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package codec
import (
"fmt"
)
// startEnd represents the start and end of some data. It mainly exists as a
// helper when referencing the values
type startEnd struct {
start int
end int
}
// sub subtracts the values of two startEnds
func (s startEnd) sub(o startEnd) startEnd {
return startEnd{
s.start - o.start,
s.end - o.end,
}
}
// add adds the values of two startEnds
func (s startEnd) add(o startEnd) startEnd {
return startEnd{
s.start + o.start,
s.end + o.end,
}
}
// overlaps returns true if two startEnds overlap
func (s startEnd) overlaps(o startEnd) bool {
return o.start <= s.end && o.end >= s.start
}
// contains returns true if the other is fully contained within this one
func (s startEnd) contains(o startEnd) bool {
return s.start <= o.start && o.end <= s.end
}
// overflow returns a startEnd that tells how much the other goes outside the
// bounds of this one
func (s startEnd) overflow(o startEnd) startEnd {
return s.merge(o).sub(s)
}
// merge takes two start/ends and returns a single one that encompases both
func (s startEnd) merge(o startEnd) startEnd {
return startEnd{
min(s.start, o.start),
max(s.end, o.end),
}
}
// String returns a string representation for clearer debugging
func (s startEnd) String() string {
return fmt.Sprintf("[%d,%d]", s.start, s.end)
}
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