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| Opal 1. A language. ["OPAL: A High Level Language and Environment for DSP boards on PC", J.P. Schwartz et al, Proc ICASSP-89, 1989]. 2. The language of the . ["Making Smalltalk a Database System", G. Copeland et al, Proc SIGMOD'84, ACM 1984, pp.316- 325]. 3. A language with provision for s. An extension of . ["C-E-I-R OPAL", D. Pilling, Internal Report, C.E.I.R. Ltd. (1963)]. 4. A language for compiler testing said to be used internally by . 5. A language designed at the as a testbed for the development of s. OPAL integrates concepts from Algebraic Specification and Functional Programming, which favour the (formal) development of (large) production-quality software written in a style. The core of OPAL is a , , applicative language which belongs to the tradition of and . The algebraic flavour of OPAL is visible in the syntactical appearance and in the preference of to . OPAL supports: - each language unit is divided into an interface (signature) and an implementation part; selective import; s; free constructor on , which allow pattern-based function definitions despite quite different implementations; full of names; puristic scheme language with no data types (except s and denotations). OPAL and its predecessor OPAL-0 have been used for some time at the Technische Universitaet Berlin in CS courses and for research into optimising compilers for applicative languages. The OPAL compiler itself is writte entirely in OPAL. An overview is given in "OPAL: Design And Implementation of an Algebraic Programming Language". {Home (http://www.cs.tu-berlin.de/~opal/)} {(ftp://ftp.cs.tu-berlin.de/pub/local/uebb/papers/DesignImplOpal.ps.gz)}. (1995-02-16) |
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