// leftLineNumber and rightLineNumber are one-based
private static DiffContext.Line getLineContext(int?leftLineNumber, int?rightLineNumber,
string leftLine, string rightLine)
{
DiffContext.Line.Side?leftSide = null;
DiffContext.Line.Side?rightSide = null;
string text = String.Empty;
if (leftLineNumber.HasValue && rightLineNumber.HasValue)
{
Debug.Assert(leftLine == rightLine);
leftSide = new DiffContext.Line.Side(leftLineNumber.Value, DiffContext.Line.State.Unchanged);
rightSide = new DiffContext.Line.Side(rightLineNumber.Value, DiffContext.Line.State.Unchanged);
text = leftLine;
}
else if (leftLineNumber.HasValue)
{
leftSide = new DiffContext.Line.Side(leftLineNumber.Value, DiffContext.Line.State.Changed);
text = leftLine;
}
else if (rightLineNumber.HasValue)
{
rightSide = new DiffContext.Line.Side(rightLineNumber.Value, DiffContext.Line.State.Changed);
text = rightLine;
}
else
{
Debug.Assert(false);
}
return(new DiffContext.Line(text, leftSide, rightSide));
}
// linenumber is one-based
private static DiffContext.Line getContextLine(int linenumber, bool isRightSideContext, string text)
{
DiffContext.Line line = new DiffContext.Line
{
Text = text
};
DiffContext.Line.Side side = new DiffContext.Line.Side
{
Number = linenumber,
// this 'maker' cannot distinguish between modified and unmodified lines
State = DiffContext.Line.State.Changed
};
if (isRightSideContext)
{
line.Right = side;
}
else
{
line.Left = side;
}
return(line);
}
// linenumber is one-based
private static DiffContext.Line getContextLine(int linenumber, bool isRightSideContext, string text)
{
// this 'maker' cannot distinguish between modified and unmodified lines
DiffContext.Line.Side side = new DiffContext.Line.Side(linenumber, DiffContext.Line.State.Changed);
return(new DiffContext.Line(text,
isRightSideContext ? new DiffContext.Line.Side?() : side,
isRightSideContext ? side : new DiffContext.Line.Side?()));
}
private static DiffContext.Line.Side getSide(int lineNumber, DiffContext.Line.State state)
{
DiffContext.Line.Side side = new DiffContext.Line.Side
{
Number = lineNumber,
State = state
};
return(side);
}
// linenumber is one-based
private DiffContext.Line getLineContext(int linenumber, bool isRightSideContext,
IEnumerable <string> contents, DiffPosition position)
{
Debug.Assert(linenumber > 0 && linenumber <= contents.Count());
// this maker supports all three states
DiffContext.Line.Side side = new DiffContext.Line.Side(
linenumber, getLineState(linenumber, isRightSideContext, position));
return(new DiffContext.Line(contents.ElementAt(linenumber - 1),
isRightSideContext ? new DiffContext.Line.Side?() : side,
isRightSideContext ? side : new DiffContext.Line.Side?()));
}