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write-you-a-haskell/chapter9/happy
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Stephen Diehl e48d07acd7 except handling for alex lexer
2015-12-13 17:30:02 -05:00
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README.md

Happy

A simple example use of the Happy/Alex toolchain to generate parsers.

To compile and run:

$ cabal run

Usage:

Happy> 42
Tokens: [TokenNum 42]
Syntax: Right (Lit (LInt 42))
42

Happy> (\x -> x) 1
Tokens: [TokenLParen,TokenLambda,TokenSym "x",TokenArrow,TokenSym "x",TokenRParen,TokenNum 1]
Syntax: Right (App (Lam "x" (Var "x")) (Lit (LInt 1)))
1

License

Released under MIT license.