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  • ROTOR : A Tool for Renaming Values in OCaml's Module System
  • ROTOR : A Tool for Renaming Values in OCaml's Module System
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  • 2019-05-28
  • 2019-05-28
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  • The functional programming paradigm presents its own unique challenges to refactoring. For the OCaml language in particular, the expressiveness of its module system makes this a highly non-trivial task and there is currently no automated support for large-scale refactoring in the OCaml language. We present Rotor, a tool for automatically renaming top-level value definitions in OCaml's module system. To compute the effect of renaming, Rotor relies on a novel concept which we call a value extension. This is a collection of related declarations in a program that must all be renamed at once. In practice, this leads to a notion of dependency: renaming a function foo in module A (mutually) depends on renaming function foo in module B etc. We describe important aspects of Rotor's design, implementation, and evaluation on two large codebases: Jane Street's core library and its dependencies, and the OCaml compiler itself. In these real-world settings we find that some cases involve a surprisingly complex network of dependencies, and that the use of the PPX preprocessor system presents significant challenges.
  • The functional programming paradigm presents its own unique challenges to refactoring. For the OCaml language in particular, the expressiveness of its module system makes this a highly non-trivial task and there is currently no automated support for large-scale refactoring in the OCaml language. We present Rotor, a tool for automatically renaming top-level value definitions in OCaml's module system. To compute the effect of renaming, Rotor relies on a novel concept which we call a value extension. This is a collection of related declarations in a program that must all be renamed at once. In practice, this leads to a notion of dependency: renaming a function foo in module A (mutually) depends on renaming function foo in module B etc. We describe important aspects of Rotor's design, implementation, and evaluation on two large codebases: Jane Street's core library and its dependencies, and the OCaml compiler itself. In these real-world settings we find that some cases involve a surprisingly complex network of dependencies, and that the use of the PPX preprocessor system presents significant challenges.
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