62 lines
1.4 KiB
ReStructuredText
62 lines
1.4 KiB
ReStructuredText
================
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define-namespace
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================
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DEFINE-NAMESPACE is an R5RS macro that implements a subset of R7RS's
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DEFINE-LIBRARY.
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-----
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Usage
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-----
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Syntax::
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(define-namespace namespace-name [DECL list])
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DECL ::= (define defbody ...)
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| (export [identifier list])
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| (import [IMPORTSPEC list])
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IMPORTSPEC ::= (only ns [identifier list])
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::= (rename ns [(identifier identifier) list]
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(import-from-namespace [IMPORTSPEC list])
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Example::
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(define-namespace ns
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(define param 5)
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(define (f x) (* 5 x))
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(export f))
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(define-namespace ns2
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(import (rename ns (f g)))
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(define (f x) (* 5 (g x)))
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(export f))
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(import-from-namespace (only ns2 f))
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(f 17)
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---------------------
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Differences from R7RS
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---------------------
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* There are only EXPORT, IMPORT, and BEGIN statements.
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* DEFINE-SYNTAX does not work.
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* EXPORT statements must occur after DEFINEs.
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* IMPORT only allows for ONLY and RENAME clauses.
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* Namespace names are identifers, not lists.
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* Namespaces are Scheme objects.
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* To import outside of namespaces, use IMPORT-FROM-NAMSPACE, not IMPORT.
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--------
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Examples
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--------
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* ``srfi/srfi-1.scm`` is the reference implementation of SRFI-1 wrapped in
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a namespace.
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* ``examples/aatree.scm`` is an imperative binary tree implementation.
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``examples/test-aatree.scm`` uses SRFI-64 to run some tests on the
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implementation. Requires SRFI-9 and SRFI-11 (``let-values``).
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