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34 lines
1.1 KiB
34 lines
1.1 KiB
6 years ago
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# levenshtein
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levenshtein automaton
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This package makes it fast and simple to build a finite determinic automaton that computes the levenshtein distance from a given string.
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# Sample usage:
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```
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// build a re-usable builder
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lb := NewLevenshteinAutomatonBuilder(2, false)
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origTerm := "couchbasefts"
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dfa := lb.BuildDfa("couchbases", 2)
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ed := dfa.eval([]byte(origTerm))
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if ed.distance() != 2 {
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log.Errorf("expected distance 2, actual: %d", ed.distance())
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}
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```
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This implementation is inspired by [blog post](https://fulmicoton.com/posts/levenshtein/) and is intended to be
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a port of original rust implementation: https://github.com/tantivy-search/levenshtein-automata
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Micro Benchmark Results against the current vellum/levenshtein is as below.
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```
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BenchmarkNewEditDistance1-8 30000 52684 ns/op 89985 B/op 295 allocs/op
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BenchmarkOlderEditDistance1-8 10000 132931 ns/op 588892 B/op 363 allocs/op
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BenchmarkNewEditDistance2-8 10000 199127 ns/op 377532 B/op 1019 allocs/op
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BenchmarkOlderEditDistance2-8 2000 988109 ns/op 4236609 B/op 1898 allocs/op
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```
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