1.3 Release Notes🔗ℹ

This package is periodically released as a package on the package server with a versioned package and collection name, like syntax-spec-dev. The unversioned package name syntax-spec is used for the current unstable development version.

Breaking changes may occur between differently-named versions. This page documents the history of breaking changes. Other new features are not mentioned here.

The version used in the paper "Compiled, Extensible, Multi-language DSLs (Functional Pearl)" was syntax-spec-v2.

Version 3🔗ℹ

Binding specifications now require ellipses matching the ellipsis depth of pattern variables in the syntax spec. See the PR description for more details.

With this change the new nest syntax accomplishes the behavior of the old nest syntax when the first form is followed by ellipses and the behavior of the old nest-one syntax when no ellipses are used.

Reference compilers are now specified as part of binding class declarations, rather than with with-reference-compilers. If you previously used with-reference-compilers to create reference compilers with contextual behavior, you can typically use syntax parameters to accomplish the same with the new design.

Version 2🔗ℹ

Some forms were renamed:

Scopes in binding specifications are now indicated by the scope form rather than {} curly braces.

Reference compilers are now invoked at application forms like (x y z) where x is the DSL reference. Use make-variable-like-reference-compiler if you only want to transform references in reference or set! positions.