new functions `lua_getfield' and `lua_setfield'

lapi.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lapi.c,v 1.244 2003/08/27 21:01:44 roberto Exp roberto $
+** $Id: lapi.c,v 1.245 2003/10/07 20:13:41 roberto Exp roberto $
 ** Lua API
 ** See Copyright Notice in lua.h
 */
@@ -498,6 +498,19 @@ LUA_API void lua_gettable (lua_State *L, int idx) {
 }
 
 
+LUA_API void lua_getfield (lua_State *L, int idx, const char *k) {
+  StkId t;
+  TObject key;
+  lua_lock(L);
+  t = luaA_index(L, idx);
+  api_checkvalidindex(L, t);
+  setsvalue(&key, luaS_new(L, k));
+  luaV_gettable(L, t, &key, L->top);
+  api_incr_top(L);
+  lua_unlock(L);
+}
+
+
 LUA_API void lua_rawget (lua_State *L, int idx) {
   StkId t;
   lua_lock(L);
@@ -582,6 +595,20 @@ LUA_API void lua_settable (lua_State *L, int idx) {
 }
 
 
+LUA_API void lua_setfield (lua_State *L, int idx, const char *k) {
+  StkId t;
+  TObject key;
+  lua_lock(L);
+  api_checknelems(L, 1);
+  t = luaA_index(L, idx);
+  api_checkvalidindex(L, t);
+  setsvalue(&key, luaS_new(L, k));
+  luaV_settable(L, t, &key, L->top - 1);
+  L->top--;  /* pop value */
+  lua_unlock(L);
+}
+
+
 LUA_API void lua_rawset (lua_State *L, int idx) {
   StkId t;
   lua_lock(L);

lauxlib.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lauxlib.c,v 1.104 2003/10/02 20:31:17 roberto Exp roberto $
+** $Id: lauxlib.c,v 1.105 2003/10/07 20:13:41 roberto Exp roberto $
 ** Auxiliary functions for building Lua libraries
 ** See Copyright Notice in lua.h
 */
@@ -108,15 +108,13 @@ LUALIB_API int luaL_findstring (const char *name, const char *const list[]) {
 
 
 LUALIB_API int luaL_newmetatable (lua_State *L, const char *tname) {
-  lua_pushstring(L, tname);
-  lua_rawget(L, LUA_REGISTRYINDEX);  /* get registry.name */
+  lua_getfield(L, LUA_REGISTRYINDEX, tname);  /* get registry.name */
   if (!lua_isnil(L, -1))  /* name already in use? */
     return 0;  /* leave previous value on top, but return 0 */
   lua_pop(L, 1);
   lua_newtable(L);  /* create metatable */
-  lua_pushstring(L, tname);
-  lua_pushvalue(L, -2);
-  lua_rawset(L, LUA_REGISTRYINDEX);  /* registry.name = metatable */
+  lua_pushvalue(L, -1);
+  lua_setfield(L, LUA_REGISTRYINDEX, tname);  /* registry.name = metatable */
   lua_pushvalue(L, -1);
   lua_pushstring(L, tname);
   lua_rawset(L, LUA_REGISTRYINDEX);  /* registry[metatable] = name */
@@ -125,8 +123,7 @@ LUALIB_API int luaL_newmetatable (lua_State *L, const char *tname) {
 
 
 LUALIB_API void  luaL_getmetatable (lua_State *L, const char *tname) {
-  lua_pushstring(L, tname);
-  lua_rawget(L, LUA_REGISTRYINDEX);
+  lua_getfield(L, LUA_REGISTRYINDEX, tname);
 }
 
 
@@ -215,8 +212,7 @@ LUALIB_API lua_Integer luaL_optinteger (lua_State *L, int narg,
 LUALIB_API int luaL_getmetafield (lua_State *L, int obj, const char *event) {
   if (!lua_getmetatable(L, obj))  /* no metatable? */
     return 0;
-  lua_pushstring(L, event);
-  lua_rawget(L, -2);
+  lua_getfield(L, -1, event);
   if (lua_isnil(L, -1)) {
     lua_pop(L, 2);  /* remove metatable and metafield */
     return 0;
@@ -241,24 +237,23 @@ LUALIB_API int luaL_callmeta (lua_State *L, int obj, const char *event) {
 LUALIB_API void luaL_openlib (lua_State *L, const char *libname,
                               const luaL_reg *l, int nup) {
   if (libname) {
-    lua_pushstring(L, libname);
-    lua_gettable(L, LUA_GLOBALSINDEX);  /* check whether lib already exists */
+    /* check whether lib already exists */
+    lua_getfield(L, LUA_GLOBALSINDEX, libname);
     if (lua_isnil(L, -1)) {  /* no? */
       lua_pop(L, 1);
       lua_newtable(L);  /* create it */
-      lua_pushstring(L, libname);
-      lua_pushvalue(L, -2);
-      lua_settable(L, LUA_GLOBALSINDEX);  /* register it with given name */
+      lua_pushvalue(L, -1);
+      /* register it with given name */
+      lua_setfield(L, LUA_GLOBALSINDEX, libname);
     }
     lua_insert(L, -(nup+1));  /* move library table to below upvalues */
   }
   for (; l->name; l++) {
     int i;
-    lua_pushstring(L, l->name);
     for (i=0; i<nup; i++)  /* copy upvalues to the top */
-      lua_pushvalue(L, -(nup+1));
+      lua_pushvalue(L, -nup);
     lua_pushcclosure(L, l->func, nup);
-    lua_settable(L, -(nup+3));
+    lua_setfield(L, -(nup+2), l->name);
   }
   lua_pop(L, nup);  /* remove upvalues */
 }
@@ -286,9 +281,8 @@ static void getsizes (lua_State *L) {
     lua_newtable(L);  /* create it */
     lua_pushvalue(L, -1);  /* `size' will be its own metatable */
     lua_setmetatable(L, -2);
-    lua_pushliteral(L, "__mode");
     lua_pushliteral(L, "kv");
-    lua_rawset(L, -3);  /* metatable(N).__mode = "kv" */
+    lua_setfield(L, -2, "__mode");  /* metatable(N).__mode = "kv" */
     lua_pushvalue(L, -1);
     lua_rawseti(L, LUA_REGISTRYINDEX, ARRAYSIZE_REF);  /* store in register */
   }
@@ -297,12 +291,10 @@ static void getsizes (lua_State *L) {
 
 void luaL_setn (lua_State *L, int t, int n) {
   t = abs_index(L, t);
-  lua_pushliteral(L, "n");
-  lua_rawget(L, t);
+  lua_getfield(L, t, "n");
   if (checkint(L, 1) >= 0) {  /* is there a numeric field `n'? */
-    lua_pushliteral(L, "n");  /* use it */
     lua_pushinteger(L, n);
-    lua_rawset(L, t);
+    lua_setfield(L, t, "n");
   }
   else {  /* use `sizes' */
     getsizes(L);
@@ -317,8 +309,7 @@ void luaL_setn (lua_State *L, int t, int n) {
 int luaL_getn (lua_State *L, int t) {
   int n;
   t = abs_index(L, t);
-  lua_pushliteral(L, "n");  /* try t.n */
-  lua_rawget(L, t);
+  lua_getfield(L, t, "n");  /* try t.n */
   if ((n = checkint(L, 1)) >= 0) return n;
   getsizes(L);  /* else try sizes[t] */
   lua_pushvalue(L, t);

lbaselib.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lbaselib.c,v 1.133 2003/08/27 21:02:08 roberto Exp roberto $
+** $Id: lbaselib.c,v 1.134 2003/10/07 20:13:41 roberto Exp roberto $
 ** Basic library
 ** See Copyright Notice in lua.h
 */
@@ -220,8 +220,7 @@ static int luaB_next (lua_State *L) {
 
 static int luaB_pairs (lua_State *L) {
   luaL_checktype(L, 1, LUA_TTABLE);
-  lua_pushliteral(L, "next");
-  lua_rawget(L, LUA_GLOBALSINDEX);  /* return generator, */
+  lua_getfield(L, LUA_GLOBALSINDEX, "next");  /* return generator, */
   lua_pushvalue(L, 1);  /* state, */
   lua_pushnil(L);  /* and initial value */
   return 3;
@@ -232,8 +231,7 @@ static int luaB_ipairs (lua_State *L) {
   int i = (int)lua_tointeger(L, 2);
   luaL_checktype(L, 1, LUA_TTABLE);
   if (i == 0 && lua_isnone(L, 2)) {  /* `for' start? */
-    lua_pushliteral(L, "ipairs");
-    lua_rawget(L, LUA_GLOBALSINDEX);  /* return generator, */
+    lua_getfield(L, LUA_GLOBALSINDEX, "ipairs");  /* return generator, */
     lua_pushvalue(L, 1);  /* state, */
     lua_pushinteger(L, 0);  /* and initial value */
     return 3;
@@ -693,23 +691,19 @@ static const luaL_reg co_funcs[] = {
 
 
 static void base_open (lua_State *L) {
-  lua_pushliteral(L, "_G");
   lua_pushvalue(L, LUA_GLOBALSINDEX);
   luaL_openlib(L, NULL, base_funcs, 0);  /* open lib into global table */
-  lua_pushliteral(L, "_VERSION");
   lua_pushliteral(L, LUA_VERSION);
-  lua_rawset(L, -3);  /* set global _VERSION */
+  lua_setfield(L, -2, "_VERSION");  /* set global _VERSION */
   /* `newproxy' needs a weaktable as upvalue */
-  lua_pushliteral(L, "newproxy");
   lua_newtable(L);  /* new table `w' */
   lua_pushvalue(L, -1);  /* `w' will be its own metatable */
   lua_setmetatable(L, -2);
-  lua_pushliteral(L, "__mode");
   lua_pushliteral(L, "kv");
-  lua_rawset(L, -3);  /* metatable(w).__mode = "kv" */
+  lua_setfield(L, -2, "__mode");  /* metatable(w).__mode = "kv" */
   lua_pushcclosure(L, luaB_newproxy, 1);
-  lua_rawset(L, -3);  /* set global `newproxy' */
-  lua_rawset(L, -1);  /* set global _G */
+  lua_setfield(L, -2, "newproxy");  /* set global `newproxy' */
+  lua_setfield(L, -1, "_G");  /* set global _G */
 }
 
 

ldblib.c

@@ -1,5 +1,5 @@
 /*
-** $Id: ldblib.c,v 1.81 2003/07/07 13:37:08 roberto Exp roberto $
+** $Id: ldblib.c,v 1.82 2003/10/07 20:13:41 roberto Exp roberto $
 ** Interface from Lua to its debug API
 ** See Copyright Notice in lua.h
 */
@@ -19,16 +19,14 @@
 
 
 static void settabss (lua_State *L, const char *i, const char *v) {
-  lua_pushstring(L, i);
   lua_pushstring(L, v);
-  lua_rawset(L, -3);
+  lua_setfield(L, -2, i);
 }
 
 
 static void settabsi (lua_State *L, const char *i, int v) {
-  lua_pushstring(L, i);
   lua_pushinteger(L, v);
-  lua_rawset(L, -3);
+  lua_setfield(L, -2, i);
 }
 
 
@@ -85,12 +83,11 @@ static int getinfo (lua_State *L) {
         settabss(L, "namewhat", ar.namewhat);
         break;
       case 'f':
-        lua_pushliteral(L, "func");
         if (L == L1)
-          lua_pushvalue(L, -3);
+          lua_pushvalue(L, -2);
         else
           lua_xmove(L1, L, 1);
-        lua_rawset(L, -3);
+        lua_setfield(L, -2, "func");
         break;
     }
   }
@@ -341,9 +338,8 @@ static const luaL_reg dblib[] = {
 
 LUALIB_API int luaopen_debug (lua_State *L) {
   luaL_openlib(L, LUA_DBLIBNAME, dblib, 0);
-  lua_pushliteral(L, "_TRACEBACK");
   lua_pushcfunction(L, errorfb);
-  lua_settable(L, LUA_GLOBALSINDEX);
+  lua_setfield(L, LUA_GLOBALSINDEX, "_TRACEBACK");
   return 1;
 }
 

liolib.c

@@ -1,5 +1,5 @@
 /*
-** $Id: liolib.c,v 2.46 2003/08/25 19:49:47 roberto Exp roberto $
+** $Id: liolib.c,v 2.47 2003/10/07 20:13:41 roberto Exp roberto $
 ** Standard I/O (and system) library
 ** See Copyright Notice in lua.h
 */
@@ -236,8 +236,7 @@ static int io_readline (lua_State *L);
 
 
 static void aux_lines (lua_State *L, int idx, int close) {
-  lua_pushliteral(L, FILEHANDLE);
-  lua_rawget(L, LUA_REGISTRYINDEX);
+  lua_getfield(L, LUA_REGISTRYINDEX, FILEHANDLE);
   lua_pushvalue(L, idx);
   lua_pushboolean(L, close);  /* close/not close file when finished */
   lua_pushcclosure(L, io_readline, 3);
@@ -512,9 +511,8 @@ static void createmeta (lua_State *L) {
   *newfile(L) = stdout;
   lua_rawseti(L, -2, IO_OUTPUT);
   /* file methods */
-  lua_pushliteral(L, "__index");
-  lua_pushvalue(L, -2);  /* push metatable */
-  lua_rawset(L, -3);  /* metatable.__index = metatable */
+  lua_pushvalue(L, -1);  /* push metatable */
+  lua_setfield(L, -2, "__index");  /* metatable.__index = metatable */
   luaL_openlib(L, NULL, flib, 0);
 }
 
@@ -594,8 +592,7 @@ static void setboolfield (lua_State *L, const char *key, int value) {
 
 static int getboolfield (lua_State *L, const char *key) {
   int res;
-  lua_pushstring(L, key);
-  lua_gettable(L, -2);
+  lua_getfield(L, -1, key);
   res = lua_toboolean(L, -1);
   lua_pop(L, 1);
   return res;
@@ -604,8 +601,7 @@ static int getboolfield (lua_State *L, const char *key) {
 
 static int getfield (lua_State *L, const char *key, int d) {
   int res;
-  lua_pushstring(L, key);
-  lua_gettable(L, -2);
+  lua_getfield(L, -1, key);
   if (lua_isnumber(L, -1))
     res = (int)lua_tointeger(L, -1);
   else {

lmathlib.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lmathlib.c,v 1.56 2003/03/11 12:30:37 roberto Exp roberto $
+** $Id: lmathlib.c,v 1.57 2003/10/07 20:13:41 roberto Exp roberto $
 ** Standard mathematical library
 ** See Copyright Notice in lua.h
 */
@@ -235,12 +235,10 @@ static const luaL_reg mathlib[] = {
 */
 LUALIB_API int luaopen_math (lua_State *L) {
   luaL_openlib(L, LUA_MATHLIBNAME, mathlib, 0);
-  lua_pushliteral(L, "pi");
   lua_pushnumber(L, PI);
-  lua_settable(L, -3);
-  lua_pushliteral(L, "__pow");
+  lua_setfield(L, -2, "pi");
   lua_pushcfunction(L, math_pow);
-  lua_settable(L, LUA_GLOBALSINDEX);
+  lua_setfield(L, LUA_GLOBALSINDEX, "__pow");
   return 1;
 }
 

lua.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lua.h,v 1.179 2003/10/02 20:31:17 roberto Exp roberto $
+** $Id: lua.h,v 1.180 2003/10/07 20:13:41 roberto Exp roberto $
 ** Lua - An Extensible Extension Language
 ** Tecgraf: Computer Graphics Technology Group, PUC-Rio, Brazil
 ** http://www.lua.org	mailto:[email protected]
@@ -182,6 +182,7 @@ LUA_API void  lua_pushlightuserdata (lua_State *L, void *p);
 ** get functions (Lua -> stack)
 */
 LUA_API void  lua_gettable (lua_State *L, int idx);
+LUA_API void  lua_getfield (lua_State *L, int idx, const char *k);
 LUA_API void  lua_rawget (lua_State *L, int idx);
 LUA_API void  lua_rawgeti (lua_State *L, int idx, int n);
 LUA_API void  lua_newtable (lua_State *L);
@@ -194,6 +195,7 @@ LUA_API void  lua_getfenv (lua_State *L, int idx);
 ** set functions (stack -> Lua)
 */
 LUA_API void  lua_settable (lua_State *L, int idx);
+LUA_API void  lua_setfield (lua_State *L, int idx, const char *k);
 LUA_API void  lua_rawset (lua_State *L, int idx);
 LUA_API void  lua_rawseti (lua_State *L, int idx, int n);
 LUA_API int   lua_setmetatable (lua_State *L, int objindex);