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#lang racket/base
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(require txexpr sugar/define racket/string)
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(define/contract+provide (make-default-tag-function . ids)
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(() #:rest txexpr-tags? . ->* . procedure?)
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(define (make-one-tag id)
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(λ x
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(define reversed-pieces ; list of attribute pairs, and last element holds a list of everything else, then reversed
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(reverse (let chomp ([x x])
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(define result+regexp (and ((length x) . >= . 2)
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(symbol? (car x))
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;; accept strings only
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;; numbers are difficult because they don't parse as cleanly.
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;; string will read as a string even if there's no space to the left.
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(or (string? (cadr x)))
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;; Looking for symbol ending with a colon
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(regexp-match #rx"^(.*?):$" (symbol->string (car x)))))
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(if result+regexp
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; reuse result value. cadr is first group in match.
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(cons (list (string->symbol (cadr result+regexp))(cadr x)) (chomp (cddr x)))
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(list x)))))
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(define-values (body attrs) (if (equal? null reversed-pieces)
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(values null null)
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(values (car reversed-pieces) (cdr reversed-pieces))))
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`(,id ,@(if (equal? attrs null) null (list (reverse attrs))) ,@body)))
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(procedure-rename (apply compose1 (map make-one-tag ids)) (string->symbol (format "pollen-tag:~a" (string-join (map symbol->string ids) "+")))))
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(define/contract+provide (split-attributes parts)
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(list? . -> . (values txexpr-attrs? txexpr-elements?))
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(define dummy-tag (gensym))
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(define dummy-txexpr (apply (make-default-tag-function dummy-tag) parts))
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(define-values (tag attrs elements) (txexpr->values dummy-txexpr))
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(values attrs elements))
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