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oop.js
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oop.js
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/*
FILE ARCHIVED ON 10:34:49 May 30, 2016 AND RETRIEVED FROM THE
INTERNET ARCHIVE ON 15:51:22 Aug 21, 2016.
JAVASCRIPT APPENDED BY WAYBACK MACHINE, COPYRIGHT INTERNET ARCHIVE.
ALL OTHER CONTENT MAY ALSO BE PROTECTED BY COPYRIGHT (17 U.S.C.
SECTION 108(a)(3)).
*/
/**
* JavaScript Object Oriented Programming Framework
* Author: Joseph Huckaby
* Copyright (c) 2008 Joseph Huckaby.
* Released under the LGPL v3.0: /web/20160530103449/http://www.opensource.org/licenses/lgpl-3.0.html
**/
function _var_exists(name) {
// return true if var exists in "global" context, false otherwise
try {
eval('var foo = ' + name + ';');
}
catch (e) {
return false;
}
return true;
}
var Namespace = {
// simple namespace support for classes
create: function(path) {
// create namespace for class
var container = null;
while (path.match(/^(\w+)\.?/)) {
var key = RegExp.$1;
path = path.replace(/^(\w+)\.?/, "");
if (!container) {
if (!_var_exists(key)) eval('window.' + key + ' = {};');
eval('container = ' + key + ';');
}
else {
if (!container[key]) container[key] = {};
container = container[key];
}
}
},
prep: function(name) {
// prep namespace for new class
if (name.match(/^(.+)\.(\w+)$/)) {
var path = RegExp.$1;
name = RegExp.$2;
Namespace.create(path);
}
return { name: name };
}
};
var Class = {
// simple class factory
create: function(name, members) {
// generate new class with optional namespace
// support Prototype-style calling convention
if (!name && !members) {
return( function() {
if (this.initialize) this.initialize.apply(this, arguments);
else if (this.__construct) this.__construct.apply(this, arguments);
} );
}
assert(name, "Must pass name to Class.create");
if (!members) members = {};
members.__parent = null;
var ns = Namespace.prep(name);
// var container = ns.container;
var full_name = name;
name = ns.name;
members.__name = name;
if (!members.__construct) members.__construct = function() {};
// container[name] = members.__construct;
var obj = null;
eval( full_name + ' = obj = members.__construct;' );
var static_members = members.__static;
if (static_members) {
for (var key in static_members) {
obj[key] = static_members[key];
}
}
obj.prototype = members;
obj.extend = obj.subclass = function(name, members) {
Class.subclass( this, name, members );
};
obj.set = obj.add = function(members) {
Class.add( this, members );
};
},
subclass: function(parent, name, members) {
// subclass an existing class
assert(parent, "Must pass parent class to Class.subclass");
assert(name, "Must pass name to Class.subclass");
if (!members) members = {};
members.__name = name;
members.__parent = parent.prototype;
var ns = Namespace.prep(name);
// var container = ns.container;
var subname = ns.name;
var obj = null;
if (members.__construct) {
// explicit subclass constructor
// container[subname] = members.__construct;
eval( name + ' = obj = members.__construct;' );
}
else {
// inherit parent's constructor
var code = parent.toString();
var args = code.substring( code.indexOf("(")+1, code.indexOf(")") );
var inner_code = code.substring( code.indexOf("{")+1, code.lastIndexOf("}") );
eval('members.__construct = ' + name + ' = obj = function ('+args+') {'+inner_code+'};');
}
// inherit static from parent, if applicable
if (parent.prototype.__static) {
for (var key in parent.prototype.__static) {
obj[key] = parent.prototype.__static[key];
}
}
var static_members = members.__static;
if (static_members) {
for (var key in static_members) {
obj[key] = static_members[key];
}
}
obj.prototype = new parent();
// for (var key in parent.prototype) container[subname].prototype[key] = parent.prototype[key];
for (var key in members) obj.prototype[key] = members[key];
obj.extend = obj.subclass = function(name, members) {
Class.subclass( this, name, members );
};
obj.set = obj.add = function(members) {
Class.add( this, members );
};
},
add: function(obj, members) {
// add members to an existing class
for (var key in members) obj.prototype[key] = members[key];
},
require: function() {
// make sure classes are loaded
for (var idx = 0, len = arguments.length; idx < len; idx++) {
assert( !!eval('window.' + arguments[idx]) );
}
return true;
}
};
Class.extend = Class.subclass;
Class.set = Class.add;
if (!window.assert) window.assert = function(fact, msg) {
// very simple assert
if (!fact) return alert("ASSERT FAILED! " + msg);
return fact;
};