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// Copyright (c) 2013 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 0.5.0 - JavaScript Events Library                      │ \\
// ├────────────────────────────────────────────────────────────┤ \\
// │ Author Dmitry Baranovskiy (http://dmitry.baranovskiy.com/) │ \\
// └────────────────────────────────────────────────────────────┘ \\

(function (glob) {
    var version = "0.5.0",
        has = "hasOwnProperty",
        separator = /[\.\/]/,
        comaseparator = /\s*,\s*/,
        wildcard = "*",
        fun = function () {},
        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.

     > Arguments

     - 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 e = events,
                oldstop = stop,
                args = Array.prototype.slice.call(arguments, 2),
                listeners = eve.listeners(name),
                z = 0,
                f = false,
                l,
                indexed = [],
                queue = {},
                out = [],
                ce = current_event,
                errors = [];
            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`.

     > Arguments

     - 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]
     | });
     > Arguments
     - 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.
     **
     > Arguments
     **
     - 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.
     **
     > Arguments
     **
     - 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];
        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]]);
                    }
                } else {
                    for (key in e) if (e[has](key)) {
                        splice.push(e[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;
            }
        }
    };
    /*\
     * 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.
     **
     > Arguments
     **
     - 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;
    };
    (typeof module != "undefined" && module.exports) ? (module.exports = eve) : (typeof define === "function" && define.amd ? (define("eve", [], function() { return eve; })) : (glob.eve = eve));
})(this);
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