annotate src/lua/ltm.c @ 131:7f7cc8858d2e

added rival-name letter-map
author Robert McIntyre <rlm@mit.edu>
date Sat, 17 Mar 2012 21:29:08 -0500
parents 27763b933818
children
rev   line source
rlm@1 1 /*
rlm@1 2 ** $Id: ltm.c,v 2.8.1.1 2007/12/27 13:02:25 roberto Exp $
rlm@1 3 ** Tag methods
rlm@1 4 ** See Copyright Notice in lua.h
rlm@1 5 */
rlm@1 6
rlm@1 7
rlm@1 8 #include <string.h>
rlm@1 9
rlm@1 10 #define ltm_c
rlm@1 11 #define LUA_CORE
rlm@1 12
rlm@1 13 #include "lua.h"
rlm@1 14
rlm@1 15 #include "lobject.h"
rlm@1 16 #include "lstate.h"
rlm@1 17 #include "lstring.h"
rlm@1 18 #include "ltable.h"
rlm@1 19 #include "ltm.h"
rlm@1 20
rlm@1 21
rlm@1 22
rlm@1 23 const char *const luaT_typenames[] = {
rlm@1 24 "nil", "boolean", "userdata", "number",
rlm@1 25 "string", "table", "function", "userdata", "thread",
rlm@1 26 "proto", "upval"
rlm@1 27 };
rlm@1 28
rlm@1 29
rlm@1 30 void luaT_init (lua_State *L) {
rlm@1 31 static const char *const luaT_eventname[] = { /* ORDER TM */
rlm@1 32 "__index", "__newindex",
rlm@1 33 "__gc", "__mode", "__eq",
rlm@1 34 "__add", "__sub", "__mul", "__div", "__mod",
rlm@1 35 "__pow", "__unm", "__len", "__lt", "__le",
rlm@1 36 "__concat", "__call"
rlm@1 37 };
rlm@1 38 int i;
rlm@1 39 for (i=0; i<TM_N; i++) {
rlm@1 40 G(L)->tmname[i] = luaS_new(L, luaT_eventname[i]);
rlm@1 41 luaS_fix(G(L)->tmname[i]); /* never collect these names */
rlm@1 42 }
rlm@1 43 }
rlm@1 44
rlm@1 45
rlm@1 46 /*
rlm@1 47 ** function to be used with macro "fasttm": optimized for absence of
rlm@1 48 ** tag methods
rlm@1 49 */
rlm@1 50 const TValue *luaT_gettm (Table *events, TMS event, TString *ename) {
rlm@1 51 const TValue *tm = luaH_getstr(events, ename);
rlm@1 52 lua_assert(event <= TM_EQ);
rlm@1 53 if (ttisnil(tm)) { /* no tag method? */
rlm@1 54 events->flags |= cast_byte(1u<<event); /* cache this fact */
rlm@1 55 return NULL;
rlm@1 56 }
rlm@1 57 else return tm;
rlm@1 58 }
rlm@1 59
rlm@1 60
rlm@1 61 const TValue *luaT_gettmbyobj (lua_State *L, const TValue *o, TMS event) {
rlm@1 62 Table *mt;
rlm@1 63 switch (ttype(o)) {
rlm@1 64 case LUA_TTABLE:
rlm@1 65 mt = hvalue(o)->metatable;
rlm@1 66 break;
rlm@1 67 case LUA_TUSERDATA:
rlm@1 68 mt = uvalue(o)->metatable;
rlm@1 69 break;
rlm@1 70 default:
rlm@1 71 mt = G(L)->mt[ttype(o)];
rlm@1 72 }
rlm@1 73 return (mt ? luaH_getstr(mt, G(L)->tmname[event]) : luaO_nilobject);
rlm@1 74 }
rlm@1 75