racket/collects/lang/htdp-beginner.rkt

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;; Implements the Beginner Scheme language, at least in terms of the
;; forms and procedures. The reader-level aspects of the language
;; (e.g., case-sensitivity) are not implemented here.
#lang scheme/base
(require mzlib/etc
mzlib/list
syntax/docprovide
"private/rewrite-error-message.rkt"
(for-syntax "private/rewrite-error-message.rkt")
(for-syntax scheme/base))
;; Implements the forms:
(require "private/teach.rkt"
"private/teach-module-begin.rkt"
test-engine/scheme-tests)
;; syntax:
(provide (rename-out
[beginner-define define]
[beginner-define-struct define-struct]
[beginner-lambda lambda]
[beginner-app #%app]
[beginner-top #%top]
[beginner-cond cond]
[beginner-else else]
[beginner-if if]
[beginner-and and]
[beginner-or or]
[beginner-quote quote]
[beginner-module-begin #%module-begin]
[beginner-require require]
[beginner-dots ..]
[beginner-dots ...]
[beginner-dots ....]
[beginner-dots .....]
[beginner-dots ......]
[beginner-true true]
[beginner-false false]
)
check-expect
check-within
check-error
check-member-of
check-range
;; define-wish
#%datum
#%top-interaction
empty
; signature : -> mixed one-of predicate combined
; Number Real Rational Integer Natural Boolean True False String Symbol Char Empty-list Any
; cons-of
; Property
; check-property for-all ==> expect expect-within expect-member-of expect-range
)
(require (for-syntax "private/firstorder.rkt"))
(define-syntax (in-rator-position-only stx)
(syntax-case stx ()
[(_ new-name orig-name)
(let ([new (syntax new-name)]
[orig (syntax orig-name)])
;; Some things are not really functions:
(if (memq (syntax-e orig) '(beginner:pi beginner:e beginner:null beginner:eof))
#'(define new-name orig-name)
#'(define-syntax new-name
(make-first-order
(lambda (stx)
(syntax-case stx ()
[(id . args)
(syntax/loc stx (beginner-app orig-name . args))]
[_else
(raise-syntax-error
#f
(format
"expected a function call, but there is no open parenthesis before this function")
stx)]))
#'orig-name))))]))
;; procedures:
(provide-and-document/wrap
procedures
in-rator-position-only
(all-from beginner: lang/private/beginner-funs procedures))