AffineTwo applet

Description

The AffineTwo applet is an extension of the Affine applet, which uses two custom classes, the GridArea class and the Lexer class to implement a simple rule-based text translation system. Text entered in the GridArea text component is translated forwards or backwards using two sets of mirror-image rewriting rules

For example if the forward set contained the rule a --> Ab, then the reverse set would contain the rule Ab --> a. This allows for "infinite undo" without caching intermediate states.

The AffineTwo applet differs from the Affine applet in the rule sets used by the lexers.

Instructions

Enter text in the GridArea, or use the default text. Select expand or revert, then press the apply button. Note: If the text is expanded past the bottom of the GridArea, it will over-write the top line, resulting in a loss of information.