/* * This is an experimental virtual-object server, written for DiscWorld * by Zellski. The frontend to the mudlib consists of the two functions * virtual_{clone, load}() which will return an object, with a 'real' * object as 'program' and 'variable space' but with state of properties * defined in some fashion by the contents of the file virtual-cloned/loaded. * * Drawbacks as yet: * * The actual compilation methods are barely enough even for testing * purposes but that is simple enough to expand. * * The use of explode() for skipping whitespace is pathetically stupid. * * There is no support for comments in the virtual-files in prop-to-fun. * * A quick explanation of masters/clones. * There is no distinction as in LPC, the only one made is for finding * the object pointers from a virtual filename. For this there IS a * virtual_clone and virtual_load that should be used. they produce much * the same objects, except they CAN choose to make a diff - the clone/load * flag is passed along to compilation. This is needed for .c files of course. * Remember though that even a 'master' BO, /foo/bar.x IS a clone in the end, * of some LPC-file. There is no support for using LPC masterobjects. * You can find a virtual 'master' but not a clone, you may only get a list * of clones made of a given file. */ #include "virtual.h" mapping methods; /* * Each entry in virtual_objects is of the form ({ master, clone1, ... }). * Each entry in methods on ({ object, function }). */ #define OB 0 #define FUN 1 #define TYPE 2 nosave mapping cache; void add_method( string suffix, mixed ob, string fun, int type ) { if( !type ) type = CLONE; if( !methods[suffix] ) methods[suffix] = ({ ob, fun, type }); } /* add_method() */ void create() { seteuid(getuid()); methods = ([ ]); add_method("c", "/global/virtual/c_compiler.c", "compile_c", CLONE|LOAD); add_method("C", "/global/virtual/c_compiler.c", "compile_c", CLONE|LOAD); cache = ([ ]); } /* create() */ #define Error(s) write(s); log_file("VO_HANDLER", s); return 0; string get_mod_time(string name) { if( cache[name] ) return cache[name]; if( file_size(name) <= 0 ) cache[name] = ""; else cache[name] = stat(name)[1]; return cache[name]; } /* get_mod_time() */ object create_virtual_object( string name, int clone ) { string *split; mixed *method; object ob; split = explode(name, "."); method = methods[split[sizeof(split) - 1]]; if( method ) { if( clone || ( method[TYPE] & LOAD ) ) { ob = (object)call_other(method[OB], method[FUN], name, clone ); if( !ob ) return 0; ob->add_property("virtual name", name); if( get_mod_time(name) != "") ob->add_property("virtual time", get_mod_time(name)); return ob; } return 0; } Error("Unknown suffix to "+name+" in create_virtual_object().\n"); } /* create_virtual_object() */ void reset() { cache = ([ ]); } /* reset() */