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# Eve
Tiny event helping JavaScript library.
## eve(name, scope, varargs)
Fires event with given `name`, given scope and other parameters.
### Parameters
- _name_ **string**
name of the _event_, dot (`.`) or slash (`/`) separated
- _scope_ **object**
context for the event handlers
- _varargs_ **...**
the rest of arguments will be sent to event handlers
**Returns:** **object** array of returned values from the listeners. Array has two methods `.firstDefined()` and `.lastDefined()` to get first or last not `undefined` value.
## eve.listeners(name)
Internal method which gives you array of all event handlers that will be triggered by the given `name`.
### Parameters
- _name_ **string**
name of the event, dot (`.`) or slash (`/`) separated
**Returns:** **array** array of event handlers
## eve.separator(separator)
If for some reasons you don’t like default separators (`.` or `/`) you can specify yours
here. Be aware that if you pass a string longer than one character it will be treated as
a list of characters.
### Parameters
- _separator_ **string**
new separator. Empty string resets to default: `.` or `/`.
## eve.on(name, f, name, f)
Binds given event handler with a given name. You can use wildcards “`*`” for the names:
```js
eve.on("*.under.*", f);
eve("mouse.under.floor"); // triggers f
```
Use <a href="#eve" class="dr-link">eve</a> to trigger the listener.
### Parameters
- _name_ **string**
name of the event, dot (`.`) or slash (`/`) separated, with optional wildcards
- _f_ **function**
event handler function
- _name_ **array**
if you don’t want to use separators, you can use array of strings
- _f_ **function**
event handler function
**Returns:** **function** returned function accepts a single numeric parameter that represents z-index of the handler. It is an optional feature and only used when you need to ensure that some subset of handlers will be invoked in a given order, despite of the order of assignment.
### Example:
```js
eve.on("mouse", eatIt)(2);
eve.on("mouse", scream);
eve.on("mouse", catchIt)(1);
```
This will ensure that `catchIt` function will be called before `eatIt`.
If you want to put your handler before non-indexed handlers, specify a negative value.
Note: I assume most of the time you don’t need to worry about z-index, but it’s nice to have this feature “just in case”.
## eve.f(event, varargs)
Returns function that will fire given event with optional arguments.
Arguments that will be passed to the result function will be also
concated to the list of final arguments.
```js
el.onclick = eve.f("click", 1, 2);
eve.on("click", function (a, b, c) {
console.log(a, b, c); // 1, 2, [event object]
});
```
### Parameters
- _event_ **string**
event name
- _varargs_ **…**
and any other arguments
**Returns:** **function** possible event handler function
## eve.stop()
Is used inside an event handler to stop the event, preventing any subsequent listeners from firing.
## eve.nt([subname])
Could be used inside event handler to figure out actual name of the event.
### Parameters
- _subname_ **string**
subname of the event
**Returns:** **string** name of the event, if `subname` is not specified
or
**Returns:** **boolean** `true`, if current event’s name contains `subname`
## eve.nts()
Could be used inside event handler to figure out actual name of the event.
**Returns:** **array** names of the event
## eve.off(name, f)
Removes given function from the list of event listeners assigned to given name.
If no arguments specified all the events will be cleared.
### Parameters
- _name_ **string**
name of the event, dot (`.`) or slash (`/`) separated, with optional wildcards
- _f_ **function**
event handler function
## eve.unbind()
See <a href="#eve.off" class="dr-link">eve.off</a>
## eve.once(name, f)
Binds given event handler with a given name to only run once then unbind itself.
```js
eve.once("login", f);
eve("login"); // triggers f
eve("login"); // no listeners
```
Use <a href="#eve" class="dr-link">eve</a> to trigger the listener.
### Parameters
- _name_ **string**
name of the event, dot (`.`) or slash (`/`) separated, with optional wildcards
- _f_ **function**
event handler function
**Returns:** **function** same return function as <a href="#eve.on" class="dr-link">eve.on</a>
## eve.version()
Current version of the library.

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{
"name": "eve",
"repo": "adobe-webplatform/eve",
"description": "Custom Events",
"version": "0.5.4",
"keywords": ["events"],
"dependencies": {},
"development": {},
"main": "eve.js",
"scripts": [
"eve.js"
]
}

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{
"title": "Eve",
"output": "README.md",
"template": "template.dot",
"css": "custom",
"files": [{
"url": "eve.js",
"link": "https://github.com/adobe-webplatform/eve/blob/master/eve.js"
}]
}

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<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<title>Eve Use Case</title>
<script src="eve.js"></script>
<script>
var log = function (text) {
log.log = log.log || [];
log.log.push(text);
};
window.onload = function () {
document.getElementById("res").innerHTML = log.log.join("<br>");
};
</script>
<script>
var f1, f2, f3, f4;
// setting up listeners
eve.on("hit", f1 = function () {
log(" I’m hit!");
});
eve.on("hit/face", f2 = function () {
log(" Oh, my face!");
});
eve.on("hit/chest", f3 = function () {
log(" Oh, my chest!");
});
eve.on("hit/*/leg", f4 = function () {
log(" Ouch!");
});
eve.once("hit", function () {
log(" You scoundrel!");
})(-1);
// fire events
log("In your face!");
eve("hit/face");
// I’m hit!
// Oh, my face!
log("Take that!");
// You can use “.” or “/” as delimiter
eve("hit.chest.leg");
// I’m hit!
// Oh, my chest!
// Ouch!
// Unbinding
log("");
eve.unbind("hit", f3);
log("Take that!");
eve("hit.chest.leg");
// I’m hit!
// Ouch!
// Unbinding by wildcard
log("");
eve.unbind("hit/*");
log("In your face!");
eve("hit.face");
// I’m hit!
log("Take that!");
eve("hit.chest.leg");
// I’m hit!
</script>
<pre id="res"></pre>
</html>

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// Copyright (c) 2017 Adobe Systems Incorporated. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ┌────────────────────────────────────────────────────────────┐ \\
// │ Eve 0.5.4 - JavaScript Events Library │ \\
// ├────────────────────────────────────────────────────────────┤ \\
// │ Author Dmitry Baranovskiy (http://dmitry.baranovskiy.com/) │ \\
// └────────────────────────────────────────────────────────────┘ \\
(function (glob) {
var version = "0.5.4",
has = "hasOwnProperty",
separator = /[\.\/]/,
comaseparator = /\s*,\s*/,
wildcard = "*",
numsort = function (a, b) {
return a - b;
},
current_event,
stop,
events = {n: {}},
firstDefined = function () {
for (var i = 0, ii = this.length; i < ii; i++) {
if (typeof this[i] != "undefined") {
return this[i];
}
}
},
lastDefined = function () {
var i = this.length;
while (--i) {
if (typeof this[i] != "undefined") {
return this[i];
}
}
},
objtos = Object.prototype.toString,
Str = String,
isArray = Array.isArray || function (ar) {
return ar instanceof Array || objtos.call(ar) == "[object Array]";
},
/*\
* eve
[ method ]
* Fires event with given `name`, given scope and other parameters.
- name (string) name of the *event*, dot (`.`) or slash (`/`) separated
- scope (object) context for the event handlers
- varargs (...) the rest of arguments will be sent to event handlers
= (object) array of returned values from the listeners. Array has two methods `.firstDefined()` and `.lastDefined()` to get first or last not `undefined` value.
\*/
eve = function (name, scope) {
var oldstop = stop,
args = Array.prototype.slice.call(arguments, 2),
listeners = eve.listeners(name),
z = 0,
l,
indexed = [],
queue = {},
out = [],
ce = current_event;
out.firstDefined = firstDefined;
out.lastDefined = lastDefined;
current_event = name;
stop = 0;
for (var i = 0, ii = listeners.length; i < ii; i++) if ("zIndex" in listeners[i]) {
indexed.push(listeners[i].zIndex);
if (listeners[i].zIndex < 0) {
queue[listeners[i].zIndex] = listeners[i];
}
}
indexed.sort(numsort);
while (indexed[z] < 0) {
l = queue[indexed[z++]];
out.push(l.apply(scope, args));
if (stop) {
stop = oldstop;
return out;
}
}
for (i = 0; i < ii; i++) {
l = listeners[i];
if ("zIndex" in l) {
if (l.zIndex == indexed[z]) {
out.push(l.apply(scope, args));
if (stop) {
break;
}
do {
z++;
l = queue[indexed[z]];
l && out.push(l.apply(scope, args));
if (stop) {
break;
}
} while (l)
} else {
queue[l.zIndex] = l;
}
} else {
out.push(l.apply(scope, args));
if (stop) {
break;
}
}
}
stop = oldstop;
current_event = ce;
return out;
};
// Undocumented. Debug only.
eve._events = events;
/*\
* eve.listeners
[ method ]
* Internal method which gives you array of all event handlers that will be triggered by the given `name`.
- name (string) name of the event, dot (`.`) or slash (`/`) separated
= (array) array of event handlers
\*/
eve.listeners = function (name) {
var names = isArray(name) ? name : name.split(separator),
e = events,
item,
items,
k,
i,
ii,
j,
jj,
nes,
es = [e],
out = [];
for (i = 0, ii = names.length; i < ii; i++) {
nes = [];
for (j = 0, jj = es.length; j < jj; j++) {
e = es[j].n;
items = [e[names[i]], e[wildcard]];
k = 2;
while (k--) {
item = items[k];
if (item) {
nes.push(item);
out = out.concat(item.f || []);
}
}
}
es = nes;
}
return out;
};
/*\
* eve.separator
[ method ]
* If for some reasons you don’t like default separators (`.` or `/`) you can specify yours
* here. Be aware that if you pass a string longer than one character it will be treated as
* a list of characters.
- separator (string) new separator. Empty string resets to default: `.` or `/`.
\*/
eve.separator = function (sep) {
if (sep) {
sep = Str(sep).replace(/(?=[\.\^\]\[\-])/g, "\\");
sep = "[" + sep + "]";
separator = new RegExp(sep);
} else {
separator = /[\.\/]/;
}
};
/*\
* eve.on
[ method ]
**
* Binds given event handler with a given name. You can use wildcards “`*`” for the names:
| eve.on("*.under.*", f);
| eve("mouse.under.floor"); // triggers f
* Use @eve to trigger the listener.
**
- name (string) name of the event, dot (`.`) or slash (`/`) separated, with optional wildcards
- f (function) event handler function
**
- name (array) if you don’t want to use separators, you can use array of strings
- f (function) event handler function
**
= (function) returned function accepts a single numeric parameter that represents z-index of the handler. It is an optional feature and only used when you need to ensure that some subset of handlers will be invoked in a given order, despite of the order of assignment.
> Example:
| eve.on("mouse", eatIt)(2);
| eve.on("mouse", scream);
| eve.on("mouse", catchIt)(1);
* This will ensure that `catchIt` function will be called before `eatIt`.
*
* If you want to put your handler before non-indexed handlers, specify a negative value.
* Note: I assume most of the time you don’t need to worry about z-index, but it’s nice to have this feature “just in case”.
\*/
eve.on = function (name, f) {
if (typeof f != "function") {
return function () {};
}
var names = isArray(name) ? isArray(name[0]) ? name : [name] : Str(name).split(comaseparator);
for (var i = 0, ii = names.length; i < ii; i++) {
(function (name) {
var names = isArray(name) ? name : Str(name).split(separator),
e = events,
exist;
for (var i = 0, ii = names.length; i < ii; i++) {
e = e.n;
e = e.hasOwnProperty(names[i]) && e[names[i]] || (e[names[i]] = {n: {}});
}
e.f = e.f || [];
for (i = 0, ii = e.f.length; i < ii; i++) if (e.f[i] == f) {
exist = true;
break;
}
!exist && e.f.push(f);
}(names[i]));
}
return function (zIndex) {
if (+zIndex == +zIndex) {
f.zIndex = +zIndex;
}
};
};
/*\
* eve.f
[ method ]
**
* Returns function that will fire given event with optional arguments.
* Arguments that will be passed to the result function will be also
* concated to the list of final arguments.
| el.onclick = eve.f("click", 1, 2);
| eve.on("click", function (a, b, c) {
| console.log(a, b, c); // 1, 2, [event object]
| });
- event (string) event name
- varargs (…) and any other arguments
= (function) possible event handler function
\*/
eve.f = function (event) {
var attrs = [].slice.call(arguments, 1);
return function () {
eve.apply(null, [event, null].concat(attrs).concat([].slice.call(arguments, 0)));
};
};
/*\
* eve.stop
[ method ]
**
* Is used inside an event handler to stop the event, preventing any subsequent listeners from firing.
\*/
eve.stop = function () {
stop = 1;
};
/*\
* eve.nt
[ method ]
**
* Could be used inside event handler to figure out actual name of the event.
**
- subname (string) #optional subname of the event
**
= (string) name of the event, if `subname` is not specified
* or
= (boolean) `true`, if current event’s name contains `subname`
\*/
eve.nt = function (subname) {
var cur = isArray(current_event) ? current_event.join(".") : current_event;
if (subname) {
return new RegExp("(?:\\.|\\/|^)" + subname + "(?:\\.|\\/|$)").test(cur);
}
return cur;
};
/*\
* eve.nts
[ method ]
**
* Could be used inside event handler to figure out actual name of the event.
**
**
= (array) names of the event
\*/
eve.nts = function () {
return isArray(current_event) ? current_event : current_event.split(separator);
};
/*\
* eve.off
[ method ]
**
* Removes given function from the list of event listeners assigned to given name.
* If no arguments specified all the events will be cleared.
**
- name (string) name of the event, dot (`.`) or slash (`/`) separated, with optional wildcards
- f (function) event handler function
\*/
/*\
* eve.unbind
[ method ]
**
* See @eve.off
\*/
eve.off = eve.unbind = function (name, f) {
if (!name) {
eve._events = events = {n: {}};
return;
}
var names = isArray(name) ? isArray(name[0]) ? name : [name] : Str(name).split(comaseparator);
if (names.length > 1) {
for (var i = 0, ii = names.length; i < ii; i++) {
eve.off(names[i], f);
}
return;
}
names = isArray(name) ? name : Str(name).split(separator);
var e,
key,
splice,
i, ii, j, jj,
cur = [events],
inodes = [];
for (i = 0, ii = names.length; i < ii; i++) {
for (j = 0; j < cur.length; j += splice.length - 2) {
splice = [j, 1];
e = cur[j].n;
if (names[i] != wildcard) {
if (e[names[i]]) {
splice.push(e[names[i]]);
inodes.unshift({
n: e,
name: names[i]
});
}
} else {
for (key in e) if (e[has](key)) {
splice.push(e[key]);
inodes.unshift({
n: e,
name: key
});
}
}
cur.splice.apply(cur, splice);
}
}
for (i = 0, ii = cur.length; i < ii; i++) {
e = cur[i];
while (e.n) {
if (f) {
if (e.f) {
for (j = 0, jj = e.f.length; j < jj; j++) if (e.f[j] == f) {
e.f.splice(j, 1);
break;
}
!e.f.length && delete e.f;
}
for (key in e.n) if (e.n[has](key) && e.n[key].f) {
var funcs = e.n[key].f;
for (j = 0, jj = funcs.length; j < jj; j++) if (funcs[j] == f) {
funcs.splice(j, 1);
break;
}
!funcs.length && delete e.n[key].f;
}
} else {
delete e.f;
for (key in e.n) if (e.n[has](key) && e.n[key].f) {
delete e.n[key].f;
}
}
e = e.n;
}
}
// prune inner nodes in path
prune: for (i = 0, ii = inodes.length; i < ii; i++) {
e = inodes[i];
for (key in e.n[e.name].f) {
// not empty (has listeners)
continue prune;
}
for (key in e.n[e.name].n) {
// not empty (has children)
continue prune;
}
// is empty
delete e.n[e.name];
}
};
/*\
* eve.once
[ method ]
**
* Binds given event handler with a given name to only run once then unbind itself.
| eve.once("login", f);
| eve("login"); // triggers f
| eve("login"); // no listeners
* Use @eve to trigger the listener.
**
- name (string) name of the event, dot (`.`) or slash (`/`) separated, with optional wildcards
- f (function) event handler function
**
= (function) same return function as @eve.on
\*/
eve.once = function (name, f) {
var f2 = function () {
eve.off(name, f2);
return f.apply(this, arguments);
};
return eve.on(name, f2);
};
/*\
* eve.version
[ property (string) ]
**
* Current version of the library.
\*/
eve.version = version;
eve.toString = function () {
return "You are running Eve " + version;
};
glob.eve = eve;
typeof module != "undefined" && module.exports ? module.exports = eve : typeof define === "function" && define.amd ? define("eve", [], function () { return eve; }) : glob.eve = eve;
})(typeof window != "undefined" ? window : this);

73
package.json Normal file
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@ -0,0 +1,73 @@
{
"name" : "eve",
"author" : {
"name" : "Dmitry Baranovskiy",
"email" : "dmitry@baranovskiy.com",
"url" : "http://dmitry.baranovskiy.com"
},
"description" : "Simple custom events",
"license": "Apache-2.0",
"version" : "0.5.4",
"main" : "./eve.js",
"devDependencies": {
"mocha": "*",
"expect.js": "*",
"eslint": "*",
"dr.js": "~0.1.0"
},
"scripts": {
"test": "eslint eve.js",
"build": "node node_modules/dr.js/dr dr.json"
},
"repository": {
"type": "git",
"url": "git@github.com:adobe-webplatform/eve.git"
},
"eslintConfig": {
"globals": {
"window": true,
"console": true
},
"rules": {
"block-scoped-var": 0,
"comma-dangle": 0,
"no-extra-parens": 1,
"no-shadow": 0,
"consistent-return": 0,
"eqeqeq": 0,
"no-new-wrappers": 0,
"no-sequences": 1,
"radix": 2,
"new-parens": 0,
"no-underscore-dangle": 0,
"no-path-concat": 0,
"strict": 0,
"camelcase": 0,
"no-extend-native": 0,
"no-loop-func": 0,
"new-cap": 0,
"no-unused-expressions": 0,
"no-mixed-requires": 0,
"indent": ["error", 4, { "SwitchCase": 1, "VariableDeclarator": 1 }],
"no-multi-spaces": [0, {
"exceptions": {
"VariableDeclarator": true
}
}],
"no-trailing-spaces": [2, { "skipBlankLines": false }],
"no-unused-vars": [2, {"vars": "all", "args": "none"}],
"space-before-function-paren": [2, {"anonymous": "always", "named": "never"}],
"quotes": [
1,
"double",
"avoid-escape"
]
}
}
}

13
template.dot Normal file
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# Eve
Tiny event helping JavaScript library.
{{~it.out :item:index}}
## {{=item[0].name}}
{{~item :line:i}}{{ if (i > 0) { }}{{ if (line.text) { }}{{=line.text.join("\n").replace(/<\/?code>/g, "`").replace(/<\/?em>/g, "_")}}{{ } }}{{ if (line.attr) { }}### Parameters
{{~line.attr :attr:j}}- _{{=attr.name}}_ {{~attr.type :type:k}} **{{=type}}**{{~}}
{{=attr.desc.replace(/<\/?code>/g, "`").replace(/<\/?em>/g, "_")}}
{{~}}{{ } }}{{ if (line.html) { }}{{=line.html.replace(/<\/?code>/g, "`").replace(/<\/?em>/g, "_")}}{{ } }}{{ if (line.head) { }}
### {{=line.head}}{{ } }}{{ if (line.code) { }}```js
{{=line.code.join("\n")}}
```{{ } }}{{ if (line.rtrn) { }}**Returns:** {{~line.rtrn.type :type:k}} **{{=type}}**{{~}} {{=line.rtrn.desc.replace(/<\/?code>/g, "`").replace(/<\/?em>/g, "_")}}{{ } }}
{{ } }}{{~}}{{~}}