define-record-and-printer

Outdated egg!

This is an egg for CHICKEN 4, the unsupported old release. You're almost certainly looking for the CHICKEN 5 version of this egg, if it exists.

If it does not exist, there may be equivalent functionality provided by another egg; have a look at the egg index. Otherwise, please consider porting this egg to the current version of CHICKEN.

define-record-and-printer

Trivial macro to define records and appropriate printers

TOC »

Outdated egg!
define-record-and-printer
- define-record-and-printer
- About this egg
  - Author
  - Repository
  - License
  - Dependencies
  - Versions
  - Colophon

define-record-and-printer

(define-record-and-printer name slotname) → recordsyntax

Define a record and a printer that shows the contents of the record as a vector; see define-record.

name: The name of the record
slotname: The name of the slot

(define-syntax
  define-record-and-printer
  (lambda (expression rename compare)
    (match expression
           ((_ record . fields)
            (let ((%define-record (rename 'define-record))
                  (%define-record-printer (rename 'define-record-printer))
                  (%begin (rename 'begin))
                  (%lambda (rename 'lambda))
                  (%write (rename 'write))
                  (%record->vector (rename 'record->vector)))
              `(,%begin
                (,%define-record ,record ,@fields)
                (,%define-record-printer
                 ,record
                 (,%lambda
                  (record out)
                  (,%write (,%record->vector record) out)))))))))