129 lines
5.3 KiB
Scheme
129 lines
5.3 KiB
Scheme
(define (join-adjacent type? type-append list)
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(let loop ((new-list '()) (list list))
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(if (null? list) (reverse new-list)
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(loop (if (and (not (null? new-list))
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(type? (car new-list))
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(type? (car list)))
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(cons (type-append (car new-list)
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(car list))
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(cdr new-list))
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(cons (car list) new-list))
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(cdr list)))))
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(define (join-adjacent-strings list)
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(join-adjacent string? string-append list))
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(define (vector-refs vec . indexes)
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(let loop ((obj vec) (indexes indexes))
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(if (null? indexes) obj
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(loop (vector-ref obj (car indexes))
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(cdr indexes)))))
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(define (pandoc-json->sxml json)
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(define (convert-block-or-inline element)
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(if (string? element) element (convert-block element)))
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(define (convert-block block)
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(let ((type (cdr (assq 't block))))
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(define (contents) (cdr (assq 'c block)))
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(define (contents-list) (vector->list (contents)))
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(cond ((equal? type "Space")
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" ")
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((equal? type "Str")
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(contents))
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((equal? type "BulletList")
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`(ul
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,@(map (lambda (list-element)
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`(li ,@(convert-many (vector->list list-element))))
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(contents-list))))
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((equal? type "BlockQuote")
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`(blockquote
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,@(convert-many (contents-list))))
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((equal? type "Code")
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`(code ,@(convert-many (cdr (contents-list)))))
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((equal? type "CodeBlock")
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`(pre (@ (data-syntax ,@(join-adjacent-strings
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(vector->list
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(vector-refs (contents) 0 1)))))
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,@(convert-many (cdr (contents-list)))))
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((equal? type "Emph")
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`(em ,@(convert-many (contents-list))))
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((equal? type "Header")
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(let* ((level (car (contents-list)))
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(h-tag (string->symbol
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(string-append
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"h" (number->string (inexact->exact level))))))
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`(,h-tag ,@(convert-many (vector->list
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(list-ref (contents-list) 2))))))
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((equal? type "Link")
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`(a (@ (href ,(join-adjacent-strings
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(vector->list (vector-ref (contents) 2)))))
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,@(convert-many (vector->list (vector-ref (contents) 1)))))
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((equal? type "Plain")
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`(span ,@(convert-many (contents-list))))
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((equal? type "Para")
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`(p ,@(convert-many (contents-list))))
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((equal? type "Quoted") ; TODO: What's this?
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`(blockquote
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,@(convert-many '())))
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((equal? type "SingleQuote") ; TODO: What's this?
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`(blockquote
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,@(convert-many '())))
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((equal? type "DoubleQuote") ; TODO: What's this?
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`(blockquote
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,@(convert-many '())))
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((equal? type "OrderedList") ; TODO: What's this?
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`(blockquote
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,@(convert-many '())))
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((equal? type "Superscript") ; TODO: What's this?
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`(blockquote
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,@(convert-many '())))
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((equal? type "SoftBreak")
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"\n")
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((equal? type "Strong")
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`(strong ,@(convert-many (contents-list))))
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((equal? type "Table")
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(let ((headings (vector-refs (contents) 3 1 0 1)))
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`(table
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(tr
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,@(map (lambda (cell)
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(let ((elements (vector->list
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(vector-refs cell 4))))
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`(th ,@(map convert-block-or-inline elements))))
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(vector->list headings)))
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,@(map (lambda (row)
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`(tr ,@(map (lambda (cell)
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(let ((elements
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(vector->list
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(vector-refs cell 4))))
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`(td ,@(map convert-block-or-inline
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elements))))
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(vector->list (vector-refs row 1)))))
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(vector->list (vector-refs (contents) 4 0 3))))))
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(else
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(error "Unknown type in pandoc JSON" type)))))
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(define (convert-many elements)
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(join-adjacent-strings (map convert-block-or-inline elements)))
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(define (assert-supported-version)
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(let* ((version (cdr (assq 'pandoc-api-version json)))
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(major (vector-ref version 0)))
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(unless (= major 1)
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(error "Pandoc API version is not 1.x" version))))
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(assert-supported-version)
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(convert-many (vector->list (cdr (assq 'blocks json)))))
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(define (pandoc-port->sxml input-format input-port)
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(pandoc-json->sxml (pandoc-port->json input-format input-port)))
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(define (pandoc-file->json input-format input-filename)
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(call-with-binary-input-file
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input-filename
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(lambda (input-port) (pandoc-port->json input-format input-port))))
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(define (pandoc-file->sxml input-format input-filename)
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(pandoc-json->sxml (pandoc-file->json input-format input-filename)))
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