93 lines
4.4 KiB
Scheme
93 lines
4.4 KiB
Scheme
(module structs scheme/base
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(provide (except-out (all-defined-out)
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set-choice-fail-messages!
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set-lazy-opts-matches!)
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)
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(require parser-tools/lex)
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;fail-src: (list line col pos span loc)
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;make-src-lst: position position -> src-list
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(define (make-src-lst start end)
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(list (position-line start)
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(position-col start)
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(position-offset start)
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(- (position-offset end)
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(position-offset start))))
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;(make-fail-type float fail-src string int int)
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(define-struct fail-type (chance src name used may-use) #:transparent #:mutable)
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;(make-terminal-fail float fail-src string symbol 'a)
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(define-struct (terminal-fail fail-type) (kind found))
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;(make-sequence-fail float fail-src string symbol (list string) string 'a boolean string)
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(define-struct (sequence-fail fail-type) (id kind correct expected found repeat? last-seen))
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;(make-choice-fail float fail-src string int (list string) (list fail-type) boolean)
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(define-struct (choice-fail fail-type) (options names ended? (messages #:mutable)) #:transparent)
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;(make-options-fail float #f #f (list fail-type))
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(define-struct (options-fail fail-type) ((opts #:mutable)))
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;result = res | choice-res | repeat-res | (listof (U res choice-res))
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;(make-res (U #f (listof 'b)) (listof 'a) (U string fail-type) (U string 'a) int) [U #f fail-type] token
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(define-struct res (a rest msg id used possible-error first-tok) #:transparent)
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;make-choice-res string (listof res) fail-type)
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(define-struct choice-res (name matches errors) #:transparent)
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;(make-repeat-res answer (U symbol fail-type))
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(define-struct repeat-res (a stop) #:transparent)
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;(make-lazy-opts (listof res) fail-type (listof (_ => res)))
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(define-struct lazy-opts ((matches #:mutable) errors (thunks #:mutable)) #:transparent)
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;(make-lazy-choice (listof res) fail-type (listof (_ -> res)) string)
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(define-struct (lazy-choice lazy-opts) (name) #:transparent)
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(define (update-choice-errors failc mss)
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(set-choice-fail-messages! failc (cons mss (choice-fail-messages failc)))
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(set-fail-type-chance! failc (max (fail-type-chance failc) (fail-type-chance mss)))
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(set-fail-type-used! failc (max (fail-type-used failc) (fail-type-used mss)))
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(set-fail-type-may-use! failc (max (fail-type-may-use failc) (fail-type-may-use mss))))
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(define (update-opt-errors failc mss)
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(set-options-fail-opts! failc (cons mss (options-fail-opts failc)))
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(set-fail-type-chance! failc (max (fail-type-chance failc) (fail-type-chance mss)))
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(set-fail-type-used! failc (max (fail-type-used failc) (fail-type-used mss)))
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(set-fail-type-may-use! failc (max (fail-type-may-use failc) (fail-type-may-use mss))))
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(define (make-force thunks set-thunks matches set-matches update-errors errors)
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(letrec ([next
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(lambda (lc)
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(printf "next-opt ~a~n" lc)
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(cond
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[(null? (thunks lc)) #f]
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[else
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(let ([curr-res ((car (thunks lc)))])
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(set-thunks lc (cdr (thunks lc)))
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(and curr-res
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(cond
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[(or (and (res? curr-res) (res-a curr-res))
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(repeat-res? curr-res)
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(choice-res? curr-res)
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(lazy-opts? curr-res)
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(and (lazy-choice? curr-res) (not (null? (lazy-opts-matches curr-res)))))
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(set-matches lc (cons curr-res (matches lc)))
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curr-res]
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[else
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(update-errors (errors lc)
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(cond
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[(res? curr-res) (res-msg curr-res)]
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[(lazy-choice? curr-res) (lazy-opts-errors curr-res)]))
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(next lc)])))]))])
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next))
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(define next-choice
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(make-force lazy-opts-thunks set-lazy-opts-thunks!
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lazy-opts-matches set-lazy-opts-matches!
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update-choice-errors lazy-opts-errors))
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(define next-opt
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(make-force lazy-opts-thunks set-lazy-opts-thunks!
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lazy-opts-matches set-lazy-opts-matches!
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update-opt-errors lazy-opts-errors))
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(define (fail-res rst msg) (make-res #f rst msg "" 0 #f #f))
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)
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