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72 lines
2.3 KiB
Racket
72 lines
2.3 KiB
Racket
#lang racket/base
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(require (prefix-in rl: racket/list)
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"../private-lex/token-syntax.rkt")
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;; General helper routines
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(provide duplicate-list? remove-duplicates overlap? vector-andmap display-yacc)
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(define (vector-andmap pred vec)
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(for/and ([item (in-vector vec)])
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(pred vec)))
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;; duplicate-list?: symbol list -> #f | symbol
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;; returns a symbol that exists twice in l, or false if no such symbol
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;; exists
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(define (duplicate-list? syms)
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(rl:check-duplicates syms eq?))
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;; remove-duplicates: syntax-object list -> syntax-object list
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;; removes the duplicates from the lists
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(define (remove-duplicates syms)
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(rl:remove-duplicates syms equal? #:key syntax->datum))
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;; overlap?: symbol list * symbol list -> #f | symbol
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;; Returns an symbol in l1 intersect l2, or #f is no such symbol exists
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(define (overlap? syms1 syms2)
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(for/first ([sym1 (in-list syms1)]
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#:when (memq sym1 syms2))
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sym1))
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(define (display-yacc grammar tokens start precs port)
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(let-syntax ([p (syntax-rules ()
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((_ args ...) (fprintf port args ...)))])
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(let* ([tokens (map syntax-local-value tokens)]
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[eterms (filter e-terminals-def? tokens)]
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[terms (filter terminals-def? tokens)]
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[term-table (make-hasheq)]
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[display-rhs
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(λ (rhs)
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(for ([sym (in-list (car rhs))])
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(p "~a " (hash-ref term-table sym (λ () sym))))
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(when (= 3 (length rhs))
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(p "%prec ~a" (cadadr rhs)))
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(p "\n"))])
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(for* ([t (in-list eterms)]
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[t (in-list (syntax->datum (e-terminals-def-t t)))])
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(hash-set! term-table t (format "'~a'" t)))
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(for* ([t (in-list terms)]
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[t (in-list (syntax->datum (terminals-def-t t)))])
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(p "%token ~a\n" t)
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(hash-set! term-table t (format "~a" t)))
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(when precs
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(for ([prec (in-list precs)])
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(p "%~a " (car prec))
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(for ([tok (in-list (cdr prec))])
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(p " ~a" (hash-ref term-table tok)))
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(p "\n")))
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(p "%start ~a\n" start)
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(p "%%\n")
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(for ([prod (in-list grammar)])
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(define nt (car prod))
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(p "~a: " nt)
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(display-rhs (cadr prod))
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(for ([rhs (in-list (cddr prod))])
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(p "| ")
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(display-rhs rhs))
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(p ";\n"))
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(p "%%\n"))))
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