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16 lines
562 B
Racket
16 lines
562 B
Racket
3 years ago
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#lang racket/base
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(provide (all-defined-out))
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(require syntax/stx)
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;; get-special-action: (syntax-object list) syntax-object syntax-object -> syntax-object
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;; Returns the first action from a rule of the form ((which-special) action)
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(define (get-special-action rules which-special none)
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(cond
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[(null? rules) none]
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[else
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(syntax-case (car rules) ()
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[((special) ACT)
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(and (identifier? #'special) (module-or-top-identifier=? #'special which-special))
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#'ACT]
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[_ (get-special-action (cdr rules) which-special none)])]))
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