yuni

R7RS/R6RS/Generic Scheme portability platform

yuni is a portability layer for Scheme applications that would allow to run single program/library on various Scheme implementations (with some limitations). It's under development; still USELESS for most people.

Libraries

• (yuni scheme) - Subset of R7RS base library, also available on R6RS.
• (yuni core) - Basic structure and typing
• (yuni ffi *) - Static binding FFI (under construction)

Language Features and Limitations

In short, yuni provides subset of R6RS library loader and subset of R7RS base libraries. On the other hand, Yuni does not try to fill implementation limitations.

See also: Basic library sample

Features

• Common: Minimalistic common FFI implementation (TBD)
• For R6RS: R7RS base libraries including SRFI-46 syntax-rules
• For R7RS: R6RS-lite library loader that can convert R6RS library form into load or define-library form (if supported)
• For Generic Scheme with define-macro: R7RS base libraries and non-hygienic syntax-rules and library implementation

Limitations

Yuni is NOT designed for writing any benchmarks. Library wrapper can kill some form of optimizations which can be critical for performance.

See also: SIBR is Yuni's collection of Scheme implementation behaviour reports

• FFI implementation is incomplete
• No rename on library form, especially Generic Scheme does not support renaming syntax such as let or define
• Some Scheme might not have R6RS/R7RS features; such as full numeric-tower, tail-calls, eval, etc

Getting Started

(Not ready yet.)

Implementations

See also: PortingNotes

Implementations with FFI compatibility layer:

• chibi-scheme
• Racket with srfi-lib and r6rs-lib packages
• Sagittarius
• Gauche 0.9.5 or later
• Guile 2.0 or later
• Chicken interpreter with r7rs egg
• Gambit
• ChezScheme

Bootstrapped, but no FFI yet:

• IronScheme
• Kawa 2.2 or later
• Digamma
• Cyclone (experimental)
• Foment
• MIT/GNU Scheme
• BiwaScheme (experimental)
• s7
• STklos
• SCM with slib (experimental)
• Bigloo (experimental)

(Support was temporally removed for now):

• nmosh
• Vicare
• Larceny
• Picrin with yuniffi patch

License

Public domain (CC0-1.0). Yuni R6RS/R7RS runtime component is released into public domain by the author. See COPYING.CC0 for full license text.

Yuni generic scheme support includes syntax-rules implementation from Chibi-scheme.

NOTE: Following directories contain copyrighted materials from other projects.

• apidata
• external
• integration
• tests

These directories are not part of Yuni runtime library.