By Paul Klint, Bert Lisser, Atze van der Ploeg (auth.), Anthony Sloane, Uwe Aßmann (eds.)

This publication constitutes the completely refereed post-proceedings of the 4th overseas convention on software program Language Engineering, SLE 2011, held in Braga, Portugal, in July 2011.
The 18 papers awarded including four tool/language demonstration papers have been rigorously reviewed and chosen from various submissions. SLE’s optimum challenge is to inspire and arrange conversation among groups that experience generally checked out software program languages from varied, extra really good, and but complementary views. SLE emphasizes the elemental thought of languages in preference to any recognition in particular technical spaces.

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Additional resources for Software Language Engineering: 4th International Conference, SLE 2011, Braga, Portugal, July 3-4, 2011, Revised Selected Papers

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Nesting modules or connecting them by means of context references is a sufficient definition for context composition. The execution of model transformations first requires the manual instantiation of modules into concrete application contexts (between concrete modeling artifacts), which implies the instantiation of data-flow compositions. Second, for a set of instantiated modules, the execution engine automatically applies the represented model transformations in the required sequence determined by the data-flow composition.

Epsilon allows black-box data-flow composition of Epsilon tasks, defined in E* languages20 or additional languages like ATL21 . The data-flow composition is implemented with Ant22 scripts. In addition, Epsilon provides its own transformation language ETL. Within ETL, context compositions are possible. However, context compositions are not possible with other transformation languages as ETL and, as in the two approaches above, the traceability information of the context composition has to be interpreted by the transformation.

Comments and whitespace. This is especially relevant in the context of refactorings, which produce source code for human consumption. In this paper, we present an algorithm for fully automatic source code reconstruction for source-to-source transformations. The algorithm preserves the layout and comments of the unaffected parts and reconstructs the indentation of the affected parts, using a set of clearly defined heuristic rules to handle comments. 1 Introduction The successful development of new languages is currently hindered by the high cost of tool building.

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