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#lang typed/racket/base
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(require (for-syntax typed/racket/base) typed/sugar/define)
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(require racket/match racket/string racket/list racket/bool "core-predicates.rkt")
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(provide (all-defined-out) (all-from-out "core-predicates.rkt"))
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(require typed/sugar/debug)
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(define/typed (validate-txexpr-attrs x #:context [txexpr-context #f])
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(Txexpr-Attrs [#:context Any] -> Txexpr-Attrs)
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(define/typed (make-reason)
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(-> String)
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(if (not (list? x))
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(format "because ~v is not a list" x)
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(let ([bad-attrs (filter (λ(i) (not (txexpr-attr? i))) x)])
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(format "because ~a ~a" (string-join (map (λ(ba) (format "~v" ba)) bad-attrs) " and ") (if (> (length bad-attrs) 1)
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"are not valid attributes"
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"is not in the form '(symbol \"string\")")))))
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(cond
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[(and (list? x) (> (length x) 0) (andmap txexpr-attr? x)) x]
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[else (error (string-append "validate-txexpr-attrs: "
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(if txexpr-context (format "in ~v, " txexpr-context) "")
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(format "~v is not a valid list of attributes ~a" x (make-reason))))]))
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(define/typed (validate-txexpr-element x #:context [txexpr-context #f])
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(Txexpr-Element [#:context Any] -> Txexpr-Element)
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(cond
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[(or (string? x) (txexpr? x) (symbol? x)
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(valid-char? x) (cdata? x)) x]
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[else (error (string-append "validate-txexpr-element: "
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(if txexpr-context (format "in ~v, " txexpr-context) "")
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(format "~v is not a valid element (must be txexpr, string, symbol, XML char, or cdata)" x)))]))
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;; is it a named x-expression?
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;; todo: rewrite this recurively so errors can be pinpointed (for debugging)
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(define/typed (validate-txexpr x)
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(Any -> (Option Txexpr))
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(define-syntax-rule (validate-txexpr-attrs-with-context e) (validate-txexpr-attrs e #:context x))
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(define-syntax-rule (validate-txexpr-element-with-context e) (validate-txexpr-element e #:context x))
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(cond
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[(txexpr-short? x) x]
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[(txexpr? x) (and
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(validate-txexpr-attrs-with-context (get-attrs x))
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(andmap (λ:([e : Txexpr-Element]) (validate-txexpr-element-with-context e)) (get-elements x)) x)]
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[else (error 'validate-txexpr (format "~v is not a list starting with a symbol" x))]))
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(define/typed make-txexpr
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(case-> (Symbol -> Txexpr)
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(Symbol Txexpr-Attrs -> Txexpr)
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(Symbol Txexpr-Attrs (Listof Txexpr-Element) -> Txexpr))
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(case-lambda
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[(tag) (make-txexpr tag null null)]
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[(tag attrs) (make-txexpr tag attrs null)]
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[(tag attrs elements)
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(define result (cons tag (append (if (empty? attrs) empty (list attrs)) elements)))
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(if (txexpr? result)
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result
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(error 'make-txexpr "This can't happen"))]))
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(define/typed (txexpr->values x)
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(Txexpr -> (values Txexpr-Tag Txexpr-Attrs Txexpr-Elements))
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(if (txexpr-short? x)
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(values (car x) '() (cdr x))
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(values (car x) (cadr x) (cddr x))))
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(define/typed (txexpr->list x)
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(Txexpr -> (List Txexpr-Tag Txexpr-Attrs Txexpr-Elements))
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(define-values (tag attrs content) (txexpr->values x))
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(list tag attrs content))
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;; convenience functions to retrieve only one part of txexpr
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(define/typed (get-tag x)
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(Txexpr -> Txexpr-Tag)
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(car x))
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(define/typed (get-attrs x)
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(Txexpr -> Txexpr-Attrs)
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(define-values (tag attrs content) (txexpr->values x))
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attrs)
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(define/typed (get-elements x)
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(Txexpr -> Txexpr-Elements)
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(define-values (tag attrs elements) (txexpr->values x))
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elements)
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;; helpers. we are getting a string or symbol
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(define/typed (->txexpr-attr-key x)
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(Can-Be-Txexpr-Attr-Key -> Txexpr-Attr-Key)
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(if (string? x) (string->symbol x) x))
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(define/typed (->txexpr-attr-value x)
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(Can-Be-Txexpr-Attr-Value -> Txexpr-Attr-Value)
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(->string x))
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(define/typed (->string x)
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((U Symbol String) -> String)
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(if (symbol? x) (symbol->string x) x))
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(define/typed (attrs->hash . items-in)
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(Can-Be-Txexpr-Attr * -> Txexpr-Attr-Hash)
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;; can be liberal with input because they're all just nested key/value pairs
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;; but still need this function to make sure that 'foo and "foo" are treated as the same hash key
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(define items (reverse
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(for/fold: ([items : (Listof (U Can-Be-Txexpr-Attr-Key Can-Be-Txexpr-Attr-Value)) null])
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([i (in-list items-in)])
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(cond
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[(txexpr-attr? i) (append (reverse i) items)]
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[(txexpr-attrs? i) (append (append* (map (λ:([a : Txexpr-Attr]) (reverse a)) i)) items)]
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[else (cons i items)]))))
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(define/typed (make-key-value-list items)
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((Listof (U Can-Be-Txexpr-Attr-Key Can-Be-Txexpr-Attr-Value)) -> (Listof (Pairof Txexpr-Attr-Key Txexpr-Attr-Value)))
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(if (< (length items) 2)
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null
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(let ([key (->txexpr-attr-key (car items))]
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[value (->txexpr-attr-value (cadr items))]
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[rest (cddr items)])
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(cons (cons key value) (make-key-value-list rest)))))
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(make-immutable-hash (make-key-value-list items)))
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(define/typed (hash->attrs attr-hash)
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(Txexpr-Attr-Hash -> Txexpr-Attrs)
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(map (λ:([k : Txexpr-Attr-Key]) (list k (hash-ref attr-hash k))) (hash-keys attr-hash)))
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(define/typed (attrs-have-key? x key)
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((U Txexpr-Attrs Txexpr) Can-Be-Txexpr-Attr-Key -> Boolean)
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(define attrs (if (txexpr-attrs? x) x (get-attrs x)))
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(hash-has-key? (attrs->hash attrs) (->txexpr-attr-key key)))
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(define/typed (attrs-equal? x1 x2)
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((U Txexpr-Attrs Txexpr) (U Txexpr-Attrs Txexpr) -> Boolean)
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(define attrs-tx1 (attrs->hash (if (txexpr-attrs? x1) x1 (get-attrs x1))))
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(define attrs-tx2 (attrs->hash (if (txexpr-attrs? x2) x2 (get-attrs x2))))
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(and
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(= (length (hash-keys attrs-tx1)) (length (hash-keys attrs-tx2)))
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(for/and ([(key value) (in-hash attrs-tx1)])
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(equal? (hash-ref attrs-tx2 key) value))))
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(define/typed (attr-set tx key value)
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(Txexpr Can-Be-Txexpr-Attr-Key Can-Be-Txexpr-Attr-Value -> Txexpr)
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(define new-attrs
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(hash->attrs (hash-set (attrs->hash (get-attrs tx)) (->txexpr-attr-key key) (->txexpr-attr-value value))))
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(make-txexpr (get-tag tx) new-attrs (get-elements tx)))
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(define/typed (attr-ref tx key)
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(Txexpr Can-Be-Txexpr-Attr-Key -> Txexpr-Attr-Value)
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(with-handlers ([exn:fail? (λ(e) (error (format "attr-ref: no value found for key ~v" key)))])
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(hash-ref (attrs->hash (get-attrs tx)) (->txexpr-attr-key key))))
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(define/typed (attr-ref* tx key)
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(Txexpr Can-Be-Txexpr-Attr-Key -> (Listof Txexpr-Attr-Value))
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(define: results : (Listof Txexpr-Attr-Value) empty)
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(let: loop : Void ([tx : Xexpr tx])
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(when (and (txexpr? tx) (attrs-have-key? tx key) (attr-ref tx key))
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(set! results (cons (attr-ref tx key) results))
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(map (λ:([e : Txexpr-Element]) (loop e)) (get-elements tx))
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(void)))
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(reverse results))
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;; convert list of alternating keys & values to attr
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(define/typed (merge-attrs . items)
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(Can-Be-Txexpr-Attr * -> Txexpr-Attrs)
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(define attrs-hash (apply attrs->hash items))
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;; sort needed for predictable results for unit tests
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(define sorted-hash-keys (sort (hash-keys attrs-hash) (λ:([a : Txexpr-Tag][b : Txexpr-Tag]) (string<? (->string a) (->string b)))))
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`(,@(map (λ:([key : Txexpr-Tag]) (list key (hash-ref attrs-hash key))) sorted-hash-keys)))
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(define/typed (remove-attrs x)
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(Xexpr -> Xexpr)
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(if (txexpr? x)
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(let-values ([(tag attr elements) (txexpr->values x)])
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(make-txexpr tag null (map remove-attrs elements)))
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x))
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(define/typed (map-elements/exclude proc x exclude-test)
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((Xexpr -> Xexpr) Xexpr (Xexpr -> Boolean) -> Xexpr)
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(cond
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[(txexpr? x)
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(if (exclude-test x)
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x
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(let-values ([(tag attr elements) (txexpr->values x)])
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(make-txexpr tag attr
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(map (λ:([x : Xexpr])(map-elements/exclude proc x exclude-test)) elements))))]
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;; externally the function only accepts txexpr,
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;; but internally we don't care
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[else (proc x)]))
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(define/typed (map-elements proc x)
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((Xexpr -> Xexpr) Xexpr -> Xexpr)
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(map-elements/exclude proc x (λ(x) #f)))
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;; function to split tag out of txexpr
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(define deleted-signal (gensym))
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(define/typed splitf-txexpr
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(case-> (Txexpr (Xexpr -> Boolean) -> (values Txexpr Txexpr-Elements))
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(Txexpr (Xexpr -> Boolean) (Xexpr -> Xexpr) -> (values Txexpr Txexpr-Elements)))
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(case-lambda
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[(tx pred) (splitf-txexpr tx pred (λ:([x : Xexpr]) deleted-signal))]
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[(tx pred proc)
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(define: matches : Txexpr-Elements null)
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(define/typed (do-extraction x)
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(Xexpr -> Xexpr)
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(cond
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[(pred x) (begin ; store matched item and return processed value
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(set! matches (cons x matches))
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(proc x))]
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[(txexpr? x) (let-values([(tag attr elements) (txexpr->values x)])
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(make-txexpr tag attr (filter (λ:([e : Xexpr]) (not (equal? e deleted-signal))) (map do-extraction elements))))]
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[else x]))
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(define: tx-extracted : Xexpr (do-extraction tx)) ;; do this first to fill matches
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(values (if (txexpr? tx-extracted)
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tx-extracted
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(error 'splitf-txexpr "Can't get here")) (reverse matches))]))
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(define/typed (xexpr->html x)
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(Xexpr -> String)
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(define/typed (->cdata x)
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(Xexpr -> Xexpr)
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(cond
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[(cdata? x) x]
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[(string? x) (cdata #f #f (format "<![CDATA[~a]]>" x))]
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[else x]))
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(xexpr->string (let: loop : Xexpr ([x : Xexpr x])
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(cond
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[(txexpr? x) (if (member (get-tag x) '(script style))
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(make-txexpr (get-tag x) (get-attrs x) (map ->cdata (get-elements x)))
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(make-txexpr (get-tag x) (get-attrs x) (map loop (get-elements x))))]
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[else x]))))
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