203 lines
6.4 KiB
Racket
203 lines
6.4 KiB
Racket
#lang typed/racket
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(require (for-syntax syntax/parse racket/list))
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(provide Symbol VariableMapping
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eval-with eval1-with
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extract-symbols
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any->string stringify-variable-mapping string->any map-sexp
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read-org-sexp unorg
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;; Syntax
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auto-hash-ref/explicit auto-hash-ref/:)
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(module+ test
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(require typed/rackunit))
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;;; ===================
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;;; HashTable injection
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;;; ===================
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(define-type Variable Symbol)
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(define-type (VariableMapping A) (Immutable-HashTable Variable A))
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(: eval-with (-> (VariableMapping Any) Any AnyValues))
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(define (eval-with ht expr)
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(parameterize ([current-namespace (make-base-namespace)])
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(for ([(x val) (in-hash ht)]) (namespace-set-variable-value! x val))
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(eval expr)))
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(: eval1-with (-> (VariableMapping Any) Any Any))
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(define (eval1-with ht expr)
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(call-with-values (λ () (eval-with ht expr))
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(λ args (car args))))
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(module+ test
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(test-case "eval-with"
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(check-equal? (eval1-with (hash 'a 1 'b 2) '(+ a b 1))
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4)
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(define ht : (VariableMapping Integer) (hash 'a 1 'b 2))
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(define expr : Any '(+ a b 1))
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(check-equal? (eval1-with ht expr)
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4)))
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(define-syntax (auto-hash-ref/explicit stx)
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(syntax-parse stx
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[(_ (ht:id xs:id ...) body:expr)
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#`(let #,(for/list ([x (syntax->list #'(xs ...))])
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#`[#,x (hash-ref ht '#,x)])
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body)]))
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(module+ test
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(test-case "auto-hash-ref/explicit"
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(define mytable #hash((a . 3) (b . 4)))
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(check-equal? (auto-hash-ref/explicit (mytable b a)
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(* a b))
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12)
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(define ht #hash((a . #t) (b . #f)))
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(check-equal? (auto-hash-ref/explicit (ht a b)
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(and (not a) b))
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#f)))
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(define-syntax (auto-hash-ref/: stx)
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(syntax-parse stx
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[(_ ht:id body)
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(let* ([names/: (collect-colons (syntax->datum #'body))])
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#`(let #,(for/list ([x names/:])
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;; put x in the same context as body
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#`[#,(datum->syntax #'body x)
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(hash-ref ht '#,(strip-colon x))])
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body))]))
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;;; The helper functions for auto-hash-ref/:.
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(begin-for-syntax
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;; Collect all the symbols starting with a colon in datum.
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(define (collect-colons datum)
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(remove-duplicates
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(flatten
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(for/list ([token datum])
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(cond
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[(symbol? token)
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(let ([name (symbol->string token)])
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(if (eq? #\: (string-ref name 0))
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token
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'()))]
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[(list? token)
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(collect-colons token)]
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[else '()])))))
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;; Strip the leading colon off x.
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(define (strip-colon x)
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(let ([x-str (symbol->string x)])
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(if (eq? #\: (string-ref x-str 0))
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(string->symbol (substring x-str 1))
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x))))
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(module+ test
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(test-case "auto-hash-ref/:"
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(define ht1 #hash((x . #t) (y . #t) (t . #f)))
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(define z #t)
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(check-equal? (auto-hash-ref/: ht1
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(and :x (not :y) z (or (and :t) :x)))
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#f)
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(define ht2 #hash((a . 1) (b . 2)))
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(check-equal? (auto-hash-ref/: ht2 (+ :a (* 2 :b)))
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5)))
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;;; ==============================
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;;; Analysis of quoted expressions
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;;; ==============================
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;;; Produces a list of symbols appearing in the quoted expression
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;;; passed in the first argument.
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(: extract-symbols (-> Any (Listof Symbol)))
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(define (extract-symbols form)
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(: extract-rec (-> Any (Listof Any)))
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(define (extract-rec form)
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(match form
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[(? symbol?) (list form)]
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[(? list?)
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(flatten (for/list : (Listof Any)
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([x form])
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(extract-symbols x)))]
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[else '()]))
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(cast (extract-rec form) (Listof Symbol)))
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(module+ test
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(test-case "extract-symbols"
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(check-equal? (extract-symbols '(1 (2 3) x (y z 3)))
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'(x y z))))
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;;; =========================
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;;; Org-mode interoperability
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;;; =========================
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(: any->string (-> Any String))
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(define (any->string x)
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(with-output-to-string (λ () (display x))))
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(module+ test
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(test-case "any->string"
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(check-equal? (any->string 'a) "a")
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(check-equal? (any->string '(a 1 (x y))) "(a 1 (x y))")
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(check-equal? (any->string "hello") "hello")))
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(: stringify-variable-mapping (-> (VariableMapping Any) (VariableMapping String)))
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(define (stringify-variable-mapping ht)
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(for/hash : (VariableMapping String)
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([(key val) (in-hash ht)]) (values key (any->string val))))
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(module+ test
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(test-case "stringify-variable-mapping"
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(define mp (stringify-variable-mapping #hash((a . (and a b)) (b . (not b)))))
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(check-equal? (hash-ref mp 'a) "(and a b)")
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(check-equal? (hash-ref mp 'b) "(not b)")))
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(: string->any (-> String Any))
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(define (string->any str)
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(with-input-from-string str (λ () (read))))
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(module+ test
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(test-case "string->any"
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(check-equal? (string->any "(or b (not a))") '(or b (not a)))
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(check-equal? (string->any "14") 14)))
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;;; Given a sexp, converts all "#f" to #f and "#t" to #t.
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;;;
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;;; When I read Org-mode tables, I pump them through a call to the
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;;; prin1 because the elisp sexp seems incompatible with Racket. On
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;;; the other hand, Racket Booleans seem to upset elisp a little, so
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;;; prin1 wraps them in additional double quotes. This function
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;;; removes those quotes.
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(: handle-org-booleans (-> Any Any))
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(define/match (handle-org-booleans datum)
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[("#t") #t]
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[("#f") #f]
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[((? list?)) (map handle-org-booleans datum)]
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[ (_) datum])
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(: map-sexp (-> (-> Any Any) Any Any))
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(define (map-sexp func sexp)
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(match sexp
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[(? list?) (map ((curry map-sexp) func) sexp)]
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[datum (func datum)]))
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(module+ test
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(test-case "map-sexp"
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(check-equal? (map-sexp (λ (x) (add1 (cast x Number))) '(1 2 (4 10) 3))
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'(2 3 (5 11) 4))))
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(: read-org-sexp (-> String Any))
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(define read-org-sexp
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(compose ((curry map-sexp) (match-lambda
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[(and (? string?) str) (string->any str)]
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[x x]))
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string->any))
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(define unorg read-org-sexp)
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(module+ test
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(test-case "read-org-sexp"
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(check-equal? (read-org-sexp "((\"a\" \"(and a b)\") (\"b\" \"(or b (not a))\"))")
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'((a (and a b)) (b (or b (not a)))))
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(check-equal? (unorg "(#t \"#t\" \"#t \" '(1 2 \"#f\"))")
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'(#t #t #t '(1 2 #f)))))
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