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ant/src/modules/events.c
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events.c
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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include <uthash.h>
#include "ant.h"
#include "errors.h"
#include "arena.h"
#include "runtime.h"
#include "internal.h"
#include "modules/events.h"
#include "modules/symbol.h"
#define MAX_LISTENERS_PER_EVENT 32
typedef struct {
jsval_t listener;
bool once;
} __attribute__((packed)) EventListener;
typedef struct {
EventListener listeners[MAX_LISTENERS_PER_EVENT];
char *event_type;
UT_hash_handle hh;
int listener_count;
} EventType;
static EventType *global_events = NULL;
static inline void remove_listener_at(EventType *evt, int i) {
int remaining = evt->listener_count - i - 1;
if (remaining > 0) {
memmove(&evt->listeners[i], &evt->listeners[i + 1], remaining * sizeof(EventListener));
}
evt->listener_count--;
}
static EventType **get_or_create_emitter_events(struct js *js, jsval_t this_obj) {
jsval_t slot = js_get_slot(js, this_obj, SLOT_DATA);
if (vtype(slot) == T_UNDEF) {
EventType **events = ant_calloc(sizeof(EventType *));
if (!events) return NULL;
*events = NULL;
js_set_slot(js, this_obj, SLOT_DATA, ANT_PTR(events));
return events;
}
return (EventType **)(uintptr_t)js_getnum(slot);
}
static EventType *find_emitter_event_type(struct js *js, jsval_t this_obj, const char *event_type) {
EventType **events = get_or_create_emitter_events(js, this_obj);
if (events == NULL) return NULL;
EventType *evt = NULL;
HASH_FIND_STR(*events, event_type, evt);
return evt;
}
static EventType *find_or_create_emitter_event_type(struct js *js, jsval_t this_obj, const char *event_type) {
EventType **events = get_or_create_emitter_events(js, this_obj);
if (events == NULL) return NULL;
EventType *evt = NULL;
HASH_FIND_STR(*events, event_type, evt);
if (evt == NULL) {
size_t etlen = strlen(event_type);
evt = ant_calloc(sizeof(EventType) + etlen + 1);
if (!evt) return NULL;
evt->event_type = (char *)(evt + 1);
memcpy(evt->event_type, event_type, etlen + 1);
evt->listener_count = 0;
HASH_ADD_KEYPTR(hh, *events, evt->event_type, etlen, evt);
}
return evt;
}
static EventType *find_or_create_global_event_type(const char *event_type) {
EventType *evt = NULL;
HASH_FIND_STR(global_events, event_type, evt);
if (evt == NULL) {
size_t etlen = strlen(event_type);
evt = ant_calloc(sizeof(EventType) + etlen + 1);
if (!evt) return NULL;
evt->event_type = (char *)(evt + 1);
memcpy(evt->event_type, event_type, etlen + 1);
evt->listener_count = 0;
HASH_ADD_KEYPTR(hh, global_events, evt->event_type, etlen, evt);
}
return evt;
}
static inline EventType *find_global_event_type(const char *event_type) {
EventType *evt = NULL;
HASH_FIND_STR(global_events, event_type, evt);
return evt;
}
// addEventListener(eventType, listener, options)
static jsval_t js_add_event_listener_method(struct js *js, jsval_t *args, int nargs) {
jsval_t this_obj = js_getthis(js);
if (nargs < 2) {
return js_mkerr(js, "addEventListener requires at least 2 arguments (eventType, listener)");
}
char *event_type = js_getstr(js, args[0], NULL);
if (event_type == NULL) return js_mkerr(js, "eventType must be a string");
if (vtype(args[1]) != T_FUNC) return js_mkerr(js, "listener must be a function");
EventType *evt = find_or_create_emitter_event_type(js, this_obj, event_type);
if (evt == NULL) return js_mkerr(js, "failed to create event type");
if (evt->listener_count >= MAX_LISTENERS_PER_EVENT) {
return js_mkerr(js, "maximum number of listeners for event type '%s' reached", event_type);
}
bool once = false;
if (nargs >= 3 && vtype(args[2]) != T_UNDEF) {
jsval_t once_val = js_get(js, args[2], "once");
if (vtype(once_val) != T_UNDEF) once = js_truthy(js, once_val);
}
EventListener *listener = &evt->listeners[evt->listener_count++];
listener->listener = args[1];
listener->once = once;
return js_mkundef();
}
// addEventListener(eventType, listener, options)
static jsval_t js_add_event_listener(struct js *js, jsval_t *args, int nargs) {
if (nargs < 2) {
return js_mkerr(js, "addEventListener requires at least 2 arguments (eventType, listener)");
}
char *event_type = js_getstr(js, args[0], NULL);
if (event_type == NULL) {
return js_mkerr(js, "eventType must be a string");
}
if (vtype(args[1]) != T_FUNC) {
return js_mkerr(js, "listener must be a function");
}
EventType *evt = find_or_create_global_event_type(event_type);
if (evt == NULL) {
return js_mkerr(js, "failed to create event type");
}
if (evt->listener_count >= MAX_LISTENERS_PER_EVENT) {
return js_mkerr(js, "maximum number of listeners for event type '%s' reached", event_type);
}
bool once = false;
if (nargs >= 3 && vtype(args[2]) != T_UNDEF) {
jsval_t once_val = js_get(js, args[2], "once");
if (vtype(once_val) != T_UNDEF) once = js_truthy(js, once_val);
}
EventListener *listener = &evt->listeners[evt->listener_count++];
listener->listener = args[1];
listener->once = once;
return js_mkundef();
}
// removeEventListener(eventType, listener)
static jsval_t js_remove_event_listener_method(struct js *js, jsval_t *args, int nargs) {
jsval_t this_obj = js_getthis(js);
if (nargs < 2) {
return js_mkerr(js, "removeEventListener requires 2 arguments (eventType, listener)");
}
char *event_type = js_getstr(js, args[0], NULL);
if (event_type == NULL) return js_mkerr(js, "eventType must be a string");
EventType *evt = find_emitter_event_type(js, this_obj, event_type);
if (evt == NULL) return js_mkundef();
for (int i = 0; i < evt->listener_count; i++) {
if (evt->listeners[i].listener == args[1]) {
remove_listener_at(evt, i); break;
}
}
return js_mkundef();
}
// removeEventListener(eventType, listener)
static jsval_t js_remove_event_listener(struct js *js, jsval_t *args, int nargs) {
if (nargs < 2) {
return js_mkerr(js, "removeEventListener requires 2 arguments (eventType, listener)");
}
char *event_type = js_getstr(js, args[0], NULL);
if (event_type == NULL) return js_mkerr(js, "eventType must be a string");
EventType *evt = find_global_event_type(event_type);
if (evt == NULL) return js_mkundef();
for (int i = 0; i < evt->listener_count; i++) {
if (evt->listeners[i].listener == args[1]) {
remove_listener_at(evt, i); break;
}
}
return js_mkundef();
}
// dispatchEvent(eventType, eventData)
static jsval_t js_dispatch_event_method(struct js *js, jsval_t *args, int nargs) {
jsval_t this_obj = js_getthis(js);
if (nargs < 1) {
return js_mkerr(js, "dispatchEvent requires at least 1 argument (eventType)");
}
char *event_type = js_getstr(js, args[0], NULL);
if (event_type == NULL) return js_mkerr(js, "eventType must be a string");
EventType *evt = find_emitter_event_type(js, this_obj, event_type);
if (evt == NULL || evt->listener_count == 0) return js_true;
jsval_t event_obj = js_mkobj(js);
js_set(js, event_obj, "type", args[0]);
js_set(js, event_obj, "target", this_obj);
js_set(js, event_obj, get_toStringTag_sym_key(), js_mkstr(js, "Event", 5));
if (nargs >= 2 && vtype(args[1]) != T_UNDEF) {
js_set(js, event_obj, "detail", args[1]);
}
jsval_t listener_args[1] = {event_obj};
int i = 0;
while (i < evt->listener_count) {
EventListener *listener = &evt->listeners[i];
jsval_t result = js_call(js, listener->listener, listener_args, 1);
if (vtype(result) == T_ERR) {
fprintf(stderr, "Error in event listener for '%s': %s\n", event_type, js_str(js, result));
}
if (listener->once) {
remove_listener_at(evt, i);
} else i++;
}
return js_true;
}
// dispatchEvent(eventType, eventData)
static jsval_t js_dispatch_event(struct js *js, jsval_t *args, int nargs) {
if (nargs < 1) {
return js_mkerr(js, "dispatchEvent requires at least 1 argument (eventType)");
}
char *event_type = js_getstr(js, args[0], NULL);
if (event_type == NULL) return js_mkerr(js, "eventType must be a string");
EventType *evt = find_global_event_type(event_type);
if (evt == NULL || evt->listener_count == 0) {
return js_true;
}
jsval_t event_obj = js_mkobj(js);
js_set(js, event_obj, "type", args[0]);
js_set(js, event_obj, get_toStringTag_sym_key(), js_mkstr(js, "Event", 5));
if (nargs >= 2 && vtype(args[1]) != T_UNDEF) {
js_set(js, event_obj, "detail", args[1]);
}
jsval_t listener_args[1] = {event_obj};
int i = 0;
while (i < evt->listener_count) {
EventListener *listener = &evt->listeners[i];
jsval_t result = js_call(js, listener->listener, listener_args, 1);
if (vtype(result) == T_ERR) {
fprintf(stderr, "Error in event listener for '%s': %s\n", event_type, js_str(js, result));
}
if (listener->once) {
remove_listener_at(evt, i);
} else i++;
}
return js_true;
}
static jsval_t js_get_event_listeners(struct js *js, jsval_t *args, int nargs) {
(void)args; (void)nargs;
EventType *evt, *tmp;
jsval_t result = js_mkobj(js);
HASH_ITER(hh, global_events, evt, tmp) {
jsval_t listeners_array = js_mkobj(js);
for (int j = 0; j < evt->listener_count; j++) {
char key[16];
snprintf(key, sizeof(key), "%d", j);
jsval_t listener_info = js_mkobj(js);
js_set(js, listener_info, "listener", evt->listeners[j].listener);
js_set(js, listener_info, "once", js_bool(evt->listeners[j].once));
js_set(js, listeners_array, key, listener_info);
}
js_set(js, listeners_array, "length", js_mknum(evt->listener_count));
js_set(js, result, evt->event_type, listeners_array);
}
return result;
}
// EventEmitter.prototype.on(event, listener)
static jsval_t js_eventemitter_on(struct js *js, jsval_t *args, int nargs) {
jsval_t this_obj = js_getthis(js);
if (nargs < 2) {
return js_mkerr(js, "on requires 2 arguments (event, listener)");
}
char *event_type = js_getstr(js, args[0], NULL);
if (event_type == NULL) {
return js_mkerr(js, "event must be a string");
}
if (vtype(args[1]) != T_FUNC) {
return js_mkerr(js, "listener must be a function");
}
EventType *evt = find_or_create_emitter_event_type(js, this_obj, event_type);
if (evt == NULL) {
return js_mkerr(js, "failed to create event type");
}
if (evt->listener_count >= MAX_LISTENERS_PER_EVENT) {
return js_mkerr(js, "maximum number of listeners for event '%s' reached", event_type);
}
EventListener *listener = &evt->listeners[evt->listener_count++];
listener->listener = args[1];
listener->once = false;
return this_obj;
}
// EventEmitter.prototype.once(event, listener)
static jsval_t js_eventemitter_once(struct js *js, jsval_t *args, int nargs) {
jsval_t this_obj = js_getthis(js);
if (nargs < 2) {
return js_mkerr(js, "once requires 2 arguments (event, listener)");
}
char *event_type = js_getstr(js, args[0], NULL);
if (event_type == NULL) {
return js_mkerr(js, "event must be a string");
}
if (vtype(args[1]) != T_FUNC) {
return js_mkerr(js, "listener must be a function");
}
EventType *evt = find_or_create_emitter_event_type(js, this_obj, event_type);
if (evt == NULL) {
return js_mkerr(js, "failed to create event type");
}
if (evt->listener_count >= MAX_LISTENERS_PER_EVENT) {
return js_mkerr(js, "maximum number of listeners for event '%s' reached", event_type);
}
EventListener *listener = &evt->listeners[evt->listener_count++];
listener->listener = args[1];
listener->once = true;
return this_obj;
}
// EventEmitter.prototype.off(event, listener)
static jsval_t js_eventemitter_off(struct js *js, jsval_t *args, int nargs) {
jsval_t this_obj = js_getthis(js);
if (nargs < 2) {
return js_mkerr(js, "off requires 2 arguments (event, listener)");
}
char *event_type = js_getstr(js, args[0], NULL);
if (event_type == NULL) {
return js_mkerr(js, "event must be a string");
}
EventType *evt = find_emitter_event_type(js, this_obj, event_type);
if (evt == NULL) {
return this_obj;
}
for (int i = 0; i < evt->listener_count; i++) {
if (evt->listeners[i].listener == args[1]) {
remove_listener_at(evt, i); break;
}
}
return this_obj;
}
// EventEmitter.prototype.emit(event, ...args)
static jsval_t js_eventemitter_emit(struct js *js, jsval_t *args, int nargs) {
jsval_t this_obj = js_getthis(js);
if (nargs < 1) {
return js_mkerr(js, "emit requires at least 1 argument (event)");
}
char *event_type = js_getstr(js, args[0], NULL);
if (event_type == NULL) {
return js_mkerr(js, "event must be a string");
}
EventType *evt = find_emitter_event_type(js, this_obj, event_type);
if (evt == NULL || evt->listener_count == 0) {
return js_false;
}
int listener_nargs = nargs - 1;
jsval_t *listener_args = (listener_nargs > 0) ? &args[1] : NULL;
int i = 0;
while (i < evt->listener_count) {
EventListener *listener = &evt->listeners[i];
jsval_t result = js_call(js, listener->listener, listener_args, listener_nargs);
if (vtype(result) == T_ERR) {
fprintf(stderr, "Error in event listener for '%s': %s\n", event_type, js_str(js, result));
}
if (listener->once) {
remove_listener_at(evt, i);
} else i++;
}
return js_true;
}
// EventEmitter.prototype.removeAllListeners(event)
static jsval_t js_eventemitter_removeAllListeners(struct js *js, jsval_t *args, int nargs) {
jsval_t this_obj = js_getthis(js);
if (nargs < 1) {
return this_obj;
}
char *event_type = js_getstr(js, args[0], NULL);
if (event_type == NULL) {
return this_obj;
}
EventType *evt = find_emitter_event_type(js, this_obj, event_type);
if (evt != NULL) {
evt->listener_count = 0;
}
return this_obj;
}
// EventEmitter.prototype.listenerCount(event)
static jsval_t js_eventemitter_listenerCount(struct js *js, jsval_t *args, int nargs) {
jsval_t this_obj = js_getthis(js);
if (nargs < 1) {
return js_mknum(0);
}
char *event_type = js_getstr(js, args[0], NULL);
if (event_type == NULL) {
return js_mknum(0);
}
EventType *evt = find_emitter_event_type(js, this_obj, event_type);
if (evt == NULL) {
return js_mknum(0);
}
return js_mknum(evt->listener_count);
}
// EventEmitter.prototype.eventNames()
static jsval_t js_eventemitter_eventNames(struct js *js, jsval_t *args, int nargs) {
(void)args; (void)nargs;
jsval_t this_obj = js_getthis(js);
jsval_t result = js_mkarr(js);
EventType **events = get_or_create_emitter_events(js, this_obj);
if (events != NULL && *events != NULL) {
EventType *evt, *tmp;
HASH_ITER(hh, *events, evt, tmp) {
if (evt->listener_count > 0) {
jsval_t name = js_mkstr(js, evt->event_type, strlen(evt->event_type));
js_arr_push(js, result, name);
}
}
}
return result;
}
// EventEmitter constructor
static jsval_t js_eventemitter_constructor(struct js *js, jsval_t *args, int nargs) {
(void)args; (void)nargs;
jsval_t proto = js_get_ctor_proto(js, "EventEmitter", 12);
jsval_t obj = js_mkobj(js);
js_set_proto(js, obj, proto);
return obj;
}
static jsval_t js_eventtarget_constructor(struct js *js, jsval_t *args, int nargs) {
(void)args; (void)nargs;
jsval_t proto = js_get_ctor_proto(js, "EventTarget", 11);
jsval_t obj = js_mkobj(js);
js_set_proto(js, obj, proto);
return obj;
}
jsval_t events_library(struct js *js) {
jsval_t lib = js_mkobj(js);
jsval_t eventemitter_ctor = js_mkobj(js);
jsval_t eventemitter_proto = js_mkobj(js);
js_set(js, eventemitter_proto, "on", js_mkfun(js_eventemitter_on));
js_set(js, eventemitter_proto, "addListener", js_mkfun(js_eventemitter_on));
js_set(js, eventemitter_proto, "once", js_mkfun(js_eventemitter_once));
js_set(js, eventemitter_proto, "off", js_mkfun(js_eventemitter_off));
js_set(js, eventemitter_proto, "removeListener", js_mkfun(js_eventemitter_off));
js_set(js, eventemitter_proto, "emit", js_mkfun(js_eventemitter_emit));
js_set(js, eventemitter_proto, "removeAllListeners", js_mkfun(js_eventemitter_removeAllListeners));
js_set(js, eventemitter_proto, "listenerCount", js_mkfun(js_eventemitter_listenerCount));
js_set(js, eventemitter_proto, "eventNames", js_mkfun(js_eventemitter_eventNames));
js_set(js, eventemitter_proto, get_toStringTag_sym_key(), js_mkstr(js, "EventEmitter", 12));
js_set_slot(js, eventemitter_ctor, SLOT_CFUNC, js_mkfun(js_eventemitter_constructor));
js_mkprop_fast(js, eventemitter_ctor, "prototype", 9, eventemitter_proto);
js_mkprop_fast(js, eventemitter_ctor, "name", 4, ANT_STRING("EventEmitter"));
js_set_descriptor(js, eventemitter_ctor, "name", 4, 0);
js_set(js, lib, "EventEmitter", js_obj_to_func(eventemitter_ctor));
js_set(js, lib, get_toStringTag_sym_key(), js_mkstr(js, "events", 6));
return lib;
}
void init_events_module() {
struct js *js = rt->js;
jsval_t global = js_glob(js);
jsval_t eventtarget_ctor = js_mkobj(js);
jsval_t eventtarget_proto = js_mkobj(js);
js_set(js, eventtarget_proto, "addEventListener", js_mkfun(js_add_event_listener_method));
js_set(js, eventtarget_proto, "removeEventListener", js_mkfun(js_remove_event_listener_method));
js_set(js, eventtarget_proto, "dispatchEvent", js_mkfun(js_dispatch_event_method));
js_set(js, eventtarget_proto, get_toStringTag_sym_key(), js_mkstr(js, "EventTarget", 11));
js_set_slot(js, eventtarget_ctor, SLOT_CFUNC, js_mkfun(js_eventtarget_constructor));
js_mkprop_fast(js, eventtarget_ctor, "prototype", 9, eventtarget_proto);
js_mkprop_fast(js, eventtarget_ctor, "name", 4, ANT_STRING("EventTarget"));
js_set_descriptor(js, eventtarget_ctor, "name", 4, 0);
js_set(js, global, "addEventListener", js_mkfun(js_add_event_listener));
js_set(js, global, "removeEventListener", js_mkfun(js_remove_event_listener));
js_set(js, global, "dispatchEvent", js_mkfun(js_dispatch_event));
js_set(js, global, "getEventListeners", js_mkfun(js_get_event_listeners));
js_set(js, global, "EventTarget", js_obj_to_func(eventtarget_ctor));
}
void events_gc_update_roots(void (*op_val)(void *, jsval_t *), void *ctx) {
EventType *evt, *tmp;
HASH_ITER(hh, global_events, evt, tmp) {
for (int i = 0; i < evt->listener_count; i++) op_val(ctx, &evt->listeners[i].listener);
}
}

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