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construct/modules/static/js/event.js
2018-02-05 21:24:34 -08:00

116 lines
3.1 KiB
JavaScript

/*
// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.
*/
'use strict';
/******************************************************************************
* Event
*
*/
mc.event = class
{
constructor(event = {})
{
Object.update(this, event);
Object.defaults(this,
{
event_id: mc.m.random.mxid("$"),
origin_server_ts: mc.now(),
});
}
// functors
static is_state(event) { return event.state_key !== undefined; }
static is_not_state(event) { return !mc.event.is_state(event); }
static is_type(type, event) { return event.type == type; }
static is_pending(event) { return !event.event_id.startsWith("$"); }
static is_local(event) { return mc.m.domid(event.event_id) == "mc"; }
static is_not_local(event) { return !mc.event.is_local(event); }
static cmp(a, b) { return a.cmp(b); }
};
/**
* Get events surrounding this event
*/
mc.event.prototype.context = function(opts = {})
{
if(!this.room_id || !this.event_id)
return false;
let handler = (error, data) => callback(arguments, error, data);
return mc.m.rooms.context.get(this.room_id, this.event_id, opts, handler);
};
/**
* Ordering comparator for events.
*/
mc.event.prototype.cmp = function(other)
{
let cmp = (a, b) =>
a == undefined? undefined:
b == undefined? undefined:
a < b? -1:
a > b? 1:
a == b? 0:
undefined;
let age_a = maybe(() => this.unsigned.age);
let age_b = maybe(() => other.unsigned.age);
let ret;// = cmp(age_b, age_a);
//if(ret !== undefined)
// return ret;
// The origin server ts is used next to calculate the age
let ts_a = maybe(() => this.origin_server_ts);
let ts_b = maybe(() => other.origin_server_ts);
ret = cmp(ts_a, ts_b);
if(ret !== undefined)
return ret;
// Make an attempt to salvage any time data we actually have to compare
if((age_a || ts_a) && (age_b || ts_b))
{
let now = mc.now();
if(age_a && !ts_a)
ts_a = now - age_a;
if(age_b && !ts_b)
ts_b = now - age_b;
ret = cmp(ts_a, ts_b);
if(ret !== undefined)
return ret;
}
// Sort by room ID
ret = cmp(this.room_id, other.room_id);
if(ret !== undefined)
return ret;
// Sort by event ID
ret = cmp(this.event_id, other.event_id);
if(ret !== undefined)
return ret;
// Sort by sender
ret = cmp(this.sender, other.sender);
if(ret !== undefined)
return ret;
// Sort by content
ret = cmp(this.content, other.content);
if(ret !== undefined)
return ret;
// Final attempt
return cmp(this, other);
};