Parsing and pretty-printing

The libraries in this subsection are as follows:

• parsec: Very featureful, general parser combinator library. Old and poorly maintained. Slower than attoparsec

• attoparsec: Simple and fast parser combinator library. Fewer features than Parsec

• megaparsec: A fork of Parsec, well maintained. Extremely flexible. Faster than Parsec but considerably slower than Attoparsec

• happy / alex: Parser combinator libraries aimed towards parsing (programming language) grammars.

• pcre-heavy: A reasonable regular-expression library.

Parsing is something that Haskell shines at. Applicative and monadic parser interfaces are really expressive. There are many awesome general-purpose parser libraries for Haskell. In general, the choice should be between Attoparsec and Megaparsec.

Attoparsec should be preferred as speed is critical; Megaparsec if features are more important. Attoparsec suits best for well-defined file formats, such as serialization. Megaparsec is a better choice when dealing with...