// Recursive function to convert JSON --> Lua table
static bool push_json_value_helper(lua_State *L, const Json::Value &value,
int nullindex)
{
switch(value.type()) {
case Json::nullValue:
default:
lua_pushvalue(L, nullindex);
break;
case Json::intValue:
lua_pushinteger(L, value.asInt());
break;
case Json::uintValue:
lua_pushinteger(L, value.asUInt());
break;
case Json::realValue:
lua_pushnumber(L, value.asDouble());
break;
case Json::stringValue:
{
const char *str = value.asCString();
lua_pushstring(L, str ? str : "");
}
break;
case Json::booleanValue:
lua_pushboolean(L, value.asInt());
break;
case Json::arrayValue:
lua_newtable(L);
for (Json::Value::const_iterator it = value.begin();
it != value.end(); ++it) {
push_json_value_helper(L, *it, nullindex);
lua_rawseti(L, -2, it.index() + 1);
}
break;
case Json::objectValue:
lua_newtable(L);
for (Json::Value::const_iterator it = value.begin();
it != value.end(); ++it) {
#ifndef JSONCPP_STRING
const char *str = it.memberName();
lua_pushstring(L, str ? str : "");
#else
std::string str = it.name();
lua_pushstring(L, str.c_str());
#endif
push_json_value_helper(L, *it, nullindex);
lua_rawset(L, -3);
}
break;
}
return true;
}
// converts JSON --> Lua table; returns false if lua stack limit exceeded
// nullindex: Lua stack index of value to use in place of JSON null
bool push_json_value(lua_State *L, const Json::Value &value, int nullindex)
{
if(nullindex < 0)
nullindex = lua_gettop(L) + 1 + nullindex;
int depth = push_json_value_getdepth(value);
// The maximum number of Lua stack slots used at each recursion level
// of push_json_value_helper is 2, so make sure there a depth * 2 slots
if (lua_checkstack(L, depth * 2))
return push_json_value_helper(L, value, nullindex);
else
return false;
}
