Retrospring/lib/assets/javascripts/cheet.js

/*
The MIT License (MIT)

Copyright (c) 2013 Louis Acresti

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/


(function (global) {
  'use strict';

  var cheet,
      sequences = {},
      keys = {
        backspace: 8,
        tab: 9,
        enter: 13,
        'return': 13,
        shift: 16,
        '⇧': 16,
        control: 17,
        ctrl: 17,
        '⌃': 17,
        alt: 18,
        option: 18,
        '⌥': 18,
        pause: 19,
        capslock: 20,
        esc: 27,
        space: 32,
        pageup: 33,
        pagedown: 34,
        end: 35,
        home: 36,
        left: 37,
        L: 37,
        '←': 37,
        up: 38,
        U: 38,
        '↑': 38,
        right: 39,
        R: 39,
        '→': 39,
        down: 40,
        D: 40,
        '↓': 40,
        insert: 45,
        'delete': 46,
        '0': 48,
        '1': 49,
        '2': 50,
        '3': 51,
        '4': 52,
        '5': 53,
        '6': 54,
        '7': 55,
        '8': 56,
        '9': 57,
        a: 65,
        b: 66,
        c: 67,
        d: 68,
        e: 69,
        f: 70,
        g: 71,
        h: 72,
        i: 73,
        j: 74,
        k: 75,
        l: 76,
        m: 77,
        n: 78,
        o: 79,
        p: 80,
        q: 81,
        r: 82,
        s: 83,
        t: 84,
        u: 85,
        v: 86,
        w: 87,
        x: 88,
        y: 89,
        z: 90,
        '⌘': 91,
        command: 91,
        kp_0: 96,
        kp_1: 97,
        kp_2: 98,
        kp_3: 99,
        kp_4: 100,
        kp_5: 101,
        kp_6: 102,
        kp_7: 103,
        kp_8: 104,
        kp_9: 105,
        kp_multiply: 106,
        kp_plus: 107,
        kp_minus: 109,
        kp_decimal: 110,
        kp_divide: 111,
        f1: 112,
        f2: 113,
        f3: 114,
        f4: 115,
        f5: 116,
        f6: 117,
        f7: 118,
        f8: 119,
        f9: 120,
        f10: 121,
        f11: 122,
        f12: 123,
        equal: 187,
        '=': 187,
        comma: 188,
        ',': 188,
        minus: 189,
        '-': 189,
        period: 190,
        '.': 190
      },
      Sequence,
      NOOP = function NOOP() {},
      held = {};

  Sequence = function Sequence (str, next, fail, done) {
    var i;

    this.str = str;
    this.next = next ? next : NOOP;
    this.fail = fail ? fail : NOOP;
    this.done = done ? done : NOOP;

    this.seq = str.split(' ');
    this.keys = [];

    for (i=0; i<this.seq.length; ++i) {
      this.keys.push(keys[this.seq[i]]);
    }

    this.idx = 0;
  };

  Sequence.prototype.keydown = function keydown (keyCode) {
    var i = this.idx;
    if (keyCode !== this.keys[i]) {
      if (i > 0) {
        this.reset();
        this.fail(this.str);
        cheet.__fail(this.str);
      }
      return;
    }

    this.next(this.str, this.seq[i], i, this.seq);
    cheet.__next(this.str, this.seq[i], i, this.seq);

    if (++this.idx === this.keys.length) {
      this.done(this.str);
      cheet.__done(this.str);
      this.reset();
    }
  };

  Sequence.prototype.reset = function () {
    this.idx = 0;
  };

  cheet = function cheet (str, handlers) {
    var next, fail, done;

    if (typeof handlers === 'function') {
      done = handlers;
    } else if (handlers !== null && handlers !== undefined) {
      next = handlers.next;
      fail = handlers.fail;
      done = handlers.done;
    }

    sequences[str] = new Sequence(str, next, fail, done);
  };

  cheet.disable = function disable (str) {
    delete sequences[str];
  };

  function keydown (e) {
    var id,
        k = e ? e.keyCode : event.keyCode;

    if (held[k]) return;
    held[k] = true;

    for (id in sequences) {
      sequences[id].keydown(k);
    }
  }

  function keyup (e) {
    var k = e ? e.keyCode : event.keyCode;
    held[k] = false;
  }

  function resetHeldKeys (e) {
    var k;
    for (k in held) {
      held[k] = false;
    }
  }

  function on (obj, type, fn) {
    if (obj.addEventListener) {
      obj.addEventListener(type, fn, false);
    } else if (obj.attachEvent) {
      obj['e' + type + fn] = fn;
      obj[type + fn] = function () {
        obj['e' + type + fn](window.event);
      };
      obj.attachEvent('on' + type, obj[type + fn]);
    }
  }

  on(window, 'keydown', keydown);
  on(window, 'keyup', keyup);
  on(window, 'blur', resetHeldKeys);
  on(window, 'focus', resetHeldKeys);

  cheet.__next = NOOP;
  cheet.next = function next (fn) {
    cheet.__next = fn === null ? NOOP : fn;
  };

  cheet.__fail = NOOP;
  cheet.fail = function fail (fn) {
    cheet.__fail = fn === null ? NOOP : fn;
  };

  cheet.__done = NOOP;
  cheet.done = function done (fn) {
    cheet.__done = fn === null ? NOOP : fn;
  };

  cheet.reset = function reset (id) {
    var seq = sequences[id];
    if (!(seq instanceof Sequence)) {
      console.warn('cheet: Unknown sequence: ' + id);
      return;
    }

    seq.reset();
  };

  global.cheet = cheet;

  if (typeof define === 'function' && define.amd) {
    define([], function () { return cheet; });
  } else if (typeof module !== 'undefined' && module !== null) {
    module.exports = cheet;
  }

})(this);