Package suffixarray
Overview ?
Overview ?
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
- type Index
- func New(data []byte) *Index
- func (x *Index) Bytes() []byte
- func (x *Index) FindAllIndex(r *regexp.Regexp, n int) (result [][]int)
- func (x *Index) Lookup(s []byte, n int) (result []int)
- func (x *Index) Read(r io.Reader) error
- func (x *Index) Write(w io.Writer) error
Package files
qsufsort.go
suffixarray.go
type Index struct {
// contains filtered or unexported fields
}
Index implements a suffix array for fast substring search.
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 (*Index) Bytes
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 (*Index) Lookup
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.
func (*Index) Read
func (x *Index) Read(r io.Reader) error
Read reads the index from r into x; x must not be nil.
func (*Index) Write
func (x *Index) Write(w io.Writer) error
Write writes the index x to w.