Metaprogramming

Generating Eta code at compile-time

Metaprogramming

Haskell Compatibility

Contents

Overview

In this section, we will discuss how Eta's metaprogramming interacts with Haskell's metaprogramming. This section is important to understand if you are using a Haskell package in your Eta project that uses Template Haskell.

Boot Packages

Most of Eta's metaprogramming facilities are provided by the eta-meta boot package which will be installed with Eta itself. The eta-meta package is equivalent to the template-haskell package in Haskell. In Eta, template-haskell is patched by re-exporting eta-meta's modules.


Eta Module Haskell Module
Language.Eta.Meta Language.Haskell.TH
Language.Eta.Meta.Lib Language.Haskell.TH.Lib
Language.Eta.Meta.Ppr Language.Haskell.TH.Ppr
Language.Eta.Meta.PprLib Language.Haskell.TH.PprLib
Language.Eta.Meta.Quote Language.Haskell.TH.Quote
Language.Eta.Meta.Syntax Language.Haskell.TH.Syntax
Language.Eta.Meta.LanguageExtensions Language.Haskell.TH.LanguageExtensions
Language.Eta.Meta.Binary Language.Haskell.TH.Binary

If you wish to use any Eta-specific functionality or Abstract Syntax Tree extensions, then you should use eta-meta directly. If you are attempting to make your project compilable by both GHC and Eta, use template-haskell.

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