mirror of
https://github.com/lua/lua
synced 2024-12-26 04:16:52 +03:00
781 lines
16 KiB
C
781 lines
16 KiB
C
/*
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** $Id: lapi.c,v 1.146 2001/06/15 20:36:57 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 <string.h>
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#define LUA_PRIVATE
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#include "lua.h"
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#include "lapi.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 "lvm.h"
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const l_char lua_ident[] = l_s("$Lua: ") l_s(LUA_VERSION) l_s(" ")
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l_s(LUA_COPYRIGHT) l_s(" $\n") l_s("$Authors: ") l_s(LUA_AUTHORS) l_s(" $");
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#ifndef api_check
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#define api_check(L, o) /* nothing */
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#endif
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#define api_checknelems(L, n) api_check(L, (n) <= (L->top - L->ci->base))
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#define api_incr_top(L) incr_top
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TObject *luaA_index (lua_State *L, int index) {
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if (index > 0) {
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api_check(L, index <= L->top - L->ci->base);
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return L->ci->base+index-1;
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}
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else {
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api_check(L, index != 0 && -index <= L->top - L->ci->base);
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return L->top+index;
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}
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}
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static TObject *luaA_indexAcceptable (lua_State *L, int index) {
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if (index > 0) {
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TObject *o = L->ci->base+(index-1);
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api_check(L, index <= L->stack_last - L->ci->base);
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if (o >= L->top) return NULL;
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else return o;
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}
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else {
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api_check(L, index != 0 && -index <= L->top - L->ci->base);
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return L->top+index;
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}
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}
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void luaA_pushobject (lua_State *L, const TObject *o) {
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setobj(L->top, o);
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incr_top;
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}
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LUA_API int lua_stackspace (lua_State *L) {
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return (L->stack_last - L->top);
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}
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/*
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** basic stack manipulation
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*/
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LUA_API int lua_gettop (lua_State *L) {
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return (L->top - L->ci->base);
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}
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LUA_API void lua_settop (lua_State *L, int index) {
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lua_lock(L);
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if (index >= 0) {
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api_check(L, index <= L->stack_last - L->ci->base);
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luaD_adjusttop(L, L->ci->base+index);
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}
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else {
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api_check(L, -(index+1) <= (L->top - L->ci->base));
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L->top += index+1; /* `subtract' index (index is negative) */
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}
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lua_unlock(L);
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}
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LUA_API void lua_remove (lua_State *L, int index) {
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StkId p;
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lua_lock(L);
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p = luaA_index(L, index);
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while (++p < L->top) setobj(p-1, p);
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L->top--;
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lua_unlock(L);
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}
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LUA_API void lua_insert (lua_State *L, int index) {
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StkId p;
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StkId q;
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lua_lock(L);
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p = luaA_index(L, index);
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for (q = L->top; q>p; q--) setobj(q, q-1);
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setobj(p, L->top);
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lua_unlock(L);
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}
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LUA_API void lua_pushvalue (lua_State *L, int index) {
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lua_lock(L);
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setobj(L->top, luaA_index(L, index));
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api_incr_top(L);
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lua_unlock(L);
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}
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/*
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** access functions (stack -> C)
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*/
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LUA_API int lua_type (lua_State *L, int index) {
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StkId o = luaA_indexAcceptable(L, index);
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return (o == NULL) ? LUA_TNONE : ttype(o);
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}
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LUA_API const l_char *lua_tag2name (lua_State *L, int tag) {
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const l_char *s;
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lua_lock(L);
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s = (tag == LUA_TNONE) ? l_s("no value") : basictypename(G(L), tag);
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lua_unlock(L);
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return s;
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}
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LUA_API const l_char *lua_xtypename (lua_State *L, int index) {
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StkId o;
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const l_char *type;
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lua_lock(L);
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o = luaA_indexAcceptable(L, index);
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type = (o == NULL) ? l_s("no value") : luaT_typename(G(L), o);
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lua_unlock(L);
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return type;
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}
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LUA_API int lua_iscfunction (lua_State *L, int index) {
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StkId o = luaA_indexAcceptable(L, index);
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return (o == NULL) ? 0 : iscfunction(o);
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}
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LUA_API int lua_isnumber (lua_State *L, int index) {
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TObject n;
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TObject *o = luaA_indexAcceptable(L, index);
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return (o != NULL && (ttype(o) == LUA_TNUMBER || luaV_tonumber(o, &n)));
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}
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LUA_API int lua_isstring (lua_State *L, int index) {
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int t = lua_type(L, index);
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return (t == LUA_TSTRING || t == LUA_TNUMBER);
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}
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LUA_API int lua_tag (lua_State *L, int index) {
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StkId o;
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int i;
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lua_lock(L); /* other thread could be changing the tag */
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o = luaA_indexAcceptable(L, index);
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i = (o == NULL) ? LUA_NOTAG : luaT_tag(o);
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lua_unlock(L);
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return i;
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}
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LUA_API int lua_equal (lua_State *L, int index1, int index2) {
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StkId o1 = luaA_indexAcceptable(L, index1);
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StkId o2 = luaA_indexAcceptable(L, index2);
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return (o1 == NULL || o2 == NULL) ? 0 /* index out of range */
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: luaO_equalObj(o1, o2);
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}
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LUA_API int lua_lessthan (lua_State *L, int index1, int index2) {
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StkId o1, o2;
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int i;
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lua_lock(L); /* may call tag method */
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o1 = luaA_indexAcceptable(L, index1);
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o2 = luaA_indexAcceptable(L, index2);
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i = (o1 == NULL || o2 == NULL) ? 0 /* index out-of-range */
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: luaV_lessthan(L, o1, o2);
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lua_unlock(L);
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return i;
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}
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LUA_API lua_Number lua_tonumber (lua_State *L, int index) {
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TObject n;
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const TObject *o = luaA_indexAcceptable(L, index);
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if (o != NULL &&
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(ttype(o) == LUA_TNUMBER || (o = luaV_tonumber(o, &n)) != NULL))
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return nvalue(o);
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else
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return 0;
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}
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LUA_API const l_char *lua_tostring (lua_State *L, int index) {
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StkId o = luaA_indexAcceptable(L, index);
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if (o == NULL)
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return NULL;
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else if (ttype(o) == LUA_TSTRING)
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return svalue(o);
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else {
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const l_char *s;
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lua_lock(L); /* `luaV_tostring' may create a new string */
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s = (luaV_tostring(L, o) == 0) ? svalue(o) : NULL;
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lua_unlock(L);
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return s;
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}
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}
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LUA_API size_t lua_strlen (lua_State *L, int index) {
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StkId o = luaA_indexAcceptable(L, index);
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if (o == NULL)
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return 0;
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else if (ttype(o) == LUA_TSTRING)
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return tsvalue(o)->tsv.len;
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else {
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size_t l;
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lua_lock(L); /* `luaV_tostring' may create a new string */
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l = (luaV_tostring(L, o) == 0) ? tsvalue(o)->tsv.len : 0;
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lua_unlock(L);
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return l;
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}
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}
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LUA_API lua_CFunction lua_tocfunction (lua_State *L, int index) {
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StkId o = luaA_indexAcceptable(L, index);
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return (o == NULL || !iscfunction(o)) ? NULL : clvalue(o)->f.c;
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}
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LUA_API void *lua_touserdata (lua_State *L, int index) {
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StkId o = luaA_indexAcceptable(L, index);
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return (o == NULL || ttype(o) != LUA_TUSERDATA) ? NULL : uvalue(o)->uv.value;
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}
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LUA_API const void *lua_topointer (lua_State *L, int index) {
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StkId o = luaA_indexAcceptable(L, index);
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if (o == NULL) return NULL;
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else {
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switch (ttype(o)) {
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case LUA_TTABLE: return hvalue(o);
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case LUA_TFUNCTION: return clvalue(o);
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default: return NULL;
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}
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}
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}
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/*
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** push functions (C -> stack)
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*/
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LUA_API void lua_pushnil (lua_State *L) {
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lua_lock(L);
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setnilvalue(L->top);
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api_incr_top(L);
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lua_unlock(L);
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}
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LUA_API void lua_pushnumber (lua_State *L, lua_Number n) {
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lua_lock(L);
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setnvalue(L->top, n);
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api_incr_top(L);
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lua_unlock(L);
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}
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LUA_API void lua_pushlstring (lua_State *L, const l_char *s, size_t len) {
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lua_lock(L);
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setsvalue(L->top, luaS_newlstr(L, s, len));
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api_incr_top(L);
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lua_unlock(L);
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}
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LUA_API void lua_pushstring (lua_State *L, const l_char *s) {
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if (s == NULL)
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lua_pushnil(L);
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else
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lua_pushlstring(L, s, strlen(s));
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}
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LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) {
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lua_lock(L);
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api_checknelems(L, n);
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luaV_Cclosure(L, fn, n);
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lua_unlock(L);
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}
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/*
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** get functions (Lua -> stack)
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*/
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LUA_API void lua_getglobal (lua_State *L, const l_char *name) {
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lua_lock(L);
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luaV_getglobal(L, luaS_new(L, name), L->top);
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api_incr_top(L);
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lua_unlock(L);
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}
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LUA_API void lua_gettable (lua_State *L, int index) {
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StkId t;
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lua_lock(L);
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t = luaA_index(L, index);
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luaV_gettable(L, t, L->top-1, L->top-1);
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lua_unlock(L);
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}
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LUA_API void lua_rawget (lua_State *L, int index) {
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StkId t;
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lua_lock(L);
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t = luaA_index(L, index);
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api_check(L, ttype(t) == LUA_TTABLE);
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setobj(L->top - 1, luaH_get(hvalue(t), L->top - 1));
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lua_unlock(L);
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}
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LUA_API void lua_rawgeti (lua_State *L, int index, int n) {
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StkId o;
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lua_lock(L);
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o = luaA_index(L, index);
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api_check(L, ttype(o) == LUA_TTABLE);
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setobj(L->top, luaH_getnum(hvalue(o), n));
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api_incr_top(L);
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lua_unlock(L);
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}
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LUA_API void lua_getglobals (lua_State *L) {
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lua_lock(L);
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sethvalue(L->top, L->gt);
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api_incr_top(L);
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lua_unlock(L);
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}
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LUA_API int lua_getref (lua_State *L, int ref) {
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int status;
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lua_lock(L);
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if (ref == LUA_REFNIL) {
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setnilvalue(L->top);
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status = 1;
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}
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else {
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setobj(L->top, luaH_getnum(G(L)->weakregistry, ref));
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status = (ttype(L->top) != LUA_TNIL);
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}
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if (status)
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api_incr_top(L);
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lua_unlock(L);
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return status;
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}
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LUA_API void lua_newtable (lua_State *L) {
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lua_lock(L);
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sethvalue(L->top, luaH_new(L, 0));
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api_incr_top(L);
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lua_unlock(L);
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}
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LUA_API void lua_getregistry (lua_State *L) {
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lua_lock(L);
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sethvalue(L->top, G(L)->registry);
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api_incr_top(L);
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lua_unlock(L);
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}
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LUA_API void lua_getweakregistry (lua_State *L) {
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lua_lock(L);
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sethvalue(L->top, G(L)->weakregistry);
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api_incr_top(L);
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lua_unlock(L);
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}
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/*
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** set functions (stack -> Lua)
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*/
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LUA_API void lua_setglobal (lua_State *L, const l_char *name) {
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lua_lock(L);
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api_checknelems(L, 1);
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luaV_setglobal(L, luaS_new(L, name), L->top - 1);
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L->top--; /* remove element from the top */
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lua_unlock(L);
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}
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LUA_API void lua_settable (lua_State *L, int index) {
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StkId t;
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lua_lock(L);
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api_checknelems(L, 2);
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t = luaA_index(L, index);
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luaV_settable(L, t, L->top - 2, L->top - 1);
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L->top -= 2; /* pop index and value */
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lua_unlock(L);
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}
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LUA_API void lua_rawset (lua_State *L, int index) {
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StkId t;
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lua_lock(L);
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api_checknelems(L, 2);
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t = luaA_index(L, index);
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api_check(L, ttype(t) == LUA_TTABLE);
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setobj(luaH_set(L, hvalue(t), L->top-2), (L->top-1));
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L->top -= 2;
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lua_unlock(L);
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}
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LUA_API void lua_rawseti (lua_State *L, int index, int n) {
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StkId o;
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lua_lock(L);
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api_checknelems(L, 1);
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o = luaA_index(L, index);
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api_check(L, ttype(o) == LUA_TTABLE);
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setobj(luaH_setnum(L, hvalue(o), n), (L->top-1));
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L->top--;
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lua_unlock(L);
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}
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LUA_API void lua_setglobals (lua_State *L) {
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StkId newtable;
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lua_lock(L);
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api_checknelems(L, 1);
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newtable = --L->top;
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api_check(L, ttype(newtable) == LUA_TTABLE);
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L->gt = hvalue(newtable);
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lua_unlock(L);
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}
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LUA_API int lua_ref (lua_State *L, int lock) {
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int ref;
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if (lua_isnil(L, -1)) {
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lua_pop(L, 1);
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ref = LUA_REFNIL;
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}
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else {
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lua_getweakregistry(L);
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ref = lua_getn(L, -1) + 1;
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lua_pushvalue(L, -2);
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lua_rawseti(L, -2, ref);
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if (lock) {
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lua_getregistry(L);
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lua_pushvalue(L, -3);
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lua_rawseti(L, -2, ref);
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lua_pop(L, 1); /* remove registry */
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}
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lua_pushliteral(L, "n");
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lua_pushnumber(L, ref);
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lua_settable(L, -3);
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lua_pop(L, 2);
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}
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return ref;
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}
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/*
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** `do' functions (run Lua code)
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*/
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LUA_API void lua_rawcall (lua_State *L, int nargs, int nresults) {
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StkId func;
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lua_lock(L);
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api_checknelems(L, nargs+1);
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func = L->top - (nargs+1);
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luaD_call(L, func);
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if (nresults != LUA_MULTRET)
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luaD_adjusttop(L, func + nresults);
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lua_unlock(L);
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}
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LUA_API int lua_dofile (lua_State *L, const l_char *filename) {
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int status;
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status = lua_loadfile(L, filename);
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if (status == 0) /* parse OK? */
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status = lua_call(L, 0, LUA_MULTRET); /* call main */
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return status;
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}
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LUA_API int lua_dobuffer (lua_State *L, const l_char *buff, size_t size,
|
|
const l_char *name) {
|
|
int status;
|
|
status = lua_loadbuffer(L, buff, size, name);
|
|
if (status == 0) /* parse OK? */
|
|
status = lua_call(L, 0, LUA_MULTRET); /* call main */
|
|
return status;
|
|
}
|
|
|
|
|
|
LUA_API int lua_dostring (lua_State *L, const l_char *str) {
|
|
return lua_dobuffer(L, str, strlen(str), str);
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
** Garbage-collection functions
|
|
*/
|
|
|
|
/* GC values are expressed in Kbytes: #bytes/2^10 */
|
|
#define GCscale(x) ((int)((x)>>10))
|
|
#define GCunscale(x) ((lu_mem)(x)<<10)
|
|
|
|
LUA_API int lua_getgcthreshold (lua_State *L) {
|
|
int threshold;
|
|
lua_lock(L);
|
|
threshold = GCscale(G(L)->GCthreshold);
|
|
lua_unlock(L);
|
|
return threshold;
|
|
}
|
|
|
|
LUA_API int lua_getgccount (lua_State *L) {
|
|
int count;
|
|
lua_lock(L);
|
|
count = GCscale(G(L)->nblocks);
|
|
lua_unlock(L);
|
|
return count;
|
|
}
|
|
|
|
LUA_API void lua_setgcthreshold (lua_State *L, int newthreshold) {
|
|
lua_lock(L);
|
|
if (newthreshold > GCscale(ULONG_MAX))
|
|
G(L)->GCthreshold = ULONG_MAX;
|
|
else
|
|
G(L)->GCthreshold = GCunscale(newthreshold);
|
|
luaC_checkGC(L);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
/*
|
|
** miscellaneous functions
|
|
*/
|
|
|
|
LUA_API int lua_newxtype (lua_State *L, const l_char *name, int basictype) {
|
|
int tag;
|
|
lua_lock(L);
|
|
if (basictype != LUA_TNONE &&
|
|
basictype != LUA_TTABLE &&
|
|
basictype != LUA_TUSERDATA)
|
|
luaO_verror(L, l_s("invalid basic type (%d) for new type"), basictype);
|
|
tag = luaT_newtag(L, name, basictype);
|
|
if (tag == LUA_TNONE)
|
|
luaO_verror(L, l_s("type name '%.30s' already exists"), name);
|
|
lua_unlock(L);
|
|
return tag;
|
|
}
|
|
|
|
|
|
LUA_API int lua_name2tag (lua_State *L, const l_char *name) {
|
|
int tag;
|
|
const TObject *v;
|
|
lua_lock(L);
|
|
v = luaH_getstr(G(L)->type2tag, luaS_new(L, name));
|
|
if (ttype(v) == LUA_TNIL)
|
|
tag = LUA_TNONE;
|
|
else {
|
|
lua_assert(ttype(v) == LUA_TNUMBER);
|
|
tag = (int)nvalue(v);
|
|
}
|
|
lua_unlock(L);
|
|
return tag;
|
|
}
|
|
|
|
|
|
LUA_API void lua_settag (lua_State *L, int tag) {
|
|
int basictype;
|
|
lua_lock(L);
|
|
api_checknelems(L, 1);
|
|
if (tag < 0 || tag >= G(L)->ntag)
|
|
luaO_verror(L, l_s("%d is not a valid tag"), tag);
|
|
basictype = G(L)->TMtable[tag].basictype;
|
|
if (basictype != LUA_TNONE && basictype != ttype(L->top-1))
|
|
luaO_verror(L, l_s("tag %d can only be used for type '%.20s'"), tag,
|
|
basictypename(G(L), basictype));
|
|
switch (ttype(L->top-1)) {
|
|
case LUA_TTABLE:
|
|
hvalue(L->top-1)->htag = tag;
|
|
break;
|
|
case LUA_TUSERDATA:
|
|
uvalue(L->top-1)->uv.tag = tag;
|
|
break;
|
|
default:
|
|
luaO_verror(L, l_s("cannot change the tag of a %.20s"),
|
|
luaT_typename(G(L), L->top-1));
|
|
}
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_error (lua_State *L, const l_char *s) {
|
|
lua_lock(L);
|
|
luaD_error(L, s);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_unref (lua_State *L, int ref) {
|
|
if (ref >= 0) {
|
|
lua_getregistry(L);
|
|
lua_pushnil(L);
|
|
lua_rawseti(L, -2, ref);
|
|
lua_getweakregistry(L);
|
|
lua_pushnil(L);
|
|
lua_rawseti(L, -2, ref);
|
|
lua_pop(L, 2); /* remove both registries */
|
|
}
|
|
}
|
|
|
|
|
|
LUA_API int lua_next (lua_State *L, int index) {
|
|
StkId t;
|
|
Node *n;
|
|
int more;
|
|
lua_lock(L);
|
|
t = luaA_index(L, index);
|
|
api_check(L, ttype(t) == LUA_TTABLE);
|
|
n = luaH_next(L, hvalue(t), luaA_index(L, -1));
|
|
if (n) {
|
|
setobj(L->top-1, key(n));
|
|
setobj(L->top, val(n));
|
|
api_incr_top(L);
|
|
more = 1;
|
|
}
|
|
else { /* no more elements */
|
|
L->top -= 1; /* remove key */
|
|
more = 0;
|
|
}
|
|
lua_unlock(L);
|
|
return more;
|
|
}
|
|
|
|
|
|
LUA_API int lua_getn (lua_State *L, int index) {
|
|
StkId t;
|
|
const TObject *value;
|
|
int n;
|
|
lua_lock(L);
|
|
t = luaA_index(L, index);
|
|
api_check(L, ttype(t) == LUA_TTABLE);
|
|
value = luaH_getstr(hvalue(t), luaS_newliteral(L, l_s("n"))); /* = t.n */
|
|
if (ttype(value) == LUA_TNUMBER)
|
|
n = (int)nvalue(value);
|
|
else {
|
|
lua_Number max = 0;
|
|
int i = hvalue(t)->size;
|
|
Node *nd = hvalue(t)->node;
|
|
while (i--) {
|
|
if (ttype(key(nd)) == LUA_TNUMBER &&
|
|
ttype(val(nd)) != LUA_TNIL &&
|
|
nvalue(key(nd)) > max)
|
|
max = nvalue(key(nd));
|
|
nd++;
|
|
}
|
|
n = (int)max;
|
|
}
|
|
lua_unlock(L);
|
|
return n;
|
|
}
|
|
|
|
|
|
LUA_API void lua_concat (lua_State *L, int n) {
|
|
lua_lock(L);
|
|
api_checknelems(L, n);
|
|
if (n >= 2) {
|
|
luaV_strconc(L, n, L->top);
|
|
L->top -= (n-1);
|
|
luaC_checkGC(L);
|
|
}
|
|
else if (n == 0) { /* push null string */
|
|
setsvalue(L->top, luaS_newlstr(L, NULL, 0));
|
|
api_incr_top(L);
|
|
}
|
|
/* else n == 1; nothing to do */
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
static Udata *pushnewudata (lua_State *L, size_t size) {
|
|
Udata *u = luaS_newudata(L, size);
|
|
setuvalue(L->top, u);
|
|
api_incr_top(L);
|
|
return uvalue(L->top-1);
|
|
}
|
|
|
|
|
|
LUA_API void *lua_newuserdata (lua_State *L, size_t size) {
|
|
Udata *u;
|
|
void *p;
|
|
lua_lock(L);
|
|
u = pushnewudata(L, size);
|
|
p = u->uv.value;
|
|
lua_unlock(L);
|
|
return p;
|
|
}
|
|
|
|
|
|
LUA_API void lua_newuserdatabox (lua_State *L, void *p) {
|
|
Udata *u;
|
|
lua_lock(L);
|
|
u = pushnewudata(L, 0);
|
|
u->uv.value = p;
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API int lua_getweakmode (lua_State *L, int index) {
|
|
StkId t;
|
|
int mode;
|
|
lua_lock(L);
|
|
t = luaA_index(L, index);
|
|
api_check(L, ttype(t) == LUA_TTABLE);
|
|
mode = hvalue(t)->weakmode;
|
|
lua_unlock(L);
|
|
return mode;
|
|
}
|
|
|
|
|
|
LUA_API void lua_setweakmode (lua_State *L, int mode) {
|
|
lua_lock(L);
|
|
api_check(L, ttype(L->top-1) == LUA_TTABLE);
|
|
hvalue(L->top-1)->weakmode = mode;
|
|
lua_unlock(L);
|
|
}
|
|
|