macrotypes-nonstx

8.12

macrotypes-nonstx🔗ℹ

(require macrotypes-nonstx/expand-check-sugar)
	package: macrotypes-nonstx

syntax
(define-expand-check-relation name
  [in-parameter ... -> out-parameter ...]
  call-syntax
  input-syntax
  output-syntax
  #:in-stx in-parameter
  #:out-stx out-parameter
  #:stop-ids stop-ids-expr
  #:bad-output bad-output-expr)

call-syntax = [call-elem ...]

input-syntax = [input-elem ...]

output-syntax = [output-elem ...]

call-elem = in-parameter
| out-parameter
| literal-id

input-elem = in-parameter
| literal-id

output-elem = out-parameter
| literal-id

Defines name as an expand-check relation, which can be thought of as a type-check relation that checks a form by expanding it.

To expand-check a form using it, use:

(ec call-elem ...)

To define a macro that can be expand-checked by it, use:

(define-typed-syntax macro-name
  ....
  [name
   [input-elem ...]
   premise ...
   (er name output-elem ...)]
  ....)

syntax
(ec call-elem ...)

call-elem = in-argument-expr
| out-argument-pat
| literal-id

ec stands for "expand-check".

Calls the expand-check relation defined by the call-elems. The in-argument-exprs are expression positions while the out-argument-pats are match patterns.

syntax
(er ec-name output-elem ...)

output-elem = out-argument-expr
| literal-id

er stands for "expansion-result".

Combines the outputs of the expand-check relation ec-name into one value that can be returned from a macro. This is typically used as the result of a macro that uses define-typed-syntax:

(define-typed-syntax macro-name
  ....
  [ec-name
   [input-elem ...]
   premise ...
   (er ec-name output-elem ...)]
  ....)

syntax
(define-typed-syntax name clause ...)

clause =
[ec-name
[input-elem ...]
premise ...
(er ec-name output-elem ...)]

Defines name as a macro that can be typechecked by any of the ec-name expand-check relations from the clauses.