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ngram.go
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ngram.go
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package nlp
import (
"encoding/binary"
"github.com/koykov/bytealg"
)
type Unigram uint16
type Bigram uint32
type Trigram struct {
a, b, c Unigram
}
type Quadrigram uint64
type Fivegram struct {
a, b, c, d, e Unigram
}
// group: Unigram
func NewUnigram(r rune) Unigram {
return Unigram(r)
}
func (u Unigram) AppendTo(dst []byte) []byte {
off := len(dst)
dst = bytealg.GrowDelta(dst, 2)
binary.LittleEndian.PutUint16(dst[off:], uint16(u))
return dst
}
func (u Unigram) String() string {
r := [1]rune{rune(u)}
return string(r[:])
}
// endgroup: Unigram
// group: Bigram
func NewBigram(a, b rune) (n Bigram) {
u0, u1 := Unigram(a), Unigram(b)
n = Bigram(u0) << 16
n = n | Bigram(u1)
return
}
func (b Bigram) AppendTo(dst []byte) []byte {
off := len(dst)
dst = bytealg.GrowDelta(dst, 4)
binary.LittleEndian.PutUint32(dst[off:], uint32(b))
return dst
}
func (b Bigram) String() string {
r := [2]rune{rune(uint16(b >> 16)), rune(uint16(b))}
return string(r[:])
}
// endgroup: Bigram
// group: Trigram
func NewTrigram(a, b, c rune) Trigram {
return Trigram{Unigram(a), Unigram(b), Unigram(c)}
}
func (t Trigram) AppendTo(dst []byte) []byte {
off := len(dst)
dst = bytealg.GrowDelta(dst, 6)
binary.LittleEndian.PutUint16(dst[off:], uint16(t.a))
binary.LittleEndian.PutUint16(dst[off+2:], uint16(t.b))
binary.LittleEndian.PutUint16(dst[off+4:], uint16(t.c))
return dst
}
func (t Trigram) String() string {
r := [3]rune{rune(t.a), rune(t.b), rune(t.c)}
return string(r[:])
}
// endgroup: Trigram
// group: Quadrigram
func NewQuadrigram(a, b, c, d rune) (n Quadrigram) {
u0, u1, u2, u3 := Unigram(a), Unigram(b), Unigram(c), Unigram(d)
n = Quadrigram(u0) << 48
n = n | Quadrigram(u1)<<32
n = n | Quadrigram(u2)<<16
n = n | Quadrigram(u3)
return
}
func (q Quadrigram) AppendTo(dst []byte) []byte {
off := len(dst)
dst = bytealg.GrowDelta(dst, 8)
binary.LittleEndian.PutUint64(dst[off:], uint64(q))
return dst
}
func (q Quadrigram) String() string {
r := [4]rune{rune(uint16(q >> 48)), rune(uint16(q >> 32)), rune(uint16(q >> 16)), rune(uint16(q))}
return string(r[:])
}
// endgroup: Quadrigram
// group: Fivegram
func NewFivegram(a, b, c, d, e rune) Fivegram {
return Fivegram{Unigram(a), Unigram(b), Unigram(c), Unigram(d), Unigram(e)}
}
func (f Fivegram) AppendTo(dst []byte) []byte {
off := len(dst)
dst = bytealg.GrowDelta(dst, 10)
binary.LittleEndian.PutUint16(dst[off:], uint16(f.a))
binary.LittleEndian.PutUint16(dst[off+2:], uint16(f.b))
binary.LittleEndian.PutUint16(dst[off+4:], uint16(f.c))
binary.LittleEndian.PutUint16(dst[off+6:], uint16(f.d))
binary.LittleEndian.PutUint16(dst[off+8:], uint16(f.e))
return dst
}
func (f Fivegram) String() string {
r := [5]rune{rune(f.a), rune(f.b), rune(f.c), rune(f.d), rune(f.e)}
return string(r[:])
}
// endgroup: Fivegram