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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 (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 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
char-set:whitespace))
(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 quantity-chars (char-set-difference text-chars (char-set #\} #\%)))
(define metadata-chars (char-set-difference text-chars (char-set #\:)))
(define-grammar cook
(nl ((+ ,newline-chars)))
(whitespace ((+ ,char-set:whitespace)))
(any-text-item ((: (=> c (+ ,any-text-chars)))
(list->string c)))
(text-item ((: (=> c (+ ,text-chars)))
(list->string c)))
(comment ((: "--" (=> c (+ ,any-text-chars)) ,nl)
(make-comment (list->string c)))
((: "[-" (=> c (* any)) "-]")
(make-comment (list->string c))))
(word ((=> w (+ ,word-chars))
(list->string w)))
(unit ((=> u (+ ,unit-chars))
(list->string u)))
(quantity ((=> q (+ ,quantity-chars))
(string->number (list->string q))))
(meta-key ((=> k (+ ,metadata-chars))
(list->string k)))
(amount ((: (=> q ,quantity) "%" (=> u ,unit))
(make-amount q u))
((=> q ,quantity)
(make-amount q #f)))
(no-word-component ((: (=> x (? ,component-chars))
"{" (? (=> a ,amount)) "}")
(make-component (list->string x) a)))
(component ((: (=> x (+ ,word)) (? (:"{" (=> a ,amount) "}")))
(make-component x a))
((: (=> x (+ ,component-chars)) "{" (? (=> a ,amount)) "}")
(make-component (list->string x) a)))
(timer ((: "~" (=> c (or ,component ,no-word-component)))
(component->timer c)))
(cookware ((: "#" (=> c ,component))
(component->cookware c)))
(ingredient ((: "@" (=> c ,component))
(component->ingredient c)))
(step ((: (=> s (+ (or ,ingredient
,cookware
,timer
,text-item)))
,nl)
(make-step s)))
(metadata ((: bol ">>" (* ,whitespace)
(=> k ,meta-key)
(* ,whitespace) ":" (* ,whitespace)
(=> v ,any-text-item) (* ,whitespace) ,nl)
(make-metadata-line k v)))
(recipe ((* (or (=> m (+ ,metadata))
(=> c (+ ,comment)))
(=> s (+ ,step)))
(list 'recipe (metadata-line-list->hash-table m) s))))
(define (parse-cook str)
(parse-fully recipe str))
|
