public static Position CalculatePosition(SourceFile source, int pos)
{
if (pos >= source.Content.Length) {
throw new InvalidOperationException (
"The character position specified is not inside the provided content.");
}
var result = new Position () {
FileName = source.FileName,
Line = 1,
Column = 1
};
for (var i = 0; i <= pos; i++) {
var ch = source.Content [i];
if (ch == '\n') {
result.Line ++;
result.Column = 1;
}
if (ch != '\n' && ch != '\r') {
result.Column ++;
}
}
result.Column --;
return result;
}
internal static List<string> ExtractRelevantSource(
string[] sourceLines, Position startPos, Position endPos, string linePrefix = "")
{
var fileName = startPos.FileName;
var startLine = startPos.Line;
var endLine = endPos.Line;
var addEllipsis = endLine > startLine;
var firstLine = sourceLines[startLine - 1];
List<string> result = new List<string>();
StringBuilder sb1 = new StringBuilder();
sb1.AppendFormat("{0}file '{1}' line {2}: {3}", linePrefix, fileName, startLine, firstLine);
if (addEllipsis)
{
sb1.Append(" [...content snipped...]");
}
result.Add(sb1.ToString());
var underline = Utils.Underline(
Math.Max(startPos.Column, Utils.FirstNonBlank(firstLine)),
Math.Min(firstLine.Length, addEllipsis ? firstLine.Length : endPos.Column)
);
var underlinedLine = String.Format(
"{0}file '{1}' line {2}: {3}", linePrefix, fileName, startLine, underline);
result.Add(underlinedLine);
return result;
}