/// <summary>
/// Completely populate all Region property members. Missing data
/// is computed based on the values that are already present.
/// </summary>
/// <param name="region"></param>
/// <param name="newLineIndex"></param>
public static void Populate(this Region region, NewLineIndex newLineIndex)
{
if (region == null)
{
throw new ArgumentNullException(nameof(region));
}
if (newLineIndex == null)
{
throw new ArgumentNullException(nameof(newLineIndex));
}
// A call to Populate is an implicit indicator that we are working
// with a text region (otherwise the offset and length would be
// sufficient data to constitute the region).
if (region.StartLine == 0)
{
OffsetInfo offsetInfo = newLineIndex.GetOffsetInfoForOffset(region.Offset);
region.StartLine = offsetInfo.LineNumber;
region.StartColumn = offsetInfo.ColumnNumber;
offsetInfo = newLineIndex.GetOffsetInfoForOffset(region.Offset + region.Length);
region.EndLine = offsetInfo.LineNumber;
region.EndColumn = offsetInfo.ColumnNumber;
}
else
{
// Make endColumn and endLine explicit, if not expressed
if (region.EndLine == 0)
{
region.EndLine = region.StartLine;
}
if (region.StartColumn == 0)
{
region.StartColumn = 1;
}
if (region.EndColumn == 0)
{
region.EndColumn = region.StartColumn;
}
LineInfo lineInfo = newLineIndex.GetLineInfoForLine(region.StartLine);
region.Offset = lineInfo.StartOffset + (region.StartColumn - 1);
lineInfo = newLineIndex.GetLineInfoForLine(region.EndLine);
region.Length = lineInfo.StartOffset + (region.EndColumn - 1) - region.Offset;
}
}
private void PopulatePropertiesFromCharOffsetAndLength(NewLineIndex newLineIndex, Region region)
{
Assert(!region.IsBinaryRegion);
Assert(region.StartLine == 0);
Assert(region.CharLength >= 0 || region.CharOffset >= 0);
int startLine, startColumn, endLine, endColumn;
// Retrieve start and end line and column information from the new line index
OffsetInfo offsetInfo = newLineIndex.GetOffsetInfoForOffset(region.CharOffset);
startLine = offsetInfo.LineNumber;
startColumn = offsetInfo.ColumnNumber;
offsetInfo = newLineIndex.GetOffsetInfoForOffset(region.CharOffset + region.CharLength);
endLine = offsetInfo.LineNumber;
// The computation above points one past our actual region, because endColumn
// is exclusive of the region. This allows for length to easily be computed
// for single line regions: region.EndColumn - region.StartColumn
endColumn = offsetInfo.ColumnNumber;
// Only set values if they aren't already specified
if (region.StartLine == 0)
{
region.StartLine = startLine;
}
if (region.StartColumn == 0)
{
region.StartColumn = startColumn;
}
if (region.EndLine == 0)
{
region.EndLine = endLine;
}
if (region.EndColumn == 0)
{
region.EndColumn = endColumn;
}
// Validate cases where new line index disagrees with explicit values
Assert(region.StartLine == startLine);
Assert(region.StartColumn == startColumn);
Assert(region.EndLine == endLine);
Assert(region.EndColumn == endColumn);
}
