ac26fe7554
Also, updates some of the mzlib files to point at `racket/*' libraries rather than to `scheme/*' ones.
137 lines
4.9 KiB
Racket
137 lines
4.9 KiB
Racket
#lang scribble/manual
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@(require "../utils.rkt"
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(for-label racket/gui
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drracket/tool-lib
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unstable/gui/language-level))
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@title{DrRacket Language Levels}
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@defmodule[unstable/gui/language-level]
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@unstable[@author+email["Carl Eastlund" "cce@racket-lang.org"]]
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@defthing[language-level@ unit?]{
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This unit imports @racket[drracket:tool^] and exports @racket[language-level^].
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}
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@defsignature[language-level^ ()]{
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@defproc[(make-language-level
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[name string?]
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[path module-path?]
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[mixin (-> class? class?)] ...
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[#:number number integer? ...]
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[#:hierarchy hierarchy (listof (cons/c string? integer?)) ...]
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[#:summary summary string? name]
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[#:url url (or/c string? #f) #f]
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[#:reader reader
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(->* [] [any/c input-port?] (or/c syntax? eof-object?))
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read-syntax])
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(is-a?/c drracket:language:language<%>)]{
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Constructs a language level as an instance of
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@racket[drracket:language:language<%>] with the given @racket[name] based on the
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language defined by the module at @racket[path]. Applies
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@racket[(drracket:language:get-default-mixin)] and the given @racket[mixin]s to
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@sigelem[language-level^ simple-language-level%] to construct the class, and
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uses the optional keyword arguments to fill in the language's description and
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reader.
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}
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@defthing[simple-language-level%
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(and/c (implementation?/c drracket:language:language<%>)
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(implementation?/c drracket:language:module-based-language<%>)
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(implementation?/c drracket:language:simple-module-based-language<%>))]{
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Equal to
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@racket[
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(drracket:language:module-based-language->language-mixin
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(drracket:language:simple-module-based-language->module-based-language-mixin
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drracket:language:simple-module-based-language%))].
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}
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@defproc[(language-level-render-mixin [to-sexp (-> any/c any/c)]
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[show-void? boolean?])
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(make-mixin-contract drracket:language:language<%>)]{
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Produces a mixin that overrides @method[drracket:language:language<%>
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render-value/format] to apply @racket[to-sexp] to each value before printing it,
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and to skip @racket[void?] values (pre-transformation) if @racket[show-void?] is
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@racket[#f].
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}
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@defproc[(language-level-capability-mixin [dict dict?])
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(make-mixin-contract drracket:language:language<%>)]{
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Produces a mixin that augments @method[drracket:language:language<%>
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capability-value] to look up each key in @racket[dict], producing the
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corresponding value if the key is found and deferring to @racket[inner]
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otherwise.
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}
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@defthing[language-level-no-executable-mixin
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(make-mixin-contract drracket:language:language<%>)]{
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Overrides @method[drracket:language:language<%> create-executable] to print an
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error message in a dialog box.
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}
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@defthing[language-level-eval-as-module-mixin
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(make-mixin-contract drracket:language:language<%>
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drracket:language:module-based-language<%>)]{
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Overrides @method[drracket:language:language<%> front-end/complete-program] to
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wrap terms from the definition in a module based on the language level's
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definition module. This duplicates the behavior of the HtDP teaching languages,
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for instance.
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}
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@defthing[language-level-macro-stepper-mixin
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(make-mixin-contract drracket:language:language<%>)]{
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This mixin enables the macro stepper for its language level.
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}
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@defthing[language-level-check-expect-mixin
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(make-mixin-contract drracket:language:language<%>)]{
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This mixin overrides @method[drracket:language:language<%> on-execute] to set up
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the @racket[check-expect] test engine to a language level similarly to the HtDP
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teaching languages.
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}
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@defproc[(language-level-metadata-mixin
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[reader-module module-path?]
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[meta-lines exact-nonnegative-integer?]
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[meta->settings (-> string? any/c any/c)]
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[settings->meta (-> symbol? any/c string?)])
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(make-mixin-contract drracket:language:language<%>)]{
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This mixin constructs a language level that stores metadata in saved files
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allowing Drracket to automatically switch back to this language level upon
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opening them. It overrides @method[drracket:language:language<%>
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get-reader-module], @method[drracket:language:language<%> get-metadata],
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@method[drracket:language:language<%> metadata->settings], and
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@method[drracket:language:language<%> get-metadata-lines].
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The resulting language level uses the reader from @racket[reader-module], and is
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recognized in files that start with a reader directive for that module path
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within the first @racket[meta-lines] lines. Metadata about the language's
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settings is marshalled between a string and a usable value (based on a default
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value) by @racket[meta->settings], and between a usable value for a current
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module (with a symbolic name) by @racket[settings->meta].
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}
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}
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