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brag/parser-tools/private-lex/stx.rkt

184 lines
8.3 KiB
Racket

#lang racket/base
(require yaragg/parser-tools/private-lex/util syntax/id-table racket/syntax)
(provide parse)
(define (bad-args stx num)
(raise-syntax-error #f (format "incorrect number of arguments (should have ~a)" num) stx))
;; char-range-arg: syntax-object syntax-object -> nat
;; If c contains is a character or length 1 string, returns the integer
;; for the character. Otherwise raises a syntax error.
(define (char-range-arg stx containing-stx)
(define c (syntax-e stx))
(cond
[(char? c) (char->integer c)]
[(and (string? c) (= (string-length c) 1))
(char->integer (string-ref c 0))]
[else
(raise-syntax-error
#f
"not a char or single-char string"
containing-stx stx)]))
(module+ test
(check-equal? (char-range-arg #'#\1 #'here) (char->integer #\1))
(check-equal? (char-range-arg #'"1" #'here) (char->integer #\1)))
(define orig-insp (variable-reference->module-declaration-inspector
(#%variable-reference)))
(define (disarm stx)
(syntax-disarm stx orig-insp))
;; parse : syntax-object (box (list-of syntax-object)) -> s-re (see re.rkt)
;; checks for errors and generates the plain s-exp form for s
;; Expands lex-abbrevs and applies lex-trans.
(define (parse stx)
(let loop ([stx stx]
;; seen-lex-abbrevs: id-table
[seen-lex-abbrevs (make-immutable-free-id-table)])
(let ([recur (λ (s)
(loop (syntax-rearm s stx)
seen-lex-abbrevs))]
[recur/abbrev (λ (s id)
(loop (syntax-rearm s stx)
(free-id-table-set seen-lex-abbrevs id id)))])
(syntax-case (disarm stx) (repetition union intersection complement concatenation
char-range char-complement)
[_
(identifier? stx)
(let ([expansion (syntax-local-value/record stx (λ (v) #t))])
(unless (lex-abbrev? expansion)
(raise-syntax-error 'regular-expression
"undefined abbreviation"
stx))
;; Check for cycles.
(when (free-id-table-ref seen-lex-abbrevs stx (λ () #f))
(raise-syntax-error 'regular-expression
"illegal lex-abbrev cycle detected"
stx
#f
(list (free-id-table-ref seen-lex-abbrevs stx))))
(recur/abbrev ((lex-abbrev-get-abbrev expansion)) stx))]
[_
(or (char? (syntax-e stx)) (string? (syntax-e stx)))
(syntax-e stx)]
[(repetition ARG ...)
(let ([arg-list (syntax->list #'(ARG ...))])
(unless (= 3 (length arg-list))
(bad-args stx 2))
(define low (syntax-e (car arg-list)))
(define high (syntax-e (cadr arg-list)))
(define re (caddr arg-list))
(unless (and (number? low) (exact? low) (integer? low) (>= low 0))
(raise-syntax-error #f "not a non-negative exact integer" stx (car arg-list)))
(unless (or (and (number? high) (exact? high) (integer? high) (>= high 0))
(eqv? high +inf.0))
(raise-syntax-error #f "not a non-negative exact integer or +inf.0" stx (cadr arg-list)))
(unless (<= low high)
(raise-syntax-error #f "the first argument is not less than or equal to the second argument" stx))
`(repetition ,low ,high ,(recur re)))]
[(union RE ...)
`(union ,@(map recur (syntax->list #'(RE ...))))]
[(intersection RE ...)
`(intersection ,@(map recur (syntax->list #'(RE ...))))]
[(complement RE ...)
(let ([re-list (syntax->list #'(RE ...))])
(unless (= 1 (length re-list))
(bad-args stx 1))
`(complement ,(recur (car re-list))))]
[(concatenation RE ...)
`(concatenation ,@(map recur (syntax->list #'(RE ...))))]
[(char-range ARG ...)
(let ((arg-list (syntax->list #'(ARG ...))))
(unless (= 2 (length arg-list))
(bad-args stx 2))
(let ([i1 (char-range-arg (car arg-list) stx)]
[i2 (char-range-arg (cadr arg-list) stx)])
(if (<= i1 i2)
`(char-range ,(integer->char i1) ,(integer->char i2))
(raise-syntax-error #f "the first argument does not precede or equal second argument" stx))))]
[(char-complement ARG ...)
(let ([arg-list (syntax->list #'(ARG ...))])
(unless (= 1 (length arg-list))
(bad-args stx 1))
(define parsed (recur (car arg-list)))
(unless (char-set? parsed)
(raise-syntax-error #f "not a character set" stx (car arg-list)))
`(char-complement ,parsed))]
((OP form ...)
(identifier? #'OP)
(let* ([expansion (syntax-local-value/record #'OP (λ (v) #t))])
(cond
[(lex-trans? expansion)
(recur ((lex-trans-f expansion) (disarm stx)))]
[expansion
(raise-syntax-error 'regular-expression "not a lex-trans" stx)]
[else
(raise-syntax-error 'regular-expression "undefined operator" stx)])))
[_ (raise-syntax-error 'regular-expression "not a char, string, identifier, or (op args ...)" stx)]))))
;; char-set? : s-re -> bool
;; A char-set is an re that matches only strings of length 1.
;; char-set? is conservative.
(define (char-set? s-re)
(cond
[(char? s-re)]
[(string? s-re) (= (string-length s-re) 1)]
[(list? s-re) (case (car s-re)
[(union intersection) (andmap char-set? (cdr s-re))]
[(char-range char-complement) #t]
[(repetition) (and (= 1 (cadr s-re) (caddr s-re)) (char-set? (cadddr s-re)))]
[(concatenation) (and (= 2 (length s-re)) (char-set? (cadr s-re)))]
(else #f))]
[else #f]))
(module+ test
(require rackunit)
(check-equal? (char-set? #\a) #t)
(check-equal? (char-set? "12") #f)
(check-equal? (char-set? "1") #t)
(check-equal? (char-set? '(repetition 1 2 #\1)) #f)
(check-equal? (char-set? '(repetition 1 1 "12")) #f)
(check-equal? (char-set? '(repetition 1 1 "1")) #t)
(check-equal? (char-set? '(repetition 6 6 "1")) #f)
(check-equal? (char-set? '(union "1" "2" "3")) #t)
(check-equal? (char-set? '(union "1" "" "3")) #f)
(check-equal? (char-set? '(intersection "1" "2" (union "3" "4"))) #t)
(check-equal? (char-set? '(intersection "1" "")) #f)
(check-equal? (char-set? '(complement "1")) #f)
(check-equal? (char-set? '(concatenation "1" "2")) #f)
(check-equal? (char-set? '(concatenation "" "2")) #f)
(check-equal? (char-set? '(concatenation "1")) #t)
(check-equal? (char-set? '(concatenation "12")) #f)
(check-equal? (char-set? '(char-range #\1 #\2)) #t)
(check-equal? (char-set? '(char-complement #\1)) #t))
;; yikes... these test cases all have the wrong arity, now.
;; and by "now", I mean it's been broken since before we
;; moved to git.
(module+ test
(check-equal? (parse #'#\a) #\a)
(check-equal? (parse #'"1") "1")
(check-equal? (parse #'(repetition 1 1 #\1))
'(repetition 1 1 #\1))
(check-equal? (parse #'(repetition 0 +inf.0 #\1)) '(repetition 0 +inf.0 #\1))
(check-equal? (parse #'(union #\1 (union "2") (union)))
'(union #\1 (union "2") (union)))
(check-equal? (parse #'(intersection #\1 (intersection "2") (intersection)))
'(intersection #\1 (intersection "2") (intersection)))
(check-equal? (parse #'(complement (union #\1 #\2)))
'(complement (union #\1 #\2)))
(check-equal? (parse #'(concatenation "1" "2" (concatenation)))
'(concatenation "1" "2" (concatenation)))
(check-equal? (parse #'(char-range "1" #\1)) '(char-range #\1 #\1))
(check-equal? (parse #'(char-range #\1 "1")) '(char-range #\1 #\1))
(check-equal? (parse #'(char-range "1" "3")) '(char-range #\1 #\3))
(check-equal? (parse #'(char-complement (union "1" "2")))
'(char-complement (union "1" "2")))
(check-equal? (parse #'(char-complement (repetition 1 1 "1")))
'(char-complement (repetition 1 1 "1")))
(check-exn #rx"not a character set"
(λ () (parse #'(char-complement (repetition 6 6 "1"))))))