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Swidan, A.A.S. (author), Hermans, F.F.J. (author), Koesoemowidjojo, Ruben (author)Spreadsheets are used extensively for calculations in several domains, especially in finance and insurance. Spreadsheets offer a clear benefit to their users: they are an easy to learn application in which to express their business needs, however, there are downsides too. Like software, spreadsheets can have a long life span in which they are...report 2016
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Hermans, F. (author), Aivaloglou, E. (author)Recently, block-based programming languages like Alice, Scratch and Blockly have become popular tools for programming education. There is substantial research showing that block-based languages are suitable for early programming education. But can block-based programs be smelly too? And does that matter to learners? In this paper we explore the...report 2016
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Dintzner, N. (author), Van Deursen, A. (author), Pinzger, M. (author)Evolving a large scale, highly variable systems is a challenging task. For such a system, evolution operations often require to update consistently both their implementation and its feature model. In this context, the evolution of the feature model closely follows the evolution of the system. The purpose of this work is to show that fine-grained...report 2015
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Hermans, F. (author), Aivaloglou, E. (author), Jansen, B. (author)Spreadsheets are used heavily in many business domains around the world. They are easy to use and as such enable end-user programmers to and build and maintain all sorts of reports and analyses. In addition to using spreadsheets for modeling and calculation, spreadsheets are often also used for creating reports and dashboards: combining data...report 2015
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Coelho, R. (author), Almeida, L. (author), Gousios, G. (author), Van Deursen, A. (author)This paper reports on a study mining the exception stack traces included in 159,048 issues reported on Android projects hosted in GitHub (482 projects) and Google Code (157 projects). The goal of this study is to investigate whether stack trace information can reveal bug hazards related to exception handling code that may lead to a decrease in...report 2015
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Van Antwerpen, H. (author), Néron, P. (author), Tolmach, A. (author), Visser, E. (author), Wachsmuth, G. (author)In previous work, we introduced scope graphs as a formalism for describing program binding structure and performing name resolution in an AST-independent way. In this paper, we show how to use scope graphs to build static semantic analyzers. We use constraints extracted from the AST to specify facts about binding, typing, and initialization. We...report 2015
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Van Antwerpen, H. (author), Néron, P. (author), Tolmach, A. (author), Visser, E. (author), Wachsmuth, G. (author)In previous work, we introduced scope graphs as a formalism for describing program binding structure and performing name resolution in an AST-independent way. In this paper, we show how to use scope graphs to build static semantic analyzers. We use constraints extracted from the AST to specify facts about binding, typing, and initialization. We...report 2015
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Dintzner, N. (author)Despite a global recognition of the problem, and massive investment from researchers and practitioners, the evolution of complex software systems is still a major challenge for today’s architects and developers. In the context of product lines, or highly configurable systems, variability in the implementation and design makes many of the pre...report 2015
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Vergu, V. (author), Neron, P. (author), Visser, E. (author)The formal definition the semantics of a programming language and its implementation are typically separately defined, with the risk of divergence such that properties of the formal semantics are not properties of the implementation. In this paper, we present DynSem, a domain-specific language for the specification of the dynamic semantics of...report 2015
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Voelter, M. (author), Van Deursen, A. (author), Kolb, B. (author), Eberle, S. (author)We report on an industrial case study on developing the embedded software for a smart meter using the C programming language and domain-specific extensions of C such as components, physical units, state machines, registers and interrupts. We find that the extensions help significantly with managing the complexity of the software. They improve...report 2015
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Van Antwerpen, H. (author), Neron, P. (author), Tolmach, A. (author), Visser, E. (author), Wachsmuth, G. (author)We extend and combine two existing declarative formalisms, the scope graphs of Neron et al. and type constraint systems, to build a language-independent theory that can describe both name and type resolution for realistic languages with complex scope and typing rules. Unlike conventional static semantics presentations, our approach maintains a...report 2015
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Dintzner, N.J.R. (author), Van Deursen, A. (author), Pinzger, M. (author)Evolving a large scale, highly variable sys- tems is a challenging task. For such a system, evolution operations often require to update consistently both their implementation and its feature model. In this con- text, the evolution of the feature model closely follows the evolution of the system. The purpose of this work is to show that fine...report 2015
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Neron, P.J.M. (author), Tolmach, A.P. (author), Visser, E. (author), Wachsmuth, G. (author)We describe a language-independent theory for name binding and resolution, suitable for programming languages with complex scoping rules including both lexical scoping and modules. We formulate name resolution as a two stage problem. First a language-independent scope graph is constructed using language-specific rules from an abstract syntax...report 2015
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Harkes, D.C. (author), Visser, E. (author)Object-oriented programming languages support concise navigation of relations represented by references. However, relations are not first-class citizens and bidirectional navigation is not supported. The relational paradigm provides first-class relations, but with bidirectional navigation through verbose queries. We present a systematic analysis...report 2014
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Dintzner, N.J.R. (author), Kulesza, U. (author), Van Deursen, A. (author), Pinzger, M. (author)Evolving large-scale, complex and highly variable systems is known to be a difficult task, where a single change can ripple through various parts of the system with potentially undesirable effects. In the case of product lines, and moreover multi-product lines, a change may affect only certain variants or certain combinations of features, making...report 2014
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Espinha, T. (author), Zaidman, A. (author), Gross, H.G. (author)Web APIs provide a systematic and extensible approach for application-toapplication interaction. Developers using web APIs are forced to accompany the API providers in their software evolution tasks. In order to understand the distress caused by this imposition on web API client developers we perform a semi-structured interview with six such...report 2014
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Raemaekers, S. (author), Van Deursen, A. (author), Visser, J. (author)For API users, backward compatibility of new releases is important, as it permits safe and fast upgrading when the new release becomes available. To signal safe upgrading, version naming schemes such as semantic versioning provide strict rules on major (breaking changes permitted) versus minor and patch (no breaking changes permitted) releases....report 2014
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Van Deursen, A. (author), Mesbah, A. (author), Nederlof, A. (author)In this paper we review five years of research in the field of automated crawling and testing of web applications. We describe the open source Crawljax tool, and the various extensions that have been proposed in order to address such issues as cross-browser compatibility testing, web application regression testing, and style sheet usage analysis...report 2014
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Gousios, G. (author), Zaidman, A. (author), Storey, M.A. (author), Van Deursen, A. (author)In the pull-based development model, the integrator has the crucial role of managing and integrating contributions. This work focuses on the role of the integrator and investigates working habits and challenges alike. We set up an exploratory qualitative study involving a large-scale survey involving 749 integrators, to which we add quantitative...report 2014
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Huijgens, H. (author), Gousios, G. (author), Van Deursen, A. (author)A medium-sized west-European telecom company experienced a worsening trend in performance, indicating that the organization did not learn from history, in combination with much time and energy spent on preparation and review of project proposals. In order to create more transparency in the supplier proposal process a pilot was started on...report 2014