/// <summary>
/// Throws ArgumentException, ContextMakingException.
/// </summary>
public DiffContext GetContext(DiffPosition position, ContextDepth depth)
{
if (!Context.Helpers.IsValidPosition(position))
{
throw new ArgumentException(
String.Format("Bad \"position\": {0}", position.ToString()));
}
if (!Context.Helpers.IsValidContextDepth(depth))
{
throw new ArgumentException(
String.Format("Bad \"depth\": {0}", depth.ToString()));
}
// If RightLine is valid, then it points to either added/modified or unchanged line, handle them the same way
bool isRightSideContext = position.RightLine != null;
int linenumber = isRightSideContext ? int.Parse(position.RightLine) : int.Parse(position.LeftLine);
string leftFilename = position.LeftPath;
string rightFilename = position.RightPath;
string leftSHA = position.Refs.LeftSHA;
string rightSHA = position.Refs.RightSHA;
FullContextDiffProvider provider = new FullContextDiffProvider(_git);
FullContextDiff context = provider.GetFullContextDiff(leftSHA, rightSHA, leftFilename, rightFilename);
Debug.Assert(context.Left.Count == context.Right.Count);
if (linenumber > context.Left.Count)
{
throw new ArgumentException(
String.Format("Line number {0} is greater than total line number count, invalid \"position\": {1}",
linenumber.ToString(), position.ToString()));
}
return(createDiffContext(linenumber, isRightSideContext, context, depth));
}
/// <summary>
/// Throws GitOperationException in case of problems with git.
/// </summary>
public FullContextDiff GetFullContextDiff(string leftSHA, string rightSHA,
string leftFileName, string rightFileName)
{
FullContextDiff fullContextDiff = new FullContextDiff
{
Left = new SparsedList <string>(),
Right = new SparsedList <string>()
};
List <string> fullDiff = _gitRepository.Diff(leftSHA, rightSHA, leftFileName, rightFileName, maxDiffContext);
if (fullDiff.Count == 0)
{
Trace.TraceWarning(String.Format(
"[FullContextDiffProvider] Context size is zero. LeftSHA: {0}, Right SHA: {1}, Left file: {2}, Right file: {3}",
leftSHA, rightSHA, leftFileName, rightFileName));
}
bool skip = true;
foreach (string line in fullDiff)
{
char sign = line[0];
if (skip)
{
// skip meta information about diff
if (sign == '@')
{
// next lines should not be skipped because they contain a diff itself
skip = false;
}
continue;
}
var lineOrig = line.Substring(1, line.Length - 1);
switch (sign)
{
case '-':
fullContextDiff.Left.Add(lineOrig);
fullContextDiff.Right.Add(null);
break;
case '+':
fullContextDiff.Left.Add(null);
fullContextDiff.Right.Add(lineOrig);
break;
case ' ':
fullContextDiff.Left.Add(lineOrig);
fullContextDiff.Right.Add(lineOrig);
break;
}
}
return(fullContextDiff);
}
/// <summary>
/// Throws ArgumentException, ContextMakingException.
/// </summary>
public DiffContext GetContext(DiffPosition position, ContextDepth depth, UnchangedLinePolicy unchangedLinePolicy)
{
if (!Context.Helpers.IsValidPosition(position))
{
throw new ArgumentException(
String.Format("Bad \"position\": {0}", position.ToString()));
}
if (!Context.Helpers.IsValidContextDepth(depth))
{
throw new ArgumentException(
String.Format("Bad \"depth\": {0}", depth.ToString()));
}
bool isRightSideContext = Helpers.IsRightSidePosition(position, unchangedLinePolicy);
int linenumber = isRightSideContext ? Helpers.GetRightLineNumber(position) : Helpers.GetLeftLineNumber(position);
string leftFilename = position.LeftPath;
string rightFilename = position.RightPath;
string leftSHA = position.Refs.LeftSHA;
string rightSHA = position.Refs.RightSHA;
try
{
FullContextDiff context = _git.FullContextDiffProvider.GetFullContextDiff(
leftSHA, rightSHA, leftFilename, rightFilename);
Debug.Assert(context.Left.Count == context.Right.Count);
if (linenumber > context.Left.Count)
{
throw new ArgumentException(
String.Format("Line number {0} is greater than total line number count, invalid \"position\": {1}",
linenumber.ToString(), position.ToString()));
}
return(createDiffContext(linenumber, isRightSideContext, context, depth));
}
catch (FullContextDiffProviderException ex)
{
throw new ContextMakingException("Cannot obtain full context diff", ex);
}
}
/// <summary>
/// Throws ContextMakingException.
/// </summary>
public FullContextDiff GetFullContextDiff(string leftSHA, string rightSHA,
string leftFileName, string rightFileName)
{
FullContextDiff fullContextDiff = new FullContextDiff(new SparsedList <string>(), new SparsedList <string>());
GitDiffArguments arguments = new GitDiffArguments(
GitDiffArguments.DiffMode.Context,
new GitDiffArguments.CommonArguments(leftSHA, rightSHA, leftFileName, rightFileName, null),
new GitDiffArguments.DiffContextArguments(Constants.FullContextSize));
IEnumerable <string> fullDiff;
try
{
fullDiff = _git?.ShowDiff(arguments);
}
catch (GitNotAvailableDataException ex)
{
throw new ContextMakingException("Cannot obtain git diff", ex);
}
if (fullDiff == null)
{
throw new ContextMakingException("Cannot obtain git diff", null);
}
if (fullDiff.Count() == 0)
{
Trace.TraceWarning(String.Format(
"[FullContextDiffProvider] Context size is zero. LeftSHA: {0}, Right SHA: {1}, Left file: {2}, Right file: {3}",
leftSHA, rightSHA, leftFileName, rightFileName));
}
bool skip = true;
foreach (string line in fullDiff)
{
char sign = line[0];
if (skip)
{
// skip meta information about diff
if (sign == '@')
{
// next lines should not be skipped because they contain a diff itself
skip = false;
}
continue;
}
var lineOrig = line.Substring(1, line.Length - 1);
switch (sign)
{
case '-':
fullContextDiff.Left.Add(lineOrig);
fullContextDiff.Right.Add(null);
break;
case '+':
fullContextDiff.Left.Add(null);
fullContextDiff.Right.Add(lineOrig);
break;
case ' ':
fullContextDiff.Left.Add(lineOrig);
fullContextDiff.Right.Add(lineOrig);
break;
}
}
return(fullContextDiff);
}
// isRightSideContext is true when linenumber corresponds to the right side (sha2).
// linenumber is one-based
private DiffContext createDiffContext(int linenumber, bool isRightSideContext, FullContextDiff context,
ContextDepth depth)
{
int startLineNumber = Math.Max(1, linenumber - depth.Up);
int endLineNumber = linenumber + depth.Down;
SparsedListIterator <string> itLeft = context.Left.Begin();
SparsedListIterator <string> itRight = context.Right.Begin();
if (isRightSideContext)
{
itRight = SparsedListUtils.FindNth(itRight, startLineNumber - 1);
itLeft = SparsedListUtils.Advance(itLeft, itRight.Position);
}
else
{
itLeft = SparsedListUtils.FindNth(itLeft, startLineNumber - 1);
itRight = SparsedListUtils.Advance(itRight, itLeft.Position);
}
int iContextLine = 0;
int selectedIndex = 0;
List <DiffContext.Line> lines = new List <DiffContext.Line>();
while (true)
{
int?leftLineNumber = itLeft.GetLineNumber() != null?itLeft.GetLineNumber() + 1 : null;
int?rightLineNumber = itRight.GetLineNumber() != null?itRight.GetLineNumber() + 1 : null;
DiffContext.Line line = getLineContext(leftLineNumber, rightLineNumber, itLeft.GetCurrent(), itRight.GetCurrent());
lines.Add(line);
if ((leftLineNumber.HasValue && !isRightSideContext && leftLineNumber == linenumber) ||
(rightLineNumber.HasValue && isRightSideContext && rightLineNumber == linenumber))
{
// zero-based index of a selected line in DiffContext.Lines
selectedIndex = iContextLine;
}
if ((leftLineNumber.HasValue && !isRightSideContext && leftLineNumber >= endLineNumber) ||
(rightLineNumber.HasValue && isRightSideContext && rightLineNumber >= endLineNumber))
{
// we've just reached a line that should not be included in the context
break;
}
if (!itLeft.Next() || !itRight.Next())
{
// we've just reached the end
break;
}
++iContextLine;
}
return(new DiffContext(lines, selectedIndex));
}
