Data.String.Builder

The build function can be used to construct multi-line string literals in a monadic way:

{-# LANGUAGE OverloadedStrings #-}

import Data.String.Builder

mystring :: String
mystring = build $ do
  "foo"
  "bar"
  "baz"

Functions

build :: Builder -> String

Run a builder.

literal :: String -> Builder

Add a literal string.

Types

type Builder = BuilderM ()

data BuilderM a

A writer monad for string literals.

Instances

Monad BuilderM

Methods

(>>=) :: BuilderM a -> (a -> BuilderM b) -> BuilderM b

(>>) :: BuilderM a -> BuilderM b -> BuilderM b

return :: a -> BuilderM a

fail :: String -> BuilderM a

Functor BuilderM

Methods

fmap :: (a -> b) -> BuilderM a -> BuilderM b

(<$) :: a -> BuilderM b -> BuilderM a

Applicative BuilderM

Methods

pure :: a -> BuilderM a

(<*>) :: BuilderM (a -> b) -> BuilderM a -> BuilderM b

liftA2 :: (a -> b -> c) -> BuilderM a -> BuilderM b -> BuilderM c

(*>) :: BuilderM a -> BuilderM b -> BuilderM b

(<*) :: BuilderM a -> BuilderM b -> BuilderM a

Monoid Builder

Methods

mempty :: Builder

mappend :: Builder -> Builder -> Builder

mconcat :: [Builder] -> Builder

(~) * a () => IsString (BuilderM a)

Methods

fromString :: String -> BuilderM a