// make it internal to enable unit testing
internal StackFrame GetStackFrame(string function, string file, int lineNumber)
{
var frame = new StackFrame { Function = function, File = file, Line = lineNumber };
if (string.IsNullOrEmpty(file))
{
return frame;
}
IEnumerable<string> lines = null;
if (File.Exists(file))
{
lines = File.ReadLines(file);
}
else
{
// Handle relative paths and embedded files
var fileInfo = _fileProvider.GetFileInfo(file);
if (fileInfo.Exists)
{
// ReadLines doesn't accept a stream. Use ReadLines as its more efficient
// relative to reading lines via stream reader
if (!string.IsNullOrEmpty(fileInfo.PhysicalPath))
{
lines = File.ReadLines(fileInfo.PhysicalPath);
}
else
{
lines = ReadLines(fileInfo);
}
}
}
if (lines != null)
{
ReadFrameContent(frame, lines, lineNumber, lineNumber);
}
return frame;
}
// make it internal to enable unit testing
internal void ReadFrameContent(
StackFrame frame,
IEnumerable<string> allLines,
int errorStartLineNumberInFile,
int errorEndLineNumberInFile)
{
// Get the line boundaries in the file to be read and read all these lines at once into an array.
var preErrorLineNumberInFile = Math.Max(errorStartLineNumberInFile - SourceCodeLineCount, 1);
var postErrorLineNumberInFile = errorEndLineNumberInFile + SourceCodeLineCount;
var codeBlock = allLines
.Skip(preErrorLineNumberInFile - 1)
.Take(postErrorLineNumberInFile - preErrorLineNumberInFile + 1)
.ToArray();
var numOfErrorLines = (errorEndLineNumberInFile - errorStartLineNumberInFile) + 1;
var errorStartLineNumberInArray = errorStartLineNumberInFile - preErrorLineNumberInFile;
frame.PreContextLine = preErrorLineNumberInFile;
frame.PreContextCode = codeBlock.Take(errorStartLineNumberInArray).ToArray();
frame.ContextCode = codeBlock
.Skip(errorStartLineNumberInArray)
.Take(numOfErrorLines)
.ToArray();
frame.PostContextCode = codeBlock
.Skip(errorStartLineNumberInArray + numOfErrorLines)
.ToArray();
}