546 lines
12 KiB
C++
546 lines
12 KiB
C++
#ifndef _EVENT_EMITTER_
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#define _EVENT_EMITTER_
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#include <addon-tools.hpp>
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#include <map>
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#include <deque>
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#include <iostream> // -> std::cout << "..." << std::endl;
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#define THIS_EMITTER \
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EventEmitter *emitter = ObjectWrap::Unwrap<EventEmitter>(info.This());
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class EventEmitter : public Nan::ObjectWrap {
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typedef Nan::CopyablePersistentTraits<v8::Function>::CopyablePersistent FN_TYPE;
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typedef std::deque<FN_TYPE> VEC_TYPE;
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typedef std::map<std::string, VEC_TYPE> MAP_TYPE;
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typedef std::map<int, FN_TYPE> FNMAP_TYPE;
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typedef VEC_TYPE::iterator IT_TYPE;
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typedef MAP_TYPE::iterator MAP_IT_TYPE;
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typedef FNMAP_TYPE::iterator FNMAP_IT_TYPE;
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protected:
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EventEmitter () {
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_maxListeners = 0;
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_freeId = 0;
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}
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virtual ~EventEmitter () {}
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static void extendPrototype(v8::Local<v8::FunctionTemplate> &proto) {
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Nan::SetPrototypeMethod(proto, "listenerCount", jsListenerCount);
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Nan::SetPrototypeMethod(proto, "addListener", jsAddListener);
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Nan::SetPrototypeMethod(proto, "emit", jsEmit);
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Nan::SetPrototypeMethod(proto, "eventNames", jsEventNames);
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Nan::SetPrototypeMethod(proto, "getMaxListeners", jsGetMaxListeners);
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Nan::SetPrototypeMethod(proto, "listeners", jsListeners);
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Nan::SetPrototypeMethod(proto, "on", jsOn);
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Nan::SetPrototypeMethod(proto, "once", jsOnce);
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Nan::SetPrototypeMethod(proto, "prependListener", jsPrependListener);
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Nan::SetPrototypeMethod(proto, "prependOnceListener", jsPrependOnceListener);
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Nan::SetPrototypeMethod(proto, "removeAllListeners", jsRemoveAllListeners);
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Nan::SetPrototypeMethod(proto, "removeListener", jsRemoveListener);
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Nan::SetPrototypeMethod(proto, "setMaxListeners", jsSetMaxListeners);
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Nan::SetPrototypeMethod(proto, "rawListeners", jsRawListeners);
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}
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static void extendConstructor(v8::Local<v8::Function> &ctorFn) {
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v8::Local<v8::Object> ctor = v8::Local<v8::Object>::Cast(ctorFn);
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Nan::SetMethod(ctor, "listenerCount", jsStaticListenerCount);
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}
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public:
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// C++ side emit() method
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void emit(const std::string &name, int argc = 0, v8::Local<v8::Value> *argv = NULL) {
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// Important! As actual get map[key] produces a new (empty) map entry
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if ( _listeners.find(name) == _listeners.end() ) {
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return;
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}
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// A copy is intended, because handlers can call removeListener (and they DO)
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VEC_TYPE list = _listeners[name];
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if (list.empty()) {
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return;
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}
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for (IT_TYPE it = list.begin(); it != list.end(); ++it) {
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Nan::Callback callback(Nan::New(*it));
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if ( ! callback.IsEmpty() ) {
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callback.Call(argc, argv);
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}
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}
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}
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// C++ side on() method
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void on(const std::string &name, v8::Local<v8::Value> that, const std::string &method) {
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v8::Local<v8::String> code = JS_STR(
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"((emitter, name, that, method) => emitter.on(name, that[method]))"
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);
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v8::Local<v8::Function> connector = v8::Local<v8::Function>::Cast(v8::Script::Compile(code)->Run());
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Nan::Callback connectorCb(connector);
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v8::Local<v8::Object> emitter = Nan::New<v8::Object>();
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this->Wrap(emitter);
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v8::Local<v8::Value> argv[] = { emitter, JS_STR(name.c_str()), that, JS_STR(method.c_str()) };
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connectorCb.Call(4, argv);
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}
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protected:
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// Deprecated static method
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static NAN_METHOD(jsStaticListenerCount) {
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REQ_OBJ_ARG(0, obj);
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EventEmitter *emitter = ObjectWrap::Unwrap<EventEmitter>(obj);
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REQ_UTF8_ARG(1, name);
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const VEC_TYPE &list = emitter->_listeners[*name];
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RET_VALUE(JS_INT(static_cast<int>(list.size())));
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}
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static NAN_METHOD(jsAddListener) { _wrapListener(info); }
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static NAN_METHOD(jsEmit) { THIS_EMITTER;
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REQ_UTF8_ARG(0, name);
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int length = info.Length();
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std::vector< v8::Local<v8::Value> > args;
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for (int i = 1; i < length; i++) {
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args.push_back(info[i]);
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}
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emitter->emit(*name, length - 1, &args[0]);
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}
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static NAN_METHOD(jsEventNames) { THIS_EMITTER;
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v8::Local<v8::Array> jsNames = Nan::New<v8::Array>(emitter->_raw.size());
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if (emitter->_raw.empty()) {
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RET_VALUE(jsNames);
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return;
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}
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int i = 0;
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for (MAP_IT_TYPE it = emitter->_raw.begin(); it != emitter->_raw.end(); ++it, i++) {
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jsNames->Set(JS_INT(i), JS_STR(it->first));
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}
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RET_VALUE(jsNames);
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}
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static NAN_METHOD(jsGetMaxListeners) { THIS_EMITTER;
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RET_VALUE(JS_INT(emitter->_maxListeners));
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}
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static NAN_METHOD(jsListenerCount) { THIS_EMITTER;
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REQ_UTF8_ARG(0, name);
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const VEC_TYPE &list = emitter->_listeners[*name];
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RET_VALUE(JS_INT(static_cast<int>(list.size())));
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}
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static NAN_METHOD(jsListeners) { THIS_EMITTER;
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REQ_UTF8_ARG(0, name);
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VEC_TYPE &list = emitter->_listeners[*name];
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v8::Local<v8::Array> jsListeners = Nan::New<v8::Array>(list.size());
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if (list.empty()) {
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RET_VALUE(jsListeners);
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return;
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}
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int i = 0;
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for (IT_TYPE it = list.begin(); it != list.end(); ++it, i++) {
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jsListeners->Set(JS_INT(i), Nan::New(*it));
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}
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RET_VALUE(jsListeners);
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}
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static inline void _addListener(
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const Nan::FunctionCallbackInfo<v8::Value> &info,
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const std::string &name,
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Nan::Persistent<v8::Function> &cb,
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bool isFront
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) { THIS_EMITTER;
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v8::Local<v8::Value> args[] = { info[0], info[1] };
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emitter->emit("newListener", 2, args);
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if (isFront) {
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emitter->_listeners[name].push_front(cb);
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emitter->_raw[name].push_front(cb);
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} else {
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emitter->_listeners[name].push_back(cb);
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emitter->_raw[name].push_back(cb);
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}
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if (emitter->_maxListeners > 0 && emitter->_raw.size() > emitter->_maxListeners) {
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std::cout << "EventEmitter Warning: too many listeners (";
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std::cout << emitter->_raw.size() << " > " << emitter->_maxListeners;
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std::cout << ") possible memory leak." << std::endl;
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v8::Local<v8::String> code = JS_STR("(new Error()).stack");
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v8::Local<v8::String> stack = v8::Local<v8::String>::Cast(v8::Script::Compile(code)->Run());
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Nan::Utf8String stackStr(stack);
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std::cout << *stackStr << std::endl;
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}
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}
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static inline void _wrapListener(
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const Nan::FunctionCallbackInfo<v8::Value> &info,
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bool isFront = false
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) {
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REQ_UTF8_ARG(0, name);
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REQ_FUN_ARG(1, cb);
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Nan::Persistent<v8::Function> persistentCb;
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persistentCb.Reset(cb);
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_addListener(info, *name, persistentCb, isFront);
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}
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static inline void _addOnceListener(
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const Nan::FunctionCallbackInfo<v8::Value> &info,
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const std::string &name,
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Nan::Persistent<v8::Function> &raw,
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Nan::Persistent<v8::Function> &cb,
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bool isFront
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) { THIS_EMITTER;
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v8::Local<v8::Value> args[] = { info[0], info[1] };
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emitter->emit("newListener", 2, args);
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if (isFront) {
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emitter->_listeners[name].push_front(cb);
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emitter->_raw[name].push_front(raw);
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} else {
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emitter->_listeners[name].push_back(cb);
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emitter->_raw[name].push_back(raw);
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}
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int nextId = emitter->_freeId++;
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emitter->_wrappedIds[nextId] = cb;
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emitter->_rawIds[nextId] = raw;
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}
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static inline void _wrapOnceListener(
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const Nan::FunctionCallbackInfo<v8::Value> &info,
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bool isFront = false
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) {
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REQ_UTF8_ARG(0, name);
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REQ_FUN_ARG(1, raw);
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v8::Local<v8::String> code = JS_STR(
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"((emitter, name, cb) => (...args) => {\n\
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cb(...args);\n\
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emitter.removeListener(name, cb);\n\
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})"
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);
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v8::Local<v8::Function> decor = v8::Local<v8::Function>::Cast(v8::Script::Compile(code)->Run());
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Nan::Callback decorCb(decor);
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v8::Local<v8::Value> argv[] = { info.This(), info[0], raw };
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v8::Local<v8::Function> wrap = v8::Local<v8::Function>::Cast(decorCb.Call(3, argv));
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Nan::Persistent<v8::Function> persistentWrap;
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persistentWrap.Reset(wrap);
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Nan::Persistent<v8::Function> persistentRaw;
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persistentRaw.Reset(raw);
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_addOnceListener(info, *name, persistentRaw, persistentWrap, isFront);
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}
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static NAN_METHOD(jsOn) { _wrapListener(info); }
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static NAN_METHOD(jsOnce) { _wrapOnceListener(info); }
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static NAN_METHOD(jsPrependListener) { _wrapListener(info, true); }
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static NAN_METHOD(jsPrependOnceListener) { _wrapOnceListener(info, true); }
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static NAN_METHOD(jsRemoveAllListeners) { THIS_EMITTER;
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if (info.Length() > 0 && info[0]->IsString()) {
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MAP_TYPE tmpMap = emitter->_raw;
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emitter->_listeners.clear();
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emitter->_raw.clear();
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emitter->_wrappedIds.clear();
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emitter->_rawIds.clear();
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for (MAP_IT_TYPE itMap = tmpMap.begin(); itMap != tmpMap.end(); ++itMap) {
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const std::string ¤t = itMap->first;
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VEC_TYPE &list = itMap->second;
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for (IT_TYPE it = list.begin(); it != list.end(); ++it) {
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v8::Local<v8::Value> args[] = { JS_STR(current.c_str()), Nan::New(*it) };
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emitter->emit("removeListener", 2, args);
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}
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}
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return;
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}
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REQ_UTF8_ARG(0, n);
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std::string name = std::string(*n);
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VEC_TYPE &list = emitter->_raw[name];
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if (list.empty()) {
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return;
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}
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if (emitter->_rawIds.size()) {
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std::vector<int> removes;
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for (IT_TYPE it = list.begin(); it != list.end(); ++it) {
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FN_TYPE fn = *it;
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for (FNMAP_IT_TYPE itRaw = emitter->_rawIds.begin(); itRaw != emitter->_rawIds.end(); ++itRaw) {
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if (fn == itRaw->second) {
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removes.push_back(itRaw->first);
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}
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}
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}
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if (removes.size()) {
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for (std::vector<int>::const_iterator it = removes.begin(); it != removes.end(); ++it) {
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emitter->_wrappedIds.erase(*it);
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emitter->_rawIds.erase(*it);
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}
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}
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}
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VEC_TYPE tmpVec = emitter->_raw[name];
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emitter->_listeners[name].clear();
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emitter->_raw[name].clear();
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for (IT_TYPE it = tmpVec.begin(); it != tmpVec.end(); ++it) {
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v8::Local<v8::Value> args[] = { JS_STR(name.c_str()), Nan::New(*it) };
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emitter->emit("removeListener", 2, args);
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}
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}
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static NAN_METHOD(jsRemoveListener) { THIS_EMITTER;
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REQ_UTF8_ARG(0, n);
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REQ_FUN_ARG(1, raw);
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Nan::Persistent<v8::Function> persistentRaw;
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persistentRaw.Reset(raw);
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std::string name = std::string(*n);
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VEC_TYPE &rawList = emitter->_raw[name];
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if (rawList.empty()) {
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return;
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}
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v8::Local<v8::Value> args[] = { info[0], info[1] };
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for (IT_TYPE it = rawList.begin(); it != rawList.end(); ++it) {
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if (*it == persistentRaw) {
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rawList.erase(it);
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if (rawList.empty()) {
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emitter->_raw.erase(name);
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}
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break;
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}
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}
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VEC_TYPE &wrapList = emitter->_listeners[name];
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if (emitter->_wrappedIds.size() == 0) {
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for (IT_TYPE it = wrapList.begin(); it != wrapList.end(); ++it) {
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if (*it == persistentRaw) {
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wrapList.erase(it);
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if (wrapList.empty()) {
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emitter->_listeners.erase(name);
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}
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break;
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}
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}
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emitter->emit("removeListener", 2, args);
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return;
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}
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for (FNMAP_IT_TYPE itRaw = emitter->_rawIds.begin(); itRaw != emitter->_rawIds.end(); ++itRaw) {
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if (persistentRaw == itRaw->second) {
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FN_TYPE fn = emitter->_wrappedIds[itRaw->first];
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for (IT_TYPE it = wrapList.begin(); it != wrapList.end(); ++it) {
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if (*it == fn) {
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wrapList.erase(it);
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if (wrapList.empty()) {
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emitter->_listeners.erase(name);
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}
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break;
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}
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}
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emitter->_wrappedIds.erase(itRaw->first);
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emitter->_rawIds.erase(itRaw->first);
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break;
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}
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}
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emitter->emit("removeListener", 2, args);
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}
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static NAN_METHOD(jsSetMaxListeners) { THIS_EMITTER;
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REQ_INT32_ARG(0, value);
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emitter->_maxListeners = value;
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}
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static NAN_METHOD(jsRawListeners) { THIS_EMITTER;
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REQ_UTF8_ARG(0, name);
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VEC_TYPE &list = emitter->_raw[*name];
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v8::Local<v8::Array> jsListeners = Nan::New<v8::Array>(list.size());
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if (list.empty()) {
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RET_VALUE(jsListeners);
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return;
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}
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int i = 0;
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for (IT_TYPE it = list.begin(); it != list.end(); ++it, i++) {
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jsListeners->Set(JS_INT(i), Nan::New(*it));
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}
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RET_VALUE(jsListeners);
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}
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private:
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int _maxListeners;
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MAP_TYPE _listeners;
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MAP_TYPE _raw;
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int _freeId;
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FNMAP_TYPE _wrappedIds;
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FNMAP_TYPE _rawIds;
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};
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#endif // _EVENT_EMITTER_
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