boxed_Number bn(t_bv);
if (Boxed_Number::is_floating_point(t_bv))
{
return json::JSON(bn.get_as<double>());
} else {
return json::JSON(bn.get_as<std::int64_t>());
}
} catch (const chaiscript::detail::exception::bad_any_cast &) {
// not a number
}
try {
return json::JSON(boxed_cast<bool>(t_bv));
} catch (const chaiscript::exception::bad_boxed_cast &) {
// not a bool
}
try {
return json::JSON(boxed_cast<std::string>(t_bv));
} catch (const chaiscript::exception::bad_boxed_cast &) {
// not a string
}
try {
const chaiscript::dispatch::Dynamic_Object &o = boxed_cast<const dispatch::Dynamic_Object &>(t_bv);
json::JSON obj(json::JSON::Class::Object);
for (const auto &attr : o.get_attrs())
{
obj[attr.first] = to_json_object(attr.second);
}
return obj;
} catch (const chaiscript::exception::bad_boxed_cast &) {
// not a dynamic object
}
if (t_bv.is_null()) return json::JSON(); // a null value
throw std::runtime_error("Unknown object type to convert to JSON");
}
};
}
#endif