48 lines
747 B
Go
48 lines
747 B
Go
package anagram
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import (
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"bufio"
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"io"
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"sort"
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"github.com/ray1729/puzzle-solver/util"
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)
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type DB interface {
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FindAnagrams(s string) []string
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Add(s string)
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}
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type HashDBImpl map[string][]string
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func New() HashDBImpl {
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return make(HashDBImpl)
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}
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func (db HashDBImpl) Add(s string) {
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k := toKey(s)
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db[k] = append(db[k], s)
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}
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func toKey(s string) string {
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xs := util.LowerCaseAlpha(s)
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sort.Slice(xs, func(i, j int) bool { return xs[i] < xs[j] })
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return string(xs)
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}
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func Load(r io.Reader) (DB, error) {
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db := New()
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sc := bufio.NewScanner(r)
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for sc.Scan() {
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db.Add(sc.Text())
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}
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if err := sc.Err(); err != nil {
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return nil, err
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}
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return db, nil
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}
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func (d HashDBImpl) FindAnagrams(s string) []string {
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return d[toKey(s)]
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}
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