wiki:SyntaxDefinitions

These tests show the type of syntax definitions the Schemes in the suite understand. The following Schemes do not support syntax extension of any (known) kind, and are excluded below: NexJ, JScheme, KSi, Shoe, TinyScheme, BDC, XLisp, Schemik, UMB, Llava, FemtoLisp, Oaklisp, Inlab

Define-macro

Define-macro is a low-level bare macro definition, analogous to Common Lisp defmacro. I tested (define-macro x (lambda (y) y)) followed by (x (+ 3 4)), expecting it to return 7 on Schemes that support define-macro and an error otherwise. Define-macro is not part of any Scheme standard.

Supported: Gambit, Bigloo, Guile, Kawa, SISC, Ypsilon, SigScheme, S7[*], Scheme 9, STklos, RScheme, Rep, Elk, Dfsch[*], Picrin

Not supported: Racket, Gauche, MIT, Chicken, Scheme48/scsh, SCM, Chez, Vicare, Larceny, Mosh, IronScheme, SXM, Sagittarius, Foment, Owl Lisp, Chibi, Sizzle[*]

[*] S7 and Dfsch accept the define-style syntax (define-macro (x y) y) only. The Sizzle documentation claims to do the same, but it didn't work for me.

Define-syntax

Define-syntax is a wrapper for any of the following syntax transformations. Other such wrappers are let-syntax, let*-syntax, and letrec-syntax, which define local macros. The following additional Schemes do not support define-syntax and are excluded below: SigScheme, S7, Rep, Elk, Sizzle, Dfsch. RScheme accepts only a non-standard form of define-syntax and is also excluded below.

Syntax-rules

Syntax-rules is a syntax transformer used with define-syntax and its relatives. It was described but not standardized in R4RS; with minor extensions, it is part of the R5RS, R6RS, and R7RS-small standards. I tested (define-syntax x (syntax-rules () ((x y) y))), which is essentially equivalent to the define-macro macro used above, but with hygiene.

Supported: Racket, Gauche, MIT, Gambit (with the -:s switch), Chicken, Bigloo, Scheme48/scsh, Guile, Kawa, SISC, SCM (with the -r5 -m switches), Chez, Vicare, Larceny, Ypsilon, Mosh, IronScheme, STklos, Scheme 9, SXM, Sagittarius, Foment, Picrin, Owl Lisp, Chibi

Not supported: (none)

Syntax-case

Syntax-case is a hybrid low/high-level macro system that is standardized in R6RS. The test used here is (define-syntax x (lambda (x) (syntax-case x () ((x y) (syntax y))))), which is exactly equivalent to the syntax-rules macro used above.

Supported: Racket, Gambit, Guile, Kawa, SISC, Chez, Vicare, Larceny, Ypsilon, Mosh, IronScheme, SXM, Sagittarius

Not supported: Gauche, MIT, Chicken, Bigloo, Scheme48/scsh, SCM, STklos, Scheme 9, Foment, Picrin, Owl Lisp, Chibi

Syntactic closures

Syntactic closures is a low-level macro system supported by MIT, Picrin, Chibi.

Explicit renaming

Explicit renaming is a low-level macro system supported by MIT, Chicken, Sagittarius, Picrin, Chibi, Larceny (with different syntax).

Implicit renaming

Implicit renaming is a low-level macro system supported by Chicken, Picrin.

Last modified 12 months ago Last modified on 05/20/16 18:04:31