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117 lines
3.8 KiB
Racket
117 lines
3.8 KiB
Racket
#lang racket/base
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(require (for-syntax racket/base racket/syntax)
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racket/list
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racket/syntax
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syntax/strip-context
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br/define
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br/private/syntax-flatten)
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(provide (all-defined-out)
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syntax-flatten
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(all-from-out syntax/strip-context))
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(module+ test
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(require rackunit))
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(define-macro (syntax-match STX-ARG [(syntax PATTERN) BODY ...] ...)
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#'(syntax-case STX-ARG ()
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[PATTERN BODY ...] ...))
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(define-macro-cases with-pattern
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[(_ () . BODY) #'(begin . BODY)]
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[(_ ([SID SID-STX] STX ...) . BODY)
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#'(with-syntax ([SID SID-STX])
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(with-pattern (STX ...) . BODY))]
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[(_ ([SID] STX ...) . BODY) ; standalone id
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#'(with-pattern ([SID SID] STX ...) . BODY)]) ; convert to previous case
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(define (check-syntax-list-argument caller-name arg)
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(cond
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[(and (syntax? arg) (syntax->list arg))]
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[(list? arg) arg]
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[else (raise-argument-error caller-name "list of syntax, or syntaxed list" arg)]))
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(define-macro (define-listy-macro MACRO-ID LIST-FUNC)
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#'(define-macro (MACRO-ID STX-LIST LITERALS . MATCHERS)
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#'(LIST-FUNC
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(λ(stx-item)
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(with-handlers ([exn:fail:syntax? (λ (exn) #f)])
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(syntax-case stx-item LITERALS
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. MATCHERS)))
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(check-syntax-list-argument 'MACRO-ID STX-LIST))))
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(define-listy-macro syntax-case-partition partition)
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(define-listy-macro syntax-case-filter filter)
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(define-listy-macro syntax-case-map map)
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(define-macro (reformat-id FMT ID0 ID ...)
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#'(format-id ID0 FMT ID0 ID ...))
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(define-macro (format-string FMT ID0 ID ...)
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#'(datum->syntax ID0 (format FMT (syntax->datum ID0) (syntax->datum ID) ...)))
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(define-macro (->unsyntax X)
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#'(if (syntax? X)
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(syntax->datum X)
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X))
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(define-macro (prefix-id PREFIX ... BASE-OR-BASES)
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#'(let* ([bobs BASE-OR-BASES]
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[got-single? (and (not (list? bobs)) (not (syntax->list bobs)))]
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[bases (if got-single?
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(list bobs)
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bobs)]
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[result (syntax-case-map
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bases ()
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[base (format-id #'base "~a~a"
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(string-append (format "~a" (->unsyntax PREFIX)) ...)
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(syntax-e #'base))])])
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(if got-single? (car result) result)))
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(define-macro (infix-id PREFIX BASE-OR-BASES SUFFIX ...)
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#'(let* ([bobs BASE-OR-BASES]
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[got-single? (and (not (list? bobs)) (not (syntax->list bobs)))]
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[bases (if got-single?
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(list bobs)
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bobs)]
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[result (syntax-case-map
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bases ()
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[base (format-id #'base "~a~a~a"
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(->unsyntax PREFIX)
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(syntax-e #'base)
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(string-append (format "~a" (->unsyntax SUFFIX)) ...))])])
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(if got-single? (car result) result)))
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(define-macro (suffix-id BASE-OR-BASES SUFFIX ...)
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#'(infix-id "" BASE-OR-BASES SUFFIX ...))
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(define-macro-cases syntax-property*
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[(_ STX 'PROP0) ; read one
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#'(syntax-property STX 'PROP0)]
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[(_ STX 'PROP0 'PROP ...) ; read multiple
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#'(cons (syntax-property* STX 'PROP0)
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(let ([result (syntax-property* STX 'PROP ...)])
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(if (pair? result)
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result
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(list result))))]
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[(_ STX ['PROP0 VAL0 . PRESERVED0]) ; write one
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#'(syntax-property STX 'PROP0 VAL0 . PRESERVED0)]
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[(_ STX ['PROP0 VAL0 . PRESERVED0] ['PROP VAL . PRESERVED] ...) ; write multiple
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#'(syntax-property* (syntax-property STX 'PROP0 VAL0 . PRESERVED0) ['PROP VAL . PRESERVED] ...)])
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(module+ test
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(define x (syntax-property* #'foo ['bar #t] ['zam 'boni]))
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(check-false (syntax-property* x 'foo))
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(check-true (syntax-property* x 'bar))
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(check-equal? (syntax-property* x 'foo 'bar 'zam) '(#f #t boni))) |