University of Minnesota
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Minnesota Extensible Language Tools

Software development is a time-consuming and error-prone process that often results in unreliable and insecure software. At least part of the reason for these undesirable results is that large semantic gap between the programmer's high-level understanding of the problem and the relatively low-level programming language in which the problem solutions are encoded. Thus, programmers cannot "say what they mean" but must encode their ideas as programming idioms at a lower level of abstraction. This wastes time and is the source of many errors. A long range goal is to improve the software development process and the quality of the resulting software artifacts by reducing the semantic gap. Extensible languages provide a promising way to achieve this goal. An extensible language can easily be extended with the unique combination of domain-specific language features that raises the level of abstraction to that of the task at hand. The extended language provides the programmer with language constructs, optimizations, and static program analyses to significantly simplify the software development process.

Recent Publications

Building Extensible Specifications and Implementations of Promela with AbleP

This paper describes how new language features can be seamlessly added to an extensible specification of Promela to provide new (domain-specific) notations and analyses to the engineer. This is accomplished using ableP, an extensible specification and implementation of Promela, the modeling language used by the SPIN model checker. Language extensions described here include an enhanced select-statement, a convenient tabular notation for boolean expressions, a notion of discrete time, and extended type checking.

Integrating attribute grammar and functional programming language features

While attribute grammars (AGs) have several features making them advantageous for specifying language processing tools, functional programming languages offer a myriad of features also well-suited for such tasks. Much other work shows the close relationship between these two approaches, often in the form of embedding AGs into lazy functional languages. This paper continues in this tradition, but in the other direction, by integrating various functional language features into AGs.

An Overview of XRobots: A Hierarchical State Machine-Based Language

This paper introduces a prototype domain-specific language for programming mobile robots that is based on hierarchical state machines. A novelty of this language is that states are treated as first class entities in the language and thus they can be passed as arguments to other parameterized states. The structure and behavior of the language is presented, along with an example program. Further work and language design challenges are also discussed.

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