Method Highlight

Qt/Python/pqPythonSyntaxHighlighter.cxx:130–183

-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
QString pqPythonSyntaxHighlighter::Highlight(const QString& text) const
{
  int leadingWhiteSpaceLength = 0;
  int trailingWhiteSpaceLength = 0;
  while (leadingWhiteSpaceLength < text.length() && text.at(leadingWhiteSpaceLength).isSpace())
  {
    ++leadingWhiteSpaceLength;
  }

  QString result;
  if (this->PygmentsModule && leadingWhiteSpaceLength < text.length())
  {
    while (trailingWhiteSpaceLength < text.length() &&
      text.at(text.length() - 1 - trailingWhiteSpaceLength).isSpace())
    {
      ++trailingWhiteSpaceLength;
    }
    QString leadingWhitespace = text.left(leadingWhiteSpaceLength);
    QString trailingWhitespace = text.right(trailingWhiteSpaceLength);

    QByteArray bytes = text.trimmed().toUtf8();

    vtkPythonScopeGilEnsurer gilEnsurer;
    vtkSmartPyObject unicode(PyUnicode_DecodeUTF8(bytes.data(), bytes.size(), nullptr));
    vtkSmartPyObject args(Py_BuildValue("OOO", unicode.GetPointer(), this->PythonLexer.GetPointer(),
      this->HtmlFormatter.GetPointer()));
    vtkSmartPyObject resultingText(PyObject_Call(this->HighlightFunction, args, nullptr));

#if PY_VERSION_HEX >= 0x03070000
    char* resultingTextAsCString = const_cast<char*>(PyUnicode_AsUTF8(resultingText));
#else
    const char* resultingTextAsCString = PyUnicode_AsUTF8(resultingText);
#endif

    const QString pygmentsOutput = QString::fromUtf8(resultingTextAsCString);

    // the first span tag always should follow the pre tag like this; <pre ...><span
    const int startOfPre = pygmentsOutput.indexOf(">", pygmentsOutput.indexOf("<pre")) + 1;
    const int endOfPre = pygmentsOutput.lastIndexOf("</pre>");
    const QString startOfHtml = pygmentsOutput.left(startOfPre);
    const QString formatted = pygmentsOutput.mid(startOfPre, endOfPre - startOfPre).trimmed();
    const QString endOfHtml = pygmentsOutput.right(pygmentsOutput.length() - endOfPre).trimmed();

    // The <pre ...> tag will ignore a newline immediately following the >,
    // so insert one to be ignored.  Similarly, the </pre> will ignore a
    // newline immediately preceding it, so put one in.  These quirks allow
    // inserting newlines at the beginning and end of the text and took a
    // long time to figure out.
    result = QString("%1\n%2%3%4\n%5")
               .arg(startOfHtml, leadingWhitespace, formatted, trailingWhitespace, endOfHtml);
  }

  return result;
}

//-----------------------------------------------------------------------------
void pqPythonSyntaxHighlighter::ConnectHighligter() const