amber/js/boot.js

/* ====================================================================
   |
   |   Amber Smalltalk
   |   http://amber-lang.net
   |
   ======================================================================

   ======================================================================
   |
   | Copyright (c) 2010-2011
   | Nicolas Petton <petton.nicolas@gmail.com>
   |
   | Amber is released under the MIT license
   |
   | 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.
   |
   ==================================================================== */

/* Make sure that console is defined */

if(typeof console === "undefined") {
	this.console = {
		log: function() {},
		warn: function() {},
		info: function() {},
		debug: function() {},
		error: function() {}
	};
}

/* Array extensions */

Array.prototype.addElement = function(el) {
	if(typeof el === 'undefined') { return; }
	if(this.indexOf(el) == -1) {
        this.push(el);
    }
};

Array.prototype.removeElement = function(el) {
    var i = this.indexOf(el);
    if (i !== -1) { this.splice(i, 1); }
};


/* Smalltalk constructors definition */

function SmalltalkObject() {}
function SmalltalkBehavior() {}
function SmalltalkClass() {}
function SmalltalkMetaclass() {
	this.meta = true;
}
function SmalltalkPackage() {}
function SmalltalkMethod() {}
function SmalltalkNil() {}
function SmalltalkSymbol(string) {
	this.value = string;
}
function SmalltalkOrganizer() {
}

function SmalltalkPackageOrganizer() {
    this.elements = [];
}

function SmalltalkClassOrganizer() {
    this.elements = [];
}

function inherits(child, parent) {
	child.prototype = Object.create(parent.prototype, {
		constructor: { value: child,
			enumerable: false, configurable: true, writable: true }
	});
}

inherits(SmalltalkBehavior, SmalltalkObject);
inherits(SmalltalkClass, SmalltalkBehavior);
inherits(SmalltalkMetaclass, SmalltalkBehavior);
inherits(SmalltalkNil, SmalltalkObject);
inherits(SmalltalkMethod, SmalltalkObject);
inherits(SmalltalkPackage, SmalltalkObject);
inherits(SmalltalkOrganizer, SmalltalkObject);
inherits(SmalltalkPackageOrganizer, SmalltalkOrganizer);
inherits(SmalltalkClassOrganizer, SmalltalkOrganizer);


function Smalltalk() {

	var st = this;

	/* This is the current call context object. While it is publicly available,
	   Use smalltalk.getThisContext() instead which will answer a safe copy of
	   the current context */

	st.thisContext = undefined;

	/* List of all reserved words in JavaScript. They may not be used as variables
	   in Smalltalk. */

	// list of reserved JavaScript keywords as of
	//   http://es5.github.com/#x7.6.1.1
	// and
	//   http://people.mozilla.org/~jorendorff/es6-draft.html#sec-7.6.1
	st.reservedWords = ['break', 'case', 'catch', 'continue', 'debugger',
		'default', 'delete', 'do', 'else', 'finally', 'for', 'function',
		'if', 'in', 'instanceof', 'new', 'return', 'switch', 'this', 'throw',
		'try', 'typeof', 'var', 'void', 'while', 'with',
		// ES5: future use: http://es5.github.com/#x7.6.1.2
		'class', 'const', 'enum', 'export', 'extends', 'import', 'super',
		// ES5: future use in strict mode
		'implements', 'interface', 'let', 'package', 'private', 'protected',
		'public', 'static', 'yield'];

    var initialized = false;

    /* Smalltalk classes */

    var classes = [];
    var wrappedClasses = [];

    /* Method not implemented handlers */

	var dnu = {
		methods: [],
		selectors: [],

		get: function (string) {
			var index = this.selectors.indexOf(string);
			if(index !== -1) {
				return this.methods[index];
			}
			this.selectors.push(string);
			var selector = st.selector(string);
			var method = {jsSelector: selector, fn: this.createHandler(selector)};
			this.methods.push(method);
			return method;
		},

		/* Dnu handler method */

		createHandler: function (selector) {
			return function () {
				var args = Array.prototype.slice.call(arguments);
				return messageNotUnderstood(this, selector, args);
			};
		}
	};

	/* The symbol table ensures symbol unicity */

	var symbolTable = {};
	st.symbolFor = function(string) {
		if(symbolTable[string] === undefined) {
			symbolTable[string] = new SmalltalkSymbol(string);
		}

		return symbolTable[string];
	};

	/* Unique ID number generator */

	var oid = 0;
	st.nextId = function() {
		oid += 1;
		return oid;
	};

	/* We hold all Packages in a separate Object */

	st.packages = {};

	/* Smalltalk package creation. To add a Package, use smalltalk.addPackage() */

	function pkg(spec) {
		var that = new SmalltalkPackage();
		that.pkgName = spec.pkgName;
        that.organization = new SmalltalkPackageOrganizer();
		that.properties = spec.properties || {};
		return that;
	}

	/* Smalltalk class creation. A class is an instance of an automatically
	   created metaclass object. Newly created classes (not their metaclass) 
	   should be added to the smalltalk object, see smalltalk.addClass().
	   Superclass linking is *not* handled here, see smalltalk.init()  */

	function klass(spec) {
		spec = spec || {};
		var meta = metaclass(spec);
		var that = meta.instanceClass;
		that.fn = spec.fn || function() {};
		setupClass(that, spec);

        that.className = spec.className;
        that.wrapped   = spec.wrapped || false;
		meta.className = spec.className + ' class';
		if(spec.superclass) {
			that.superclass = spec.superclass;
			meta.superclass = spec.superclass.klass;
		}
		return that;
	}

	function metaclass(spec) {
		spec = spec || {};
		var that = new SmalltalkMetaclass();
		inherits(
			that.fn = function() {},
			spec.superclass ? spec.superclass.klass.fn : SmalltalkClass
		);
		that.instanceClass = new that.fn();
        setupClass(that);
		return that;
	}

	function setupClass(klass, spec) {
        spec = spec || {};
		klass.iVarNames = spec.iVarNames || [];
		klass.pkg = spec.pkg;

        Object.defineProperty(klass, "toString", {
			value: function() { return 'Smalltalk ' + this.className; },
            enumerable:false, configurable: true, writable: false
		});

		klass.organization          = new SmalltalkClassOrganizer();
        klass.organization.theClass = klass;

		Object.defineProperty(klass, "methods", {
			value: {},
			enumerable: false, configurable: true, writable: true
		});
		wireKlass(klass);
	}

	/* Smalltalk method object. To add a method to a class,
	   use smalltalk.addMethod() */

	st.method = function(spec) {
		var that = new SmalltalkMethod();
		that.selector          = spec.selector;
		that.jsSelector        = spec.jsSelector;
		that.args              = spec.args || {};
		that.category          = spec.category;
		that.source            = spec.source;
		that.messageSends      = spec.messageSends || [];
		that.referencedClasses = spec.referencedClasses || [];
		that.fn                = spec.fn;
		return that;
	};

	/* Initialize a class in its class hierarchy. Handle both classes and
	   metaclasses. */

	st.init = function(klass) {
		st.initClass(klass);
		if(klass.klass && !klass.meta) {
			st.initClass(klass.klass);
		}
	};

    st.initClass = function(klass) {
        if(klass.wrapped) {
            copySuperclass(klass);
        }
        else {
            installSuperclass(klass);
        }

        if(klass === st.Object || klass.wrapped) {
            installDnuHandlers(klass);
        }
    };

	function wireKlass(klass) {
		Object.defineProperty(klass.fn.prototype, "klass", {
			value: klass,
			enumerable: false, configurable: true, writable: true
		});
	}

	function installSuperclass(klass) {
        // only if the klass has not been initialized yet.
		if(klass.fn.prototype._yourself) { return; }

		if(klass.superclass && klass.superclass !== nil) {
            inherits(klass.fn, klass.superclass.fn);
			wireKlass(klass);
			reinstallMethods(klass);
        }
	}

	function copySuperclass(klass, superclass) {
		for (superclass = superclass || klass.superclass;
			 superclass && superclass !== nil;
			 superclass = superclass.superclass) {
			for (var keys = Object.keys(superclass.methods), i = 0; i < keys.length; i++) {
				installMethodIfAbsent(superclass.methods[keys[i]], klass);
			}
		}
	}

	function installMethod(method, klass) {
        Object.defineProperty(klass.fn.prototype, method.jsSelector, {
			value: method.fn,
			enumerable: false, configurable: true, writable: true
		});
	}

	function installMethodIfAbsent(method, klass) {
		if(!klass.fn.prototype[method.jsSelector]) {
			installMethod(method, klass);
		}
	}

	function reinstallMethods(klass) {
        for(var keys = Object.keys(klass.methods), i=0; i<keys.length; i++) {
            installMethod(klass.methods[keys[i]], klass);
		}
	}

	function installDnuHandlers(klass) {
		var m = dnu.methods;
        for(var i=0; i<m.length; i++) {
			installMethodIfAbsent(m[i], klass);
        }
	}

	function installNewDnuHandler(newHandler) {
		installMethodIfAbsent(newHandler, st.Object);
		for(var i = 0; i < wrappedClasses.length; i++) {
			installMethodIfAbsent(newHandler, wrappedClasses[i]);
		}
	}

	/* Answer all registered Packages as Array */
    // TODO: Remove this hack

	st.packages.all = function() {
		var packages = [];
		for(var i in st.packages) {
			if(!st.packages.hasOwnProperty(i) || typeof(st.packages[i]) === "function") continue;
			packages.push(st.packages[i]);
		}
		return packages
	};

	/* Answer all registered Smalltalk classes */
    //TODO: remove the function and make smalltalk.classes an array

	st.classes = function() {
		return classes;
	};

    st.wrappedClasses = function() {
        return wrappedClasses;
    };

	/* Answer the direct subclasses of klass. */

	st.subclasses = function(klass) {
		var subclasses = [];
		var classes = st.classes();
		for(var i=0; i < classes.length; i++) {
			var c = classes[i];
			if(c.fn) {
				//Classes
				if(c.superclass === klass) {
					subclasses.push(c);
				}
				c = c.klass;
				//Metaclasses
				if(c && c.superclass === klass) {
					subclasses.push(c);
				}
			}
		}
		return subclasses;
	};

	/* Create a new class wrapping a JavaScript constructor, and add it to the
	   global smalltalk object. Package is lazily created if it does not exist with given name. */

	st.wrapClassName = function(className, pkgName, fn, superclass, wrapped) {
        if(wrapped !== false) {
            wrapped = true;
        }
		var pkg = st.addPackage(pkgName);
		st[className] = klass({
			className:  className,
			superclass: superclass,
			pkg:        pkg,
			fn:         fn,
            wrapped:    wrapped
		});

        classes.addElement(st[className]);
		if(wrapped) {wrappedClasses.addElement(st[className])}
		pkg.organization.elements.addElement(st[className]);
	};

	/* Create an alias for an existing class */

	st.alias = function(klass, alias) {
		st[alias] = klass;
	};

	/* Add a package to the smalltalk.packages object, creating a new one if needed.
	   If pkgName is null or empty we return nil, which is an allowed package for a class.
	   If package already exists we still update the properties of it. */

	st.addPackage = function(pkgName, properties) {
		if(!pkgName) {return nil;}
		if(!(st.packages[pkgName])) {
			st.packages[pkgName] = pkg({
				pkgName: pkgName,
				properties: properties
			});
		} else {
			if(properties) {
				st.packages[pkgName].properties = properties;
			}
		}
		return st.packages[pkgName];
	};

	/* Add a class to the smalltalk object, creating a new one if needed.
	   A Package is lazily created if it does not exist with given name. */

	st.addClass = function(className, superclass, iVarNames, pkgName) {
		var pkg = st.addPackage(pkgName);
        if (superclass == nil) { superclass = null; }
		if(st[className] && st[className].superclass == superclass) {
			st[className].superclass = superclass;
			st[className].iVarNames = iVarNames;
			st[className].pkg = pkg || st[className].pkg;
		} else {
            if(st[className]) {
                st.removeClass(st[className]);
			}
			st[className] = klass({
				className: className,
				superclass: superclass,
				pkg: pkg,
				iVarNames: iVarNames
			});
		}

        classes.addElement(st[className]);
        pkg.organization.elements.addElement(st[className]);
	};

    st.removeClass = function(klass) {
        klass.pkg.organization.elements.removeElement(klass);
        classes.removeElement(klass);
        delete st[klass.className];
    };

	/* 
     * Add/remove a method to/from a class 
     */

	st.addMethod = function(jsSelector, method, klass) {
		method.jsSelector = jsSelector;
		installMethod(method, klass);
		klass.methods[method.selector] = method;
		method.methodClass = klass;

        // During the bootstrap, #addCompiledMethod is not used.
        // Therefore we populate the organizer here too
        klass.organization.elements.addElement(method.category);

        for(var i=0; i<method.messageSends.length; i++) {
            var dnuHandler = dnu.get(method.messageSends[i]);
            if(initialized) {
                installNewDnuHandler(dnuHandler);
			}
		}
	};

    st.removeMethod = function(method) {
        var protocol = method.category;
        var klass = method.methodClass;

        delete klass.fn.prototype[st.selector(method.selector)];
	    delete klass.methods[method.selector];

		var selectors = Object.keys(klass.methods);
        // Do *not* delete protocols from here.
        // This is handled by #removeCompiledMethod
    };

	/* Handles unhandled errors during message sends */
    // simply send the message and handle #dnu:

	st.send = function(receiver, selector, args, klass) {
		var method;
		if(receiver == null) {
			receiver = nil;
		}
		method = klass ? klass.fn.prototype[selector] : receiver.klass && receiver[selector];
		if(method) {
            return method.apply(receiver, args);
		} else {
			return messageNotUnderstood(receiver, selector, args);
		}
	}

	st.withContext = function(worker, setup) {
		if(st.thisContext) {
            st.thisContext.pc++;
			return inContext(worker, setup);
		} else {
			try {return inContext(worker, setup)}
			catch(error) {
				if(error.smalltalkError) {
					handleError(error);
                } else {
                    var errorWrapper = st.JavaScriptException._on_(error);
                    try {errorWrapper._signal()} catch(ex) {}
                    errorWrapper._context_(st.getThisContext());
                    handleError(errorWrapper);
                }
				// Reset the context stack in any case
				st.thisContext = undefined;
                // Throw the exception anyway, as we want to stop
                // the execution to avoid infinite loops
				throw error;
			}
		}
	};

	function inContext(worker, setup) {
		var context = pushContext(setup);
		var result = worker(context);
		popContext(context);
		return result;
	}

	/* Handles Smalltalk errors. Triggers the registered ErrorHandler
	   (See the Smalltalk class ErrorHandler and its subclasses */

	function handleError(error) {
        st.ErrorHandler._current()._handleError_(error);
	}

	/* Handles #dnu: *and* JavaScript method calls.
	   if the receiver has no klass, we consider it a JS object (outside of the
	   Amber system). Else assume that the receiver understands #doesNotUnderstand: */

	function messageNotUnderstood(receiver, selector, args) {
		/* Handles JS method calls. */
		if(receiver.klass === undefined || receiver.allowJavaScriptCalls) {
			return callJavaScriptMethod(receiver, selector, args);
		}

		/* Handles not understood messages. Also see the Amber counter-part
		   Object>>doesNotUnderstand: */

		return receiver._doesNotUnderstand_(
			st.Message._new()
				._selector_(st.convertSelector(selector))
				._arguments_(args)
		);
	}

	/* Call a method of a JS object, or answer a property if it exists.
	   Else try wrapping a JSObjectProxy around the receiver.

       If the object property is a function, then call it, except if it starts with
       an uppercase character (we probably want to answer the function itself in this
       case and send it #new from Amber).

	   Converts keyword-based selectors by using the first
	   keyword only, but keeping all message arguments.

	   Example:
	   "self do: aBlock with: anObject" -> "self.do(aBlock, anObject)" */

	function callJavaScriptMethod(receiver, selector, args) {
		var jsSelector = selector._asJavaScriptSelector();
		var jsProperty = receiver[jsSelector];
		if(typeof jsProperty === "function" && !/^[A-Z]/.test(jsSelector)) {
			return jsProperty.apply(receiver, args);
		} else if(jsProperty !== undefined) {
			if(args[0]) {
				receiver[jsSelector] = args[0];
				return nil;
			} else {
				return jsProperty;
			}
		}

		return st.send(st.JSObjectProxy._on_(receiver), selector, args);
	}

	/* Handle thisContext pseudo variable */

	st.getThisContext = function() {
        if(st.thisContext) {
		    st.thisContext.init();
            return st.thisContext;
        } else {
            return nil;
        }
	};

	function pushContext(setup) {
		return st.thisContext = new SmalltalkMethodContext(smalltalk.thisContext, setup);
	}

	function popContext(context) {
		st.thisContext = context.homeContext;
	}

	/* Convert a Smalltalk selector into a JS selector */

    st.selector = function(string) {
        var selector = '_' + string;
	    selector = selector.replace(/:/g, '_');
	    selector = selector.replace(/[\&]/g, '_and');
	    selector = selector.replace(/[\|]/g, '_or');
	    selector = selector.replace(/[+]/g, '_plus');
	    selector = selector.replace(/-/g, '_minus');
	    selector = selector.replace(/[*]/g ,'_star');
	    selector = selector.replace(/[\/]/g ,'_slash');
	    selector = selector.replace(/[\\]/g ,'_backslash');
	    selector = selector.replace(/[\~]/g ,'_tild');
	    selector = selector.replace(/>/g ,'_gt');
	    selector = selector.replace(/</g ,'_lt');
	    selector = selector.replace(/=/g ,'_eq');
	    selector = selector.replace(/,/g ,'_comma');
	    selector = selector.replace(/[@]/g ,'_at');
        return selector
    };

	/* Convert a string to a valid smalltalk selector.
	   if you modify the following functions, also change String>>asSelector
	   accordingly */

	st.convertSelector = function(selector) {
		if(selector.match(/__/)) {
			return convertBinarySelector(selector);
		} else {
			return convertKeywordSelector(selector);
		}
	};

	function convertKeywordSelector(selector) {
		return selector.replace(/^_/, '').replace(/_/g, ':');
	}

	function convertBinarySelector(selector) {
		return selector
			.replace(/^_/, '')
			.replace(/_and/g, '&')
			.replace(/_or/g, '|')
			.replace(/_plus/g, '+')
			.replace(/_minus/g, '-')
			.replace(/_star/g, '*')
			.replace(/_slash/g, '/')
			.replace(/_backslash/g, '\\')
			.replace(/_tild/g, '~')
			.replace(/_gt/g, '>')
			.replace(/_lt/g, '<')
			.replace(/_eq/g, '=')
			.replace(/_comma/g, ',')
			.replace(/_at/g, '@')
	}

	/* Converts a JavaScript object to valid Smalltalk Object */
	st.readJSObject = function(js) {
		var object = js;
		var readObject = (js.constructor === Object);
		var readArray = (js.constructor === Array);

		if(readObject) {
			object = st.Dictionary._new();
		}
		for(var i in js) {
			if(readObject) {
				object._at_put_(i, st.readJSObject(js[i]));
			}
			if(readArray) {
				object[i] = st.readJSObject(js[i]);
			}
		}
		return object;
	};

    /* Boolean assertion */
    st.assert = function(shouldBeBoolean) {
        if ((undefined !== shouldBeBoolean) && (shouldBeBoolean.klass === smalltalk.Boolean)) {
            return shouldBeBoolean == true;
        } else {
            smalltalk.NonBooleanReceiver._new()._object_(shouldBeBoolean)._signal();
        }
    };

    /* Smalltalk initialization. Called on page load */

    st.initialize = function() {
		if(initialized) { return; }

		classes.forEach(function(klass) {
            st.init(klass);
        });
        classes.forEach(function(klass) {
            klass._initialize();
        });

        initialized = true;
    };
}

inherits(Smalltalk, SmalltalkObject);

function SmalltalkMethodContext(home, setup) {
	this.homeContext = home;
    this.setup       = setup || function() {};
    this.pc          = 0;
}

// Fallbacks
SmalltalkMethodContext.prototype.locals = {};
SmalltalkMethodContext.prototype.receiver = null;
SmalltalkMethodContext.prototype.selector = null;
SmalltalkMethodContext.prototype.lookupClass = null;

inherits(SmalltalkMethodContext, SmalltalkObject);

SmalltalkMethodContext.prototype.fill = function(receiver, selector, locals, lookupClass) {
    this.receiver    = receiver;
    this.selector    = selector;
    this.locals      = locals || {};
    this.lookupClass = lookupClass;
};

SmalltalkMethodContext.prototype.fillBlock = function(locals, ctx) {
    this.locals        = locals || {};
    this.methodContext = ctx;
};

SmalltalkMethodContext.prototype.init = function() {
	var home = this.homeContext;
	if(home) {home = home.init()}

    this.setup(this);
};

SmalltalkMethodContext.prototype.method = function() {
    var method;
    var lookup = this.lookupClass || this.receiver.klass;
    while(!method && lookup) {
        method = lookup.methods[smalltalk.convertSelector(this.selector)];
        lookup = lookup.superclass
    }
    return method;
};

// TODO: this is just wrong :)
SmalltalkMethodContext.prototype.resume = function() {
    //Brutally set the receiver as thisContext, then re-enter the function
    smalltalk.thisContext = this;
    return this.method.apply(receiver, temps);
};

/* Global Smalltalk objects. */

var nil = new SmalltalkNil();
var smalltalk = new Smalltalk();

if(this.jQuery) {
	this.jQuery.allowJavaScriptCalls = true;
}

/*
 * Answer the smalltalk representation of o.
 * Used in message sends
 */

var _st = function(o) {
	if(o == null) {return nil}
	if(o.klass) {return o}
	return smalltalk.JSObjectProxy._on_(o);
}; 


/***************************************** BOOTSTRAP ******************************************/

smalltalk.wrapClassName("Object", "Kernel-Objects", SmalltalkObject, undefined, false);
smalltalk.wrapClassName("Behavior", "Kernel-Classes", SmalltalkBehavior, smalltalk.Object, false);
smalltalk.wrapClassName("Metaclass", "Kernel-Classes", SmalltalkMetaclass, smalltalk.Behavior, false);
smalltalk.wrapClassName("Class", "Kernel-Classes", SmalltalkClass, smalltalk.Behavior, false);

smalltalk.Object.klass.superclass = smalltalk.Class;


smalltalk.wrapClassName("Smalltalk", "Kernel-Objects", Smalltalk, smalltalk.Object, false);
smalltalk.wrapClassName("Package", "Kernel-Objects", SmalltalkPackage, smalltalk.Object, false);
smalltalk.wrapClassName("CompiledMethod", "Kernel-Methods", SmalltalkMethod, smalltalk.Object, false);
smalltalk.wrapClassName("Organizer", "Kernel-Objects", SmalltalkOrganizer, smalltalk.Object, false);
smalltalk.wrapClassName("PackageOrganizer", "Kernel-Objects", SmalltalkPackageOrganizer, smalltalk.Organizer, false);
smalltalk.wrapClassName("ClassOrganizer", "Kernel-Objects", SmalltalkClassOrganizer, smalltalk.Organizer, false);


smalltalk.wrapClassName("Number", "Kernel", Number, smalltalk.Object);
smalltalk.wrapClassName("BlockClosure", "Kernel", Function, smalltalk.Object);
smalltalk.wrapClassName("Boolean", "Kernel", Boolean, smalltalk.Object);
smalltalk.wrapClassName("Date", "Kernel", Date, smalltalk.Object);
smalltalk.wrapClassName("UndefinedObject", "Kernel", SmalltalkNil, smalltalk.Object, false);

smalltalk.addClass("Collection", smalltalk.Object, null, "Kernel");
smalltalk.addClass("IndexableCollection", smalltalk.Collection, null, "Kernel");
smalltalk.addClass("SequenceableCollection", smalltalk.IndexableCollection, null, "Kernel");
smalltalk.addClass("CharacterArray", smalltalk.SequenceableCollection, null, "Kernel");
smalltalk.wrapClassName("String", "Kernel", String, smalltalk.CharacterArray);
smalltalk.wrapClassName("Symbol", "Kernel", SmalltalkSymbol, smalltalk.CharacterArray, false);
smalltalk.wrapClassName("Array", "Kernel", Array, smalltalk.SequenceableCollection);
smalltalk.wrapClassName("RegularExpression", "Kernel", RegExp, smalltalk.Object);

smalltalk.wrapClassName("Error", "Kernel", Error, smalltalk.Object);
smalltalk.wrapClassName("MethodContext", "Kernel", SmalltalkMethodContext, smalltalk.Object, false);

/* Alias definitions */

smalltalk.alias(smalltalk.Array, "OrderedCollection");
smalltalk.alias(smalltalk.Date, "Time");