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42 lines
1.2 KiB
Racket
42 lines
1.2 KiB
Racket
#lang racket/base
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(require racket/contract racket/match racket/set)
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(require css-tools/html sugar txexpr)
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(require "world.rkt" "file-tools.rkt" "debug.rkt")
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(provide (all-from-out "file-tools.rkt"))
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;; test for well-formed meta
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(define+provide/contract (meta-xexpr? x)
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(any/c . -> . boolean?)
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(match x
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[`(meta ,(? string? key) ,(? string? value)) #t]
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[else #f]))
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;; initial set of block tags: from html
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(define project-block-tags block-tags)
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(define+provide/contract (append-block-tag tag)
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(txexpr-tag? . -> . void?)
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(set! project-block-tags (cons tag project-block-tags)))
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;; is the txexpr a block element (as opposed to inline)
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;; tags are inline unless they're registered as block tags.
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(define+provide/contract (block-xexpr? x)
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(any/c . -> . boolean?)
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;; (car x) = shorthand for tag of xexpr
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((txexpr? x) . and . ((car x) . in? . project-block-tags)))
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;; recursive whitespace test
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(define+provide/contract (whitespace? x)
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(any/c . -> . boolean?)
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(cond
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[(or (vector? x) (list? x) (set? x)) (andmap whitespace? (->list x))]
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[(equal? "" x) #t] ; empty string is deemed whitespace
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[(or (symbol? x) (string? x)) (->boolean (regexp-match #px"^\\s+$" (->string x)))]
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[else #f]))
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