Function Example

private/attrrange/attrrange_test.go:25–54

()

)

func Example() {
	// Caller has a slice of some attributes, like a cell color that applies
	// to a portion of text.
	attrs := []cell.Color{cell.ColorRed, cell.ColorBlue}
	redIdx := 0
	blueIdx := 1

	// This is the text the colors apply to.
	const text = "HelloWorld"

	// Assuming that we want the word "Hello" in red and the word "World" in
	// green, we can set our ranges as follows:
	tr := NewTracker()
	if err := tr.Add(0, len("Hello"), redIdx); err != nil {
		panic(err)
	}
	if err := tr.Add(len("Hello")+1, len(text), blueIdx); err != nil {
		panic(err)
	}

	// Now to get the index into attrs (i.e. the color) for a particular
	// character, we can do:
	for i, c := range text {
		ar, err := tr.ForPosition(i)
		if err != nil {
			panic(err)
		}
		log.Printf("character at text[%d] = %q, color index %d = %v, range low:%d, high:%d", i, c, ar.AttrIdx, attrs[ar.AttrIdx], ar.Low, ar.High)
	}
}

func TestForPosition(t *testing.T) {
	tests := []struct {