package syntax

import "testing"

func TestMergeRanges(t *testing.T) {
	in := []lineRange{{start: 5, end: 8}, {start: 1, end: 2}, {start: 2, end: 4}, {start: 10, end: 10}}
	out := mergeRanges(in)

	if len(out) != 2 {
		t.Fatalf("expected 2 merged ranges, got %d", len(out))
	}
	if out[0].start != 1 || out[0].end != 8 {
		t.Fatalf("unexpected first merged range: %+v", out[0])
	}
	if out[1].start != 10 || out[1].end != 10 {
		t.Fatalf("unexpected second merged range: %+v", out[1])
	}
}

func TestNormalizedDirtyRanges(t *testing.T) {
	ranges := []lineRange{{start: -2, end: 1}, {start: 3, end: 99}}
	out := normalizedDirtyRanges(ranges, 5)

	if len(out) != 2 {
		t.Fatalf("expected 2 normalized ranges, got %d", len(out))
	}
	if out[0].start != 0 || out[0].end != 1 {
		t.Fatalf("unexpected first normalized range: %+v", out[0])
	}
	if out[1].start != 3 || out[1].end != 4 {
		t.Fatalf("unexpected second normalized range: %+v", out[1])
	}
}

func TestByteColToRuneIndexUTF8(t *testing.T) {
	line := []byte("aéb")

	if got := byteColToRuneIndex(line, 0); got != 0 {
		t.Fatalf("expected 0, got %d", got)
	}
	if got := byteColToRuneIndex(line, 1); got != 1 {
		t.Fatalf("expected 1, got %d", got)
	}
	if got := byteColToRuneIndex(line, 3); got != 2 {
		t.Fatalf("expected 2, got %d", got)
	}
	if got := byteColToRuneIndex(line, len(line)); got != 3 {
		t.Fatalf("expected 3, got %d", got)
	}
}