/*
* 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() */
