78 lines
3.1 KiB
Factor
78 lines
3.1 KiB
Factor
USING: help.markup help.syntax kernel quotations
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deques search-deques hashtables ;
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IN: dlists
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ARTICLE: "dlists" "Double-linked lists"
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"A double-linked list is the canonical implementation of a " { $link deque } "."
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$nl
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"Double-linked lists form a class:"
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{ $subsections
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dlist
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dlist?
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}
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"Constructing a double-linked list:"
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{ $subsections <dlist> }
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"Double-linked lists support all the operations of the deque protocol (" { $link "deques" } ") as well as the following."
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$nl
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"Iterating over elements:"
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{ $subsections
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dlist-each
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dlist-find
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dlist-filter
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dlist-any?
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}
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"Deleting a node matching a predicate:"
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{ $subsections
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delete-node-if*
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delete-node-if
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}
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"Search deque implementation:"
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{ $subsections <hashed-dlist> } ;
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ABOUT: "dlists"
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HELP: <dlist>
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{ $values { "list" dlist } }
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{ $description "Creates a new double-linked list." } ;
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HELP: <hashed-dlist>
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{ $values { "search-deque" search-deque } }
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{ $description "Creates a new " { $link search-deque } " backed by a " { $link dlist } ", with a " { $link hashtable } " for fast membership tests." } ;
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HELP: dlist-any?
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{ $values { "dlist" { $link dlist } } { "quot" quotation } { "?" boolean } }
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{ $description "Just like " { $link dlist-find } " except it doesn't return the object." }
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{ $notes "This operation is O(n)." } ;
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HELP: dlist-find
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{ $values { "dlist" { $link dlist } } { "quot" quotation } { "obj/f" { $maybe object } } { "?" boolean } }
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{ $description "Applies the quotation to each element of the " { $link dlist } " in turn, until it outputs a true value or the end of the " { $link dlist } " is reached. Outputs either the object it found or " { $link f } ", and a boolean which is true if an object is found." }
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{ $notes "Returns a boolean to allow dlists to store " { $link f } "."
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$nl
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"This operation is O(n)."
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} ;
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HELP: dlist-filter
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{ $values { "dlist" dlist } { "quot" quotation } { "dlist'" dlist } }
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{ $description "Applies the quotation to each element of the " { $link dlist } " in turn, removing the corresponding nodes if the quotation returns " { $link f } "." }
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{ $side-effects { "dlist" } } ;
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HELP: dlist-length
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{ $values { "dlist" dlist } { "n" "a non-negative number" } }
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{ $description "Calculates the length of the linked list." }
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{ $notes "This operation is O(n)." } ;
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HELP: delete-node-if*
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{ $values { "dlist" { $link dlist } } { "quot" quotation } { "obj/f" { $maybe object } } { "?" boolean } }
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{ $description "Calls " { $link dlist-find } " on the " { $link dlist } " and deletes the node returned, if any. Returns the value of the deleted node and a boolean to allow the deleted value to distinguished from " { $link f } ", for nothing deleted." }
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{ $notes "This operation is O(n)." } ;
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HELP: delete-node-if
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{ $values { "dlist" { $link dlist } } { "quot" quotation } { "obj/f" { $maybe object } } }
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{ $description "Like " { $link delete-node-if* } " but cannot distinguish from deleting a node whose value is " { $link f } " or not deleting an element." }
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{ $notes "This operation is O(n)." } ;
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HELP: dlist-each
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{ $values { "dlist" { $link dlist } } { "quot" quotation } }
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{ $description "Iterate a " { $link dlist } ", calling quot on each element." } ;
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