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typesetting/pitfall/restructure/utils.rkt

11 lines
447 B
Racket

#lang restructure/racket
(provide (all-defined-out))
(require "number.rkt")
(define (resolveLength length [stream #f] [parent #f])
(cond
[(number? length) length]
[(procedure? length) (length parent)]
[(and parent (symbol? length)) (ref parent length)] ; treat as key into RStruct parent
[(and stream (NumberT? length)) (send length decode stream)]
[else (raise-argument-error 'resolveLength "fixed-size argument" length)]))