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Custom Scripting Language Interpreter (BOOSE)

A scripting language interpreter built in C# on top of a fixed abstract DLL interface, with a Windows Forms front end for writing and running scripts against a bitmap canvas.

What it does

Type commands into a text box and the interpreter parses and executes them, drawing shapes and text onto a canvas in real time. Supports typed variables (int, real, boolean), arrays, while loops, if statements, and drawing commands like moveto, drawto, circle, rect, and pen.

The constraint

Built against a precompiled DLL provided by the module tutor, defining a fixed set of interfaces that couldn't be modified. Every command had to be implemented to conform to that contract, including working around restriction counters the DLL enforced.

Architecture

  • Factory pattern — AppCommandFactory returns the correct command class for each keyword
  • Canvas — AppCanvas implements ICanvas, handling all drawing operations
  • Parser — AppParser extends the base Parser, removing the DLL's line count restrictions
  • BooseReset — resets static counters to avoid hitting restriction limits inherited from the DLL

Testing

MSTest suite covering core canvas operations (movement, drawing, multi-line programs).

Documentation

Full XML doc comments across all classes, with HTML API reference generated via DocFX.

Stack

C# · Windows Forms · MSTest · DocFX