On Tuesday 04 April 2006 21.37, Han-Wen Nienhuys wrote:
> Erik Sandberg wrote:
> > On Tuesday 04 April 2006 20.46, Han-Wen Nienhuys wrote:
> >> Han-Wen Nienhuys wrote:
> >>> I'd start with 4. because they're independent from the rest, and we can
> >>> readily test the rest of those.
> >
> > The reason for my ordering, is that 3 can be used to verify that 4 works.
> >
> > BTW, (1-3) are completely independent of (4), and I have just finished
> > step (1) locally. If you insist on getting (4) done before (1), then
> > that's perfectly OK with me; but is it OK for you to look at my patch for
> > (1) while I do (4)? I guess (1) is the step which requires the longest
> > discussion, so it might be good to start the discussion early.
>
> If you have a working patch, let's see it.
It's just a bunch of new files; all are attached.
Some known issues:
- scm/define-event-classes.scm contains rather unsorted functions which are
related to music streams. Most of them are probably in the wrong place. I
guess simplify-scheme should be in music-functions.scm, but where should I
place car< ?
- The Stream_event class duplicates its 'context property with a context_
member; this was originally intended to give speedups, but it is broken in
this version and requires some modifications to Context in order to work.
I'll probably remove the context_ member altogether in the next revision.
The dispatcher system has been tested with the following code:
#(begin
; event -> disp -> list
(define disp (ly:make-dispatcher))
(define list (ly:make-listener (lambda (ev) (display "received: \"")
(display ev) (display "\"\n"))))
(define ev (ly:make-stream-event '((class . StreamEvent) (id . 2) (foo .
"bar"))))
(ly:add-listener list disp 'StreamEvent)
(ly:broadcast disp ev)
; ev -> disp2 -> disp -> list
(define disp2 (ly:make-dispatcher))
(ly:connect-dispatchers disp disp2)
(ly:broadcast disp2 ev)
)
--
Erik
/*
dispatcher.cc -- implement Dispatcher
source file of the GNU LilyPond music typesetter
(c) 2005-2006 Erik Sandberg <[EMAIL PROTECTED]>
*/
#include "dispatcher.hh"
#include "international.hh"
#include "ly-smobs.icc"
#include "stream-event.hh"
#include "warn.hh"
// ES todo: move to lily-guile.hh
SCM appendable_list ();
void appendable_list_append (SCM l, SCM elt);
IMPLEMENT_SMOBS (Dispatcher);
IMPLEMENT_TYPE_P (Dispatcher, "dispatcher");
IMPLEMENT_DEFAULT_EQUAL_P (Dispatcher);
Dispatcher::~Dispatcher ()
{
}
Dispatcher::Dispatcher ()
{
self_scm_ = SCM_EOL;
listeners_ = SCM_EOL;
dispatchers_ = SCM_EOL;
listen_classes_ = SCM_EOL;
smobify_self ();
//TODO use resizable hash
listeners_ = scm_c_make_hash_table (17);
priority_count_ = 0;
}
SCM
Dispatcher::mark_smob (SCM sm)
{
Dispatcher *me = (Dispatcher *) SCM_CELL_WORD_1 (sm);
scm_gc_mark (me->dispatchers_);
scm_gc_mark (me->listen_classes_);
return me->listeners_;
}
int
Dispatcher::print_smob (SCM s, SCM p, scm_print_state*)
{
Dispatcher *me = (Dispatcher *) SCM_CELL_WORD_1 (s);
scm_puts ("#<Dispatcher ", p);
scm_write (scm_vector_to_list (me->listeners_), p);
scm_puts (">", p);
return 1;
}
/*
Event dispatching:
- Collect a list of listeners for each relevant class
- Send the event to each of these listeners, in increasing priority order.
This is done by keeping a bubble-sorted temporary list of listener lists,
and iteratively send the event to the lowest-priority listener.
- An event is never sent twice to listeners with equal priority.
*/
IMPLEMENT_LISTENER (Dispatcher, dispatch) (Stream_event *ev)
{
SCM class_symbol = ev->get_property ("class");
if (!scm_symbol_p (class_symbol))
{
warning (_f ("Unknown event class %s", ly_symbol2string (class_symbol).c_str ()));
return;
}
SCM class_list = scm_primitive_eval (class_symbol);
bool sent = false;
// TODO: fix this loop.
int num_classes = 0;
for (SCM cl = class_list; cl != SCM_EOL; cl = scm_cdr (cl))
num_classes++;
// Collect all listener lists.
struct { int prio; SCM list; } lists[num_classes+1];
int i = 0;
for (SCM cl = class_list; cl != SCM_EOL; cl = scm_cdr (cl))
{
SCM list = scm_hashq_ref (listeners_, scm_car (cl), SCM_EOL);
if (list == SCM_EOL)
num_classes--;
else
{
// bubblesort.
int prio = scm_to_int (scm_caar (list));
int j;
for (j = i; j > 0 && lists[j-1].prio > prio; j--)
lists[j] = lists[j-1];
lists[j].prio = prio;
lists[j].list = list;
i++;
}
}
lists[num_classes].prio = INT_MAX;
// Never send an event to two listeners with equal priority.
int last_priority = -1;
// Iteratively process all event classes, in increasing priority.
while (num_classes)
{
// Send the event, if we haven't already sent it to this target.
if (lists[0].prio != last_priority)
{
// process the listener
assert (lists[0].prio > last_priority);
last_priority = lists[0].prio;
Listener *l = unsmob_listener (scm_cdar (lists[0].list));
l->listen (ev);
sent = true;
}
// go to the next listener; bubble-sort the class list.
SCM next = scm_cdr (lists[0].list);
if (next == SCM_EOL)
num_classes--;
int prio = (next == SCM_EOL) ? INT_MAX : scm_to_int (scm_caar (next));
for (i = 0; prio > lists[i+1].prio; i++)
lists[i] = lists[i+1];
lists[i].prio = prio;
lists[i].list = next;
}
if (!sent)
warning (_f ("Junking event: %s", ly_symbol2string (class_symbol).c_str ()));
}
void
Dispatcher::add_listener (Listener l, SCM ev_class)
{
internal_add_listener (l, ev_class, ++priority_count_);
}
#if 0
/*
New listeners are appended to the end of the list.
This way, listeners will listen to an event in the order they were added.
*/
inline void
Dispatcher::internal_add_listener (Listener l, SCM ev_class, int priority)
{
SCM list = scm_hashq_ref (listeners_, ev_class, SCM_EOL);
if (list == SCM_EOL)
{
list = appendable_list ();
scm_hashq_set_x (listeners_, ev_class, list);
/* Register with all dispatchers. */
for (SCM disp = dispatchers_; disp != SCM_EOL; disp = scm_cdr (disp))
{
int priority = scm_cdar (disp);
Dispatcher *d = unsmob_dispatcher (scm_caar (disp));
d->internal_add_listener (dispatch (), ev_class, priority);
}
listen_classes_ = scm_cons (ev_class, listen_classes_);
}
appendable_list_append (list, l.smobbed_copy ());
}
#endif
inline void
Dispatcher::internal_add_listener (Listener l, SCM ev_class, int priority)
{
SCM list = scm_hashq_ref (listeners_, ev_class, SCM_EOL);
if (list == SCM_EOL)
{
/* Register with all dispatchers. */
for (SCM disp = dispatchers_; disp != SCM_EOL; disp = scm_cdr (disp))
{
int priority = scm_to_int (scm_cdar (disp));
Dispatcher *d = unsmob_dispatcher (scm_caar (disp));
d->internal_add_listener (dispatch (), ev_class, priority);
}
listen_classes_ = scm_cons (ev_class, listen_classes_);
}
SCM entry = scm_cons (scm_int2num (priority), l.smobbed_copy ());
list = scm_merge_x (list, scm_list_1 (entry), scm_primitive_eval (ly_symbol2scm ("car<")));
scm_hashq_set_x (listeners_, ev_class, list);
}
void
Dispatcher::remove_listener (Listener l, SCM ev_class)
{
SCM list = scm_hashq_ref (listeners_, ev_class, SCM_EOL);
if (list == SCM_EOL)
{
programming_error ("remove_listener called with incorrect class.");
return;
}
// We just remove the listener once.
bool first = true;
SCM dummy = scm_cons (SCM_EOL, list);
SCM e = dummy;
while (scm_cdr (e) != SCM_EOL)
if (*unsmob_listener (scm_cdadr (e)) == l && first)
{
scm_set_cdr_x (e, scm_cddr(e));
first = false;
break;
}
else
e = scm_cdr (e);
list = scm_cdr (dummy);
#if 0 // obsolete appandable-list code
SCM e = list;
while (scm_cdr (e) != SCM_EOL)
if (*unsmob_listener (scm_cadr (e)) == l && first)
{
scm_set_cdr_x (e, scm_cddr(e));
first = false;
}
else
e = scm_cdr (e);
scm_set_car_x (list, e);
#endif
if (first)
warning ("Attempting to remove nonexisting listener.");
else if (list == SCM_EOL)
{
/* Unregister with all dispatchers. */
for (SCM disp = dispatchers_; disp != SCM_EOL; disp = scm_cdr (disp))
{
Dispatcher *d = unsmob_dispatcher (scm_caar (disp));
d->remove_listener (dispatch (), ev_class);
}
listen_classes_ = scm_delq_x (ev_class, listen_classes_);
}
}
/* Register as a listener to another dispatcher. */
void
Dispatcher::register_as_listener (Dispatcher *disp)
{
int priority = ++disp->priority_count_;
// Don't register twice to the same dispatcher.
if (scm_assq (disp->self_scm (), dispatchers_) != SCM_BOOL_F)
{
warning ("Already listening to dispatcher, ignoring request");
return;
}
dispatchers_ = scm_acons (disp->self_scm (), scm_int2num (priority), dispatchers_);
Listener list = dispatch ();
for (SCM cl = listen_classes_; cl != SCM_EOL; cl = scm_cdr (cl))
{
disp->internal_add_listener (list, scm_car (cl), priority);
}
}
/* Unregister as a listener to another dispatcher. */
void
Dispatcher::unregister_as_listener (Dispatcher *disp)
{
#ifndef NDEBUG
// assert (SCM_EOL == scm_hashq_ref (listeners_, ly_symbol2scm ("StreamEvent"), SCM_EOL));
#endif
dispatchers_ = scm_assq_remove_x (dispatchers_, disp->self_scm ());
Listener list = dispatch ();
for (SCM cl = listen_classes_; cl != SCM_EOL; cl = scm_cdr (cl))
{
disp->remove_listener (list, scm_car (cl));
}
}
LY_DEFINE (ly_make_dispatcher, "ly:make-dispatcher",
0, 0, 0, (),
"Returns a newly created dispatcher.")
{
return (new Dispatcher ())->unprotect ();
}
LY_DEFINE (ly_register_dispatcher, "ly:connect-dispatchers",
2, 0, 0, (SCM to, SCM from),
"Makes the dispatcher @var{to} listen to events from @var{from}." )
{
Dispatcher *t = unsmob_dispatcher (to);
Dispatcher *f = unsmob_dispatcher (from);
SCM_ASSERT_TYPE (t, from, SCM_ARG1, __FUNCTION__, "dispatcher");
SCM_ASSERT_TYPE (f, to, SCM_ARG2, __FUNCTION__, "dispatcher");
t->register_as_listener (f);
return SCM_UNDEFINED;
}
LY_DEFINE (ly_add_listener, "ly:add-listener",
2, 0, 1, (SCM list, SCM disp, SCM cl),
"Adds the listener @var{list} to the dispatcher @var{disp}.\n"
" Whenever @var{disp} hears an event of class @var{cl}, it will be forwarded to @var{list}.\n" )
{
Listener *l = unsmob_listener (list);
Dispatcher *d = unsmob_dispatcher (disp);
SCM_ASSERT_TYPE (l, list, SCM_ARG1, __FUNCTION__, "listener");
SCM_ASSERT_TYPE (d, disp, SCM_ARG2, __FUNCTION__, "dispatcher");
for (int arg=SCM_ARG3; cl != SCM_EOL; cl = scm_cdr (cl), arg++)
{
SCM_ASSERT_TYPE (scm_symbol_p (cl), cl, arg, __FUNCTION__, "symbol");
d->add_listener (*l, scm_car (cl));
}
return SCM_UNDEFINED;
}
LY_DEFINE (ly_broadcast, "ly:broadcast",
2, 0, 0, (SCM disp, SCM ev),
"Sends the stream event @var{ev} to the dispatcher\n"
"@var{disp}.")
{
Dispatcher *d = unsmob_dispatcher (disp);
Stream_event *e = unsmob_stream_event (ev);
SCM_ASSERT_TYPE (d, disp, SCM_ARG1, __FUNCTION__, "dispatcher");
SCM_ASSERT_TYPE (e, ev, SCM_ARG2, __FUNCTION__, "stream event");
d->broadcast (e);
return SCM_UNDEFINED;
}
/*
listener-scheme.cc -- Connect listeners to Scheme through Scm_listener
source file of the GNU LilyPond music typesetter
(c) 2005-2006 Erik Sandberg <[EMAIL PROTECTED]>
*/
#include "listener.hh"
#include "ly-smobs.icc"
#include "stream-event.hh"
class Scm_listener
{
public:
Scm_listener (SCM callback);
DECLARE_LISTENER (listener);
protected:
DECLARE_SMOBS (Scm_listener,);
private:
SCM callback_;
};
IMPLEMENT_LISTENER (Scm_listener, listener) (Stream_event *ev)
{
scm_call_1 (callback_, ev->self_scm ());
}
IMPLEMENT_SMOBS (Scm_listener);
IMPLEMENT_DEFAULT_EQUAL_P (Scm_listener);
Scm_listener::Scm_listener (SCM c)
{
callback_ = SCM_EOL;
self_scm_ = SCM_EOL;
smobify_self ();
callback_ = c;
}
SCM
Scm_listener::mark_smob (SCM obj)
{
Scm_listener *me = (Scm_listener *) SCM_CELL_WORD_1 (obj);
return me->callback_;
}
int
Scm_listener::print_smob (SCM obj, SCM p, scm_print_state*)
{
Scm_listener *me = (Scm_listener *) SCM_CELL_WORD_1 (obj);
scm_puts ("#<Scm_listener ", p);
scm_write (me->callback_, p);
scm_puts (">", p);
return 1;
}
Scm_listener::~Scm_listener ()
{
}
LY_DEFINE (ly_make_listener, "ly:make-listener",
1, 0, 0, (SCM callback),
"Creates a stream-event listener. Any time the listener hears\n"
" a @code{stream-event} object, it will call @var{callback}\n"
" with that object. @var{callback} should take exactly one argument." )
{
SCM_ASSERT_TYPE (scm_procedure_p (callback), callback, SCM_ARG1, __FUNCTION__, "procedure");
Scm_listener *l = new Scm_listener (callback);
SCM listener = l->listener ().smobbed_copy ();
l->unprotect ();
return listener;
}
/*
listener.cc -- implement Listener and Listener_target
source file of the GNU LilyPond music typesetter
(c) 2005 Erik Sandberg <[EMAIL PROTECTED]>
*/
#include "listener.hh"
#include "ly-smobs.icc"
#include "warn.hh"
/*
Listener_target::~Listener_target ()
{
}
*/
Listener::Listener (const void *target, listener_vtable *type)
{
target_ = (void *)target;
type_ = type;
}
Listener::Listener (Listener const &other)
{
target_ = other.target_;
type_ = other.type_;
}
void Listener::listen (Stream_event *ev) const {
(type_->listen_callback) (target_, ev);
}
SCM
Listener::mark_smob (SCM sm)
{
Listener *me = (Listener *) SCM_CELL_WORD_1 (sm);
(me->type_->mark_callback) (me->target_);
return SCM_EOL;
}
int
Listener::print_smob (SCM s, SCM p, scm_print_state*)
{
scm_puts ("#<Listener>", p);
return 1;
}
SCM
Listener::equal_p (SCM a, SCM b)
{
Listener *l1 = unsmob_listener (a);
Listener *l2 = unsmob_listener (b);
return (*l1 == *l2) ? SCM_BOOL_T : SCM_BOOL_F;
}
IMPLEMENT_SIMPLE_SMOBS (Listener);
IMPLEMENT_TYPE_P (Listener, "listener");
/*
stream-event.cc -- implement Stream_event
source file of the GNU LilyPond music typesetter
(c) 2005-2006 Erik Sandberg <[EMAIL PROTECTED]>
*/
#include "stream-event.hh"
#include "ly-smobs.icc"
#include "context.hh"
#include "input.hh"
#include "input-smob.hh"
// ES todo: Add stuff to lily-proto.hh: Stream_event and its subclasses, Stream_creator, etc.
Stream_event::~Stream_event ()
{
}
void
Stream_event::init ()
{
self_scm_ = SCM_EOL;
context_ = -1;
property_alist_ = SCM_EOL;
origin_ = 0;
smobify_self ();
}
Stream_event::Stream_event ()
{
init ();
}
Stream_event::Stream_event (Context *c, Input *origin)
{
init ();
//TODO: re-implement context_ = c->get_unique ();
set_property ("context", scm_int2num (context_));
origin_ = origin;
}
Stream_event::Stream_event (SCM property_alist)
{
init ();
property_alist_ = property_alist;
origin_ = &dummy_input_global;
}
Stream_event::Stream_event (Context *c, SCM class_name)
{
init ();
//TODO:re-implement context_ = c->get_unique ();
set_property ("context", scm_int2num (context_));
set_property ("class", class_name);
origin_ = &dummy_input_global;
}
Stream_event::Stream_event (Stream_event *ev)
{
init ();
property_alist_ = scm_copy_tree (ev->property_alist_);
origin_ = ev->origin_;
context_ = ev->context_;
}
Input *
Stream_event::origin () const
{
return origin_;
}
SCM
Stream_event::mark_smob (SCM sm)
{
Stream_event *me = (Stream_event *) SCM_CELL_WORD_1 (sm);
return me->property_alist_;
}
int
Stream_event::print_smob (SCM s, SCM port, scm_print_state *)
{
scm_puts ("#<Stream_event ", port);
scm_write (dump (s), port);
scm_puts (" >", port);
return 1;
}
IMPLEMENT_SMOBS (Stream_event);
IMPLEMENT_DEFAULT_EQUAL_P (Stream_event);
IMPLEMENT_TYPE_P (Stream_event, "ly:stream-event?");
MAKE_SCHEME_CALLBACK (Stream_event, undump, 1);
MAKE_SCHEME_CALLBACK (Stream_event, dump, 1);
SCM
Stream_event::dump (SCM self)
{
Stream_event *ev = unsmob_stream_event (self);
// Reversed alists look prettier.
return scm_reverse (ev->property_alist_);
}
SCM
Stream_event::undump (SCM data)
{
Stream_event *obj = new Stream_event ();
obj->property_alist_ = scm_reverse (data);
obj->context_ = scm_to_int (obj->get_property ("context"));
return obj->unprotect ();
}
SCM
Stream_event::internal_get_property (SCM sym) const
{
SCM s = scm_sloppy_assq (sym, property_alist_);
if (s != SCM_BOOL_F)
return scm_cdr (s);
return SCM_EOL;
}
void
Stream_event::internal_set_property (SCM prop, SCM val)
{
property_alist_ = scm_assq_set_x (property_alist_, prop, val);
}
/* ------------------------------------ */
LY_DEFINE (ly_make_stream_event, "ly:make-stream-event",
1, 0, 0, (SCM proplist),
"Creates a stream event, with the given property list.\n" )
{
SCM_ASSERT_TYPE (scm_list_p (proplist), proplist, SCM_ARG1, __FUNCTION__, "association list");
Stream_event *e = new Stream_event (proplist);
return e->unprotect ();
}
LY_DEFINE (ly_stream_event_context, "ly:stream-event-context",
1, 0, 0, (SCM sev),
"Returns the context number of the given stream event.")
{
Stream_event *e = unsmob_stream_event (sev);
SCM_ASSERT_TYPE (e, sev, SCM_ARG1, __FUNCTION__, "stream event");
return scm_int2num (e->get_context ());
}
LY_DEFINE (ly_stream_event_property, "ly:stream-event-property",
2, 0, 0, (SCM sev, SCM sym),
"Get the property @var{sym} of stream event @var{mus}.\n"
"If @var{sym} is undefined, return @code{' ()}.\n")
{
Stream_event *e = unsmob_stream_event (sev);
SCM_ASSERT_TYPE (e, sev, SCM_ARG1, __FUNCTION__, "stream event");
SCM_ASSERT_TYPE (scm_is_symbol (sym), sym, SCM_ARG2, __FUNCTION__, "symbol");
return e->internal_get_property (sym);
}
/*
dispatcher.hh -- declare Dispatcher
source file of the GNU LilyPond music typesetter
(c) 2005 Erik Sandberg <[EMAIL PROTECTED]>
*/
#ifndef DISPATCHER_HH
#define DISPATCHER_HH
#include "listener.hh"
#include "stream-event.hh"
class Dispatcher
{
/* Hash table. Each event-class maps to a list of listeners. */
SCM listeners_;
/* alist of dispatchers that we listen to. Each entry is a
(dist . priority) pair. */
SCM dispatchers_;
SCM listen_classes_;
DECLARE_LISTENER (dispatch);
/* priority counter. Listeners with low priority receive events
first. */
int priority_count_;
void internal_add_listener (Listener, SCM event_class, int priority);
public:
Dispatcher ();
void broadcast (Stream_event *ev) { dispatch_proc (ev); }
void add_listener (Listener, SCM event_class);
void remove_listener (Listener, SCM event_class);
void register_as_listener (Dispatcher *dist);
void unregister_as_listener (Dispatcher *dist);
protected:
DECLARE_SMOBS (Dispatcher,);
};
DECLARE_UNSMOB (Dispatcher, dispatcher);
#endif // DISPATCHER_HH
/*
listener.hh -- declare Listener
source file of the GNU LilyPond music typesetter
(c) 2005 Erik Sandberg <[EMAIL PROTECTED]>
*/
#ifndef LISTENER_HH
#define LISTENER_HH
/*
Listeners
Listeners are used for stream event dispatching. If you want to
register a method as an event handler in a dispatcher, then you
must:
- declare the method using DECLARE_LISTENER:
class Foo
{
DECLARE_LISTENER (method);
...
};
- implement the method using IMPLEMENT_LISTENER:
IMPLEMENT_LISTENER (Foo, method) (Stream_event *e)
{
write ("Foo hears an event!");
}
- register the method to the dispatcher using Dispatcher::register
Foo *foo = (...);
Stream_distributor *d = (...);
Listener l = foo->method ();
d->register_listener (l, "EventClass");
Whenever d hears a stream-event ev of class "EventClass",
the implemented procedure is called.
DECLARE_LISTENER currently only works inside smob classes.
*/
#include "smobs.hh"
/*TODO: to lily-proto*/
class Stream_event;
typedef struct {
void (*listen_callback) (void *, Stream_event *);
void (*mark_callback) (void *);
} listener_vtable;
class Listener {
void *target_;
listener_vtable *type_;
public:
Listener (const void *target, listener_vtable *type);
Listener (Listener const &other);
void listen (Stream_event *ev) const;
bool operator == (Listener const &other) const
{ return target_ == other.target_ && type_ == other.type_; }
DECLARE_SIMPLE_SMOBS (Listener,);
};
DECLARE_UNSMOB (Listener, listener);
#define IMPLEMENT_LISTENER(cl, method) \
void \
cl :: method ## _callback (void *self, Stream_event *ev) \
{ \
cl *s = (cl *)self; \
s->method ## _proc (ev); \
} \
void \
cl :: method ## _mark (void *self) \
{ \
cl *s = (cl *)self; \
scm_gc_mark (s->self_scm ()); \
} \
Listener \
cl :: method () const \
{ \
static listener_vtable callbacks; \
callbacks.listen_callback = &cl::method ## _callback; \
callbacks.mark_callback = &cl::method ## _mark; \
return Listener (this, &callbacks); \
} \
void \
cl :: method ## _proc
#define DECLARE_LISTENER(name) \
inline void name ## _proc (Stream_event *); \
static void name ## _callback (void *self, Stream_event *ev); \
static void name ## _mark (void *self); \
Listener name () const
#endif /* LISTENER_HH */
/*
stream-event.hh -- declare Stream_event
source file of the GNU LilyPond music typesetter
(c) 2005-2006 Erik Sandberg <[EMAIL PROTECTED]>
*/
#ifndef STREAM_EVENT_HH
#define STREAM_EVENT_HH
#include "lily-proto.hh"
#include "smobs.hh"
#include "prob.hh"
class Stream_event
{
void init ();
int context_;
SCM property_alist_;
Input *origin_;
public:
Stream_event ();
Input *origin () const;
int get_context () {return context_; }
DECLARE_SCHEME_CALLBACK (undump, (SCM));
DECLARE_SCHEME_CALLBACK (dump, (SCM));
// todo: make Input mandatory.
Stream_event (SCM property_alist);
Stream_event (Context *c, SCM class_name);
Stream_event (Context *c, Input *);
Stream_event (Stream_event *ev);
SCM internal_get_property (SCM) const;
void internal_set_property (SCM prop, SCM val);
protected:
DECLARE_SMOBS (Stream_event,);
};
DECLARE_UNSMOB (Stream_event, stream_event);
DECLARE_TYPE_P (Stream_event);
#define SEND_EVENT_TO_CONTEXT(ctx, cl, ...) \
{ \
Stream_event *_e_ = new Stream_event (ctx, ly_symbol2scm (cl)); \
__VA_ARGS__; \
ctx->event_source ()->distribute (_e_); \
scm_gc_unprotect_object (_e_->self_scm ()); \
}
#define EVENT_PROPERTY(prop, val) \
(_e_->set_property (prop, val))
#endif /* STREAM_EVENT_HH */
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