diff options
Diffstat (limited to 'src/lua/ltm.c')
| -rw-r--r-- | src/lua/ltm.c | 163 |
1 files changed, 0 insertions, 163 deletions
diff --git a/src/lua/ltm.c b/src/lua/ltm.c deleted file mode 100644 index 3f69a6ca..00000000 --- a/src/lua/ltm.c +++ /dev/null @@ -1,163 +0,0 @@ -/* -** $Id: ltm.c,v 1.3 2001/11/26 23:00:26 darkgod Exp $ -** Tag methods -** See Copyright Notice in lua.h -*/ - - -#include <stdio.h> -#include <string.h> - -#include "lua.h" - -#include "ldo.h" -#include "lmem.h" -#include "lobject.h" -#include "lstate.h" -#include "ltm.h" - - -const char *const luaT_eventname[] = { /* ORDER TM */ - "gettable", "settable", "index", "getglobal", "setglobal", "add", "sub", - "mul", "div", "pow", "unm", "lt", "concat", "gc", "function", - "le", "gt", "ge", /* deprecated options!! */ - NULL -}; - - -static int findevent (const char *name) { - int i; - for (i=0; luaT_eventname[i]; i++) - if (strcmp(luaT_eventname[i], name) == 0) - return i; - return -1; /* name not found */ -} - - -static int luaI_checkevent (lua_State *L, const char *name, int t) { - int e = findevent(name); - if (e >= TM_N) - luaO_verror(L, "event `%.50s' is deprecated", name); - if (e == TM_GC && t == LUA_TTABLE) - luaO_verror(L, "event `gc' for tables is deprecated"); - if (e < 0) - luaO_verror(L, "`%.50s' is not a valid event name", name); - return e; -} - - - -/* events in LUA_TNIL are all allowed, since this is used as a -* 'placeholder' for "default" fallbacks -*/ -/* ORDER LUA_T, ORDER TM */ -static const char luaT_validevents[NUM_TAGS][TM_N] = { - {1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1}, /* LUA_TUSERDATA */ - {1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, /* LUA_TNIL */ - {1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1}, /* LUA_TNUMBER */ - {1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}, /* LUA_TSTRING */ - {0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1}, /* LUA_TTABLE */ - {1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0} /* LUA_TFUNCTION */ -}; - -int luaT_validevent (int t, int e) { /* ORDER LUA_T */ - return (t >= NUM_TAGS) ? 1 : luaT_validevents[t][e]; -} - - -static void init_entry (lua_State *L, int tag) { - int i; - for (i=0; i<TM_N; i++) - luaT_gettm(L, tag, i) = NULL; - L->TMtable[tag].collected = NULL; -} - - -void luaT_init (lua_State *L) { - int t; - luaM_growvector(L, L->TMtable, 0, NUM_TAGS, struct TM, "", MAX_INT); - L->nblocks += NUM_TAGS*sizeof(struct TM); - L->last_tag = NUM_TAGS-1; - for (t=0; t<=L->last_tag; t++) - init_entry(L, t); -} - - -LUA_API int lua_newtag (lua_State *L) { - luaM_growvector(L, L->TMtable, L->last_tag, 1, struct TM, - "tag table overflow", MAX_INT); - L->nblocks += sizeof(struct TM); - L->last_tag++; - init_entry(L, L->last_tag); - return L->last_tag; -} - - -static void checktag (lua_State *L, int tag) { - if (!(0 <= tag && tag <= L->last_tag)) - luaO_verror(L, "%d is not a valid tag", tag); -} - -void luaT_realtag (lua_State *L, int tag) { - if (!validtag(tag)) - luaO_verror(L, "tag %d was not created by `newtag'", tag); -} - - -LUA_API int lua_copytagmethods (lua_State *L, int tagto, int tagfrom) { - int e; - checktag(L, tagto); - checktag(L, tagfrom); - for (e=0; e<TM_N; e++) { - if (luaT_validevent(tagto, e)) - luaT_gettm(L, tagto, e) = luaT_gettm(L, tagfrom, e); - } - return tagto; -} - - -int luaT_tag (const TObject *o) { - int t = ttype(o); - switch (t) { - case LUA_TUSERDATA: return tsvalue(o)->u.d.tag; - case LUA_TTABLE: return hvalue(o)->htag; - default: return t; - } -} - - -LUA_API void lua_gettagmethod (lua_State *L, int t, const char *event) { - int e; - e = luaI_checkevent(L, event, t); - checktag(L, t); - if (luaT_validevent(t, e) && luaT_gettm(L, t, e)) { - clvalue(L->top) = luaT_gettm(L, t, e); - ttype(L->top) = LUA_TFUNCTION; - } - else - ttype(L->top) = LUA_TNIL; - incr_top; -} - - -LUA_API void lua_settagmethod (lua_State *L, int t, const char *event) { - int e = luaI_checkevent(L, event, t); - checktag(L, t); - if (!luaT_validevent(t, e)) - luaO_verror(L, "cannot change `%.20s' tag method for type `%.20s'%.20s", - luaT_eventname[e], luaO_typenames[t], - (t == LUA_TTABLE || t == LUA_TUSERDATA) ? - " with default tag" : ""); - switch (ttype(L->top - 1)) { - case LUA_TNIL: - luaT_gettm(L, t, e) = NULL; - break; - case LUA_TFUNCTION: - luaT_gettm(L, t, e) = clvalue(L->top - 1); - break; - default: - lua_error(L, "tag method must be a function (or nil)"); - } - L->top--; -} - |