/* * wslua_internals.c * * Wireshark's interface to the Lua Programming Language * * This file is for internal WSLUA functions - not ones exposed into Lua. * * (c) 2013, Hadriel Kaplan * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "config.h" #include "wslua.h" #include /* ws_debug_printf */ /* Several implementation details (__getters, __setters, __methods) were exposed * to Lua code. These are normally not used by dissectors, just for debugging * (and the "wslua global" test). Enable by setting WSLUA_WITH_INTROSPECTION */ #define WSLUA_WITH_INTROSPECTION #if LUA_VERSION_NUM == 501 /* Compatibility with Lua 5.1, function was added in 5.2 */ static int lua_absindex(lua_State *L, int idx) { return (idx > 0 || idx <= LUA_REGISTRYINDEX) ? idx : lua_gettop(L) + 1 + idx; } #endif WSLUA_API int wslua__concat(lua_State* L) { /* Concatenate two objects to a string */ if (!luaL_callmeta(L,1,"__tostring")) lua_pushvalue(L,1); if (!luaL_callmeta(L,2,"__tostring")) lua_pushvalue(L,2); lua_concat(L,2); return 1; } /* like lua_toboolean, except only coerces int, nil, and bool, and errors on other types. note that normal lua_toboolean returns 1 for any Lua value different from false and nil; otherwise it returns 0. So a string would give a 0, as would a number of 1. This function errors if the arg is a string, and sets the boolean to 1 for any number other than 0. Like toboolean, this returns FALSE if the arg was missing. */ WSLUA_API gboolean wslua_toboolean(lua_State* L, int n) { gboolean val = FALSE; if ( lua_isboolean(L,n) || lua_isnil(L,n) || lua_gettop(L) < n ) { val = lua_toboolean(L,n); } else if ( lua_type(L,n) == LUA_TNUMBER ) { int num = (int)luaL_checkinteger(L,n); val = num != 0 ? TRUE : FALSE; } else { luaL_argerror(L,n,"must be a boolean or number"); } return val; } /* like luaL_checkinteger, except for booleans - this does not coerce other types */ WSLUA_API gboolean wslua_checkboolean(lua_State* L, int n) { if (!lua_isboolean(L,n) ) { luaL_argerror(L,n,"must be a boolean"); } return lua_toboolean(L,n);; } WSLUA_API gboolean wslua_optbool(lua_State* L, int n, gboolean def) { gboolean val = FALSE; if ( lua_isboolean(L,n) ) { val = lua_toboolean(L,n); } else if ( lua_isnil(L,n) || lua_gettop(L) < n ){ val = def; } else { luaL_argerror(L,n,"must be a boolean"); } return val; } /* like lua_tointeger, except only coerces int, nil, and bool, and errors on other types. note that normal lua_tointeger does not coerce nil or bool, but does coerce strings. */ WSLUA_API lua_Integer wslua_tointeger(lua_State* L, int n) { lua_Integer val = 0; if ( lua_type(L,n) == LUA_TNUMBER) { val = lua_tointeger(L,n); } else if ( lua_isboolean(L,n) ) { val = (lua_Integer) (lua_toboolean(L,n)); } else if ( lua_isnil(L,n) ) { val = 0; } else { luaL_argerror(L,n,"must be a integer, boolean or nil"); } return val; } /* like luaL_optint, except converts/handles Lua booleans as well */ WSLUA_API int wslua_optboolint(lua_State* L, int n, int def) { int val = 0; if ( lua_isnumber(L,n) ) { val = (int)lua_tointeger(L,n); } else if ( lua_isboolean(L,n) ) { val = lua_toboolean(L,n) ? 1 : 0; } else if ( lua_isnil(L,n) || lua_gettop(L) < n ){ val = def; } else { luaL_argerror(L,n,"must be a boolean or integer"); } return val; } /* like luaL_checklstring, except no coercion */ WSLUA_API const char* wslua_checklstring_only(lua_State* L, int n, size_t *l) { if (lua_type(L,n) != LUA_TSTRING) { luaL_argerror(L,n,"must be a Lua string"); } return luaL_checklstring(L, n, l); } /* like luaL_checkstring, except no coercion */ WSLUA_API const char* wslua_checkstring_only(lua_State* L, int n) { return wslua_checklstring_only(L, n, NULL); } /* following is based on the luaL_setfuncs() from Lua 5.2, so we can use it in pre-5.2 */ WSLUA_API void wslua_setfuncs(lua_State *L, const luaL_Reg *l, int nup) { luaL_checkstack(L, nup, "too many upvalues"); for (; l->name != NULL; l++) { /* fill the table with given functions */ int i; for (i = 0; i < nup; i++) /* copy upvalues to the top */ lua_pushvalue(L, -nup); lua_pushcclosure(L, l->func, nup); /* closure with those upvalues */ lua_setfield(L, -(nup + 2), l->name); } lua_pop(L, nup); /* remove upvalues */ } /** * Identical to lua_getfield, but without triggering the __newindex metamethod. * The resulting value is returned on the Lua stack. */ static void lua_rawgetfield(lua_State *L, int idx, const char *k) { idx = lua_absindex(L, idx); lua_pushstring(L, k); lua_rawget(L, idx); } /** * Identical to lua_setfield, but without triggering the __newindex metamethod. * The value to be set is taken from the Lua stack. */ static void lua_rawsetfield (lua_State *L, int idx, const char *k) { idx = lua_absindex(L, idx); lua_pushstring(L, k); lua_insert(L, -2); lua_rawset(L, idx); } WSLUA_API void wslua_print_stack(char* s, lua_State* L) { int i; for (i=1;i<=lua_gettop(L);i++) { ws_debug_printf("%s-%i: %s\n",s,i,lua_typename (L,lua_type(L, i))); } ws_debug_printf("\n"); } /* C-code function equivalent of the typeof() function we created in Lua. * The Lua one is for Lua scripts to use, this one is for C-code to use. */ const gchar* wslua_typeof_unknown = "UNKNOWN"; const gchar* wslua_typeof(lua_State *L, int idx) { const gchar *classname = wslua_typeof_unknown; /* we'll try getting the class name for error reporting*/ if (luaL_getmetafield(L, idx, WSLUA_TYPEOF_FIELD)) { classname = luaL_optstring(L, -1, wslua_typeof_unknown); lua_pop(L,1); /* pop __typeof result */ } else if (lua_type(L,idx) == LUA_TTABLE) { lua_rawgetfield(L, idx, WSLUA_TYPEOF_FIELD); classname = luaL_optstring(L, -1, wslua_typeof_unknown); lua_pop(L,1); /* pop __typeof result */ } return classname; } /* this gets a Lua table of the given name, from the table at the given * location idx. If it does not get a table, it pops whatever it got * and returns false. */ gboolean wslua_get_table(lua_State *L, int idx, const gchar *name) { gboolean result = TRUE; lua_rawgetfield(L, idx, name); if (!lua_istable(L,-1)) { lua_pop(L,1); result = FALSE; } return result; } /* this gets a table field of the given name, from the table at the given * location idx. If it does not get a field, it pops whatever it got * and returns false. */ gboolean wslua_get_field(lua_State *L, int idx, const gchar *name) { gboolean result = TRUE; lua_rawgetfield(L, idx, name); if (lua_isnil(L,-1)) { lua_pop(L,1); result = FALSE; } return result; } /** * This is a transition function that sets attributes on classes. It must be * replaced by setting the attributes in the wslua_class structure such that * WSLUA_REGISTER_ATTRIBUTES can be nuked. */ int wslua_reg_attributes(lua_State *L, const wslua_attribute_table *t, gboolean is_getter) { const gchar *metafield = is_getter ? "__index" : "__newindex"; /* assume __index/__newindex exists and index 1 is a metatable */ lua_rawgetfield(L, -1, metafield); if (lua_isnil(L, -1)) { g_error("%s expected in metatable, found none!\n", metafield); } lua_pop(L, 1); /* Find table to add properties. */ metafield = is_getter ? "__getters" : "__setters"; lua_rawgetfield(L, -1, metafield); if (!lua_istable(L, -1)) { g_error("Property %s is not found in metatable!\n", metafield); } /* Fill the getter/setter table with given functions. Being a transition * function that will be removed later, this does not perform duplicate * keys detection. */ for (; t->fieldname != NULL; t++) { lua_CFunction cfunc = is_getter ? t->getfunc : t->setfunc; if (cfunc) { lua_pushcfunction(L, cfunc); lua_rawsetfield(L, -2, t->fieldname); } } /* Drop __getters/__setters table */ lua_pop(L, 1); return 0; } /** * The __index metamethod for classes. Expected upvalues: class name. */ static int wslua_classmeta_index(lua_State *L) { const char *fieldname = luaL_checkstring(L, 2); const char *classname = luaL_checkstring(L, lua_upvalueindex(1)); return luaL_error(L, "No such '%s' function/property for object type '%s'", fieldname, classname); } /** * The __index/__newindex metamethod for class instances. Expected upvalues: * class name, getters/getters, __index/__newindex class instance metamethod, * class methods (getters only). See wslua_register_classinstance_meta. * * It first tries to find an attribute getter/setter, then an instance method * (getters only), then the __index/__newindex metamethod of the class instance * metatable and finally it gives up with an error. * * Getters are invoked with the table as parameter. Setters are invoked with the * table and the value as parameter. */ static int wslua_instancemeta_index_impl(lua_State *L, gboolean is_getter) { const char *fieldname = luaL_checkstring(L, 2); const int attr_idx = lua_upvalueindex(2); const int fallback_idx = lua_upvalueindex(3); const int methods_idx = lua_upvalueindex(4); /* Check for getter/setter */ if (lua_istable(L, attr_idx)) { lua_rawgetfield(L, attr_idx, fieldname); if (lua_iscfunction(L, -1)) { lua_CFunction cfunc = lua_tocfunction(L, -1); lua_pop(L, 1); /* Remove cfunction from stack */ lua_remove(L, 2); /* Remove key from stack */ /* * Note: this re-uses the current closure as optimization, exposing * its upvalues via pseudo-indices. The alternative is to create a * new C closure (via lua_call), but this is more expensive. * Callees should not rely on the availability of the upvalues. */ return (*cfunc)(L); } } /* If this is a getter, and the getter has methods, try them. */ if (is_getter && lua_istable(L, methods_idx)) { lua_rawgetfield(L, methods_idx, fieldname); if (!lua_isnil(L, -1)) { /* Return method from methods table. */ return 1; } lua_pop(L, 1); /* Remove nil from stack. */ } /* Use function from the class instance metatable (if any). */ if (lua_iscfunction(L, fallback_idx)) { lua_CFunction cfunc = lua_tocfunction(L, fallback_idx); /* Note, unlike getters/setters functions, the key must be preserved! */ return (*cfunc)(L); } const char *classname = luaL_checkstring(L, lua_upvalueindex(1)); return luaL_error(L, "No such '%s' method/field for object type '%s'", fieldname, classname); } static int wslua_instancemeta_index(lua_State *L) { return wslua_instancemeta_index_impl(L, TRUE); } static int wslua_instancemeta_newindex(lua_State *L) { return wslua_instancemeta_index_impl(L, FALSE); } /* Pushes a hex string of the binary data argument. */ int wslua_bin2hex(lua_State* L, const guint8* data, const guint len, const gboolean lowercase, const gchar* sep) { luaL_Buffer b; guint i = 0; static const char byte_to_str_upper[256][3] = { "00","01","02","03","04","05","06","07","08","09","0A","0B","0C","0D","0E","0F", "10","11","12","13","14","15","16","17","18","19","1A","1B","1C","1D","1E","1F", "20","21","22","23","24","25","26","27","28","29","2A","2B","2C","2D","2E","2F", "30","31","32","33","34","35","36","37","38","39","3A","3B","3C","3D","3E","3F", "40","41","42","43","44","45","46","47","48","49","4A","4B","4C","4D","4E","4F", "50","51","52","53","54","55","56","57","58","59","5A","5B","5C","5D","5E","5F", "60","61","62","63","64","65","66","67","68","69","6A","6B","6C","6D","6E","6F", "70","71","72","73","74","75","76","77","78","79","7A","7B","7C","7D","7E","7F", "80","81","82","83","84","85","86","87","88","89","8A","8B","8C","8D","8E","8F", "90","91","92","93","94","95","96","97","98","99","9A","9B","9C","9D","9E","9F", "A0","A1","A2","A3","A4","A5","A6","A7","A8","A9","AA","AB","AC","AD","AE","AF", "B0","B1","B2","B3","B4","B5","B6","B7","B8","B9","BA","BB","BC","BD","BE","BF", "C0","C1","C2","C3","C4","C5","C6","C7","C8","C9","CA","CB","CC","CD","CE","CF", "D0","D1","D2","D3","D4","D5","D6","D7","D8","D9","DA","DB","DC","DD","DE","DF", "E0","E1","E2","E3","E4","E5","E6","E7","E8","E9","EA","EB","EC","ED","EE","EF", "F0","F1","F2","F3","F4","F5","F6","F7","F8","F9","FA","FB","FC","FD","FE","FF" }; static const char byte_to_str_lower[256][3] = { "00","01","02","03","04","05","06","07","08","09","0a","0b","0c","0d","0e","0f", "10","11","12","13","14","15","16","17","18","19","1a","1b","1c","1d","1e","1f", "20","21","22","23","24","25","26","27","28","29","2a","2b","2c","2d","2e","2f", "30","31","32","33","34","35","36","37","38","39","3a","3b","3c","3d","3e","3f", "40","41","42","43","44","45","46","47","48","49","4a","4b","4c","4d","4e","4f", "50","51","52","53","54","55","56","57","58","59","5a","5b","5c","5d","5e","5f", "60","61","62","63","64","65","66","67","68","69","6a","6b","6c","6d","6e","6f", "70","71","72","73","74","75","76","77","78","79","7a","7b","7c","7d","7e","7f", "80","81","82","83","84","85","86","87","88","89","8a","8b","8c","8d","8e","8f", "90","91","92","93","94","95","96","97","98","99","9a","9b","9c","9d","9e","9f", "a0","a1","a2","a3","a4","a5","a6","a7","a8","a9","aa","ab","ac","ad","ae","af", "b0","b1","b2","b3","b4","b5","b6","b7","b8","b9","ba","bb","bc","bd","be","bf", "c0","c1","c2","c3","c4","c5","c6","c7","c8","c9","ca","cb","cc","cd","ce","cf", "d0","d1","d2","d3","d4","d5","d6","d7","d8","d9","da","db","dc","dd","de","df", "e0","e1","e2","e3","e4","e5","e6","e7","e8","e9","ea","eb","ec","ed","ee","ef", "f0","f1","f2","f3","f4","f5","f6","f7","f8","f9","fa","fb","fc","fd","fe","ff" }; const char (*byte_to_str)[3] = byte_to_str_upper; const guint last = len - 1; if (lowercase) byte_to_str = byte_to_str_lower; luaL_buffinit(L, &b); for (i = 0; i < len; i++) { luaL_addlstring(&b, &(*byte_to_str[data[i]]), 2); if (sep && i < last) luaL_addstring(&b, sep); } luaL_pushresult(&b); return 1; } /* Pushes a binary string of the hex-ascii data argument. */ int wslua_hex2bin(lua_State* L, const char* data, const guint len, const gchar* sep) { luaL_Buffer b; guint i = 0; guint seplen = 0; gint8 c, d; static const gint8 str_to_nibble[256] = { -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,-1,-1,-1,-1,-1,-1, -1,10,11,12,13,14,15,-1,-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, -1,10,11,12,13,14,15,-1,-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1 }; if (sep) seplen = (guint) strlen(sep); luaL_buffinit(L, &b); for (i = 0; i < len;) { c = str_to_nibble[(guchar)data[i]]; if (c < 0) { if (seplen && strncmp(&data[i], sep, seplen) == 0) { i += seplen; continue; } else { break; } } d = str_to_nibble[(guchar)data[++i]]; if (d < 0) break; luaL_addchar(&b, (c * 16) + d); i++; } luaL_pushresult(&b); return 1; } /** * Creates a table of getters/setters and pushes it on the Lua stack. * * Additionally, a sanity check is performed to detect colliding getters/setters * and method names. */ static void wslua_push_attributes(lua_State *L, const wslua_attribute_table *t, gboolean is_getter, int methods_idx) { if (!t) { /* No property accessors? Nothing to do. */ //lua_pushnil(L); lua_newtable(L); /* wslua_reg_attributes requires a table for the moment. */ return; } /* If there is a methods table, prepare for a collission check. */ if (lua_istable(L, methods_idx)) { methods_idx = lua_absindex(L, methods_idx); } else { methods_idx = 0; } lua_newtable(L); /* Fill the getter/setter table with given functions. */ for (; t->fieldname != NULL; t++) { lua_CFunction cfunc = is_getter ? t->getfunc : t->setfunc; if (cfunc) { /* if there's a previous methods table, make sure this attribute name doesn't collide */ if (methods_idx) { lua_rawgetfield(L, methods_idx, t->fieldname); if (!lua_isnil(L, -1)) { g_error("'%s' attribute name already exists as method name for class\n", t->fieldname); } lua_pop(L,1); /* pop the nil */ } lua_pushcfunction(L, cfunc); lua_rawsetfield(L, -2, t->fieldname); } } } /** * Registers the metatable for class instances. See the documentation of * wslua_register_class for the exact metatable. */ void wslua_register_classinstance_meta(lua_State *L, const wslua_class *cls_def) { /* Register metatable for use by class instances. STACK = { MT } */ /* NOTE: the name can be changed as long as luaL_checkudata is also adapted */ luaL_newmetatable(L, cls_def->name); if (cls_def->instance_meta) { wslua_setfuncs(L, cls_def->instance_meta, 0); } /* Set the __typeof attribute to the class name (for use by "typeof" in Lua code). */ lua_pushstring(L, cls_def->name); lua_rawsetfield(L, -2, WSLUA_TYPEOF_FIELD); /* Create table to store method names. STACK = { MT, methods } */ if (cls_def->instance_methods) { lua_newtable(L); wslua_setfuncs(L, cls_def->instance_methods, 0); } else { lua_pushnil(L); } /* Prepare __index method on metatable. */ lua_pushstring(L, cls_def->name); /* upval 1: class name */ wslua_push_attributes(L, cls_def->attrs, TRUE, -2); /* upval 2: getters table */ #ifdef WSLUA_WITH_INTROSPECTION lua_pushvalue(L, -1); lua_rawsetfield(L, -5, "__getters"); /* set (transition) property on mt, remove later! */ #endif lua_rawgetfield(L, -4, "__index"); /* upval 3: fallback __index method from metatable */ lua_pushvalue(L, -4); /* upval 4: class methods table */ lua_pushcclosure(L, wslua_instancemeta_index, 4); lua_rawsetfield(L, -3, "__index"); /* Prepare __newindex method on metatable. */ lua_pushstring(L, cls_def->name); /* upval 1: class name */ wslua_push_attributes(L, cls_def->attrs, FALSE, -2); /* upval 2: setters table */ #ifdef WSLUA_WITH_INTROSPECTION lua_pushvalue(L, -1); lua_rawsetfield(L, -5, "__setters"); /* set (transition) property on mt, remove later! */ #endif lua_rawgetfield(L, -4, "__newindex"); /* upval 3: fallback __newindex method from metatable */ lua_pushcclosure(L, wslua_instancemeta_newindex, 3); lua_rawsetfield(L, -3, "__newindex"); /* Pop metatable + methods table. STACK = { } */ lua_pop(L, 2); } /** * Registers a new class for use in Lua with the specified properties. The * metatable for the class instance is internally registered with the given * name. * * This functions basically creates a class (type table) with this structure: * * Class = { class_methods } * Class.__typeof = "Class" -- NOTE: might be removed in future * Class.__metatable = { class_meta } * Class.__metatable.__typeof = "Class" -- NOTE: might be removed in future * Class.__metatable.__index = function_that_errors_out * Class.__metatable.__newindex = function_that_errors_out * * It also registers another metatable for class instances (type userdata): * * mt = { instance_meta } * mt.__typeof = "Class" * -- will be passed upvalues (see wslua_instancemeta_index_impl). * mt.__index = function_that_finds_right_property_or_method_getter * mt.__newindex = function_thaon_that_finds_right_property_or_method_setter * * For backwards compatibility, introspection is still possible (this detail * might be removed in the future though, do not rely on this!): * * Class.__metatable.__methods = Class * Class.__metatable.__getters = { __typeof = "getter", getter_attrs } * Class.__metatable.__setters = { __typeof = "setter", setter_attrs } */ void wslua_register_class(lua_State *L, const wslua_class *cls_def) { /* Check for existing global variables/classes with the same name. */ lua_getglobal(L, cls_def->name); if (!lua_isnil (L, -1)) { g_error("Attempt to register class '%s' which already exists in global Lua table\n", cls_def->name); } lua_pop(L, 1); /* Create new table for class. STACK = { table } */ lua_newtable(L); if (cls_def->class_methods) { wslua_setfuncs(L, cls_def->class_methods, 0); } #ifdef WSLUA_WITH_INTROSPECTION /* Set __typeof to the class name, used by wslua_typeof. Might be removed in * the future as the type can already be determined from the metatable. */ lua_pushstring(L, cls_def->name); lua_rawsetfield(L, -2, WSLUA_TYPEOF_FIELD); #endif /* Create new metatable for class. STACK = { table, CLASSMT } */ lua_newtable(L); if (cls_def->class_meta) { /* Set metamethods on metatable for class. */ wslua_setfuncs(L, cls_def->class_meta, 0); } #ifdef WSLUA_WITH_INTROSPECTION /* Set __typeof to the class name. Might be removed in the future, a "class" * is not of the type "(name of class)", instead it is of type "class". * Instances of this class should be of type "(name of class)". */ lua_pushstring(L, cls_def->name); lua_rawsetfield(L, -2, WSLUA_TYPEOF_FIELD); #endif /* For backwards compatibility, error out when a non-existing property is being accessed. */ lua_pushstring(L, cls_def->name); lua_pushcclosure(L, wslua_classmeta_index, 1); lua_rawsetfield(L, -2, "__index"); /* Prevent properties from being set on classes. Previously this was always * forbidden for classes with attributes (such as Listener), this extends * the restriction to all classes. */ lua_pushstring(L, cls_def->name); lua_pushcclosure(L, wslua_classmeta_index, 1); lua_rawsetfield(L, -2, "__newindex"); /* Set metatable on class. STACK = { table } */ lua_setmetatable(L, -2); wslua_register_classinstance_meta(L, cls_def); #ifdef WSLUA_WITH_INTROSPECTION /* XXX remove these? It looks like an internal implementation detail that is * no longer needed but is added here to pass the wslua tests (API check) */ lua_getmetatable(L, -1); /* Stack = { table, CLASSMT } */ luaL_getmetatable(L, cls_def->name); /* Stack = { table, CLASSMT, MT } */ lua_rawgetfield(L, -1, "__getters"); /* __getters from instance MT */ lua_pushstring(L, "getter"); lua_rawsetfield(L, -2, WSLUA_TYPEOF_FIELD); lua_rawsetfield(L, -3, "__getters"); /* Set property on class MT */ lua_rawgetfield(L, -1, "__setters"); /* setters from instance MT */ lua_pushstring(L, "setter"); lua_rawsetfield(L, -2, WSLUA_TYPEOF_FIELD); lua_rawsetfield(L, -3, "__setters"); /* Set property on class MT */ lua_pop(L, 1); /* Stack = { table, CLASSMT } */ lua_pushvalue(L, -2); lua_rawsetfield(L, -2, "__methods"); /* CLASSMT.__methods = Class */ lua_pop(L, 1); /* Stack = { table } */ #endif /* Set the class methods table as global name. STACK = { } */ lua_setglobal(L, cls_def->name); } /* * Editor modelines - http://www.wireshark.org/tools/modelines.html * * Local variables: * c-basic-offset: 4 * tab-width: 8 * indent-tabs-mode: nil * End: * * vi: set shiftwidth=4 tabstop=8 expandtab: * :indentSize=4:tabSize=8:noTabs=true: */