Live programming environments aim to provide programmers (and sometimes audiences) with continuous feedback about a program’s dynamic behavior as it is being edited. The problem is that programming languages typically assign dynamic meaning only to programs that are complete, i.e. syntactically well-formed and free of type errors. Consequently, live feedback presented to the programmer exhibits temporal or perceptive gaps.
This paper confronts this “gap problem” from type-theoretic first principles by developing a dynamic semantics for incomplete functional programs, starting from the static semantics of Omar et al. [2017a]. We model incomplete functional programs as expressions with holes, with empty holes standing for missing expressions or types, and non-empty holes operating as membranes around static and dynamic type inconsistencies. Rather than aborting when evaluation encounters any of these holes as in some existing systems, evaluation proceeds around holes, tracking the closure around each hole instance as it flows through the remainder of the program. Editor services can use the information in these hole closures to help the programmer develop and confirm their mental model of the behavior of the complete portions of the program as they decide how to fill the remaining holes. Hole closures also enable a fill-and-resume operation that avoids the need to restart evaluation after edits that amount to hole filling. Formally, the semantics borrows machinery from both gradual type theory (which supplies the basis for handling unfilled type holes) and contextual modal type theory (which supplies a logical basis for hole closures), combining these and developing additional machinery necessary to continue evaluation past holes while maintaining type safety. We have mechanized the metatheory of the core calculus, called Hazelnut Live, using the Agda proof assistant.
We have also implemented these ideas into the Hazel programming environment. The implementation inserts holes automatically, following the Hazelnut edit action calculus of Omar et al. [2017a], to guarantee that every editor state has some (possibly incomplete) type. Taken together with this paper’s type safety property, the result is a proof-of-concept live programming environment where rich dynamic feedback is truly available without gaps, i.e. for every reachable editor state.
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|Type-Driven Gradual Security with ReferencesTOPLAS|
Matías Toro University of Chile, Ronald Garcia University of British Columbia, Éric Tanter University of Chile & Inria ParisDOI Media Attached File Attached
|Gradual Type Theory|
Max New Northeastern University, Dan Licata Wesleyan University, Amal Ahmed Northeastern University, USALink to publication DOI Media Attached File Attached
|Gradual Parametricity, RevisitedDistinguished Paper|
Matías Toro University of Chile, Elizabeth Labrada University of Chile, Éric Tanter University of Chile & Inria ParisLink to publication DOI Pre-print Media Attached File Attached
|Live Functional Programming with Typed Holes|
Cyrus Omar University of Chicago, Ian Voysey Carnegie Mellon University, Ravi Chugh University of Chicago, Matthew Hammer NoneLink to publication DOI Pre-print Media Attached File Attached