chore(_balanced_quotes_shadow): rewrite to return spans

This branch was intended to improves performance,
but my test results do not show meaningful enough performance improvements
to convince me to merge it into main branch.

tests/wikitext/test_get_bolds_and_italics.py

@@ -21,19 +21,10 @@ def test_get_bolds():
     assert_bold("'''b'''", "'''b'''")
     assert_no_bold("''i1'''s")
     assert_no_bold("<!--'''b'''-->")
-    assert_bold(
-        "a<!---->'<!---->'<!---->'<!---->" "b<!---->'<!---->'<!---->'<!---->d",
-        "'<!---->'<!---->'<!---->b<!---->'<!---->'<!---->'",
-    )
     assert_bold("'''b{{a|'''}}", "'''b{{a|'''}}")  # ?
     assert_bold("a'''b{{text|c|d}}e'''f", "'''b{{text|c|d}}e'''")
     assert_bold("{{text|'''b'''}}", "'''b'''")
     assert_bold("{{text|'''b}}", "'''b")  # ?
-    assert_bold("{{{PARAM|'''b}}} c", "'''b")  # ?
-    assert (
-        repr(parse("'''b\na'''c").get_bolds())
-        == """[Bold("'''b"), Bold("'''c")]"""
-    )
     assert_bold("'''<S>b</S>'''", "'''<S>b</S>'''")
     assert_bold("'''b<S>r'''c</S>", "'''b<S>r'''")
     assert_bold("'''''b'''i", "'''b'''")
@@ -53,19 +44,37 @@ def test_get_bolds():
     assert_bold("{{text|{{text|'''b'''}}}}", "'''b'''")
 
 
-def test_no_end_in_wikilink():
+def test_hald_bolds_with_newline_in_between():
+    assert (
+        repr(parse("'''b\na'''c").get_bolds())
+        == """[Bold("'''b"), Bold("'''c")]"""
+    )
+
+
+def test_half_bold_in_param():
+    assert_bold("{{{PARAM|'''b}}} c", "'''b")  # ?
+
+
+def test_half_bold_in_wikilink():
     assert_bold("[[a|'''b]] c", "'''b")
 
 
-def test_get_italics():
-    def ai(s: str, o: str, r: bool = True):
-        italics = parse(s).get_italics(r)
-        assert len(italics) == 1
-        assert italics[0].string == o
+def test_comment_before_and_after_bold():
+    assert_bold(
+        "a<!---->'<!---->'<!---->'<!---->" "b<!---->'<!---->'<!---->'<!---->d",
+        "'<!---->'<!---->'<!---->b<!---->'<!---->'<!---->'",
+    )
+
 
+def ai(s: str, o: str, r: bool = True):
+    italics = parse(s).get_italics(r)
+    assert len(italics) == 1
+    assert italics[0].string == o
+
+
+def test_get_italics():
     ai("''i'''", "''i'''")
     ai("a''' '' b '' '''c", "'' b ''")
-    ai("'''''i'''''", "'''''i'''''")
     ai("a'' ''' ib ''' ''c", "'' ''' ib ''' ''")
     ai("''i''", "''i''")
     ai(
@@ -81,6 +90,10 @@ def ai(s: str, o: str, r: bool = True):
     ai("''' ''i'''", "''i'''")
 
 
+def test_get_italics_2():
+    ai("'''''i'''''", "'''''i'''''")
+
+
 def test_bold_italic_index_change():
     p = parse("'''b1''' ''i1'' '''b2'''")
     b1, b2 = p.get_bolds(recursive=False)

wikitextparser/_comment_bold_italic.py

@@ -49,7 +49,7 @@ def text(self, s: str):
         self[b:e] = s
 
     @property
-    def _content_span(self) -> Tuple[int, int]:
+    def _relative_content_span(self) -> Tuple[int, int]:
         # noinspection PyUnresolvedReferences
         return self._match.span(1)
 

wikitextparser/_parameter.py

@@ -104,5 +104,5 @@ def parameters(self) -> List['Parameter']:
         return super().parameters[1:]
 
     @property
-    def _content_span(self) -> Tuple[int, int]:
+    def _relative_content_span(self) -> Tuple[int, int]:
         return 3, -3

wikitextparser/_parser_function.py

@@ -19,7 +19,7 @@ class SubWikiTextWithArgs(SubWikiText):
     _first_arg_sep = 0
 
     @property
-    def _content_span(self) -> Tuple[int, int]:
+    def _relative_content_span(self) -> Tuple[int, int]:
         return 2, -2
 
     @property

wikitextparser/_tag.py

@@ -214,6 +214,6 @@ def get_tags(self, name=None) -> List['Tag']:
         return super().get_tags(name)[1:]
 
     @property
-    def _content_span(self) -> Tuple[int, int]:
+    def _relative_content_span(self) -> Tuple[int, int]:
         s = self.string
         return s.find('>') + 1, s.rfind('<')

wikitextparser/_template.py

@@ -29,7 +29,7 @@ class Template(SubWikiTextWithArgs):
     _first_arg_sep = 124
 
     @property
-    def _content_span(self) -> Tuple[int, int]:
+    def _relative_content_span(self) -> Tuple[int, int]:
         return 2, -2
 
     def normal_name(

wikitextparser/_wikilink.py

@@ -22,7 +22,7 @@ class WikiLink(SubWikiText):
     __slots__ = '_cached_match'
 
     @property
-    def _content_span(self) -> Tuple[int, int]:
+    def _relative_content_span(self) -> Tuple[int, int]:
         s = self.string
         f = s.find
         rf = s.rfind