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Some generic functions over Lua objects

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Roberto Ierusalimschy 1997-09-16 16:25:59 -03:00
parent a404f6e0e6
commit c1801e623f
1 changed files with 68 additions and 0 deletions
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/*
** $Id: $
** Some generic functions over Lua objects
** See Copyright Notice in lua.h
*/
#include <stdlib.h>
#include <string.h>
#include "lobject.h"
#include "lua.h"
char *luaO_typenames[] = { /* ORDER LUA_T */
"userdata", "line", "cmark", "mark", "function", "function",
"prototype", "table", "string", "number", "nil",
NULL
};
long luaO_nentities = 0;
/* hash dimensions values */
static long dimensions[] =
{5L, 11L, 23L, 47L, 97L, 197L, 397L, 797L, 1597L, 3203L, 6421L,
12853L, 25717L, 51437L, 102811L, 205619L, 411233L, 822433L,
1644817L, 3289613L, 6579211L, 13158023L, MAX_INT};
int luaO_redimension (int oldsize)
{
int i;
for (i=0; dimensions[i]<MAX_INT; i++) {
if (dimensions[i] > oldsize)
return dimensions[i];
}
lua_error("table overflow");
return 0; /* to avoid warnings */
}
int luaO_equalObj (TObject *t1, TObject *t2)
{
if (ttype(t1) != ttype(t2)) return 0;
switch (ttype(t1)) {
case LUA_T_NIL: return 1;
case LUA_T_NUMBER: return nvalue(t1) == nvalue(t2);
case LUA_T_STRING: case LUA_T_USERDATA: return svalue(t1) == svalue(t2);
case LUA_T_ARRAY: return avalue(t1) == avalue(t2);
case LUA_T_FUNCTION: return t1->value.cl == t2->value.cl;
case LUA_T_CFUNCTION: return fvalue(t1) == fvalue(t2);
default:
lua_error("internal error in `lua_equalObj'");
return 0; /* UNREACHEABLE */
}
}
int luaO_findstring (char *name, char *list[])
{
int i;
for (i=0; list[i]; i++)
if (strcmp(list[i], name) == 0)
return i;
return -1; /* name not found */
}