Fructure

is a prototype for an extensible structured editing engine.

In structured editing, core edit actions reflect the extended selves of the objects you're bringing to life (grammatical programs with semantic properties), as opposed to the shape of their serialization (text files). Editing abstractions like cursors and code-folding are reimagined as syntactic scaffolding in a meta-grammar of syntactic affordances. Fructure lets language providers specify syntactic forms and semantic refactorings as production and transformation rules in a tiny term-rewriting DSL. Lessening reliance on after-the-fact correction or ad-hoc autocompletion, program creation consists rather of a guided search in the space of valid programs. Over the hood, my emphasis is on visual and kinetic appeal; creating a fun, fluid editing process with an eye to discoverability.