chore(_balanced_quotes_shadow): rewrite to return spans

This branch was intended to improves bolds/italics performance (#132),
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