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-#lang racket
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-
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-;; start with some basic utilities
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-(define (d n)
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- (random 1 (+ n 1)))
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-
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-;; the logic for judging the 'outcome' of an Ironsworn roll or progress track
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-(define (judge-outcome attempt challenge-1 challenge-2)
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- (let [(outcome
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- (cond [(and (> attempt challenge-1) (> attempt challenge-2))
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- 'success]
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- [(or (> attempt challenge-1) (> attempt challenge-2))
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- 'partial]
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- [else 'failure]))]
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- `(,outcome ,attempt (,challenge-1 ,challenge-2))))
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-
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-
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-;; a typical Ironsworn roll:
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-(define (roll-plus-mod m)
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- (let [
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- ;; roll two challenge dice
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- (challenge-1 (d 10))
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- (challenge-2 (d 10))
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- ;; roll an attempt die
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- (attempt (+ (d 6) m))]
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- ;; judge the outome
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- (judge-outcome attempt challenge-1 challenge-2)))
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-
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-
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-;; this just keeps us honest that this is playable with dice
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-(define *allowed-table-sizes* '(2 4 6 8 10 12 20 36 50 100))
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-
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-;; this is used in define-oracle to actually process the information, and ought to
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-;; return a zero-argument function that will roll on the table
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-;; TODO: also allow generating print structures from the same data!
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-(define (oracle table)
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- (cond [(andmap valid-oracle-result? table)
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- (if (member (length table) *allowed-table-sizes*)
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- (lambda () (car (shuffle table)))
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- (error 'oracle "Length ~a is not a die-size-compatible length" (length table)))]
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- [(andmap valid-table-member? table)
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- (let [(max (max-table-size table))]
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- (lambda () (table-index (d max) table)))]
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- [else (error 'oracle "Unexpected argument: ~a" table)]))
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-
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-;; given a range-based table, find the highest value to roll
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-(define (max-table-size table)
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- (let [(final (last table))]
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- (if (= (length final) 3) (cadr final) (car final))))
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-
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-;; true if the `thing` is a symbol or string
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-(define (valid-oracle-result? thing)
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- (or (symbol? thing) (string? thing)))
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-
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-;; true if the thing is a list of the form (num num string) or (num string)
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-(define (valid-table-member? member)
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- (and (list? member)
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- (or (and (= (length member) 3)
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- (number? (car member))
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- (number? (cadr member))
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- (valid-oracle-result? (caddr member)))
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- (and (= (length member) 2)
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- (number? (car member))
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- (valid-oracle-result? (cadr member))))))
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-
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-;; look up a number and find it in the table. (this assumes the table is sorted and
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-;; includes all possible values covered!
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-;; TODO: make this more resilient to bad input
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-(define (table-index idx table)
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- (if (null? table)
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- (error 'table-index "Unexpected empty table")
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- (let [(head (car table))]
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- (cond [(and (= (length head) 3)
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- (>= idx (car head))
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- (<= idx (cadr head)))
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- (caddr head)]
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- [(and (= (length head) 2)
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- (= idx (car head)))
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- (cadr head)]
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- [else (table-index idx (cdr table))]))))
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-
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-(define-syntax-rule [define-oracle name . table]
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- (define name (oracle (quote table))))
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-
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-;; create an asset
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-(define (asset name table)
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- (define (mk-feature feature)
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- (list (car feature) (smart-string-append (cdr feature))))
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- (let [(stuff (map mk-feature table))]
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- `(asset ,name ,stuff)))
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-
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-;; concatenate strings, adding whitespace if necessary
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-(define (smart-string-append list)
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- (define (ensure-leading-space str)
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- (if (char-whitespace? (string-ref str 0))
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- str
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- (string-append " " str)))
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- (apply string-append (cons (car list) (map ensure-leading-space (cdr list)))))
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-
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-
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-(define-syntax-rule [define-asset-path name . table]
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- (define name (asset (quote name) (quote table))))
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-
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-(provide judge-outcome roll-plus-mod oracle define-oracle define-asset-path)
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Getty Ritter