gistfile1.js

/* Hooks */

var Hooks = function() {
  this.list = {};
  this.hookTable = {};
  this.hookNum = 0;
}

Hooks.prototype = {
  add: function(names, fn, priority, off) {
    if(typeof names != "string")
      console.log("Cannot add type as hook: " + n)

    var ns = names.split(",")
    for(var i in ns) {
      if( this.list[ns[i]] )
        console.log("warn", "replacing hook: ", ns[i])
      this.list[ns[i]] = { name: ns[i], fn: fn, priority: priority == null ? 10 : priority, off: off, num: (this.hookNum++) };
    }
  },
  remove: function(event) {
    this.hookTable[event] = []
  },
  getOnHooks: function(event, param, options) {
    var hooks = this.hookTable[event] = this.hookTable[event] || this.calcHooks(event);
    var onhooks = []
    for(var i in hooks) {
      if(!hooks[i].off) {
        onhooks.push(hooks[i])        
        if(this.logging)
          console.log("about to fire hook: ", hooks[i].name, "from args:", [event, param, options])
      }
    }
    return onhooks
  },
  fire: function(event, param, options) {
    // var event = (event instanceof Array) ? event : [event]
    // var hooks = [] 
    // for(var i in event)
    //   hooks.push( this.getOnHooks(event[i], param, options) )
    
    var hooks = this.getOnHooks(event, param, options)
    for(var i in hooks) 
      hooks[i].fn(param, options)
  },
  calcHooks: function(event) {
    var hooks = []
    for(var i in this.list) {
      var hook = this.list[i];
      
      var hk = hook.name.split(":");
      var ev = event.split(":");
      var add = true
      for(var i in ev) {
        if(hk[i] != ev[i]) {
          add = false
          break
        }
      }
      if(add)
        hooks.push(hook)
    }

    // if(hooks.length == 0)
    //   console.("Warning: no hooks found for event: " + event)
    hooks.sort(function(a,b) {
      return (a.priority - b.priority) || (a.num - b.num); //Chrome v1 seems to have slightly different sorting ?!
    })
    return hooks;
  }
};

/*

var hooks = new Hooks()
hooks.add("Event", function() {  console.log("Event fired with default priority") })
hooks.add("Event:subevent", function() {  console.log("Event:subevent fired with default priority") })

hooks.fire("Event")
  => "Event fired with default priority"
  => "Event:subevent fired with default priority"

hooks.fire("Event:subevent")
  => "Event:subevent fired with default priority"

hooks.add("Event", function() { console.log("Event fired with high priority") }, 1)
hooks.add("Event", function() { console.log("Event fired with low priority") }, 100)
hooks.list["Event:subevent"].off = true

hooks.fire("Event")
  => "Event fired with high priority"
  => "Event fired with default priority"
  => "Event fired with low priority"

*/