misc/liblua/ltm.c
author nemo
Tue, 30 Mar 2010 13:33:01 +0000
changeset 3173 909b28b1b61a
parent 2812 0a24853de796
permissions -rw-r--r--
This map has always been broken. This variant makes it slightly less broken (although something changed on the ceiling might prevent hiding on pixels on the slope). What will finally fix it is either moving nets closer together or adding angle bounce to hedgehogs or some other layout that prevents hiding.
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/*
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** $Id: ltm.c,v 2.8.1.1 2007/12/27 13:02:25 roberto Exp $
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** Tag methods
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** See Copyright Notice in lua.h
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*/
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#include <string.h>
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#define ltm_c
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#define LUA_CORE
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#include "lua.h"
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#include "lobject.h"
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#include "lstate.h"
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#include "lstring.h"
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#include "ltable.h"
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#include "ltm.h"
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const char *const luaT_typenames[] = {
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  "nil", "boolean", "userdata", "number",
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  "string", "table", "function", "userdata", "thread",
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  "proto", "upval"
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};
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void luaT_init (lua_State *L) {
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  static const char *const luaT_eventname[] = {  /* ORDER TM */
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    "__index", "__newindex",
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    "__gc", "__mode", "__eq",
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    "__add", "__sub", "__mul", "__div", "__mod",
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    "__pow", "__unm", "__len", "__lt", "__le",
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    "__concat", "__call"
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  };
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  int i;
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  for (i=0; i<TM_N; i++) {
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    G(L)->tmname[i] = luaS_new(L, luaT_eventname[i]);
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    luaS_fix(G(L)->tmname[i]);  /* never collect these names */
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  }
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}
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/*
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** function to be used with macro "fasttm": optimized for absence of
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** tag methods
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*/
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const TValue *luaT_gettm (Table *events, TMS event, TString *ename) {
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  const TValue *tm = luaH_getstr(events, ename);
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  lua_assert(event <= TM_EQ);
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  if (ttisnil(tm)) {  /* no tag method? */
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    events->flags |= cast_byte(1u<<event);  /* cache this fact */
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    return NULL;
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  }
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  else return tm;
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}
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const TValue *luaT_gettmbyobj (lua_State *L, const TValue *o, TMS event) {
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  Table *mt;
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  switch (ttype(o)) {
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    case LUA_TTABLE:
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      mt = hvalue(o)->metatable;
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      break;
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    case LUA_TUSERDATA:
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      mt = uvalue(o)->metatable;
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      break;
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    default:
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      mt = G(L)->mt[ttype(o)];
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  }
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  return (mt ? luaH_getstr(mt, G(L)->tmname[event]) : luaO_nilobject);
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}
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