auxiliar functions from Lua API

This commit is contained in:
Roberto Ierusalimschy 1997-09-16 16:25:59 -03:00
parent c31aa863ac
commit ea169d2083
2 changed files with 584 additions and 0 deletions

564
lapi.c Normal file
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/*
** $Id: lapi.c,v 1.1 1997/08/14 13:40:46 roberto Exp roberto $
** Lua API
** See Copyright Notice in lua.h
*/
#include <stdlib.h>
#include <string.h>
#include "lapi.h"
#include "lauxlib.h"
#include "ldo.h"
#include "lfunc.h"
#include "lgc.h"
#include "lglobal.h"
#include "lmem.h"
#include "lobject.h"
#include "lstring.h"
#include "ltable.h"
#include "ltm.h"
#include "lua.h"
#include "luadebug.h"
#include "lvm.h"
char lua_ident[] = "$Lua: " LUA_VERSION " " LUA_COPYRIGHT " $\n"
"$Autores: " LUA_AUTHORS " $";
TObject *luaA_Address (lua_Object o)
{
return Address(o);
}
void luaA_packresults (void)
{
luaV_pack(luaD_Cstack.lua2C, luaD_Cstack.num, luaD_stack.top);
incr_top;
}
int luaA_passresults (void)
{
luaD_checkstack(luaD_Cstack.num);
memcpy(luaD_stack.top, luaD_Cstack.lua2C+luaD_stack.stack,
luaD_Cstack.num*sizeof(TObject));
luaD_stack.top += luaD_Cstack.num;
return luaD_Cstack.num;
}
static void checkCparams (int nParams)
{
if (luaD_stack.top-luaD_stack.stack < luaD_Cstack.base+nParams)
lua_error("API error - wrong number of arguments in C2lua stack");
}
static lua_Object put_luaObject (TObject *o)
{
luaD_openstack((luaD_stack.top-luaD_stack.stack)-luaD_Cstack.base);
luaD_stack.stack[luaD_Cstack.base++] = *o;
return luaD_Cstack.base; /* this is +1 real position (see Ref) */
}
static lua_Object put_luaObjectonTop (void)
{
luaD_openstack((luaD_stack.top-luaD_stack.stack)-luaD_Cstack.base);
luaD_stack.stack[luaD_Cstack.base++] = *(--luaD_stack.top);
return luaD_Cstack.base; /* this is +1 real position (see Ref) */
}
lua_Object lua_pop (void)
{
checkCparams(1);
return put_luaObjectonTop();
}
/*
** Get a parameter, returning the object handle or LUA_NOOBJECT on error.
** 'number' must be 1 to get the first parameter.
*/
lua_Object lua_lua2C (int number)
{
if (number <= 0 || number > luaD_Cstack.num) return LUA_NOOBJECT;
/* Ref(luaD_stack.stack+(luaD_Cstack.lua2C+number-1)) ==
luaD_stack.stack+(luaD_Cstack.lua2C+number-1)-luaD_stack.stack+1 == */
return luaD_Cstack.lua2C+number;
}
int lua_callfunction (lua_Object function)
{
if (function == LUA_NOOBJECT)
return 1;
else {
luaD_openstack((luaD_stack.top-luaD_stack.stack)-luaD_Cstack.base);
luaD_stack.stack[luaD_Cstack.base] = *Address(function);
return luaD_protectedrun(MULT_RET);
}
}
lua_Object lua_gettagmethod (int tag, char *event)
{
return put_luaObject(luaT_gettagmethod(tag, event));
}
lua_Object lua_settagmethod (int tag, char *event)
{
checkCparams(1);
luaT_settagmethod(tag, event, luaD_stack.top-1);
return put_luaObjectonTop();
}
lua_Object lua_seterrormethod (void)
{
TObject temp = luaD_errorim;
checkCparams(1);
luaD_errorim = *(--luaD_stack.top);
return put_luaObject(&temp);
}
lua_Object lua_gettable (void)
{
checkCparams(2);
luaV_gettable();
return put_luaObjectonTop();
}
lua_Object lua_rawgettable (void)
{
checkCparams(2);
if (ttype(luaD_stack.top-2) != LUA_T_ARRAY)
lua_error("indexed expression not a table in raw gettable");
else {
TObject *h = luaH_get(avalue(luaD_stack.top-2), luaD_stack.top-1);
--luaD_stack.top;
if (h != NULL)
*(luaD_stack.top-1) = *h;
else
ttype(luaD_stack.top-1) = LUA_T_NIL;
}
return put_luaObjectonTop();
}
void lua_settable (void)
{
checkCparams(3);
luaV_settable(luaD_stack.top-3, 1);
}
void lua_rawsettable (void)
{
checkCparams(3);
luaV_settable(luaD_stack.top-3, 0);
}
lua_Object lua_createtable (void)
{
TObject o;
luaC_checkGC();
avalue(&o) = luaH_new(0);
ttype(&o) = LUA_T_ARRAY;
return put_luaObject(&o);
}
lua_Object lua_getglobal (char *name)
{
luaD_checkstack(2); /* may need that to call T.M. */
luaV_getglobal(luaG_findsymbolbyname(name));
return put_luaObjectonTop();
}
lua_Object lua_rawgetglobal (char *name)
{
return put_luaObject(&luaG_global[luaG_findsymbolbyname(name)].object);
}
void lua_setglobal (char *name)
{
checkCparams(1);
luaD_checkstack(2); /* may need that to call T.M. */
luaV_setglobal(luaG_findsymbolbyname(name));
}
void lua_rawsetglobal (char *name)
{
Word n = luaG_findsymbolbyname(name);
checkCparams(1);
s_object(n) = *(--luaD_stack.top);
}
int lua_isnil (lua_Object o)
{
return (o!= LUA_NOOBJECT) && (ttype(Address(o)) == LUA_T_NIL);
}
int lua_istable (lua_Object o)
{
return (o!= LUA_NOOBJECT) && (ttype(Address(o)) == LUA_T_ARRAY);
}
int lua_isuserdata (lua_Object o)
{
return (o!= LUA_NOOBJECT) && (ttype(Address(o)) == LUA_T_USERDATA);
}
int lua_iscfunction (lua_Object o)
{
int t = lua_tag(o);
return (t == LUA_T_CMARK) || (t == LUA_T_CFUNCTION);
}
int lua_isnumber (lua_Object o)
{
return (o!= LUA_NOOBJECT) && (tonumber(Address(o)) == 0);
}
int lua_isstring (lua_Object o)
{
int t = lua_tag(o);
return (t == LUA_T_STRING) || (t == LUA_T_NUMBER);
}
int lua_isfunction (lua_Object o)
{
int t = lua_tag(o);
return (t == LUA_T_FUNCTION) || (t == LUA_T_CFUNCTION) ||
(t == LUA_T_MARK) || (t == LUA_T_CMARK);
}
real lua_getnumber (lua_Object object)
{
if (object == LUA_NOOBJECT) return 0.0;
if (tonumber (Address(object))) return 0.0;
else return (nvalue(Address(object)));
}
char *lua_getstring (lua_Object object)
{
if (object == LUA_NOOBJECT || tostring(Address(object)))
return NULL;
else return (svalue(Address(object)));
}
void *lua_getuserdata (lua_Object object)
{
if (object == LUA_NOOBJECT || ttype(Address(object)) != LUA_T_USERDATA)
return NULL;
else return tsvalue(Address(object))->u.v;
}
lua_CFunction lua_getcfunction (lua_Object object)
{
if (object == LUA_NOOBJECT || ((ttype(Address(object)) != LUA_T_CFUNCTION) &&
(ttype(Address(object)) != LUA_T_CMARK)))
return NULL;
else return (fvalue(Address(object)));
}
void lua_pushnil (void)
{
ttype(luaD_stack.top) = LUA_T_NIL;
incr_top;
}
void lua_pushnumber (real n)
{
ttype(luaD_stack.top) = LUA_T_NUMBER;
nvalue(luaD_stack.top) = n;
incr_top;
}
void lua_pushstring (char *s)
{
if (s == NULL)
ttype(luaD_stack.top) = LUA_T_NIL;
else {
tsvalue(luaD_stack.top) = luaS_new(s);
ttype(luaD_stack.top) = LUA_T_STRING;
}
incr_top;
luaC_checkGC();
}
void lua_pushcfunction (lua_CFunction fn)
{
if (fn == NULL)
ttype(luaD_stack.top) = LUA_T_NIL;
else {
ttype(luaD_stack.top) = LUA_T_CFUNCTION;
fvalue(luaD_stack.top) = fn;
}
incr_top;
}
void lua_pushusertag (void *u, int tag)
{
if (tag < 0 && tag != LUA_ANYTAG)
luaT_realtag(tag); /* error if tag is not valid */
tsvalue(luaD_stack.top) = luaS_createudata(u, tag);
ttype(luaD_stack.top) = LUA_T_USERDATA;
incr_top;
luaC_checkGC();
}
void luaA_pushobject (TObject *o)
{
*luaD_stack.top = *o;
incr_top;
}
void lua_pushobject (lua_Object o)
{
if (o == LUA_NOOBJECT)
lua_error("API error - attempt to push a NOOBJECT");
*luaD_stack.top = *Address(o);
if (ttype(luaD_stack.top) == LUA_T_MARK)
ttype(luaD_stack.top) = LUA_T_FUNCTION;
else if (ttype(luaD_stack.top) == LUA_T_CMARK)
ttype(luaD_stack.top) = LUA_T_CFUNCTION;
incr_top;
}
int lua_tag (lua_Object lo)
{
if (lo == LUA_NOOBJECT) return LUA_T_NIL;
else {
TObject *o = Address(lo);
lua_Type t = ttype(o);
if (t == LUA_T_USERDATA)
return o->value.ts->tag;
else if (t == LUA_T_ARRAY)
return o->value.a->htag;
else return t;
}
}
void lua_settag (int tag)
{
checkCparams(1);
luaT_realtag(tag);
switch (ttype(luaD_stack.top-1)) {
case LUA_T_ARRAY:
(luaD_stack.top-1)->value.a->htag = tag;
break;
case LUA_T_USERDATA:
(luaD_stack.top-1)->value.ts->tag = tag;
break;
default:
luaL_verror("cannot change the tag of a %s",
luaO_typenames[-ttype((luaD_stack.top-1))]);
}
luaD_stack.top--;
}
/*
** =======================================================
** Debug interface
** =======================================================
*/
/* Hooks */
lua_CHFunction lua_callhook = NULL;
lua_LHFunction lua_linehook = NULL;
lua_Function lua_stackedfunction (int level)
{
StkId i;
for (i = (luaD_stack.top-1)-luaD_stack.stack; i>=0; i--)
if (luaD_stack.stack[i].ttype == LUA_T_MARK || luaD_stack.stack[i].ttype == LUA_T_CMARK)
if (level-- == 0)
return Ref(luaD_stack.stack+i);
return LUA_NOOBJECT;
}
int lua_currentline (lua_Function func)
{
TObject *f = Address(func);
return (f+1 < luaD_stack.top && (f+1)->ttype == LUA_T_LINE) ? (f+1)->value.i : -1;
}
lua_Object lua_getlocal (lua_Function func, int local_number, char **name)
{
TObject *f = luaA_Address(func);
/* check whether func is a Lua function */
if (ttype(f) != LUA_T_MARK && ttype(f) != LUA_T_FUNCTION)
return LUA_NOOBJECT;
*name = luaF_getlocalname(f->value.tf, local_number, lua_currentline(func));
if (*name) {
/* if "*name", there must be a LUA_T_LINE */
/* therefore, f+2 points to function base */
return Ref((f+2)+(local_number-1));
}
else
return LUA_NOOBJECT;
}
int lua_setlocal (lua_Function func, int local_number)
{
TObject *f = Address(func);
char *name = luaF_getlocalname(f->value.tf, local_number,
lua_currentline(func));
checkCparams(1);
--luaD_stack.top;
if (name) {
/* if "name", there must be a LUA_T_LINE */
/* therefore, f+2 points to function base */
*((f+2)+(local_number-1)) = *luaD_stack.top;
return 1;
}
else
return 0;
}
void lua_funcinfo (lua_Object func, char **filename, int *linedefined)
{
TObject *f = Address(func);
if (f->ttype == LUA_T_MARK || f->ttype == LUA_T_FUNCTION)
{
TProtoFunc *fp = f->value.cl->consts[0].value.tf;
*filename = fp->fileName->str;
*linedefined = fp->lineDefined;
}
else if (f->ttype == LUA_T_CMARK || f->ttype == LUA_T_CFUNCTION)
{
*filename = "(C)";
*linedefined = -1;
}
}
static TObject *functofind;
static int checkfunc (TObject *o)
{
if (o->ttype == LUA_T_FUNCTION)
return
((functofind->ttype == LUA_T_FUNCTION ||
functofind->ttype == LUA_T_MARK) &&
(functofind->value.cl == o->value.cl));
else if (o->ttype == LUA_T_CFUNCTION)
return
((functofind->ttype == LUA_T_CFUNCTION ||
functofind->ttype == LUA_T_CMARK) &&
(functofind->value.f == o->value.f));
else return 0;
}
char *lua_getobjname (lua_Object o, char **name)
{ /* try to find a name for given function */
functofind = Address(o);
if ((*name = luaT_travtagmethods(checkfunc)) != NULL)
return "tag-method";
else if ((*name = luaG_travsymbol(checkfunc)) != NULL)
return "global";
else return "";
}
/*
** =======================================================
** BLOCK mechanism
** =======================================================
*/
#define MAX_C_BLOCKS 10
static int numCblocks = 0;
static struct C_Lua_Stack Cblocks[MAX_C_BLOCKS];
void lua_beginblock (void)
{
if (numCblocks >= MAX_C_BLOCKS)
lua_error("`lua_beginblock': too many nested blocks");
Cblocks[numCblocks] = luaD_Cstack;
numCblocks++;
}
void lua_endblock (void)
{
--numCblocks;
luaD_Cstack = Cblocks[numCblocks];
luaD_adjusttop(luaD_Cstack.base);
}
int lua_ref (int lock)
{
int ref;
checkCparams(1);
ref = luaC_ref(luaD_stack.top-1, lock);
luaD_stack.top--;
return ref;
}
lua_Object lua_getref (int ref)
{
TObject *o = luaC_getref(ref);
return (o ? put_luaObject(o) : LUA_NOOBJECT);
}
#if LUA_COMPAT2_5
/*
** API: set a function as a fallback
*/
static void do_unprotectedrun (lua_CFunction f, int nParams, int nResults)
{
StkId base = (luaD_stack.top-luaD_stack.stack)-nParams;
luaD_openstack(nParams);
luaD_stack.stack[base].ttype = LUA_T_CFUNCTION;
luaD_stack.stack[base].value.f = f;
luaD_call(base+1, nResults);
}
lua_Object lua_setfallback (char *name, lua_CFunction fallback)
{
lua_pushstring(name);
lua_pushcfunction(fallback);
do_unprotectedrun(luaT_setfallback, 2, 1);
return put_luaObjectonTop();
}
#endif

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/*
** $Id: $
** auxiliar functions from Lua API
** See Copyright Notice in lua.h
*/
#ifndef lapi_h
#define lapi_h
#include "lua.h"
#include "lobject.h"
TObject *luaA_Address (lua_Object o);
void luaA_pushobject (TObject *o);
void luaA_packresults (void);
int luaA_passresults (void);
#endif