mirror of
https://github.com/lua/lua
synced 2024-11-29 16:13:17 +03:00
740 lines
15 KiB
C
740 lines
15 KiB
C
/*
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** $Id: lapi.c,v 1.199 2002/06/13 13:44:50 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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#include "lua.h"
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#include "lapi.h"
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#include "ldebug.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 "lundump.h"
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#include "lvm.h"
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const char lua_ident[] =
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"$Lua: " LUA_VERSION " " LUA_COPYRIGHT " $\n"
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"$Authors: " LUA_AUTHORS " $\n"
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"$URL: www.lua.org $\n";
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#ifndef api_check
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#define api_check(L, o) ((void)1)
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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) (api_check(L, L->top<L->ci->top), L->top++)
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static TObject *negindex (lua_State *L, int index) {
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if (index > LUA_REGISTRYINDEX) {
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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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else switch (index) { /* pseudo-indices */
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case LUA_REGISTRYINDEX: return registry(L);
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case LUA_GLOBALSINDEX: return gt(L);
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default: {
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TObject *func = (L->ci->base - 1);
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index = LUA_GLOBALSINDEX - index;
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api_check(L, iscfunction(func) && index <= clvalue(func)->c.nupvalues);
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return &clvalue(func)->c.upvalue[index-1];
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}
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}
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}
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#define luaA_index(L, index) \
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( (index > 0) ? \
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(api_check(L, index <= L->top - L->ci->base), L->ci->base+index-1) : \
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negindex(L, index))
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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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return negindex(L, index);
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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(L);
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}
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LUA_API int lua_checkstack (lua_State *L, int size) {
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int res;
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lua_lock(L);
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if ((L->top - L->ci->base + size) > LUA_MAXCSTACK)
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res = 0; /* stack overflow */
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else {
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luaD_checkstack(L, size);
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if (L->ci->top < L->top + size)
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L->ci->top = L->top + size;
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res = 1;
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}
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lua_unlock(L);
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return res;
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}
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LUA_API lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf) {
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lua_CFunction old;
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lua_lock(L);
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old = G(L)->panic;
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G(L)->panic = panicf;
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lua_unlock(L);
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return old;
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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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while (L->top < L->ci->base + index)
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setnilvalue(L->top++);
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L->top = 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_replace (lua_State *L, int index) {
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lua_lock(L);
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api_checknelems(L, 1);
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setobj(luaA_index(L, index), 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_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 char *lua_typename (lua_State *L, int t) {
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UNUSED(L);
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return (t == LUA_TNONE) ? "no value" : luaT_typenames[t];
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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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const TObject *o = luaA_indexAcceptable(L, index);
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return (o != NULL && 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_rawequal (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_rawequalObj(o1, o2);
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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, 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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: equalobj(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 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 && tonumber(o, &n))
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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 int lua_toboolean (lua_State *L, int index) {
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const TObject *o = luaA_indexAcceptable(L, index);
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return (o != NULL) && !l_isfalse(o);
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}
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LUA_API const 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 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) ? 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) ? 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)->c.f;
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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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if (o == NULL) return NULL;
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switch (ttype(o)) {
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case LUA_TUSERDATA: return (uvalue(o) + 1);
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case LUA_TUDATAVAL: return pvalue(o);
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default: return NULL;
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}
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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 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 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 const char *lua_pushvfstring (lua_State *L, const char *fmt,
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va_list argp) {
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const char *ret;
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lua_lock(L);
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ret = luaO_pushvfstring(L, fmt, argp);
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lua_unlock(L);
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return ret;
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}
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LUA_API const char *lua_pushfstring (lua_State *L, const char *fmt, ...) {
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const char *ret;
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va_list argp;
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lua_lock(L);
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va_start(argp, fmt);
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ret = luaO_pushvfstring(L, fmt, argp);
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va_end(argp);
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lua_unlock(L);
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return ret;
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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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Closure *cl;
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lua_lock(L);
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api_checknelems(L, n);
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cl = luaF_newCclosure(L, n);
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cl->c.f = fn;
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L->top -= n;
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while (n--)
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setobj(&cl->c.upvalue[n], L->top+n);
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setclvalue(L->top, cl);
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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_pushboolean (lua_State *L, int b) {
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lua_lock(L);
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setbvalue(L->top, (b != 0)); /* ensure that true is 1 */
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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_pushudataval (lua_State *L, void *p) {
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lua_lock(L);
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setpvalue(L->top, p);
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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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** get functions (Lua -> stack)
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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_newtable (lua_State *L) {
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lua_lock(L);
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sethvalue(L->top, luaH_new(L, 0, 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 int lua_getmetatable (lua_State *L, int objindex) {
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StkId obj;
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Table *mt;
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int res;
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lua_lock(L);
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obj = luaA_indexAcceptable(L, objindex);
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switch (ttype(obj)) {
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case LUA_TTABLE:
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mt = hvalue(obj)->metatable;
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break;
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case LUA_TUSERDATA:
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mt = uvalue(obj)->uv.metatable;
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break;
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default:
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mt = hvalue(defaultmeta(L));
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}
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if (mt == hvalue(defaultmeta(L)))
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res = 0;
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else {
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sethvalue(L->top, mt);
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api_incr_top(L);
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res = 1;
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}
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lua_unlock(L);
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return res;
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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_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_setmetatable (lua_State *L, int objindex) {
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StkId obj, mt;
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lua_lock(L);
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api_checknelems(L, 1);
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obj = luaA_index(L, objindex);
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mt = --L->top;
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if (ttype(mt) == LUA_TNIL)
|
|
mt = defaultmeta(L);
|
|
api_check(L, ttype(mt) == LUA_TTABLE);
|
|
switch (ttype(obj)) {
|
|
case LUA_TTABLE:
|
|
hvalue(obj)->metatable = hvalue(mt);
|
|
break;
|
|
case LUA_TUSERDATA:
|
|
uvalue(obj)->uv.metatable = hvalue(mt);
|
|
break;
|
|
default:
|
|
luaG_runerror(L, "cannot change the meta table of a %s",
|
|
luaT_typenames[ttype(obj)]);
|
|
}
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
/*
|
|
** `load' and `call' functions (run Lua code)
|
|
*/
|
|
|
|
LUA_API void lua_upcall (lua_State *L, int nargs, int nresults) {
|
|
StkId func;
|
|
lua_lock(L);
|
|
api_checknelems(L, nargs+1);
|
|
func = L->top - (nargs+1);
|
|
luaD_call(L, func, nresults);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API int lua_pcall (lua_State *L, int nargs, int nresults) {
|
|
int status;
|
|
lua_lock(L);
|
|
status = luaD_pcall(L, nargs, nresults);
|
|
lua_unlock(L);
|
|
return status;
|
|
}
|
|
|
|
|
|
LUA_API int lua_load (lua_State *L, lua_Chunkreader reader, void *data,
|
|
const char *chunkname) {
|
|
ZIO z;
|
|
int status;
|
|
int c;
|
|
lua_lock(L);
|
|
if (!chunkname) chunkname = "?";
|
|
luaZ_init(&z, reader, data, chunkname);
|
|
c = luaZ_lookahead(&z);
|
|
status = luaD_protectedparser(L, &z, (c == LUA_SIGNATURE[0]));
|
|
lua_unlock(L);
|
|
return status;
|
|
}
|
|
|
|
|
|
/*
|
|
** Garbage-collection functions
|
|
*/
|
|
|
|
/* GC values are expressed in Kbytes: #bytes/2^10 */
|
|
#define GCscale(x) (cast(int, (x)>>10))
|
|
#define GCunscale(x) (cast(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_error (lua_State *L) {
|
|
lua_lock(L);
|
|
api_checknelems(L, 1);
|
|
luaG_errormsg(L, 0);
|
|
lua_unlock(L);
|
|
return 0; /* to avoid warnings */
|
|
}
|
|
|
|
|
|
LUA_API int lua_next (lua_State *L, int index) {
|
|
StkId t;
|
|
int more;
|
|
lua_lock(L);
|
|
t = luaA_index(L, index);
|
|
api_check(L, ttype(t) == LUA_TTABLE);
|
|
more = luaH_next(L, hvalue(t), L->top - 1);
|
|
if (more) {
|
|
api_incr_top(L);
|
|
}
|
|
else /* no more elements */
|
|
L->top -= 1; /* remove key */
|
|
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, "n")); /* = t.n */
|
|
if (ttype(value) == LUA_TNUMBER)
|
|
lua_number2int(n, nvalue(value));
|
|
else {
|
|
Node *nd;
|
|
Table *a = hvalue(t);
|
|
lua_Number max = 0;
|
|
int i;
|
|
i = sizearray(a);
|
|
while (i--) {
|
|
if (ttype(&a->array[i]) != LUA_TNIL)
|
|
break;
|
|
}
|
|
max = i+1;
|
|
i = sizenode(a);
|
|
nd = a->node;
|
|
while (i--) {
|
|
if (ttype(key(nd)) == LUA_TNUMBER &&
|
|
ttype(val(nd)) != LUA_TNIL &&
|
|
nvalue(key(nd)) > max)
|
|
max = nvalue(key(nd));
|
|
nd++;
|
|
}
|
|
lua_number2int(n, 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_concat(L, n, L->top - L->ci->base - 1);
|
|
L->top -= (n-1);
|
|
luaC_checkGC(L);
|
|
}
|
|
else if (n == 0) { /* push empty string */
|
|
setsvalue(L->top, luaS_newlstr(L, NULL, 0));
|
|
api_incr_top(L);
|
|
}
|
|
/* else n == 1; nothing to do */
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void *lua_newuserdata (lua_State *L, size_t size) {
|
|
Udata *u;
|
|
lua_lock(L);
|
|
u = luaS_newudata(L, size);
|
|
setuvalue(L->top, u);
|
|
api_incr_top(L);
|
|
lua_unlock(L);
|
|
return u + 1;
|
|
}
|
|
|
|
|
|
LUA_API int lua_pushupvalues (lua_State *L) {
|
|
TObject *func;
|
|
int n, i;
|
|
lua_lock(L);
|
|
func = (L->ci->base - 1);
|
|
api_check(L, iscfunction(func));
|
|
n = clvalue(func)->c.nupvalues;
|
|
luaD_checkstack(L, n + LUA_MINSTACK);
|
|
for (i=0; i<n; i++) {
|
|
setobj(L->top, &clvalue(func)->c.upvalue[i]);
|
|
L->top++;
|
|
}
|
|
lua_unlock(L);
|
|
return n;
|
|
}
|
|
|
|
|