/// <summary>
/// Returns the Position after the last character in the file (including comments).
/// Throws an ArgumentException is file does not have any content.
/// </summary>
public static Position End(this FileContentManager file)
{
if (file.NrLines() == 0)
{
throw new ArgumentException("file is empty", nameof(file));
}
return(Position.Create(file.NrLines() - 1, file.GetLine(file.NrLines() - 1).Text.Length));
}
/// <summary>
/// Computes excess bracket errors for the given range of lines in file based on the corresponding CodeLine.
/// Throws an ArgumentOutOfRangeException if the range [start, start + count) is not within file.
/// </summary>
private static IEnumerable <Diagnostic> ComputeScopeDiagnostics(this FileContentManager file, int start, int count)
{
foreach (var line in file.GetLines(start, count))
{
foreach (var pos in line.ExcessBracketPositions)
{
yield return(Errors.ExcessBracketError(file.FileName, Position.Create(start, pos)));
}
++start;
}
}
/// <summary>
/// Returns the Position right after where the last relevant (i.e. non-comment) code in the file ends,
/// or the position (0,0) if no such line exists.
/// Throws an ArgumentException if file does not contain any lines.
/// </summary>
private static Position LastInFile(FileContentManager file)
{
if (file.NrLines() == 0)
{
throw new ArgumentException("file is null or missing content", nameof(file));
}
var endIndex = file.NrLines();
while (endIndex-- > 0 && file.GetLine(endIndex).WithoutEnding.Trim().Length == 0)
{
}
return(endIndex < 0
? Position.Zero
: Position.Create(endIndex, file.GetLine(endIndex).WithoutEnding.Length));
}
/// <summary>
/// Computes excess bracket errors for the given range of lines in file based on the corresponding CodeLine.
/// </summary>
/// <exception cref="ArgumentOutOfRangeException">The range [<paramref name="start"/>, <paramref name="start"/> + <paramref name="count"/>) is not within <paramref name="file"/>.</exception>
private static IEnumerable <Diagnostic> ComputeScopeDiagnostics(this FileContentManager file, int start, int count)
{
foreach (var line in file.GetLines(start, count))
{
foreach (var pos in line.ExcessBracketPositions)
{
yield return(Errors.ExcessBracketError(file.FileName, Position.Create(start, pos)));
}
foreach (var pos in line.ErrorDelimiterPositions)
{
yield return(Errors.InvalidCharacterInInterpolatedArgument(file.FileName, Position.Create(start, pos), file.GetLine(start).Text[pos]));
}
++start;
}
}
// routines used to compute scope diagnostics updates
/// <summary>
/// Given the total number of excess closings in the file
/// checks for both an unclosed scope and a missing string ending on lastLine, and adds the corresponding error(s) to updatedScopeErrors.
/// Throws an ArgumentException if the number of lines in the file is zero.
/// </summary>
private static IEnumerable <Diagnostic> CheckForMissingClosings(this FileContentManager file)
{
if (file.NrLines() == 0)
{
throw new ArgumentException("the number of lines in a file can never be zero");
}
var lastLine = file.GetLine(file.NrLines() - 1);
if (lastLine.FinalIndentation() > 0)
{
yield return(Errors.MissingClosingBracketError(file.FileName, Position.Create(file.NrLines() - 1, lastLine.Text.Length)));
}
if (ContinueString(lastLine))
{
yield return(Errors.MissingStringDelimiterError(file.FileName, Position.Create(file.NrLines() - 1, lastLine.Text.Length)));
}
}
static int MoveNextLine(ref Position position)
{
position = Position.Create(position.Line + 1, position.Column);
return(position.Line);
}