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Documents authored by Leitão, António

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Leitão, António Menezes

Document
DOI: 10.4230/OASIcs.SLATE.2022.6
Extending PyJL - Transpiling Python Libraries to Julia

Authors: Miguel Marcelino and António Menezes Leitão

Published in: OASIcs, Volume 104, 11th Symposium on Languages, Applications and Technologies (SLATE 2022)

Abstract
Many high-level programming languages have emerged in recent years. Julia is one of these languages, claiming to offer the speed of C, the macro capabilities of Lisp, and the user-friendliness of Python. Julia’s syntax is one of its major strengths, making it ideal for scientific and numerical computing. Furthermore, Julia’s high-performance on modern hardware makes it an appealing alternative to Python. However, Python has a considerable advantage over Julia: its extensive library set. There have been efforts to make Python libraries available to Julia either through Foreign Function Interfaces (FFI’s), or through manual translation, but both have their tradeoffs: FFI’s do not take advantage of Julia’s performance, as they call Python’s Virtual Machine, and manual translation is demanding and time-consuming. To address these issues and bridge the gap between the two languages, we propose PyJL, a transpilation tool that converts Python source-code to human-readable Julia source-code. Although the development of PyJL is still at an early stage, our preliminary results reveal that the generated code follows the pragmatics of Julia and is capable of high performance.
Cite as

Miguel Marcelino and António Menezes Leitão. Extending PyJL - Transpiling Python Libraries to Julia. In 11th Symposium on Languages, Applications and Technologies (SLATE 2022). Open Access Series in Informatics (OASIcs), Volume 104, pp. 6:1-6:14, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)

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@InProceedings{marcelino_et_al:OASIcs.SLATE.2022.6,
  author =	{Marcelino, Miguel and Leit\~{a}o, Ant\'{o}nio Menezes},
  title =	{{Extending PyJL - Transpiling Python Libraries to Julia}},
  booktitle =	{11th Symposium on Languages, Applications and Technologies (SLATE 2022)},
  pages =	{6:1--6:14},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-95977-245-7},
  ISSN =	{2190-6807},
  year =	{2022},
  volume =	{104},
  editor =	{Cordeiro, Jo\~{a}o and Pereira, Maria Jo\~{a}o and Rodrigues, Nuno F. and Pais, Sebasti\~{a}o},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.SLATE.2022.6},
  URN =		{urn:nbn:de:0030-drops-167525},
  doi =		{10.4230/OASIcs.SLATE.2022.6},
  annote =	{Keywords: Source-to-Source Compiler, Automatic Transpilation, Library Translation, Python, Julia}
}
Document
DOI: 10.4230/OASIcs.SLATE.2022.13
Metaobject Protocols for Julia

Authors: Marcelo Santos and António Menezes Leitão

Published in: OASIcs, Volume 104, 11th Symposium on Languages, Applications and Technologies (SLATE 2022)

Abstract
Metaobject Protocols enable programmers to extend programming languages without the need to understand the lower level details of their implementation. However, designing these protocols comes with two challenges: allow programmers to limit their concerns to higher level concepts and minimize performance penalties in programs. In this work, we propose metaobject protocol for the programming language Julia. Julia’s object system is very limited, when compared to languages following the Object-Oriented paradigm. However, Julia’s compilation approach allows for a considerable degree of code optimization through the exploration of runtime type information. Through the usage of Julia’s run-time optimizations, we propose a metaobject protocol that combines user-extensibility with limited performance penalties. This paper focuses on the development of a multiple inheritance method dispatch and method combination mechanisms with zero runtime overhead.
Cite as

Marcelo Santos and António Menezes Leitão. Metaobject Protocols for Julia. In 11th Symposium on Languages, Applications and Technologies (SLATE 2022). Open Access Series in Informatics (OASIcs), Volume 104, pp. 13:1-13:15, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)

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@InProceedings{santos_et_al:OASIcs.SLATE.2022.13,
  author =	{Santos, Marcelo and Leit\~{a}o, Ant\'{o}nio Menezes},
  title =	{{Metaobject Protocols for Julia}},
  booktitle =	{11th Symposium on Languages, Applications and Technologies (SLATE 2022)},
  pages =	{13:1--13:15},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-95977-245-7},
  ISSN =	{2190-6807},
  year =	{2022},
  volume =	{104},
  editor =	{Cordeiro, Jo\~{a}o and Pereira, Maria Jo\~{a}o and Rodrigues, Nuno F. and Pais, Sebasti\~{a}o},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.SLATE.2022.13},
  URN =		{urn:nbn:de:0030-drops-167597},
  doi =		{10.4230/OASIcs.SLATE.2022.13},
  annote =	{Keywords: Julia, Metaobject Protocols, Object-Oriented Programming, Performance}
}
Document
Front Matter
DOI: 10.4230/OASIcs.SLATE.2018.0
Front Matter, Table of Contents, Preface, Conference Organization

Authors: Pedro Rangel Henriques, José Paulo Leal, António Menezes Leitão, and Xavier Gómez Guinovart

Published in: OASIcs, Volume 62, 7th Symposium on Languages, Applications and Technologies (SLATE 2018)

Abstract
Front Matter, Table of Contents, Preface, Conference Organization
Cite as

7th Symposium on Languages, Applications and Technologies (SLATE 2018). Open Access Series in Informatics (OASIcs), Volume 62, pp. 0:i-0:xiv, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)

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@InProceedings{henriques_et_al:OASIcs.SLATE.2018.0,
  author =	{Henriques, Pedro Rangel and Leal, Jos\'{e} Paulo and Leit\~{a}o, Ant\'{o}nio Menezes and Guinovart, Xavier G\'{o}mez},
  title =	{{Front Matter, Table of Contents, Preface, Conference Organization}},
  booktitle =	{7th Symposium on Languages, Applications and Technologies (SLATE 2018)},
  pages =	{0:i--0:xiv},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-95977-072-9},
  ISSN =	{2190-6807},
  year =	{2018},
  volume =	{62},
  editor =	{Henriques, Pedro Rangel and Leal, Jos\'{e} Paulo and Leit\~{a}o, Ant\'{o}nio Menezes and Guinovart, Xavier G\'{o}mez},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.SLATE.2018.0},
  URN =		{urn:nbn:de:0030-drops-92582},
  doi =		{10.4230/OASIcs.SLATE.2018.0},
  annote =	{Keywords: Front Matter, Table of Contents, Preface, Conference Organization}
}
Document
DOI: 10.4230/OASIcs.SLATE.2018.7
Context-Oriented Algorithmic Design

Authors: Bruno Ferreira and António Menezes Leitão

Published in: OASIcs, Volume 62, 7th Symposium on Languages, Applications and Technologies (SLATE 2018)

Abstract
Currently, algorithmic approaches are being introduced in several areas of expertise, namely Architecture. Algorithmic Design (AD) is an approach for architecture that takes advantage of algorithms to produce complex designs, to simplify the exploration of variations, or to mechanize tasks, including those related to analysis and optimization of designs. However, architects might need different models of the same design for different kinds of analysis, which tempts them to extend the same code base for different purposes, typically making the code brittle and hard to understand. In this paper, we propose to extend AD with Context-Oriented Programming (COP), a programming paradigm based on context that dynamically changes the behavior of the code. To this end, we propose a COP library and we explore its combination with an AD tool. Finally, we implement two case studies with our context-oriented approach, and discuss their advantages and disadvantages when compared to the traditional AD approach.
Cite as

Bruno Ferreira and António Menezes Leitão. Context-Oriented Algorithmic Design. In 7th Symposium on Languages, Applications and Technologies (SLATE 2018). Open Access Series in Informatics (OASIcs), Volume 62, pp. 7:1-7:14, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)

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@InProceedings{ferreira_et_al:OASIcs.SLATE.2018.7,
  author =	{Ferreira, Bruno and Leit\~{a}o, Ant\'{o}nio Menezes},
  title =	{{Context-Oriented Algorithmic Design}},
  booktitle =	{7th Symposium on Languages, Applications and Technologies (SLATE 2018)},
  pages =	{7:1--7:14},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-95977-072-9},
  ISSN =	{2190-6807},
  year =	{2018},
  volume =	{62},
  editor =	{Henriques, Pedro Rangel and Leal, Jos\'{e} Paulo and Leit\~{a}o, Ant\'{o}nio Menezes and Guinovart, Xavier G\'{o}mez},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.SLATE.2018.7},
  URN =		{urn:nbn:de:0030-drops-92658},
  doi =		{10.4230/OASIcs.SLATE.2018.7},
  annote =	{Keywords: context-oriented programming, algorithmic design, Python}
}
Document
DOI: 10.4230/OASIcs.SLATE.2014.127
Implementing Python for DrRacket

Authors: Pedro Palma Ramos and António Menezes Leitão

Published in: OASIcs, Volume 38, 3rd Symposium on Languages, Applications and Technologies (2014)

Abstract
The Python programming language is becoming increasingly popular in a variety of areas, most notably among novice programmers. On the other hand, Racket and other Scheme dialects are considered excellent vehicles for introducing Computer Science concepts. This paper presents an implementation of Python for Racket and the DrRacket IDE. This allows Python programmers to use Racket libraries and vice versa, as well as using DrRacket's pedagogic features. In particular, it allows architects and designers to use Python as a front-end programming language for Rosetta, an IDE for computer-aided design, whose modelling primitives are defined in Racket. Our proposed solution involves compiling Python code into equivalent Racket source code. For the runtime implementation, we present two different strategies: (1) using a foreign function interface to borrow the data types and primitives from Python's virtual machine or (2) implementing Python's data model over Racket data types. While the first strategy is easily implemented and provides immediate support for Python's standard library and existing third-party libraries, it suffers from performance issues: it runs, at least, one order of magnitude slower when compared to Python’s reference implementation. The second strategy requires us to implement Python's data model in Racket and port all of Python's standard library, but it succeeds in solving the former's performance issues. Furthermore, it makes interoperability between Python and Racket code easier to implement and simpler to use.
Cite as

Pedro Palma Ramos and António Menezes Leitão. Implementing Python for DrRacket. In 3rd Symposium on Languages, Applications and Technologies. Open Access Series in Informatics (OASIcs), Volume 38, pp. 127-141, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2014)

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@InProceedings{ramos_et_al:OASIcs.SLATE.2014.127,
  author =	{Ramos, Pedro Palma and Leit\~{a}o, Ant\'{o}nio Menezes},
  title =	{{Implementing Python for DrRacket}},
  booktitle =	{3rd Symposium on Languages, Applications and Technologies},
  pages =	{127--141},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-939897-68-2},
  ISSN =	{2190-6807},
  year =	{2014},
  volume =	{38},
  editor =	{Pereira, Maria Jo\~{a}o Varanda and Leal, Jos\'{e} Paulo and Sim\~{o}es, Alberto},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.SLATE.2014.127},
  URN =		{urn:nbn:de:0030-drops-45656},
  doi =		{10.4230/OASIcs.SLATE.2014.127},
  annote =	{Keywords: Python, Racket, language implementations, compilers}
}
Document
DOI: 10.4230/OASIcs.SLATE.2012.107
The Impact of Programming Languages in Code Cloning

Authors: Jaime Filipe Jorge and António Menezes Leitão

Published in: OASIcs, Volume 21, 1st Symposium on Languages, Applications and Technologies (2012)

Abstract
Code cloning is a duplication of source code fragments that frequently occurs in large software systems. Although different studies exist that evidence cloning benefits, several others expose its harmfulness, specifically upon inconsistent clone management. One important cause for the creation of software clones is the inherent abstraction capabilities and terseness of the programming language being used. This paper focuses on the features of two different programming languages, namely Java and Scala, and studies how different language constructs can induce or reduce code cloning. This study was further developed using our tool Kamino which provided clone detection and concrete values.
Cite as

Jaime Filipe Jorge and António Menezes Leitão. The Impact of Programming Languages in Code Cloning. In 1st Symposium on Languages, Applications and Technologies. Open Access Series in Informatics (OASIcs), Volume 21, pp. 107-122, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2012)

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@InProceedings{jorge_et_al:OASIcs.SLATE.2012.107,
  author =	{Jorge, Jaime Filipe and Leit\~{a}o, Ant\'{o}nio Menezes},
  title =	{{The Impact of Programming Languages in Code Cloning}},
  booktitle =	{1st Symposium on Languages, Applications and Technologies},
  pages =	{107--122},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-939897-40-8},
  ISSN =	{2190-6807},
  year =	{2012},
  volume =	{21},
  editor =	{Sim\~{o}es, Alberto and Queir\'{o}s, Ricardo and da Cruz, Daniela},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.SLATE.2012.107},
  URN =		{urn:nbn:de:0030-drops-35178},
  doi =		{10.4230/OASIcs.SLATE.2012.107},
  annote =	{Keywords: Clone Detection, Software Engineering, Programming Languages, Software Management}
}

Leitão, António

Document
Complete Volume
DOI: 10.4230/OASIcs.SLATE.2018
OASIcs, Volume 62, SLATE'18, Complete Volume

Authors: Pedro Rangel Henriques, José Paulo Leal, António Leitão, and Xavier Gómez Guinovart

Published in: OASIcs, Volume 62, 7th Symposium on Languages, Applications and Technologies (SLATE 2018)

Abstract
OASIcs, Volume 62, SLATE'18, Complete Volume
Cite as

7th Symposium on Languages, Applications and Technologies (SLATE 2018). Open Access Series in Informatics (OASIcs), Volume 62, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)

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@Proceedings{henriques_et_al:OASIcs.SLATE.2018,
  title =	{{OASIcs, Volume 62, SLATE'18, Complete Volume}},
  booktitle =	{7th Symposium on Languages, Applications and Technologies (SLATE 2018)},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-95977-072-9},
  ISSN =	{2190-6807},
  year =	{2018},
  volume =	{62},
  editor =	{Henriques, Pedro Rangel and Leal, Jos\'{e} Paulo and Leit\~{a}o, Ant\'{o}nio Menezes and Guinovart, Xavier G\'{o}mez},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.SLATE.2018},
  URN =		{urn:nbn:de:0030-drops-92790},
  doi =		{10.4230/OASIcs.SLATE.2018},
  annote =	{Keywords: Computing methodologies, Natural language processing, Software and its engineering, Compilers, Information systems, World Wide Web}
}
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