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Template Haskell is an experimental language extension to the Haskell programming language implemented in the Glasgow Haskell Compiler (version 6 and later).[1] In early incarnations it was also known as Template Meta-Haskell.
It allows compile-time metaprogramming and generative programming by means of manipulating abstract syntax trees and 'splicing' results back into a program. The abstract syntax is represented using ordinary Haskell data types and the manipulations are performed using ordinary Haskell functions.
'Quasi-quote' brackets [| and |] are used to get the abstract syntax tree for the enclosed expression and 'splice' brackets $( and ) are used to convert from abstract syntax tree into code.
As of GHC-6.10, Template Haskell provides support for user-defined quasi-quoters, which allows users to write parsers which can generate Haskell code from an arbitrary syntax. This syntax is also enforced at compile time. For example, using a custom quasi-quoter for regular expressions could look like this:
digitsFollowedByLetters=[$re|\d+\s+|]
^Sheard, Tim; Jones, Simon Peyton (3 October 2002). "Template meta-programming for Haskell". Proceedings of the 2002 ACM SIGPLAN workshop on Haskell. Association for Computing Machinery. pp. 1–16. doi:10.1145/581690.581691. ISBN 1581136056. S2CID 6096655.
TemplateHaskell is an experimental language extension to the Haskell programming language implemented in the Glasgow Haskell Compiler (version 6 and...
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(C++). As an illustration, the above mentioned Haskell example of typeclass Eq would be written as template <typename T> concept Equal = requires (T a, T...
produce the entirety of the list thus allowing, for example, the previous Haskell definition of the members of an infinite list. The existence of related...
improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages) (Learn how and when to remove this message)...
(PDF) on 2011-10-08. Retrieved 2009-08-26. "Haskell in industry". Haskell Wiki. Retrieved 2009-08-26. Haskell has a diverse range of use commercially, from...
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