/// <summary>
/// Splits the provided segments into lines with a maximum width.
/// </summary>
/// <param name="context">The render context.</param>
/// <param name="segments">The segments to split into lines.</param>
/// <param name="maxWidth">The maximum width.</param>
/// <returns>A list of lines.</returns>
public static List <SegmentLine> SplitLines(RenderContext context, IEnumerable <Segment> segments, int maxWidth)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (segments is null)
{
throw new ArgumentNullException(nameof(segments));
}
var lines = new List <SegmentLine>();
var line = new SegmentLine();
var stack = new Stack <Segment>(segments.Reverse());
while (stack.Count > 0)
{
var segment = stack.Pop();
// Does this segment make the line exceed the max width?
if (line.CellCount(context) + segment.CellCount(context) > maxWidth)
{
var diff = -(maxWidth - (line.Length + segment.Text.Length));
var offset = segment.Text.Length - diff;
var(first, second) = segment.Split(offset);
line.Add(first);
lines.Add(line);
line = new SegmentLine();
if (second != null)
{
stack.Push(second);
}
continue;
}
// Does the segment contain a newline?
if (segment.Text.ContainsExact("\n"))
{
// Is it a new line?
if (segment.Text == "\n")
{
if (line.Length != 0 || segment.IsLineBreak)
{
lines.Add(line);
line = new SegmentLine();
}
continue;
}
var text = segment.Text;
while (text != null)
{
var parts = text.SplitLines();
if (parts.Length > 0)
{
if (parts[0].Length > 0)
{
line.Add(new Segment(parts[0], segment.Style));
}
}
if (parts.Length > 1)
{
if (line.Length > 0)
{
lines.Add(line);
line = new SegmentLine();
}
text = string.Concat(parts.Skip(1).Take(parts.Length - 1));
}
else
{
text = null;
}
}
}
else
{
line.Add(segment);
}
}
if (line.Count > 0)
{
lines.Add(line);
}
return(lines);
}
protected override IEnumerable <Segment> Render(RenderContext context, int maxWidth)
{
lock (_lock)
{
DidOverflow = false;
if (_renderable != null)
{
var segments = _renderable.Render(context, maxWidth);
var lines = Segment.SplitLines(segments);
var shape = SegmentShape.Calculate(context, lines);
if (shape.Height > _console.Profile.Height)
{
if (Overflow == VerticalOverflow.Crop)
{
if (OverflowCropping == VerticalOverflowCropping.Bottom)
{
// Remove bottom lines
var index = Math.Min(_console.Profile.Height, lines.Count);
var count = lines.Count - index;
lines.RemoveRange(index, count);
}
else
{
// Remove top lines
var start = lines.Count - _console.Profile.Height;
lines.RemoveRange(0, start);
}
shape = SegmentShape.Calculate(context, lines);
}
else if (Overflow == VerticalOverflow.Ellipsis)
{
var ellipsisText = _console.Profile.Capabilities.Unicode ? "…" : "...";
var ellipsis = new SegmentLine(((IRenderable) new Markup($"[yellow]{ellipsisText}[/]")).Render(context, maxWidth));
if (OverflowCropping == VerticalOverflowCropping.Bottom)
{
// Remove bottom lines
var index = Math.Min(_console.Profile.Height - 1, lines.Count);
var count = lines.Count - index;
lines.RemoveRange(index, count);
lines.Add(ellipsis);
}
else
{
// Remove top lines
var start = lines.Count - _console.Profile.Height;
lines.RemoveRange(0, start + 1);
lines.Insert(0, ellipsis);
}
shape = SegmentShape.Calculate(context, lines);
}
DidOverflow = true;
}
_shape = _shape == null ? shape : _shape.Value.Inflate(shape);
_shape.Value.Apply(context, ref lines);
foreach (var(_, _, last, line) in lines.Enumerate())
{
foreach (var item in line)
{
yield return(item);
}
if (!last)
{
yield return(Segment.LineBreak);
}
}
yield break;
}
_shape = null;
}
}