7d50e61c7f
* Another big chunk of v4-require-isms * Allow `#lang framework/keybinding-lang' for keybinding files * Move hierlist sources into "mrlib/hierlist", leave stub behind svn: r10689
720 lines
30 KiB
Scheme
720 lines
30 KiB
Scheme
(module stepper-tool mzscheme
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(require mzlib/contract
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drscheme/tool
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mred
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mzlib/pconvert
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string-constants
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mzlib/async-channel
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(prefix frame: framework)
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mzlib/unit
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mzlib/class
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mzlib/list
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mrlib/switchable-button
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(prefix model: "private/model.ss")
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"private/my-macros.ss"
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(prefix x: "private/mred-extensions.ss")
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"private/shared.ss"
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"private/model-settings.ss"
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lang/stepper-language-interface
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"xml-sig.ss")
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(provide stepper-tool@
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make-print-convert-hook
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set-print-settings
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simple-module-based-language-convert-value)
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(define-unit stepper-tool@
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(import drscheme:tool^ xml^)
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(export drscheme:tool-exports^)
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;; tool magic here:
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(define (phase1)
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;; experiment with extending the language... parameter-like fields for stepper parameters
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(drscheme:language:extend-language-interface
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stepper-language<%>
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(lambda (superclass)
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(class* superclass (stepper-language<%>)
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(public stepper:supported?)
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(define (stepper:supported?) #f)
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(public stepper:enable-let-lifting?)
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(define (stepper:enable-let-lifting?) #f)
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(public stepper:show-lambdas-as-lambdas?)
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(define (stepper:show-lambdas-as-lambdas?) #t)
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(public stepper:render-to-sexp)
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(define (stepper:render-to-sexp val settings language-level)
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(parameterize ([current-print-convert-hook
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(make-print-convert-hook settings)])
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(set-print-settings
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language-level
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settings
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(lambda ()
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(simple-module-based-language-convert-value
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val
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(drscheme:language:simple-settings-printing-style settings)
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(drscheme:language:simple-settings-show-sharing settings))))))
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(super-instantiate ())))))
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(define (phase2) (void))
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;; this should be a preference:
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(define stepper-initial-width 500)
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(define stepper-initial-height 500)
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(define drscheme-eventspace (current-eventspace))
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(define (extract-language-level definitions-text)
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(settings->language-level (definitions-text->settings definitions-text)))
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(define (definitions-text->settings definitions-text)
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(send definitions-text get-next-settings))
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(define (settings->language-level settings)
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(drscheme:language-configuration:language-settings-language settings))
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(define (stepper-works-for? language-level)
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(or (send language-level stepper:supported?)
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(getenv "PLTSTEPPERUNSAFE")))
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;; the stepper's frame:
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(define stepper-frame%
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(class (drscheme:frame:basics-mixin
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(frame:frame:standard-menus-mixin frame:frame:basic%))
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(init-field drscheme-frame)
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;; PRINTING-PROC
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;; I frankly don't think that printing (i.e., to a printer) works
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;; correctly. 2005-07-01, JBC
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(public set-printing-proc)
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(define (set-printing-proc proc)
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(set! printing-proc proc))
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(define (printing-proc item evt)
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(message-box "error?" "shouldn't be called"))
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(define/private (file-menu:print a b) (printing-proc a b))
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;; MENUS
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(define/override (edit-menu:between-find-and-preferences edit-menu)
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(void))
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(define/override (edit-menu:between-select-all-and-find edit-menu)
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(void))
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(define/override (file-menu:between-save-as-and-print file-menu)
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(void))
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;; CUSTODIANS
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;; The custodian is used to halt the stepped computation when the
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;; stepper window closes. The custodian is captured when the stepped
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;; computation starts.
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(define custodian #f)
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(define/public (set-custodian! cust)
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(set! custodian cust))
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(define/augment (on-close)
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(when custodian
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(custodian-shutdown-all custodian))
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(send drscheme-frame on-stepper-close)
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(inner (void) on-close))
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;; WARNING BOXES:
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(define program-changed-warning-str
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(string-constant stepper-program-has-changed))
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(define window-closed-warning-str
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(string-constant stepper-program-window-closed))
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(define warning-message-visible-already #f)
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(define/private (add-warning-message warning-str)
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(let ([warning-msg (new x:stepper-warning%
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[warning-str warning-str]
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[parent (get-area-container)])])
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(send (get-area-container)
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change-children
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(if warning-message-visible-already
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(lambda (l)
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(list (car l) warning-msg (caddr l)))
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(lambda (l)
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(list (car l) warning-msg (cadr l)))))
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(set! warning-message-visible-already #t)))
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(inherit get-area-container)
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(define program-change-already-warned? #f)
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(define/public (original-program-changed)
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(unless program-change-already-warned?
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(set! program-change-already-warned? #t)
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(add-warning-message program-changed-warning-str)))
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(define/public (original-program-gone)
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(add-warning-message window-closed-warning-str))
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(super-new [label "Stepper"] [parent #f]
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[width stepper-initial-width]
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[height stepper-initial-height])))
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;; view-controller-go: called when the stepper starts; starts the
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;; stepper's view&controller
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;; drscheme-frame : the drscheme frame which is starting the stepper
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;; program-expander : see "model.ss" for the contract on a
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;; program-expander
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;; -> returns the new frame%
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(define (view-controller-go drscheme-frame program-expander)
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;; get the language-level name:
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(define language-settings (definitions-text->settings (send drscheme-frame get-definitions-text)))
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(define language-level
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(settings->language-level language-settings))
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(define language-level-name
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(language-level->name language-level))
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;; VALUE CONVERSION CODE:
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(define simple-settings
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(drscheme:language-configuration:language-settings-settings
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language-settings))
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;; render-to-string : TST -> string
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(define (render-to-string val)
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(let ([string-port (open-output-string)])
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(send language-level render-value val simple-settings string-port)
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(get-output-string string-port)))
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;; render-to-sexp : TST -> sexp
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(define (render-to-sexp val)
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(send language-level stepper:render-to-sexp val simple-settings language-level))
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;; channel for incoming views
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(define view-channel (make-async-channel))
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;; the semaphore associated with the view at the end of the
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;; view-history note that because these are fresh semaphores for every
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;; step, posting to a semaphore multiple times is no problem.
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(define release-for-next-step #f)
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;; the list of available views
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(define view-history null)
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;; the view in the stepper window
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(define view 0)
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;; whether the stepper is waiting for a new view to become available
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;; (initially 'waiting-for-any-step)
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;; possible values: #f, 'waiting-for-any-step, 'waiting-for-application, 'waiting-for-end
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(define stepper-is-waiting? 'waiting-for-any-step)
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;; hand-off-and-block : (-> text%? boolean? void?)
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;; hand-off-and-block generates a new semaphore, hands off a thunk to
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;; drscheme's eventspace, and blocks on the new semaphore. The thunk
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;; adds the text% to the waiting queue, and checks to see if the
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;; stepper is waiting for a new step. If so, takes that new text% out
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;; of the queue and puts it on the list of available ones. If the
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;; stepper is waiting for a new step, it checks to see whether this is
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;; of the kind that the stepper wants. If so, display it. otherwise,
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;; release the stepped program to continue execution.
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(define (hand-off-and-block step-text step-kind)
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(let ([new-semaphore (make-semaphore)])
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(run-on-drscheme-side
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(lambda ()
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(async-channel-put view-channel
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(list step-text new-semaphore step-kind))
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(when stepper-is-waiting?
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(let ([try-get (async-channel-try-get view-channel)])
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(unless try-get
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(error
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'check-for-stepper-waiting
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"queue is empty, even though a step was just added"))
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(add-view-triple try-get)
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(if (right-kind-of-step? (caddr try-get))
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;; got the desired step; show the user:
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(begin (set! stepper-is-waiting? #f)
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(update-view/existing (- (length view-history) 1)))
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;; nope, keep running:
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(begin (en/dis-able-buttons)
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(semaphore-post new-semaphore)))))))
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(semaphore-wait new-semaphore)))
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;; run-on-drscheme-side : runs a thunk in the drscheme eventspace.
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;; Passed to 'go' so that display-break-stuff can work. This would be
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;; cleaner with two-way provides.
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(define (run-on-drscheme-side thunk)
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(parameterize ([current-eventspace drscheme-eventspace])
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(queue-callback thunk)))
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;; right-kind-of-step? : (boolean? . -> . boolean?)
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;; is this step the kind of step that the gui is waiting for?
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(define (right-kind-of-step? step-kind)
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(case stepper-is-waiting?
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[(waiting-for-any-step) #t]
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[(waiting-for-application)
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(or (eq? step-kind 'user-application)
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(eq? step-kind 'finished-stepping))]
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[(waiting-for-end)
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(or (eq? step-kind 'finished-stepping))]
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[(#f) (error 'right-kind-of-step
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"this code should be unreachable with stepper-is-waiting? set to #f")]
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[else (error 'right-kind-of-step
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"unknown value for stepper-is-waiting?: ~a"
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stepper-is-waiting?)]))
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;; add-view-triple : set the release-semaphore to be the new one, add
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;; the view to the list.
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(define (add-view-triple view-triple)
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(set! release-for-next-step (cadr view-triple))
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(set! view-history (append view-history
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(list (list (car view-triple)
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(caddr view-triple))))))
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;; find-later-step : given a predicate on history-entries, search through
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;; the history for the first step that satisfies the predicate and whose
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;; number is greater than n
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(define (find-later-step p n)
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(let loop ([step 0]
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[remaining view-history])
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(cond [(null? remaining) #f]
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[(and (> step n) (p (car remaining))) step]
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[else (loop (+ step 1) (cdr remaining))])))
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(define (find-later-application-step n)
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(find-later-step application-step? n))
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(define (find-later-finished-stepping-step n)
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(find-later-step finished-stepping-step? n))
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(define (find-later-any-step n)
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(find-later-step (lambda (x) #t) n))
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;; is this an application step?
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(define (application-step? history-entry)
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(case (cadr history-entry)
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[(user-application finished-stepping) #t]
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[else #f]))
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;; is this the finished-stepping step?
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(define (finished-stepping-step? history-entry)
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(case (cadr history-entry)
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[(finished-stepping) #t]
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[else #f]))
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;; build gui object:
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;; home : the action of the 'home' button
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(define (home)
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(set! stepper-is-waiting? #f)
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(update-view/existing 0))
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;; next-of-specified-kind: if the desired step is already in the list, display
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;; it; otherwise, wait for it.
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(define (next-of-specified-kind find-step right-kind? wait-for-it-flag)
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(set! stepper-is-waiting? #f)
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(let ([found-step (find-step view)])
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(if found-step
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(update-view/existing found-step)
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(begin
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;; each step has its own semaphore, so releasing one twice is
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;; no problem.
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(semaphore-post release-for-next-step)
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(when stepper-is-waiting?
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(error 'try-to-get-view
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"try-to-get-view should not be reachable when already waiting for new step"))
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(let ([try-get (async-channel-try-get view-channel)])
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(when try-get
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(add-view-triple try-get))
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(if (and try-get (right-kind? (list-ref view-history (+ view 1))))
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(update-view/existing (+ view 1))
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(begin
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(set! stepper-is-waiting? wait-for-it-flag)
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(en/dis-able-buttons))))))))
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;; respond to a click on the "next" button
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(define (next)
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(next-of-specified-kind find-later-any-step
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(lambda (x) #t)
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'waiting-for-any-step))
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;; respond to a click on the "next application" button
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(define (next-application)
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(next-of-specified-kind find-later-application-step
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application-step?
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'waiting-for-application))
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;; respond to a click on the "jump to end" button
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(define (jump-to-end)
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(next-of-specified-kind find-later-finished-stepping-step
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finished-stepping-step?
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'waiting-for-end))
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;; previous : the action of the 'previous' button
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(define (previous)
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(set! stepper-is-waiting? #f)
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(when (= view 0)
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(error 'previous-application
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"previous-step button should not be enabled in view zero."))
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(update-view/existing (- view 1)))
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;; previous-application : the action of the 'previous-application'
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;; button
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(define (previous-application)
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(set! stepper-is-waiting? #f)
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(when (= view 0)
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(error 'previous-application
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"previous-application button should not be enabled in view zero."))
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(let loop ([new-view (- view 1)])
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(cond [(= new-view 0)
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(update-view/existing new-view)]
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[(application-step? (list-ref view-history new-view))
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(update-view/existing new-view)]
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[else (loop (sub1 new-view))])))
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;; GUI ELEMENTS:
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(define s-frame
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(make-object stepper-frame% drscheme-frame))
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(define button-panel
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(make-object horizontal-panel% (send s-frame get-area-container)))
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(define (add-button name fun)
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(make-object button% name button-panel (lambda (_1 _2) (fun))))
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(define home-button (add-button (string-constant stepper-home) home))
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(define previous-application-button (add-button (string-constant stepper-previous-application) previous-application))
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(define previous-button (add-button (string-constant stepper-previous) previous))
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(define next-button (add-button (string-constant stepper-next) next))
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(define next-application-button (add-button (string-constant stepper-next-application) next-application))
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(define jump-to-end-button (add-button (string-constant stepper-jump-to-end) jump-to-end))
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(define canvas
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(make-object x:stepper-canvas% (send s-frame get-area-container)))
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;; update-view/existing : set an existing step as the one shown in the
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;; frame
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(define (update-view/existing new-view)
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(set! view new-view)
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(let ([e (car (list-ref view-history view))])
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(send e begin-edit-sequence)
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(send canvas set-editor e)
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(send e reset-width canvas)
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(send e set-position (send e last-position))
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(send e end-edit-sequence))
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(en/dis-able-buttons))
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;; en/dis-able-buttons : set enable & disable the stepper buttons,
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;; based on view-controller state
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(define (en/dis-able-buttons)
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(let* ([can-go-back? (> view 0)])
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(send previous-button enable can-go-back?)
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(send previous-application-button enable can-go-back?)
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(send home-button enable can-go-back?)
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(send next-button
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enable (or (find-later-any-step view)
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(not stepper-is-waiting?)))
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(send next-application-button
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enable (or (find-later-application-step view)
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(not stepper-is-waiting?)))
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(send jump-to-end-button
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enable (or (find-later-finished-stepping-step view)
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(not stepper-is-waiting?)))))
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(define (print-current-view item evt)
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(send (send canvas get-editor) print))
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;; receive-result takes a result from the model and renders it
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;; on-screen. Runs on the user thread.
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;; : (step-result -> void)
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(define (receive-result result)
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(let ([step-text
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(cond [(before-after-result? result)
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(new x:stepper-text%
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[left-side (before-after-result-pre-exps result)]
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[right-side (before-after-result-post-exps result)])]
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[(before-error-result? result)
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(new x:stepper-text%
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[left-side (before-error-result-pre-exps result)]
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[right-side (before-error-result-err-msg result)])]
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[(error-result? result)
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(new x:stepper-text%
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[left-side null]
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[right-side (error-result-err-msg result)])]
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[(finished-stepping? result)
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x:finished-text])]
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[step-kind (or (and (before-after-result? result)
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(before-after-result-kind result))
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(and (finished-stepping? result)
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'finished-stepping))])
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(hand-off-and-block step-text step-kind)))
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;; need to capture the custodian as the thread starts up:
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(define (program-expander-prime init iter)
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(program-expander
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(lambda args
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(send s-frame set-custodian! (current-custodian))
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(apply init args))
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iter))
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;; CONFIGURE GUI ELEMENTS
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(send s-frame set-printing-proc print-current-view)
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(send button-panel stretchable-width #f)
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(send button-panel stretchable-height #f)
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(send canvas stretchable-height #t)
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(en/dis-able-buttons)
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(send (send s-frame edit-menu:get-undo-item) enable #f)
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(send (send s-frame edit-menu:get-redo-item) enable #f)
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;; START THE MODEL
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(model:go
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program-expander-prime receive-result
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(get-render-settings render-to-string render-to-sexp
|
|
(send language-level stepper:enable-let-lifting?))
|
|
(send language-level stepper:show-lambdas-as-lambdas?)
|
|
language-level
|
|
run-on-drscheme-side
|
|
#f)
|
|
(send s-frame show #t)
|
|
|
|
s-frame)
|
|
|
|
;; stepper-unit-frame<%> : the interface that the extended drscheme frame
|
|
;; fulfils
|
|
(define stepper-unit-frame<%>
|
|
(interface ()
|
|
get-stepper-frame
|
|
on-stepper-close))
|
|
|
|
;; stepper-unit-frame-mixin : the mixin that is applied to the drscheme
|
|
;; frame to interact with a possible stepper window
|
|
(define (stepper-unit-frame-mixin super%)
|
|
(class* super% (stepper-unit-frame<%>)
|
|
|
|
(inherit get-button-panel register-toolbar-button get-interactions-text get-definitions-text)
|
|
|
|
(define stepper-frame #f)
|
|
(define/public (on-stepper-close)
|
|
(set! stepper-frame #f))
|
|
(define/public (get-stepper-frame) stepper-frame)
|
|
|
|
(super-new)
|
|
|
|
;; program-expander : produces expanded expressions from the
|
|
;; definitions window one at a time and calls 'iter' on each one
|
|
(define (program-expander init iter)
|
|
(let* ([lang-settings
|
|
(send (get-definitions-text) get-next-settings)]
|
|
[lang (drscheme:language-configuration:language-settings-language lang-settings)]
|
|
[settings (drscheme:language-configuration:language-settings-settings lang-settings)])
|
|
(drscheme:eval:expand-program
|
|
(drscheme:language:make-text/pos
|
|
(get-definitions-text)
|
|
0
|
|
(send (get-definitions-text) last-position))
|
|
lang-settings
|
|
#f
|
|
(lambda ()
|
|
(init)
|
|
(error-value->string-handler
|
|
(lambda (val len)
|
|
(let ([sp (open-output-string)])
|
|
(send lang render-value val settings sp)
|
|
(let ([str (get-output-string sp)])
|
|
(if ((string-length str) . <= . len)
|
|
str
|
|
(string-append (substring str 0 (max 0 (- len 3)))
|
|
"..."))))))
|
|
(current-print void))
|
|
void ; kill
|
|
iter)))
|
|
|
|
;; STEPPER BUTTON
|
|
|
|
(define/public (get-stepper-button) stepper-button)
|
|
|
|
(define stepper-button-parent-panel
|
|
(new horizontal-panel%
|
|
[parent (get-button-panel)]
|
|
[stretchable-width #f]
|
|
[stretchable-height #f]))
|
|
|
|
(define stepper-button
|
|
(new switchable-button%
|
|
[parent stepper-button-parent-panel]
|
|
[label (string-constant stepper-button-label)]
|
|
[bitmap x:foot-img/horizontal]
|
|
[alternate-bitmap x:foot-img/vertical]
|
|
[callback (lambda (button)
|
|
(if stepper-frame
|
|
(send stepper-frame show #t)
|
|
(let* ([language-level
|
|
(extract-language-level (get-definitions-text))]
|
|
[language-level-name (language-level->name language-level)])
|
|
(if (stepper-works-for? language-level)
|
|
(set! stepper-frame
|
|
(view-controller-go this program-expander))
|
|
(message-box
|
|
(string-constant stepper-name)
|
|
(format (string-constant stepper-language-level-message)
|
|
language-level-name))))))]))
|
|
|
|
(register-toolbar-button stepper-button)
|
|
|
|
(define/augment (enable-evaluation)
|
|
(send stepper-button enable #t)
|
|
(inner (void) enable-evaluation))
|
|
|
|
(define/augment (disable-evaluation)
|
|
(send stepper-button enable #f)
|
|
(inner (void) disable-evaluation))
|
|
|
|
(define/augment (on-close)
|
|
(when stepper-frame
|
|
(send stepper-frame original-program-gone))
|
|
(inner (void) on-close))
|
|
|
|
(define/augment (on-tab-change old new)
|
|
(check-current-language-for-stepper)
|
|
(inner (void) on-tab-change old new))
|
|
|
|
(define/public (check-current-language-for-stepper)
|
|
(if (stepper-works-for?
|
|
(extract-language-level (get-definitions-text)))
|
|
(unless (send stepper-button is-shown?)
|
|
(send (send stepper-button get-parent)
|
|
add-child stepper-button))
|
|
(when (send stepper-button is-shown?)
|
|
(send (send stepper-button get-parent)
|
|
delete-child stepper-button))))
|
|
|
|
;; add the stepper button to the button panel:
|
|
(send (get-button-panel) change-children
|
|
(lx (cons stepper-button-parent-panel
|
|
(remq stepper-button-parent-panel _))))
|
|
|
|
;; hide stepper button if it's not supported for the initial language:
|
|
(check-current-language-for-stepper)))
|
|
|
|
;; stepper-definitions-text-mixin : a mixin for the definitions text that
|
|
;; alerts thet stepper when the definitions text is altered or destroyed
|
|
(define (stepper-definitions-text-mixin %)
|
|
(class %
|
|
|
|
(inherit get-top-level-window)
|
|
(define/private (notify-stepper-frame-of-change)
|
|
(let ([win (get-top-level-window)])
|
|
;; should only be #f when win is #f
|
|
(when (is-a? win stepper-unit-frame<%>)
|
|
(let ([stepper-window (send win get-stepper-frame)])
|
|
(when stepper-window
|
|
(send stepper-window original-program-changed))))))
|
|
|
|
(define/augment (on-insert x y)
|
|
(unless metadata-changing-now?
|
|
(notify-stepper-frame-of-change))
|
|
(inner (void) on-insert x y))
|
|
|
|
(define/augment (on-delete x y)
|
|
(unless metadata-changing-now?
|
|
(notify-stepper-frame-of-change))
|
|
(inner (void) on-delete x y))
|
|
|
|
(define/augment (after-set-next-settings s)
|
|
(let ([tlw (get-top-level-window)])
|
|
(when tlw
|
|
(send tlw check-current-language-for-stepper)))
|
|
(inner (void) after-set-next-settings s))
|
|
|
|
(define metadata-changing-now? #f)
|
|
|
|
;; don't pay attention to changes that occur on metadata.
|
|
;; this assumes that metadata changes cannot be nested.
|
|
(define/augment (begin-metadata-changes)
|
|
(set! metadata-changing-now? #t)
|
|
(inner (void) begin-metadata-changes))
|
|
|
|
(define/augment (end-metadata-changes)
|
|
(set! metadata-changing-now? #f)
|
|
(inner (void) end-metadata-changes))
|
|
|
|
(super-new)))
|
|
|
|
;; apply the mixins dynamically to the drscheme unit frame and
|
|
;; definitions text:
|
|
(drscheme:get/extend:extend-unit-frame stepper-unit-frame-mixin)
|
|
(drscheme:get/extend:extend-definitions-text stepper-definitions-text-mixin)
|
|
|
|
)
|
|
|
|
;; COPIED FROM drscheme/private/language.ss
|
|
;; simple-module-based-language-convert-value : TST STYLE boolean -> TST
|
|
(define (simple-module-based-language-convert-value value style show-sharing?)
|
|
(define ((leave-snips-alone-hook sh) expr basic-convert sub-convert)
|
|
(if (or (is-a? expr snip%)
|
|
;; FIXME: internal in language.ss (to-snip-value? expr)
|
|
)
|
|
expr
|
|
(sh expr basic-convert sub-convert)))
|
|
;; mflatt: MINOR HACK - work around temporary
|
|
;; print-convert problems
|
|
(define (stepper-print-convert v)
|
|
(or (and (procedure? v) (object-name v))
|
|
(print-convert v)))
|
|
|
|
(case style
|
|
[(write) value]
|
|
[(current-print) value]
|
|
[(constructor)
|
|
(parameterize
|
|
([constructor-style-printing #t]
|
|
[show-sharing show-sharing?]
|
|
[current-print-convert-hook
|
|
(leave-snips-alone-hook (current-print-convert-hook))])
|
|
(stepper-print-convert value))]
|
|
[(quasiquote)
|
|
(parameterize
|
|
([constructor-style-printing #f]
|
|
[show-sharing show-sharing?]
|
|
[current-print-convert-hook
|
|
(leave-snips-alone-hook (current-print-convert-hook))])
|
|
(stepper-print-convert value))]
|
|
[else (error "Internal stepper error: time to resync with simple-module-based-language-convert-value")]))
|
|
|
|
;; set-print-settings ; settings ( -> TST) -> TST
|
|
(define (set-print-settings language simple-settings thunk)
|
|
(if (method-in-interface? 'set-printing-parameters (object-interface language))
|
|
(send language set-printing-parameters simple-settings thunk)
|
|
;; assume that the current print-convert context is fine
|
|
;; (error 'stepper-tool "language object does not contain set-printing-parameters method")
|
|
(thunk)))
|
|
|
|
;; WE REALLY WANT TO GET RID OF THIS STUFF (2005-07-01, JBC)
|
|
|
|
;; make-print-convert-hook:
|
|
;; simple-settings -> (TST (TST -> TST) (TST -> TST) -> TST)
|
|
;; this code copied from various locations in language.ss and rep.ss
|
|
(define (make-print-convert-hook simple-settings)
|
|
(lambda (exp basic-convert sub-convert)
|
|
(cond
|
|
[(is-a? exp snip%)
|
|
(send exp copy)]
|
|
#;
|
|
[((drscheme:rep:use-number-snip) exp)
|
|
(let ([number-snip-type
|
|
(drscheme:language:simple-settings-fraction-style
|
|
simple-settings)])
|
|
(cond
|
|
[(eq? number-snip-type 'repeating-decimal)
|
|
(drscheme:number-snip:make-repeating-decimal-snip exp #f)]
|
|
[(eq? number-snip-type 'repeating-decimal-e)
|
|
(drscheme:number-snip:make-repeating-decimal-snip exp #t)]
|
|
[(eq? number-snip-type 'mixed-fraction)
|
|
(drscheme:number-snip:make-fraction-snip exp #f)]
|
|
[(eq? number-snip-type 'mixed-fraction-e)
|
|
(drscheme:number-snip:make-fraction-snip exp #t)]
|
|
[else
|
|
(error 'which-number-snip
|
|
"expected either 'repeating-decimal, 'repeating-decimal-e, 'mixed-fraction, or 'mixed-fraction-e got : ~e"
|
|
number-snip-type)]))]
|
|
[else (basic-convert exp)])))
|
|
|
|
)
|