Handling of invalid values in the Search, Search, Replace and Replace methods (#370)

* Handling of invalid values in the Search, Search, Replace and Replace methods

* fix typo

Author: Ekopalypse

PythonScript/python_tests/tests/test_SearchReplaceInvalidArgumentTestCase.py

@@ -0,0 +1,22 @@
+# -*- coding: utf-8 -*-
+import unittest
+from Npp import notepad, editor
+
+class SearchReplaceInvalidArgumentTestCase(unittest.TestCase):
+    def setUp(self):
+        notepad.new()
+
+    def tearDown(self):
+        notepad.close()
+
+    def test_invalid_search_argument(self):
+        for invalid_arg in ["", None]:
+            for method in [editor.research, editor.search, editor.replace, editor.rereplace]:
+                self.assertRaises(TypeError, method, invalid_arg, None)
+
+    def test_invalid_replace_argument(self):
+        for method in [editor.replace, editor.rereplace]:
+            self.assertRaises(TypeError, method, "abc", None)
+
+
+suite = unittest.TestLoader().loadTestsFromTestCase(SearchReplaceInvalidArgumentTestCase)

PythonScript/src/ScintillaWrapper.cpp

@@ -808,6 +808,15 @@ void ScintillaWrapper::replaceImpl(boost::python::object searchStr, boost::pytho
 	intptr_t currentDocumentCodePage = this->GetCodePage();
 
 	std::string searchChars = extractEncodedString(searchStr, currentDocumentCodePage);
+
+	if (searchStr.is_none() || searchChars.empty()) {
+		throw NppPythonScript::ArgumentException("search parameter must not be none or an empty string");
+	}
+
+	if (replaceStr.is_none()) {
+		throw NppPythonScript::ArgumentException("replace parameter must not be none");
+	}
+
 	std::string replaceChars;
 	bool isPythonReplaceFunction = true;
 
@@ -953,6 +962,11 @@ void ScintillaWrapper::searchImpl(boost::python::object searchStr,
 
 	std::string searchChars = extractEncodedString(searchStr, currentDocumentCodePage);
 
+	if (searchStr.is_none() || searchChars.empty())
+	{
+		throw NppPythonScript::ArgumentException("search parameter must not be none or an empty string");
+	}
+
 	if (!PyCallable_Check(matchFunction.ptr()))
 	{
 		throw NppPythonScript::ArgumentException("match parameter must be callable, i.e. either a function or a lambda expression");
@@ -1076,4 +1090,4 @@ std::string ScintillaWrapper::iso_latin_1_to_utf8(const std::string& ansi_input)
 	return output;
 }
 
-}
+}

docs/source/scintilla.rst

@@ -5197,6 +5197,9 @@ Helper Methods
    See :meth:`editor.rereplace`, as this method is identical, with the exception that the search string is treated literally,
    and not as a regular expression.
 
+   The search argument triggers an exception if either an empty string or None is specified.
+   The replace argument triggers an exception if None is specified.
+
    If you use a function as the replace argument, the function will still receive a ``re.MatchObject`` like object as the parameter,
    ``group(0)`` will therefore always contain the string searched for (possibly in a different case if ``re.IGNORECASE`` was passed in the flags)
 
@@ -5233,6 +5236,8 @@ Helper Methods
    The replace function provided to editor.rereplace should not invoke additional calls to editor.rereplace or other replacement functions
    that modify the same text being processed. Doing so may result in unpredictable behavior.
 
+   The search argument triggers an exception if either an empty string or None is specified.
+   The replace argument triggers an exception if None is specified.
 
    ``flags`` are from the re module (e.g. ``re.IGNORECASE``), so ``import re`` if you use the flags.