christiancabp · July 4, 2022 14:54 · Nov 1, 2021
diff --git a/EventEmitter.js b/EventEmitter.js
@@ -0,0 +1,197 @@
+export default class EventEmitter
+{
+    constructor()
+    {
+        this.callbacks = {}
+        this.callbacks.base = {}
+    }
+
+    on(_names, callback)
+    {
+        // Errors
+        if(typeof _names === 'undefined' || _names === '')
+        {
+            console.warn('wrong names')
+            return false
+        }
+
+        if(typeof callback === 'undefined')
+        {
+            console.warn('wrong callback')
+            return false
+        }
+
+        // Resolve names
+        const names = this.resolveNames(_names)
+
+        // Each name
+        names.forEach((_name) =>
+        {
+            // Resolve name
+            const name = this.resolveName(_name)
+
+            // Create namespace if not exist
+            if(!(this.callbacks[ name.namespace ] instanceof Object))
+                this.callbacks[ name.namespace ] = {}
+
+            // Create callback if not exist
+            if(!(this.callbacks[ name.namespace ][ name.value ] instanceof Array))
+                this.callbacks[ name.namespace ][ name.value ] = []
+
+            // Add callback
+            this.callbacks[ name.namespace ][ name.value ].push(callback)
+        })
+
+        return this
+    }
+
+    off(_names)
+    {
+        // Errors
+        if(typeof _names === 'undefined' || _names === '')
+        {
+            console.warn('wrong name')
+            return false
+        }
+
+        // Resolve names
+        const names = this.resolveNames(_names)
+
+        // Each name
+        names.forEach((_name) =>
+        {
+            // Resolve name
+            const name = this.resolveName(_name)
+
+            // Remove namespace
+            if(name.namespace !== 'base' && name.value === '')
+            {
+                delete this.callbacks[ name.namespace ]
+            }
+
+            // Remove specific callback in namespace
+            else
+            {
+                // Default
+                if(name.namespace === 'base')
+                {
+                    // Try to remove from each namespace
+                    for(const namespace in this.callbacks)
+                    {
+                        if(this.callbacks[ namespace ] instanceof Object && this.callbacks[ namespace ][ name.value ] instanceof Array)
+                        {
+                            delete this.callbacks[ namespace ][ name.value ]
+
+                            // Remove namespace if empty
+                            if(Object.keys(this.callbacks[ namespace ]).length === 0)
+                                delete this.callbacks[ namespace ]
+                        }
+                    }
+                }
+
+                // Specified namespace
+                else if(this.callbacks[ name.namespace ] instanceof Object && this.callbacks[ name.namespace ][ name.value ] instanceof Array)
+                {
+                    delete this.callbacks[ name.namespace ][ name.value ]
+
+                    // Remove namespace if empty
+                    if(Object.keys(this.callbacks[ name.namespace ]).length === 0)
+                        delete this.callbacks[ name.namespace ]
+                }
+            }
+        })
+
+        return this
+    }
+
+    trigger(_name, _args)
+    {
+        // Errors
+        if(typeof _name === 'undefined' || _name === '')
+        {
+            console.warn('wrong name')
+            return false
+        }
+
+        let finalResult = null
+        let result = null
+
+        // Default args
+        const args = !(_args instanceof Array) ? [] : _args
+
+        // Resolve names (should on have one event)
+        let name = this.resolveNames(_name)
+
+        // Resolve name
+        name = this.resolveName(name[ 0 ])
+
+        // Default namespace
+        if(name.namespace === 'base')
+        {
+            // Try to find callback in each namespace
+            for(const namespace in this.callbacks)
+            {
+                if(this.callbacks[ namespace ] instanceof Object && this.callbacks[ namespace ][ name.value ] instanceof Array)
+                {
+                    this.callbacks[ namespace ][ name.value ].forEach(function(callback)
+                    {
+                        result = callback.apply(this, args)
+
+                        if(typeof finalResult === 'undefined')
+                        {
+                            finalResult = result
+                        }
+                    })
+                }
+            }
+        }
+
+        // Specified namespace
+        else if(this.callbacks[ name.namespace ] instanceof Object)
+        {
+            if(name.value === '')
+            {
+                console.warn('wrong name')
+                return this
+            }
+
+            this.callbacks[ name.namespace ][ name.value ].forEach(function(callback)
+            {
+                result = callback.apply(this, args)
+
+                if(typeof finalResult === 'undefined')
+                    finalResult = result
+            })
+        }
+
+        return finalResult
+    }
+
+    resolveNames(_names)
+    {
+        let names = _names
+        names = names.replace(/[^a-zA-Z0-9 ,/.]/g, '')
+        names = names.replace(/[,/]+/g, ' ')
+        names = names.split(' ')
+
+        return names
+    }
+
+    resolveName(name)
+    {
+        const newName = {}
+        const parts = name.split('.')
+
+        newName.original  = name
+        newName.value     = parts[ 0 ]
+        newName.namespace = 'base' // Base namespace
+
+        // Specified namespace
+        if(parts.length > 1 && parts[ 1 ] !== '')
+        {
+            newName.namespace = parts[ 1 ]
+        }
+
+        return newName
+    }
+}