Files
nethack/src/nhlsel.c
2019-11-15 21:20:38 -05:00

756 lines
24 KiB
C
Executable File

/* NetHack 3.6 nhlua.c $NHDT-Date: 1524287226 2018/04/21 05:07:06 $ $NHDT-Branch: NetHack-3.6.0 $:$NHDT-Revision: 1.98 $ */
/* Copyright (c) 2018 by Pasi Kallinen */
/* NetHack may be freely redistributed. See license for details. */
#include "hack.h"
#include "sp_lev.h"
/* lua_CFunction prototypes */
static int FDECL(l_selection_new, (lua_State *));
static int FDECL(l_selection_clone, (lua_State *));
static int FDECL(l_selection_getpoint, (lua_State *));
static int FDECL(l_selection_setpoint, (lua_State *));
static int FDECL(l_selection_not, (lua_State *));
static int FDECL(l_selection_filter_percent, (lua_State *));
static int FDECL(l_selection_rndcoord, (lua_State *));
static int FDECL(l_selection_line, (lua_State *));
static int FDECL(l_selection_randline, (lua_State *));
static int FDECL(l_selection_rect, (lua_State *));
static int FDECL(l_selection_fillrect, (lua_State *));
static int FDECL(l_selection_fillrect, (lua_State *));
static int FDECL(l_selection_grow, (lua_State *));
static int FDECL(l_selection_filter_mapchar, (lua_State *));
static int FDECL(l_selection_flood, (lua_State *));
static int FDECL(l_selection_circle, (lua_State *));
static int FDECL(l_selection_ellipse, (lua_State *));
static int FDECL(l_selection_gc, (lua_State *));
static int FDECL(l_selection_not, (lua_State *));
static int FDECL(l_selection_and, (lua_State *));
static int FDECL(l_selection_or, (lua_State *));
static int FDECL(l_selection_xor, (lua_State *));
static int FDECL(l_selection_not, (lua_State *));
#if 0
/* the following do not appear to currently be
used and because they are static, the OSX
compiler is complaining about them. I've
if ifdef'd out the prototype here and the
function body below.
*/
static int FDECL(l_selection_gradient, (lua_State *));
static int FDECL(l_selection_iterate, (lua_State *));
static int FDECL(l_selection_add, (lua_State *));
static int FDECL(l_selection_sub, (lua_State *));
static int FDECL(l_selection_ipairs, (lua_State *));
/* this prototype was missing but function body was below */
static struct selectionvar *FDECL(l_selection_to, (lua_State *, int));
#endif
struct selectionvar *
l_selection_check(L, index)
lua_State *L;
int index;
{
struct selectionvar *sel;
luaL_checktype(L, index, LUA_TUSERDATA);
sel = (struct selectionvar *)luaL_checkudata(L, index, "selection");
if (!sel)
nhl_error(L, "Selection error");
return sel;
}
static int
l_selection_gc(L)
lua_State *L;
{
struct selectionvar *sel = l_selection_check(L, 1);
if (sel)
selection_free(sel);
return 0;
}
static struct selectionvar *
l_selection_to(L, index)
lua_State *L;
int index;
{
struct selectionvar *sel = (struct selectionvar *)lua_touserdata(L, index);
if (!sel)
nhl_error(L, "Selection error");
return sel;
}
static struct selectionvar *
l_selection_push(L)
lua_State *L;
{
struct selectionvar *tmp = selection_new();
struct selectionvar *sel = (struct selectionvar *)lua_newuserdata(L, sizeof(struct selectionvar));
luaL_getmetatable(L, "selection");
lua_setmetatable(L, -2);
sel->wid = tmp->wid;
sel->hei = tmp->hei;
sel->map = dupstr(tmp->map);
selection_free(tmp);
return sel;
}
/* local sel = selection.new(); */
static int
l_selection_new(L)
lua_State *L;
{
(void) l_selection_push(L);
return 1;
}
/* local sel = selection.clone(sel); */
static int
l_selection_clone(L)
lua_State *L;
{
struct selectionvar *sel = l_selection_check(L, 1);
struct selectionvar *tmp;
/* int x,y; */ /* REVIEW: unreferenced */
lua_pop(L, 1);
(void) l_selection_new(L);
tmp = l_selection_check(L, 1);
if (tmp->map)
free(tmp->map);
tmp->map = dupstr(sel->map);
tmp->wid = sel->wid;
tmp->hei = sel->hei;
return 1;
}
/* selection.set(sel, x, y); */
/* selection.set(sel, x, y, value); */
/* local sel = selection.set(); */
/* local sel = sel:set(); */
/* local sel = selection.set(sel); */
/* TODO: allow setting multiple coordinates at once: set({x,y}, {x,y}, ...); */
static int
l_selection_setpoint(L)
lua_State *L;
{
struct selectionvar *sel = (struct selectionvar *) 0;
/* REVIEW: initializer added */
schar x = -1, y = -1;
int val = 1;
int argc = lua_gettop(L);
long coord;
if (argc == 0) {
(void) l_selection_new(L);
} else if (argc == 1) {
sel = l_selection_check(L, 1);
} else if (argc == 2) {
x = (schar) luaL_checkinteger(L, 1);
y = (schar) luaL_checkinteger(L, 2);
lua_pop(L, 2);
(void) l_selection_new(L);
sel = l_selection_check(L, 1);
} else {
sel = l_selection_check(L, 1);
x = (schar) luaL_checkinteger(L, 2);
y = (schar) luaL_checkinteger(L, 3);
val = (int) luaL_optinteger(L, 4, 1);
}
if (!sel || !sel->map) {
nhl_error(L, "Selection setpoint error");
return 0;
}
if (x == -1 && y == -1)
coord = SP_COORD_PACK_RANDOM(0);
else
coord = SP_COORD_PACK(x,y);
get_location_coord(&x, &y, ANY_LOC, g.coder ? g.coder->croom : NULL, coord);
selection_setpoint(x, y, sel, val);
lua_settop(L, 1);
return 1;
}
/* local value = selection.get(sel, x, y); */
static int
l_selection_getpoint(L)
lua_State *L;
{
struct selectionvar *sel = l_selection_check(L, 1);
schar x = (schar) luaL_checkinteger(L, 2);
schar y = (schar) luaL_checkinteger(L, 3);
int val;
long coord;
if (x == -1 && y == -1)
coord = SP_COORD_PACK_RANDOM(0);
else
coord = SP_COORD_PACK(x,y);
get_location_coord(&x, &y, ANY_LOC, g.coder ? g.coder->croom : NULL, coord);
val = selection_getpoint(x, y, sel);
lua_settop(L, 0);
lua_pushnumber(L, val);
return 1;
}
/* local s = selection.negate(sel); */
/* local s = selection.negate(); */
static int
l_selection_not(L)
lua_State *L;
{
int argc = lua_gettop(L);
struct selectionvar *sel;
if (argc == 0)
(void) l_selection_new(L);
sel = l_selection_check(L, 1);
selection_not(sel);
lua_settop(L, 1);
return 1;
}
/* local sel = selection.area(4,5, 40,10) & selection.rect(7,8, 60,14); */
static int
l_selection_and(L)
lua_State *L;
{
int x,y;
struct selectionvar *sela = l_selection_check(L, 1);
struct selectionvar *selb = l_selection_check(L, 2);
for (x = 0; x < sela->wid; x++)
for (y = 0; y < sela->hei; y++) {
int val = selection_getpoint(x, y, sela) & selection_getpoint(x, y, selb);
selection_setpoint(x, y, sela, val);
}
lua_settop(L, 1);
return 1;
}
/* local sel = selection.area(4,5, 40,10) | selection.rect(7,8, 60,14); */
static int
l_selection_or(L)
lua_State *L;
{
int x,y;
struct selectionvar *sela = l_selection_check(L, 1);
struct selectionvar *selb = l_selection_check(L, 2);
for (x = 0; x < sela->wid; x++)
for (y = 0; y < sela->hei; y++) {
int val = selection_getpoint(x, y, sela) | selection_getpoint(x, y, selb);
selection_setpoint(x, y, sela, val);
}
lua_settop(L, 1);
return 1;
}
/* local sel = selection.area(4,5, 40,10) ~ selection.rect(7,8, 60,14); */
static int
l_selection_xor(L)
lua_State *L;
{
int x,y;
struct selectionvar *sela = l_selection_check(L, 1);
struct selectionvar *selb = l_selection_check(L, 2);
for (x = 0; x < sela->wid; x++)
for (y = 0; y < sela->hei; y++) {
int val = selection_getpoint(x, y, sela) ^ selection_getpoint(x, y, selb);
selection_setpoint(x, y, sela, val);
}
lua_settop(L, 1);
return 1;
}
/* local s = selection.percentage(sel, 50); */
static int
l_selection_filter_percent(L)
lua_State *L;
{
struct selectionvar *sel = l_selection_check(L, 1);
int p = (int) luaL_checkinteger(L, 2);
selection_filter_percent(sel, p);
lua_settop(L, 1);
return 1;
}
/* local x,y = selection.rndcoord(sel); */
/* local x,y = selection.rndcoord(sel, 1); */
static int
l_selection_rndcoord(L)
lua_State *L;
{
struct selectionvar *sel = l_selection_check(L, 1);
int removeit = (int) luaL_optinteger(L, 2, 0);
schar x, y;
selection_rndcoord(sel, &x, &y, removeit);
update_croom();
if (g.coder && g.coder->croom) {
x -= g.coder->croom->lx;
y -= g.coder->croom->ly;
} else {
x -= g.xstart;
y -= g.ystart;
}
lua_settop(L, 0);
lua_pushnumber(L, x);
lua_pushnumber(L, y);
return 2;
}
/* local s = selection.line(sel, x1,y1, x2,y2); */
/* local s = selection.line(x1,y1, x2,y2); */
/* s:line(x1,y1, x2,y2); */
static int
l_selection_line(L)
lua_State *L;
{
int argc = lua_gettop(L);
struct selectionvar *sel;
schar x1;
schar y1;
schar x2;
schar y2;
if (argc == 4) {
(void) l_selection_new(L);
x1 = (schar) luaL_checkinteger(L, 1);
y1 = (schar) luaL_checkinteger(L, 2);
x2 = (schar) luaL_checkinteger(L, 3);
y2 = (schar) luaL_checkinteger(L, 4);
sel = l_selection_check(L, 5);
lua_remove(L, 1);
lua_remove(L, 1);
lua_remove(L, 1);
lua_remove(L, 1);
} else {
sel = l_selection_check(L, 1);
x1 = (schar) luaL_checkinteger(L, 2);
y1 = (schar) luaL_checkinteger(L, 3);
x2 = (schar) luaL_checkinteger(L, 4);
y2 = (schar) luaL_checkinteger(L, 5);
}
get_location_coord(&x1, &y1, ANY_LOC, g.coder ? g.coder->croom : NULL, SP_COORD_PACK(x1,y1));
get_location_coord(&x2, &y2, ANY_LOC, g.coder ? g.coder->croom : NULL, SP_COORD_PACK(x2,y2));
selection_do_line(x1,y1,x2,y2, sel);
lua_settop(L, 1);
return 1;
}
/* local s = selection.rect(sel, x1,y1, x2,y2); */
static int
l_selection_rect(L)
lua_State *L;
{
int argc = lua_gettop(L);
struct selectionvar *sel;
schar x1;
schar y1;
schar x2;
schar y2;
if (argc == 4) {
(void) l_selection_new(L);
x1 = (schar) luaL_checkinteger(L, 1);
y1 = (schar) luaL_checkinteger(L, 2);
x2 = (schar) luaL_checkinteger(L, 3);
y2 = (schar) luaL_checkinteger(L, 4);
sel = l_selection_check(L, 5);
lua_remove(L, 1);
lua_remove(L, 1);
lua_remove(L, 1);
lua_remove(L, 1);
} else {
sel = l_selection_check(L, 1);
x1 = (schar) luaL_checkinteger(L, 2);
y1 = (schar) luaL_checkinteger(L, 3);
x2 = (schar) luaL_checkinteger(L, 4);
y2 = (schar) luaL_checkinteger(L, 5);
}
get_location_coord(&x1, &y1, ANY_LOC, g.coder ? g.coder->croom : NULL, SP_COORD_PACK(x1,y1));
get_location_coord(&x2, &y2, ANY_LOC, g.coder ? g.coder->croom : NULL, SP_COORD_PACK(x2,y2));
selection_do_line(x1,y1,x2,y1, sel);
selection_do_line(x1,y1,x1,y2, sel);
selection_do_line(x2,y1,x2,y2, sel);
selection_do_line(x1,y2,x2,y2, sel);
lua_settop(L, 1);
return 1;
}
/* local s = selection.fillrect(sel, x1,y1, x2,y2); */
/* local s = selection.fillrect(x1,y1, x2,y2); */
/* s:fillrect(x1,y1, x2,y2); */
/* selection.area(x1,y1, x2,y2); */
static int
l_selection_fillrect(L)
lua_State *L;
{
int argc = lua_gettop(L);
struct selectionvar *sel;
int y;
schar x1;
schar y1;
schar x2;
schar y2;
if (argc == 4) {
(void) l_selection_new(L);
x1 = (schar) luaL_checkinteger(L, 1);
y1 = (schar) luaL_checkinteger(L, 2);
x2 = (schar) luaL_checkinteger(L, 3);
y2 = (schar) luaL_checkinteger(L, 4);
sel = l_selection_check(L, 5);
lua_remove(L, 1);
lua_remove(L, 1);
lua_remove(L, 1);
lua_remove(L, 1);
} else {
sel = l_selection_check(L, 1);
x1 = (schar) luaL_checkinteger(L, 2);
y1 = (schar) luaL_checkinteger(L, 3);
x2 = (schar) luaL_checkinteger(L, 4);
y2 = (schar) luaL_checkinteger(L, 5);
}
get_location_coord(&x1, &y1, ANY_LOC, g.coder ? g.coder->croom : NULL, SP_COORD_PACK(x1,y1));
get_location_coord(&x2, &y2, ANY_LOC, g.coder ? g.coder->croom : NULL, SP_COORD_PACK(x2,y2));
if (x1 == x2) {
for (y = y1; y <= y2; y++)
selection_setpoint(x1, y, sel, 1);
} else {
for (y = y1; y <= y2; y++)
selection_do_line(x1,y,x2,y, sel);
}
lua_settop(L, 1);
return 1;
}
/* local s = selection.randline(sel, x1,y1, x2,y2, roughness); */
/* local s = selection.randline(x1,y1, x2,y2, roughness); */
/* TODO: selection.randline(x1,y1, x2,y2, roughness); */
/* TODO: selection.randline({x1,y1}, {x2,y2}, roughness); */
static int
l_selection_randline(L)
lua_State *L;
{
int argc = lua_gettop(L);
struct selectionvar *sel = (struct selectionvar *) 0;
/* REVIEW: initializer added */
schar x1, y1, x2, y2;
int roughness = 7;
if (argc == 6) {
sel = l_selection_check(L, 1);
x1 = (schar) luaL_checkinteger(L, 2);
y1 = (schar) luaL_checkinteger(L, 3);
x2 = (schar) luaL_checkinteger(L, 4);
y2 = (schar) luaL_checkinteger(L, 5);
roughness = (int) luaL_checkinteger(L, 6);
} else if (argc == 5 && lua_type(L, 1) == LUA_TNUMBER) {
x1 = (schar) luaL_checkinteger(L, 1);
y1 = (schar) luaL_checkinteger(L, 2);
x2 = (schar) luaL_checkinteger(L, 3);
y2 = (schar) luaL_checkinteger(L, 4);
roughness = (int) luaL_checkinteger(L, 5);
lua_pop(L, 5);
(void) l_selection_new(L);
sel = l_selection_check(L, 1);
}
get_location_coord(&x1, &y1, ANY_LOC, g.coder ? g.coder->croom : NULL, SP_COORD_PACK(x1,y1));
get_location_coord(&x2, &y2, ANY_LOC, g.coder ? g.coder->croom : NULL, SP_COORD_PACK(x2,y2));
selection_do_randline(x1,y1, x2,y2, roughness, 12, sel);
lua_settop(L, 1);
return 1;
}
/* local s = selection.grow(sel); */
/* local s = selection.grow(sel, "north"); */
static int
l_selection_grow(L)
lua_State *L;
{
const char *const growdirs[] = { "all", "random", "north", "west", "east", "south", NULL };
const int growdirs2i[] = { W_ANY, -1, W_NORTH, W_WEST, W_EAST, W_SOUTH, 0 };
struct selectionvar *sel = l_selection_check(L, 1);
int dir = growdirs2i[luaL_checkoption(L, 2, "all", growdirs)];
selection_do_grow(sel, dir);
lua_settop(L, 1);
return 1;
}
/* local s = selection.filter_mapchar(sel, mapchar, lit); */
static int
l_selection_filter_mapchar(L)
lua_State *L;
{
struct selectionvar *sel = l_selection_check(L, 1);
char *mapchr = dupstr(luaL_checkstring(L, 2));
xchar typ = check_mapchr(mapchr);
int lit = (int) luaL_optinteger(L, 3, -2); /* TODO: special lit values */
struct selectionvar *tmp = selection_filter_mapchar(sel, typ, lit);
if (typ == INVALID_TYPE)
nhl_error(L, "Erroneous map char");
if (sel->map)
free(sel->map);
sel->map = tmp->map;
if (tmp)
free(tmp);
if (mapchr)
free(mapchr);
lua_settop(L, 1);
return 1;
}
/* local s = selection.floodfill(sel, x, y); */
/* local s = selection.floodfill(x,y); */
static int
l_selection_flood(L)
lua_State *L;
{
int argc = lua_gettop(L);
struct selectionvar *sel = (struct selectionvar *) 0;
/* REVIEW: initializer added */
schar x, y;
if (argc == 3) {
sel = l_selection_check(L, 1);
x = (schar) luaL_checkinteger(L, 2);
y = (schar) luaL_checkinteger(L, 3);
} else if (argc == 2) {
x = (schar) luaL_checkinteger(L, 1);
y = (schar) luaL_checkinteger(L, 2);
lua_pop(L, 2);
(void) l_selection_new(L);
sel = l_selection_check(L, 1);
} else {
nhl_error(L, "wrong parameters");
}
get_location_coord(&x, &y, ANY_LOC, g.coder ? g.coder->croom : NULL, SP_COORD_PACK(x,y));
if (isok(x,y)) {
set_floodfillchk_match_under(levl[x][y].typ);
selection_floodfill(sel, x, y, FALSE);
}
lua_settop(L, 1);
return 1;
}
/* local s = selection.circle(x,y, radius); */
/* local s = selection.circle(x, y, radius, filled); */
/* local s = selection.circle(sel, x, y, radius); */
/* local s = selection.circle(sel, x, y, radius, filled); */
static int
l_selection_circle(L)
lua_State *L;
{
int argc = lua_gettop(L);
struct selectionvar *sel = (struct selectionvar *) 0;
/* REVIEW: initializer added */
schar x, y;
int r, filled = 0;
if (argc == 3) {
x = (schar) luaL_checkinteger(L, 1);
y = (schar) luaL_checkinteger(L, 2);
r = (int) luaL_checkinteger(L, 3);
lua_pop(L, 3);
(void) l_selection_new(L);
sel = l_selection_check(L, 1);
filled = 0;
} else if (argc == 4 && lua_type(L, 1) == LUA_TNUMBER) {
x = (schar) luaL_checkinteger(L, 1);
y = (schar) luaL_checkinteger(L, 2);
r = (int) luaL_checkinteger(L, 3);
filled = (int) luaL_checkinteger(L, 4); /* TODO: boolean*/
lua_pop(L, 4);
(void) l_selection_new(L);
sel = l_selection_check(L, 1);
} else if (argc == 4 || argc == 5) {
sel = l_selection_check(L, 1);
x = (schar) luaL_checkinteger(L, 2);
y = (schar) luaL_checkinteger(L, 3);
r = (int) luaL_checkinteger(L, 4);
filled = (int) luaL_optinteger(L, 5, 0); /* TODO: boolean */
} else {
nhl_error(L, "wrong parameters");
/*
* FIXME: OSX compiler is issuing a complaint
* about r being passed to selection_do_ellipse()
* below without ever having been initialized
* to something when this else clause is encountered.
* I could have added an initializer to r at the
* top, but I didn't know what it should be initialized
* to in order for selection_do_ellipse() to not
* misbehave. The parameters passed in previous versions
* were related to xaxis and yaxis.
*/
}
get_location_coord(&x, &y, ANY_LOC, g.coder ? g.coder->croom : NULL, SP_COORD_PACK(x,y));
selection_do_ellipse(sel, x,y, r,r, !filled);
lua_settop(L, 1);
return 1;
}
/* local s = selection.ellipse(x, y, radius1, radius2); */
/* local s = selection.ellipse(x, y, radius1, radius2, filled); */
/* local s = selection.ellipse(sel, x, y, radius1, radius2); */
/* local s = selection.ellipse(sel, x, y, radius1, radius2, filled); */
static int
l_selection_ellipse(L)
lua_State *L;
{
int argc = lua_gettop(L);
struct selectionvar *sel = (struct selectionvar *) 0;
/* REVIEW: initializer added */
schar x, y;
int r1, r2, filled = 0;
if (argc == 4) {
x = (schar) luaL_checkinteger(L, 1);
y = (schar) luaL_checkinteger(L, 2);
r1 = (int) luaL_checkinteger(L, 3);
r2 = (int) luaL_checkinteger(L, 4);
lua_pop(L, 4);
(void) l_selection_new(L);
sel = l_selection_check(L, 1);
filled = 0;
} else if (argc == 5 && lua_type(L, 1) == LUA_TNUMBER) {
x = (schar) luaL_checkinteger(L, 1);
y = (schar) luaL_checkinteger(L, 2);
r1 = (int) luaL_checkinteger(L, 3);
r2 = (int) luaL_checkinteger(L, 4);
filled = (int) luaL_optinteger(L, 5, 0); /* TODO: boolean */
lua_pop(L, 5);
(void) l_selection_new(L);
sel = l_selection_check(L, 1);
} else if (argc == 5 || argc == 6) {
sel = l_selection_check(L, 1);
x = (schar) luaL_checkinteger(L, 2);
y = (schar) luaL_checkinteger(L, 3);
r1 = (int) luaL_checkinteger(L, 4);
r2 = (int) luaL_checkinteger(L, 5);
filled = (int) luaL_optinteger(L, 6, 0); /* TODO: boolean */
} else {
nhl_error(L, "wrong parameters");
/*
* FIXME: OSX compiler is issuing a complaint
* about r1 and r2 being passed to selection_do_ellipse()
* below without ever having been initialized
* to something when this else clause is encountered.
* I could have added an initializer to r1,r2 at the
* top, but I didn't know what they should be initialized
* to in order for selection_do_ellipse() to not
* misbehave. The parameters passed in previous versions
* were related to xaxis and yaxis.
*/
}
get_location_coord(&x, &y, ANY_LOC, g.coder ? g.coder->croom : NULL, SP_COORD_PACK(x,y));
selection_do_ellipse(sel, x,y, r1,r2, !filled);
lua_settop(L, 1);
return 1;
}
static const struct luaL_Reg l_selection_methods[] = {
{ "new", l_selection_new },
{ "clone", l_selection_clone },
{ "get", l_selection_getpoint },
{ "set", l_selection_setpoint },
{ "negate", l_selection_not },
{ "percentage", l_selection_filter_percent },
{ "rndcoord", l_selection_rndcoord },
{ "line", l_selection_line },
{ "randline", l_selection_randline },
{ "rect", l_selection_rect },
{ "fillrect", l_selection_fillrect },
{ "area", l_selection_fillrect },
{ "grow", l_selection_grow },
{ "filter_mapchar", l_selection_filter_mapchar },
{ "floodfill", l_selection_flood },
{ "circle", l_selection_circle },
{ "ellipse", l_selection_ellipse },
/* TODO:
{ "gradient", l_selection_gradient },
{ "iterate", l_selection_iterate },
*/
{ NULL, NULL }
};
static const luaL_Reg l_selection_meta[] = {
{ "__gc", l_selection_gc },
{ "__unm", l_selection_not },
{ "__band", l_selection_and },
{ "__bor", l_selection_or },
{ "__bxor", l_selection_xor },
{ "__bnot", l_selection_not },
/* TODO: http://lua-users.org/wiki/MetatableEvents
{ "__add", l_selection_add },
{ "__sub", l_selection_sub },
{ "__ipairs", l_selection_ipairs },
*/
{ NULL, NULL }
};
int
l_selection_register(L)
lua_State *L;
{
int lib_id, meta_id;
/* newclass = {} */
lua_createtable(L, 0, 0);
lib_id = lua_gettop(L);
/* metatable = {} */
luaL_newmetatable(L, "selection");
meta_id = lua_gettop(L);
luaL_setfuncs(L, l_selection_meta, 0);
/* metatable.__index = _methods */
luaL_newlib(L, l_selection_methods);
lua_setfield(L, meta_id, "__index");
/* metatable.__metatable = _meta */
luaL_newlib(L, l_selection_meta);
lua_setfield(L, meta_id, "__metatable");
/* class.__metatable = metatable */
lua_setmetatable(L, lib_id);
/* _G["selection"] = newclass */
lua_setglobal(L, "selection");
return 0;
}