4 Search Results for "Gil, Yossi"

Document
Pearl/Brave New Idea
DOI: 10.4230/LIPIcs.ECOOP.2023.44
Python Type Hints Are Turing Complete (Pearl/Brave New Idea)

Authors: Ori Roth

Published in: LIPIcs, Volume 263, 37th European Conference on Object-Oriented Programming (ECOOP 2023)

Abstract
Grigore proved that Java generics are Turing complete by describing a reduction from Turing machines to Java subtyping. Furthermore, he demonstrated that his "subtyping machines" could have metaprogramming applications if not for their extremely high compilation times. The current work reexamines Grigore’s study in the context of another prominent programming language - Python. We show that the undecidable Java fragment used in Grigore’s construction is included in Python’s type system, making it Turing complete. In contrast to Java, Python type hints are checked by third-party static analyzers and run-time type checkers. The new undecidability result means that both kinds of type checkers cannot fully incorporate Python’s type system and guarantee termination. The paper includes a survey of infinite subtyping cycles in various type checkers and type reification in different Python distributions. In addition, we present an alternative reduction in which the Turing machines are simulated in real time, resulting in a significantly faster compilation. Our work is accompanied by a Python implementation of both reductions that compiles Turing machines into Python subtyping machines.
Cite as

Ori Roth. Python Type Hints Are Turing Complete (Pearl/Brave New Idea). In 37th European Conference on Object-Oriented Programming (ECOOP 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 263, pp. 44:1-44:15, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@InProceedings{roth:LIPIcs.ECOOP.2023.44,
  author =	{Roth, Ori},
  title =	{{Python Type Hints Are Turing Complete}},
  booktitle =	{37th European Conference on Object-Oriented Programming (ECOOP 2023)},
  pages =	{44:1--44:15},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-281-5},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{263},
  editor =	{Ali, Karim and Salvaneschi, Guido},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2023.44},
  URN =		{urn:nbn:de:0030-drops-182372},
  doi =		{10.4230/LIPIcs.ECOOP.2023.44},
  annote =	{Keywords: nominal Subtyping with Variance, Python}
}
Document
Artifact
DOI: 10.4230/DARTS.5.2.12
Fling - A Fluent API Generator (Artifact)

Authors: Ori Roth and Yossi Gil

Published in: DARTS, Volume 5, Issue 2, Special Issue of the 33rd European Conference on Object-Oriented Programming (ECOOP 2019)

Abstract
The first general and practical solution of the fluent API problem is presented. We give an algorithm that given a deterministic context free language (equivalently, LR(k), k >= 0 language) encodes it in an unbounded parametric polymorphism type system employing only a polynomial number of types. The theoretical result is employed in an actual tool Fling - a fluent API compiler-compiler in the style of YACC, tailored for embedding DSLs in Java.
Cite as

Ori Roth and Yossi Gil. Fling - A Fluent API Generator (Artifact). In Special Issue of the 33rd European Conference on Object-Oriented Programming (ECOOP 2019). Dagstuhl Artifacts Series (DARTS), Volume 5, Issue 2, pp. 12:1-12:9, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@Article{roth_et_al:DARTS.5.2.12,
  author =	{Roth, Ori and Gil, Yossi},
  title =	{{Fling - A Fluent API Generator}},
  pages =	{12:1--12:9},
  journal =	{Dagstuhl Artifacts Series},
  ISSN =	{2509-8195},
  year =	{2019},
  volume =	{5},
  number =	{2},
  editor =	{Roth, Ori and Gil, Yossi},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/DARTS.5.2.12},
  URN =		{urn:nbn:de:0030-drops-107897},
  doi =		{10.4230/DARTS.5.2.12},
  annote =	{Keywords: Fluent API, compilation, generics, code generation}
}
Document
DOI: 10.4230/LIPIcs.ECOOP.2019.13
Fling - A Fluent API Generator

Authors: Yossi Gil and Ori Roth

Published in: LIPIcs, Volume 134, 33rd European Conference on Object-Oriented Programming (ECOOP 2019)

Abstract
We present the first general and practical solution of the fluent API problem - an algorithm, that given a deterministic language (equivalently, LR(k), k >= 0 language) encodes it in an unbounded parametric polymorphism type system employing only a polynomial number of types. The theoretical result is accompanied by an actual tool Fling - a fluent API compiler-compiler in the venue of YACC, tailored for embedding DSLs in Java.
Cite as

Yossi Gil and Ori Roth. Fling - A Fluent API Generator. In 33rd European Conference on Object-Oriented Programming (ECOOP 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 134, pp. 13:1-13:25, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@InProceedings{gil_et_al:LIPIcs.ECOOP.2019.13,
  author =	{Gil, Yossi and Roth, Ori},
  title =	{{Fling - A Fluent API Generator}},
  booktitle =	{33rd European Conference on Object-Oriented Programming (ECOOP 2019)},
  pages =	{13:1--13:25},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-111-5},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{134},
  editor =	{Donaldson, Alastair F.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2019.13},
  URN =		{urn:nbn:de:0030-drops-108053},
  doi =		{10.4230/LIPIcs.ECOOP.2019.13},
  annote =	{Keywords: fluent API, type system, compilation, code generation}
}
Document
DOI: 10.4230/LIPIcs.ECOOP.2016.10
Formal Language Recognition with the Java Type Checker

Authors: Yossi Gil and Tomer Levy

Published in: LIPIcs, Volume 56, 30th European Conference on Object-Oriented Programming (ECOOP 2016)

Abstract
This paper is a theoretical study of a practical problem: the automatic generation of Java Fluent APIs from their specification. We explain why the problem's core lies with the expressive power of Java generics. Our main result is that automatic generation is possible whenever the specification is an instance of the set of deterministic context-free languages, a set which contains most "practical" languages. Other contributions include a collection of techniques and idioms of the limited meta-programming possible with Java generics, and an empirical measurement demonstrating that the runtime of the "javac" compiler of Java may be exponential in the program's length, even for programs composed of a handful of lines and which do not rely on overly complex use of generics.
Cite as

Yossi Gil and Tomer Levy. Formal Language Recognition with the Java Type Checker. In 30th European Conference on Object-Oriented Programming (ECOOP 2016). Leibniz International Proceedings in Informatics (LIPIcs), Volume 56, pp. 10:1-10:27, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2016)

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@InProceedings{gil_et_al:LIPIcs.ECOOP.2016.10,
  author =	{Gil, Yossi and Levy, Tomer},
  title =	{{Formal Language Recognition with the Java Type Checker}},
  booktitle =	{30th European Conference on Object-Oriented Programming (ECOOP 2016)},
  pages =	{10:1--10:27},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-014-9},
  ISSN =	{1868-8969},
  year =	{2016},
  volume =	{56},
  editor =	{Krishnamurthi, Shriram and Lerner, Benjamin S.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2016.10},
  URN =		{urn:nbn:de:0030-drops-61042},
  doi =		{10.4230/LIPIcs.ECOOP.2016.10},
  annote =	{Keywords: Parser Generators, Generic Programming, Fluent API}
}
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