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Documents authored by Anderson, Paul

Document
DOI: 10.4230/LIPIcs.ECOOP.2017.12
muPuppet: A Declarative Subset of the Puppet Configuration Language

Authors: Weili Fu, Roly Perera, Paul Anderson, and James Cheney

Published in: LIPIcs, Volume 74, 31st European Conference on Object-Oriented Programming (ECOOP 2017)

Abstract
Puppet is a popular declarative framework for specifying and managing complex system configurations. The Puppet framework includes a domain-specific language with several advanced features inspired by object-oriented programming, including user-defined resource types, ‘classes’ with a form of inheritance, and dependency management. Like most real-world languages, the language has evolved in an ad hoc fashion, resulting in a design with numerous features, some of which are complex, hard to understand, and difficult to use correctly. We present an operational semantics for muPuppet, a representative subset of the Puppet language that covers the distinctive features of Puppet, while excluding features that are either deprecated or work-in-progress. Formalising the semantics sheds light on difficult parts of the language, identifies opportunities for future improvements, and provides a foundation for future analysis or debugging techniques, such as static typechecking or provenance tracking. Our semantics leads straightforwardly to a reference implementation in Haskell. We also discuss some of Puppet’s idiosyncrasies, particularly its handling of classes and scope, and present an initial corpus of test cases supported by our formal semantics.
Cite as

Weili Fu, Roly Perera, Paul Anderson, and James Cheney. muPuppet: A Declarative Subset of the Puppet Configuration Language. In 31st European Conference on Object-Oriented Programming (ECOOP 2017). Leibniz International Proceedings in Informatics (LIPIcs), Volume 74, pp. 12:1-12:27, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2017)

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@InProceedings{fu_et_al:LIPIcs.ECOOP.2017.12,
  author =	{Fu, Weili and Perera, Roly and Anderson, Paul and Cheney, James},
  title =	{{muPuppet: A Declarative Subset of the Puppet Configuration Language}},
  booktitle =	{31st European Conference on Object-Oriented Programming (ECOOP 2017)},
  pages =	{12:1--12:27},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-035-4},
  ISSN =	{1868-8969},
  year =	{2017},
  volume =	{74},
  editor =	{M\"{u}ller, Peter},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2017.12},
  URN =		{urn:nbn:de:0030-drops-72656},
  doi =		{10.4230/LIPIcs.ECOOP.2017.12},
  annote =	{Keywords: configuration languages, Puppet, operational semantics}
}
Document
DOI: 10.4230/DagSemProc.06301.12
Subjectivity in Clone Judgment: Can We Ever Agree?

Authors: Cory Kapser, Paul Anderson, Michael Godfrey, Rainer Koschke, Matthias Rieger, Filip van Rysselberghe, and Peter Weißgerber

Published in: Dagstuhl Seminar Proceedings, Volume 6301, Duplication, Redundancy, and Similarity in Software (2007)

Abstract
An objective definition of what a code clone is currently eludes the field. A small study was performed at an international workshop to elicit judgments and discussions from world experts regarding what characteristics define a code clone. Less than half of the clone candidates judged had 80% agreement amongst the judges. Judges appeared to differ primarily in their criteria for judgment rather than their interpretation of the clone candidates. In subsequent open discussion the judges provided several reasons for their judgments. The study casts additional doubt on the reliability of experimental results in the field when the full criterion for clone judgment is not spelled out.
Cite as

Cory Kapser, Paul Anderson, Michael Godfrey, Rainer Koschke, Matthias Rieger, Filip van Rysselberghe, and Peter Weißgerber. Subjectivity in Clone Judgment: Can We Ever Agree?. In Duplication, Redundancy, and Similarity in Software. Dagstuhl Seminar Proceedings, Volume 6301, pp. 1-5, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2007)

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@InProceedings{kapser_et_al:DagSemProc.06301.12,
  author =	{Kapser, Cory and Anderson, Paul and Godfrey, Michael and Koschke, Rainer and Rieger, Matthias and van Rysselberghe, Filip and Wei{\ss}gerber, Peter},
  title =	{{Subjectivity in Clone Judgment:  Can We Ever Agree?}},
  booktitle =	{Duplication, Redundancy, and Similarity in Software},
  pages =	{1--5},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2007},
  volume =	{6301},
  editor =	{Rainer Koschke and Ettore Merlo and Andrew Walenstein},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.06301.12},
  URN =		{urn:nbn:de:0030-drops-9701},
  doi =		{10.4230/DagSemProc.06301.12},
  annote =	{Keywords: Code clone, study, inter-rater agreement, ill-defined problem}
}
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