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 "arena.h"
	#include "runtime.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 (js_type(slot) == JS_UNDEF) {
	EventType *events = ANT_GC_MALLOC(sizeof(EventType ));
	*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_GC_MALLOC(sizeof(EventType) + etlen + 1);
	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_GC_MALLOC(sizeof(EventType) + etlen + 1);
	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 (js_type(args[1]) != JS_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 && js_type(args[2]) != JS_UNDEF) {
	jsval_t once_val = js_get(js, args[2], "once");
	if (js_type(once_val) != JS_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 (js_type(args[1]) != JS_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 && js_type(args[2]) != JS_UNDEF) {
	jsval_t once_val = js_get(js, args[2], "once");
	if (js_type(once_val) != JS_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_mktrue();

	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 && js_type(args[1]) != JS_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 (js_type(result) == JS_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_mktrue();
	}

	// 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_mktrue();
	}

	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 && js_type(args[1]) != JS_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 (js_type(result) == JS_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_mktrue();
	}

	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", evt->listeners[j].once ? js_mktrue() : js_mkfalse());

	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 (js_type(args[1]) != JS_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 (js_type(args[1]) != JS_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_mkfalse();
	}

	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 (js_type(result) == JS_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_mktrue();
	}

	// 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));
	}

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