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Happy is a parser generator for Haskell. Given a grammar specification in BNF, Happy generates Haskell code to parse the grammar. Happy works in a similar way to the yacc tool for C. This library provides the following functionality: Data type definitions for the Grammar AST type, capturing the information in .y-files (Happy.Grammar) A parser for happy grammar files (.y) to produce a Grammar (Happy.Frontend.*) Implementations of the text book algorithms that compute the LR action and goto tables for the given Grammar (Happy.Tabular.*) An LALR code generator to produce table-driven, deterministic parsing code in Haskell (Happy.Backend.LALR.*) A (less maintained) GLR code generator to produce table-driven, non-deterministic parsing code in Haskell, where ambiguous parses produce multiple parse trees (Happy.Backend.GLR.*)
cabal install happy-lib-2.1