internal override Text AppendComplexText(ComplexText tail)
{
Debug.Assert(tail != null);
Debug.Assert(tail.Length > 0);
Debug.Assert(this.Length > 0);
var tailComponents = tail.texts;
var textComponents = new List <Text>();
if (IsComplexTextAppendableTo(tail))
{
textComponents.Add(this.AppendSimpleText((SimpleText)tailComponents[0]));
textComponents.AddRange(tailComponents.Skip(1));
}
else
{
textComponents.Add(this);
textComponents.AddRange(tailComponents);
}
if (textComponents.Count == 1)
{
return(textComponents[0]);
}
return(Text.Join(textComponents));
}
internal override Text AppendComplexText(ComplexText tail)
{
Debug.Assert(tail != null);
Debug.Assert(tail.Length > 0);
Debug.Assert(this.Length > 0);
var text = IsComplexTextAppendableTo(tail) ?
new ComplexText(
this.texts.Take(this.texts.Count - 1)
.Concat(new[] { this.texts.Last().AppendSimpleText((SimpleText)tail.texts.First()) })
.Concat(tail.texts.Skip(1)),
enableOptimizations: false) :
new ComplexText(
this.texts.Concat(tail.texts),
enableOptimizations: false);
var texts = text.texts;
if (texts.Count == 0)
{
return(Text.Empty);
}
if (texts.Count == 1)
{
return(text.texts[0]);
}
return(text);
}
internal override bool IsComplexTextAppendableTo(ComplexText tail)
{
Debug.Assert(tail != null);
Debug.Assert(tail.Length > 0);
Debug.Assert(this.Length > 0);
var firstTailComponent = tail.texts[0] as SimpleText;
return
(firstTailComponent != null &&
IsSimpleTextAppendableTo(firstTailComponent));
}
public static Text Join(IEnumerable <Text> texts)
{
texts.AssertNotNull();
var result = new ComplexText(texts);
var resultComponents = result.texts;
if (resultComponents.Count == 0)
{
return(Text.Empty);
}
if (resultComponents.Count == 1)
{
return(resultComponents[0]);
}
return(result);
}
internal abstract Text AppendComplexText(ComplexText tail);
internal abstract bool IsComplexTextAppendableTo(ComplexText tail);