public void SubtractSimple()
{
var textBuffer = CreateTextBuffer("A𠈓C");
var point = new SnapshotCodePoint(textBuffer.GetEndPoint());
AssertIt(point.Subtract(1), codePointInfo: CodePointInfo.SimpleCharacter, text: "C", position: 3);
AssertIt(point.Subtract(2), codePointInfo: CodePointInfo.SurrogatePairHighCharacter, text: "𠈓", position: 1);
AssertIt(point.Subtract(3), codePointInfo: CodePointInfo.SimpleCharacter, text: "A", position: 0);
}
public void SubtractAcrossLines()
{
var textBuffer = CreateTextBuffer("cat", "dog");
var point1 = new SnapshotCodePoint(textBuffer.GetPointInLine(line: 1, column: 0));
var point2 = point1.Subtract(2);
Assert.Equal(0, point2.Line.LineNumber);
}
public void SubtractKeepsLineReference()
{
var textBuffer = CreateTextBuffer("cat", "dog");
var point = new SnapshotCodePoint(textBuffer.GetStartPoint().GetContainingLine(), 4);
var line = point.Line;
while (point.StartPosition > 0)
{
point = point.Subtract(1);
Assert.Same(line, point.Line);
}
}
