private static string GenerateRowField(string val, int width, int alignment, DisplayCells dc, bool addPadding)
{
// make sure the string does not have any embedded <CR> in it
string s = StringManipulationHelper.TruncateAtNewLine(val);
int currentValueDisplayLength = dc.Length(s);
if (currentValueDisplayLength < width)
{
// the string is shorter than the width of the column
// need to pad with with blanks to reach the desired width
int padCount = width - currentValueDisplayLength;
switch (alignment)
{
case TextAlignment.Right:
{
s = StringUtil.Padding(padCount) + s;
}
break;
case TextAlignment.Center:
{
// add a bit at both ends of the string
int padLeft = padCount / 2;
int padRight = padCount - padLeft;
s = StringUtil.Padding(padLeft) + s;
if (addPadding)
{
s += StringUtil.Padding(padRight);
}
}
break;
default:
{
if (addPadding)
{
// left align is the default
s += StringUtil.Padding(padCount);
}
}
break;
}
}
else if (currentValueDisplayLength > width)
{
// the string is longer than the width of the column
// truncate and add ellipsis if it's too long
int truncationDisplayLength = width - EllipsisSize;
if (truncationDisplayLength > 0)
{
// we have space for the ellipsis, add it
switch (alignment)
{
case TextAlignment.Right:
{
// get from "abcdef" to "...f"
s = s.VtSubstring(
startOffset: dc.TruncateHead(s, truncationDisplayLength),
prependStr: PSObjectHelper.EllipsisStr,
appendStr: null);
}
break;
default:
{
// left align is the default
// get from "abcdef" to "a..."
s = s.VtSubstring(
startOffset: 0,
length: dc.TruncateTail(s, truncationDisplayLength),
prependStr: null,
appendStr: PSObjectHelper.EllipsisStr);
}
break;
}
}
else
{
// not enough space for the ellipsis, just truncate at the width
switch (alignment)
{
case TextAlignment.Right:
{
// get from "abcdef" to "f"
s = s.VtSubstring(startOffset: dc.TruncateHead(s, width));
}
break;
default:
{
// left align is the default
// get from "abcdef" to "a"
s = s.VtSubstring(startOffset: 0, length: dc.TruncateTail(s, width));
}
break;
}
}
}
// we need to take into consideration that truncation left the string one
// display cell short if a double cell character got truncated
// in this case, we need to pad with a blank
int finalValueDisplayLength = dc.Length(s);
if (finalValueDisplayLength == width)
{
return(s);
}
switch (alignment)
{
case TextAlignment.Right:
{
s = " " + s;
}
break;
case TextAlignment.Center:
{
if (addPadding)
{
s += " ";
}
}
break;
default:
{
// left align is the default
if (addPadding)
{
s += " ";
}
}
break;
}
return(s);
}
