Hackage :: [Package]

exon: Customizable quasiquote interpolation

[ library, string ] [ Propose Tags ] [ Report a vulnerability ]
Versions [RSS] 0.1.0.0, 0.1.1.0, 0.2.0.0, 0.2.0.1, 0.3.0.0, 0.4.0.0, 0.5.0.0, 1.0.0.0, 1.0.0.1, 1.0.0.2, 1.0.1.0, 1.1.0.0, 1.2.0.0, 1.3.0.0, 1.4.0.0, 1.5.0.0, 1.5.0.1, 1.6.0.0, 1.6.0.1, 1.6.0.2, 1.6.1.0, 1.6.1.1, 1.7.0.0, 1.7.1.0, 1.7.2.0 (info)
Change log changelog.md
Dependencies base (>=4 && <5), ghc, incipit-base (>=0.4 && <0.6), parsec, template-haskell [details]
License BSD-2-Clause-Patent
Copyright 2023 Torsten Schmits
Author Torsten Schmits
Maintainer hackage@tryp.io
Uploaded by tek at 2023-10-25T21:01:40Z
Category String
Home page https://github.com/tek/exon#readme
Bug tracker https://github.com/tek/exon/issues
Source repo head: git clone https://github.com/tek/exon
Distributions LTSHaskell:1.7.2.0, NixOS:1.7.2.0, Stackage:1.7.2.0
Reverse Dependencies 15 direct, 6 indirect [details]
Downloads 2363 total (44 in the last 30 days)
Rating (no votes yet) [estimated by Bayesian average]
Your Rating
  • λ
  • λ
  • λ
Status Docs uploaded by user
Build status unknown [no reports yet]

Readme for exon-1.6.0.2

[back to package description]

This Haskell library provides string interpolation in quasiquotes, allowing you to build strings like this:

animal = "snake"
location = "a tree"
[exon|#{animal} in #{location}|]
-- "snake in a tree"

Each step of the process is customizable based on the result type of the quote, making it possible to construct strings for arbitrary types. For example, String -> String is the type used by showsPrec, which can be a bit of a hassle to write:

data Record =
  Record {
    number :: Int,
    maybeNumber :: Maybe Int,
    value :: Value
  }

instance Show Record where
  showsPrec d Record {..} =
    showParen (d > 10) [exon|Record #{showsPrec 11 number} #{showsPrec 11 maybeNumber} #{showsPrec 11 value}|]