1 files changed, 1 insertions, 75 deletions
diff --git a/sphinx/websupport/storage/differ.py b/sphinx/websupport/storage/differ.py
index 2f185d7eb..449d038da 100644
--- a/sphinx/websupport/storage/differ.py
+++ b/sphinx/websupport/storage/differ.py
@@ -9,78 +9,4 @@
     :license: BSD, see LICENSE for details.
 """
 
-import re
-from difflib import Differ
-
-from sphinx.util.pycompat import htmlescape
-
-
-class CombinedHtmlDiff(object):
-    """Create an HTML representation of the differences between two pieces
-    of text.
-    """
-    highlight_regex = re.compile(r'([\+\-\^]+)')
-
-    def __init__(self, source, proposal):
-        proposal = htmlescape(proposal)
-
-        differ = Differ()
-        self.diff = list(differ.compare(source.splitlines(1),
-                                        proposal.splitlines(1)))
-
-    def make_text(self):
-        return '\n'.join(self.diff)
-
-    def make_html(self):
-        """Return the HTML representation of the differences between
-        `source` and `proposal`.
-
-        :param source: the original text
-        :param proposal: the proposed text
-        """
-        html = []
-        diff = self.diff[:]
-        line = diff.pop(0)
-        next = diff.pop(0)
-        while True:
-            html.append(self._handle_line(line, next))
-            line = next
-            try:
-                next = diff.pop(0)
-            except IndexError:
-                html.append(self._handle_line(line))
-                break
-        return ''.join(html).rstrip()
-
-    def _handle_line(self, line, next=None):
-        """Handle an individual line in a diff."""
-        prefix = line[0]
-        text = line[2:]
-
-        if prefix == ' ':
-            return text
-        elif prefix == '?':
-            return ''
-
-        if next is not None and next[0] == '?':
-            tag = prefix == '+' and 'ins' or 'del'
-            text = self._highlight_text(text, next, tag)
-        css_class = prefix == '+' and 'prop-added' or 'prop-removed'
-
-        return '<span class="%s">%s</span>\n' % (css_class, text.rstrip())
-
-    def _highlight_text(self, text, next, tag):
-        """Highlight the specific changes made to a line by adding
-        <ins> and <del> tags.
-        """
-        next = next[2:]
-        new_text = []
-        start = 0
-        for match in self.highlight_regex.finditer(next):
-            new_text.append(text[start:match.start()])
-            new_text.append('<%s>' % tag)
-            new_text.append(text[match.start():match.end()])
-            new_text.append('</%s>' % tag)
-            start = match.end()
-        new_text.append(text[start:])
-        return ''.join(new_text)
+from sphinxcontrib.websupport.storage.differ import CombinedHtmlDiff  # NOQA