1	SmallScript Language System Native Host Service Integration Modular Applications, Services and Components David Simmons Sean Simmons SmallScript LLC
2	Our Plan Today We have roughly 2.5 hours We will take a break from 10:15 to 10:45 We have the 4.0.0.1620 Technology Preview CD Form PCMCIA Memory Disk Card And it is available from the www.smallscript.org site
3	Our Plan Today [2] Distribute CD’s at the end of the talk Discuss what the SmallScript Dynamic Language System, and what it is not. Talk about the AOS Platform Talk about the .NET Platform
4	Our Plan Today [3] Technology Preview SDK Deployment Elements [Installer] Installed Elements and Organization Standard Tools What you can expect from us now and in the near term future IDE Facilities; SmallScript.AOS and VBScript.AOS Languages VisualStudio.NET and the AOS.NET.Enabler SmallScript SDK CHM File Language Guide Framework Overview Tutorials SmallScript Web Community Portal What is: free?; commercial?; the business focus?
5	Our Plan Today [4] Technical Foundations What is an object? What is a class? What is a script? What is a module, DLL, assembly, etc What is the process to go from source to executable code? Interactive Script Compilation and Execution Classic Build Processes to Produce Deployment Binaries
6	Our Plan Today [5] Languages and Tools Introduction Source forms and Management File Based, Repository Based Creating a: Application; DLL Interactive Scripting and Classic Smalltalk Browsing The Language: AML, SmallScript Classes, Methods, Enums, Evals Namespaces, Fields, Imports, Implements Signature, Control Flow, Keywords, Features
7	Our Plan Today [6] Discussion and Overview of the Frameworks Language Infrastructure [MOP], Numerics, Collections, Specifiers, GUI Elements, other .NET Frameworks
8	Our Plan Today [7] The GUI Facilities and Browser Toolkit Simple Window; Menu, Toolbars, Events Graphics; Canvases; Media Objects Browser Toolkit Elements Goals Views and Models Extending Context Nodes; Leaf Entities; Value Presentations
9	Our Plan Today [8] Audience Driven Exploration Language Features Framework Features Solution Examples Suitable Tasks and Best Approaches Cross-dialect Portability Microsoft’s .NET and WebServices SmallScript and You
10	SmallScript Language System Darwinian Evolution of Smalltalk SmallScript: The Language Superset of classic Smalltalk with rich integration of static, dynamic and scripting language features Based on a decade of commercial Smalltalk Implementation Experience Agents Object System [VM Option #1] Platform 4^th Generation Dynamic Language Runtime First generation developed in 1991 Focus on Simplification through Unification Pluggable JITTER Architecture, Unified Object Model, Flexible Deployment Based on Mainstream Industry Standards Microsoft’s .NET [VM Option #2] Platform AOS.ON.NET Enabler AOS.TO.NET JIT Compiler for generating standard .NET managed code components
11	SmallScript Language System Support Mainstream Component and Application Deployment Technologies Shared Library Modularization Binary Deployment Standards Emerging Metadata Standards Rebuild Smalltalk from the ground up modularized lightweight scale from scripting to complex systems Extend the language to support scripting to support familiar imperative style and constructs to support optional typing Support Mainstream File Based Development Enable use with popular IDE tools and processes Extend the language to provide transparent FFI to provide intrinsic component facilities Augment the language to provide declarative facilities to provide repository facilities compatible with Binary Deployment Standards such as COFF/ELF Provide a Common Dynamic Language Architecture Support all classic Smalltalk features Support all current Scripting Language Features Support all current Lisp/Scheme Language Features
12	Key Object System Features Lightweight, Modular, Multi-threaded Architecture Rich Dynamic Object Model and MOP services Extensible Binding Predicates Optional Typing for Marshalling and Multi-methods Class and Instance Specific Structure and Behavior Modules distinct from Namespaces Interfaces as First Class Mixin and Aggregation Entities Selector Namespaces to manage change and dynamic privileges Facilities to Manage Contextual Relativity Weaving & Entanglement Sandboxes
13	What is an Object?
14	What is a Class? Unit of Behavior Inheritance of Implementation SI via a single Superclass MI through Aspects [Interfaces and Mixins] Methods for The Class A Function Methods for Instances A Member Function Unit of Metadata Mutable Repository Arbitrarily extensible Reflectively queryable Unit of Structure Constructor of Objects Single Inheritance of Layout of Fields Reference Types (Slots) Value Types (Bits/Structs) Intrinsic Aggregation and MI Composition through Interfaces Unit of Privilege/Scope Namespace Container of shared fields (variables) Scope for Message Selectors Inheritance of Scope SI via a single Superscope MI through Importing
15	What is a Module? Units of packaging and deployment Repositories of Code and Media Manifests of Version and Security Data Implemented Using Mainstream Standards COFF, PE, ELF, CodeFragments Shared Libraries, DLL’s, EXE’s, OCX, CPL, etc
16	What is a Script? Independent Unit Executable Source Easily created with basic text editing tools or automatic generation Easily modified with basic text editing tools Text Based Files and Chunks Well suited for providing small ad-hoc operational chunks within some larger application or system context By and for Human Beings Is for humans to communicate structure and commands to software systems Not for software to talk to other software Substitutable for compiled binary executable software formats Acceptable performance for repeated execution and stream based call chaining Well suited for use in stdio streaming and text processing through program piping
17	SmallScript in Action Hello World: The Script [stdout cr << ‘Hello World’]
18	SmallScript in Action Hello World: The EXE
19	What is the process to go from source to executable code? Interactive Script Compilation and Execution Classic Build Processes to Produce Deployment Binaries
20	AML and SmallScript AML is XML with flexible syntax AOS Object Model Declarations SmallScript is AML+Smalltalk Principally when we talk about SmallScript we actually mean the body of an AML method token. See Example…
21	Frameworks Language Infrastructure [MOP], Numerics, Collections, Specifiers, GUI Elements, other .NET Frameworks
22	The GUI Facilities and Browser Toolkit Simple Window; Menu, Toolbars, Events Graphics; Canvases; Media Objects Browser Toolkit Elements Goals Views and Models Extending Context Nodes; Leaf Entities; Value Presentations
23	SmallScript in Action Interfaces: Collection Example Thread Safety Around Behavior
24	SmallScript in Action Selector Namespaces
25	SmallScript in Action Typing: Callbacks and FFI
26	SmallScript in Action Multimethods, Closures Numerics Double Dispatch Multiple Arguments… Type Composition Algebra Binding Predicates Parameterized Types
27	SmallScript in Action Sandboxes