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|
#|
https://github.com/cooklang/spec/blob/main/EBNF.md
|#
(define-record-type <amount>
(make-amount quantity unit)
amount?
(quantity amount-quantity)
(unit amount-unit))
(define-record-type <component>
(make-component name amount)
component?
(name component-name)
(amount component-amount))
(define-record-type <ingredient>
(make-ingredient name amount)
ingredient?
(name ingredient-name)
(amount ingredient-amount))
(define (component->ingredient comp)
(make-ingredient (component-name comp) (component-amount comp)))
(define-record-type <cookware>
(make-cookware name amount)
cookware?
(name cookware-name)
(amount cookware-amount))
(define (component->cookware comp)
(make-cookware (component-name comp) (component-amount comp)))
(define-record-type <timer>
(make-timer name amount)
timer?
(name timer-name)
(amount timer-amount))
(define (component->timer comp)
(make-timer (component-name comp) (component-amount comp)))
(define-record-type <metadata-line>
(make-metadata-line key value)
metadata-line?
(key metadata-line-key)
(value metadata-line-value))
(define-record-type <step>
(make-step elements)
step?
(elements step-elements))
(define-record-type <comment>
(make-comment text)
comment?
(text comment-text))
(define-record-type <recipe>
(make-recipe metadata body)
recipe?
(metadata recipe-metadata)
(body recipe-body))
(define (metadata-line-list->hash-table meta-lines)
(let ((metadata (make-hash-table)))
(for-each (lambda (line)
(hash-table-set! metadata
(metadata-line-key line)
(metadata-line-value line)))
meta-lines)
metadata))
(define (merge-step-strings lis)
(reduce-right
(lambda (el acc)
(cond
((char? el)
(if (and (< 0 (length acc)) (string? (car acc)))
(cons (string-append (string el) (car acc)) (cdr acc))
(append (list (string el)) acc)))
(else
(append (list el) acc))))
'()
lis))
(define whitespace-chars (char-set #\space))
(define newline-chars (char-set #\x000A #\x000D #\x0085 #\x2028 #\x2029))
(define punctuation-chars (char-set #\. #\{ #\})) ;; TODO: do it right
(define word-chars (char-set-difference char-set:full
punctuation-chars
newline-chars
whitespace-chars))
(define any-text-chars (char-set-difference char-set:full
newline-chars))
(define text-chars (char-set-difference any-text-chars
(char-set #\@ #\# #\~)))
(define unit-chars (char-set-difference text-chars (char-set #\})))
(define component-chars (char-set-difference text-chars
(char-set #\{ #\})))
(define component-word-chars (char-set-difference component-chars
newline-chars
whitespace-chars))
(define quantity-chars (char-set-difference text-chars (char-set #\} #\%)))
(define metadata-chars (char-set-difference text-chars (char-set #\:)))
(define-grammar cook
(one-nl (,(parse-map
(parse-sre `(: eol (+ ,newline-chars) bol))
(lambda _ '(#\space)))))
(nl ((: ,newline-chars)))
(whitespace ((=> x (+ ,whitespace-chars))
(list->string x)))
(any-text-item ((: (=> c (+ ,any-text-chars)))
(list->string c)))
(comment ((: "--" (=> c (+ ,any-text-chars)) (or eos ,nl))
(make-comment (list->string c)))
((: "[-" (=> c (* any)) "-]")
(make-comment (list->string c))))
(word ((=> w (+ ,word-chars))
w))
(unit ((=> u ,(parse-map-substring
(parse-repeat+ (parse-char unit-chars))
string-trim))
u))
(quantity ((=> q ,(parse-map-substring
(parse-repeat+ (parse-char quantity-chars))
string-trim))
(or (string->number q) q)))
(meta-key ((=> k (+ ,metadata-chars))
(list->string k)))
(amount ((: (=> q ,quantity) "%" (=> u ,unit))
(make-amount q u))
((=> q ,quantity)
(make-amount q #f)))
(amount-block ((: "{" (? (=> a ,amount)) "}")
a))
(no-word-component ((: (=> a ,amount-block))
(make-component #f a)))
(component-word ((=> w (+ ,component-word-chars))
(list->string w)))
(component ((: (=> cw ,component-word)
(? (: (=> cc (* ,component-chars))
(=> a ,amount-block))))
(make-component
(string-append cw (if cc (list->string cc) ""))
a)))
(timer ((: "~" (=> c (or ,component ,no-word-component)))
(component->timer c)))
(cookware ((: "#" (=> c ,component))
(component->cookware c)))
(ingredient ((: "@" (=> c ,component))
(component->ingredient c)))
(text-item ((=> t (+ (or ,comment
,ingredient
,cookware
,timer
,any-text-chars)))
t))
(step-line ((: (? ,whitespace)
(=> s (+ ,text-item))
(? ,nl))
(append! (concatenate! s))))
(step ((=> s (: ,step-line
,(parse-map
(parse-repeat
(parse-map ;; Add space where newline was
step-line (lambda x
(append '(#\space)
(concatenate x)))))
(lambda x (concatenate!
(concatenate! x))))))
(make-step (merge-step-strings (concatenate! s)))))
(metadata ((: bol ">>"
(=> k ,(parse-map meta-key string-trim))
(* ,whitespace) ":" (* ,whitespace)
(=> v ,(parse-map any-text-item string-trim))
(* ,whitespace) eol)
(make-metadata-line k v)))
(element ((or ,metadata ,comment ,step)))
(recipe ((=> els
(* (: ,element ,(parse-ignore
(parse-seq
(parse-repeat nl)
(parse-optional parse-end))))))
(concatenate! els))))
(define (parse-cook str)
(let ((lis (parse-fully recipe str)))
(let-values (((meta-lines body) (partition metadata-line? lis)))
(make-recipe (metadata-line-list->hash-table meta-lines) body))))
|
