trie

A Trie (Prefix Index) implementation in golang. It works fine with all unicode characters.

Documentation can be found at godoc.org.

Entries are reference counted: If you Add("foo") twice and Del("foo") it once it will still be found.

Example

t := trie.NewTrie()
t.Add("foo")
t.Add("bar")
t.PrintDump()

// output:
//  I:f (-)
// - V:oo (1)
// --- $
//  I:b (-)
// - V:ar (1)
// --- $

t.Add("foo")
t.PrintDump()

// output:
//  I:f (-)
// - V:oo (2)
// --- $
//  I:b (-)
// - V:ar (1)
// --- $

fmt.Println(t.Has("foo"))
// output: true

fmt.Println(t.HasCount("foo"))
// output: true 2

fmt.Println(t.Has("foobar"))
// output: false

fmt.Println(t.Members())
// output: [foo(2) bar(1)]

t.Add("food")
t.Add("foobar")
t.Add("foot")
fmt.Println(t.HasPrefix("foo"))
// output: true

fmt.Println(t.PrefixMembers("foo"))
// output: [foo(2) food(1) foobar(1) foot(1)]

A Trie can be dumped into a file with

t.DumpToFile("/tmp/trie_foo")

And loaded with

t2, _ := trie.LoadFromFile("/tmp/trie_foo")
fmt.Println(t2.Members())
// output: [foo(2) food(1) foobar(1) foot(1) bar(1)]

An existing Trie can be merged with a stored one with

t3 := trie.NewTrie()
t3.Add("フー")
t3.Add("バー")
t3.Add("日本語")
fmt.Println(t3.Members())
// output: [フー(1) バー(1) 日本語(1)]

t3.MergeFromFile("/tmp/trie_foo")
fmt.Println(t3.Members())
// output: [フー(1) バー(1) 日本語(1) foo(2) food(1) foobar(1) foot(1) bar(1)]