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Package: frown-doc (0.6.2.3-2)

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Experimental package

Warning: This package is from the staging distribution. That means it is likely unstable or buggy, and it may even cause data loss. Please be sure to consult the changelog and other possible documentation before using it. The package will automatically migrate to the current development distribution, when it has been tested.

LALR(k) parser generator -- documentation

Frown is an LALR(k) parser generator for Haskell 98 written in Haskell 98.

Its salient features are:

   -  The generated parsers are time and space efficient. On the downside, the
      parsers are quite large.
   -  Frown generates four different types of parsers. as a common
      characteristic, the parsers are genuinely functional (ie ‘table-free’);
      the states of the underlying LR automaton are encoded as mutually
      recursive functions. Three output formats use a typed stack
      representation, and one format due to Ross Paterson (code=stackless)
      works even without a stack.
   -  Encoding states as functions means that each state can be treated
      individually as opposed to a table-driven approach, which necessitates a
      uniform treatment of states. For instance, look-ahead is only used when
      necessary to resolve conflicts.
   -  Frown comes with debugging and tracing facilities; the standard output
      format due to Doaitse Swierstra (code=standard) may be useful for
      teaching LR parsing.
   -  Common grammatical patterns such as repetition of symbols can be
      captured using rule schemata. There are several predefined rule
      schemata.
   -  Terminal symbols are arbitrary variable-free Haskell patterns or guards.
      Both terminal and nonterminal symbols may have an arbitrary number of
      synthesized attributes.
   -  Frown comes with extensive documentation; several example grammars are
      included. Furthermore, Frown supports the use of monadic lexers, monadic
      semantic actions, precedences, and associativity, the generation of
      backtracking parsers, multiple start symbols, error reporting, and a
      weak form of error correction.

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Architecture Package Size Installed Size Files
all 461.8 kB3,330.0 kB [list of files]