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#lang typed/racket/base
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(require/typed sugar/list [slice-at ((Listof (U QuadAttrKey QuadAttrValue)) Positive-Integer . -> . (Listof (List QuadAttrKey QuadAttrValue)))])
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(require/typed racket/list [flatten (All (A) (Rec as (U Any (Listof as))) -> (Listof Any))])
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(require (for-syntax racket/syntax racket/base) racket/string (except-in racket/list flatten) sugar/debug racket/bool hyphenate racket/function math/flonum)
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(require "quads-typed.rkt" "world-typed.rkt" "measure-typed.rkt")
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;; predicate for use below
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(: list-of-mergeable-attrs? (Any . -> . Boolean))
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(define (list-of-mergeable-attrs? xs)
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(and (list? xs) (andmap (λ(x) (or (quad? x) (quad-attrs? x) (hashable-list? x))) xs)))
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;; faster than (listof pair?)
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(: pairs? (Any . -> . Boolean))
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(define (pairs? x) (and (list? x) (andmap pair? x)))
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;; push together multiple attr sources into one list of pairs.
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;; mostly a helper function for the two attr functions below.
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(provide join-attrs)
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(: join-attrs ((Listof (U Quad QuadAttrs HashableList)) . -> . (Listof QuadAttrPair)))
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(define (join-attrs quads-or-attrs-or-lists)
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((inst append-map QuadAttrPair QuadAttrs) (inst hash->list QuadAttrKey QuadAttrValue) (map (λ(x)
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(cond
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[(quad? x) (quad-attrs x)]
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[(quad-attrs? x) (cast x QuadAttrs)]
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[(hashable-list? x) (quadattrs (cast x (Listof Any)))]
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[else ;; something that will have no effect on result
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(cast (hash) QuadAttrs)])) quads-or-attrs-or-lists)))
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;; flatten merges attributes, but applies special logic suitable to flattening
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;; for instance, resolving x and y coordinates.
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(provide flatten-attrs)
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(: flatten-attrs ((U Quad QuadAttrs) * . -> . QuadAttrs))
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(define (flatten-attrs . quads-or-attrs-or-falses)
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(define all-attrs (join-attrs quads-or-attrs-or-falses))
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(define-values (x-attrs y-attrs other-attrs-reversed)
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(for/fold ([xas : (Listof QuadAttrPair) null]
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[yas : (Listof QuadAttrPair) null]
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[oas : (Listof QuadAttrPair) null])
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([attr (in-list all-attrs)])
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(cond
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[(equal? (car attr) world:x-position-key) (values (cons attr xas) yas oas)]
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[(equal? (car attr) world:y-position-key) (values xas (cons attr yas) oas)]
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[else (values xas yas (cons attr oas))])))
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(: make-cartesian-attr (QuadAttrKey (Listof QuadAttrPair) . -> . (Listof QuadAttrPair)))
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(define (make-cartesian-attr key attrs)
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(if (empty? attrs)
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empty
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(list (cons key (apply + (cast ((inst map QuadAttrValue QuadAttrPair) cdr attrs) (Listof Flonum)))))))
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(define x-attr (make-cartesian-attr world:x-position-key x-attrs))
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(define y-attr (make-cartesian-attr world:y-position-key y-attrs))
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(for/hash : QuadAttrs ([kv-pair (in-list (append x-attr y-attr (reverse other-attrs-reversed)))])
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(values (car kv-pair) (cdr kv-pair))))
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;; merge concatenates attributes, with later ones overriding earlier.
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;; most of the work is done by join-attrs.
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(provide merge-attrs)
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(: merge-attrs ((U Quad QuadAttrs HashableList) * . -> . QuadAttrs))
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(define (merge-attrs . quads-or-attrs-or-lists)
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(for/hash : QuadAttrs ([kv-pair (in-list (join-attrs quads-or-attrs-or-lists))])
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(values (car kv-pair) (cdr kv-pair))))
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;; pushes attributes down from parent quads to children,
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;; resulting in a flat list of quads.
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(provide flatten-quad)
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(: flatten-quad (Quad . -> . (Listof Quad)))
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(define (flatten-quad q)
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(cast (flatten
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(let loop : (Treeof Quad)
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([x : QuadListItem q][parent : Quad (box)])
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(cond
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[(quad? x)
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(let ([x-with-parent-attrs (quad (quad-name x)
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(flatten-attrs parent x) ; child positioned last so it overrides parent attributes
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(quad-list x))])
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(if (empty? (quad-list x))
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x-with-parent-attrs ; no subelements, so stop here
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((inst map (Treeof Quad) QuadListItem) (λ(xi) (loop xi x-with-parent-attrs)) (quad-list x))))] ; replace quad with its elements
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[else ;; it's a string
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(quad (quad-name parent) (quad-attrs parent) (list x))]))) (Listof Quad)))
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;; flatten quad as above,
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;; then dissolve it into individual character quads while copying attributes
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;; input is often large, so macro allows us to avoid allocation
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(provide split-quad)
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(: split-quad (Quad . -> . (Listof Quad)))
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(define (split-quad q)
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(: do-explode ((QuadListItem) (Quad) . ->* . (Treeof Quad)))
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(define (do-explode x [parent (box)])
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(cond
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[(quad? x)
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(if (empty? (quad-list x))
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x ; no subelements, so stop here
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((inst map (Treeof Quad) QuadListItem) (λ(xi) (do-explode xi x)) (quad-list x)))] ; replace quad with its elements, exploded
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[else ;; it's a string
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((inst map (Treeof Quad) QuadListItem) (λ(xc) (quad world:split-quad-key (quad-attrs parent) (list xc))) (regexp-match* #px"." x))]))
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(cast (flatten (map do-explode (flatten-quad q))) (Listof Quad)))
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;; merge chars into words (and boxes), leave the rest
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;; if two quads are mergeable types, and have the same attributes,
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;; they get merged.
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;; input is often large, so macro allows us to avoid allocation
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(provide join-quads)
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(define/typed (join-quads qs-in)
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((Listof Quad) . -> . (Listof Quad))
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(let ([make-matcher (λ ([base-q : Quad])
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(λ([q : Quad])
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(and (member (quad-name q) world:mergeable-quad-types)
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(not (whitespace/nbsp? q))
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;; if key doesn't exist, it is compared against the default value.
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;; this way, a nonexistent value will test true against a default value.
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(andmap (λ([key : Symbol] default) (equal? (quad-attr-ref base-q key default) (quad-attr-ref q key default)))
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(list world:font-name-key
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world:font-size-key
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world:font-weight-key
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world:font-style-key)
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(list (world:font-name-default)
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(world:font-size-default)
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(world:font-weight-default)
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(world:font-style-default))))))])
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(let loop ([qs qs-in][acc null])
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(if (null? qs)
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(reverse (cast acc (Listof Quad)))
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(let* ([base-q (first qs)]
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[mergeable-and-matches-base? (make-matcher base-q)]) ; make a new predicate function for this quad
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(cond
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[(mergeable-and-matches-base? base-q)
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;; take as many quads that match, using the predicate function
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(define-values (matching-qs other-qs) (splitf-at (cdr qs) mergeable-and-matches-base?))
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(define new-word (word (quad-attrs base-q) (string-append* (cast ((inst append-map QuadListItem Quad) quad-list (cons base-q matching-qs)) (Listof String)))))
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(loop other-qs (cons new-word acc))]
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;; otherwise move on to the next in line
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[else (loop (cdr qs) (cons base-q acc))]))))))
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;; propagate x and y adjustments throughout the tree,
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;; using parent x and y to adjust children, and so on.
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(provide compute-absolute-positions)
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(: compute-absolute-positions (Quad . -> . Quad))
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(define (compute-absolute-positions qli)
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(define result
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(let loop : QuadListItem ([qli : QuadListItem qli][parent-x : Flonum 0.0][parent-y : Flonum 0.0])
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(cond
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[(quad? qli)
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(define adjusted-x (round-float (+ (cast (quad-attr-ref qli world:x-position-key 0.0) Flonum) parent-x)))
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(define adjusted-y (round-float (+ (cast (quad-attr-ref qli world:y-position-key 0.0) Flonum) parent-y)))
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(quad (quad-name qli) (merge-attrs qli (list world:x-position-key adjusted-x world:y-position-key adjusted-y)) ((inst map QuadListItem QuadListItem) (λ(qlii) (loop qlii adjusted-x adjusted-y)) (quad-list qli)))]
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[else ;; it's a string
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qli])))
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(if (string? result)
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(error 'compute-absolute-positions "got string as result: ~v" result)
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result))
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;; functionally update a quad attr. Similar to hash-set
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(provide quad-attr-set)
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(: quad-attr-set (Quad QuadAttrKey QuadAttrValue . -> . Quad))
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(define (quad-attr-set q k v)
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(quad (quad-name q) (merge-attrs (quad-attrs q) (list k v)) (quad-list q)))
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;; functionally update multiple quad attrs. Similar to hash-set*
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(provide quad-attr-set*)
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(: quad-attr-set* (Quad (U QuadAttrKey QuadAttrValue) * . -> . Quad))
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(define (quad-attr-set* q . kvs)
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(for/fold ([current-q q])([kv-list (in-list (slice-at kvs 2))])
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(apply quad-attr-set current-q kv-list)))
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;; functionally remove a quad attr. Similar to hash-remove
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(provide quad-attr-remove)
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(: quad-attr-remove (Quad QuadAttrKey . -> . Quad))
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(define (quad-attr-remove q k)
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(if (quad-attrs q)
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(quad (quad-name q) (hash-remove (quad-attrs q) k) (quad-list q))
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q))
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;; functionally remove multiple quad attrs. Similar to hash-remove*
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(provide quad-attr-remove*)
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(: quad-attr-remove* (Quad QuadAttrKey * . -> . Quad))
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(define (quad-attr-remove* q . ks)
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(for/fold ([current-q q])([k (in-list ks)])
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(quad-attr-remove current-q k)))
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;; the last char of a quad
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(provide quad-last-char)
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(: quad-last-char (Quad . -> . (Option String)))
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(define (quad-last-char q)
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(define split-qs (split-quad q)) ; split makes it simple, but is it too expensive?
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(if (or (empty? split-qs) (empty? (quad-list (last split-qs))))
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#f
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(let ([result((inst car QuadListItem QuadListItem) (quad-list (last split-qs)))])
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(if (quad? result)
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(error 'quad-last-char "last element is not a string: ~v" result)
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result))))
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;; the first char of a quad
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(provide quad-first-char)
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(: quad-first-char (Quad . -> . (Option String)))
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(define (quad-first-char q)
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(define split-qs (split-quad q)) ; explosion makes it simple, but is it too expensive?
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(if (or (empty? split-qs) (empty? (quad-list (first split-qs))))
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#f
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(let ([result((inst car QuadListItem QuadListItem) (quad-list (first split-qs)))])
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(if (quad? result)
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(error 'quad-first-char "first element is not a string: ~v" result)
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result))))
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(provide split-last)
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(define (split-last xs)
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(let-values ([(first-list last-list) ((inst split-at-right Any) (cast xs (Listof Any)) 1)])
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(values first-list (car last-list))))
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;; like cons, but joins a list to an atom
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(provide snoc)
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(define-syntax-rule (snoc xs x)
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(append xs (list x)))
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