Interactive preview · flexr 1.0
See the decision, not just the token.
Choose a fixture, edit its input, and inspect which rule wins at each position. This preview is static and fixture-backed: it does not execute arbitrary Ruby in your browser. Use the repository examples and CLI for full runtime and generation behavior.
Safe boundary: this page sends no source or input to a server. Arbitrary actions and
--eval are intentionally unavailable here.
Specification fixtureread-only model
Inputedit, then run
Tokensoutput
Run a fixture to see its token stream.
Match decisionswhy the winner won
Each input position will show its accepted candidates and the winning rule.