mirror of
https://github.com/ivanizag/izapple2.git
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72 lines
1.6 KiB
Go
72 lines
1.6 KiB
Go
package izapple2
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type trackTracer interface {
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traceTrack(quarterTrack int)
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}
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type trackTracerSummary struct {
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quarterTracks []int
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}
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func makeTrackTracerSummary() *trackTracerSummary {
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var tt trackTracerSummary
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tt.quarterTracks = make([]int, 0, 100)
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return &tt
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}
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func (tt *trackTracerSummary) traceTrack(quarterTrack int) {
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if tt == nil {
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return
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}
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length := len(tt.quarterTracks)
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if length == 0 {
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// Second change, just record
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tt.quarterTracks = append(tt.quarterTracks, quarterTrack)
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return
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}
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last := tt.quarterTracks[length-1]
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if quarterTrack == last {
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// No changes
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return
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}
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if length == 1 {
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// Second change, just record
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tt.quarterTracks = append(tt.quarterTracks, quarterTrack)
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return
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}
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// We don't want to registers the initial jumps around 0 seen when initializing the disk to track 0
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prevToLast := tt.quarterTracks[length-2]
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if length == 2 && prevToLast == 0 && (last == 1 || last == 2) && quarterTrack == 0 {
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tt.quarterTracks = tt.quarterTracks[0:0]
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}
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// We don't want to track each increment. If tracks goes from 1 to 14, we just want 1 and 14.
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wasGoingUp := last > prevToLast
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isGoingUp := quarterTrack > last
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if isGoingUp == wasGoingUp {
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// Same direction, update the last registry
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tt.quarterTracks[length-1] = quarterTrack
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} else {
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// Change direction, add a new registry
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tt.quarterTracks = append(tt.quarterTracks, quarterTrack)
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}
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}
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func (tt *trackTracerSummary) isTraceAsExpected(expected []int) bool {
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if len(tt.quarterTracks) != len(expected) {
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return false
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}
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for i, v := range tt.quarterTracks {
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if v != expected[i] {
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return false
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}
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}
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return true
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}
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