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Documents authored by Chugh, Ravi

Document
DOI: 10.4230/LIPIcs.ECOOP.2022.16
Maniposynth: Bimodal Tangible Functional Programming

Authors: Brian Hempel and Ravi Chugh

Published in: LIPIcs, Volume 222, 36th European Conference on Object-Oriented Programming (ECOOP 2022)

Abstract
Traditionally, writing code is a non-graphical, abstract, and linear process. Not everyone is comfortable with this way of thinking at all times. Can programming be transformed into a graphical, concrete, non-linear activity? While nodes-and-wires [Sutherland, 1966] and blocks-based [Begel, 1996] programming environments do leverage graphical direct manipulation, users perform their manipulations on abstract syntax tree elements, which are still abstract. Is it possible to be more concrete - could users instead directly manipulate live program values to create their program? We present a system, Maniposynth, that reimagines functional programming as a non-linear workflow where program expressions are spread on a 2D canvas. The live results of those expressions are continuously displayed and available for direct manipulation. The non-linear canvas liberates users to work out-of-order, and the live values can be interacted with via drag-and-drop. Incomplete programs are gracefully handled via hole expressions, which allow Maniposynth to offer program synthesis. Throughout the workflow, the program is valid OCaml code which the user may inspect and edit in their preferred text editor at any time. With Maniposynth’s direct manipulation features, we created 38 programs drawn from a functional data structures course. We additionally hired two professional OCaml developers to implement a subset of these programs. We report on these experiences and discuss to what degree Maniposynth meets its goals of providing a non-linear, concrete, graphical programming workflow.
Cite as

Brian Hempel and Ravi Chugh. Maniposynth: Bimodal Tangible Functional Programming. In 36th European Conference on Object-Oriented Programming (ECOOP 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 222, pp. 16:1-16:29, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)

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@InProceedings{hempel_et_al:LIPIcs.ECOOP.2022.16,
  author =	{Hempel, Brian and Chugh, Ravi},
  title =	{{Maniposynth: Bimodal Tangible Functional Programming}},
  booktitle =	{36th European Conference on Object-Oriented Programming (ECOOP 2022)},
  pages =	{16:1--16:29},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-225-9},
  ISSN =	{1868-8969},
  year =	{2022},
  volume =	{222},
  editor =	{Ali, Karim and Vitek, Jan},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2022.16},
  URN =		{urn:nbn:de:0030-drops-162445},
  doi =		{10.4230/LIPIcs.ECOOP.2022.16},
  annote =	{Keywords: direct manipulation, tangible programming, programming user interfaces}
}
Document
DOI: 10.4230/OASIcs.PLATEAU.2019.3
Type-Directed Program Transformations for the Working Functional Programmer

Authors: Justin Lubin and Ravi Chugh

Published in: OASIcs, Volume 76, 10th Workshop on Evaluation and Usability of Programming Languages and Tools (PLATEAU 2019)

Abstract
We present preliminary research on Deuce+, a set of tools integrating plain text editing with structural manipulation that brings the power of expressive and extensible type-directed program transformations to everyday, working programmers without a background in computer science or mathematical theory. Deuce+ comprises three components: (i) a novel set of type-directed program transformations, (ii) support for syntax constraints for specifying "code style sheets" as a means of flexibly ensuring the consistency of both the concrete and abstract syntax of the output of program transformations, and (iii) a domain-specific language for specifying program transformations that can operate at a high level on the abstract (and/or concrete) syntax tree of a program and interface with syntax constraints to expose end-user options and alleviate tedious and potentially mutually inconsistent style choices. Currently, Deuce+ is in the design phase of development, and discovering the right usability choices for the system is of the highest priority.
Cite as

Justin Lubin and Ravi Chugh. Type-Directed Program Transformations for the Working Functional Programmer. In 10th Workshop on Evaluation and Usability of Programming Languages and Tools (PLATEAU 2019). Open Access Series in Informatics (OASIcs), Volume 76, pp. 3:1-3:12, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020)

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@InProceedings{lubin_et_al:OASIcs.PLATEAU.2019.3,
  author =	{Lubin, Justin and Chugh, Ravi},
  title =	{{Type-Directed Program Transformations for the Working Functional Programmer}},
  booktitle =	{10th Workshop on Evaluation and Usability of Programming Languages and Tools (PLATEAU 2019)},
  pages =	{3:1--3:12},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-95977-135-1},
  ISSN =	{2190-6807},
  year =	{2020},
  volume =	{76},
  editor =	{Chasins, Sarah and Glassman, Elena L. and Sunshine, Joshua},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.PLATEAU.2019.3},
  URN =		{urn:nbn:de:0030-drops-119579},
  doi =		{10.4230/OASIcs.PLATEAU.2019.3},
  annote =	{Keywords: program transformations, structured editing, refactoring, code formatting}
}
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