7.7
Language creation
| (require syntax/lang) | package: syntax-lang |
This module provides forms for creating new #lang languages. It abstracts over several language-creation components such as syntax/module-reader, reader submodules, and #%module-begin. This library makes it easy to create simple one-off languages driven by a single macro.
syntax
(define-lang-syntax lang-collection-name module-body-syntax maybe-module-begin)
maybe-module-begin =
| #:module-begin | base-module-begin
Defines a reader submodule that implements a #lang that is equivalent
to racket/base, except that module-body-syntax wraps
all forms in the module. This must be used in the main.rkt file of the
collection directory lang-collection-name. For example, assuming this
is in the main file of a collection directory named display-syntax:
(define-syntax display-each-body-stx (syntax-parser [(_ body ...) #'(begin (displayln #'body) ...)]))
Then the following creates a #lang display-syntax that prints each
syntax object of the language when run:
(define-lang-syntax display-syntax display-each-body-stx)
If base-module-begin is provided, it is used as the
#%module-begin of the new language instead of the
#%module-begin from racket/base.