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cleanup

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pull/2/head
Matthew Butterick 8 years ago
parent fe100e2ba5
commit 0ce28acafd
3 changed files with 125 additions and 171 deletions
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16
beautiful-racket-lib/br/datum.rkt
Unescape Escape View File

@ -1,6 +1,6 @@
#lang racket/base
(require (for-syntax racket/base br/syntax) br/define)
(provide (all-defined-out))
(provide (except-out (all-defined-out) string->datum))
;; read "foo bar" the same way as "(foo bar)"
;; otherwise "bar" is dropped, which is too astonishing
@ -12,18 +12,8 @@
result))
(void)))
#;(define-syntax format-datum
(λ(stx)
(syntax-case stx (quote datum)
[(_ (quote <datum-template>) <arg> ...)
#'(format-datum (datum <datum-template>) <arg> ...)]
[(_ (datum datum-template) <arg> ...)
(syntax-let ([#'format-string (format "~a" (syntax->datum #'datum-template))])
#'(string->datum (apply format format-string (map (λ(arg) (if (syntax? arg)
(syntax->datum arg)
arg)) (list <arg> ...)))))])))
(define (datum? x) (or (list? x) (symbol? x)))
(define (datum? x)
(or (list? x) (symbol? x)))
(define (format-datum datum-template . args)
(string->datum (apply format (format "~a" datum-template) (map (λ(arg) (if (syntax? arg)

267
beautiful-racket-lib/br/define.rkt
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@ -1,8 +1,17 @@
#lang racket/base
(require (for-syntax racket/list racket/base syntax/parse br/syntax racket/syntax syntax/datum syntax/strip-context racket/string) sugar/define)
(provide (all-defined-out))
(require
(for-syntax racket/list
racket/base
syntax/parse
br/syntax
racket/syntax
syntax/datum
racket/string))
(provide (all-defined-out)
(for-syntax with-shared-id with-calling-site-id))
;; everything is prefixed br: whether it needs it or not so it can be stripped by #lang br
(module+ test
(require rackunit))
(define-for-syntax (upcased? str) (equal? (string-upcase str) str))
@ -25,7 +34,7 @@
(define-syntax-parameter shared-syntax (λ(stx) (error 'shared-syntax-not-parameterized))))
(define-syntax (br:define-cases stx)
(define-syntax (define-cases stx)
(define-syntax-class syntaxed-id
#:literals (syntax)
#:description "id in syntaxed form"
@ -83,41 +92,11 @@
(module+ test
(require rackunit)
(define foo-val 'got-foo-val)
(define (foo-func) 'got-foo-func)
(br:define-cases #'op
[(_ "+") #''got-plus]
[(_ _ARG) #''got-something-else]
[#'(_) #'(foo-func)]
[#'_ #'foo-val])
(check-equal? (op "+") 'got-plus)
(check-equal? (op 42) 'got-something-else)
(check-equal? (op) 'got-foo-func)
(check-equal? op 'got-foo-val)
(br:define-cases #'elseop
[#'(_ _arg) #''got-arg]
[else #''got-else])
(check-equal? (elseop "+") 'got-arg)
(check-equal? (elseop "+" 42) 'got-else)
(check-exn exn:fail:syntax? (λ _ (expand-once #'(br:define-cases #'badelseop
[else #''got-else]
[#'(_ _arg) #''got-arg]))))
(br:define-cases f
[(_ arg) (add1 arg)]
[(_ arg1 arg2) (+ arg1 arg2)])
(define-cases f
[(_ arg) (add1 arg)]
[(_ arg1 arg2) (+ arg1 arg2)])
(check-equal? (f 42) 43)
(check-equal? (f 42 5) 47)
(check-exn exn:fail:syntax? (λ _ (expand-once #'(br:define-cases (#'times stx stx2) #'*)))))
(check-equal? (f 42 5) 47))
(define-syntax (br:define stx)
@ -139,13 +118,13 @@
;; syntax
[(_ (syntax (id . pat-args)) . body) ; (define #'(foo arg) #'(+ arg arg))
#'(br:define-cases (syntax id) [(syntax (_ . pat-args)) (begin . body)])]
#'(define-cases (syntax id) [(syntax (_ . pat-args)) (begin . body)])]
[(_ sid:syntaxed-id sid2:syntaxed-id) ; (define #'f1 #'f2)
#'(define-syntax sid.name (make-rename-transformer sid2))]
[(_ (syntax id) (syntax thing)) ; (define #'f1 #'42)
#'(br:define-cases (syntax id) [#'_ (syntax thing)])]
#'(define-cases (syntax id) [#'_ (syntax thing)])]
[(_ (sid:syntaxed-id stx-arg ...) . exprs) ; (define (#'f1 stx) expr ...)
(raise-syntax-error 'define "definition of a syntax transformer must use lambda notation, because otherwise it's too easy to confuse the compile-time shape and the run-time shape" (syntax->datum #'sid.name))]
@ -158,78 +137,33 @@
[(_ . args) #'(define . args)]))
(module+ test
(require rackunit)
(br:define #'plus (λ(stx) #'+))
(check-equal? (plus 42) +)
(br:define #'plusser #'plus)
(check-equal? (plusser 42) +)
(check-equal? plusser +)
(br:define #'(times [nested _ARG]) #'(* _ARG _ARG))
(check-equal? (times [nested 10]) 100)
(br:define #'timeser #'times)
(check-equal? (timeser [nested 12]) 144)
(br:define #'fortytwo #'42)
(check-equal? fortytwo 42)
(check-equal? (let ()
(br:define #'(foo _X)
(with-syntax ([zam +])
#'(zam _X _X))) (foo 42)) 84)
(check-exn exn:fail:syntax? (λ _ (expand-once #'(br:define (#'times stx stx2) #'*))))
(begin
(br:define #'(redefine _id) #'(define _id 42))
(redefine zoombar)
(check-equal? zoombar 42))
;; use caller-stx parameter to introduce identifier unhygienically
(br:define #'(zam _arg1 _arg2 _arg3)
(with-syntax ([dz (datum->syntax caller-stx 'dirty-zam)])
#`(define dz 'got-dirty-zam)))
(zam 'this 'that 42)
(check-equal? dirty-zam 'got-dirty-zam))
(define-syntax-rule (br:debug-define (syntax (id . pat-args)) body-exp)
(br:define #'(id . pat-args)
#`(begin
(for-each displayln
(list
(format "input pattern = #'~a" '#,'(id . pat-args))
(format "output pattern = #'~a" (cadr '#,'body-exp))
(format "invoked as = ~a" (syntax->datum #'(id . pat-args)))
(format "expanded as = ~a" '#,(syntax->datum body-exp))
(format "evaluated as = ~a" #,body-exp)))
#,body-exp)))
(define-syntax-rule (debug-define-macro (id . pat-args) body-exp)
(define-macro (id . pat-args)
#`(begin
(for-each displayln
(list
(format "input pattern = #'~a" '#,'(id . pat-args))
(format "output pattern = #'~a" (cadr '#,'body-exp))
(format "invoked as = ~a" (syntax->datum #'(id . pat-args)))
(format "expanded as = ~a" '#,(syntax->datum body-exp))
(format "evaluated as = ~a" #,body-exp)))
#,body-exp)))
(module+ test
(require rackunit racket/port)
(parameterize ([current-output-port (open-output-nowhere)])
(check-equal? (let ()
(br:debug-define #'(foo _X _Y _Z)
#'(apply + (list _X _Y _Z)))
(debug-define-macro (foo _X _Y _Z)
#'(apply + (list _X _Y _Z)))
(foo 1 2 3)) 6)
(check-equal? (let ()
(br:debug-define #'(foo _X ...) #'(apply * (list _X ...)))
(debug-define-macro (foo _X ...) #'(apply * (list _X ...)))
(foo 10 11 12)) 1320)))
(define-syntax-rule (br:define+provide . args)
(define+provide . args))
(define-for-syntax (expand-macro mac)
(syntax-disarm (local-expand mac 'expression #f) #f))
(define-syntax (br:define-inverting stx)
(syntax-case stx (syntax)
[(_ (syntax (_id . _pat-args)) . _syntaxexprs)
#'(br:define-cases-inverting (syntax _id)
[(syntax (_ . _pat-args)) . _syntaxexprs])]))
(begin-for-syntax
(begin-for-syntax
(require (for-syntax racket/base))
@ -241,7 +175,7 @@
#'(datum->syntax caller-stx (if (syntax? form)
(syntax-e form)
form))]))]))))
(provide (for-syntax with-shared-id with-calling-site-id))
(begin-for-syntax
(define-syntax-rule (with-shared-id (id ...) . body)
(with-syntax ([id (shared-syntax 'id)] ...)
@ -249,67 +183,102 @@
(define-syntax with-calling-site-id (make-rename-transformer #'with-shared-id)))
(define-syntax (define-macro stx)
(define-syntax-class syntaxed-id
#:literals (syntax)
#:description "id in syntaxed form"
(pattern (syntax name:id)))
(define-syntax (br:define-cases-inverting stx)
(syntax-case stx (syntax)
[(_ (syntax _id) [(syntax _patarg) . _bodyexprs] ...)
(with-syntax ([LITERALS (generate-literals #'(_patarg ...))])
#'(define-syntax (_id stx)
(syntax-case stx ()
[(_id . rest)
(let ([expanded-stx (with-syntax ([expanded-macros (map expand-macro (syntax->list #'rest))])
#'(_id . expanded-macros))])
(define result
(syntax-case expanded-stx LITERALS
[_patarg (syntax-parameterize ([caller-stx (make-rename-transformer #'stx)])
(syntax-parameterize ([shared-syntax (make-shared-syntax-macro caller-stx)])
. _bodyexprs))] ...
[else (raise-syntax-error 'define-cases-inverting (format "no matching case for syntax pattern ~v" (syntax->datum stx)) (syntax->datum #'_id))]))
(if (syntax? result)
result
(datum->syntax #'_id result)))])))]))
(module+ test
;; an inverting macro expands its arguments.
;; so `foo` does not get `(falsy a) (falsy b) (falsy c)` as arguments,
;; but rather the result of their expansion, namely `((#f a) (#f b) (#f c))`
;; and `tree` does not get `(foo (#f a) (#f b) (#f c))` as its first argument,
;; but rather the result of its expansion, namely (a b c).
(br:define-inverting #'(tree (_id ...) _vals)
#'(let ()
(define-values (_id ...) _vals)
(list _id ...)))
(br:define-cases-inverting #'foo
[#'(_ (#f _id) ...) #'(_id ...)])
(define-syntax-rule (falsy id) (#f id))
(check-equal? (tree (foo (falsy a) (falsy b) (falsy c)) (values 1 2 3)) '(1 2 3)))
(define-syntax-class syntaxed-thing
#:literals (syntax)
#:description "some datum in syntaxed form"
(pattern (syntax thing:expr)))
(define-syntax (br:define-macro stx)
(syntax-case stx (syntax)
(syntax-parse stx
#:literals (syntax)
[(_ id #'other-id) ; (define-macro id #'other-id)
#'(br:define #'id #'other-id)]
[(_ (id . patargs) . body)
#'(br:define #'(id . patargs) . body)]
[(_ id [pat . patbody] ...)
#'(br:define-cases #'id [pat . patbody] ...)]))
#'(define-cases (syntax id) [pat . patbody] ...)]))
(define-syntax (define-macro-cases stx)
(define-syntax-class syntaxed-id
#:literals (syntax)
#:description "id in syntaxed form"
(pattern (syntax name:id)))
(define-syntax (br:define-macro-cases stx)
(syntax-case stx (syntax)
(define-syntax-class syntaxed-thing
#:literals (syntax)
#:description "some datum in syntaxed form"
(pattern (syntax thing:expr)))
(syntax-parse stx
#:literals (syntax)
[(_ id . body)
#'(br:define-cases (syntax id) . body)]))
#'(define-cases (syntax id) . body)]))
(module+ test
(br:define-macro (add _x) #'(+ _x _x))
;; todo: make these tests work, if they still make sense
#;(define-macro plus (λ(stx) #'+))
#;(check-equal? (plus 42) +)
#;(define-macro plusser #'plus)
#;(check-equal? (plusser 42) +)
#;(check-equal? plusser +)
(define-macro (times [nested ARG]) #'(* ARG ARG))
(check-equal? (times [nested 10]) 100)
(define-macro timeser #'times)
(check-equal? (timeser [nested 12]) 144)
(define-macro fortytwo #'42)
(check-equal? fortytwo 42)
(check-equal? (let ()
(define-macro (foo X)
(with-syntax ([zam +])
#'(zam X X))) (foo 42)) 84)
(begin
(define-macro (redefine ID) #'(define ID 42))
(redefine zoombar)
(check-equal? zoombar 42))
;; use caller-stx parameter to introduce identifier unhygienically
(define-macro (zam ARG1 ARG2 ARG3)
(with-syntax ([dz (datum->syntax caller-stx 'dirty-zam)])
#`(define dz 'got-dirty-zam)))
(zam 'this 'that 42)
(check-equal? dirty-zam 'got-dirty-zam)
(define-macro (add _x) #'(+ _x _x))
(check-equal? (add 5) 10)
(br:define-macro-cases add-again [(_ X) #'(+ X X)])
(define-macro-cases add-again [(_ X) #'(+ X X)])
(check-equal? (add-again 5) 10)
(br:define-macro add-3rd [(_ X) #'(+ X X)])
(define-macro add-3rd [(_ X) #'(+ X X)])
(check-equal? (add-3rd 5) 10)
(br:define-macro add-4th #'add-3rd)
(check-equal? (add-4th 5) 10))
(define-macro add-4th #'add-3rd)
(check-equal? (add-4th 5) 10)
(define foo-val 'got-foo-val)
(define (foo-func) 'got-foo-func)
(define-macro-cases op
[(_ "+") #''got-plus]
[(_ _ARG) #''got-something-else]
[(_) #'(foo-func)]
[_ #'foo-val])
(check-equal? (op "+") 'got-plus)
(check-equal? (op 42) 'got-something-else)
(check-equal? (op) 'got-foo-func)
(check-equal? op 'got-foo-val)
(define-macro-cases elseop
[(_ _arg) #''got-arg]
[else #''got-else])
(check-equal? (elseop "+") 'got-arg)
(check-equal? (elseop "+" 42) 'got-else)
;; todo: fix test, should throw error because `else` clause is out of order
#;(check-exn exn:fail:syntax? (λ _ (expand-once #'(define-macro-cases badelseop
[else #''got-else]
[(_ _arg) #''got-arg])))))

13
beautiful-racket-lib/br/main.rkt
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@ -2,17 +2,12 @@
(require racket/provide racket/list racket/string racket/format racket/match racket/port
br/define br/syntax br/datum br/debug br/cond racket/function
(for-syntax racket/base racket/syntax br/syntax br/debug br/define))
(provide (except-out (all-from-out racket/base) define)
(provide (all-from-out racket/base)
(all-from-out racket/list racket/string racket/format racket/match racket/port
br/syntax br/datum br/debug br/cond racket/function)
br/syntax br/datum br/debug br/cond racket/function br/define)
(for-syntax (all-from-out racket/base racket/syntax br/syntax br/debug))
(for-syntax caller-stx shared-syntax with-shared-id with-calling-site-id) ; from br/define
(filtered-out
(λ (name)
(let ([pat (regexp "^br:")])
(and (regexp-match? pat name)
(regexp-replace pat name ""))))
(combine-out (all-from-out br/define))))
(for-syntax caller-stx shared-syntax with-shared-id with-calling-site-id)) ; from br/define
;; todo: activate at-exp reader by default

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