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117 lines
4.5 KiB
Racket
117 lines
4.5 KiB
Racket
#lang racket/base
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(require (for-syntax
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racket/base
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br/private/generate-literals)
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racket/list
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racket/match
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racket/syntax
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racket/format
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syntax/stx
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syntax/strip-context
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syntax/parse
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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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stx-map
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(rename-out [strip-context strip-bindings]
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[replace-context replace-bindings]
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[stx-map syntax-map]
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[syntax-flatten stx-flatten]
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[prefix-id prefix-ids]
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[suffix-id suffix-ids]
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[infix-id infix-ids]))
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(module+ test
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(require rackunit))
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(define-macro (pattern-case-filter STX-ARG PAT+BODY ...)
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#'(let* ([arg STX-ARG]
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[stxs (or (and (syntax? arg) (syntax->list arg)) arg)])
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(unless (and (list? stxs) (andmap syntax? stxs))
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(raise-syntax-error 'pattern-case-filter
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(format "~v cannot be made into a list of syntax objects" (syntax->datum arg))))
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(for*/list ([stx (in-list stxs)]
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[result (in-value (pattern-case stx PAT+BODY ... [else #f]))]
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#:when result)
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result)))
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(define-macro (syntax-parse/easy STX LITS . EXPS)
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(with-syntax ([(BOUND-LITS UNBOUND-LITS) (generate-bound-and-unbound-literals #'LITS)])
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#'(let ([stx STX])
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(syntax-parse (if (syntax? stx) stx (datum->syntax #'here stx))
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#:literals BOUND-LITS
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#:datum-literals UNBOUND-LITS
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. EXPS))))
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(define-macro-cases pattern-case
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[(_ STX-ARG
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[PAT . BODY] ...
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[else . ELSEBODY]) #'(syntax-parse/easy STX-ARG (PAT ...)
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[PAT . BODY] ...
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[else . ELSEBODY])]
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[(_ STX-ARG PAT+BODY ...)
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#'(pattern-case STX-ARG
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PAT+BODY ...
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[else (raise-syntax-error 'pattern-case
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(format "unable to match pattern for ~v" (syntax->datum STX-ARG)))])])
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(define-macro-cases with-pattern
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[(_ () . BODY) #'(begin . BODY)]
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[(_ ([PAT0 STX0] PAT+STX ...) . BODY)
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#'(syntax-parse/easy STX0 PAT0
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[PAT0 (with-pattern (PAT+STX ...) (let () . BODY))]
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[else (raise-syntax-error 'with-pattern
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(format "unable to match pattern ~a" 'PAT0) STX0)])])
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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 (->unsyntax x) (if (syntax? x) (syntax->datum x) x))
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(define (stx-join stxs)
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(apply string-append (map (compose1 ~a ->unsyntax) stxs)))
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(define (*fix-base loc-arg ctx-arg prefixes base-or-bases suffixes)
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(define list-mode? (or (list? base-or-bases) (syntax->list base-or-bases)))
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(define bases (if list-mode?
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(or (syntax->list base-or-bases) base-or-bases)
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(list base-or-bases)))
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(define result (map (λ (base) (format-id (or ctx-arg base) "~a~a~a" (stx-join prefixes) (syntax-e base) (stx-join suffixes)
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#:source loc-arg)) bases))
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(if list-mode? result (car result)))
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(define (prefix-id #:source [loc-arg #f] #:context [ctx-arg #f] . args)
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((match-lambda
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[(list prefixes ... base-or-bases)
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(*fix-base loc-arg ctx-arg prefixes base-or-bases empty)]) args))
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(define (infix-id #:source [loc-arg #f] #:context [ctx-arg #f] . args)
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((match-lambda
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[(list prefix base-or-bases suffixes ...)
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(*fix-base loc-arg ctx-arg (list prefix) base-or-bases suffixes)]) args))
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(define (suffix-id #:source [loc-arg #f] #:context [ctx-arg #f] . args)
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((match-lambda
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[(list base-or-bases suffixes ...)
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(*fix-base loc-arg ctx-arg empty base-or-bases suffixes)]) args))
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(module+ test
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(define-check (check-stx-equal? stx1 stx2)
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(define stxs (list stx1 stx2))
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(apply equal? (map syntax->datum stxs)))
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(check-stx-equal? (prefix-id "foo" "bar" #'id) #'foobarid)
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(check-stx-equal? (infix-id "foo" #'id "bar" "zam") #'fooidbarzam)
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(check-stx-equal? (suffix-id #'id "foo" "bar" "zam") #'idfoobarzam)
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(for-each check-stx-equal? (suffix-id #'(this that) "@") (list #'this@ #'that@)))
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(define (syntax-srcloc stx)
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(srcloc (syntax-source stx)
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(syntax-line stx)
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(syntax-column stx)
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(syntax-position stx)
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(syntax-span stx))) |