break;
case IPythonNature.GRAMMAR_PYTHON_VERSION_2_5:
grammar = new PythonGrammar25(generateTree, in);
break;
case IPythonNature.GRAMMAR_PYTHON_VERSION_2_6:
grammar = new PythonGrammar26(generateTree, in);
break;
case IPythonNature.GRAMMAR_PYTHON_VERSION_2_7:
grammar = new PythonGrammar27(generateTree, in);
break;
case IPythonNature.GRAMMAR_PYTHON_VERSION_3_0: