98 lines
2.3 KiB
Go
98 lines
2.3 KiB
Go
package wfa
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type IntegerSlice[T any] struct {
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data []T
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valid []bool
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defaultValue T
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}
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func (a *IntegerSlice[T]) TranslateIndex(idx int) int {
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if idx >= 0 { // 0 -> 0, 1 -> 2, 2 -> 4, 3 -> 6, ...
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return 2 * idx
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} else { // -1 -> 1, -2 -> 3, -3 -> 5, ...
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return (-2 * idx) - 1
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}
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}
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func (a *IntegerSlice[T]) Valid(idx int) bool {
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actualIdx := a.TranslateIndex(idx)
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if actualIdx < len(a.valid) { // idx is in the slice
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return a.valid[actualIdx]
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} else { // idx is out of the slice
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return false
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}
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}
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func (a *IntegerSlice[T]) Get(idx int) T {
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actualIdx := a.TranslateIndex(idx)
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if actualIdx < len(a.valid) { // idx is in the slice
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return a.data[actualIdx]
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} else { // idx is out of the slice
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return a.defaultValue
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}
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}
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func (a *IntegerSlice[T]) Set(idx int, value T) {
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actualIdx := a.TranslateIndex(idx)
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if actualIdx >= len(a.valid) { // idx is outside the slice
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// expand data array to actualIdx
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newData := make([]T, actualIdx+1)
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copy(newData, a.data)
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a.data = newData
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// expand valid array to actualIdx
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newValid := make([]bool, actualIdx+1)
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copy(newValid, a.valid)
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a.valid = newValid
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}
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a.data[actualIdx] = value
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a.valid[actualIdx] = true
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}
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type PositiveSlice[T any] struct {
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data []T
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valid []bool
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defaultValue T
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}
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func (a *PositiveSlice[T]) TranslateIndex(idx int) int {
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return idx
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}
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func (a *PositiveSlice[T]) Valid(idx int) bool {
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actualIdx := a.TranslateIndex(idx)
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if actualIdx >= 0 && actualIdx < len(a.valid) { // idx is in the slice
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return a.valid[actualIdx]
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} else { // idx is out of the slice
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return false
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}
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}
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func (a *PositiveSlice[T]) Get(idx int) T {
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actualIdx := a.TranslateIndex(idx)
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if actualIdx >= 0 && actualIdx < len(a.valid) { // idx is in the slice
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return a.data[actualIdx]
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} else { // idx is out of the slice
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return a.defaultValue
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}
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}
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func (a *PositiveSlice[T]) Set(idx int, value T) {
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actualIdx := a.TranslateIndex(idx)
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if actualIdx < 0 || actualIdx >= len(a.valid) { // idx is outside the slice
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// expand data array to actualIdx
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newData := make([]T, actualIdx+1)
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copy(newData, a.data)
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a.data = newData
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// expand valid array to actualIdx
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newValid := make([]bool, actualIdx+1)
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copy(newValid, a.valid)
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a.valid = newValid
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}
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a.data[actualIdx] = value
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a.valid[actualIdx] = true
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}
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