mirror of
https://github.com/lua/lua.git
synced 2024-11-24 10:43:44 +08:00
649 lines
13 KiB
C
649 lines
13 KiB
C
/*
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** $Id: lapi.c,v 1.31 1999/01/15 13:11:22 roberto Exp roberto $
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** Lua API
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** See Copyright Notice in lua.h
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*/
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#include <stdlib.h>
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#include <string.h>
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#include "lapi.h"
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#include "lauxlib.h"
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#include "ldo.h"
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#include "lfunc.h"
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#include "lgc.h"
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#include "lmem.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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#include "lua.h"
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#include "luadebug.h"
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#include "lvm.h"
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char lua_ident[] = "$Lua: " LUA_VERSION " " LUA_COPYRIGHT " $\n"
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"$Autores: " LUA_AUTHORS " $";
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TObject *luaA_Address (lua_Object o) {
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return (o != LUA_NOOBJECT) ? Address(o) : NULL;
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}
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static lua_Type normalized_type (TObject *o)
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{
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int t = ttype(o);
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switch (t) {
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case LUA_T_PMARK:
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return LUA_T_PROTO;
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case LUA_T_CMARK:
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return LUA_T_CPROTO;
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case LUA_T_CLMARK:
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return LUA_T_CLOSURE;
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default:
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return t;
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}
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}
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static void set_normalized (TObject *d, TObject *s)
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{
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d->value = s->value;
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d->ttype = normalized_type(s);
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}
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static TObject *luaA_protovalue (TObject *o)
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{
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return (normalized_type(o) == LUA_T_CLOSURE) ? protovalue(o) : o;
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}
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void luaA_packresults (void)
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{
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luaV_pack(L->Cstack.lua2C, L->Cstack.num, L->stack.top);
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incr_top;
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}
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int luaA_passresults (void)
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{
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luaD_checkstack(L->Cstack.num);
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memcpy(L->stack.top, L->Cstack.lua2C+L->stack.stack,
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L->Cstack.num*sizeof(TObject));
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L->stack.top += L->Cstack.num;
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return L->Cstack.num;
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}
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static void checkCparams (int nParams)
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{
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if (L->stack.top-L->stack.stack < L->Cstack.base+nParams)
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lua_error("API error - wrong number of arguments in C2lua stack");
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}
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static lua_Object put_luaObject (TObject *o)
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{
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luaD_openstack((L->stack.top-L->stack.stack)-L->Cstack.base);
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L->stack.stack[L->Cstack.base++] = *o;
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return L->Cstack.base; /* this is +1 real position (see Ref) */
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}
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static lua_Object put_luaObjectonTop (void)
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{
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luaD_openstack((L->stack.top-L->stack.stack)-L->Cstack.base);
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L->stack.stack[L->Cstack.base++] = *(--L->stack.top);
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return L->Cstack.base; /* this is +1 real position (see Ref) */
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}
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lua_Object lua_pop (void)
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{
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checkCparams(1);
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return put_luaObjectonTop();
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}
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/*
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** Get a parameter, returning the object handle or LUA_NOOBJECT on error.
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** 'number' must be 1 to get the first parameter.
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*/
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lua_Object lua_lua2C (int number)
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{
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if (number <= 0 || number > L->Cstack.num) return LUA_NOOBJECT;
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/* Ref(L->stack.stack+(L->Cstack.lua2C+number-1)) ==
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L->stack.stack+(L->Cstack.lua2C+number-1)-L->stack.stack+1 == */
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return L->Cstack.lua2C+number;
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}
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int lua_callfunction (lua_Object function)
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{
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if (function == LUA_NOOBJECT)
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return 1;
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else {
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luaD_openstack((L->stack.top-L->stack.stack)-L->Cstack.base);
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set_normalized(L->stack.stack+L->Cstack.base, Address(function));
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return luaD_protectedrun(MULT_RET);
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}
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}
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lua_Object lua_gettagmethod (int tag, char *event)
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{
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return put_luaObject(luaT_gettagmethod(tag, event));
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}
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lua_Object lua_settagmethod (int tag, char *event)
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{
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checkCparams(1);
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luaT_settagmethod(tag, event, L->stack.top-1);
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return put_luaObjectonTop();
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}
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lua_Object lua_seterrormethod (void) {
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lua_Object temp;
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checkCparams(1);
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temp = lua_getglobal("_ERRORMESSAGE");
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lua_setglobal("_ERRORMESSAGE");
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return temp;
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}
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lua_Object lua_gettable (void)
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{
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checkCparams(2);
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luaV_gettable();
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return put_luaObjectonTop();
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}
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lua_Object lua_rawgettable (void)
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{
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checkCparams(2);
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if (ttype(L->stack.top-2) != LUA_T_ARRAY)
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lua_error("indexed expression not a table in rawgettable");
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else {
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*(L->stack.top-2) = *luaH_get(avalue(L->stack.top-2), L->stack.top-1);
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--L->stack.top;
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}
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return put_luaObjectonTop();
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}
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void lua_settable (void) {
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checkCparams(3);
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luaV_settable(L->stack.top-3, 0);
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}
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void lua_rawsettable (void) {
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checkCparams(3);
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luaV_rawsettable(L->stack.top-3);
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}
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lua_Object lua_createtable (void)
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{
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TObject o;
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luaC_checkGC();
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avalue(&o) = luaH_new(0);
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ttype(&o) = LUA_T_ARRAY;
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return put_luaObject(&o);
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}
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lua_Object lua_getglobal (char *name)
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{
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luaD_checkstack(2); /* may need that to call T.M. */
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luaV_getglobal(luaS_new(name));
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return put_luaObjectonTop();
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}
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lua_Object lua_rawgetglobal (char *name)
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{
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TaggedString *ts = luaS_new(name);
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return put_luaObject(&ts->u.s.globalval);
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}
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void lua_setglobal (char *name)
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{
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checkCparams(1);
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luaD_checkstack(2); /* may need that to call T.M. */
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luaV_setglobal(luaS_new(name));
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}
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void lua_rawsetglobal (char *name)
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{
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TaggedString *ts = luaS_new(name);
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checkCparams(1);
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luaS_rawsetglobal(ts, --L->stack.top);
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}
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int lua_isnil (lua_Object o)
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{
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return (o!= LUA_NOOBJECT) && (ttype(Address(o)) == LUA_T_NIL);
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}
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int lua_istable (lua_Object o)
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{
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return (o!= LUA_NOOBJECT) && (ttype(Address(o)) == LUA_T_ARRAY);
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}
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int lua_isuserdata (lua_Object o)
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{
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return (o!= LUA_NOOBJECT) && (ttype(Address(o)) == LUA_T_USERDATA);
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}
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int lua_iscfunction (lua_Object o)
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{
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return (lua_tag(o) == LUA_T_CPROTO);
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}
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int lua_isnumber (lua_Object o)
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{
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return (o!= LUA_NOOBJECT) && (tonumber(Address(o)) == 0);
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}
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int lua_isstring (lua_Object o)
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{
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int t = lua_tag(o);
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return (t == LUA_T_STRING) || (t == LUA_T_NUMBER);
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}
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int lua_isfunction (lua_Object o)
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{
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int t = lua_tag(o);
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return (t == LUA_T_PROTO) || (t == LUA_T_CPROTO);
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}
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double lua_getnumber (lua_Object object)
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{
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if (object == LUA_NOOBJECT) return 0.0;
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if (tonumber(Address(object))) return 0.0;
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else return (nvalue(Address(object)));
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}
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char *lua_getstring (lua_Object object)
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{
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luaC_checkGC(); /* "tostring" may create a new string */
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if (object == LUA_NOOBJECT || tostring(Address(object)))
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return NULL;
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else return (svalue(Address(object)));
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}
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long lua_strlen (lua_Object object)
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{
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luaC_checkGC(); /* "tostring" may create a new string */
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if (object == LUA_NOOBJECT || tostring(Address(object)))
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return 0L;
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else return (tsvalue(Address(object))->u.s.len);
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}
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void *lua_getuserdata (lua_Object object)
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{
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if (object == LUA_NOOBJECT || ttype(Address(object)) != LUA_T_USERDATA)
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return NULL;
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else return tsvalue(Address(object))->u.d.v;
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}
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lua_CFunction lua_getcfunction (lua_Object object)
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{
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if (!lua_iscfunction(object))
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return NULL;
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else return fvalue(luaA_protovalue(Address(object)));
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}
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void lua_pushnil (void)
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{
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ttype(L->stack.top) = LUA_T_NIL;
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incr_top;
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}
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void lua_pushnumber (double n)
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{
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ttype(L->stack.top) = LUA_T_NUMBER;
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nvalue(L->stack.top) = n;
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incr_top;
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}
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void lua_pushlstring (char *s, long len)
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{
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tsvalue(L->stack.top) = luaS_newlstr(s, len);
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ttype(L->stack.top) = LUA_T_STRING;
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incr_top;
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luaC_checkGC();
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}
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void lua_pushstring (char *s)
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{
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if (s == NULL)
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lua_pushnil();
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else
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lua_pushlstring(s, strlen(s));
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}
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void lua_pushcclosure (lua_CFunction fn, int n)
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{
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if (fn == NULL)
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lua_error("API error - attempt to push a NULL Cfunction");
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checkCparams(n);
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ttype(L->stack.top) = LUA_T_CPROTO;
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fvalue(L->stack.top) = fn;
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incr_top;
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luaV_closure(n);
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luaC_checkGC();
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}
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void lua_pushusertag (void *u, int tag)
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{
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if (tag < 0 && tag != LUA_ANYTAG)
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luaT_realtag(tag); /* error if tag is not valid */
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tsvalue(L->stack.top) = luaS_createudata(u, tag);
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ttype(L->stack.top) = LUA_T_USERDATA;
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incr_top;
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luaC_checkGC();
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}
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void luaA_pushobject (TObject *o)
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{
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*L->stack.top = *o;
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incr_top;
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}
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void lua_pushobject (lua_Object o)
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{
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if (o == LUA_NOOBJECT)
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lua_error("API error - attempt to push a NOOBJECT");
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else {
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set_normalized(L->stack.top, Address(o));
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incr_top;
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}
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}
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int lua_tag (lua_Object lo)
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{
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if (lo == LUA_NOOBJECT)
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return LUA_T_NIL;
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else {
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TObject *o = Address(lo);
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int t;
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switch (t = ttype(o)) {
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case LUA_T_USERDATA:
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return o->value.ts->u.d.tag;
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case LUA_T_ARRAY:
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return o->value.a->htag;
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case LUA_T_PMARK:
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return LUA_T_PROTO;
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case LUA_T_CMARK:
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return LUA_T_CPROTO;
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case LUA_T_CLOSURE: case LUA_T_CLMARK:
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return o->value.cl->consts[0].ttype;
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#ifdef DEBUG
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case LUA_T_LINE:
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LUA_INTERNALERROR("invalid type");
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#endif
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default:
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return t;
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}
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}
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}
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void lua_settag (int tag)
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{
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checkCparams(1);
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luaT_realtag(tag);
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switch (ttype(L->stack.top-1)) {
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case LUA_T_ARRAY:
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(L->stack.top-1)->value.a->htag = tag;
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break;
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case LUA_T_USERDATA:
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(L->stack.top-1)->value.ts->u.d.tag = tag;
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break;
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default:
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luaL_verror("cannot change the tag of a %.20s",
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luaO_typename(L->stack.top-1));
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}
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L->stack.top--;
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}
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/*
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** {======================================================
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** To manipulate the implementation global variables
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** =======================================================
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*/
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lua_State *lua_setstate (lua_State *st) {
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lua_State *old = lua_state;
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lua_state = st;
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return old;
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}
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lua_LHFunction lua_setlinehook (lua_LHFunction func) {
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lua_LHFunction old = lua_linehook;
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lua_linehook = func;
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return old;
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}
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lua_CHFunction lua_setcallhook (lua_CHFunction func) {
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lua_CHFunction old = lua_callhook;
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lua_callhook = func;
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return old;
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}
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int lua_setdebug (int debug) {
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int old = lua_debug;
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lua_debug = debug;
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return old;
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}
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/* }====================================================== */
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/*
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** {======================================================
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** Debug interface
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** =======================================================
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*/
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/* Hooks */
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lua_CHFunction lua_callhook = NULL;
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lua_LHFunction lua_linehook = NULL;
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lua_Function lua_stackedfunction (int level)
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{
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StkId i;
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for (i = (L->stack.top-1)-L->stack.stack; i>=0; i--) {
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int t = L->stack.stack[i].ttype;
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if (t == LUA_T_CLMARK || t == LUA_T_PMARK || t == LUA_T_CMARK)
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if (level-- == 0)
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return Ref(L->stack.stack+i);
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}
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return LUA_NOOBJECT;
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}
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int lua_nups (lua_Function func) {
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TObject *o = luaA_Address(func);
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return (!o || normalized_type(o) != LUA_T_CLOSURE) ? 0 : o->value.cl->nelems;
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}
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int lua_currentline (lua_Function func)
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{
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TObject *f = Address(func);
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return (f+1 < L->stack.top && (f+1)->ttype == LUA_T_LINE) ?
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(f+1)->value.i : -1;
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}
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lua_Object lua_getlocal (lua_Function func, int local_number, char **name)
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{
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/* check whether func is a Lua function */
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if (lua_tag(func) != LUA_T_PROTO)
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return LUA_NOOBJECT;
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else {
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TObject *f = Address(func);
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TProtoFunc *fp = luaA_protovalue(f)->value.tf;
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*name = luaF_getlocalname(fp, local_number, lua_currentline(func));
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if (*name) {
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/* if "*name", there must be a LUA_T_LINE */
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/* therefore, f+2 points to function base */
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return Ref((f+2)+(local_number-1));
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}
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else
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return LUA_NOOBJECT;
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}
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}
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int lua_setlocal (lua_Function func, int local_number)
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{
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/* check whether func is a Lua function */
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if (lua_tag(func) != LUA_T_PROTO)
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return 0;
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else {
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TObject *f = Address(func);
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TProtoFunc *fp = luaA_protovalue(f)->value.tf;
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char *name = luaF_getlocalname(fp, local_number, lua_currentline(func));
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checkCparams(1);
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--L->stack.top;
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if (name) {
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/* if "name", there must be a LUA_T_LINE */
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/* therefore, f+2 points to function base */
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*((f+2)+(local_number-1)) = *L->stack.top;
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return 1;
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}
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else
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return 0;
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}
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}
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void lua_funcinfo (lua_Object func, char **filename, int *linedefined)
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{
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if (!lua_isfunction(func))
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lua_error("API - `funcinfo' called with a non-function value");
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else {
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TObject *f = luaA_protovalue(Address(func));
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if (normalized_type(f) == LUA_T_PROTO) {
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*filename = tfvalue(f)->fileName->str;
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*linedefined = tfvalue(f)->lineDefined;
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}
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else {
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*filename = "(C)";
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*linedefined = -1;
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}
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}
|
|
}
|
|
|
|
|
|
static int checkfunc (TObject *o)
|
|
{
|
|
return luaO_equalObj(o, L->stack.top);
|
|
}
|
|
|
|
|
|
char *lua_getobjname (lua_Object o, char **name)
|
|
{ /* try to find a name for given function */
|
|
set_normalized(L->stack.top, Address(o)); /* to be accessed by "checkfunc */
|
|
if ((*name = luaT_travtagmethods(checkfunc)) != NULL)
|
|
return "tag-method";
|
|
else if ((*name = luaS_travsymbol(checkfunc)) != NULL)
|
|
return "global";
|
|
else return "";
|
|
}
|
|
|
|
/* }====================================================== */
|
|
|
|
|
|
/*
|
|
** {======================================================
|
|
** BLOCK mechanism
|
|
** =======================================================
|
|
*/
|
|
|
|
|
|
void lua_beginblock (void)
|
|
{
|
|
if (L->numCblocks >= MAX_C_BLOCKS)
|
|
lua_error("too many nested blocks");
|
|
L->Cblocks[L->numCblocks] = L->Cstack;
|
|
L->numCblocks++;
|
|
}
|
|
|
|
void lua_endblock (void)
|
|
{
|
|
--L->numCblocks;
|
|
L->Cstack = L->Cblocks[L->numCblocks];
|
|
luaD_adjusttop(L->Cstack.base);
|
|
}
|
|
|
|
|
|
|
|
int lua_ref (int lock)
|
|
{
|
|
int ref;
|
|
checkCparams(1);
|
|
ref = luaC_ref(L->stack.top-1, lock);
|
|
L->stack.top--;
|
|
return ref;
|
|
}
|
|
|
|
|
|
|
|
lua_Object lua_getref (int ref)
|
|
{
|
|
TObject *o = luaC_getref(ref);
|
|
return (o ? put_luaObject(o) : LUA_NOOBJECT);
|
|
}
|
|
|
|
/* }====================================================== */
|
|
|
|
|
|
|
|
#ifdef LUA_COMPAT2_5
|
|
/*
|
|
** API: set a function as a fallback
|
|
*/
|
|
|
|
static void do_unprotectedrun (lua_CFunction f, int nParams, int nResults)
|
|
{
|
|
StkId base = (L->stack.top-L->stack.stack)-nParams;
|
|
luaD_openstack(nParams);
|
|
L->stack.stack[base].ttype = LUA_T_CPROTO;
|
|
L->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
|
|
|