mirror of
https://github.com/lua/lua
synced 2024-12-14 06:47:15 +03:00
380 lines
7.7 KiB
C
380 lines
7.7 KiB
C
/*
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** $Id: lapi.c,v 1.90 2000/08/29 20:43:28 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 "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 "lvm.h"
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const char lua_ident[] = "$Lua: " LUA_VERSION " " LUA_COPYRIGHT " $\n"
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"$Authors: " LUA_AUTHORS " $";
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#define Index(L,i) ((i) >= 0 ? (L->Cbase+((i)-1)) : (L->top+(i)))
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#define api_incr_top(L) (++L->top)
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TObject *luaA_index (lua_State *L, int index) {
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return Index(L, index);
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}
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void luaA_pushobject (lua_State *L, const TObject *o) {
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*L->top = *o;
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incr_top;
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}
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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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int lua_gettop (lua_State *L) {
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return (L->top - L->Cbase);
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}
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void lua_settop (lua_State *L, int index) {
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if (index >= 0)
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luaD_adjusttop(L, L->Cbase, index);
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else
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L->top += index; /* index is negative */
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}
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void lua_pushobject (lua_State *L, int index) {
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*L->top = *Index(L, index);
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api_incr_top(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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#define btest(L,i,value,default) { \
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StkId o; \
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if ((i) >= 0) { \
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o = L->Cbase+((i)-1); \
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if (o >= L->top) return (default); \
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} \
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else o = L->top+(i); \
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return (value); }
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#define access(L,i,test,default,value) { \
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StkId o; \
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if ((i) >= 0) { \
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o = L->Cbase+((i)-1); \
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if (o >= L->top) return (default); \
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} \
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else o = L->top+(i); \
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return ((test) ? (value) : (default)); }
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const char *lua_type (lua_State *L, int index) {
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btest(L, index, luaO_typename(o), "NO VALUE");
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}
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int lua_iscfunction (lua_State *L, int index) {
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btest(L, index, (ttype(o) == TAG_CCLOSURE), 0);
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}
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int lua_isnumber (lua_State *L, int index) {
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btest(L, index, (tonumber(Index(L, index)) == 0), 0);
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}
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int lua_tag (lua_State *L, int index) {
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btest(L, index,
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((ttype(o) == TAG_USERDATA) ? tsvalue(o)->u.d.tag : luaT_effectivetag(L, o)),
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-1);
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}
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int lua_equal(lua_State *L, int index1, int index2) {
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StkId o1 = Index(L, index1);
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StkId o2 = Index(L, index2);
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if (o1 >= L->top || o2 >= L->top) return 0; /* index out-of-range */
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else return luaO_equalObj(o1, o2);
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}
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double lua_tonumber (lua_State *L, int index) {
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access(L, index, (tonumber(o) == 0), 0.0, nvalue(o));
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}
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const char *lua_tostring (lua_State *L, int index) {
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luaC_checkGC(L); /* `tostring' may create a new string */
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access(L, index, (tostring(L, o) == 0), NULL, svalue(o));
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}
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size_t lua_strlen (lua_State *L, int index) {
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access(L, index, (tostring(L, o) == 0), 0, tsvalue(o)->u.s.len);
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}
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lua_CFunction lua_tocfunction (lua_State *L, int index) {
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access(L, index, (ttype(o) == TAG_CCLOSURE), NULL, clvalue(o)->f.c);
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}
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void *lua_touserdata (lua_State *L, int index) {
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access(L, index, (ttype(o) == TAG_USERDATA), NULL, tsvalue(o)->u.d.value);
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}
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/*
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** push functions (C -> stack)
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*/
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void lua_pushnil (lua_State *L) {
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ttype(L->top) = TAG_NIL;
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api_incr_top(L);
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}
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void lua_pushnumber (lua_State *L, double n) {
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ttype(L->top) = TAG_NUMBER;
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nvalue(L->top) = n;
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api_incr_top(L);
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}
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void lua_pushlstring (lua_State *L, const char *s, size_t len) {
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luaC_checkGC(L);
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tsvalue(L->top) = luaS_newlstr(L, s, len);
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ttype(L->top) = TAG_STRING;
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api_incr_top(L);
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}
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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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void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) {
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luaC_checkGC(L);
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luaV_Cclosure(L, fn, n);
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}
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void lua_pushusertag (lua_State *L, void *u, int tag) { /* ORDER LUA_T */
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luaC_checkGC(L);
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if (tag != LUA_ANYTAG && tag != TAG_USERDATA && tag < NUM_TAGS)
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luaL_verror(L, "invalid tag for a userdata (%d)", tag);
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tsvalue(L->top) = luaS_createudata(L, u, tag);
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ttype(L->top) = TAG_USERDATA;
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api_incr_top(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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void lua_getglobal (lua_State *L, const char *name) {
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luaV_getglobal(L, luaS_new(L, name), L->top++);
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}
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void lua_gettable (lua_State *L) {
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luaV_gettable(L, L->top--);
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}
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void lua_rawget (lua_State *L) {
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if (ttype(L->top - 2) != TAG_TABLE)
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lua_error(L, "indexed expression not a table");
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*(L->top - 2) = *luaH_get(L, hvalue(L->top - 2), L->top - 1);
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L->top--;
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}
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void lua_getglobals (lua_State *L) {
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hvalue(L->top) = L->gt;
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ttype(L->top) = TAG_TABLE;
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api_incr_top(L);
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}
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void lua_gettagmethod (lua_State *L, int tag, const char *event) {
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*L->top = *luaT_gettagmethod(L, tag, event);
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api_incr_top(L);
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}
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int lua_getref (lua_State *L, int ref) {
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if (ref == LUA_REFNIL)
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ttype(L->top) = TAG_NIL;
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else if (0 <= ref && ref < L->refSize &&
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(L->refArray[ref].st == LOCK || L->refArray[ref].st == HOLD))
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*L->top = L->refArray[ref].o;
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else
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return 0;
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api_incr_top(L);
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return 1;
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}
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void lua_newtable (lua_State *L) {
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luaC_checkGC(L);
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hvalue(L->top) = luaH_new(L, 0);
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ttype(L->top) = TAG_TABLE;
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api_incr_top(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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void lua_setglobal (lua_State *L, const char *name) {
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luaV_setglobal(L, luaS_new(L, name), L->top--);
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}
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void lua_settable (lua_State *L) {
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StkId top = L->top;
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luaV_settable(L, top-3, top);
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L->top = top-3; /* pop table, index, and value */
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}
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void lua_rawset (lua_State *L) {
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if (ttype(L->top-3) != TAG_TABLE)
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lua_error(L, "indexed expression not a table");
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*luaH_set(L, hvalue(L->top-3), L->top-2) = *(L->top-1);
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L->top -= 3;
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}
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void lua_setglobals (lua_State *L) {
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TObject *newtable = --L->top;
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if (ttype(newtable) != TAG_TABLE)
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lua_error(L, "Lua API error - invalid value for global table");
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L->gt = hvalue(newtable);
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}
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void lua_settagmethod (lua_State *L, int tag, const char *event) {
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TObject *method = L->top - 1;
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if (ttype(method) != TAG_NIL &&
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ttype(method) != TAG_CCLOSURE &&
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ttype(method) != TAG_LCLOSURE)
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lua_error(L, "Lua API error - tag method must be a function or nil");
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luaT_settagmethod(L, tag, event, method);
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}
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int lua_ref (lua_State *L, int lock) {
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int ref;
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if (ttype(L->top-1) == TAG_NIL)
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ref = LUA_REFNIL;
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else {
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if (L->refFree != NONEXT) { /* is there a free place? */
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ref = L->refFree;
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L->refFree = L->refArray[ref].st;
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}
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else { /* no more free places */
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luaM_growvector(L, L->refArray, L->refSize, 1, struct Ref,
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"reference table overflow", MAX_INT);
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ref = L->refSize++;
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}
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L->refArray[ref].o = *(L->top-1);
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L->refArray[ref].st = lock ? LOCK : HOLD;
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}
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L->top--;
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return ref;
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}
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/*
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** miscellaneous functions
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*/
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void lua_settag (lua_State *L, int tag) {
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luaT_realtag(L, tag);
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switch (ttype(L->top-1)) {
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case TAG_TABLE:
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hvalue(L->top-1)->htag = tag;
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break;
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case TAG_USERDATA:
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tsvalue(L->top-1)->u.d.tag = tag;
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break;
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default:
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luaL_verror(L, "cannot change the tag of a %.20s",
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luaO_typename(L->top-1));
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}
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L->top--;
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}
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void lua_unref (lua_State *L, int ref) {
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if (ref >= 0) {
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if (ref >= L->refSize || L->refArray[ref].st >= 0)
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lua_error(L, "Lua API error - "
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"invalid argument for function `lua_unref'");
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L->refArray[ref].st = L->refFree;
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L->refFree = ref;
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}
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}
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int lua_next (lua_State *L) {
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const TObject *t = Index(L, -2);
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Node *n;
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if (ttype(t) != TAG_TABLE)
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lua_error(L, "Lua API error - object is not a table in `lua_next'");
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n = luaH_next(L, hvalue(t), Index(L, -1));
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if (n) {
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*(L->top-1) = *key(n);
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*L->top = *val(n);
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api_incr_top(L);
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return 1;
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}
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else { /* no more elements */
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L->top -= 2; /* remove key and table */
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return 0;
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}
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}
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