/// <summary>
/// Ищет совпадающие абзацы в двух текстах
/// </summary>
/// <param name="inputtext"></param>
/// <param name="comptext"></param>
/// <returns></returns>
private string[] FindPlagiarism(string inputtext, string comptext)
{
var separator = new string[5];
try
{
separator[0] = "\n";
separator[1] = "\t";
separator[2] = "!";
separator[3] = "?";
separator[4] = ".";
var shift = 0;
if (testbutton.Checked || _splitinputtext == null)
{
_splitinputtext = inputtext.Split(separator, StringSplitOptions.RemoveEmptyEntries);
}
var split2 = comptext.Split(separator, StringSplitOptions.RemoveEmptyEntries);
var result = new string[_splitinputtext.Length];
foreach (string t in _splitinputtext)
{
foreach (string t1 in split2.Where(t1 => !(Shingles.CompareStrings(t, t1, 2) <= 40)))
{
result[shift++] = t1;
break;
}
}
return(result);
}
catch (Exception)
{
return(null);
}
}
/// <summary>
/// Определяет,был ли плагиат в исходном тексте
/// </summary>
/// /// <param name="filename"></param>
/// <returns>Степень совпадения и сплагиаченные предложения</returns>
private Results ShingleDetect(string filename)
{
const double similarityLow1Stage = 48;
const double similarityLow2Stage = 5.641;
string compText;
try
{
compText = ReadFile(filename);
}
catch
{
return(new Results(filename, 0, 0, "fail", false));
}
Monitor.Enter(_inputtextblock);
var fulltext = _inputText;
Monitor.Exit(_inputtextblock);
var similarity = new double[2];
var info = new FileInfo(filename);
similarity[0] = Shingles.CompareStrings(fulltext, compText, 1);
Results results;
string[] foundPlagiarism = null;
var fullResults = showFullResults.Checked;
if (fullResults)
{
foundPlagiarism = FindPlagiarism(fulltext, compText);
}
if (similarity[0] < similarityLow1Stage)
{
results = new Results(info.Name, similarity[0], 1, null, false);
if (fullResults)
{
results.PlagiarisedSentences = foundPlagiarism;
}
return(results);
}
similarity[1] = Shingles.CompareStrings(fulltext, compText, 3);
if (similarity[1] < similarityLow2Stage)
{
results = new Results(info.Name, similarity[1], 2, null, false);
if (fullResults)
{
results.PlagiarisedSentences = foundPlagiarism;
}
return(results);
}
results = new Results(info.Name, similarity[1], 2, null, true);
if (fullResults)
{
results.PlagiarisedSentences = foundPlagiarism;
}
return(results);
}