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#ifndef __LUA_RAPIDJSON_TOLUAHANDLER_HPP__
#define __LUA_RAPIDJSON_TOLUAHANDLER_HPP__
#include <vector>
#include "qcommon/q3_lauxlib.h"
#include "lua.hpp"
#include "rapidjson.h"
#include "luax.hpp"
namespace values
{
typedef rapidjson::Document::AllocatorType Allocator;
int json_null(lua_State* L);
inline bool isnull(lua_State* L, int idx)
{
lua_pushvalue(L, idx); // [value]
json_null(L); // [value, json.null]
auto is = lua_rawequal(L, -1, -2) != 0;
lua_pop(L, 2); // []
return is;
}
inline bool hasJsonType(lua_State* L, int idx, bool& isarray)
{
auto has = false;
if (lua_getmetatable(L, idx))
{
// [metatable]
lua_getfield(L, -1, "__jsontype"); // [metatable, metatable.__jsontype]
if (lua_isstring(L, -1))
{
size_t len;
auto s = lua_tolstring(L, -1, &len);
isarray = strncmp(s, "array", 6) == 0;
has = true;
}
lua_pop(L, 2); // []
}
return has;
}
inline bool isarray(lua_State* L, int idx)
{
auto arr = false;
if (hasJsonType(L, idx, arr)) // any table with a meta field __jsontype set to 'array' are arrays
return arr;
return luax::rawlen(L, idx) > 0; // any table has length > 0 are treat as array.
}
/**
* Handle json SAX events and create Lua object.
*/
struct ToLuaHandler
{
explicit ToLuaHandler(lua_State* aL) : L(aL)
{ stack_.reserve(32); }
bool Null()
{
json_null(L);
context_.submit(L);
return true;
}
bool Bool(bool b)
{
lua_pushboolean(L, b);
context_.submit(L);
return true;
}
bool Int(int i)
{
lua_pushinteger(L, i);
context_.submit(L);
return true;
}
bool Uint(unsigned u)
{
if (sizeof(lua_Integer) > sizeof(unsigned int) || u <= static_cast<unsigned>(std::numeric_limits<lua_Integer>::max()))
lua_pushinteger(L, static_cast<lua_Integer>(u));
else
lua_pushnumber(L, static_cast<lua_Number>(u));
context_.submit(L);
return true;
}
bool Int64(int64_t i)
{
if (sizeof(lua_Integer) >= sizeof(int64_t) || (i <= std::numeric_limits<lua_Integer>::max() && i >= std::numeric_limits<lua_Integer>::min()))
lua_pushinteger(L, static_cast<lua_Integer>(i));
else
lua_pushnumber(L, static_cast<lua_Number>(i));
context_.submit(L);
return true;
}
bool Uint64(uint64_t u)
{
if (sizeof(lua_Integer) > sizeof(uint64_t) || u <= static_cast<uint64_t>(std::numeric_limits<lua_Integer>::max()))
lua_pushinteger(L, static_cast<lua_Integer>(u));
else
lua_pushnumber(L, static_cast<lua_Number>(u));
context_.submit(L);
return true;
}
bool Double(double d)
{
lua_pushnumber(L, static_cast<lua_Number>(d));
context_.submit(L);
return true;
}
bool RawNumber(const char* str, rapidjson::SizeType length, bool copy)
{
lua_getglobal(L, "tonumber");
lua_pushlstring(L, str, length);
lua_call(L, 1, 1);
context_.submit(L);
return true;
}
bool String(const char* str, rapidjson::SizeType length, bool copy)
{
lua_pushlstring(L, str, length);
context_.submit(L);
return true;
}
bool StartObject()
{
lua_createtable(L, 0, 0); // [..., object]
// mark as object.
luaL_getmetatable(L, "json.object"); //[..., object, json.object]
lua_setmetatable(L, -2); // [..., object]
stack_.push_back(context_);
context_ = Ctx::Object();
return true;
}
bool Key(const char* str, rapidjson::SizeType length, bool copy) const
{
lua_pushlstring(L, str, length);
return true;
}
bool EndObject(rapidjson::SizeType memberCount)
{
context_ = stack_.back();
stack_.pop_back();
context_.submit(L);
return true;
}
bool StartArray()
{
lua_createtable(L, 0, 0);
// mark as array.
luaL_getmetatable(L, "json.array"); //[..., array, json.array]
lua_setmetatable(L, -2); // [..., array]
stack_.push_back(context_);
context_ = Ctx::Array();
return true;
}
bool EndArray(rapidjson::SizeType elementCount)
{
assert(elementCount == context_.index_);
context_ = stack_.back();
stack_.pop_back();
context_.submit(L);
return true;
}
private:
struct Ctx
{
Ctx() : index_(0), fn_(&topFn) {}
Ctx(const Ctx& rhs) : index_(rhs.index_), fn_(rhs.fn_) {}
const Ctx& operator=(const Ctx& rhs)
{
if (this != &rhs)
{
index_ = rhs.index_;
fn_ = rhs.fn_;
}
return *this;
}
static Ctx Object()
{ return Ctx(&objectFn); }
static Ctx Array()
{ return Ctx(&arrayFn); }
void submit(lua_State* L)
{ fn_(L, this); }
int index_;
void(*fn_)(lua_State* L, Ctx* ctx);
private:
explicit Ctx(void(*f)(lua_State* L, Ctx* ctx)) : index_(0), fn_(f) {}
static void objectFn(lua_State* L, Ctx* ctx)
{ lua_rawset(L, -3); }
static void arrayFn(lua_State* L, Ctx* ctx)
{ lua_rawseti(L, -2, ++ctx->index_); }
static void topFn(lua_State* L, Ctx* ctx) {}
};
lua_State* L;
std::vector < Ctx > stack_;
Ctx context_;
};
namespace details
{
rapidjson::Value toValue(lua_State* L, int idx, int depth, Allocator& allocator);
}
inline rapidjson::Value toValue(lua_State* L, int idx, Allocator& allocator)
{
return details::toValue(L, idx, 0, allocator);
}
inline void toDocument(lua_State* L, int idx, rapidjson::Document* doc)
{
details::toValue(L, idx, 0, doc->GetAllocator()).Swap(*doc);
}
inline void push(lua_State* L, const rapidjson::Value& v)
{
ToLuaHandler handler(L);
v.Accept(handler);
}
}
#endif
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