Crate wagon_macros

Procedural macros for use in the WAGon suite of libraries.

It would make more sense to put these in the wagon-utils crate. But Rust does not allow use to export procedural macros and regular functions from the same crate. So here we are.

Macros

• match_error
  Automatically return a parse error if an unexpected token is encountered.
• unspanned_tree
  Given a hand-written, complete [wagon-parser::Wag] without any Span information, creates a proper one with dummy Span data.

Attribute Macros

• inherit_from_base
  A procedural macro to extend lexers from a base lexer. Used by wagon-lexer::math::Math and wagon-lexer::productions::Productions.
• new_unspanned
  Given a struct/enum with wagon-parser::SpannableNode fields, creates constructors which do not require any SpannableNode wrapping.

Derive Macros

• TokenMapper
  Derive macro for the wagon-parser::helpers::TokenMapper trait.
• ValueAdd
  Automatically derive this operation for wagon-value::Valueable types.
• ValueDiv
  Automatically derive this operation for wagon-value::Valueable types.
• ValueMul
  Automatically derive this operation for wagon-value::Valueable types.
• ValueOps
  Automatically derive all value operations
• ValuePow
  Automatically derive this operation for wagon-value::Valueable types.
• ValueRem
  Automatically derive this operation for wagon-value::Valueable types.
• ValueSub
  Automatically derive this operation for wagon-value::Valueable types.