• Alec Theriault's avatar
    'DynFlag'-free version of 'mkParserFlags' · 469fe613
    Alec Theriault authored
    This is a fixed version of the reverted d2fbc33c
    and  5aa29231.
    Obtaining a `DynFlags` is difficult, making using the lexer/parser
    for pure parsing/lexing unreasonably difficult, even with `mkPStatePure`.
    This is despite the fact that we only really need
        * language extension flags
        * warning flags
        * a handful of boolean options
    The new `mkParserFlags'` function makes is easier to directly construct a
    `ParserFlags`. Furthermore, since `pExtsBitmap` is just a footgun, I've gone
    ahead and made `ParserFlags` an abstract type.
    Also, we now export `ExtBits` and `getBit` instead of defining/exporting a
    bunch of boilerplate functions that test for a particular 'ExtBits'.
    In the process, I also
      * cleaned up an unneeded special case for `ITstatic`
      * made `UsePosPrags` another variant of `ExtBits`
      * made the logic in `reservedSymsFM` match that of `reservedWordsFM`
    Test Plan: make test
    Reviewers: bgamari, alanz, tdammers
    Subscribers: sjakobi, tdammers, rwbarton, mpickering, carter
    GHC Trac Issues: #11301
    Differential Revision: https://phabricator.haskell.org/D5405
Lexer.x 119 KB