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modules

A simple module system for use with the low-level (define-macro) macro system. Import and export of macros is not allowed, and importing bindings from other modules may only take place inside a module form.

In combination with the -emit-exports compiler option, this module system provides some minimal interoperability with the (much more powerful) module system provided by the syntax-case extension.

module

 
[syntax] (module [NAME] (EXPORT ...) BODY ...)

Defines a named or anonymous module. The EXPORTs should be identifiers and name bindings exported by this module. The bindings must be defined (using define) in BODY, either at it's toplevel or nested in begin forms. If an exported binding is not defined, an error will be signalled. All other toplevel bindings defined in BODY will be hidden and not be accessible from outside of this module.

Definitions recognized are any of the following:

(define ID VAL)
(define (ID . LLIST) BODY ...)
(define-values (ID ...) VAL)
(include FILENAME)                ; recursively expands body

import

 
[syntax] (import NAME)

Imports exported bindings from the module with the name NAME. If a module with the required name was previously defined, then all the following expressions may access the imported bindings. If no module is known under this name, then an installed extension will be searched that exports identifiers that are qualified with NAME. If no such extension can be found, then a file named NAME.exports will be searched in the current include-path and qualified identifiers from it will be extracted. If either an installed extension or an .exports file doesn't list any qualified export, then an error will be signalled.

If used inside a module form, then the imported bindings will only be accessible inside the lexical scope of the module. If used outside of a module form, then the values of imported bindings will be assigned to toplevel variables of the same name, overwriting any existing bindings.

export-toplevel

 
[syntax] (export-toplevel IDENTIFIER ...)

Exports the values given by the (possibly non-exported) module bindings IDENTIFIER ... as toplevel variables of the same name. IDENTIFIER may also be of the form (IDENTIFIER EXPORT), which exports the module binding IDENTIFIER as toplevel variable EXPORT.

Authors

felix winkelmann

Requirements

codewalk

miscmacros

License

 
Copyright (c) 2006, Felix L. Winkelmann
All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following
conditions are met:
  Redistributions of source code must retain the above copyright notice, this list of conditions and the following
    disclaimer. 
  Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
    disclaimer in the documentation and/or other materials provided with the distribution. 
  Neither the name of the author nor the names of its contributors may be used to endorse or promote
    products derived from this software without specific prior written permission. 
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.

Version History
0.1
import is now also allowed outside of module form
0.1
initial release