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First-class patterns

Part of: JFP Research Articles

Published online by Cambridge University Press:  01 March 2009

BARRY JAY  and
DELIA KESNER
BARRY JAY
Affiliation:
University of Technology, Sydney, Australia (e-mail: cbj@it.uts.edu.au)
DELIA KESNER
Affiliation:
PPS, CNRS and Université Paris Diderot, Paris, France (e-mail: kesner@pps.jussieu.fr)
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Abstract

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Pure pattern calculus supports pattern-matching functions in which patterns are first-class citizens that can be passed as parameters, evaluated and returned as results. This new expressive power supports two new forms of polymorphism. Path polymorphism allows recursive functions to traverse arbitrary data structures. Pattern polymorphism allows patterns to be treated as parameters which may be collected from various sources or generated from training data. A general framework for pattern calculi is developed. It supports a proof of confluence that is parameterised by the nature of the matching algorithm, suitable for the pure pattern calculus and all other known pattern calculi.

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Type
Articles
Information
Journal of Functional Programming , Volume 19 , Issue 2 , March 2009 , pp. 191 - 225
Copyright
Copyright © Cambridge University Press 2009

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