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#lang racket/base
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(require "main.rkt")
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(require xml)
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#|
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The following grammar describes expressions that create X-expressions:
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xexpr = string
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| (list symbol (list (list symbol string) ...) xexpr ...)
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| (cons symbol (list xexpr ...))
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| symbol
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| valid-char?
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| cdata
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| misc
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|#
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;; recursively hyphenate strings within xexpr
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;; todo: add exclusion #:only [only-proc (λ(x) x)]
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(define (hyphenate-xexpr x )
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(define exclusions '(style script)) ; omit these from ever being hyphenated
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(cond
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; todo: the only-proc semantics are illogical.
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; main issue: keep it out of tags like <style> that parse as textual elements, but are not.
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; So two choices, opt-out or opt-in.
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; Problem with opt-out: is set of outlier tags like <style> well-defined?
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; Won't it make hyphenation naturally overinclusive?
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; Problem with opt-in: conceals a lot of tags that naturally live inside other tags
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; only reaches text at the "root level" of the tag.
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[(tagged-xexpr? x) (if (and (only-proc x) (not ((car x) . in? . exclusions)))
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(map-xexpr-elements hyphenate x)
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(map-xexpr-elements (λ(x) (if (tagged-xexpr? x) (hyphenate x) x)) x))] ; only process subxexprs
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[(string? x) (hyphenate-string x)]
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[else x]))
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