/**
* Tests the performance of MyersDiff for texts which are similar (not
* random data). The CPU time is measured and returned. Because of bad
* accuracy of CPU time information the diffs are repeated. During each
* repetition the interim CPU time is checked. The diff operation is
* repeated until we have seen the CPU time clock changed its value at least
* {@link #minCPUTimerTicks} times.
*
* @param characters
* the size of the diffed character sequences.
* @return performance data
*/
private PerfData test(int characters)
{
PerfData ret = new PerfData();
string a = DiffTestDataGenerator.generateSequence(characters, 971, 3);
string b = DiffTestDataGenerator.generateSequence(characters, 1621, 5);
CharArray ac = new CharArray(a);
CharArray bc = new CharArray(b);
MyersDiff myersDiff = null;
int cpuTimeChanges = 0;
long lastReadout = 0;
long interimTime = 0;
int repetitions = 0;
stopwatch.start();
while (cpuTimeChanges < minCPUTimerTicks && interimTime < longTaskBoundary)
{
myersDiff = new MyersDiff(ac, bc);
repetitions++;
interimTime = stopwatch.readout();
if (interimTime != lastReadout)
{
cpuTimeChanges++;
lastReadout = interimTime;
}
}
ret.runningTime = stopwatch.stop() / repetitions;
ret.N = (ac.size() + bc.size());
ret.D = myersDiff.getEdits().size();
return(ret);
}
public LineAndCommit[] Blame(Commit commit, string path)
{
var leaf = commit.Tree[path] as Leaf;
if (leaf == null)
{
throw new ArgumentException("The given path does not exist in this commit: " + path);
}
byte[] data = leaf.RawData;
IntList lineMap = RawParseUtils.lineMap(data, 0, data.Length);
var lines = new LineAndCommit[lineMap.size()];
var curText = new RawText(data);
Commit prevAncestor = commit;
Leaf prevLeaf = null;
Commit prevCommit = null;
int emptyLines = lineMap.size();
foreach (Commit ancestor in commit.Ancestors)
{
var cleaf = ancestor.Tree[path] as Leaf;
if (prevCommit != null && (cleaf == null || cleaf.Hash != prevLeaf.Hash))
{
byte[] prevData = prevLeaf.RawData;
if (prevData == null)
{
break;
}
var prevText = new RawText(prevData);
var differ = new MyersDiff(prevText, curText);
foreach (Edit e in differ.getEdits())
{
for (int n = e.BeginB; n < e.EndB; n++)
{
if (lines[n] == null)
{
lines[n] = CreateViewModel(GetLine(commit.Encoding, curText, n), prevCommit);
emptyLines--;
}
}
}
if (cleaf == null || emptyLines <= 0)
{
break;
}
}
prevCommit = ancestor;
prevLeaf = cleaf;
}
for (int n = 0; n < lines.Length; n++)
{
if (lines[n] == null)
{
lines[n] = CreateViewModel(GetLine(commit.Encoding, curText, n), prevAncestor);
}
}
return(lines);
}
public Commit[] Blame(string path)
{
Leaf leaf = Tree [path] as Leaf;
if (leaf == null)
{
throw new ArgumentException("The given path does not exist in this commit: " + path);
}
byte[] data = leaf.RawData;
int lineCount = RawParseUtils.lineMap(data, 0, data.Length).size();
Commit[] lines = new Commit [lineCount];
var curText = new RawText(data);
Commit prevAncestor = this;
Leaf prevLeaf = null;
Commit prevCommit = null;
int emptyLines = lineCount;
foreach (Commit ancestor in Ancestors)
{
Leaf cleaf = ancestor.Tree [path] as Leaf;
if (prevCommit != null && (cleaf == null || cleaf.Hash != prevLeaf.Hash))
{
byte[] prevData = prevLeaf.RawData;
if (prevData == null)
{
break;
}
var prevText = new RawText(prevData);
var differ = new MyersDiff(prevText, curText);
foreach (Edit e in differ.getEdits())
{
for (int n = e.BeginB; n < e.EndB; n++)
{
if (lines [n] == null)
{
lines [n] = prevCommit;
emptyLines--;
}
}
}
if (cleaf == null || emptyLines <= 0)
{
break;
}
}
prevCommit = ancestor;
prevLeaf = cleaf;
}
for (int n = 0; n < lines.Length; n++)
{
if (lines [n] == null)
{
lines [n] = prevAncestor;
}
}
return(lines);
}
/// <summary>
/// Creates a line-based diff from the the given byte arrays.
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
public Diff(byte[] a, byte[] b)
{
m_sequence_a = new Text(a);
m_sequence_b = new Text(b);
var diff = new MyersDiff((RawText)m_sequence_a, (RawText)m_sequence_b); // <--- using the undocumented cast operator of Text
m_edits = diff.getEdits();
}
public void assertDiff(string a, string b, string edits)
{
MyersDiff diff = new MyersDiff(toCharArray(a), toCharArray(b));
Assert.AreEqual(edits, toString(diff.getEdits()));
}
