Welcome to Happy’s documentation!

Contents

• Introduction
  • Compatibility
  • Reporting Bugs
  • License
  • Acknowledgements
• Obtaining Happy
  • Haskell-specific way
  • Operating System way
• Using Happy
  • Returning other datatypes
  • Parsing sequences
  • Using Precedences
  • Type Signatures
  • Monadic Parsers
  • The Error Token
  • Resumptive parsing with catch
  • Generating Multiple Parsers From a Single Grammar
• Generalized LR Parsing
  • Introduction
  • Basic use of a Happy-generated GLR parser
  • Including semantic results
• Attribute Grammars
  • Introduction
  • Attribute Grammars in Happy
  • Limits of Happy Attribute Grammars
  • Example Attribute Grammars
• Invoking Happy
• Syntax of Grammar Files
  • Lexical Rules
  • Module Header
  • Directives
  • Reporting expected tokens
  • Grammar
  • Module Trailer
• Info Files
  • States
  • Interpreting conflicts
• Tips
  • Performance Tips
  • Compilation-Time Tips
  • Finding Type Errors
  • Conflict Tips
  • Using Happy with GHCi
  • Basic monadic Happy use with Alex
• Contributing to Happy
  • Source Code Repository
  • Repo Layout
  • Build Instructions

Indices and tables

• Index

• Search Page