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124 lines
3.2 KiB
Markdown
124 lines
3.2 KiB
Markdown
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# go-patricia #
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**Documentation**: [GoDoc](http://godoc.org/github.com/tchap/go-patricia/patricia)<br />
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**Build Status**: [](https://drone.io/github.com/tchap/go-patricia/latest)<br />
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**Test Coverage**: [](https://coveralls.io/r/tchap/go-patricia)
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## About ##
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A generic patricia trie (also called radix tree) implemented in Go (Golang).
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The patricia trie as implemented in this library enables fast visiting of items
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in some particular ways:
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1. visit all items saved in the tree,
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2. visit all items matching particular prefix (visit subtree), or
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3. given a string, visit all items matching some prefix of that string.
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`[]byte` type is used for keys, `interface{}` for values.
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`Trie` is not thread safe. Synchronize the access yourself.
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### State of the Project ###
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Apparently some people are using this, so the API should not change often.
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Any ideas on how to make the library better are still welcome.
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More (unit) testing would be cool as well...
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## Usage ##
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Import the package from GitHub first.
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```go
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import "github.com/tchap/go-patricia/patricia"
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```
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You can as well use gopkg.in thingie:
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```go
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import "gopkg.in/tchap/go-patricia.v2/patricia"
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```
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Then you can start having fun.
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```go
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printItem := func(prefix patricia.Prefix, item patricia.Item) error {
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fmt.Printf("%q: %v\n", prefix, item)
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return nil
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}
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// Create a new default trie (using the default parameter values).
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trie := NewTrie()
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// Create a new custom trie.
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trie := NewTrie(MaxPrefixPerNode(16), MaxChildrenPerSparseNode(10))
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// Insert some items.
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trie.Insert(Prefix("Pepa Novak"), 1)
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trie.Insert(Prefix("Pepa Sindelar"), 2)
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trie.Insert(Prefix("Karel Macha"), 3)
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trie.Insert(Prefix("Karel Hynek Macha"), 4)
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// Just check if some things are present in the tree.
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key := Prefix("Pepa Novak")
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fmt.Printf("%q present? %v\n", key, trie.Match(key))
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// "Pepa Novak" present? true
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key = Prefix("Karel")
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fmt.Printf("Anybody called %q here? %v\n", key, trie.MatchSubtree(key))
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// Anybody called "Karel" here? true
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// Walk the tree in alphabetical order.
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trie.Visit(printItem)
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// "Karel Hynek Macha": 4
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// "Karel Macha": 3
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// "Pepa Novak": 1
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// "Pepa Sindelar": 2
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// Walk a subtree.
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trie.VisitSubtree(Prefix("Pepa"), printItem)
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// "Pepa Novak": 1
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// "Pepa Sindelar": 2
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// Modify an item, then fetch it from the tree.
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trie.Set(Prefix("Karel Hynek Macha"), 10)
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key = Prefix("Karel Hynek Macha")
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fmt.Printf("%q: %v\n", key, trie.Get(key))
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// "Karel Hynek Macha": 10
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// Walk prefixes.
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prefix := Prefix("Karel Hynek Macha je kouzelnik")
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trie.VisitPrefixes(prefix, printItem)
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// "Karel Hynek Macha": 10
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// Delete some items.
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trie.Delete(Prefix("Pepa Novak"))
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trie.Delete(Prefix("Karel Macha"))
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// Walk again.
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trie.Visit(printItem)
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// "Karel Hynek Macha": 10
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// "Pepa Sindelar": 2
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// Delete a subtree.
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trie.DeleteSubtree(Prefix("Pepa"))
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// Print what is left.
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trie.Visit(printItem)
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// "Karel Hynek Macha": 10
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```
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## License ##
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MIT, check the `LICENSE` file.
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[](https://www.gittip.com/tchap/
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"Gittip Badge")
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[](https://bitdeli.com/free
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"Bitdeli Badge")
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