113 lines
5.2 KiB
Racket
113 lines
5.2 KiB
Racket
#lang scribble/doc
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@(require "utils.ss"
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(only-in scribble/decode make-splice))
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@title[#:tag "homogeneous-vectors"]{Safe Homogenous Vectors}
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@defmodule[ffi/vector]
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Homogenous vectors are similar to C vectors (see
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@secref["foreign:cvector"]), except that they define different types
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of vectors, each with a hard-wired type. An exception is the
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@schemeidfont{u8} family of bindings, which are just aliases for
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byte-string bindings; for example, @scheme[make-u8vector] is an alias
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for @racket[make-bytes].
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@(begin
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(require (for-syntax scheme/base))
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(define-syntax (srfi-4-vector stx)
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(syntax-case stx ()
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[(_ id elem)
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#'(srfi-4-vector/desc id elem make-splice
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"Like " (scheme make-vector) ", etc., but for " (scheme elem) " elements.")]))
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(define-syntax (srfi-4-vector/desc stx)
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(syntax-case stx ()
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[(_ id elem extra desc ...)
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(let ([mk
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(lambda l
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(datum->syntax
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#'id
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(string->symbol
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(apply string-append
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(map (lambda (i)
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(if (identifier? i)
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(symbol->string (syntax-e i))
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i))
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l)))
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#'id))])
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(with-syntax ([make (mk "make-" #'id "vector")]
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[vecr (mk #'id "vector")]
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[? (mk #'id "vector?")]
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[length (mk #'id "vector-length")]
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[ref (mk #'id "vector-ref")]
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[! (mk #'id "vector-set!")]
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[list-> (mk "list->" #'id "vector")]
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[->list (mk #'id "vector->list")]
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[->cpointer (mk #'id "vector->cpointer")]
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[_vec (mk "_" #'id "vector")])
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#`(begin
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(defproc* ([(make [len exact-nonnegative-integer?]) ?]
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[(vecr [val number?] (... ...)) ?]
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[(? [v any/c]) boolean?]
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[(length [vec ?]) exact-nonnegative-integer?]
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[(ref [vec ?] [k exact-nonnegative-integer?]) number?]
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[(! [vec ?] [k exact-nonnegative-integer?] [val number?]) void?]
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[(list-> [lst (listof number?)]) ?]
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[(->list [vec ?]) (listof number?)]
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[(->cpointer [vec ?]) cpointer?])
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desc ...
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(extra
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(list
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" The " (scheme ->cpointer) " function extracts a plain pointer to the underlying array.")))
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;; Big pain: make up relatively-correct source locations
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;; for pieces in the _vec definition:
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(defform* [#,(datum->syntax
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#'_vec
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(cons #'_vec
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(let loop ([l '(mode maybe-len)]
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[col (+ (syntax-column #'_vec)
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(syntax-span #'_vec)
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1)]
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[pos (+ (syntax-position #'_vec)
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(syntax-span #'_vec)
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1)])
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(if (null? l)
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null
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(let ([span (string-length (symbol->string (car l)))])
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(cons (datum->syntax
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#'_vec
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(car l)
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(list (syntax-source #'_vec)
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(syntax-line #'_vec)
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col
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pos
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span))
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(loop (cdr l)
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(+ col 1 span)
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(+ pos 1 span)))))))
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(list (syntax-source #'_vec)
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(syntax-line #'_vec)
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(sub1 (syntax-column #'vec))
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(sub1 (syntax-position #'vec))
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10))
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_vec]
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"Like " (scheme _cvector) ", but for vectors of " (scheme elem) " elements."))))])))
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@srfi-4-vector/desc[u8 _uint8 (lambda (x) (make-splice null))]{
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Like @scheme[_cvector], but for vectors of @scheme[_byte] elements. These are
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aliases for @schemeidfont{byte} operations, where @racket[u8vector->cpointer]
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is the identity function.}
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@srfi-4-vector[s8 _int8]
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@srfi-4-vector[s16 _int16]
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@srfi-4-vector[u16 _uint16]
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@srfi-4-vector[s32 _int32]
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@srfi-4-vector[u32 _uint32]
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@srfi-4-vector[s64 _int64]
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@srfi-4-vector[u64 _uint64]
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@srfi-4-vector[f32 _float]
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@srfi-4-vector[f64 _double*]
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