source: trunk/src/lib/lua.cc @ 319

// Copyright (C) 2012-2014 ChaosForge Ltd
// http://chaosforge.org/
//
// This file is part of NV Libraries.
// For conditions of distribution and use, see copyright notice in nv.hh

#include "nv/lib/lua.hh"

#if defined( NV_LUA_DYNAMIC )

#include "nv/core/library.hh"

#if NV_LUA_VERSION == NV_LUA_52
#       undef luaL_loadfile
#       undef luaL_loadbuffer
#       undef luaL_prepbuffer
#       undef lua_tonumber
#       undef lua_tointeger
#       undef lua_tounsigned
#       undef lua_call
#       undef lua_pcall
#       undef lua_yield
#endif

#define NV_LUA_FUN( rtype, fname, fparams ) rtype (*fname) fparams = nullptr;
#if NV_LUA_VERSION == NV_LUA_52
#       define NV_LUA_FUN_51( rtype, fname, fparams )
#       define NV_LUA_FUN_52 NV_LUA_FUN
#elif NV_LUA_VERSION == NV_LUA_51
#       define NV_LUA_FUN_51 NV_LUA_FUN
#       define NV_LUA_FUN_52( rtype, fname, fparams ) 
#else
#       define NV_LUA_FUN_51( rtype, fname, fparams )
#       define NV_LUA_FUN_52( rtype, fname, fparams ) 
#endif

#include <nv/lib/detail/lua_functions.inc>

#undef NV_LUA_FUN
#undef NV_LUA_FUN_51
#undef NV_LUA_FUN_52

#if NV_LUA_VERSION == NV_LUA_5C
#       define NV_LUA_COMPAT_FUN( rt, fn, fp,u1,u2,u3,u4,u5 ) rt (*fn) fp = nullptr;
#       include <nv/lib/detail/lua_functions_compat.inc>
#       undef NV_LUA_COMPAT_FUN
int LUA_UPVALUEINDEX  = 0;
int LUA_REGISTRYINDEX = 0;
int LUA_VERSION_NUM   = 0;
size_t (*lua_rawlen)        (lua_State *L, int idx) = nullptr;
int    (*lua_absindex)      (lua_State *L, int idx) = nullptr;
void   (*lua_getglobal)     (lua_State *L, const char *var) = nullptr;
void   (*lua_setglobal)     (lua_State *L, const char *var) = nullptr;
void   (*luaL_requiref)     (lua_State *L, const char *modname, lua_CFunction openf, int glb) = nullptr;
void   (*luaL_setmetatable) (lua_State *L, const char *tname) = nullptr;
void*  (*luaL_testudata)    (lua_State *L, int ud, const char *tname) = nullptr;
void   (*lua_copy)          (lua_State *L, int fromidx, int toidx) = nullptr;
int    (*lua_compare)       (lua_State *L, int idx1, int idx2, int op) = nullptr;
void   (*lua_rawgetp)       (lua_State *L, int idx, const void *p) = nullptr;
void   (*lua_rawsetp)       (lua_State *L, int idx, const void *p) = nullptr;
void   (*lua_pushglobaltable)(lua_State* L) = nullptr;
void   (*luaL_setfuncs)     (lua_State *L, const luaL_Reg *l, int nup) = nullptr;
int    (*luaL_getsubtable)  (lua_State *L, int idx, const char *fname) = nullptr;

const lua_Number* (*lua_version) (lua_State *L) = nullptr;

// only loaded in 5.1 mode to implement lua_compare
static int    (*lua_equal)        (lua_State *L, int idx1, int idx2) = nullptr;
static int    (*lua_lessthan)     (lua_State *L, int idx1, int idx2) = nullptr;


#       define NV_LUA_COMPAT_FUN( u1,u2,u3,rt2,fn2,fp2,u4,u5 ) static rt2 (*fn2##_compat) fp2 = nullptr;
#       include <nv/lib/detail/lua_functions_compat.inc>
#       undef NV_LUA_COMPAT_FUN

#       define NV_LUA_COMPAT_FUN( rt, fn, fp, rt2, fn2, fp2,arg,ret ) \
                static rt call_##fn2##_compat fp { ret fn2##_compat arg; } 
#       include <nv/lib/detail/lua_functions_compat.inc>
#       undef NV_LUA_COMPAT_FUN

#       define LUAI_MAXSTACK_52             1000000
#       define LUAI_FIRSTPSEUDOIDX_52   (-LUAI_MAXSTACK_52 - 1000)
#       define LUA_REGISTRYINDEX_52         LUAI_FIRSTPSEUDOIDX_52
#       define LUA_GLOBALSINDEX_51      (-10002)
#       define LUA_GLOBALSINDEX_52      2
#       define LUA_REGISTRYINDEX_51     (-10000)

static int lua_absindex_51 (lua_State *L, int idx) { return (idx > 0 ? idx : idx + lua_gettop(L) + 1); };
static void lua_getglobal_51 (lua_State *L, const char *var) { lua_getfield(L, LUA_GLOBALSINDEX_51, var ); };
static void lua_setglobal_51 (lua_State *L, const char *var) { lua_setfield(L, LUA_GLOBALSINDEX_51, var ); };
static void luaL_requiref_51 (lua_State *L, const char *modname, lua_CFunction openf, int glb)
{
        lua_pushcfunction(L, openf);
        lua_pushstring(L, modname);
        lua_call(L, 1, 1);
        if (glb != 0)
        {
                lua_pushvalue( L, LUA_GLOBALSINDEX_51 );
                lua_pushvalue(L, -2); 
                lua_setfield(L, -2, modname); 
                lua_pop(L, 1); 
        }
}

static void luaL_setmetatable_51 (lua_State *L, const char *tname)
{
        luaL_getmetatable(L, tname);
        lua_setmetatable(L, -2);
}

static void *luaL_testudata_51 (lua_State *L, int ud, const char *tname)
{
        void *p = lua_touserdata(L, ud);
        if (p != NULL) 
        {  
                if (lua_getmetatable(L, ud)) 
                {
                        luaL_getmetatable(L, tname); 
                        if ( !lua_rawequal(L, -1, -2))
                                p = NULL;  
                        lua_pop(L, 2); 
                        return p;
                }
        }
        return NULL;
}

static const lua_Number *lua_version_51 (lua_State*) 
{
        static const lua_Number version = (lua_Number)LUA_VERSION_NUM;
        return &version;
}

static void lua_copy_51 (lua_State *L, int fromidx, int toidx)
{
        toidx = lua_absindex( L, toidx );
        lua_pushvalue( L, fromidx );
        lua_replace( L, toidx );
}

static int lua_compare_51(lua_State *L, int idx1, int idx2, int op)
{
        switch (op)
        {
        case LUA_OPEQ : return lua_equal( L, idx1, idx2 );
        case LUA_OPLT : return lua_lessthan( L, idx1, idx2 );
        case LUA_OPLE : return lua_lessthan( L, idx1, idx2 ) || lua_equal( L, idx1, idx2 );
        default:
                return 0;
        }
}

static void lua_rawgetp_51(lua_State *L, int idx, const void *p)
{
        idx = lua_absindex( L, idx );
        void* pp = const_cast<void *>(p); // EVIL
        lua_pushlightuserdata( L, pp );
        lua_rawget( L, idx );
}

static void lua_rawsetp_51(lua_State *L, int idx, const void *p)
{
        idx = lua_absindex( L, idx );
        void* pp = const_cast<void *>(p); // EVIL
        lua_pushlightuserdata( L, pp );
        lua_insert( L, -1 );
        lua_rawset( L, idx );
}

static int luaL_getsubtable_51(lua_State *L, int idx, const char *fname)
{
        lua_getfield(L, idx, fname);
        if ( lua_istable(L, -1) ) return 1;
        else {
                idx = lua_absindex(L, idx);
                lua_pop(L, 1);
                lua_newtable(L);
                lua_pushvalue(L, -1);
                lua_setfield(L, idx, fname); 
                return 0; 
        }
}

static void luaL_setfuncs_51(lua_State *L, const luaL_Reg *l, int nup)
{
        luaL_checkstack(L, nup, "too many upvalues");
        for (; l->name != NULL; l++) 
        {
                for (int i = 0; i < nup; i++)
                {
                        lua_pushvalue(L, -nup);
                }
                lua_pushcclosure(L, l->func, nup);
                lua_setfield(L, -(nup + 2), l->name);
        }
        lua_pop(L, nup);
}

static void lua_pushglobaltable_51(lua_State* L)
{
        lua_pushvalue( L, LUA_GLOBALSINDEX_51 );
}

static void lua_pushglobaltable_52(lua_State* L)
{
        lua_rawgeti( L, LUA_REGISTRYINDEX_52, LUA_GLOBALSINDEX_52 );
}

#endif

bool nv::load_lua_library( const char* path )
{
        static nv::library lua_library;
        if ( lua_library.is_open() ) return true;
#if NV_LUA_VERSION == NV_LUA_5C
        if ( path == nullptr )
        {
                if (!lua_library.try_open( NV_LUA_PATH_JIT ) &&
                        !lua_library.try_open( NV_LUA_PATH_52 ) )
                {
                        lua_library.open( NV_LUA_PATH_51 );
                }
        }
        else
#else
                lua_library.open( path );
#endif

#       define NV_LUA_FUN( rtype, fname, fparams ) *(void **) (&fname) = lua_library.get(#fname);
#       if NV_LUA_VERSION == NV_LUA_52
#               define NV_LUA_FUN_51( rtype, fname, fparams )
#               define NV_LUA_FUN_52 NV_LUA_FUN
#       elif NV_LUA_VERSION == NV_LUA_51
#               define NV_LUA_FUN_51 NV_LUA_FUN
#               define NV_LUA_FUN_52( rtype, fname, fparams ) 
#       else
#               define NV_LUA_FUN_51( rtype, fname, fparams )
#               define NV_LUA_FUN_52( rtype, fname, fparams ) 
#       endif

#       include <nv/lib/detail/lua_functions.inc>

#       undef NV_LUA_FUN
#       undef NV_LUA_FUN_51
#       undef NV_LUA_FUN_52

#if NV_LUA_VERSION == NV_LUA_5C
#       define NV_LUA_LOAD( fname ) *(void **) (&fname) = lua_library.get(#fname);
#       define NV_LUA_LOAD_AS( fname,fname2 ) *(void **) (&fname) = lua_library.get(#fname2);
        bool version_52 = lua_library.try_get("luaL_checkversion_") != nullptr;
        if (version_52)
        {
#       define NV_LUA_COMPAT_FUN( u1, fn, u2, u3, fn2, u5, u6, u7 ) \
        *(void **) (&(fn2##_compat)) = lua_library.get(#fn2); \
        fn = call_##fn2##_compat; 
#       include <nv/lib/detail/lua_functions_compat.inc>
#       undef NV_LUA_COMPAT_FUN
                NV_LUA_LOAD( lua_rawlen );
                NV_LUA_LOAD( lua_absindex );
                NV_LUA_LOAD( lua_getglobal );
                NV_LUA_LOAD( lua_setglobal );
                NV_LUA_LOAD( luaL_setmetatable );
                NV_LUA_LOAD( luaL_testudata );
                NV_LUA_LOAD( lua_version );
                NV_LUA_LOAD( lua_copy );
                NV_LUA_LOAD( lua_compare );
                NV_LUA_LOAD( lua_rawgetp );
                NV_LUA_LOAD( lua_rawsetp );
                NV_LUA_LOAD( luaL_setfuncs );
                NV_LUA_LOAD( luaL_getsubtable );
                NV_LUA_LOAD( luaL_requiref );

                lua_pushglobaltable = lua_pushglobaltable_52;

                LUA_UPVALUEINDEX  = LUA_REGISTRYINDEX_52;
                LUA_REGISTRYINDEX = LUA_REGISTRYINDEX_52;
                LUA_VERSION_NUM   = 502;
        }
        else
        {
#       define NV_LUA_COMPAT_FUN( u1, fn, u2, u3, u4, u5, u6, u7 ) \
                *(void **) (&fn) = lua_library.get(#fn);
#       include <nv/lib/detail/lua_functions_compat.inc>
#       undef NV_LUA_COMPAT_FUN
                NV_LUA_LOAD_AS( lua_rawlen, lua_objlen )
                lua_absindex        = lua_absindex_51;
                lua_getglobal       = lua_getglobal_51;
                lua_setglobal       = lua_setglobal_51;
                luaL_setmetatable   = luaL_setmetatable_51;
                luaL_testudata      = luaL_testudata_51;
                lua_version         = lua_version_51;
                lua_copy            = lua_copy_51;
                lua_rawgetp         = lua_rawgetp_51;
                lua_rawsetp         = lua_rawsetp_51;
                lua_pushglobaltable = lua_pushglobaltable_51;
                luaL_setfuncs       = luaL_setfuncs_51;
                luaL_getsubtable    = luaL_getsubtable_51;
                luaL_requiref       = luaL_requiref_51;

                NV_LUA_LOAD( lua_lessthan );
                NV_LUA_LOAD( lua_equal );
                lua_compare       = lua_compare_51;
                LUA_UPVALUEINDEX  = LUA_GLOBALSINDEX_51;
                LUA_REGISTRYINDEX = LUA_REGISTRYINDEX_51;
                LUA_VERSION_NUM   = 501;
        }
#       undef NV_LUA_LOAD
#endif

        return true;
}

#endif