#9628: Add Annotations to the AST to simplify source to source conversions -------------------------------------+------------------------------------- Reporter: alanz | Owner: alanz Type: feature | Status: new request | Milestone: Priority: normal | Version: 7.9 Component: Compiler | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: | Related Tickets: None/Unknown | Test Case: | Blocking: | Differential Revisions: D297 | -------------------------------------+------------------------------------- Changes (by alanz): * differential: D246 => D297 * version: 7.8.3 => 7.9 Old description:
Two different kinds of annotation are proposed to be added to HsSyn
1. Additional elements to explictly track the location of all syntactic elements not currently tracked. In particular, locations of reserved words and punctuation.
2. A top-level type parameter that allows a tool-writer to thread an application-specific annotation through the syntax tree.
These two could potentially be merged, if the default annotation parameter is capable of tracking the first category of information.
Discussion of the feature is at GhcAstAnnotations
New description: Add Annotations to HsSyn to explicitly track the locations of all non- blank source code elements to allow tools to parse a Haskell file, modify the AST and then produce an updated version of the source preserving the layout for unchanged parts. Discussion of the feature is at GhcAstAnnotations Note: an early effort was at Phab:D297, but this was abandoned as unworkable. -- -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9628#comment:13 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler