/* ** $Id: lbaselib.c,v 1.191.1.6 2008/02/14 16:46:22 roberto Exp $ ** Basic library ** See Copyright Notice in lua.h */ using System; using System.Collections.Generic; using System.Text; namespace KopiLua { using lua_Number = System.Double; public partial class Lua { /* ** If your system does not support `stdout', you can just remove this function. ** If you need, you can define your own `print' function, following this ** model but changing `fputs' to put the strings at a proper place ** (a console window or a log file, for instance). */ private static int luaB_print (lua_State L) { int n = lua_gettop(L); /* number of arguments */ int i; lua_getglobal(L, "tostring"); for (i=1; i<=n; i++) { CharPtr s; lua_pushvalue(L, -1); /* function to be called */ lua_pushvalue(L, i); /* value to print */ lua_call(L, 1, 1); s = lua_tostring(L, -1); /* get result */ if (s == null) return luaL_error(L, LUA_QL("tostring") + " must return a string to " + LUA_QL("print")); if (i > 1) fputs("\t", stdout); fputs(s, stdout); lua_pop(L, 1); /* pop result */ } Console.Write("\n", stdout); return 0; } private static int luaB_tonumber (lua_State L) { int base_ = luaL_optint(L, 2, 10); if (base_ == 10) { /* standard conversion */ luaL_checkany(L, 1); if (lua_isnumber(L, 1) != 0) { lua_pushnumber(L, lua_tonumber(L, 1)); return 1; } } else { CharPtr s1 = luaL_checkstring(L, 1); CharPtr s2; ulong n; luaL_argcheck(L, 2 <= base_ && base_ <= 36, 2, "base out of range"); n = strtoul(s1, out s2, base_); if (s1 != s2) { /* at least one valid digit? */ while (isspace((byte)(s2[0]))) s2 = s2.next(); /* skip trailing spaces */ if (s2[0] == '\0') { /* no invalid trailing characters? */ lua_pushnumber(L, (lua_Number)n); return 1; } } } lua_pushnil(L); /* else not a number */ return 1; } private static int luaB_error (lua_State L) { int level = luaL_optint(L, 2, 1); lua_settop(L, 1); if ((lua_isstring(L, 1)!=0) && (level > 0)) { /* add extra information? */ luaL_where(L, level); lua_pushvalue(L, 1); lua_concat(L, 2); } return lua_error(L); } private static int luaB_getmetatable (lua_State L) { luaL_checkany(L, 1); if (lua_getmetatable(L, 1)==0) { lua_pushnil(L); return 1; /* no metatable */ } luaL_getmetafield(L, 1, "__metatable"); return 1; /* returns either __metatable field (if present) or metatable */ } private static int luaB_setmetatable (lua_State L) { int t = lua_type(L, 2); luaL_checktype(L, 1, LUA_TTABLE); luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2, "nil or table expected"); if (luaL_getmetafield(L, 1, "__metatable") != 0) luaL_error(L, "cannot change a protected metatable"); lua_settop(L, 2); lua_setmetatable(L, 1); return 1; } private static void getfunc (lua_State L, int opt) { if (lua_isfunction(L, 1)) lua_pushvalue(L, 1); else { lua_Debug ar = new lua_Debug(); int level = (opt != 0) ? luaL_optint(L, 1, 1) : luaL_checkint(L, 1); luaL_argcheck(L, level >= 0, 1, "level must be non-negative"); if (lua_getstack(L, level, ar) == 0) luaL_argerror(L, 1, "invalid level"); lua_getinfo(L, "f", ar); if (lua_isnil(L, -1)) luaL_error(L, "no function environment for tail call at level %d", level); } } private static int luaB_getfenv (lua_State L) { getfunc(L, 1); if (lua_iscfunction(L, -1)) /* is a C function? */ lua_pushvalue(L, LUA_GLOBALSINDEX); /* return the thread's global env. */ else lua_getfenv(L, -1); return 1; } private static int luaB_setfenv (lua_State L) { luaL_checktype(L, 2, LUA_TTABLE); getfunc(L, 0); lua_pushvalue(L, 2); if ((lua_isnumber(L, 1)!=0) && (lua_tonumber(L, 1) == 0)) { /* change environment of current thread */ lua_pushthread(L); lua_insert(L, -2); lua_setfenv(L, -2); return 0; } else if (lua_iscfunction(L, -2) || lua_setfenv(L, -2) == 0) luaL_error(L, LUA_QL("setfenv") + " cannot change environment of given object"); return 1; } private static int luaB_rawequal (lua_State L) { luaL_checkany(L, 1); luaL_checkany(L, 2); lua_pushboolean(L, lua_rawequal(L, 1, 2)); return 1; } private static int luaB_rawget (lua_State L) { luaL_checktype(L, 1, LUA_TTABLE); luaL_checkany(L, 2); lua_settop(L, 2); lua_rawget(L, 1); return 1; } private static int luaB_rawset (lua_State L) { luaL_checktype(L, 1, LUA_TTABLE); luaL_checkany(L, 2); luaL_checkany(L, 3); lua_settop(L, 3); lua_rawset(L, 1); return 1; } private static int luaB_gcinfo (lua_State L) { lua_pushinteger(L, lua_getgccount(L)); return 1; } public static readonly CharPtr[] opts = {"stop", "restart", "collect", "count", "step", "setpause", "setstepmul", null}; public readonly static int[] optsnum = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT, LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETPAUSE, LUA_GCSETSTEPMUL}; private static int luaB_collectgarbage (lua_State L) { int o = luaL_checkoption(L, 1, "collect", opts); int ex = luaL_optint(L, 2, 0); int res = lua_gc(L, optsnum[o], ex); switch (optsnum[o]) { case LUA_GCCOUNT: { int b = lua_gc(L, LUA_GCCOUNTB, 0); lua_pushnumber(L, res + ((lua_Number)b/1024)); return 1; } case LUA_GCSTEP: { lua_pushboolean(L, res); return 1; } default: { lua_pushnumber(L, res); return 1; } } } private static int luaB_type (lua_State L) { luaL_checkany(L, 1); lua_pushstring(L, luaL_typename(L, 1)); return 1; } private static int luaB_next (lua_State L) { luaL_checktype(L, 1, LUA_TTABLE); lua_settop(L, 2); /* create a 2nd argument if there isn't one */ if (lua_next(L, 1) != 0) return 2; else { lua_pushnil(L); return 1; } } private static int luaB_pairs (lua_State L) { luaL_checktype(L, 1, LUA_TTABLE); lua_pushvalue(L, lua_upvalueindex(1)); /* return generator, */ lua_pushvalue(L, 1); /* state, */ lua_pushnil(L); /* and initial value */ return 3; } private static int ipairsaux (lua_State L) { int i = luaL_checkint(L, 2); luaL_checktype(L, 1, LUA_TTABLE); i++; /* next value */ lua_pushinteger(L, i); lua_rawgeti(L, 1, i); return (lua_isnil(L, -1)) ? 0 : 2; } private static int luaB_ipairs (lua_State L) { luaL_checktype(L, 1, LUA_TTABLE); lua_pushvalue(L, lua_upvalueindex(1)); /* return generator, */ lua_pushvalue(L, 1); /* state, */ lua_pushinteger(L, 0); /* and initial value */ return 3; } private static int load_aux (lua_State L, int status) { if (status == 0) /* OK? */ return 1; else { lua_pushnil(L); lua_insert(L, -2); /* put before error message */ return 2; /* return nil plus error message */ } } private static int luaB_loadstring (lua_State L) { uint l; CharPtr s = luaL_checklstring(L, 1, out l); CharPtr chunkname = luaL_optstring(L, 2, s); return load_aux(L, luaL_loadbuffer(L, s, l, chunkname)); } private static int luaB_loadfile (lua_State L) { CharPtr fname = luaL_optstring(L, 1, null); return load_aux(L, luaL_loadfile(L, fname)); } /* ** Reader for generic `load' function: `lua_load' uses the ** stack for internal stuff, so the reader cannot change the ** stack top. Instead, it keeps its resulting string in a ** reserved slot inside the stack. */ private static CharPtr generic_reader (lua_State L, object ud, out uint size) { //(void)ud; /* to avoid warnings */ luaL_checkstack(L, 2, "too many nested functions"); lua_pushvalue(L, 1); /* get function */ lua_call(L, 0, 1); /* call it */ if (lua_isnil(L, -1)) { size = 0; return null; } else if (lua_isstring(L, -1) != 0) { lua_replace(L, 3); /* save string in a reserved stack slot */ return lua_tolstring(L, 3, out size); } else { size = 0; luaL_error(L, "reader function must return a string"); } return null; /* to avoid warnings */ } private static int luaB_load (lua_State L) { int status; CharPtr cname = luaL_optstring(L, 2, "=(load)"); luaL_checktype(L, 1, LUA_TFUNCTION); lua_settop(L, 3); /* function, eventual name, plus one reserved slot */ status = lua_load(L, generic_reader, null, cname); return load_aux(L, status); } private static int luaB_dofile (lua_State L) { CharPtr fname = luaL_optstring(L, 1, null); int n = lua_gettop(L); if (luaL_loadfile(L, fname) != 0) lua_error(L); lua_call(L, 0, LUA_MULTRET); return lua_gettop(L) - n; } private static int luaB_assert (lua_State L) { luaL_checkany(L, 1); if (lua_toboolean(L, 1)==0) return luaL_error(L, "%s", luaL_optstring(L, 2, "assertion failed!")); return lua_gettop(L); } private static int luaB_unpack (lua_State L) { int i, e, n; luaL_checktype(L, 1, LUA_TTABLE); i = luaL_optint(L, 2, 1); e = luaL_opt_integer(L, luaL_checkint, 3, luaL_getn(L, 1)); if (i > e) return 0; /* empty range */ n = e - i + 1; /* number of elements */ if (n <= 0 || (lua_checkstack(L, n)==0)) /* n <= 0 means arith. overflow */ return luaL_error(L, "too many results to unpack"); lua_rawgeti(L, 1, i); /* push arg[i] (avoiding overflow problems) */ while (i++ < e) /* push arg[i + 1...e] */ lua_rawgeti(L, 1, i); return n; } private static int luaB_select (lua_State L) { int n = lua_gettop(L); if (lua_type(L, 1) == LUA_TSTRING && lua_tostring(L, 1)[0] == '#') { lua_pushinteger(L, n-1); return 1; } else { int i = luaL_checkint(L, 1); if (i < 0) i = n + i; else if (i > n) i = n; luaL_argcheck(L, 1 <= i, 1, "index out of range"); return n - i; } } private static int luaB_pcall (lua_State L) { int status; luaL_checkany(L, 1); status = lua_pcall(L, lua_gettop(L) - 1, LUA_MULTRET, 0); lua_pushboolean(L, (status == 0) ? 1 : 0); lua_insert(L, 1); return lua_gettop(L); /* return status + all results */ } private static int luaB_xpcall (lua_State L) { int status; luaL_checkany(L, 2); lua_settop(L, 2); lua_insert(L, 1); /* put error function under function to be called */ status = lua_pcall(L, 0, LUA_MULTRET, 1); lua_pushboolean(L, (status == 0) ? 1 : 0); lua_replace(L, 1); return lua_gettop(L); /* return status + all results */ } private static int luaB_tostring (lua_State L) { luaL_checkany(L, 1); if (luaL_callmeta(L, 1, "__tostring") != 0) /* is there a metafield? */ return 1; /* use its value */ switch (lua_type(L, 1)) { case LUA_TNUMBER: lua_pushstring(L, lua_tostring(L, 1)); break; case LUA_TSTRING: lua_pushvalue(L, 1); break; case LUA_TBOOLEAN: lua_pushstring(L, (lua_toboolean(L, 1) != 0 ? "true" : "false")); break; case LUA_TNIL: lua_pushliteral(L, "nil"); break; default: lua_pushfstring(L, "%s: %p", luaL_typename(L, 1), lua_topointer(L, 1)); break; } return 1; } private static int luaB_newproxy (lua_State L) { lua_settop(L, 1); lua_newuserdata(L, 0); /* create proxy */ if (lua_toboolean(L, 1) == 0) return 1; /* no metatable */ else if (lua_isboolean(L, 1)) { lua_newtable(L); /* create a new metatable `m' ... */ lua_pushvalue(L, -1); /* ... and mark `m' as a valid metatable */ lua_pushboolean(L, 1); lua_rawset(L, lua_upvalueindex(1)); /* weaktable[m] = true */ } else { int validproxy = 0; /* to check if weaktable[metatable(u)] == true */ if (lua_getmetatable(L, 1) != 0) { lua_rawget(L, lua_upvalueindex(1)); validproxy = lua_toboolean(L, -1); lua_pop(L, 1); /* remove value */ } luaL_argcheck(L, validproxy!=0, 1, "boolean or proxy expected"); lua_getmetatable(L, 1); /* metatable is valid; get it */ } lua_setmetatable(L, 2); return 1; } private readonly static luaL_Reg[] base_funcs = { new luaL_Reg("assert", luaB_assert), new luaL_Reg("collectgarbage", luaB_collectgarbage), new luaL_Reg("dofile", luaB_dofile), new luaL_Reg("error", luaB_error), new luaL_Reg("gcinfo", luaB_gcinfo), new luaL_Reg("getfenv", luaB_getfenv), new luaL_Reg("getmetatable", luaB_getmetatable), new luaL_Reg("loadfile", luaB_loadfile), new luaL_Reg("load", luaB_load), new luaL_Reg("loadstring", luaB_loadstring), new luaL_Reg("next", luaB_next), new luaL_Reg("pcall", luaB_pcall), new luaL_Reg("print", luaB_print), new luaL_Reg("rawequal", luaB_rawequal), new luaL_Reg("rawget", luaB_rawget), new luaL_Reg("rawset", luaB_rawset), new luaL_Reg("select", luaB_select), new luaL_Reg("setfenv", luaB_setfenv), new luaL_Reg("setmetatable", luaB_setmetatable), new luaL_Reg("tonumber", luaB_tonumber), new luaL_Reg("tostring", luaB_tostring), new luaL_Reg("type", luaB_type), new luaL_Reg("unpack", luaB_unpack), new luaL_Reg("xpcall", luaB_xpcall), new luaL_Reg(null, null) }; /* ** {====================================================== ** Coroutine library ** ======================================================= */ public const int CO_RUN = 0; /* running */ public const int CO_SUS = 1; /* suspended */ public const int CO_NOR = 2; /* 'normal' (it resumed another coroutine) */ public const int CO_DEAD = 3; private static readonly string[] statnames = {"running", "suspended", "normal", "dead"}; private static int costatus (lua_State L, lua_State co) { if (L == co) return CO_RUN; switch (lua_status(co)) { case LUA_YIELD: return CO_SUS; case 0: { lua_Debug ar = new lua_Debug(); if (lua_getstack(co, 0, ar) > 0) /* does it have frames? */ return CO_NOR; /* it is running */ else if (lua_gettop(co) == 0) return CO_DEAD; else return CO_SUS; /* initial state */ } default: /* some error occured */ return CO_DEAD; } } private static int luaB_costatus (lua_State L) { lua_State co = lua_tothread(L, 1); luaL_argcheck(L, co!=null, 1, "coroutine expected"); lua_pushstring(L, statnames[costatus(L, co)]); return 1; } private static int auxresume (lua_State L, lua_State co, int narg) { int status = costatus(L, co); if (lua_checkstack(co, narg)==0) luaL_error(L, "too many arguments to resume"); if (status != CO_SUS) { lua_pushfstring(L, "cannot resume %s coroutine", statnames[status]); return -1; /* error flag */ } lua_xmove(L, co, narg); lua_setlevel(L, co); status = lua_resume(co, narg); if (status == 0 || status == LUA_YIELD) { int nres = lua_gettop(co); if (lua_checkstack(L, nres + 1)==0) luaL_error(L, "too many results to resume"); lua_xmove(co, L, nres); /* move yielded values */ return nres; } else { lua_xmove(co, L, 1); /* move error message */ return -1; /* error flag */ } } private static int luaB_coresume (lua_State L) { lua_State co = lua_tothread(L, 1); int r; luaL_argcheck(L, co!=null, 1, "coroutine expected"); r = auxresume(L, co, lua_gettop(L) - 1); if (r < 0) { lua_pushboolean(L, 0); lua_insert(L, -2); return 2; /* return false + error message */ } else { lua_pushboolean(L, 1); lua_insert(L, -(r + 1)); return r + 1; /* return true + `resume' returns */ } } private static int luaB_auxwrap (lua_State L) { lua_State co = lua_tothread(L, lua_upvalueindex(1)); int r = auxresume(L, co, lua_gettop(L)); if (r < 0) { if (lua_isstring(L, -1) != 0) { /* error object is a string? */ luaL_where(L, 1); /* add extra info */ lua_insert(L, -2); lua_concat(L, 2); } lua_error(L); /* propagate error */ } return r; } private static int luaB_cocreate (lua_State L) { lua_State NL = lua_newthread(L); luaL_argcheck(L, lua_isfunction(L, 1) && !lua_iscfunction(L, 1), 1, "Lua function expected"); lua_pushvalue(L, 1); /* move function to top */ lua_xmove(L, NL, 1); /* move function from L to NL */ return 1; } private static int luaB_cowrap (lua_State L) { luaB_cocreate(L); lua_pushcclosure(L, luaB_auxwrap, 1); return 1; } private static int luaB_yield (lua_State L) { return lua_yield(L, lua_gettop(L)); } private static int luaB_corunning (lua_State L) { if (lua_pushthread(L) != 0) lua_pushnil(L); /* main thread is not a coroutine */ return 1; } private readonly static luaL_Reg[] co_funcs = { new luaL_Reg("create", luaB_cocreate), new luaL_Reg("resume", luaB_coresume), new luaL_Reg("running", luaB_corunning), new luaL_Reg("status", luaB_costatus), new luaL_Reg("wrap", luaB_cowrap), new luaL_Reg("yield", luaB_yield), new luaL_Reg(null, null) }; /* }====================================================== */ private static void auxopen (lua_State L, CharPtr name, lua_CFunction f, lua_CFunction u) { lua_pushcfunction(L, u); lua_pushcclosure(L, f, 1); lua_setfield(L, -2, name); } private static void base_open (lua_State L) { /* set global _G */ lua_pushvalue(L, LUA_GLOBALSINDEX); lua_setglobal(L, "_G"); /* open lib into global table */ luaL_register(L, "_G", base_funcs); lua_pushliteral(L, LUA_VERSION); lua_setglobal(L, "_VERSION"); /* set global _VERSION */ /* `ipairs' and `pairs' need auxliliary functions as upvalues */ auxopen(L, "ipairs", luaB_ipairs, ipairsaux); auxopen(L, "pairs", luaB_pairs, luaB_next); /* `newproxy' needs a weaktable as upvalue */ lua_createtable(L, 0, 1); /* new table `w' */ lua_pushvalue(L, -1); /* `w' will be its own metatable */ lua_setmetatable(L, -2); lua_pushliteral(L, "kv"); lua_setfield(L, -2, "__mode"); /* metatable(w).__mode = "kv" */ lua_pushcclosure(L, luaB_newproxy, 1); lua_setglobal(L, "newproxy"); /* set global `newproxy' */ } public static int luaopen_base (lua_State L) { base_open(L); luaL_register(L, LUA_COLIBNAME, co_funcs); return 2; } } }