DocumentationAPI: Ignore triple quote strings

Ignore whole triple quoted string literal
DocComment.

Fixes #4631

coalib/bearlib/languages/documentation/DocumentationExtraction.py

@@ -246,4 +246,14 @@ def extract_documentation_with_markers(content, docstyle_definition):
             marker_dict,
             docstyle_definition)
         if doc:
-            yield doc
+            # Ignore string literals
+            ignore_regex = re.compile(
+                '^\s*r?(?P<marker>' +
+                ('|'.join(re.escape(s) for s in doc.marker[0])) +
+                ')')
+            # Starting line of doc_string where marker is present
+            start_line = doc.range.start.line - 1
+            ignore_string_match = ignore_regex.search(content[start_line])
+
+            if ignore_string_match:
+                yield doc

tests/bearlib/languages/documentation/DocBaseClassTest.py

@@ -246,6 +246,32 @@ def test_DocBaseClass_extraction_PYTHON3_3(self):
                                   docstyle_PYTHON3_doxygen.markers[1],
                                   TextPosition(1, 1))])
 
+    def test_DocBaseClass_extraction_PYTHON3_4(self):
+        data = ['\n', 'triple_quote_string_test = """\n',
+                'This is not a docstring\n', '"""\n']
+
+        docstyle_PYTHON3_default = DocstyleDefinition.load('PYTHON3',
+                                                           'default')
+
+        # Nothing is yielded as triple quote string literals are being
+        # ignored.
+        self.assertEqual(
+            list(DocBaseClass.extract(data, 'PYTHON3', 'default')),
+            [])
+
+    def test_DocBaseClass_extraction_PYTHON3_5(self):
+        data = ['r"""\n', 'This is a raw docstring\n', '"""\n']
+
+        docstyle_PYTHON3_default = DocstyleDefinition.load('PYTHON3',
+                                                           'default')
+
+        self.assertEqual(
+            list(DocBaseClass.extract(data, 'PYTHON3', 'default')),
+            [DocumentationComment('\nThis is a raw docstring\n',
+                                  docstyle_PYTHON3_default, 'r',
+                                  docstyle_PYTHON3_default.markers[0],
+                                  TextPosition(1, 2))])
+
     def test_generate_diff(self):
         data_old = ['\n', '""" documentation in single line  """\n']
         for doc_comment in DocBaseClass.extract(

tests/bearlib/languages/documentation/documentation_extraction_testdata/default.py

@@ -75,3 +75,8 @@ def foobar_triangle(side_A, side_B, side_C):
 
 
     return side_A + side_B + side_C
+
+    # This example of triple quote string literal is ignored.
+    triple_quote_string_literal_test = """
+This is a triple quoted string and is not a valid docstring.
+"""