ghc-ghc-exactprint

ExactPrint for GHC

Using the API Annotations available from GHC 7.10.2, this library provides a means to round trip any code that can be compiled by GHC, currently excluding lhs files. It does this with a phased approach * Delta - converts GHC API Annotations into relative offsets, indexed by SrcSpan * Transform - functions to facilitate changes to the AST, adjusting the annotations generated in the Delta phase to suit the changes. * Print - converts an AST and its annotations to properly formatted source text. * Pretty - adds annotations to an AST (fragment) so that the output can be parsed back to the same AST. Note: requires GHC 7.10.2 or later.

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