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 <time.h>
	#include <uthash.h>
	#include <utarray.h>

	#include "ant.h"
	#include "errors.h"
	#include "runtime.h"
	#include "internal.h"
	#include "descriptors.h"
	#include "silver/engine.h"

	#include "gc/modules.h"
	#include "modules/abort.h"
	#include "modules/events.h"
	#include "modules/symbol.h"

	typedef struct {
	bool canceled;
	bool stop_immediate;
	bool stop_propagation;
	bool dispatching;
	} event_data_t;

	static ant_value_t g_isTrusted_getter = 0;
	static ant_value_t g_event_proto = 0;
	static ant_value_t g_customevent_proto = 0;
	static ant_value_t g_errorevent_proto = 0;
	static ant_value_t g_promiserejectionevent_proto = 0;

	static event_data_t *get_event_data(ant_value_t obj) {
	ant_value_t slot = js_get_slot(obj, SLOT_DATA);
	if (vtype(slot) != T_NUM) return NULL;
	return (event_data_t *)(uintptr_t)js_getnum(slot);
	}

	static double get_timestamp_ms(void) {
	struct timespec ts;
	clock_gettime(CLOCK_MONOTONIC, &ts);
	return (double)ts.tv_sec * 1e3 + (double)ts.tv_nsec / 1e6;
	}

	typedef struct {
	ant_value_t callback;
	ant_value_t signal;
	bool once;
	bool capture;
	} EventListenerEntry;

	static const UT_icd event_listener_icd = {
	sizeof(EventListenerEntry),
	NULL, NULL, NULL
	};

	typedef struct {
	UT_array *listeners;
	char *event_type;
	UT_hash_handle hh;
	} EventType;

	typedef struct emitter_reg {
	EventType **events;
	struct emitter_reg *next;
	} emitter_reg_t;

	static EventType *global_events = NULL;
	static emitter_reg_t *emitter_registry = NULL;

	static EventType make_event_type(const char event_type) {
	size_t etlen = strlen(event_type);
	EventType *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);
	utarray_new(evt->listeners, &event_listener_icd);
	return evt;
	}

	static EventType *get_or_create_emitter_events(ant_t js, ant_value_t this_obj) {
	ant_value_t slot = js_get_slot(this_obj, SLOT_DATA);
	if (vtype(slot) == T_UNDEF) {
	EventType *events = ant_calloc(sizeof(EventType ));
	if (!events) return NULL;
	*events = NULL;

	emitter_reg_t *reg = ant_calloc(sizeof(emitter_reg_t));
	if (!reg) { free(events); return NULL; }
	reg->events = events;
	reg->next = emitter_registry;
	emitter_registry = reg;

	js_set_slot(this_obj, SLOT_DATA, ANT_PTR(events));
	return events;
	}
	return (EventType **)(uintptr_t)js_getnum(slot);
	}

	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) {
	evt = make_event_type(event_type);
	if (!evt) return NULL;
	HASH_ADD_KEYPTR(hh, global_events, evt->event_type, strlen(evt->event_type), evt);
	}
	return evt;
	}

	static EventType find_global_event_type(const char event_type) {
	EventType *evt = NULL;
	HASH_FIND_STR(global_events, event_type, evt);
	return evt;
	}

	static EventType find_or_create_emitter_event_type(ant_t js, ant_value_t this_obj, const char *event_type) {
	EventType **events = get_or_create_emitter_events(js, this_obj);
	if (!events) return NULL;
	EventType *evt = NULL;
	HASH_FIND_STR(*events, event_type, evt);
	if (!evt) {
	evt = make_event_type(event_type);
	if (!evt) return NULL;
	HASH_ADD_KEYPTR(hh, *events, evt->event_type, strlen(evt->event_type), evt);
	}
	return evt;
	}

	static EventType find_emitter_event_type(ant_t js, ant_value_t this_obj, const char *event_type) {
	EventType **events = get_or_create_emitter_events(js, this_obj);
	if (!events) return NULL;
	EventType *evt = NULL;
	HASH_FIND_STR(*events, event_type, evt);
	return evt;
	}

	static void js_init_event_obj(ant_t *js, ant_value_t obj, ant_value_t type_val, bool bubbles, bool cancelable) {
	js_set(js, obj, "type", type_val);
	js_set(js, obj, "target", js_mknull());
	js_set(js, obj, "srcElement", js_mknull());
	js_set(js, obj, "currentTarget", js_mknull());
	js_set(js, obj, "eventPhase", js_mknum(0));
	js_set(js, obj, "bubbles", js_bool(bubbles));
	js_set(js, obj, "cancelable", js_bool(cancelable));
	js_set(js, obj, "defaultPrevented", js_false);
	js_set(js, obj, "returnValue", js_true);
	js_set(js, obj, "cancelBubble", js_false);
	js_set(js, obj, "timeStamp", js_mknum(get_timestamp_ms()));

	if (g_isTrusted_getter)
	js_set_accessor_desc(js, obj, "isTrusted", 9, g_isTrusted_getter, js_mkundef(), 0);

	event_data_t *data = ant_calloc(sizeof(event_data_t));
	if (data) js_set_slot(obj, SLOT_DATA, ANT_PTR(data));
	}

	static ant_value_t js_event_ctor(ant_t js, ant_value_t args, int nargs) {
	if (vtype(js->new_target) == T_UNDEF)
	return js_mkerr_typed(js, JS_ERR_TYPE, "Event constructor requires 'new'");
	if (nargs < 1 \|\| vtype(args[0]) == T_UNDEF)
	return js_mkerr_typed(js, JS_ERR_TYPE, "Event constructor: type argument is required");

	ant_value_t type_val = args[0];
	if (vtype(type_val) != T_STR) {
	type_val = js_tostring_val(js, type_val);
	if (is_err(type_val)) return type_val;
	}

	bool bubbles = false, cancelable = false;
	if (nargs >= 2 && vtype(args[1]) == T_OBJ) {
	ant_value_t b = js_get(js, args[1], "bubbles");
	ant_value_t c = js_get(js, args[1], "cancelable");
	if (is_err(b)) return b;
	if (is_err(c)) return c;
	bubbles = js_truthy(js, b);
	cancelable = js_truthy(js, c);
	}

	ant_value_t this_obj = js_mkobj(js);
	ant_value_t proto = js_instance_proto_from_new_target(js, g_event_proto);
	if (is_object_type(proto)) js_set_proto_init(this_obj, proto);

	js_init_event_obj(js, this_obj, type_val, bubbles, cancelable);
	return this_obj;
	}

	static ant_value_t js_event_get_isTrusted(ant_t js, ant_value_t args, int nargs) {
	return js_false;
	}

	static ant_value_t js_event_preventDefault(ant_t js, ant_value_t args, int nargs) {
	ant_value_t this_obj = js_getthis(js);
	ant_value_t cancelable = js_get(js, this_obj, "cancelable");
	if (!js_truthy(js, cancelable)) return js_mkundef();
	event_data_t *data = get_event_data(this_obj);
	if (data) data->canceled = true;
	js_set(js, this_obj, "defaultPrevented", js_true);
	js_set(js, this_obj, "returnValue", js_false);
	return js_mkundef();
	}

	static ant_value_t js_event_stopPropagation(ant_t js, ant_value_t args, int nargs) {
	ant_value_t this_obj = js_getthis(js);
	event_data_t *data = get_event_data(this_obj);
	if (data) data->stop_propagation = true;
	js_set(js, this_obj, "cancelBubble", js_true);
	return js_mkundef();
	}

	static ant_value_t js_event_stopImmediatePropagation(ant_t js, ant_value_t args, int nargs) {
	ant_value_t this_obj = js_getthis(js);
	event_data_t *data = get_event_data(this_obj);
	if (data) { data->stop_immediate = true; data->stop_propagation = true; }
	js_set(js, this_obj, "cancelBubble", js_true);
	return js_mkundef();
	}

	static ant_value_t js_event_composedPath(ant_t js, ant_value_t args, int nargs) {
	ant_value_t this_obj = js_getthis(js);
	event_data_t *data = get_event_data(this_obj);
	ant_value_t result = js_mkarr(js);
	if (data && data->dispatching) {
	ant_value_t ct = js_get(js, this_obj, "currentTarget");
	if (is_object_type(ct)) js_arr_push(js, result, ct);
	}
	return result;
	}

	static ant_value_t js_event_initEvent(ant_t js, ant_value_t args, int nargs) {
	ant_value_t this_obj = js_getthis(js);
	if (nargs >= 1) {
	ant_value_t type_val = vtype(args[0]) == T_STR ? args[0] : js_tostring_val(js, args[0]);
	if (!is_err(type_val)) js_set(js, this_obj, "type", type_val);
	}
	if (nargs >= 2) js_set(js, this_obj, "bubbles", js_bool(js_truthy(js, args[1])));
	if (nargs >= 3) js_set(js, this_obj, "cancelable", js_bool(js_truthy(js, args[2])));
	js_set(js, this_obj, "defaultPrevented", js_false);
	js_set(js, this_obj, "returnValue", js_true);
	event_data_t *data = get_event_data(this_obj);
	if (data) { data->canceled = false; data->stop_immediate = false; data->stop_propagation = false; }
	return js_mkundef();
	}

	static ant_value_t js_customevent_ctor(ant_t js, ant_value_t args, int nargs) {
	if (vtype(js->new_target) == T_UNDEF)
	return js_mkerr_typed(js, JS_ERR_TYPE, "CustomEvent constructor requires 'new'");
	if (nargs < 1 \|\| vtype(args[0]) == T_UNDEF)
	return js_mkerr_typed(js, JS_ERR_TYPE, "CustomEvent constructor: type argument is required");

	ant_value_t type_val = args[0];
	if (vtype(type_val) != T_STR) {
	type_val = js_tostring_val(js, type_val);
	if (is_err(type_val)) return type_val;
	}

	bool bubbles = false, cancelable = false;
	ant_value_t detail = js_mknull();
	if (nargs >= 2 && vtype(args[1]) == T_OBJ) {
	ant_value_t b = js_get(js, args[1], "bubbles");
	ant_value_t c = js_get(js, args[1], "cancelable");
	ant_value_t d = js_get(js, args[1], "detail");
	if (is_err(b)) return b;
	if (is_err(c)) return c;
	bubbles = js_truthy(js, b);
	cancelable = js_truthy(js, c);
	if (vtype(d) != T_UNDEF) detail = d;
	}

	ant_value_t this_obj = js_mkobj(js);
	ant_value_t proto = js_instance_proto_from_new_target(js, g_customevent_proto);
	if (is_object_type(proto)) js_set_proto_init(this_obj, proto);

	js_init_event_obj(js, this_obj, type_val, bubbles, cancelable);
	js_set(js, this_obj, "detail", detail);
	return this_obj;
	}

	static ant_value_t js_errorevent_ctor(ant_t js, ant_value_t args, int nargs) {
	if (vtype(js->new_target) == T_UNDEF)
	return js_mkerr_typed(js, JS_ERR_TYPE, "ErrorEvent constructor requires 'new'");
	if (nargs < 1 \|\| vtype(args[0]) == T_UNDEF)
	return js_mkerr_typed(js, JS_ERR_TYPE, "ErrorEvent constructor: type argument is required");

	ant_value_t type_val = args[0];
	if (vtype(type_val) != T_STR) {
	type_val = js_tostring_val(js, type_val);
	if (is_err(type_val)) return type_val;
	}

	bool bubbles = false, cancelable = false;
	ant_value_t message = js_mkstr(js, "", 0);
	ant_value_t filename = js_mkstr(js, "", 0);
	ant_value_t lineno = js_mknum(0);
	ant_value_t colno = js_mknum(0);
	ant_value_t error = js_mknull();

	if (nargs >= 2 && vtype(args[1]) == T_OBJ) {
	ant_value_t b = js_get(js, args[1], "bubbles");
	ant_value_t c = js_get(js, args[1], "cancelable");
	ant_value_t m = js_get(js, args[1], "message");
	ant_value_t f = js_get(js, args[1], "filename");
	ant_value_t l = js_get(js, args[1], "lineno");
	ant_value_t co = js_get(js, args[1], "colno");
	ant_value_t e = js_get(js, args[1], "error");
	if (is_err(b)) return b;
	if (is_err(c)) return c;
	bubbles = js_truthy(js, b);
	cancelable = js_truthy(js, c);
	if (vtype(m) != T_UNDEF) { message = js_tostring_val(js, m); if (is_err(message)) return message; }
	if (vtype(f) != T_UNDEF) { filename = js_tostring_val(js, f); if (is_err(filename)) return filename; }
	if (vtype(l) != T_UNDEF) lineno = l;
	if (vtype(co) != T_UNDEF) colno = co;
	if (vtype(e) != T_UNDEF) error = e;
	}

	ant_value_t this_obj = js_mkobj(js);
	ant_value_t proto = js_instance_proto_from_new_target(js, g_errorevent_proto);
	if (is_object_type(proto)) js_set_proto_init(this_obj, proto);

	js_init_event_obj(js, this_obj, type_val, bubbles, cancelable);
	js_set(js, this_obj, "message", message);
	js_set(js, this_obj, "filename", filename);
	js_set(js, this_obj, "lineno", lineno);
	js_set(js, this_obj, "colno", colno);
	js_set(js, this_obj, "error", error);
	return this_obj;
	}

	static ant_value_t js_promiserejectionevent_ctor(ant_t js, ant_value_t args, int nargs) {
	if (vtype(js->new_target) == T_UNDEF)
	return js_mkerr_typed(js, JS_ERR_TYPE, "PromiseRejectionEvent constructor requires 'new'");
	if (nargs < 1 \|\| vtype(args[0]) == T_UNDEF)
	return js_mkerr_typed(js, JS_ERR_TYPE, "PromiseRejectionEvent constructor: type argument is required");

	ant_value_t type_val = args[0];
	if (vtype(type_val) != T_STR) {
	type_val = js_tostring_val(js, type_val);
	if (is_err(type_val)) return type_val;
	}

	bool bubbles = false, cancelable = false;
	ant_value_t promise = js_mkundef();
	ant_value_t reason = js_mkundef();

	if (nargs >= 2 && vtype(args[1]) == T_OBJ) {
	ant_value_t b = js_get(js, args[1], "bubbles");
	ant_value_t c = js_get(js, args[1], "cancelable");
	ant_value_t p = js_get(js, args[1], "promise");
	ant_value_t r = js_get(js, args[1], "reason");
	if (is_err(b)) return b;
	if (is_err(c)) return c;
	bubbles = js_truthy(js, b);
	cancelable = js_truthy(js, c);
	if (vtype(p) != T_UNDEF) promise = p;
	if (vtype(r) != T_UNDEF) reason = r;
	}

	ant_value_t this_obj = js_mkobj(js);
	ant_value_t proto = js_instance_proto_from_new_target(js, g_promiserejectionevent_proto);
	if (is_object_type(proto)) js_set_proto_init(this_obj, proto);

	js_init_event_obj(js, this_obj, type_val, bubbles, cancelable);
	js_set(js, this_obj, "promise", promise);
	js_set(js, this_obj, "reason", reason);
	return this_obj;
	}

	static bool parse_addEventListener_options(ant_t js, ant_value_t args, int nargs, bool once, bool capture, ant_value_t *signal) {
	once = false; capture = false; *signal = js_mkundef();
	if (nargs < 3) return true;
	ant_value_t opts = args[2];
	if (vtype(opts) == T_BOOL) {
	*capture = js_truthy(js, opts);
	return true;
	}
	if (vtype(opts) != T_OBJ) return true;

	ant_value_t sig = js_get(js, opts, "signal");
	if (vtype(sig) == T_NULL) return false;
	if (vtype(sig) != T_UNDEF) {
	if (!is_object_type(sig)) return false;
	*signal = sig;
	}

	ant_value_t o = js_get(js, opts, "once");
	ant_value_t ca = js_get(js, opts, "capture");
	if (vtype(o) != T_UNDEF) *once = js_truthy(js, o);
	if (vtype(ca) != T_UNDEF) *capture = js_truthy(js, ca);
	return true;
	}

	static ant_value_t add_listener_to(ant_t js, ant_value_t args, int nargs, EventType *evt) {
	if (!evt) return js_mkerr(js, "failed to create event type");

	bool once, capture;
	ant_value_t signal;
	if (!parse_addEventListener_options(js, args, nargs, &once, &capture, &signal))
	return js_mkerr_typed(js, JS_ERR_TYPE, "Failed to execute 'addEventListener': signal is not an AbortSignal");

	if (vtype(signal) != T_UNDEF && abort_signal_is_aborted(signal)) return js_mkundef();

	ant_value_t cb = args[1];
	uint8_t cbt = vtype(cb);
	if (cbt == T_NULL \|\| cbt == T_UNDEF) return js_mkundef();
	if (cbt != T_FUNC && cbt != T_CFUNC) return js_mkundef();

	for (unsigned int i = 0; i < utarray_len(evt->listeners); i++) {
	EventListenerEntry e = (EventListenerEntry )utarray_eltptr(evt->listeners, i);
	if (e->callback == cb && e->capture == capture) return js_mkundef();
	}

	EventListenerEntry entry = { cb, signal, once, capture };
	utarray_push_back(evt->listeners, &entry);
	return js_mkundef();
	}

	static ant_value_t remove_listener_from(ant_t js, ant_value_t args, int nargs, EventType *evt) {
	if (!evt) return js_mkundef();

	bool capture = false;
	if (nargs >= 3) {
	ant_value_t opts = args[2];
	if (vtype(opts) == T_BOOL) capture = js_truthy(js, opts);
	else if (vtype(opts) == T_OBJ) {
	ant_value_t ca = js_get(js, opts, "capture");
	if (vtype(ca) != T_UNDEF) capture = js_truthy(js, ca);
	}}

	ant_value_t cb = (nargs >= 2) ? args[1] : js_mkundef();
	uint8_t cbt = vtype(cb);
	if (cbt == T_NULL \|\| cbt == T_UNDEF) return js_mkundef();

	for (unsigned int i = 0; i < utarray_len(evt->listeners); i++) {
	EventListenerEntry e = (EventListenerEntry )utarray_eltptr(evt->listeners, i);
	if (e->callback == cb && e->capture == capture) {
	utarray_erase(evt->listeners, i, 1);
	return js_mkundef();
	}
	}
	return js_mkundef();
	}

	static ant_value_t dispatch_event_to(ant_t js, ant_value_t event_obj, EventType evt, ant_value_t target) {
	if (!evt) return js_true;

	event_data_t *data = get_event_data(event_obj);
	if (data) { data->dispatching = true; data->stop_immediate = false; }
	js_set(js, event_obj, "target", target);
	js_set(js, event_obj, "currentTarget", target);
	js_set(js, event_obj, "eventPhase", js_mknum(2));

	ant_value_t call_args[1] = { event_obj };
	unsigned int n = utarray_len(evt->listeners);

	for (unsigned int i = 0; i < n;) {
	EventListenerEntry entry = (EventListenerEntry )utarray_eltptr(evt->listeners, i);

	if (vtype(entry->signal) != T_UNDEF && abort_signal_is_aborted(entry->signal)) {
	utarray_erase(evt->listeners, i, 1);
	n--; continue;
	}

	ant_value_t cb = entry->callback;
	bool once = entry->once;
	if (once) { utarray_erase(evt->listeners, i, 1); n--; } else i++;

	uint8_t t = vtype(cb);
	if (t != T_FUNC && t != T_CFUNC) continue;

	sv_vm_call(js->vm, js, cb, js_mkundef(), call_args, 1, NULL, false);
	if (data && data->stop_immediate) break;
	}

	if (data) data->dispatching = false;
	js_set(js, event_obj, "currentTarget", js_mknull());
	js_set(js, event_obj, "eventPhase", js_mknum(0));

	bool canceled = data && data->canceled;
	return js_bool(!canceled);
	}

	static ant_value_t js_add_event_listener_method(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1) return js_mkundef();
	const char *event_type = js_getstr(js, args[0], NULL);
	if (!event_type) return js_mkundef();
	return add_listener_to(js, args, nargs,
	find_or_create_emitter_event_type(js, js_getthis(js), event_type));
	}

	static ant_value_t js_add_event_listener(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1) return js_mkundef();
	const char *event_type = js_getstr(js, args[0], NULL);
	if (!event_type) return js_mkundef();
	return add_listener_to(js, args, nargs, find_or_create_global_event_type(event_type));
	}

	static ant_value_t js_remove_event_listener_method(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1) return js_mkundef();
	const char *event_type = js_getstr(js, args[0], NULL);
	if (!event_type) return js_mkundef();
	return remove_listener_from(js, args, nargs,
	find_emitter_event_type(js, js_getthis(js), event_type));
	}

	static ant_value_t js_remove_event_listener(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1) return js_mkundef();
	const char *event_type = js_getstr(js, args[0], NULL);
	if (!event_type) return js_mkundef();
	return remove_listener_from(js, args, nargs, find_global_event_type(event_type));
	}

	static ant_value_t js_dispatch_event_method(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1 \|\| !is_object_type(args[0])) return js_false;
	ant_value_t this_obj = js_getthis(js);
	ant_value_t type_val = js_get(js, args[0], "type");
	const char *event_type = js_getstr(js, type_val, NULL);
	if (!event_type) return js_false;
	return dispatch_event_to(js, args[0],
	find_emitter_event_type(js, this_obj, event_type), this_obj);
	}

	static ant_value_t js_dispatch_event(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1 \|\| !is_object_type(args[0])) return js_false;
	ant_value_t type_val = js_get(js, args[0], "type");
	const char *event_type = js_getstr(js, type_val, NULL);
	if (!event_type) return js_false;
	return dispatch_event_to(js, args[0],
	find_global_event_type(event_type), js_glob(js));
	}

	void js_dispatch_global_event(ant_t *js, ant_value_t event_obj) {
	ant_value_t type_val = js_get(js, event_obj, "type");
	const char *event_type = js_getstr(js, type_val, NULL);
	if (!event_type) return;
	EventType *evt = find_global_event_type(event_type);
	if (!evt \|\| utarray_len(evt->listeners) == 0) return;
	dispatch_event_to(js, event_obj, evt, js_glob(js));
	}

	static ant_value_t js_eventemitter_add(ant_t js, ant_value_t args, int nargs, bool once) {
	if (nargs < 2) return js_mkerr(js, "requires 2 arguments (event, listener)");
	const char *event_type = js_getstr(js, args[0], NULL);
	if (!event_type) return js_mkerr(js, "event must be a string");
	uint8_t t = vtype(args[1]);
	if (t != T_FUNC && t != T_CFUNC) return js_mkerr(js, "listener must be a function");

	ant_value_t this_obj = js_getthis(js);
	EventType *evt = find_or_create_emitter_event_type(js, this_obj, event_type);
	if (!evt) return js_mkerr(js, "failed to create event type");

	EventListenerEntry entry = { args[1], js_mkundef(), once, false };
	utarray_push_back(evt->listeners, &entry);
	return this_obj;
	}

	static ant_value_t js_eventemitter_on(ant_t js, ant_value_t args, int nargs) {
	return js_eventemitter_add(js, args, nargs, false);
	}

	static ant_value_t js_eventemitter_once(ant_t js, ant_value_t args, int nargs) {
	return js_eventemitter_add(js, args, nargs, true);
	}

	static ant_value_t js_eventemitter_off(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 2) return js_mkerr(js, "off requires 2 arguments (event, listener)");
	const char *event_type = js_getstr(js, args[0], NULL);
	if (!event_type) return js_mkerr(js, "event must be a string");
	ant_value_t this_obj = js_getthis(js);
	remove_listener_from(js, args, nargs, find_emitter_event_type(js, this_obj, event_type));
	return this_obj;
	}

	static ant_value_t js_eventemitter_emit(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "emit requires at least 1 argument (event)");
	const char *event_type = js_getstr(js, args[0], NULL);
	if (!event_type) return js_mkerr(js, "event must be a string");

	ant_value_t this_obj = js_getthis(js);
	EventType *evt = find_emitter_event_type(js, this_obj, event_type);
	if (!evt \|\| utarray_len(evt->listeners) == 0) return js_false;

	int listener_nargs = nargs - 1;
	ant_value_t *listener_args = listener_nargs > 0 ? &args[1] : NULL;

	for (unsigned int i = 0; i < utarray_len(evt->listeners);) {
	EventListenerEntry entry = (EventListenerEntry )utarray_eltptr(evt->listeners, i);
	ant_value_t cb = entry->callback;
	bool once = entry->once;
	if (once) { utarray_erase(evt->listeners, i, 1); } else i++;
	uint8_t t = vtype(cb);
	if (t != T_FUNC && t != T_CFUNC) continue;
	ant_value_t result = sv_vm_call(js->vm, js, cb, js_mkundef(), listener_args, listener_nargs, NULL, false);
	if (vtype(result) == T_ERR)
	fprintf(stderr, "Error in event listener for '%s': %s\n", event_type, js_str(js, result));
	}
	return js_true;
	}

	static ant_value_t js_eventemitter_removeAllListeners(ant_t js, ant_value_t args, int nargs) {
	ant_value_t this_obj = js_getthis(js);
	if (nargs < 1) return this_obj;
	const char *event_type = js_getstr(js, args[0], NULL);
	if (!event_type) return this_obj;
	EventType *evt = find_emitter_event_type(js, this_obj, event_type);
	if (evt) utarray_clear(evt->listeners);
	return this_obj;
	}

	static ant_value_t js_eventemitter_listenerCount(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1) return js_mknum(0);
	const char *event_type = js_getstr(js, args[0], NULL);
	if (!event_type) return js_mknum(0);
	EventType *evt = find_emitter_event_type(js, js_getthis(js), event_type);
	if (!evt) return js_mknum(0);
	return js_mknum((double)utarray_len(evt->listeners));
	}

	static ant_value_t js_eventemitter_eventNames(ant_t js, ant_value_t args, int nargs) {
	ant_value_t this_obj = js_getthis(js);
	ant_value_t result = js_mkarr(js);
	EventType **events = get_or_create_emitter_events(js, this_obj);
	if (events && *events) {
	EventType evt, tmp;
	HASH_ITER(hh, *events, evt, tmp) {
	if (utarray_len(evt->listeners) > 0)
	js_arr_push(js, result, js_mkstr(js, evt->event_type, strlen(evt->event_type)));
	}
	}
	return result;
	}

	ant_value_t events_library(ant_t *js) {
	ant_value_t lib = js_mkobj(js);
	ant_value_t eventemitter_ctor = js_mkobj(js);
	ant_value_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_sym(js, eventemitter_proto, get_toStringTag_sym(), js_mkstr(js, "EventEmitter", 12));

	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);

	ant_value_t ctor_fn = js_obj_to_func_ex(eventemitter_ctor, SV_CALL_IS_DEFAULT_CTOR);
	js_set(js, lib, "EventEmitter", ctor_fn);
	js_set(js, lib, "default", ctor_fn);
	js_set_sym(js, lib, get_toStringTag_sym(), js_mkstr(js, "events", 6));

	return lib;
	}

	void init_events_module(void) {
	ant_t *js = rt->js;
	ant_value_t global = js_glob(js);
	g_isTrusted_getter = js_mkfun(js_event_get_isTrusted);

	g_event_proto = js_mkobj(js);
	js_set_sym(js, g_event_proto, get_toStringTag_sym(), js_mkstr(js, "Event", 5));
	js_set(js, g_event_proto, "preventDefault", js_mkfun(js_event_preventDefault));
	js_set(js, g_event_proto, "stopPropagation", js_mkfun(js_event_stopPropagation));
	js_set(js, g_event_proto, "stopImmediatePropagation", js_mkfun(js_event_stopImmediatePropagation));
	js_set(js, g_event_proto, "composedPath", js_mkfun(js_event_composedPath));
	js_set(js, g_event_proto, "initEvent", js_mkfun(js_event_initEvent));
	js_set(js, g_event_proto, "NONE", js_mknum(0));
	js_set(js, g_event_proto, "CAPTURING_PHASE", js_mknum(1));
	js_set(js, g_event_proto, "AT_TARGET", js_mknum(2));
	js_set(js, g_event_proto, "BUBBLING_PHASE", js_mknum(3));

	ant_value_t event_fn = js_make_ctor(js, js_event_ctor, g_event_proto, "Event", 5);
	js_set(js, event_fn, "NONE", js_mknum(0));
	js_set(js, event_fn, "CAPTURING_PHASE", js_mknum(1));
	js_set(js, event_fn, "AT_TARGET", js_mknum(2));
	js_set(js, event_fn, "BUBBLING_PHASE", js_mknum(3));
	js_set(js, global, "Event", event_fn);

	g_customevent_proto = js_mkobj(js);
	js_set_proto_init(g_customevent_proto, g_event_proto);
	js_set_sym(js, g_customevent_proto, get_toStringTag_sym(), js_mkstr(js, "CustomEvent", 11));

	ant_value_t customevent_fn = js_make_ctor(js, js_customevent_ctor, g_customevent_proto, "CustomEvent", 11);
	js_set(js, global, "CustomEvent", customevent_fn);

	g_errorevent_proto = js_mkobj(js);
	js_set_proto_init(g_errorevent_proto, g_event_proto);
	js_set_sym(js, g_errorevent_proto, get_toStringTag_sym(), js_mkstr(js, "ErrorEvent", 10));

	ant_value_t errorevent_fn = js_make_ctor(js, js_errorevent_ctor, g_errorevent_proto, "ErrorEvent", 10);
	js_set(js, global, "ErrorEvent", errorevent_fn);

	g_promiserejectionevent_proto = js_mkobj(js);
	js_set_proto_init(g_promiserejectionevent_proto, g_event_proto);
	js_set_sym(js, g_promiserejectionevent_proto, get_toStringTag_sym(), js_mkstr(js, "PromiseRejectionEvent", 21));

	ant_value_t pre_fn = js_make_ctor(js, js_promiserejectionevent_ctor, g_promiserejectionevent_proto, "PromiseRejectionEvent", 21);
	js_set(js, global, "PromiseRejectionEvent", pre_fn);

	ant_value_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_sym(js, eventtarget_proto, get_toStringTag_sym(), js_mkstr(js, "EventTarget", 11));

	ant_value_t eventtarget_ctor = js_mkobj(js);
	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);
	ant_value_t eventtarget_fn = js_obj_to_func_ex(eventtarget_ctor, SV_CALL_IS_DEFAULT_CTOR);
	js_set(js, eventtarget_proto, "constructor", eventtarget_fn);
	js_set_descriptor(js, eventtarget_proto, "constructor", 11, JS_DESC_W \| JS_DESC_C);

	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, "EventTarget", eventtarget_fn);
	}

	static void mark_event_type_listeners(ant_t js, gc_mark_fn mark, EventType events) {
	EventType evt, tmp;
	HASH_ITER(hh, events, evt, tmp) {
	for (unsigned int i = 0; i < utarray_len(evt->listeners); i++) {
	EventListenerEntry e = (EventListenerEntry )utarray_eltptr(evt->listeners, i);
	mark(js, e->callback);
	if (vtype(e->signal) != T_UNDEF) mark(js, e->signal);
	}
	}}

	void gc_mark_events(ant_t *js, gc_mark_fn mark) {
	mark_event_type_listeners(js, mark, global_events);
	for (emitter_reg_t *reg = emitter_registry; reg; reg = reg->next) {
	if (reg->events) mark_event_type_listeners(js, mark, reg->events);
	}
	if (g_isTrusted_getter) mark(js, g_isTrusted_getter);
	if (g_event_proto) mark(js, g_event_proto);
	if (g_customevent_proto) mark(js, g_customevent_proto);
	if (g_errorevent_proto) mark(js, g_errorevent_proto);
	if (g_promiserejectionevent_proto) mark(js, g_promiserejectionevent_proto);
	}

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