HIndent.Pragma

Pragma-related functions.

Documentation

extractPragmasFromCode

Arguments

:: String

-> [(String, String)]

(Pragma's name (e.g., LANGUAGE), Pragma's element (e.g., "CPP, DerivingVia"))

Extracts all pragmas from the given source code.

FIXME: The function is slow because it lexicographically analyzes the given source code. An alternative way is to use regular expressions. However, this method cannot determine if what appears to be a pragma is really a pragma, or requires complex regular expressions. For example, {-nn{-# LANGUAGE CPP #-}nn-} is not a pragma, but is likely to be recognized as such.

extractPragmaNameAndElement

Arguments

:: String

-> Maybe (String, String)

(Pragma's name (e.g., LANGUAGE), Pragma's element (e.g., "CPP, DerivingVia"))

Extracts the pragma's name and its element from the given pragma.

This function returns a Nothing if it fails to extract them.

pragmaRegex :: Regex

A regex to match against a pragma.