/// <summary>
/// Measures the number of lines taken up by comments between two tokens.
/// </summary>
/// <param name="start">The start token.</param>
/// <param name="end">The end token.</param>
/// <param name="includeAttributes">Indicates whether to also count attributes.</param>
/// <returns>Returns the number of lines takes up by comments.</returns>
private static int MeasureCommentLinesBetween(CodeUnit start, CodeUnit end, bool includeAttributes)
{
Param.AssertNotNull(start, "start");
Param.AssertNotNull(end, "end");
Param.Ignore(includeAttributes);
int lineSpan = 0;
int previousLineSpan = -1;
int previousEndLineNumber = -1;
for (CodeUnit next = start.FindNext(); next != null && next != end; next = next.FindNext())
{
if (next.Is(LexicalElementType.Comment) || (next.Is(CodeUnitType.Attribute) && includeAttributes))
{
int itemLineSpan = ParameterPrewordOffset(next);
if (previousEndLineNumber > 0 && next.LineNumber == previousEndLineNumber && previousLineSpan > 0)
{
--itemLineSpan;
}
lineSpan += itemLineSpan;
previousLineSpan = itemLineSpan;
previousEndLineNumber = next.Location.EndPoint.LineNumber;
}
}
return(lineSpan);
}
/// <summary>
/// Gets the non-whitespace item that appears after the given item.
/// </summary>
/// <param name="item">The original item.</param>
/// <returns>Returns the next item.</returns>
private static CodeUnit GetNextNonWhitespaceItem(CodeUnit item)
{
Param.AssertNotNull(item, "item");
for (CodeUnit next = item.FindNext(); next != null; next = next.FindNext())
{
if (!next.Is(LexicalElementType.EndOfLine) && !next.Is(LexicalElementType.WhiteSpace))
{
return(next);
}
}
return(null);
}
/// <summary>
/// Gets the non-whitespace item that appears after the given item.
/// </summary>
/// <param name="item">The original item.</param>
/// <returns>Returns the next item.</returns>
private static CodeUnit GetNextNonWhitespaceItem(CodeUnit item)
{
Param.AssertNotNull(item, "item");
for (CodeUnit next = item.FindNext(); next != null; next = next.FindNext())
{
if (!next.Is(LexicalElementType.EndOfLine) && !next.Is(LexicalElementType.WhiteSpace))
{
return next;
}
}
return null;
}
/// <summary>
/// Measures the number of lines taken up by comments after the start item before the first word.
/// </summary>
/// <param name="start">The start item.</param>
/// <returns>Returns the number of lines takes up by comments.</returns>
private static int MeasureCommentLinesAfter(CodeUnit start)
{
Param.AssertNotNull(start, "start");
int lineSpan = 0;
int previousLineSpan = -1;
int previousEndLineNumber = -1;
for (CodeUnit next = start.FindNext(); next != null; next = next.FindNext())
{
if (next.Is(LexicalElementType.Comment) || next.Is(CodeUnitType.Attribute))
{
int itemLineSpan = ParameterPrewordOffset(next);
if (previousEndLineNumber > 0 && next.LineNumber == previousEndLineNumber && previousLineSpan > 0)
{
--itemLineSpan;
}
lineSpan += itemLineSpan;
previousLineSpan = itemLineSpan;
previousEndLineNumber = next.Location.EndPoint.LineNumber;
next = next.FindLast();
}
else if (!next.Is(LexicalElementType.WhiteSpace) &&
!next.Is(LexicalElementType.EndOfLine) &&
!next.Is(CodeUnitType.ParameterList) &&
!next.Is(CodeUnitType.ArgumentList) &&
!next.Is(CodeUnitType.Parameter) &&
!next.Is(CodeUnitType.Argument))
{
break;
}
}
return(lineSpan);
}
/// <summary>
/// Determines the amount of offset to add to the line number of the next argument
/// for a comment or attribute.
/// </summary>
/// <param name="item">The starting item.</param>
/// <returns>Returns the amount of offset to add.</returns>
private static int ParameterPrewordOffset(CodeUnit item)
{
Param.AssertNotNull(item, "tokenNode");
Debug.Assert(item.Is(CodeUnitType.Attribute) || item.Is(LexicalElementType.Comment), "The item must be an attribute or a comment.");
// Find the start of the next argument.
for (CodeUnit next = item.FindLast().FindNext(); next != null; next = next.FindNext())
{
if (next.Is(LexicalElementType.EndOfLine))
{
return(item.Location.LineSpan);
}
else if (!next.Is(LexicalElementType.WhiteSpace) &&
!next.Is(LexicalElementType.WhiteSpace) &&
!next.Is(CodeUnitType.Attribute))
{
return(Math.Max(0, next.Location.StartPoint.LineNumber - item.Location.StartPoint.LineNumber));
}
}
return(0);
}