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70 lines
1.7 KiB
Racket
70 lines
1.7 KiB
Racket
#lang racket/base
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(require sugar/define xml racket/match)
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(provide (all-defined-out) cdata? cdata valid-char? xexpr->string xexpr?)
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;; Section 2.2 of XML 1.1
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;; (XML 1.0 is slightly different and more restrictive)
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;; make private version of my-valid-char to get consistent results with 6.0
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(define (my-valid-char? i)
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(and (exact-nonnegative-integer? i)
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(or (<= #x1 i #xD7FF)
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(<= #xE000 i #xFFFD)
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(<= #x10000 i #x10FFFF))))
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(define (my-xexpr? x)
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(or (txexpr? x) (xexpr? x) (my-valid-char? x)))
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(define (txexpr-short? x)
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(match x
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[(list (? symbol? name) (? my-xexpr?) ...) #t]
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[else #f]))
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(define (txexpr? x)
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(or (txexpr-short? x)
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(match x
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[(list (? symbol?) (list (list (? symbol?) (? string?)) ...) (? my-xexpr?) ...) #t]
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[else #f])))
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(define (txexpr-tag? x)
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(symbol? x))
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(define (txexpr-tags? x)
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(and (list? x) (andmap txexpr-tag? x)))
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(define (txexpr-attr? x)
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(match x
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[(list (? symbol?) (? string?)) #t]
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[else #f]))
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(define (txexpr-attrs? x)
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(and (list? x) (andmap txexpr-attr? x)))
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(define (txexpr-element? x)
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(my-xexpr? x))
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(define (txexpr-elements? x)
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(and (list? x) (andmap txexpr-element? x)))
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(define (txexpr-attr-key? x)
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(symbol? x))
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(define (can-be-txexpr-attr-key? x)
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(or (symbol? x) (string? x)))
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(define (txexpr-attr-value? x)
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(string? x))
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(define (txexpr-attr-values? x)
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(and (list? x) (andmap txexpr-attr-value? x)))
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(define (can-be-txexpr-attr-value? x)
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(or (symbol? x) (string? x)))
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(define (can-be-txexpr-attrs? x)
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(ormap (λ(test) (test x)) (list txexpr-attr? txexpr-attrs? can-be-txexpr-attr-key? can-be-txexpr-attr-value?)))
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(define (list-of-can-be-txexpr-attrs? xs)
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(and (list? xs) (andmap can-be-txexpr-attrs? xs)))
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