Package suffixarray implements substring search in logarithmic time using an in-memory suffix array.
Example use:
// create index for some data index := suffixarray.New(data) // lookup byte slice s offsets1 := index.Lookup(s, -1) // the list of all indices where s occurs in data offsets2 := index.Lookup(s, 3) // the list of at most 3 indices where s occurs in data
Index implements a suffix array for fast substring search.
type Index struct {
// contains filtered or unexported fields
} func New(data []byte) *Index
New creates a new Index for data. Index creation time is O(N*log(N)) for N = len(data).
func (x *Index) Bytes() []byte
Bytes returns the data over which the index was created. It must not be modified.
func (x *Index) FindAllIndex(r *regexp.Regexp, n int) (result [][]int)
FindAllIndex returns a sorted list of non-overlapping matches of the regular expression r, where a match is a pair of indices specifying the matched slice of x.Bytes(). If n < 0, all matches are returned in successive order. Otherwise, at most n matches are returned and they may not be successive. The result is nil if there are no matches, or if n == 0.
func (x *Index) Lookup(s []byte, n int) (result []int)
Lookup returns an unsorted list of at most n indices where the byte string s occurs in the indexed data. If n < 0, all occurrences are returned. The result is nil if s is empty, s is not found, or n == 0. Lookup time is O(log(N)*len(s) + len(result)) where N is the size of the indexed data.
package main
import (
"fmt"
"index/suffixarray"
)
func main() {
index := suffixarray.New([]byte("banana"))
offsets := index.Lookup([]byte("ana"), -1)
for _, off := range offsets {
fmt.Println(off)
}
}
func (x *Index) Read(r io.Reader) error
Read reads the index from r into x; x must not be nil.
func (x *Index) Write(w io.Writer) error
Write writes the index x to w.
© Google, Inc.
Licensed under the Creative Commons Attribution License 3.0.
https://golang.org/pkg/index/suffixarray/