65 lines
1.6 KiB
Racket
65 lines
1.6 KiB
Racket
#lang scribble/doc
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@(require "common.ss")
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@(define-syntax-rule (go)
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(begin
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(require (for-label syntax/module-reader))
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@begin{
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@title[#:tag "module-reader"]{Module Reader}
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@defmodule[syntax/module-reader]
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The @schememodname[syntax/module-reader] language provides support
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for defining @hash-lang[] readers.
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@defform[(#%module-begin module-path)]{
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Causes a module written in the @schememodname[syntax/module-reader]
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language to define and provide @schemeidfont{read} and
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@schemeidfont{read-syntax} functions, making the module an
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implementation of a reader. In particular, the exported reader
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functions read all S-expressions until an end-of-file, and it packages
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them into a new module in the @scheme[module-path] language.
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That is, a module @scheme[_something]@scheme[/lang/reader] implemented
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as
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@schemeblock[
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(module reader module-syntax/module-reader
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module-path)
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]
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creates a reader that converts @scheme[#, @hash-lang[] _something]
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into
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@schemeblock[
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(module _name-id module-path
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....)
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]
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where @scheme[_name-id] is derived from the name of the port used by
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the reader.
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For example, @scheme[scheme/base/lang/reader] is implemented as
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@schemeblock[
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(module reader module-syntax/module-reader
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scheme/base)
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]}
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@defproc[(wrap-read-all [mod-path module-path?]
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[in input-port?]
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[read (input-port . -> . any/c)])
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any/c]{
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Repeatedly calls @scheme[read] on @scheme[in] until an end of file,
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collecting the results in order into @scheme[_lst], and derives a
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@scheme[_name-id] from @scheme[(object-name in)]. The result is
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@schemeblock[
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`(module ,_name-id ,mod-path ,@_lst)
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]}
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}))
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@(go)
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