KumaChan/lang/source/span.go

package source

import "fmt"


type Span struct {
	Start  int
	End    int
}
func (span Span) Merged(another Span) Span {
	if span == (Span{}) {
		return another
	}
	if another == (Span{}) {
		return span
	}
	var merged = Span { Start: span.Start, End: another.End }
	if !(merged.Start <= merged.End) {
		panic(fmt.Sprintf("invalid span merge: %+v and %+v", span, another))
	}
	return merged
}
func (span Span) Contains(pos int) bool {
	return (span.Start <= pos && pos < span.End)
}
func (span Span) Size() int {
	return (span.End - span.Start)
}