146 lines
3.3 KiB
Go
146 lines
3.3 KiB
Go
package wfa
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import (
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"math"
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"unicode/utf8"
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)
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func SafeMin(values []int, idx int) int {
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return values[idx]
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}
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func SafeMax(values []int, idx int) int {
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return values[idx]
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}
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func SafeArgMax(valids []bool, values []int) (bool, int) {
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hasValid := false
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maxIndex := 0
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maxValue := math.MinInt
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for i := 0; i < len(valids); i++ {
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if valids[i] && values[i] > maxValue {
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hasValid = true
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maxIndex = i
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maxValue = values[i]
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}
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}
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if hasValid {
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return true, maxIndex
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} else {
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return false, 0
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}
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}
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func SafeArgMin(valids []bool, values []int) (bool, int) {
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hasValid := false
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minIndex := 0
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minValue := math.MaxInt
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for i := 0; i < len(valids); i++ {
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if valids[i] && values[i] < minValue {
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hasValid = true
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minIndex = i
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minValue = values[i]
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}
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}
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if hasValid {
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return true, minIndex
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} else {
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return false, 0
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}
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}
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func Reverse(s string) string {
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size := len(s)
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buf := make([]byte, size)
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for start := 0; start < size; {
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r, n := utf8.DecodeRuneInString(s[start:])
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start += n
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utf8.EncodeRune(buf[size-start:], r)
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}
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return string(buf)
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}
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func Splice(s string, c rune, idx int) string {
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return s[:idx] + string(c) + s[idx:]
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}
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func NextLoHi(M WavefrontComponent, I WavefrontComponent, D WavefrontComponent, score int, penalties Penalty) (int, int) {
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x := penalties.X
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o := penalties.O
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e := penalties.E
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a_ok, a_lo, a_hi := M.GetLoHi(score - x)
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b_ok, b_lo, b_hi := M.GetLoHi(score - o - e)
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c_ok, c_lo, c_hi := I.GetLoHi(score - e)
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d_ok, d_lo, d_hi := D.GetLoHi(score - e)
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ok_lo, idx := SafeArgMin(
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[]bool{a_ok, b_ok, c_ok, d_ok},
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[]int{a_lo, b_lo, c_lo, d_lo},
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)
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lo := SafeMin([]int{a_lo, b_lo, c_lo, d_lo}, idx) - 1
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ok_hi, idx := SafeArgMax(
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[]bool{a_ok, b_ok, c_ok, d_ok},
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[]int{a_hi, b_hi, c_hi, d_hi},
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)
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hi := SafeMax([]int{a_hi, b_hi, c_hi, d_hi}, idx) + 1
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if ok_lo && ok_hi {
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M.SetLoHi(score, lo, hi)
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I.SetLoHi(score, lo, hi)
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D.SetLoHi(score, lo, hi)
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}
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return lo, hi
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}
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func NextI(M WavefrontComponent, I WavefrontComponent, score int, k int, penalties Penalty) {
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o := penalties.O
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e := penalties.E
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a_ok, a := M.GetVal(score-o-e, k-1)
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b_ok, b := I.GetVal(score-e, k-1)
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ok, nextITraceback := SafeArgMax([]bool{a_ok, b_ok}, []int{a, b})
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nextIVal := SafeMax([]int{a, b}, nextITraceback) + 1 // important that the +1 is here
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if ok {
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I.SetVal(score, k, nextIVal)
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I.SetTraceback(score, k, []traceback{OpenIns, ExtdIns}[nextITraceback])
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}
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}
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func NextD(M WavefrontComponent, D WavefrontComponent, score int, k int, penalties Penalty) {
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o := penalties.O
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e := penalties.E
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a_ok, a := M.GetVal(score-o-e, k+1)
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b_ok, b := D.GetVal(score-e, k+1)
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ok, nextDTraceback := SafeArgMax(
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[]bool{a_ok, b_ok},
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[]int{a, b},
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)
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nextDVal := SafeMax([]int{a, b}, nextDTraceback) // nothing special
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if ok {
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D.SetVal(score, k, nextDVal)
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D.SetTraceback(score, k, []traceback{OpenDel, ExtdDel}[nextDTraceback])
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}
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}
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func NextM(M WavefrontComponent, I WavefrontComponent, D WavefrontComponent, score int, k int, penalties Penalty) {
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x := penalties.X
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a_ok, a := M.GetVal(score-x, k)
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a++ // important to have +1 here
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b_ok, b := I.GetVal(score, k)
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c_ok, c := D.GetVal(score, k)
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ok, nextMTraceback := SafeArgMax([]bool{a_ok, b_ok, c_ok}, []int{a, b, c})
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nextMVal := SafeMax([]int{a, b, c}, nextMTraceback)
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if ok {
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M.SetVal(score, k, nextMVal)
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M.SetTraceback(score, k, []traceback{Sub, Ins, Del}[nextMTraceback])
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}
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}
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